Soft crease-resistant solvent-free polyurethane synthetic leather for sofa home furnishing and preparation method of soft crease-resistant solvent-free polyurethane synthetic leather

Abstract

The invention relates to soft crease-resistant solvent-free polyurethane synthetic leather for sofa home furnishing.The soft crease-resistant solvent-free polyurethane synthetic leather for the sofa home furnishing.The soft crease-resistant solvent-free polyurethane synthetic leather for the sofa home furnishing.The soft crease-resistant solvent-free polyurethane synthetic leather for the sofa home furnishingcomprises a water-based surface layer, a polyurethane middle layer, a solvent-free composite bonding layer and a base cloth layer which are sequentially arranged from top to bottom; the solvent-free composite bonding layer is prepared from solvent-free composite bonding layer slurry consisting of the following components: polyol, a metal catalyst, isocyanate, lignocellulose, white carbon black and foaming powder. The formula of the solvent-free bonding layer is innovated, the lignocellulose and the foaming powder are added, and the defects of hard hand feeling and strong plastic feeling of finished leather can be obviously improved by utilizing the synergistic effect of the porous structure of the lignocellulose, physical foaming of the foaming powder and solvent-free chemical foaming; the white carbon black has high specific surface area and excellent reinforcing performance, so that the strength of polyurethane can be effectively improved, and the crease resistance and impact resistance of the product can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of synthetic leather, in particular to a soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and furniture and a preparation method thereof. Background Art

[0002] Solvent-free polyurethane synthetic leather for sofas and home furnishings is favored by the market because of its good leather feel and durability. Its advantage is that no harmful solvents are used in the production process, which makes it safer and more eco-friendly than traditional solvent-based polyurethane synthetic leather. In addition, compared with water-based polyurethane synthetic leather, solvent-free polyurethane synthetic leather is more energy-saving and environmentally friendly in the production process. Although solvent-free polyurethane synthetic leather has many advantages, it has certain limitations in feel, such as strong plastic feel and hard feel. These factors limit its widespread promotion and application. The research and development of solvent-free polyurethane synthetic leather is constantly advancing, and it is urgent to actively explore ways to improve its softness and feel. Summary of the invention

[0003] Based on this, in view of the technical problem that the current solvent-free polyurethane synthetic leather has certain limitations in feel, which restricts its wide promotion and application, the purpose of the present invention is to provide a soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings and a preparation method thereof, so as to achieve an environmentally friendly soft sofa and home furnishing leather with plump and soft feel, crease resistance and good durability, to solve the defects of the currently commercially available environmentally friendly or solvent-free polyurethane synthetic leather, which generally have a hard feel, a strong plastic feel and poor physical properties, and to solve the problems of bar marks, pits and indentations of soft products during storage and transportation.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The invention provides a soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings, which comprises a water-based surface layer, a polyurethane middle layer, a solvent-free composite adhesive layer and a base fabric layer which are sequentially arranged from top to bottom, wherein the solvent-free composite adhesive layer is prepared from a solvent-free composite adhesive layer slurry composed of the following components: polyol, metal catalyst, isocyanate, wood cellulose, white carbon black and foaming powder.

[0006] The present invention innovates the formula of the solvent-free adhesive layer. By adding wood cellulose and foaming powder, the porous structure of wood cellulose, the synergistic effect of physical foaming of foaming powder and solvent-free chemical foaming can be used to significantly improve the defects of hard hand feel and strong plastic feel of finished leather. White carbon black has a high specific surface area and excellent reinforcing performance, which can effectively improve the strength of polyurethane and is beneficial to improving the crease resistance and impact resistance of the product.

[0007] As a further improvement of the above solution of the present invention, the lignocellulose is silanized modified lignocellulose.

[0008] As a further improvement of the above solution of the present invention, the metal catalyst is an organic zinc-bismuth composite catalyst.

[0009] As a further improvement of the above scheme of the present invention, the weight proportions of the components in the solvent-free composite adhesive layer slurry are as follows: 100-140 parts of polyol, 0.2-0.3 parts of metal catalyst, 50-70 parts of isocyanate, 10-20 parts of wood cellulose, 0.5-2 parts of white carbon black, and 0.5-1.5 parts of foaming powder.

