CN113863017B - Easy-to-decontaminate high-wear-resistance synthetic leather for sofa and preparation method thereof - Google Patents
Easy-to-decontaminate high-wear-resistance synthetic leather for sofa and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-wear-resistance synthetic leather easy to decontaminate for a sofa and a preparation method thereof; the high-wear-resistance synthetic leather easy to decontaminate for the sofa is prepared by coating anti-fouling wear-resistant slurry on the bottom 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 membrane and base cloth, and the polyurethane membrane is formed by extruding polyurethane slurry through a T-shaped 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 superfine lignin and 10-28 parts of nano calcium carbonate. The synthetic leather prepared by the invention has the style and appearance of natural leather, soft hand feeling, high wear resistance and air permeability, and the surface of a synthetic leather product is easy to clean by coating the anti-fouling and wear-resistant slurry on the bottom surface of the synthetic leather blank, so that the synthetic leather does not occupy stains, and the anti-fouling and wear-resistant slurry has high adhesion with the bottom surface of the synthetic leather blank, excellent wear resistance and long service life.
Description
Technical Field
The invention relates to the technical field of synthetic leather, in particular to easy-to-decontaminate high-wear-resistance synthetic leather for a sofa and a preparation method thereof.
Background
Natural leather is widely used by people for producing daily necessities and industrial goods due to its excellent natural characteristics, but as the world population grows, the demand of human beings for leather is multiplied, and the limited number of natural leather has not been able to meet the demand of people. To meet the requirements of people on leather, scientists research and develop artificial leather and synthetic leather. The polyurethane synthetic leather has the advantages of soft and natural luster, soft hand feeling, strong leather feeling, excellent mechanical properties such as excellent bonding property with a base material, wear resistance, flex resistance, aging resistance and the like, and 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 industries such as clothing, shoemaking industry, bags, furniture and the like.
Chinese patent CN101748607A discloses a preparation method of synthetic leather for easy-to-decontaminate high-wear-resistance durable 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 two-liquid polyurethane resin, 1.5-2.5 parts by weight of cross-linking agent, 10 parts by weight of antifouling treatment agent and 30-45 parts by weight of dimethylformamide; the surface of the obtained synthetic leather for sofa furniture has the property of being easy to wipe 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 is not yellowing-resistant, the use of the antifouling treatment agent has little effect on the decontamination and dirt resistance of leather, and the wear resistance of the synthetic leather for sofa furniture is still to be further improved.
Chinese patent CN108914608A discloses a frosted easy-to-decontaminate high-grade sofa leather, which sequentially comprises a fabric bottom layer, a fabric layer, a surface layer and a finishing 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 and is compounded with the fabric bottom layer and the fabric layer through the adhesive layer, the surface layer is a dry type 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 layer is 0.2mm; the coating layer is a coating of a soil release material. According to the patent, the surface of the surface layer is coated with the coating of the soil release material, so that leather is brighter and more dirt-resistant, but the bottom layer of the fabric is compounded with the fabric through the viscose layer, so that the hand feeling of the sofa leather can be affected to a certain extent, and the wear resistance of the sofa leather is poor due to the coating of the soil release material on the surface of the sofa leather.
Disclosure of Invention
In view of the above, the present invention provides a synthetic leather with easy decontamination and high wear resistance for sofa and a preparation method thereof, so as to solve the above 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-pollution wear-resistant slurry on the bottom 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 membrane and base cloth, and the polyurethane membrane is formed by extruding polyurethane slurry through a T-shaped 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 superfine 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: 35-60 parts of aqueous polyurethane emulsion, 15-25 parts of acrylate mixture, 5-10 parts of dodecafluoroheptyl methacrylate, 1-3 parts of initiator, 5-15 parts of nano filler, 6-12 parts of nano modified gelatin and 2-6 parts of thickener.
More preferably, the anti-fouling and wear-resistant slurry comprises the following raw materials in parts by weight: 40-55 parts of aqueous polyurethane emulsion, 18-22 parts of acrylate mixture, 6-8 parts of dodecafluoroheptyl methacrylate, 1.5-2.5 parts of initiator, 8-12 parts of nano filler, 8-10 parts of nano modified gelatin and 3-5 parts of thickener.
More preferably, the anti-fouling and 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.
More preferably, the acrylate mixture is a mixture composed of methyl methacrylate and butyl methacrylate according to a mass ratio of 1-2:1.
