CO-EXTRUSION SPC FOAM FLOORING AND MANUFACTURING METHOD THEREOF

Abstract

A foam flooring includes a stone-plastic base material structure, which sequentially comprises, from top to bottom, a first stable layer, a foaming layer and a second stable layer. The first stable layer and the second stable layer are both sheets with a PVC resin and filler powder as main components, with 25-40 parts by mass of the PVC resin and 55-75 parts by mass of the filler powder; and the density of the SPC foam flooring is 1.4-1.6 g/cm3. The foaming layer is arranged between the two stable layers, such that the overall density of the flooring is significantly reduced and reaches 1.4-1.6 g/m3; since the foaming layer is arranged inside, the surface strength of the overall flooring is not influenced.

Claims

1. A flooring, comprising a base material structure, as well as a decorative and a protective structure; wherein said decorative and protective structure sequentially comprises, from top to bottom, a UV coating, a wear-resistant layer and a decorative layer, wherein said wear-resistant layer comprises a PVC resin as a main component, and further comprises at least an amount of plasticizer and wherein said decorative layer is a PVC film with a surface pattern; wherein said base material structure comprises at least a stable layer and a foaming layer; wherein said stable layer is a sheet with a PVC resin and filler powder as main components, wherein the amount of the PVC resin is 100 parts by weight and the filler powder forms at least 250 parts by weight; wherein said foaming layer is a chemical foaming layer comprising 100 parts by weight of PVC resin powder and at least 150 parts by weight of filler powder.

2. The flooring of claim 1, wherein said foaming layer further comprises at least 4 parts by weight of calcium zinc stabilizer.

3. The flooring of claim 2, wherein said foaming layer further comprises at least 0.6 parts by weight of a foaming agent.

4. The flooring of claim 1, wherein said decorative layer is laminated to said stable layer.

5. The flooring of claim 4, wherein said base material structure at a surface opposite said decorative layer comprises a background pattern.

6. The flooring of claim 1, wherein said base material structure comprises from top to bottom a first stable layer, said foam layer and said stable layer forming a second stable layer.

7. The flooring of claim 6, wherein said first stable layer is a sheet with a PVC resin and filler powder as main components, wherein the amount of the PVC resin is 100 parts by weight and the filler powder forms at least 250 parts by weight.

8. The flooring of claim 1, wherein said filler powder is or comprises calcium carbonate.

9. The flooring of claim 1, wherein said foaming layer comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin powder, 150 to 200 parts of calcium carbonate, 4 to 7 parts of a calcium zinc stabilizer, 0.6 to 1.2 parts of a foaming agent, 0.5 to 0.9 parts of polyethylene wax, 2 to 3 parts of chlorinated polyvinyl chloride, 2 to 3 parts of acrylate, 0.3 to 0.8 parts of a lubricant, and 6 to 9 parts of a foaming regulator.

10. The flooring of claim 1, wherein said flooring has a density in the range of 1.4 to 1.6 g/cm.sup.3.

11. The flooring of claim 1, wherein the thickness of said foaming layer is in the range of 2 to 10 mm.

12. The flooring of claim 11, wherein the thickness of said stable layer is lower than said thickness of said foaming layer.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0030] FIG. 1 shows a schematic diagram indicating the structure of the present invention;

[0031] FIG. 2 is a schematic diagram indicating the device of the present invention;

[0032] FIG. 3 is a schematic diagram indicating the device according to Example 1 of the present invention; wherein, 1UV coating, 2wearresistant layer, 3decorative layer, 4first stable layer, 5foaming layer, 6second stable layer, 10background pattern roller, 20first mirror finish roller; 30second mirror finish roller, 40embossing roller, 200the servo feeding roller for the wearresistant layer, 300the servo feeding roller for the decorative layer, 400air release roller.

MOST PREFERRED EMBODIMENT FOR CARRYING OUT THE INVENTION

[0033] As shown in FIG. 1, a co-extrusion SPC foam flooring comprises a decorative and protective structure and a stone-plastic base material structure.

