阅读说明：本技术 一种沙发用易去污高耐磨合成革及其制备方法 (Easy-to-clean high-wear-resistance synthetic leather for sofa and preparation method thereof ) 是由 黄金 黄银 陈渊源 于 2021-10-28 设计创作，主要内容包括：本发明公开了一种沙发用易去污高耐磨合成革及其制备方法；所述沙发用易去污高耐磨合成革由沙发用聚氨酯合成革坯底表面涂饰抗污耐磨浆料制备而成；所述沙发用聚氨酯合成革坯底由聚氨酯膜片与基布复合成型,所述聚氨酯膜片由聚氨酯浆料经T型流延头挤出成型；所述聚氨酯浆料包括以下重量份的原料：水性聚氨酯60份～90份、N,N-二甲基甲酰胺30份～45份、超细木质素5份～10份、纳米碳酸钙10份～28份。本发明制得的合成革具有天然皮革的风格和外观,手感柔软,具有高耐磨性、透气性,通过在合成革坯底表面涂布的抗污耐磨浆料,使得合革产品表面易清理,不占污渍,抗污耐磨浆料与合成革坯底粘结性高,耐磨性优异,使用寿命长。(The invention discloses easy-to-clean high-abrasion-resistance synthetic leather for a sofa and a preparation method thereof; the easy-to-clean high-wear-resistance synthetic leather for sofa is prepared by coating anti-fouling wear-resistance slurry on the surface of a polyurethane synthetic leather blank for sofa; the polyurethane synthetic leather blank bottom for the sofa is formed by compounding a polyurethane film sheet and base cloth, and the polyurethane film sheet is formed by extruding polyurethane slurry through a T-shaped tape casting head; the polyurethane slurry comprises the following raw materials in parts by weight: 60-90 parts of waterborne polyurethane, 30-45 parts of N, N-dimethylformamide, 5-10 parts of ultrafine lignin and 10-28 parts of nano calcium carbonate. The synthetic leather prepared by the invention has the style and appearance of natural leather, is soft in hand feeling, has high wear resistance and air permeability, and the anti-fouling wear-resistant slurry coated on the bottom surface of the synthetic leather blank is easy to clean the surface of a leather-combined product, does not occupy stains, and has high adhesion with the bottom of the synthetic leather blank, excellent wear resistance and long service life.)

1. The easy-to-clean high-wear-resistance synthetic leather for the sofa is characterized by being prepared by coating anti-soil wear-resistance slurry on the surface of a polyurethane synthetic leather blank for the sofa; the polyurethane synthetic leather blank bottom for the sofa is formed by compounding a polyurethane film sheet and base cloth, and the polyurethane film sheet is formed by extruding polyurethane slurry through a T-shaped tape casting head; the polyurethane slurry comprises the following raw materials in parts by weight: 60-90 parts of waterborne polyurethane, 30-45 parts of N, N-dimethylformamide, 5-10 parts of ultrafine lignin and 10-28 parts of nano calcium carbonate.

2. The easy-to-clean high-abrasion-resistant synthetic leather for the sofa according to claim 1, wherein the anti-soil abrasion-resistant slurry comprises the following raw materials in parts by weight: 35 to 60 parts of aqueous polyurethane emulsion, 15 to 25 parts of acrylate mixture, 5 to 10 parts of dodecafluoroheptyl methacrylate, 1 to 3 parts of initiator, 5 to 15 parts of nano filler, 6 to 12 parts of nano modified gelatin and 2 to 6 parts of thickener.

3. The easy-to-clean high-abrasion-resistance synthetic leather for the sofa according to claim 2, wherein the anti-soil abrasion-resistance slurry comprises the following raw materials in parts by weight: 45 parts of aqueous polyurethane emulsion, 17 parts of acrylate mixture, 8 parts of dodecafluoroheptyl methacrylate, 2.2 parts of initiator, 8 parts of nano filler, 8 parts of nano modified gelatin and 3 parts of thickener.

4. The easy-to-clean high-abrasion-resistance synthetic leather for the sofa according to claim 2, wherein the acrylate mixture is a mixture of methyl methacrylate and butyl methacrylate according to a mass ratio of 1-2: 1.

5. The easy-to-clean high-abrasion-resistant synthetic leather for the sofa according to claim 2, wherein the nano filler is any one or a combination of more than two of nano calcium carbonate, nano titanium dioxide, nano silicon dioxide and nano zinc dioxide; the grain diameter of the nano filler is less than or equal to 200 nm.