More preferably, the nano filler is any one or more than two of nano calcium carbonate, nano titanium dioxide, nano silicon dioxide and nano zinc dioxide; the particle size of the nano filler is less than or equal to 200nm.
More preferably, the preparation method of the nano modified gelatin comprises the following steps:
s1, adding gelatin into water to uniformly disperse to prepare 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 uniformly stirring and dispersing to obtain a mixed solution;
s2, dissolving titanium alkoxide in absolute ethyl alcohol, stirring until the titanium alkoxide is completely dissolved, adding acetylacetone, heating to 30-45 ℃, and fully stirring and uniformly mixing to obtain a modifier;
and S3, dripping the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 30-45 ℃, stirring for 2-4 hours, regulating the pH value to 8-9.5 by ammonia water, and continuously stirring at constant temperature for 1-1.5 hours to obtain the nano modified gelatin.
The invention further aims to provide a preparation method of the easy-to-clean high-wear-resistance synthetic leather for the sofa, which comprises the following steps of:
(1) Melting and blending the water-based polyurethane, N-dimethylformamide, superfine lignin and nano calcium carbonate in parts by weight, and extruding the mixture through a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane membrane; the polyurethane membrane is compounded and formed with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank for the sofa;
(2) Mixing the water-based polyurethane emulsion with the acrylic acid mixture, fully stirring and uniformly mixing, adding the dodecafluoroheptyl methacrylate and the initiator in the weight parts, and fully polymerizing, dispersing and emulsifying to obtain a modified water-based polyurethane emulsion;
(3) Mixing and grinding the nano filler and the nano modified gelatin in parts by weight, uniformly stirring and mixing the nano filler and the modified aqueous polyurethane emulsion obtained in the step (2), and then adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling and wear-resistant slurry;
(4) And (3) coating the anti-fouling and 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 high wear-resistant synthetic leather for the sofa.
Preferably, in the step (4), the coating process is to uniformly spray the anti-fouling and 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 pressurized spraying device; the coating weight is 20 g/m-30 g/m.
From the technical scheme, the beneficial effects of the invention are as follows:
(1) The synthetic leather with easy decontamination and high wear resistance for sofa has the style and appearance of natural leather, soft hand feeling, high wear resistance and air permeability, and the surface of the synthetic leather product is easy to clean by coating the anti-fouling and wear-resistant slurry on the bottom surface of the synthetic leather blank, does not occupy stains, and has high cohesiveness between the anti-fouling and wear-resistant slurry and the bottom surface of the synthetic leather blank, excellent wear resistance and long service life.
(2) The characteristics of polyurethane slurry coated on the surface of the synthetic leather in the easy-to-clean and high-wear-resistance synthetic leather for the sofa are greatly dependent on the performances of polyurethane resin, the waterborne polyurethane has better hardness and chemical stability, but does not resist yellowing, the waterborne polyurethane emulsion is modified, and the modified waterborne polyurethane emulsion has excellent surface performances, so that the synthetic leather surface has the characteristics of toughness, high elasticity and high wear resistance of polyurethane, and also has the advantages of good weather resistance of acrylic ester, high thermal stability and the like, and meanwhile, the waterborne polyurethane emulsion also has super weather resistance, chemical corrosion resistance and water resistance of fluorine-containing compounds.
(3) The nano modified gelatin is added into the anti-fouling and 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 certain antibacterial property; the addition of the nano filler can improve the wear resistance of the synthetic leather; has good bonding effect with synthetic leather and excellent water resistance, heat resistance and flexibility.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments, in order to make the objects, technical solutions and advantages of the present invention more apparent. The exemplary embodiments of the present invention and the descriptions thereof are used herein to explain the present invention, but are not intended to limit the invention.
Example 1
Easy-to-decontaminate high-wear-resistance synthetic leather for sofa and preparation method thereof
The easy-to-clean and high-wear-resistant synthetic leather for the sofa is prepared by coating anti-pollution and wear-resistant slurry on the bottom 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 membrane and base cloth, and the polyurethane membrane is formed by extruding polyurethane slurry through a T-shaped 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 composed of methyl methacrylate and butyl methacrylate according to a mass ratio of 1:1; the nano filler is nano calcium carbonate; the particle size of the nano filler is less than or equal to 200nm.