[0010] As a further improvement of the above-mentioned scheme of the present invention, the aqueous surface layer is prepared from an aqueous surface layer slurry composed of the following components in parts by weight: 140-180 parts of aqueous polyether polyurethane dispersion, 0.5-1 part of leveling agent, 2-5 parts of curing cross-linking agent, 2-6 parts of wear-resistant additive, 0.2-0.5 part of wetting agent, 3-15 parts of pigment paste, and 20-50 parts of deionized water.

[0011] As a further improvement of the above-mentioned scheme of the present invention, the polyurethane intermediate layer is prepared from a polyurethane intermediate layer slurry composed of the following components in parts by weight: 100 parts of soft polycarbon polyether high-solid polyurethane, 0.2-0.5 parts of foaming agent, 2-5 parts of curing cross-linking agent, 0.5-1.5 parts of foaming powder, and 3-8 parts of pigment paste.

[0012] As a further improvement of the above solution of the present invention, the base fabric layer is made of recyclable polyester fiber, with a thickness of 1.2±0.05mm and a gram weight of 320±30g / cm 2 .

[0013] As a further improvement of the above solution of the present invention, the water-based polyether polyurethane dispersion is a water-based resin GW-1027M.

[0014] The present invention provides a method for preparing the soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings, comprising the following steps:

[0015] S1. Coating the aqueous surface slurry on the release paper and drying to obtain an aqueous surface layer;

[0016] S2. Coating a polyurethane intermediate layer slurry on the aqueous surface layer and drying to obtain a polyurethane intermediate layer;

[0017] S3. Coating a solvent-free composite adhesive layer slurry on the polyurethane intermediate layer and baking to a semi-dry state to obtain a solvent-free composite adhesive layer;

[0018] S4. After the solvent-free composite adhesive layer is bonded to the base fabric layer, dried and the release paper is peeled off, a soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings is obtained.

[0019] As a further improvement of the above scheme of the present invention, when coating the aqueous surface slurry, the coating blade gap is 10-15 wires;

[0020] and / or, when coating the polyurethane intermediate layer slurry, the coating blade gap is 20-25 wires;

[0021] And / or, when coating the solvent-free composite bonding layer slurry, the coating blade gap is 25-30 wires.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention innovates the formula of the solvent-free adhesive layer. By adding lignocellulose and foaming powder, the porous structure of lignocellulose, the physical foaming of the foaming powder and the synergistic effect of the solvent-free chemical foaming can be used to significantly improve the defects of the leather having a hard feel and a strong plastic feel. The white carbon black has a high specific surface area and excellent reinforcing performance, which can effectively improve the strength of the polyurethane, and is beneficial to improving the crease resistance and impact resistance of the product. The environmentally friendly soft sofa home leather with plumpness, softness, good crease resistance and good durability is prepared, which can achieve a hydrolysis resistance of 7-10 years, a hardness of 6mm, and a taber wear resistance of 5000 times.

[0024] 2. The soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and furniture provided by the present invention has a water-based surface layer with good wear resistance and delicate touch as the surface layer, and has a skin-friendly effect. The middle layer is a soft polycarbonate polyether high-solid polyurethane with an appropriate amount of foaming powder added, and its blocked isocyanate cross-linked film has a certain elasticity and fullness. The environmentally friendly soft sofa and furniture leather with full and soft feel, crease resistance and good durability is achieved, which solves the defects of the currently available environmentally friendly or solvent-free polyurethane synthetic leathers, such as hard feel, strong plastic feel and poor physical properties, and solves the problems of bar marks, pits and indentations of soft products during storage and transportation. DETAILED DESCRIPTION

[0025] For ease of understanding of the present invention, the present invention will be described more fully below in conjunction with specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] The specific information of the raw materials used in the following examples and comparative examples is as follows:

[0028] Water-based polyether polyurethane dispersion: water-based resin GW-1027M, produced by Changshu Jinshang Chemical Company;

[0029] Soft polycarbonate polyether high solid polyurethane AL-2015G, produced by Hefei Anli Polyurethane New Materials Co., Ltd.

