NON-SLIP BOARD AND PRODUCTION PROCESS THEREOF

Abstract

The present application provides a non-slip board, relating to a technical field of non-slip materials, and aims at solving the problem that after long-term use, the flooring and the sound insulating pad have problems such as deformation, corner warping and the like due to expansion and contraction, which also causes displacement on the base surface. The present application further provides a production process of the non-slip board, in which the non-slip coating layer is applied to a sound insulating pad, a soft resilient floor board, a coiled material, a homogeneous coiled material or a hard floor board, and the sound insulating pad, the coiled material or the hard floor board is not prone to displacement after being laid onto the foundation ground.

Claims

1. A non-slip board, comprising a board layer and a non-slip coating layer on one surface of the board layer, wherein the non-slip coating layer is formed by applying a coating prepared by the following steps: weighing: weighing, in percentage by mass, 35-40% of a comonomer, 9-10% of styrene, 0.3-0.5% of acrylic acid, 0.7-1.3% of a compound emulsifier prepared by mixing sodium nonylphenol polyoxyethylene ether sulfate and allyl polyoxyethylene ether in a mass ratio of (3-7):(7-3), 0.1-0.2% of sodium bicarbonate, 49-54% of deionized water, 0.15-0.25% of an ammonium persulfate initiator, and 0.25-0.5% of additional auxiliary; core emulsion preparation: adding - of total of the compound emulsifier, all the sodium bicarbonate and half of the deionized water into a stirring device, performing stirring for 10-15 min with a revolving speed of 300-400 r/min, and heating to 45-50 C.; then, adding - of the comonomer and - of the styrene, carrying out pre-emulsification for 10-15 min, thereafter, heating to 80-90 C., and then adding half of the ammonium persulfate initiator to obtain a core emulsion; pre-emulsification: adding the other half of the deionized water into the remaining compound emulsifier, carrying out dispersion for 10-15 min at a temperature of 30-40 C. with a revolving speed of 300-400 r/min, and adding the remaining comonomer, the remaining styrene and all the acrylic acid to obtain a pre-emulsion; and coating preparation: adding the pre-emulsion into the core emulsion by at least three times together with the remaining ammonium persulfate initiator uniformly divided into corresponding parts for each time, adding the additional auxiliary, thereafter, performing stirring for 10-15 min, heating to 80-90 C. and maintaining the heating temperature for 30-40 min; cooling to 30-40 C., and adjusting pH of a system to 7 to obtain the coating.

2. The non-slip board according to claim 1, wherein the comonomer is any one selected from a group consisting of n-butyl acrylate, butyl methacrylate and isooctyl acrylate; and the additional auxiliary consists of the following components in percentage by mass: 13-30% of an preservative, and 70-87% of a penetrant.

3. The non-slip board according to claim 1, wherein the board layer is any one selected from a group comprising a sound insulating pad, a soft resilient floor board, a coiled material, a homogeneous coiled material, and a hard floor board.

4. The non-slip board according to claim 3, wherein the board layer is a sound insulating pad, and a flooring layer is arranged on one side, away from the non-slip coating layer, of the sound insulating pad.

5. The non-slip board according to claim 3, wherein the board layer is a hard floor board, and one side of the hard floor board is provided with a first protrusion, while a side, opposite to the first protrusion, of the hard floor board is provided with a first regular groove for the first protrusion of an adjacent hard floor board to fit into.

6. The non-slip board according to claim 5, wherein a side, adjacent to the first protrusion, of the hard floor board is provided with a second protrusion, while a side, opposite to the second protrusion, of the hard floor board is provided with a second regular groove for the second protrusion of an adjacent hard floor board to fit into, and the second regular groove is in communication with the first regular groove.

7. The non-slip board according to claim 3, wherein the board layer is a coiled material, and the coiled material comprises a middle material layer, a PVC pattern layer, a PVC wear-resistant layer and a UV cured layer which are sequentially arranged from bottom to top.

