WASTE-CLOTH-CONTAINING RECOVERED FIBER COATING SLURRY AND COATING, AND PREPARATION METHOD THEREOF

Abstract

The invention belongs to the technical field of waste cloth recovering and reusing, and particularly relates to waste-cloth-containing recovered fiber coating slurry and coating, and a preparation method thereof. 0.5-8 parts by weight of recovered fiber of waste cloth, 95-110 parts by weight of waterborne polyurethane, and 4-6 parts by weight of curing agent are prepared into recovered fiber coating slurry. The recovered fiber coating slurry is printed on a base cloth or a base plate, and dried to obtain a recovered fiber coating having a thickness of 0.1-1.0 mm. According to the technical solution provided by the invention, the field of physical method recycling of waste cloth is expanded to coating. Because the particle size of recovered fiber of the waste cloth is fine, the recovered fiber coating obtained by mixing waterborne polyurethane with a curing agent in a proper proportion has excellent abrasion resistance and mechanical properties.

Claims

1. A recovered fiber coating slurry containing waste cloth, characterized by comprising components as follows in parts by weight: 0.5-8 parts of recovered fiber of waste cloth, 95-110 parts of waterborne polyurethane, and 4-6 parts of curing agent.

2. The recovered fiber coating slurry containing waste cloth according to claim 1, characterized in that the waste cloth is one or more of chemical fiber, cotton, linen, silk, wool fabric, and blended cloth.

3. The recovered fiber coating slurry containing waste cloth according to claim 1, characterized in that the curing agent is isocyanate.

4. A preparation method for a recovered fiber coating containing waste cloth, characterized by comprising steps below: preparing recovered fiber: crushing waste cloth, and sieving to obtain recovered fiber, wherein the waste cloth is one or more of chemical fiber, cotton, linen, silk, wool fabric, and blended cloth; preparing recovered fiber coating slurry: uniformly mixing 0.5-8 parts by weight of the recovered fiber, 95-110 parts by weight of waterborne polyurethane, and 4-6 parts by weight of a curing agent to obtain recovered fiber coating slurry, wherein the curing agent is isocyanate; and printing: printing the recovered fiber coating slurry on a base cloth or a base plate, and drying to obtain a recovered fiber coating containing waste cloth.

5. The preparation method according to claim 4, characterized in that the waste cloth is crushed by adopting a fiber pulping machine, feed rate of the waste cloth is 60-300 kg/h, and steam pressure of the fiber pulping machine is 4-16 bar.

6. The preparation method according to claim 4, characterized in that a 20-mesh to 40-mesh screen is adopted during sieving.

7. The preparation method according to claim 4, characterized in that the waterborne polyurethane has a particle size of 0.001 to 0.1 μm.

8. The preparation method according to claim 4, characterized in that the printing is one of silk-screen printing, plate making printing, roller coating, thin coating, and knife coating, and a thickness of the printing coating slurry is 0.1-1 mm, and drying temperature is 60-80° C.

9. The preparation method according to claim 4, characterized by further comprising vacuumizing to remove bubbles under a vacuum degree of −0.095-0.1 mPa after a step of preparing recovered fiber coating slurry.

10. A recovered fiber coating containing waste cloth, characterized by being prepared according to the preparation method of claim 4, the recovered fiber coating having a thickness of 0.1-1.0 mm.

11. A recovered fiber coating containing waste cloth, characterized by being prepared according to the preparation method of claim 5, the recovered fiber coating having a thickness of 0.1-1.0 mm.

12. A recovered fiber coating containing waste cloth, characterized by being prepared according to the preparation method of claim 6, the recovered fiber coating having a thickness of 0.1-1.0 mm.

13. A recovered fiber coating containing waste cloth, characterized by being prepared according to the preparation method of claim 7, the recovered fiber coating having a thickness of 0.1-1.0 mm.

14. A recovered fiber coating containing waste cloth, characterized by being prepared according to the preparation method of claim 8, the recovered fiber coating having a thickness of 0.1-1.0 mm.

15. A recovered fiber coating containing waste cloth, characterized by being prepared according to the preparation method of claim 9, the recovered fiber coating having a thickness of 0.1-1.0 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is a sample picture of recovered fiber coating containing waste cloth (40-mesh) according to a preferred embodiment;

[0018] FIG. 2 is a sample picture of recovered fiber coating containing waste cloth (20-mesh) according to a preferred embodiment.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

[0019] Hereinafter, the recovered fiber coating slurry containing the waste cloth according to the first aspect of the present invention, the preparation method for the recovered fiber coating containing the waste cloth according to the second aspect of the present invention, and the recovered fiber coating containing the waste cloth according to the third aspect of the present invention will be described in detail.