[0030] The polyol was selected as the mixture Al-2020A, and the isocyanate was Al-5040B, produced by Hefei Anli Polyurethane New Materials Co., Ltd.

[0031] The wear-resistant additives are wear-resistant additive NS-APU2277 polyethylene wax powder and wear-resistant additive 3238, wherein the wear-resistant additive 3238 is produced by Shanghai Hersbit Chemical Co., Ltd., and the wear-resistant additive NS-APU2277 polyethylene wax powder is produced by Shanghai Nanshou Chemical Co., Ltd.;

[0032] The model of the leveling agent is LA-1610, produced by Starr Company;

[0033] The model of the uniform foaming agent is EP-P42, produced by Evonik;

[0034] The model of the curing crosslinking agent is XR-5580, produced by Starr Company;

[0035] The model of the wetting agent is LT-7110, produced by Hefei Anli Polyurethane New Materials Co., Ltd.;

[0036] The metal catalyst model is Kosmos MB 8, produced by Evonik;

[0037] Foaming powder ST-15, produced by Zhejiang Shuntai Rubber Technology Co., Ltd.

[0038] Lignocellulose, Nanjing Stebao Trading Co., Ltd.;

[0039] White carbon black A200, produced by Zhongbei Fine Chemicals;

[0040] Aluminum hydroxide, Shandong Taixing New Materials Co., Ltd.

[0041] It should be noted that the above raw material additives are only examples made to make the technical solution of the present invention clearer, and do not mean that the present invention can only use the above raw material additives. The specific scope is subject to the claims. In addition, the "parts", "number of parts", etc. mentioned in the following embodiments, unless otherwise specified, all refer to parts by weight.

[0042] Example 1

[0043] This embodiment provides a soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings, which comprises a four-layer structure of a water-based surface layer, a soft polycarbonate polyether high-solid polyurethane middle layer, a solvent-free composite adhesive layer and a base fabric layer arranged in sequence from top to bottom, and the specific preparation method thereof is as follows:

[0044] S1. Forming a water-based surface layer: Apply the water-based surface layer slurry that has been fully stirred and evacuated to a vacuum to the surface of the release paper, with a coating knife gap of 10-15 threads, and heat and dry at 100°C to obtain a water-based surface layer.

[0045] Among them, the weight proportions of each component in the water-based surface slurry are as follows: 140 parts of water-based resin GW-1027M, 0.5 parts of leveling agent LA-1610, 2 parts of curing cross-linking agent XR-5580, 4 parts of wear-resistant additive (NS-APU2277:3238=1:2), 0.2 parts of wetting agent LT-7110, 6 parts of pigment paste, and 20 parts of deionized water.

[0046] S2. Forming a soft polycarbon polyether high-solid polyurethane intermediate layer: applying the soft polycarbon polyether high-solid polyurethane intermediate layer slurry to the surface of the water-based surface layer, with a coating blade gap of 20-25 strands, and heating and drying at 120°C to obtain a soft polycarbon polyether high-solid polyurethane intermediate layer.

[0047] Among them, the weight proportions of each component in the soft polycarbon polyether high-solid polyurethane intermediate layer slurry are as follows: 100 parts of soft polycarbon polyether high-solid polyurethane AL-2015G, 0.2 parts of foaming agent EP-P42, 2 parts of curing crosslinking agent XR-5580, 0.5 parts of foaming powder ST-15, and 6 parts of pigment paste.

[0048] S3. Forming a solvent-free composite adhesive layer: applying the solvent-free composite adhesive layer slurry to the surface of the soft polycarbonate polyether high-solid polyurethane intermediate layer, with a coating head gap of 25-30 threads, preheating at 90°C until it is semi-dry, to obtain a solvent-free composite adhesive layer.

[0049] The weight percentages of the components in the solvent-free composite bonding layer slurry are as follows: 100 parts of polyol AL-2020A, 0.2 parts of metal catalyst Kosmos MB 8, 50 parts of isocyanate Al-5040B, 15 parts of wood cellulose, 1.5 parts of white carbon black A200, and 1 part of foaming powder ST-15.