8. The non-slip board according to claim 7, wherein a glass fiber layer is arranged between the middle material layer and the PVC pattern layer.

9. A production process of the non-slip board according to claim 1, comprising the following steps: spraying: spraying a coating onto one surface of a board layer to obtain a non-slip coating layer with a thickness of 0.1-0.2 mm; and drying: drying the board layer with the non-slip coating layer naturally or in an oven tunnel at a temperature of 70-100 C. for 24 h.

10. The production process of the non-slip board according to claim 9, wherein the board layer is a sound insulating pad, and after drying, the production process further comprises the following steps: pasting a clamping part made of transparent PVC to an edge of the non-slip coating layer of the sound insulating pad, and then laying a release paper so that the clamping part is between the release paper and the non-slip coating layer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0044] FIG. 1 is a schematic view showing an overall structure of Embodiment 7 of the present application;

[0045] FIG. 2 is a schematic view showing an overall structure of Embodiment 12 of the present application;

[0046] FIG. 3 is a schematic view showing a structure of Embodiment 14 of the present application;

[0047] FIG. 4 is a schematic view showing a structure of a hard floor board with interlocking arrangement according to Embodiment 15 of the present application;

[0048] FIG. 5 is a schematic view showing a structure of a hard floor board with insert lock arrangement according to Embodiment 16 of the present application;

[0049] FIG. 6 is a schematic view showing an assembled structure of hard floor boards with insert lock arrangement according to Embodiment 16 of the present application; and

[0050] FIG. 7 is a schematic view showing an assembled structure of hard floor boards according to Embodiment 17 of the present application.

[0051] In the drawings: [0052] 1. hard floor board [0053] 2. first protrusion [0054] 21. first regular groove [0055] 3. coiled material [0056] 31. middle material layer [0057] 32. glass fiber layer [0058] 33. PVC pattern layer [0059] 34. PVC wear-resistant layer [0060] 35. UV cured layer [0061] 4. non-slip coating layer [0062] 5. sound insulating pad [0063] 51. release paper [0064] 52. flooring layer [0065] 53. clamping part [0066] 6. second protrusion [0067] 61. Second regular groove

DETAILED DESCRIPTION OF THE INVENTION

[0068] The present application will now be explained in further detail with reference to the accompanying drawings.

[0069] The present application provides a non-slip board, including a board layer and a non-slip coating layer on one surface of the board layer, in which the board layer is any one selected from a group consisting of a sound insulating pad, a soft resilient floor board, a coiled material, a homogeneous coiled material and a hard floor board. The non-slip coating includes a comonomer, styrene, acrylic acid, a compound emulsifier, an initiator, sodium bicarbonate, additional auxiliary and deionized water.

[0070] In some embodiments, n-butyl acrylate was used as the comonomer; 25 wt % ammonia water was used for adjusting the pH of the system; sodium bicarbonate was commercially available industrial grade sodium bicarbonate; 4,5-dichloro-2-octyl-isothiazolone (commonly called DCOIT), purchased from Foshan Lanfeng Auxiliaries Co., Ltd. and having a strong killing effect on most of bacteria and capable of inhibiting reproduction of bacteria, was used as the preservative; and sodium dioctyl sulfosuccinate (commonly called Fast T), which was purchased from Jiangsu Haian Petroleum Chemical Factory, was used as the penetrant.

[0071] For the purpose of making use of the feature that a charge stabilization effect of an anionic emulsifier and a steric hindrance effect of a nonionic emulsifier may generate a synergistic effect, a composite system consisting of sodium nonylphenol polyoxyethylene ether sulfate (anionic emulsifier) and allyl polyoxyethylene ether (nonionic emulsifier) was selected as the emulsifier in one embodiment of the present application.