[0034] The decorative and protective structure sequentially comprises, from top to bottom, a UV coating (1), a wear-resistant layer (2) and a decorative layer (3); the stone-plastic base material structure sequentially comprises, from top to bottom, a first stable layer (4), a foaming layer (5), and a second stable layer (6). The density of the SPC foam flooring is 1.531 g/cm.sup.3.

[0035] In this Example, the thickness of the UV coating (1) is 100 ?m.

[0036] The wear-resistant layer (2) comprises a PVC resin as a main component and is obtained by the calendering process after the addition of suitable amounts of plasticizer, lubricant and stabilizer. Its thickness is 0.3 mm.

[0037] The decorative layer (3) is a PVC film with surface pattern. Its thickness is 0.07 mm.

[0038] The first stable layer (4) and the second stable layer (6) are both sheets with a PVC resin and filler powder as main components; wherein the amount of the PVC resin is 100 parts by weight, the filler powder is calcium carbonate with an amount of 250 parts by weight, and additives comprising the following components in parts by weight are added: [0039] 5 parts of a calcium zinc stabilizer [0040] part of an internal lubricant [0041] 1.4 parts of polyethylene wax [0042] 5 parts of chlorinated polyethylene [0043] 2 parts of acrylate [0044] parts of a composite lubricant [0045] 0.5 parts of a colorant

[0046] The aforesaid auxiliary agents are conventional auxiliary agents in the art, so there is no need to go into details.

[0047] The foaming layer (5) is a chemical foaming layer comprising the following components in parts by weight: [0048] 100 parts of PVC resin powder [0049] 160 parts of calcium carbonate [0050] 6 parts of a calcium zinc stabilizer [0051] 0.8 parts of a foaming agent [0052] 0.6 parts of polyethylene wax [0053] 2 parts of chlorinated polyvinyl chloride [0054] 2 parts of acrylate [0055] 0.5 parts of a lubricant [0056] 7 parts of a foaming regulator [0057] 0.5 part of a colorant

[0058] The aforesaid auxiliary agents are conventional auxiliary agents in the art, so there is no need to go into details.

[0059] As shown in FIG. 2, the method for preparing the SPC foam flooring of this Example is as follows: [0060] a. The raw materials for the first stable layer (4) and the second stable layer (6) are fed into the high-speed mixer, mixed and heated, cooled in the low-speed mixer, and are extruded from the extruder A; [0061] b. The raw materials for the foaming layer (5) are fed into the high-speed mixer, mixed and heated, cooled under low-speed stirring, introduced into the extruder B, subjected to melt plastification and are extruded from the extruder B; [0062] c. The extrudate of the extruder A is allowed to enter the mold flow channel distributor and converge with the extrudate of the extruder B at the die head, and the mixture is co-extruded through the die orifice of the die head to form the stone-plastic base material structure; [0063] d. The plate released from the mold is passed through an area between the background pattern roller (10) and the first mirror finish roller (20) to form the background pattern by compression, the stone-plastic base material structure is transferred to an area between the second mirror finish roller (30) and the embossing roller (40); the wear-resistant layer and the decorative paper are transferred by the servo feeding roller for the wear-resistant layer (200) and the servo feeding roller for the decorative layer (300) to an area between the second mirror finish roller (30) and the air release roller (400), and are subjected to pre-lamination; the wear-resistant layer and the decorative paper are laminated on the base material layer through the action of the second mirror finish roller (30) and the embossing roller (40) to form the wear-resistant layer and the decorative layer, as well as a surface pattern with concave and convex three-dimensional effect on the front face.

[0064] The properties comparison between the most preferred embodiment and conventional stone-plastic flooring (without foaming) is shown in the Table below.