[0020] First, the recovered fiber coating slurry containing waste cloth according to the first aspect of the present invention will be described.

[0021] The present invention discloses a recovered fiber coating slurry containing waste cloth, which includes the following components in parts by weight: 0.5-8 parts of recovered fiber of waste cloth, 95-110 parts of waterborne polyurethane, and 4-6 parts of curing agent.

[0022] Preferably, the waste cloth is one or more of chemical fiber, cotton, linen, silk, wool fabric, and blended cloth.

[0023] Preferably, the curing agent is an isocyanate.

[0024] The recovered fiber coating slurry containing waste cloth according to the present invention can be used for preparing various coatings, but other applications of the recovered fiber coating slurry containing waste cloth in the non-coating field are not limited thereby.

[0025] Next, the preparation method for the recovered fiber coating containing waste cloth according to the second aspect of the present invention is described.

[0026] The present invention discloses a preparation method for a recovered fiber coating containing waste cloth, which includes the following steps:

[0027] preparing recovered fiber: crushing waste cloth, sieving to obtain recovered fibers, wherein the waste cloth is one or more of chemical fiber, cotton, linen, silk, wool fabric, and blended cloth;

[0028] preparing recovered fiber coating slurry: uniformly mixing 0.5-8 parts by weight of the recovered fiber, 95-110 parts by weight of waterborne polyurethane, and 4-6 parts by weight of a curing agent to obtain recovered fiber coating slurry, wherein the curing agent is isocyanate;

[0029] and printing: printing the recovered fiber coating slurry on a base cloth or a base plate, and drying to obtain a recovered fiber coating containing waste cloth.

[0030] According to the present invention, the lignocellulose high-concentration, medium-concentration, or the low-concentration pulping machine is adopted for crushing the waste cloth, and the process control of hot grinding under pressure avoids the problems of fiber powder flying and uneven fiber particle thickness caused by static electricity in the cutting process of the traditional waste cloth fiber. After the crushing step, the waste cloth fiber powder is enabled to pass through a sieve with a specific mesh number, and it is ensured that the obtained recovered fiber powder is with fine and uniform size. The raw material source of the waste cloth is not particularly limited, and can be selected from any one of chemical fiber, cotton, linen, silk, wool fabric and blended cloth or any mixture thereof. Chemical fiber raw materials may be, for example, but not limited to, polyester, acrylic, chinlon, polypropylene, vinylon, specialty fibers, and the like. The curing agent isocyanate applied in the present invention can realize slow curing, prolong the printing active time of the slurry, and has the advantages of fewer bubbles, high transparency, and better mechanical property in the coating using the isocyanate curing agent.

[0031] In preferred embodiments, the substrate of recovered fiber coating can be cloth. In other embodiments, the recovered fiber slurry may also carry out printing coating on a base plate which includes, but is not limited to, a plastic plate, a metal plate, a glass plate, etc.

[0032] Besides, in order to maintain optimum application property of the recovered fiber coating slurry, it should be used as soon as possible, preferably printing being carried out within 2 hours after it is prepared.

[0033] Preferably, the waste cloth is crushed by using a fiber pulping machine, and the feeding speed of the waste cloth is 60-300 kg/h, and the steam pressure is 4-16 bar.

[0034] Preferably, during sieving, a 20-40-mesh sieve is used. In order to ensure that the cloth recovery rate reaches more than 50% without affecting the property and appearance of the printed product, a sieve with the range is selected.

[0035] Preferably, the waterborne polyurethane has a particle size of 0.001-0.1 μm. The waterborne polyurethane with the range is more suitable for coating thickening and ensures the mechanical property of the coating.

[0036] Preferably, the printing is one of screen printing, plate making printing, roller painting, thin coating, and knife coating, and the thickness of the printing coating slurry is 0.1-1 mm, and the drying temperature is 60-80° C.

[0037] Preferably, the step of preparing the recovered fiber coating slurry later on further includes vacuumizing to remove bubbles under a vacuum degree of −0.095-0.1 mPa.

[0038] Finally, a recycled fiber coating containing waste cloth according to the third aspect of the present invention is described. A recovered fiber coating containing waste cloth is prepared according to the preparation method according to the second aspect of the present invention, and the thickness of the recovered fiber coating is 0.1-1.0 mm.

[0039] In order to explain the technical content, structural features, achieved objects, and effects of the technical solution in detail, the detailed description will be given below in conjunction with preferred embodiments and accompanying drawings. It is to be understood that these embodiments are merely illustrative of the present application and are not intended to limit the scope of the present application.