[0072] The non-slip coating was prepared by core-shell copolymerization, during which core-shell copolymerization was carried out with styrene as a hard monomer, n-butyl acrylate as a soft monomer and acrylic acid as a crosslinking monomer, thereby obtaining a coating with high resilience and high strength. The original central shell adsorbed the crosslinking monomer to the surface or interior of a latex particle through self-emulsification under the action of the initiator, and then polymerization reaction was initiated. Long chains spread uniformly when the aqueous coating is coated on a surface of an object, in which the hard monomer can improve the structural strength, the load bearing capacity and pressure bearing capacity, and the soft monomer can improve the flexibility of the whole system, thus finally the non-slip coating layer achieves better mechanical properties. Meanwhile, the acrylic monomer can improve the adhesion and the wettability of the latex film and increase the stability of the emulsion.

Examples 1-4

[0073] According to the mass ratio, the contents of the components are shown in the following table:

TABLE-US-00001 TABLE 1 Contents of Components of Coatings in Examples 1-4 Component Example 1 Example 2 Example 3 Example 4 n-butyl acrylate 376.5 kg 350 kg 379.7 kg 400 kg styrene 100 kg 90 kg 95 kg 90 kg acrylic acid 5 kg 3 kg 4 kg 3 kg sodium nonylphenol 3.9 kg 3.5 kg 7 kg 3.5 kg polyoxyethylene ether sulfate allyl polyoxyethylene 9.1 kg 3.5 kg 3 kg 3.5 kg ether ammonium persulfate 2.5 kg 1.5 kg 2 kg 1.5 kg initiator sodium bicarbonate 2 kg 1 kg 1.5 kg 1 kg 25 wt. % ammonia water 6 kg 4 kg 5 kg 4 kg DCOIT 1 kg 0.5 kg 0.8 kg 0.5 kg Fast T 4 kg 3 kg 2 kg 3 kg deionized water 490 kg 540 kg 500 kg 490 kg

[0074] The coatings in Examples 1-4 were prepared by a same preparation method, and taking Example 4 as an example, the preparation method specifically includes the following steps that:

[0075] weighing: 400 kg of n-butyl acrylate, 90 kg of styrene, 3 kg of acrylic acid, 7 kg of an emulsifier, 1 kg of sodium bicarbonate, 490 kg of deionized water and 1.5 kg of ammonium persulfate were weighed according to the contents listed in table 1;

[0076] core emulsion preparation: 4.5 kg of the compound emulsifier prepared by mixing, 1 kg of sodium bicarbonate and 245 kg of deionized water were added into a stirring device, stirring was performed for 10 min with a revolving speed of 300 r/min, and the temperature was heated to 45 C.; then, 160 kg of n-butyl acrylate and 54 kg of styrene were added, pre-emulsification was carried out for 10 min, thereafter, the temperature was heated to 80 C., and then 0.75 kg of the ammonium persulfate initiator was added to obtain the core emulsion;

[0077] pre-emulsification: the remaining 245 kg of deionized water was added into the remaining 2.5 kg of compound emulsifier, dispersion was carried out for 10 min at a temperature of 30 C. with a revolving speed 300 r/min, and the remaining 240 kg of n-butyl acrylate, the remaining 36 kg of styrene and all 3 kg of acrylic acid were added to obtain a pre-emulsion;

[0078] coating preparation: the pre-emulsion was added into the core emulsion by at least three times together with 0.25 kg of the initiator added for each time, DCOIT in a total amount of 0.5 kg and Fast T in a total amount of 3 kg were added, thereafter, stirring was performed for 10 min, the temperature was heated to 80 C. and maintained for 30 min, the temperature decreased to 30 C., and ammonia water was dripped until a system pH value of 7 to obtain the coating; and

[0079] spraying: the obtained coating was sprayed onto one surface of a corresponding board layer to obtain a non-slip coating layer with a thickness of 0.2 mm.

[0080] In polymerization of an emulsion, the selection and amount of the emulsifier are crucial to the stability and particle size of the emulsion. On the premise of maintaining the characteristics of the emulsion, it is important to select appropriate contents for the emulsifier in order to improve the stability of the polymer emulsion and reduce the particle size of the emulsion.