6. The easy-to-clean high-abrasion-resistance synthetic leather for the sofa according to claim 2, wherein the preparation method of the nano modified gelatin comprises the following steps:

s1, adding gelatin into water, and uniformly dispersing to obtain a gelatin solution with the concentration of 20%; adding a hydrochloric acid solution with the concentration of 1mol/L into a gelatin solution, stopping adding when the pH value is 3-5, and stirring and dispersing uniformly to obtain a mixed solution;

s2, dissolving titanium alcohol ester in absolute ethyl alcohol, stirring until the titanium alcohol ester is completely dissolved, adding acetylacetone, heating to 30-45 ℃, and fully stirring and uniformly mixing to obtain a modifier;

s3, dropwise adding the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 30-45 ℃, stirring for 2-4 h, adjusting the pH value to 8-9.5 with ammonia water, and continuously stirring for 1-1.5 h at constant temperature to obtain the nano modified gelatin.

7. The preparation method of the soil-release high-wear-resistance synthetic leather for the sofa according to any one of claims 1 to 6, which is characterized by comprising the following steps:

(1) melting and blending the waterborne polyurethane, the N, N-dimethylformamide, the superfine lignin and the nano calcium carbonate in parts by weight, and extruding the mixture by a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane film sheet; compounding and molding the polyurethane film with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank bottom for the sofa;

(2) mixing the waterborne polyurethane emulsion with the acrylic acid mixture in parts by weight, fully stirring and uniformly mixing, then adding the dodecafluoroheptyl methacrylate and the initiator in parts by weight, and fully polymerizing, dispersing and emulsifying to obtain a modified waterborne polyurethane emulsion;

(3) mixing and grinding the nano filler and the nano modified gelatin in parts by weight, uniformly stirring and mixing the mixture with the modified waterborne polyurethane emulsion obtained in the step (2), adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling wear-resistant slurry;

(4) and (3) coating the anti-fouling wear-resistant slurry obtained in the step (3) on the bottom surface of the polyurethane synthetic leather blank for the sofa obtained in the step (1) through a coating process, and drying, cooling and drying to obtain the soil-release high-wear-resistant synthetic leather for the sofa.

8. The method for preparing the soil-release high-abrasion-resistance synthetic leather for the sofa according to claim 7, wherein in the step (4), the coating procedure is that the sprayed soil-resistant abrasion-resistance slurry obtained in the step (3) is uniformly sprayed on the bottom surface of the polyurethane synthetic leather blank for the sofa obtained in the step (1) through a pressurized spraying device; the coating weight is 20g/m to 30 g/m.

Technical Field

The invention relates to the technical field of synthetic leather, and particularly relates to easy-to-clean high-wear-resistance synthetic leather for a sofa and a preparation method thereof.

Background

Natural leather has excellent natural characteristics, and is widely used for producing daily necessities and industrial products, but with the increase of the world population, the demand of human beings on leather is multiplied, and the demand of people cannot be met by the limited natural leather. In order to meet the demand of people on leather, scientists research and develop artificial leather and synthetic leather. The polyurethane synthetic leather has the appearance of soft and natural luster, soft hand feeling and strong real leather feeling, has excellent mechanical properties such as excellent bonding property with a base material, abrasion resistance, flexing resistance, ageing resistance and the like, also has the advantages of good cold resistance, ventilation, washability, convenient processing, low price and the like, is the most ideal substitute of natural leather, and is widely applied to the industries such as clothing, shoe industry, bags, furniture and the like.

Chinese patent CN101748607A discloses a preparation method of easy-to-clean high-wear-resistance durable synthetic leather for sofa furniture, which comprises the steps of coating a layer of colorless surface treatment slurry on the surface of the synthetic leather for sofa furniture, wherein the colorless surface treatment slurry comprises 80-120 parts by weight of a two-liquid polyurethane resin, 1.5-2.5 parts by weight of a cross-linking agent, 10 parts by weight of an antifouling treatment agent and 30-45 parts by weight of dimethylformamide; the obtained synthetic leather for sofa furniture has the performance that the surface can be easily wiped clean by cloth after being polluted by oil stain, coffee, dust and the like, and the wear resistance and the service performance of the product are greatly improved. The two-liquid polyurethane resin in the colorless surface treatment slurry disclosed by the patent is not yellowing-resistant, the antifouling treatment agent has little effect on the stain removal and dirt resistance of leather, and the wear resistance of the two-liquid polyurethane resin serving as synthetic leather for sofa furniture is still to be further improved.

Chinese patent CN108914608A discloses a frosted high-grade sofa leather easy to clean, which sequentially comprises a fabric bottom layer, a fabric layer, a surface layer and a coating layer from bottom to top, wherein the fabric bottom layer is single-sided flannelette, an adhesive layer is arranged between the fabric bottom layer and the fabric layer, the fabric bottom layer and the fabric layer are compounded through the adhesive layer, the surface layer is a dry PU synthetic leather surface layer, a polyester resin coating is coated on the lower end surface of the surface layer, and the polyester resin coating is arranged close to the fabric layer; the thickness of the surface layer is 0.15mm, and the thickness of the polyester resin coating is 0.2 mm; the coating layer is a soil release material coating. Above-mentioned patent passes through the coating of easy decontamination material of surface course surface coating to make the leather brighter, more resistant dirty, nevertheless through the viscose layer complex between fabric bottom and the fabric, can influence sofa leather to a certain extent and feel, and sofa leather's wearability is because of the coating of the easy decontamination material coating on coating surface, makes leather wear resistance not good.