The preparation method of the nano modified gelatin comprises the following steps:
s1, adding gelatin into water to uniformly disperse to prepare 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 uniformly stirring and dispersing to obtain a mixed solution;
s2, dissolving titanium alkoxide in absolute ethyl alcohol, stirring until the titanium alkoxide is completely dissolved, adding acetylacetone, heating to 30 ℃, and fully stirring and uniformly mixing to obtain a modifier;
and S3, dripping the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 30 ℃, stirring for 2 hours, regulating the pH value to 8 by using ammonia water, and continuing constant-temperature stirring for 1 hour to obtain the nano modified gelatin.
The preparation method of the easy-to-clean high-wear-resistance synthetic leather for the sofa comprises the following steps of:
(1) Melting and blending the water-based polyurethane, N-dimethylformamide, superfine lignin and nano calcium carbonate in parts by weight, and extruding the mixture through a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane membrane; the polyurethane membrane is compounded and formed with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank for the sofa;
(2) Mixing the above aqueous polyurethane emulsion with the above acrylic acid mixture, stirring and mixing thoroughly, adding the above dodecafluoroheptyl methacrylate and initiator, polymerizing and dispersing thoroughly to obtain 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 nano filler and the modified aqueous polyurethane emulsion obtained in the step (2), and then adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling and wear-resistant slurry;
(4) And (3) coating the anti-fouling and 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 high wear-resistant synthetic leather for the sofa.
In the step (4), the coating process is that the sprayed anti-fouling and wear-resistant 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 was 20g/m.
Example 2
Easy-to-decontaminate high-wear-resistance synthetic leather for sofa and preparation method thereof
The easy-to-clean and high-wear-resistant synthetic leather for the sofa is prepared by coating anti-pollution and wear-resistant slurry on the bottom 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 membrane and base cloth, and the polyurethane membrane is formed by extruding polyurethane slurry through a T-shaped 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 composed of methyl methacrylate and butyl methacrylate according to the mass ratio of 1.2:1; the nano-filler is a combination of nano-calcium carbonate and nano-titanium dioxide; the particle size of the nano filler is less than or equal to 200nm.
The preparation method of the nano modified gelatin comprises the following steps:
s1, adding gelatin into water to uniformly disperse to prepare 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 uniformly stirring and dispersing to obtain a mixed solution;
s2, dissolving titanium alkoxide in absolute ethyl alcohol, stirring until the titanium alkoxide is completely dissolved, adding acetylacetone, heating to 35 ℃, and fully stirring and uniformly mixing to obtain a modifier;
and S3, dripping the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 35 ℃, stirring for 2 hours, regulating the pH value to 8 by using ammonia water, and continuing constant-temperature stirring for 1 hour to obtain the nano modified gelatin.
The preparation method of the easy-to-clean high-wear-resistance synthetic leather for the sofa comprises the following steps of:
(1) Melting and blending the water-based polyurethane, N-dimethylformamide, superfine lignin and nano calcium carbonate in parts by weight, and extruding the mixture through a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane membrane; the polyurethane membrane is compounded and formed with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank for the sofa;
(2) Mixing the above aqueous polyurethane emulsion with the above acrylic acid mixture, stirring and mixing thoroughly, adding the above dodecafluoroheptyl methacrylate and initiator, polymerizing and dispersing thoroughly to obtain 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 nano filler and the modified aqueous polyurethane emulsion obtained in the step (2), and then adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling and wear-resistant slurry;
(4) And (3) coating the anti-fouling and 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 high wear-resistant synthetic leather for the sofa.
In the step (4), the coating process is that the sprayed anti-fouling and wear-resistant 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 was 25g/m.
Example 3
Easy-to-decontaminate high-wear-resistance synthetic leather for sofa and preparation method thereof
The easy-to-clean and high-wear-resistant synthetic leather for the sofa is prepared by coating anti-pollution and wear-resistant slurry on the bottom 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 membrane and base cloth, and the polyurethane membrane is formed by extruding polyurethane slurry through a T-shaped 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 composed of methyl methacrylate and butyl methacrylate according to a 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 particle size of the nano filler is less than or equal to 200nm.
The preparation method of the nano modified gelatin comprises the following steps:
s1, adding gelatin into water to uniformly disperse to prepare 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 uniformly stirring and dispersing to obtain a mixed solution;
s2, dissolving titanium alkoxide in absolute ethyl alcohol, stirring until the titanium alkoxide is completely dissolved, adding acetylacetone, heating to 45 ℃, and fully stirring and uniformly mixing to obtain a modifier;
and S3, dripping the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 45 ℃, stirring for 2-4 hours, regulating the pH value to 9 by using ammonia water, and continuously stirring at constant temperature for 1.5 hours to obtain the nano modified gelatin.