[0081] On the basis of Example 2, Control groups A-C differed from Example 2 in that, 2.5 kg of sodium nonylphenol polyoxyethylene ether sulfate and 2.5 kg of allyl polyoxyethylene ether were used in Control group A; 5 kg of sodium nonylphenol polyoxyethylene ether sulfate and 5 kg of allyl polyoxyethylene ether were used in Control group B; and 7 kg of sodium nonylphenol polyoxyethylene ether sulfate and 7 kg of allyl polyoxyethylene ether were used in Control group C.

TABLE-US-00002 TABLE 2 Influence of Use Amount of Emulsifier on Properties of the Coating Control group A Example 2 Control group B Control group C Stability of calcium ion No Yes Yes No Appearance of Milky white, no Milky white, Milky white, Weak blue light emulsion blue light fine, strong fine, strong blue light blue light

[0082] Compared with example 2, the amount of the emulsifier was reduced in Control group A, so that the stability of calcium ions in the emulsion is low, and the emulsion was less glossy. This is because the surfaces of ions in the emulsion are not completely covered by the emulsifier molecules when the emulsifier is insufficient, so that the charge density on the surfaces of ions in the emulsion is reduced. As the amount of the emulsifier increases, for example, in Example 2 and Control group B, more latex is produced, the stability of the polymerization process is increased, and the rate of emulsion polymerization is increased, providing a glossy emulsion.

[0083] Compared with example 2 and Control group B, a large amount of the emulsifier was used in Control group C and the water resistance of the coating film was reduced. This is because, on one hand, the emulsifier is difficult to volatilize when the emulsion is dried to form a film, and the emulsifier is hydrophilic, so that the water resistance of the emulsion film is reduced, and a contact angle of water on the emulsion film is reduced; and, on the other hand, the number of the lipophilic end groups of the emulsifier attached to the macromolecular chain is increased, and the obstruction to chain segment coalescence is increased, so that film forming capability is reduced, and the water resistance is reduced.

[0084] The content of the emulsifier is controlled in a range of 0.7-1.3% to improve the wear resistance, pressure resistance, compactness and impermeability of the non-slip coating layer. Due to the good water resistance of the non-slip coating layer, the board layer is not prone to deformation and warping by absorbing vapor of underground water, so that the product is prevented from deformation and warping.

[0085] The type of the initiator also influences the stability of the emulsion.

[0086] On the basis of Example 3, Control groups 1-2 differ from Example 3 in that, the initiator in Control group 1 was potassium persulfate with an amount of 2 kg; and the initiator in Control group 2 was a mixture of potassium persulfate and sodium bisulfite in a mass ratio of 1:1 with a total amount of 2 kg.

TABLE-US-00003 TABLE 3 Influence of Type of Initiator on Properties of Coating Conversion rate of Initiator monomer % Aggregate Appearance Gloss Control group 1 95.8 More White 85 Example 3 97.8 None Blue light, 107 milky white Control group 2 98.2 None Blue light, 120 milky white

[0087] As can be seen from Table 3, either using potassium persulfate-sodium bisulfite as the initiator or using ammonium persulfate as the initiator was better than using potassium persulfate alone. Aggregates were generated in the process of polymerization when potassium persulfate was used as the initiator, whereas, when potassium persulfate-sodium bisulfite or ammonium persulfate was used as the initiator, the polymerization process was stable with substantially no aggregate generated, and the composite latex particles had a small particle size and a narrow distribution in particle size.

ExampleS 5-6

[0088] On the basis of Example 3, Examples 5-6 differ from Example 3 in that, 5 kg of acrylic acid was used in Example 5, 3 kg of acrylic acid was used in Example 6, and 0 kg of acrylic acid was used in a blank control group.