Disclosure of Invention

In view of the above, the invention provides an easy-to-clean high-wear-resistance synthetic leather for a sofa and a preparation method thereof, so as to solve the technical problems.

The invention provides the following technical scheme:

the easy-to-clean high-wear-resistance synthetic leather for the sofa is prepared by coating anti-soil wear-resistance slurry on the surface of a polyurethane synthetic leather blank for the sofa; the polyurethane synthetic leather blank bottom for the sofa is formed by compounding a polyurethane film sheet and base cloth, and the polyurethane film sheet is formed by extruding polyurethane slurry through a T-shaped tape casting head; the polyurethane slurry comprises the following raw materials in parts by weight: 60-90 parts of waterborne polyurethane, 30-45 parts of N, N-dimethylformamide, 5-10 parts of ultrafine lignin and 10-28 parts of nano calcium carbonate.

Preferably, the anti-fouling and wear-resistant slurry comprises the following raw materials in parts by weight: 35 to 60 parts of aqueous polyurethane emulsion, 15 to 25 parts of acrylate mixture, 5 to 10 parts of dodecafluoroheptyl methacrylate, 1 to 3 parts of initiator, 5 to 15 parts of nano filler, 6 to 12 parts of nano modified gelatin and 2 to 6 parts of thickener.

More preferably, the anti-fouling and wear-resisting slurry comprises the following raw materials in parts by weight: 40 to 55 parts of aqueous polyurethane emulsion, 18 to 22 parts of acrylate mixture, 6 to 8 parts of dodecafluoroheptyl methacrylate, 1.5 to 2.5 parts of initiator, 8 to 12 parts of nano filler, 8 to 10 parts of nano modified gelatin and 3 to 5 parts of thickener.

More preferably, the anti-fouling and wear-resisting slurry comprises the following raw materials in parts by weight: 45 parts of aqueous polyurethane emulsion, 17 parts of acrylate mixture, 8 parts of dodecafluoroheptyl methacrylate, 2.2 parts of initiator, 8 parts of nano filler, 8 parts of nano modified gelatin and 3 parts of thickener.

More preferably, the acrylate mixture is a mixture of methyl methacrylate and butyl methacrylate according to the mass ratio of 1-2: 1.

More preferably, the nano filler is any one or the combination of more than two of nano calcium carbonate, nano titanium dioxide, nano silicon dioxide and nano zinc dioxide; the grain diameter of the nano filler is less than or equal to 200 nm.

More preferably, the preparation method of the nano-modified gelatin comprises the following steps:

s1, adding gelatin into water, and uniformly dispersing to obtain a gelatin solution with the concentration of 20%; adding a hydrochloric acid solution with the concentration of 1mol/L into a gelatin solution, stopping adding when the pH value is 3-5, and stirring and dispersing uniformly to obtain a mixed solution;

s2, dissolving titanium alcohol ester in absolute ethyl alcohol, stirring until the titanium alcohol ester is completely dissolved, adding acetylacetone, heating to 30-45 ℃, and fully stirring and uniformly mixing to obtain a modifier;

s3, dropwise adding the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 30-45 ℃, stirring for 2-4 h, adjusting the pH value to 8-9.5 with ammonia water, and continuously stirring for 1-1.5 h at constant temperature to obtain the nano modified gelatin.

The invention also aims to provide a preparation method of the easy-decontamination high-wear-resistance synthetic leather for sofa, which comprises the following steps:

(1) melting and blending the waterborne polyurethane, the N, N-dimethylformamide, the superfine lignin and the nano calcium carbonate in parts by weight, and extruding the mixture by a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane film sheet; compounding and molding the polyurethane film with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank bottom for the sofa;

(2) mixing the waterborne polyurethane emulsion with the acrylic acid mixture in parts by weight, fully stirring and uniformly mixing, then adding the dodecafluoroheptyl methacrylate and the initiator in parts by weight, and fully polymerizing, dispersing and emulsifying to obtain a modified waterborne polyurethane emulsion;

(3) mixing and grinding the nano filler and the nano modified gelatin in parts by weight, uniformly stirring and mixing the mixture with the modified waterborne polyurethane emulsion obtained in the step (2), adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling wear-resistant slurry;

(4) and (3) coating the anti-fouling wear-resistant slurry obtained in the step (3) on the bottom surface of the polyurethane synthetic leather blank for the sofa obtained in the step (1) through a coating process, and drying, cooling and drying to obtain the soil-release high-wear-resistant synthetic leather for the sofa.

Preferably, in the step (4), the coating process is to uniformly coat the coating anti-fouling and wear-resisting slurry obtained in the step (3) on the bottom surface of the sofa polyurethane synthetic leather blank obtained in the step (1) by a pressurized spraying device; the coating weight is 20g/m to 30 g/m.