Embodiment 1: A Waste-Cloth-Containing Recovered Fiber Coating Slurry and Coating, and a Preparation Method Thereof

[0040] Preparing recovered fiber: crushing waste mixed-color polyester cloth by using an Andritz mill, wherein during crushing, the feeding speed of the waste cloth is 60-300 kg/h, the steam pressure of the Andritz mill is 4-16 bar, and it passes through a 40-mesh sieve to obtain a recovered fiber with the average particle size of less than or equal to 40-mesh;

[0041] preparing recovered fiber coating slurry: uniformly mixing 40-mesh recovered fiber with waterborne polyurethane with the particle size of 0.001-0.1 μm, adding isocyanate curing agent, and uniformly stirring to obtain recovered fiber coating slurry, wherein the mass ratio of the recovered fiber, the waterborne polyurethane, and the isocyanate curing agent is 0.5:100:4;

[0042] and screen printing: preparing a 40-mesh screen printing plate or preparing a prepared screen printing plate in advance, silk-screening the prepared recovered fiber coating slurry on the base surface of the cloth within 2 hours, and drying the silk-screened coating at 60-80° C. to obtain the recovered fiber coating with the thickness of 0.5 mm. FIG. 1 shows a sample of a recovered fiber coating containing waste cloth (40-mesh).

Embodiment 2: A Waste-Cloth-Containing Recovered Fiber Coating Slurry and Coating, and a Preparation Method Thereof

[0043] Preparing recovered fiber: crushing waste blue acrylic fiber cloth by using an Andritz mill, wherein during crushing, the feeding speed of the waste cloth is 60-300 kg/h, the steam pressure of the Andritz mill is 4-16 bar, and it passes through a 20-mesh sieve to obtain a recovered fiber with the average particle size of less than or equal to 20-mesh;

[0044] preparing recovered fiber coating slurry: uniformly mixing 20-mesh recovered fiber with waterborne polyurethane with the particle size of 0.001-0.1 μm, adding isocyanate curing agent, and uniformly stirring to obtain recovered fiber coating slurry, wherein the mass ratio of the recovered fiber, the waterborne polyurethane, and the isocyanate curing agent is 1.5:95:6;

[0045] and screen printing: preparing a 20-mesh screen printing plate or preparing a prepared screen printing plate in advance, silk-screening the prepared recovered fiber slurry on the base surface of the cloth within 2 hours, controlling the printing thickness to be 0.1 mm, and drying the silk-screened coating at 60-80° C. to obtain the recovered fiber coating with the thickness of 0.1 mm. FIG. 2 shows a sample of a recovered fiber coating containing waste cloth (20-mesh).

Embodiment 3: A Waste-Cloth-Containing Recovered Fiber Coating Slurry and Coating, and a Preparation Method Thereof

[0046] Preparing recovered fiber: crushing waste white cotton by using an Andritz mill, wherein during crushing, the feeding speed of the waste cloth is 60-300 kg/h, the steam pressure of the Andritz mill is 4-16 bar, and it passes through a 30-mesh sieve to obtain a recovered fiber with the average particle size of less than or equal to 30-mesh;

[0047] preparing recovered fiber coating slurry: uniformly mixing 30-mesh recovered fiber with waterborne polyurethane with the particle size of 0.001-0.1 μm, adding isocyanate curing agent, and uniformly stirring to obtain the slurry containing recovered fiber, wherein the mass ratio of the recovered fiber, the waterborne polyurethane, and the isocyanate curing agent is 5:110:4;

[0048] and screen printing: preparing a 30-mesh screen printing plate or preparing a prepared screen printing plate in advance, silk-screening the prepared recovered fiber slurry on the base surface of the cloth within 2 hours, controlling the printing thickness to be 1.0 mm, and drying the silk-screened coating at 60-80° C. to obtain the recovered fiber coating with the thickness of 1.0 mm.