TABLE-US-00004 TABLE 4 Influence of Amount of Acrylic Acid on Properties of Coating and Coating Film Amount of Acrylic Stickness/ Adhesion/ Flexibility/ Water acid/g (mPa .Math. s) level mm absorption/% Blank control group 70.0 3 1 1.8 Example 3 140.2 1 2 5.7 Example 5 150.8 1 2 10.8 Example 6 120.5 1 2 2.1

[0089] As can be seen from the above table, with the increase in the amount of acrylic acid, both the stickness and water absorption of the coating were increased. The reason might be that acrylic acid is a hydrophilic monomer, and the water absorption is increased by using it in a large amount.

Example 7

[0090] Referring to FIG. 1, a sound insulating pad with a non-slip coating layer containing the coating prepared in Example 4 was prepared as follows:

[0091] spraying: the coating prepared in Example 4 was sprayed onto a bottom surface of a sound insulating pad 5 to obtain a non-slip coating layer 4 with a thickness of 0.2 mm;

[0092] drying: the sound insulating pad 5 with the non-slip coating layer 4 was dried in an oven tunnel at a temperature of 70 C. for 24 h; and

[0093] after drying, a clamping part 53 made from transparent PVC was bonded to an edge of the non-slip coating layer 4 of the sound insulating pad 5, and then a piece of release paper 51 was laid so that the clamping part 53 was between the release paper 51 and the non-slip coating layer 4. The clamping part 53 facilitated removal of the release paper 51 in later use. The release paper 51 was formed by coating silicone oil, and after the silicone oil is dried into shape, the surface of the release paper 51 was smooth and non-stick to glue.

[0094] In this Example, the sound insulating pad 5 was an EVA foam sound insulating pad.

Example 8

[0095] This example provided a sound insulating pad with a non-slip coating layer which was based on example 7 and differed from example 7 in that: the sound insulating pad 5 was an IXPE foam sound insulating pad. The IXPE foam sound insulating pad had a smooth surface and uniform and dense foam cells, so that uneven distribution of moisture caused by nonuniform foam cells was prevented when moisture diffused, thereby preventing the sound insulating pad 5 from arching to a certain extent.

Example 9

[0096] This example provided a sound insulating pad with a non-slip coating layer which was based on example 7 and differed from example 7 in that: the sound insulating pad 5 was a PVC sound insulating pad.

Example 10

[0097] This example provided a sound insulating pad with a non-slip coating layer which was based on example 7 and differed from example 7 in that: the sound insulating pad 5 was a non-woven fabric sound insulating pad.

Example 11

[0098] This example provided a sound insulating pad with a non-slip coating layer which was based on example 7 and differed from example 7 in that: the sound insulating pad 5 was a fiber felt sound insulating pad.

[0099] Friction coefficients of sound insulating pads with the non-slip coating layers of Examples 7-11 were measured in accordance with the provisions of ISO 8295-1995, while the friction coefficients of sound insulating pads without non-slip coating layers compared with Examples 7-11 were measured as comparison.

TABLE-US-00005 TABLE 5 Friction Coefficients of sound insulating pads with and without Non-slip Coating Layers Static Kinetic friction friction coefficient coefficient Example 7 0.734 0.537 EVA foam sound insulating pad without non-slip 0.417 0.324 coating layer compared with Example 7 Example 8 0.965 0.648 IXPE foam sound insulating pad without non-slip 0.521 0.316 coating layer compared with Example 8 Example 9 0.756 0.623 PVC sound insulating pad without non-slip 0.502 0.439 coating layer compared with Example 9 Example 10 0.787 0.523 Non-woven fabric sound insulating pad without 0.398 0.295 non-slip coating layer compared with Example 10 Example 11 0.765 0.586 Fiber felt sound insulating pad without non-slip 0.512 0.423 coating layer compared with Example 11

[0100] As can be seen from the above table, the sound insulating pads with the non-slip coating layers had larger static and kinetic friction coefficients and better non-slip performance compared with the sound insulating pads without the non-slip coating layers. When the product was laid onto the foundation ground, the release paper was peeled off, and the non-slip coating layer was attached to the surface of the foundation ground, so that the product was not prone to displacement, thereby improving the stability of paving.