According to the technical scheme, the invention has the beneficial effects that:

(1) the stain-resistant and wear-resistant synthetic leather for the sofa has the style and appearance of natural leather, is soft in hand feeling, has high wear resistance and air permeability, and can be easily cleaned and does not occupy stains by coating the stain-resistant and wear-resistant slurry on the surface of the synthetic leather blank, so that the stain-resistant and wear-resistant slurry is high in cohesiveness with the synthetic leather blank bottom, excellent in wear resistance and long in service life.

(2) The characteristics of the polyurethane slurry coated on the surface of the synthetic leather in the easy-to-clean high-wear-resistance synthetic leather for the sofa are greatly dependent on the performance of polyurethane resin, and the waterborne polyurethane has better hardness and chemical stability but no yellowing resistance.

(3) The nano modified gelatin is added into the anti-fouling wear-resistant slurry coated on the surface of the synthetic leather, so that the surface tension of the synthetic leather can be obviously reduced, the thermal stability and air permeability of a synthetic leather product are improved, and the nano modified gelatin also has a certain antibacterial property; the abrasion resistance of the synthetic leather can be improved by adding the nano filler; has good bonding effect with synthetic leather, and has excellent water resistance, heat resistance and flexibility.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

Example 1

Easy-to-clean high-wear-resistance synthetic leather for sofa and preparation method thereof

The easy-to-clean high-wear-resistance synthetic leather for the sofa is prepared by coating anti-fouling wear-resistance slurry on the surface of a polyurethane synthetic leather blank for the sofa; the polyurethane synthetic leather blank bottom for the sofa is formed by compounding a polyurethane film sheet and base cloth, and the polyurethane film sheet is formed by extruding polyurethane slurry through a T-shaped tape casting head; the polyurethane slurry comprises the following raw materials in parts by weight: 60 parts of waterborne polyurethane, 30 parts of N, N-dimethylformamide, 5 parts of superfine lignin and 10 parts of nano calcium carbonate.

The anti-fouling wear-resistant slurry comprises the following raw materials in parts by weight: 35 parts of aqueous polyurethane emulsion, 15 parts of acrylate mixture, 5 parts of dodecafluoroheptyl methacrylate, 1 part of initiator, 5 parts of nano filler, 6 parts of nano modified gelatin and 2 parts of thickener. The acrylic ester mixture is a mixture of methyl methacrylate and butyl methacrylate according to the mass ratio of 1: 1; the nano filler is nano calcium carbonate; the grain diameter of the nano filler is less than or equal to 200 nm.

The preparation method of the nano modified gelatin comprises the following steps:

s1, adding gelatin into water, and uniformly dispersing to obtain a gelatin solution with the concentration of 20%; adding a hydrochloric acid solution with the concentration of 1mol/L into a gelatin solution, stopping adding when the pH value is 3, and stirring and dispersing uniformly to obtain a mixed solution;

s2, dissolving titanium alcohol ester in absolute ethyl alcohol, stirring until the titanium alcohol ester is completely dissolved, adding acetylacetone, heating to 30 ℃, and fully stirring and uniformly mixing to obtain a modifier;

s3, dropwise adding the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 30 ℃, stirring for 2 hours, adjusting the pH value to 8 by ammonia water, and continuously stirring for 1 hour at constant temperature to obtain the nano modified gelatin.

The preparation method of the easy-decontamination high-abrasion-resistance synthetic leather for the sofa comprises the following steps:

(1) melting and blending the waterborne polyurethane, the N, N-dimethylformamide, the superfine lignin and the nano calcium carbonate in parts by weight, and extruding the mixture by a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane film sheet; compounding and molding the polyurethane film with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank bottom for the sofa;

(2) mixing the aqueous polyurethane emulsion and the acrylic acid mixture in parts by weight, fully stirring and uniformly mixing, then adding the dodecafluoroheptyl methacrylate and the initiator in parts by weight, and fully polymerizing, dispersing and emulsifying to obtain a modified aqueous polyurethane emulsion;

(3) mixing and grinding the nano filler and the nano modified gelatin in parts by weight, uniformly stirring and mixing the mixture with the modified waterborne polyurethane emulsion obtained in the step (2), adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling wear-resistant slurry;

(4) and (3) coating the anti-fouling wear-resistant slurry obtained in the step (3) on the bottom surface of the polyurethane synthetic leather blank for the sofa obtained in the step (1) through a coating process, and drying, cooling and drying to obtain the soil-release high-wear-resistant synthetic leather for the sofa.

In the step (4), the coating procedure is that the anti-fouling and wear-resistant coating obtained in the step (3) is uniformly sprayed on the bottom surface of the sofa polyurethane synthetic leather blank obtained in the step (1) through a pressurized spraying device; the coating weight was 20 g/m.