TABLE-US-00001 Test results Co-extrusion ABA ABA foam stone-plastic Test stone-plastic flooring (most Test item standard flooring preferred embodiment) Dimensional ISO 0.13% 0.08% change rate 23999 after heating Curling after ISO 0.77 mm 0.30 mm heating 23999 Density ISO 1.984 g/cm.sup.3 1.531 g/cm.sup.3 23996

Embodiments of the Invention

[0065] As shown in FIG. 1, a co-extrusion SPC foam flooring comprises a decorative and protective structure and a stone-plastic base material structure.

[0066] The decorative and protective structure sequentially comprises, from top to bottom, a UV coating (1), a wear-resistant layer (2) and a decorative layer (3); the stone-plastic base material structure sequentially comprises, from top to bottom, a first stable layer (4), a foaming layer (5), and a second stable layer (6). The density of the SPC foam flooring is 1.465 g/cm.sup.3.

[0067] In this Example, the thickness of the UV coating (1) is 100 ?m.

[0068] The wear-resistant layer (2) comprises a PVC resin as a main component and is obtained by the calendering process after the addition of suitable amounts of plasticizer, lubricant and stabilizer. Its thickness is 0.3 mm.

[0069] The decorative layer (3) is a PVC film with surface pattern. Its thickness is 0.07 mm.

[0070] The first stable layer (4) and the second stable layer (6) are both sheets with a PVC resin and filler powder as main components; wherein the amount of the PVC resin is 100 parts by weight, the filler powder is calcium carbonate with an amount of 250 parts by weight, and additives comprising the following components in parts by weight are added: [0071] 5 parts of a calcium zinc stabilizer [0072] part of an internal lubricant [0073] 1.4 parts of polyethylene wax [0074] 5 parts of chlorinated polyethylene [0075] 2 parts of acrylate [0076] parts of a composite lubricant [0077] 0.5 parts of a colorant

[0078] The aforesaid auxiliary agents are conventional auxiliary agents in the art, so there is no need to go into details.

[0079] The foaming layer (5) is a physical foaming layer comprising the following components in parts by weight: [0080] 100 parts of polyvinyl chloride resin powder [0081] 330 parts of calcium carbonate [0082] 5.5 parts of a calcium zinc stabilizer [0083] part of an internal lubricant [0084] 1 parts of polyethylene wax [0085] 5.5 parts of chlorinated polyethylene [0086] 3 parts of acrylate [0087] parts of a composite lubricant

[0088] The aforesaid auxiliary agents are conventional auxiliary agents in the art, so there is no need to go into details.

[0089] As shown in FIG. 3, the method for preparing the SPC foam flooring of this Example is as follows: [0090] a. The raw materials for the first stable layer (4) and the second stable layer (6) are fed into the high-speed mixer, mixed and heated, cooled under low-speed stirring, and are extruded from the extruder A; [0091] b. The raw materials for the foaming layer (5) are fed into the high-speed mixer, introduced into the extruder B, mixed and heated, cooled under low-speed stirring, subjected to even melt plastification in the extruder B; 6 wt % liquefied high-pressure carbon dioxide is injected into the foaming agent injection device, a high pressure is maintained in the mold cavity to keep carbon dioxide in a liquid state so as to completely mix with the material, and the pressure is released during the course of extrusion; [0092] c. The extrudate of the extruder A is allowed to enter the mold flow channel distributor and converge with the extrudate of the extruder B at the die head, and the mixture is co-extruded through the die orifice of the die head to form the stone-plastic base material structure; [0093] d. The plate released from the mold is passed through an area between the background pattern roller (10) and the first mirror finish roller (20) to form the background pattern by compression, the stone-plastic base material structure is transferred to an area between the second mirror finish roller (30) and the embossing roller (40); the wear-resistant layer and the decorative paper are transferred by the servo feeding roller for the wear-resistant layer (200) and the servo feeding roller for the decorative layer (300) respectively to an area between the second mirror finish roller (30) and the air release roller (400), and are subjected to pre-lamination; the wear-resistant layer and the decorative paper are laminated on the base material layer through the action of the second mirror finish roller (30) and the embossing roller (40) to form the wear-resistant layer and the decorative layer, as well as a surface pattern with concave and convex three-dimensional effect on the front face.