[0101] The tensile strength and elongation at break of the sound insulating pads with the non-slip coating layers in Examples 7-11 were measured according to GB/T528. The non-slip boards were made into dumbbell-shaped samples, the samples of the non-slip boards in Examples 7-11 were uniformly arranged on upper and lower holders of a tensile tester, and the moving speed of the holders was adjusted to (50050) mm/min.

[0102] The compression set of sound insulating pads with the non-slip coating layers of Examples 7-11 were measured according to GB/T7759. The non-slip boards were made into samples having a diameter of (290.5) mm and a height of (12.50.5) mm, and a compression rate of 25% was selected to carry out compression set tests.

TABLE-US-00006 TABLE 6 Performance Test Results of Examples 7-11 Tensile Compression strength/ Elongation Appearance set/% MPa at break/% of Products Example 42 1.5 150 Smooth surface, no 7 warping, no cracking Example 43 1.4 151 Smooth surface, no 8 warping, no cracking Example 49 1.2 149 Smooth surface, no 9 warping, no cracking Example 50 1.3 148 Smooth surface, no 10 warping, no cracking Example 48 1.2 149 Smooth surface, no 11 warping, no cracking

[0103] As can be seen from the above table, the sound insulating pads with the non-slip coating layers had excellent resilience and strength and a smooth surface without warping or cracking.

Example 12

[0104] Referring to FIG. 2, a sound insulating pad with a flooring bonded to the top and a non-slip coating layer applied to the bottom, which adopted the coating prepared in Examples 4, was prepared as follows:

[0105] Step 1: a bonding layer was applied to a top surface of a sound insulating pad 5, in which an acrylic adhesive being Ailete 221AB adhesive-Ailete 221 epoxy adhesive purchased from Ailete Corporation was adopted as the bonding layer;

[0106] Step 2: the sound insulating pad 5 with the adhesive layer prepared in Step 1 was bonded to a flooring layer 52;

[0107] Step 3: the coating prepared in example 4 was applied to a bottom surface of the sound insulating pad 5 by roll coating to obtain the non-slip coating layer 4 with a thickness of 0.2 mm;

[0108] Step 4: the sound insulating pad 5 with the non-slip coating layer 4 was dried in an oven tunnel at a temperature of 85 C. for 24 h; and

[0109] Step 5: after drying, a piece of release paper 51 was laid onto the non-slip coating layer 4 of the sound insulating pad 5.

[0110] In this example, the composite flooring layer 52 was any one selected from a group consisting of a soft resilient floor board, a hard floor board, a solid wood floor board and a mineral floor board, and the floor board provided a non-slip property as well as a good sound insulating effect after being bonded. The flooring layer 52, the sound insulating pad 5 and the ground were tightly connected into a whole under the action of the adhesive, so that the flooring layer 52 was effectively prevented from deformation and arching.

Example 13

[0111] A soft resilient floor board with a non-slip coating layer, which adopted the coating prepared in example 4, was prepared as follows:

[0112] spraying: the coating prepared in Example 4 was sprayed onto a bottom surface of a soft resilient floor board to obtain a non-slip coating layer with a thickness of 0.1 mm; and

[0113] drying: the soft resilient floor board with the non-slip coating layer was dried in an oven tunnel at a temperature of 85 C. for 24 h.

Example 14

[0114] Referring to FIG. 3, a coiled material with a non-slip coating layer, which includes a middle material layer 31, a glass fiber layer 32, a PVC pattern layer 33, a PVC wear-resistant layer 34, and a UV cured layer 35 arranged sequentially from bottom to top and adopts the coating prepared in Example 4, was prepared as follows:

[0115] Step 1: a chopped glass fiber was added into the middle material layer 31 to form the glass fiber layer 32, and the PVC wear-resistant layer 34, the PVC pattern layer 33, the glass fiber layer 32 and the middle material layer 31 were subjected to hot-pressing bonding treatment at a treatment temperature of 120 C. for 50 min under a pressure of 12 mpa;