Example 2

Easy-to-clean high-wear-resistance synthetic leather for sofa and preparation method thereof

The easy-to-clean high-wear-resistance synthetic leather for the sofa is prepared by coating anti-fouling wear-resistance slurry on the surface of a polyurethane synthetic leather blank for the sofa; the polyurethane synthetic leather blank bottom for the sofa is formed by compounding a polyurethane film sheet and base cloth, and the polyurethane film sheet is formed by extruding polyurethane slurry through a T-shaped tape casting head; the polyurethane slurry comprises the following raw materials in parts by weight: 65 parts of waterborne polyurethane, 35 parts of N, N-dimethylformamide, 6 parts of superfine lignin and 13 parts of nano calcium carbonate.

The anti-fouling wear-resistant slurry comprises the following raw materials in parts by weight: 40 parts of aqueous polyurethane emulsion, 18 parts of acrylate mixture, 6 parts of dodecafluoroheptyl methacrylate, 1.5 parts of initiator, 8 parts of nano filler, 8 parts of nano modified gelatin and 3 parts of thickener. The acrylic ester mixture is a mixture of methyl methacrylate and butyl methacrylate according to the mass ratio of 1.2: 1; the nano filler is the combination of nano calcium carbonate and nano titanium dioxide; the grain diameter of the nano filler is less than or equal to 200 nm.

The preparation method of the nano modified gelatin comprises the following steps:

s1, adding gelatin into water, and uniformly dispersing to obtain a gelatin solution with the concentration of 20%; adding a hydrochloric acid solution with the concentration of 1mol/L into a gelatin solution, stopping adding when the pH value is 4, and stirring and dispersing uniformly to obtain a mixed solution;

s2, dissolving titanium alcohol ester in absolute ethyl alcohol, stirring until the titanium alcohol ester is completely dissolved, adding acetylacetone, heating to 35 ℃, and fully stirring and uniformly mixing to obtain a modifier;

s3, dropwise adding the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 35 ℃, stirring for 2 hours, adjusting the pH value to 8 with ammonia water, and continuously stirring for 1 hour at constant temperature to obtain the nano modified gelatin.

The preparation method of the easy-decontamination high-abrasion-resistance synthetic leather for the sofa comprises the following steps:

(1) melting and blending the waterborne polyurethane, the N, N-dimethylformamide, the superfine lignin and the nano calcium carbonate in parts by weight, and extruding the mixture by a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane film sheet; compounding and molding the polyurethane film with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank bottom for the sofa;

(2) mixing the aqueous polyurethane emulsion and the acrylic acid mixture in parts by weight, fully stirring and uniformly mixing, then adding the dodecafluoroheptyl methacrylate and the initiator in parts by weight, and fully polymerizing, dispersing and emulsifying to obtain a modified aqueous polyurethane emulsion;

(3) mixing and grinding the nano filler and the nano modified gelatin in parts by weight, uniformly stirring and mixing the mixture with the modified waterborne polyurethane emulsion obtained in the step (2), adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling wear-resistant slurry;

(4) and (3) coating the anti-fouling wear-resistant slurry obtained in the step (3) on the bottom surface of the polyurethane synthetic leather blank for the sofa obtained in the step (1) through a coating process, and drying, cooling and drying to obtain the soil-release high-wear-resistant synthetic leather for the sofa.

In the step (4), the coating procedure is that the anti-fouling and wear-resistant coating obtained in the step (3) is uniformly sprayed on the bottom surface of the sofa polyurethane synthetic leather blank obtained in the step (1) through a pressurized spraying device; the coating weight was 25 g/m.

Example 3

Easy-to-clean high-wear-resistance synthetic leather for sofa and preparation method thereof

The easy-to-clean high-wear-resistance synthetic leather for the sofa is prepared by coating anti-fouling wear-resistance slurry on the surface of a polyurethane synthetic leather blank for the sofa; the polyurethane synthetic leather blank bottom for the sofa is formed by compounding a polyurethane film sheet and base cloth, and the polyurethane film sheet is formed by extruding polyurethane slurry through a T-shaped tape casting head; the polyurethane slurry comprises the following raw materials in parts by weight: 70 parts of waterborne polyurethane, 38 parts of N, N-dimethylformamide, 8 parts of superfine lignin and 15 parts of nano calcium carbonate.

The anti-fouling wear-resistant slurry comprises the following raw materials in parts by weight: 45 parts of aqueous polyurethane emulsion, 17 parts of acrylate mixture, 8 parts of dodecafluoroheptyl methacrylate, 2.2 parts of initiator, 8 parts of nano filler, 8 parts of nano modified gelatin and 3 parts of thickener. The acrylic ester mixture is a mixture of methyl methacrylate and butyl methacrylate according to the mass ratio of 2: 1; the nano filler is a combination of nano calcium carbonate, nano titanium dioxide, nano silicon dioxide and nano zinc dioxide; the grain diameter of the nano filler is less than or equal to 200 nm.