The preparation method of the easy-to-clean high-wear-resistance synthetic leather for the sofa comprises the following steps of:
(1) Melting and blending the water-based polyurethane, N-dimethylformamide, superfine lignin and nano calcium carbonate in parts by weight, and extruding the mixture through a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane membrane; the polyurethane membrane is compounded and formed with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank for the sofa;
(2) Mixing the above aqueous polyurethane emulsion with the above acrylic acid mixture, stirring and mixing thoroughly, adding the above dodecafluoroheptyl methacrylate and initiator, polymerizing and dispersing thoroughly to obtain 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 nano filler and the modified aqueous polyurethane emulsion obtained in the step (2), and then adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling and wear-resistant slurry;
(4) And (3) coating the anti-fouling and 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 high wear-resistant synthetic leather for the sofa.
In the step (4), the coating process is that the sprayed anti-fouling and wear-resistant 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 was 30g/m.
Example 4
Easy-to-decontaminate high-wear-resistance synthetic leather for sofa and preparation method thereof
The easy-to-clean and high-wear-resistant synthetic leather for the sofa is prepared by coating anti-pollution and wear-resistant slurry on the bottom 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 membrane and base cloth, and the polyurethane membrane is formed by extruding polyurethane slurry through a T-shaped 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 acrylic ester mixture is a mixture composed of methyl methacrylate and butyl methacrylate according to a mass ratio of 1-2:1; the nano-filler is a combination of nano-titanium dioxide and nano-zinc dioxide; the particle size of the nano filler is less than or equal to 200nm.
The preparation method of the nano modified gelatin comprises the following steps:
s1, adding gelatin into water to uniformly disperse to prepare 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 uniformly stirring and dispersing to obtain a mixed solution;
s2, dissolving titanium alkoxide in absolute ethyl alcohol, stirring until the titanium alkoxide is completely dissolved, adding acetylacetone, heating to 40 ℃, and fully stirring and uniformly mixing to obtain a modifier;
and S3, dripping the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 40 ℃, stirring for 2-4 hours, regulating the pH value to 8-9.5 by using ammonia water, and continuously stirring at constant temperature for 1.5 hours to obtain the nano modified gelatin.
The preparation method of the easy-to-clean high-wear-resistance synthetic leather for the sofa comprises the following steps of:
(1) Melting and blending the water-based polyurethane, N-dimethylformamide, superfine lignin and nano calcium carbonate in parts by weight, and extruding the mixture through a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane membrane; the polyurethane membrane is compounded and formed with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank for the sofa;
(2) Mixing the above aqueous polyurethane emulsion with the above acrylic acid mixture, stirring and mixing thoroughly, adding the above dodecafluoroheptyl methacrylate and initiator, polymerizing and dispersing thoroughly to obtain 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 nano filler and the modified aqueous polyurethane emulsion obtained in the step (2), and then adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling and wear-resistant slurry;
(4) And (3) coating the anti-fouling and 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 high wear-resistant synthetic leather for the sofa.
In the step (4), the coating process is that the sprayed anti-fouling and wear-resistant 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 was 25g/m.
Example 5
Easy-to-decontaminate high-wear-resistance synthetic leather for sofa and preparation method thereof
The easy-to-clean and high-wear-resistant synthetic leather for the sofa is prepared by coating anti-pollution and wear-resistant slurry on the bottom 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 membrane and base cloth, and the polyurethane membrane is formed by extruding polyurethane slurry through a T-shaped 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 composed 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 particle size of the nano filler is less than or equal to 200nm.
The preparation method of the nano modified gelatin comprises the following steps:
s1, adding gelatin into water to uniformly disperse to prepare 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 4.5, and uniformly stirring and dispersing to obtain a mixed solution;
s2, dissolving titanium alkoxide in absolute ethyl alcohol, stirring until the titanium alkoxide is completely dissolved, adding acetylacetone, heating to 40 ℃, and fully stirring and uniformly mixing to obtain a modifier;
and S3, dripping the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 40, stirring for 2-4 hours, regulating the pH value to 9 by using ammonia water, and continuously stirring at constant temperature for 1.5 hours to obtain the nano modified gelatin.