[0116] chopped glass fiber had good stability, which was capable of restraining the coiled material in the plane to a certain extent, thereby preventing arching; and natural stone-powder was added into the glass fiber layer 32, so that the strength was increased;

[0117] Step 2: UV treatment was carried out, in which an epoxy acrylic UV coating was applied to a top surface of the PVC wear-resistant layer 34, and a UV cured layer 35 was formed after UV curing;

[0118] the epoxy acrylic UV coating was purchased from Hengxing Co., Ltd. and Akzo Nobel N.V.;

[0119] Step 3: the coating prepared in example 4 was sprayed onto a bottom surface of the coiled material 3 to obtain the non-slip coating layer 4 with a thickness of 0.1 mm; and

[0120] Step 4: the coiled material 3 with the non-slip coating layer 4 was dried in an oven tunnel at a temperature of 85 C. for 24 h.

[0121] In this example, the coiled material 3 was a PVC coiled material, and the middle material layer 31 was a PVC middle material layer.

[0122] Further, the coiled material was not limited to the PVC coiled material, while a homogeneous rubber coiled material, a homogeneous EVA coiled material and the like can also be used.

[0123] Part of performance parameters of the PVC coiled material with the non-slip coating layer in example 14 were measured.

[0124] Shrinkage: measured with a precision high-temperature oven tester HQ-WG-550; and

[0125] Hardness: measured with a Shore hardness tester SLX-D.

TABLE-US-00007 TABLE 7 Performance Comparison of Coiled material added with and without Glass Fiber Layer Shrinkage Hardness Without glass fiber layer 0.1% 65HD Example 14 0.06% 70HA

[0126] As can be seen from Table 7, the use of the glass fiber layer led to great reduction in shrinkage, reduction in hardness and obviously improvement in flexibility of the coiled material, so that the phenomenon of warping of the product was reduced, improving the performance of the product.

Example 15

[0127] Referring to FIG. 4, a hard floor board with a non-slip coating layer was provided, in which the hard floor board had a standard of thickness being 2-12 mm. In a table resilience test, a natural sagging height was L<500 mm.

[0128] The table resilience test included the following steps:

[0129] Step 1: a table was adjusted to be horizontal with a height of H0 (H0600 mm), a line was drawn at 400 mm from an edge of the table where one end of a test piece of the hard floor board was placed;

[0130] Step 2: a steel plate (450*450 mm) was used to press one end of the test piece on the table, while the other end of the test piece sags naturally, in which one side of the steel board was aligned with the edge of the table, and a 5 Kg weight was put on the steel board; and

[0131] Step 3: after the test piece was stabilized, the height from the ground to a lowest sagged end of the test piece was measured with a tape measure and recorded as H1. A sag distance of the test piece was L=H0-H1. If the natural sagging height L<500 mm, the test piece was a hard floor board.

[0132] The hard floor board 1 with the non-slip coating layer, which adopted the coating prepared in Example 4, was prepared as follows:

[0133] spraying: the coating prepared in Example 4 was sprayed onto a bottom surface of a hard floor board 1 to obtain a non-slip coating layer 4, in which the non-slip coating layer 4 had a thickness of 0.1 mm, and in this example, the hard floor board 1 had a thickness of 2 mm; and

[0134] drying: the hard floor board 1 with the non-slip coating layer 4 was dried in an oven tunnel at a temperature of 85 C. for 24 h.

[0135] In this example, the hard floor board 1 was a hard PVC floor board, and a first protrusion 2 was integrally formed on one side of the hard floor board 1, while a first regular groove 21 was formed in another side of the hard floor board 1. The first protrusion 2 was hook-shaped, and in assembly of the hard floor boards 1, left and right adjacent hard floor boards 1 were connected with each other through the fit connection of the first protrusion 2 with the first regular groove 21, so that the paving stability was improved, the occurrence of edge warping and arching of the hard floor boards 1 was reduced, and the floor board was not prone to displacement.