Embodiment 4: A Waste-Cloth-Containing Recovered Fiber Coating Slurry and Coating, and a Preparation Method Thereof

[0049] Preparing recovered fiber: crushing waste grey linen by using a lignin fiber low-concentration mill, wherein during crushing, the feeding speed of the waste cloth is 60-300 kg/h, the steam pressure of the lignin fiber low-concentration mill is 4-16 bar, and it passes through a 40-mesh sieve to obtain a recovered fiber with the average particle size of less than or equal to 40-mesh;

[0050] preparing recovered fiber coating slurry: uniformly mixing 40-mesh recovered fiber with waterborne polyurethane, adding isocyanate curing agent, and uniformly stirring to obtain the slurry containing recovered fiber, wherein the mass ratio of the recovered fiber, the waterborne polyurethane, and the isocyanate curing agent is 8:110:4;

[0051] vacuumizing the recovered fiber coating slurry to remove bubbles under a vacuum degree of −0.095-0.1 mPa;

[0052] and knife coating printing: knife coating the prepared recovered fiber slurry on a plastic base plate within 2 hours, controlling the knife coating thickness to be 0.5 mm, and drying the knife coated coating at 60-80° C. to obtain the recovered fiber coating with the thickness of 0.5 mm.

Embodiment 5: A Waste-Cloth-Containing Recovered Fiber Coating Slurry and Coating, and a Preparation Method Thereof

[0053] Preparing recovered fiber: crushing waste blended cloth by using a lignin fiber medium-concentration mill, wherein during crushing, the feeding speed of the waste cloth is 60-300 kg/h, the steam pressure of the lignin fiber medium-concentration mill is 4-16 bar, and it passes through a 30-mesh sieve to obtain a recovered fiber with the average particle size of less than or equal to 30-mesh;

[0054] preparing recovered fiber coating slurry: uniformly mixing 30-mesh recovered fiber with waterborne polyurethane, adding isocyanate curing agent and uniformly stirring to obtain recovered fiber coating slurry, wherein the mass ratio of the recovered fiber, the waterborne polyurethane, and the isocyanate curing agent is 5:110:4;

[0055] vacuumizing the recovered fiber coating slurry to remove bubbles under a vacuum degree of −0.095-0.1 mPa;

[0056] and printing: thin coating the prepared recovered fiber coating slurry on a metal base plate within 2 hours by 0.5 mm, and drying at 60-80° C. to obtain the recovered fiber coating with the thickness of 0.5 mm.

Comparative Example 1: Blank Coating Preparation

[0057] Comparative example 1 differs from Example 1 in that: the recovered fiber is not added into the coating slurry, and all the coating slurry is prepared by uniformly mixing the waterborne polyurethane and the isocyanate curing agent in a mass ratio of 115:5.

[0058] The recovered fiber coating cloth containing waste cloth prepared in embodiments 1-5, the blank coating cloth prepared in comparative example 1, and the cloth base material before coating are subjected to a coated fabric tearing strength test and an abrasion resistance test.

[0059] The tearing strength testing method comprises steps as follows: according to GB/T3917.3-2009 “Textiles-Tear Properties of Fabrics-Part 1: Determination of Tear Force of Trapezoid-shaped Test Specimens”, the tearing strength of coated fabrics is determined by adopting a YG0268 electronic fabric strength tester.

[0060] The abrasion resistance testing method comprises steps as follows: the method is carried out according to GB/T 21196.3-2007 “Textiles-Determination of the Abrasion Resistance of Fabrics by the Martindale Method-Part 3: Determination of Mass Loss” by adopting a GT-7012-M abrasion resistance tester to test.

[0061] The tear strength and abrasion tester test results for the coated fabric and the cloth without the coating of embodiments 1-5 and comparative example 1 are shown in Table 1.

TABLE-US-00001 TABLE 1 The tear strength and abrasion resistance index test results for the coated fabric of embodiments 1-5 and comparative example 1 Cloth Before Comparative Sample Coating Example 1 Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Tear Strength/N 59.23 66.27 74.90 69.01 83.36 82.90 67.59 Abrasion Resistance None 32 29 23 18 11 20 Index (times/mg)

[0062] From the results of Table 1, it can be seen that the tear strength of the coated fabric containing recovered fiber of embodiments 1-5, which adopt recovered fiber containing waste cloth, is greater than that of comparative example 1 and the cloth before using coating. The tear strength of the coated fabric obtained in embodiment 3 is superior to that of other embodiments, indicating that both the content of the waste cloth in the coating slurry and the thickness of the coating have an influence on the tear strength. Because the recovered fibers after the waste cloth is crushed are uniformly dispersed in the dispersion system of the waterborne polyurethane, stress dispersion is facilitated, the enhancement of the waterborne polyurethane coating by the fibers is realized, the technical field of recycling of the waste cloth is expanded, and a good way is provided for recycling the waste cloth by a physical method.

[0063] It should be noted that although the above-mentioned embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments described herein, or equivalent structures or equivalent process transformations made by using the content of the description and drawings of the present invention, and direct or indirect application of the above technical solutions in other related technical fields, are all included in the scope of patent protection of the present invention.