The preparation method of the easy-to-clean high-wear-resistance synthetic leather for the sofa comprises the following steps of:
(1) Melting and blending the water-based polyurethane, N-dimethylformamide, superfine lignin and nano calcium carbonate in parts by weight, and extruding the mixture through a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane membrane; the polyurethane membrane is compounded and formed with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank for the sofa;
(2) Mixing the above aqueous polyurethane emulsion with the above acrylic acid mixture, stirring and mixing thoroughly, adding the above dodecafluoroheptyl methacrylate and initiator, polymerizing and dispersing thoroughly to obtain 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 nano filler and the modified aqueous polyurethane emulsion obtained in the step (2), and then adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling and wear-resistant slurry;
(4) And (3) coating the anti-fouling and 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 high wear-resistant synthetic leather for the sofa.
In the step (4), the coating process is that the sprayed anti-fouling and wear-resistant 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 was 28g/m.
Example 6
Easy-to-decontaminate high-wear-resistance synthetic leather for sofa and preparation method thereof
The easy-to-clean and high-wear-resistant synthetic leather for the sofa is prepared by coating anti-pollution and wear-resistant slurry on the bottom 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 membrane and base cloth, and the polyurethane membrane is formed by extruding polyurethane slurry through a T-shaped 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 ultrafine 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 composed of methyl methacrylate and butyl methacrylate according to a mass ratio of 2:1; the nano-filler is a combination of nano-calcium carbonate, nano-titanium dioxide and nano-silicon dioxide; the particle size of the nano filler is less than or equal to 200nm.
The preparation method of the nano modified gelatin comprises the following steps:
s1, adding gelatin into water to uniformly disperse to prepare 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 uniformly stirring and dispersing to obtain a mixed solution;
s2, dissolving titanium alkoxide in absolute ethyl alcohol, stirring until the titanium alkoxide is completely dissolved, adding acetylacetone, heating to 45 ℃, and fully stirring and uniformly mixing to obtain a modifier;
and S3, dripping the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 45 ℃, stirring for 2-4 hours, regulating the pH value to 9.5 by using ammonia water, and continuously stirring at constant temperature for 1.5 hours to obtain the nano modified gelatin.
The preparation method of the easy-to-clean high-wear-resistance synthetic leather for the sofa comprises the following steps of:
(1) Melting and blending the water-based polyurethane, N-dimethylformamide, superfine lignin and nano calcium carbonate in parts by weight, and extruding the mixture through a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane membrane; the polyurethane membrane is compounded and formed with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank for the sofa;
(2) Mixing the above aqueous polyurethane emulsion with the above acrylic acid mixture, stirring and mixing thoroughly, adding the above dodecafluoroheptyl methacrylate and initiator, polymerizing and dispersing thoroughly to obtain 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 nano filler and the modified aqueous polyurethane emulsion obtained in the step (2), and then adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling and wear-resistant slurry;
(4) And (3) coating the anti-fouling and 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 high wear-resistant synthetic leather for the sofa.
In the step (4), the coating process is that the sprayed anti-fouling and wear-resistant 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 was 30g/m.
Comparative example 1
The difference compared to example 3 is that the raw material of the anti-fouling and wear-resistant slurry lacks the acrylate mixture, dodecafluoroheptyl methacrylate.
Comparative example 2
The difference compared to example 3 is the lack of nano-modified gelatin in the raw material of the anti-fouling and wear-resistant slurry.
Test examples
In order to determine the performances of the easy-to-clean and high-wear-resistant synthetic leather for sofas prepared by the invention, the easy-to-clean and high-wear-resistant synthetic leather for sofas prepared by examples 1-6, and the easy-to-clean and high-wear-resistant synthetic leather for sofas prepared by comparative examples 1 and 2 are subjected to performance tests respectively:
(1) Abrasion resistance test of synthetic leather: according to GB/T3920-2008 "textile color fastness test- -rubbing color fastness", an HT-1004 Martindale abrasion resistance instrument is adopted for testing, and the effective size diameter of a sample is 2.8cm.