The preparation method of the nano modified gelatin comprises the following steps:

s1, adding gelatin into water, and uniformly dispersing to obtain a gelatin solution with the concentration of 20%; adding a hydrochloric acid solution with the concentration of 1mol/L into a gelatin solution, stopping adding when the pH value is 5, and stirring and dispersing uniformly to obtain a mixed solution;

s2, dissolving titanium alcohol ester in absolute ethyl alcohol, stirring until the titanium alcohol ester is completely dissolved, adding acetylacetone, heating to 45 ℃, and fully stirring and uniformly mixing to obtain a modifier;

s3, dropwise adding the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 45 ℃, stirring for 2-4 h, adjusting the pH value to 9 with ammonia water, and continuously stirring at constant temperature for 1.5h to obtain the nano modified gelatin.

The preparation method of the easy-decontamination high-abrasion-resistance synthetic leather for the sofa comprises the following steps:

(1) melting and blending the waterborne polyurethane, the N, N-dimethylformamide, the superfine lignin and the nano calcium carbonate in parts by weight, and extruding the mixture by a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane film sheet; compounding and molding the polyurethane film with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank bottom for the sofa;

(2) mixing the aqueous polyurethane emulsion and the acrylic acid mixture in parts by weight, fully stirring and uniformly mixing, then adding the dodecafluoroheptyl methacrylate and the initiator in parts by weight, and fully polymerizing, dispersing and emulsifying to obtain a modified aqueous polyurethane emulsion;

(3) mixing and grinding the nano filler and the nano modified gelatin in parts by weight, uniformly stirring and mixing the mixture with the modified waterborne polyurethane emulsion obtained in the step (2), adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling wear-resistant slurry;

(4) and (3) coating the anti-fouling wear-resistant slurry obtained in the step (3) on the bottom surface of the polyurethane synthetic leather blank for the sofa obtained in the step (1) through a coating process, and drying, cooling and drying to obtain the soil-release high-wear-resistant synthetic leather for the sofa.

In the step (4), the coating procedure is that the anti-fouling and wear-resistant coating obtained in the step (3) is uniformly sprayed on the bottom surface of the sofa polyurethane synthetic leather blank obtained in the step (1) through a pressurized spraying device; the coating weight was 30 g/m.

Example 4

Easy-to-clean high-wear-resistance synthetic leather for sofa and preparation method thereof

The easy-to-clean high-wear-resistance synthetic leather for the sofa is prepared by coating anti-fouling wear-resistance slurry on the surface of a polyurethane synthetic leather blank for the sofa; the polyurethane synthetic leather blank bottom for the sofa is formed by compounding a polyurethane film sheet and base cloth, and the polyurethane film sheet is formed by extruding polyurethane slurry through a T-shaped tape casting head; the polyurethane slurry comprises the following raw materials in parts by weight: 7590 parts of waterborne polyurethane, 40 parts of N, N-dimethylformamide, 8 parts of superfine lignin and 20 parts of nano calcium carbonate.

The anti-fouling wear-resistant slurry comprises the following raw materials in parts by weight: 48 parts of aqueous polyurethane emulsion, 20 parts of acrylate mixture, 7 parts of dodecafluoroheptyl methacrylate, 2 parts of initiator, 10 parts of nano filler, 9 parts of nano modified gelatin and 4 parts of thickener. The acrylate mixture is a mixture consisting of methyl methacrylate and butyl methacrylate according to a mass ratio of 1-2: 1; the nano filler is the combination of nano titanium dioxide and nano zinc dioxide; the grain diameter of the nano filler is less than or equal to 200 nm.

The preparation method of the nano modified gelatin comprises the following steps:

s1, adding gelatin into water, and uniformly dispersing to obtain a gelatin solution with the concentration of 20%; adding a hydrochloric acid solution with the concentration of 1mol/L into a gelatin solution, stopping adding when the pH value is 4, and stirring and dispersing uniformly to obtain a mixed solution;

s2, dissolving titanium alcohol ester in absolute ethyl alcohol, stirring until the titanium alcohol ester is completely dissolved, adding acetylacetone, heating to 40 ℃, and fully stirring and uniformly mixing to obtain a modifier;

s3, dropwise adding the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 40 ℃, stirring for 2-4 h, adjusting the pH value to 8-9.5 with ammonia water, and continuously stirring at constant temperature for 1.5h to obtain the nano modified gelatin.