Example 16

[0136] Referring to FIGS. 5 and 6, a hard floor board with a non-slip coating layer, which adopted the coating prepared in Example 4, was prepared as follows:

[0137] spraying: the coating prepared in Example 4 was sprayed onto the bottom of a hard floor board 1 to obtain a non-slip coating layer 4, in which the non-slip coating layer 4 had a thickness of 0.1 mm, and the hard floor board 1 had a thickness of 2.5 mm; and

[0138] drying: the hard floor board with the non-slip coating layer 4 was dried in an oven tunnel at a temperature of 85 C. for 24 h.

[0139] In this example, the hard floor board 1 was a hard solid wood floor board, and a first protrusion 2 was connected to one side of the hard floor board 1, while a first regular groove 21 was formed in another side of the hard floor board 1. During assembling the hard floor boards 1, adjacent left and right hard floor boards 1 were connected with each other through the fit connection of the first protrusion 2 with the first regular groove 21. A second protrusion 6 was integrally formed on one side of the hard floor board 1 adjacent to the side where the first protrusion 2 was located. A second regular groove 61 was formed in the back of the hard floor board 1 and was in communication with the first regular groove 21. Adjacent front and rear hard floor boards 1 were connected with each other through the fit connection of the second protrusion 2 with the second regular groove 61, so that the paving stability of the hard floor boards 1 was improved, the occurrence of edge warping and arching was reduced, and the floor board was not prone to displacement.

Example 17

[0140] Referring to FIG. 7, a hard floor board with a non-slip coating layer, which adopted the coating prepared in example 4, was prepared as follows:

[0141] spraying: the coating prepared in example 4 was sprayed onto the bottom of a hard floor board 1 to obtain a non-slip coating layer 4, in which the non-slip coating layer 4 had a thickness of 0.1 mm, and the hard floor board 1 had a thickness of 2 mm; and

[0142] drying: the soft hard floor board with the non-slip coating layer was dried in an oven tunnel at a temperature of 85 C. for 24 h.

[0143] In this example, the hard floor board 1 was a hard PVC floor board, and a first protrusion 2 was connected to one side of the hard floor board 1, while a first regular groove 21 was formed in another side of the hard floor board 1. The section of the first regular groove 21 was V-shaped. Through the fit connection of the first strip 2 with the regular groove 21, two adjacent hard floor boards 1 can be spliced together without the need for lock arrangement, this was because it has been ensured that the floor board cannot slip due to the non-slip coating layer 4. The difference between heights of adjacent hard floor boards 1 can be controlled by the first protrusion 2, so that the hard floor boards 1 were flat and not prone to warping after being paved.

[0144] The hard floor boards with the non-slip coating layers in examples 20-22 were tested for static bending strength, thickness swelling rate of water absorption and warpage according to the provisions of GB/T11718-2009, GB/T18102-2007 and EN 434, and the records were shown in Table 8.

TABLE-US-00008 TABLE 8 Performance Results of Floor Boards with Non-slip Coating Layers of examples 15-17 Thickness swelling rate Static bending of water strength/MPa absorption/% Warpage/mm Example 15 27.2 0.12 0.6 Example 16 28.3 0.13 0.5 Example 17 27.0 0.12 0.5 Standard GB/T11718- GB/T18102- EN434 2.0 2009, 27.0 2007, 18 (1.5-3 mm)

[0145] As can be seen from Table 8, the above hard floor board had good resilience and strength, and good mechanical properties. Due to the high resilience and high strength of the product obtained by virtue of the non-slip coating layer, the product was endowed with good flexibility, so that even if the base surface to be paved had pits, the product can be attached to the base surface with the flexibility of the coating layer. In addition, as the coating had high adhesion and high water resistance, the hard floor board was improved in wear resistance, pressure resistance, compactness and impermeability, and was not prone to deformation and warping by absorption of water, so that the displacement was reduced.

[0146] The embodiments of the present application are all preferred embodiments of the application, and are not intended to limit the scope of the application. Accordingly, any equivalent variations made based on the shape, structure and principles of present application are intended to be included within the scope of the present application.