The test results are shown in tables 1 and 2:
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | |
| Abrasion resistance/times | 2.5 ten thousand | 2.8 thousands of | 2.8 thousands of | 2.6 ten thousand | 2.7 ten thousand | 2.8 thousands of |
TABLE 2
| Example 3 | Comparative example 1 | Comparative example 2 | |
| Abrasion resistance/times | 2.8 thousands of | 1.5 ten thousand | 1.3 thousands of |
(2) And (3) testing the wear resistance of the synthetic leather: the effective size of the sample is set to have an outer diameter of 108cm and an inner diameter of 8mm, and the wear resistance of the synthetic leather product is measured by a TABER wear resistance tester.
The test results are shown in table 3:
TABLE 3 Table 3
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | |
| Abrasion resistance/secondary | 1900 | 2000 | 2100 | 2000 | 1900 | 2000 |
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations can be made to the embodiments of the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The easy-to-clean and high-wear-resistant synthetic leather for the sofa is characterized by being prepared by coating anti-pollution and wear-resistant slurry on the bottom 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 membrane and base cloth, and the polyurethane membrane is formed by extruding polyurethane slurry through a T-shaped 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 superfine lignin and 10-28 parts of nano calcium carbonate;
the anti-fouling wear-resistant slurry comprises the following raw materials in parts by weight: 35-60 parts of aqueous polyurethane emulsion, 15-25 parts of acrylate mixture, 5-10 parts of dodecafluoroheptyl methacrylate, 1-3 parts of initiator, 5-15 parts of nano filler, 6-12 parts of nano modified gelatin and 2-6 parts of thickener;
the preparation method of the nano modified gelatin comprises the following steps:
s1, adding gelatin into water to uniformly disperse to prepare 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 uniformly stirring and dispersing to obtain a mixed solution;
s2, dissolving titanium alkoxide in absolute ethyl alcohol, stirring until the titanium alkoxide is completely dissolved, adding acetylacetone, heating to 30-45 ℃, and fully stirring and uniformly mixing to obtain a modifier;
and S3, dripping the modifier obtained in the step S2 into the mixed solution obtained in the step S1, heating to 30-45 ℃, stirring for 2-4 hours, regulating the pH value to 8-9.5 by ammonia water, and continuously stirring at constant temperature for 1-1.5 hours to obtain the nano modified gelatin.
2. The soil release and high wear resistant synthetic leather for sofa according to claim 1, wherein the soil release and 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.
3. The synthetic leather with easy decontamination and high wear resistance for sofa according to claim 1, wherein the acrylic ester mixture is a mixture composed of methyl methacrylate and butyl methacrylate according to a mass ratio of 1-2:1.
4. The synthetic leather with easy decontamination and high wear resistance for sofa according to claim 1, wherein the nano filler is any one or more than two of nano calcium carbonate, nano titanium dioxide, nano silicon dioxide and nano zinc dioxide; the particle size of the nano filler is less than or equal to 200nm.
5. The method for preparing the high-wear-resistance synthetic leather easy to decontaminate for the sofa according to any one of claims 1 to 4, which is characterized by comprising the following steps:
(1) Melting and blending the water-based polyurethane, N-dimethylformamide, superfine lignin and nano calcium carbonate in parts by weight, and extruding the mixture through a double-screw extruder to obtain polyurethane slurry; extruding and molding the polyurethane slurry through a T-shaped casting head to obtain a polyurethane membrane; the polyurethane membrane is compounded and formed with the base cloth through an embossing wheel to obtain a polyurethane synthetic leather blank for the sofa;
(2) Mixing the water-based polyurethane emulsion with the acrylic acid mixture, fully stirring and uniformly mixing, adding the dodecafluoroheptyl methacrylate and the initiator in the weight parts, and fully polymerizing, dispersing and emulsifying to obtain a modified water-based polyurethane emulsion;
(3) Mixing and grinding the nano filler and the nano modified gelatin in parts by weight, uniformly stirring and mixing the nano filler and the modified aqueous polyurethane emulsion obtained in the step (2), and then adding the thickener in parts by weight, and fully and uniformly mixing to obtain the anti-fouling and wear-resistant slurry;
(4) And (3) coating the anti-fouling and 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 high wear-resistant synthetic leather for the sofa.
6. The method for preparing the high wear-resistant synthetic leather easy to decontaminate for sofas, which is characterized in that in the step (4), the coating process is that the sprayed anti-fouling wear-resistant slurry obtained in the step (3) is uniformly sprayed on the bottom surface of the polyurethane synthetic leather blank for sofas, obtained in the step (1) through a pressurized spraying device; the coating weight is 20 g/m-30 g/m.
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