The preparation method of the easy-decontamination high-abrasion-resistance synthetic leather for the sofa comprises the following steps:

(1) melting and blending the waterborne polyurethane, the N, N-dimethylformamide, the superfine lignin and the nano calcium carbonate in parts by weight, and extruding the mixture by a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane film sheet; compounding and molding the polyurethane film with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank bottom for the sofa;

(2) mixing the aqueous polyurethane emulsion and the acrylic acid mixture in parts by weight, fully stirring and uniformly mixing, then adding the dodecafluoroheptyl methacrylate and the initiator in parts by weight, and fully polymerizing, dispersing and emulsifying to obtain a modified aqueous polyurethane emulsion;

(3) mixing and grinding the nano filler and the nano modified gelatin in parts by weight, uniformly stirring and mixing the mixture with the modified waterborne polyurethane emulsion obtained in the step (2), adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling wear-resistant slurry;

(4) and (3) coating the anti-fouling wear-resistant slurry obtained in the step (3) on the bottom surface of the polyurethane synthetic leather blank for the sofa obtained in the step (1) through a coating process, and drying, cooling and drying to obtain the soil-release high-wear-resistant synthetic leather for the sofa.

In the step (4), the coating procedure is that the anti-fouling and wear-resistant coating obtained in the step (3) is uniformly sprayed on the bottom surface of the sofa polyurethane synthetic leather blank obtained in the step (1) through a pressurized spraying device; the coating weight was 25 g/m.

Example 5

Easy-to-clean high-wear-resistance synthetic leather for sofa and preparation method thereof

The easy-to-clean high-wear-resistance synthetic leather for the sofa is prepared by coating anti-fouling wear-resistance slurry on the surface of a polyurethane synthetic leather blank for the sofa; the polyurethane synthetic leather blank bottom for the sofa is formed by compounding a polyurethane film sheet and base cloth, and the polyurethane film sheet is formed by extruding polyurethane slurry through a T-shaped tape casting head; the polyurethane slurry comprises the following raw materials in parts by weight: 85 parts of waterborne polyurethane, 42 parts of N, N-dimethylformamide, 9 parts of superfine lignin and 25 parts of nano calcium carbonate.

The anti-fouling wear-resistant slurry comprises the following raw materials in parts by weight: 55 parts of aqueous polyurethane emulsion, 22 parts of acrylate mixture, 8 parts of dodecafluoroheptyl methacrylate, 2.5 parts of initiator, 12 parts of nano filler, 10 parts of nano modified gelatin and 5 parts of thickener. The acrylic ester mixture is a mixture of methyl methacrylate and butyl methacrylate according to the mass ratio of 1.8: 1; the nano filler is a combination of nano calcium carbonate, nano silicon dioxide and nano zinc dioxide; the grain diameter of the nano filler is less than or equal to 200 nm.

The preparation method of the nano modified gelatin comprises the following steps:

s1, adding gelatin into water, and uniformly dispersing to obtain a gelatin solution with the concentration of 20%; adding 1mol/L hydrochloric acid solution into gelatin solution, stopping adding when the pH value is 4.5, and stirring and dispersing uniformly to obtain mixed solution;

s2, dissolving titanium alcohol ester in absolute ethyl alcohol, stirring until the titanium alcohol ester is completely dissolved, adding acetylacetone, heating to 40 ℃, and fully stirring and uniformly mixing to obtain a modifier;

s3, dropwise adding the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 40, stirring for 2-4 h, adjusting the pH value to 9 with ammonia water, and continuously stirring at constant temperature for 1.5h to obtain the nano modified gelatin.

The preparation method of the easy-decontamination high-abrasion-resistance synthetic leather for the sofa comprises the following steps:

(1) melting and blending the waterborne polyurethane, the N, N-dimethylformamide, the superfine lignin and the nano calcium carbonate in parts by weight, and extruding the mixture by a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane film sheet; compounding and molding the polyurethane film with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank bottom for the sofa;

(2) mixing the aqueous polyurethane emulsion and the acrylic acid mixture in parts by weight, fully stirring and uniformly mixing, then adding the dodecafluoroheptyl methacrylate and the initiator in parts by weight, and fully polymerizing, dispersing and emulsifying to obtain a modified aqueous polyurethane emulsion;

(3) mixing and grinding the nano filler and the nano modified gelatin in parts by weight, uniformly stirring and mixing the mixture with the modified waterborne polyurethane emulsion obtained in the step (2), adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling wear-resistant slurry;

(4) and (3) coating the anti-fouling wear-resistant slurry obtained in the step (3) on the bottom surface of the polyurethane synthetic leather blank for the sofa obtained in the step (1) through a coating process, and drying, cooling and drying to obtain the soil-release high-wear-resistant synthetic leather for the sofa.

In the step (4), the coating procedure is that the anti-fouling and wear-resistant coating obtained in the step (3) is uniformly sprayed on the bottom surface of the sofa polyurethane synthetic leather blank obtained in the step (1) through a pressurized spraying device; the coating weight was 28 g/m.

Example 6

Easy-to-clean high-wear-resistance synthetic leather for sofa and preparation method thereof

The easy-to-clean high-wear-resistance synthetic leather for the sofa is prepared by coating anti-fouling wear-resistance slurry on the surface of a polyurethane synthetic leather blank for the sofa; the polyurethane synthetic leather blank bottom for the sofa is formed by compounding a polyurethane film sheet and base cloth, and the polyurethane film sheet is formed by extruding polyurethane slurry through a T-shaped tape casting head; the polyurethane slurry comprises the following raw materials in parts by weight: 90 parts of waterborne polyurethane, 45 parts of N, N-dimethylformamide, 5-10 parts of superfine lignin and 28 parts of nano calcium carbonate.

The anti-fouling wear-resistant slurry comprises the following raw materials in parts by weight: 60 parts of aqueous polyurethane emulsion, 25 parts of acrylate mixture, 10 parts of dodecafluoroheptyl methacrylate, 3 parts of initiator, 15 parts of nano filler, 12 parts of nano modified gelatin and 6 parts of thickener. The acrylic ester mixture is a mixture of methyl methacrylate and butyl methacrylate according to the mass ratio of 2: 1; the nano filler is a combination of nano calcium carbonate, nano titanium dioxide and nano silicon dioxide; the grain diameter of the nano filler is less than or equal to 200 nm.

The preparation method of the nano modified gelatin comprises the following steps:

s1, adding gelatin into water, and uniformly dispersing to obtain a gelatin solution with the concentration of 20%; adding a hydrochloric acid solution with the concentration of 1mol/L into a gelatin solution, stopping adding when the pH value is 5, and stirring and dispersing uniformly to obtain a mixed solution;

s2, dissolving titanium alcohol ester in absolute ethyl alcohol, stirring until the titanium alcohol ester is completely dissolved, adding acetylacetone, heating to 45 ℃, and fully stirring and uniformly mixing to obtain a modifier;

s3, dropwise adding the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 45 ℃, stirring for 2-4 h, adjusting the pH value to 9.5 by ammonia water, and continuously stirring at constant temperature for 1.5h to obtain the nano modified gelatin.

The preparation method of the easy-decontamination high-abrasion-resistance synthetic leather for the sofa comprises the following steps:

(1) melting and blending the waterborne polyurethane, the N, N-dimethylformamide, the superfine lignin and the nano calcium carbonate in parts by weight, and extruding the mixture by a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane film sheet; compounding and molding the polyurethane film with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank bottom for the sofa;

(2) mixing the aqueous polyurethane emulsion and the acrylic acid mixture in parts by weight, fully stirring and uniformly mixing, then adding the dodecafluoroheptyl methacrylate and the initiator in parts by weight, and fully polymerizing, dispersing and emulsifying to obtain a modified aqueous polyurethane emulsion;

(3) mixing and grinding the nano filler and the nano modified gelatin in parts by weight, uniformly stirring and mixing the mixture with the modified waterborne polyurethane emulsion obtained in the step (2), adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling wear-resistant slurry;

(4) and (3) coating the anti-fouling wear-resistant slurry obtained in the step (3) on the bottom surface of the polyurethane synthetic leather blank for the sofa obtained in the step (1) through a coating process, and drying, cooling and drying to obtain the soil-release high-wear-resistant synthetic leather for the sofa.

In the step (4), the coating procedure is that the anti-fouling and wear-resistant coating obtained in the step (3) is uniformly sprayed on the bottom surface of the sofa polyurethane synthetic leather blank obtained in the step (1) through a pressurized spraying device; the coating weight was 30 g/m.

Comparative example 1

Compared with example 3, the difference is that the raw materials of the anti-fouling and wear-resisting slurry lack acrylate mixture and dodecafluoroheptyl methacrylate.

Comparative example 2

Compared with example 3, the difference is that the raw materials of the anti-fouling and wear-resisting slurry lack the nano-modified gelatin.

Test examples

In order to determine the performance of the soil-release high-wear-resistance synthetic leather for the sofa prepared by the invention, the soil-release high-wear-resistance synthetic leather for the sofa prepared in examples 1 to 6 and the soil-release high-wear-resistance synthetic leather for the sofa prepared in comparative examples 1 and 2 are respectively subjected to performance tests:

(1) and (3) testing the wear resistance of the synthetic leather: according to GB/T3920-2008 'color fastness test of textiles-rubbing color fastness', an HT-1004 Martindale abrasion resistance tester is adopted to test, and the effective size diameter of a test sample is 2.8 cm.

The test results are shown in tables 1 and 2:

TABLE 1

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Wear resistance/time

2.5 ten thousand

2.8 ten thousand

2.8 ten thousand

2.6 ten thousand

2.7 ten thousand

2.8 ten thousand

TABLE 2

	Example 3	Comparative example 1	Comparative example 2
				Wear resistance/time	2.8 ten thousand	1.5 ten thousand	1.3 ten thousand

(2) And (3) testing the wear resistance of the synthetic leather: setting the effective size of the sample with the outer diameter of 108cm and the inner diameter of 8mm, and measuring the wear resistance of the synthetic leather product by using a TABER wear resistance tester.

The test results are shown in table 3:

TABLE 3

	Example 1	Example 2	Example 3	Example 4	Example 5	Example 6
							Wear resistance/time	1900	2000	2100	2000	1900	2000

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.