[0050] S4. Laminating a 1.20 mm double-sided fleece base fabric to form a base fabric layer, with a lamination thickness of 0.90 mm. After aging and drying at 140° C. for 4 min, peeling off the release paper and rolling to obtain a polyurethane synthetic leather product.

[0051] Example 2

[0052] This embodiment provides a soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings, which comprises a four-layer structure of a water-based surface layer, a soft polycarbonate polyether high-solid polyurethane middle layer, a solvent-free composite adhesive layer and a base fabric layer arranged in sequence from top to bottom, and the specific preparation method thereof is as follows:

[0053] S1. Forming a water-based surface layer: Apply the water-based surface layer slurry that has been fully stirred and evacuated to a vacuum to the surface of the release paper, with a coating knife gap of 10-15 threads, and heat and dry at 100°C to obtain a water-based surface layer.

[0054] Among them, the weight proportions of each component in the water-based surface slurry are as follows: 160 parts of water-based resin GW-1027M, 0.8 parts of leveling agent LA-1610, 3 parts of curing cross-linking agent XR-5580, 5 parts of wear-resistant additive (NS-APU2277:3238=1:2), 0.3 parts of wetting agent LT-7110, 6 parts of pigment paste, and 30 parts of deionized water.

[0055] S2. Forming a soft polycarbon polyether high-solid polyurethane intermediate layer: applying the soft polycarbon polyether high-solid polyurethane intermediate layer slurry to the surface of the water-based surface layer, with a coating blade gap of 20-25 strands, and heating and drying at 100°C to obtain a soft polycarbon polyether high-solid polyurethane intermediate layer.

[0056] Among them, the weight proportions of each component in the soft polycarbonate polyether high-solid polyurethane intermediate layer slurry are as follows: 110 parts of soft polycarbonate polyether high-solid polyurethane AL-2015G, 0.4 parts of foaming agent EP-P42, 4 parts of curing crosslinking agent XR-5580, 1 part of foaming powder ST-15, and 6 parts of pigment paste.

[0057] S3. Forming a solvent-free composite adhesive layer: applying the solvent-free composite adhesive layer slurry to the surface of the soft polycarbonate polyether high-solid polyurethane intermediate layer, with a coating head gap of 25-30 threads, preheating at 90°C until it is semi-dry, to obtain a solvent-free composite adhesive layer.

[0058] The weight percentages of the components in the solvent-free composite bonding layer slurry are as follows: 100 parts of polyol AL-2020A, 0.2 parts of metal catalyst Kosmos MB 8, 50 parts of isocyanate Al-5040B, 20 parts of wood cellulose, 1.5 parts of white carbon black A200, and 1 part of foaming powder ST-15.

[0059] S4. Laminating a 1.20 mm double-sided fleece base fabric to form a base fabric layer, with a lamination thickness of 0.90 mm. After aging and drying at 140° C. for 4 min, peeling off the release paper and rolling to obtain a polyurethane synthetic leather product.

[0060] Example 3

[0061] This embodiment provides a soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings, which comprises a four-layer structure of a water-based surface layer, a soft polycarbonate polyether high-solid polyurethane middle layer, a solvent-free composite adhesive layer and a base fabric layer arranged in sequence from top to bottom, and the specific preparation method thereof is as follows:

[0062] S1. Forming a water-based surface layer: Apply the water-based surface layer slurry that has been fully stirred and evacuated to a vacuum to the surface of the release paper, with a coating knife gap of 10-15 threads, and heat and dry at 100°C to obtain a water-based surface layer.

[0063] Among them, the weight proportions of each component in the water-based surface slurry are as follows: 180 parts of water-based resin GW-1027M, 1 part of leveling agent LA-1610, 5 parts of curing cross-linking agent XR-5580, 6 parts of wear-resistant additive (NS-APU2277:3238=1:2), 0.5 parts of wetting agent LT-7110, 6 parts of pigment paste, and 30 parts of deionized water.

[0064] S2. Forming a soft polycarbon polyether high-solid polyurethane intermediate layer: applying the soft polycarbon polyether high-solid polyurethane intermediate layer slurry to the surface of the water-based surface layer, with a coating blade gap of 20-25 strands, and heating and drying at 100°C to obtain a soft polycarbon polyether high-solid polyurethane intermediate layer.

[0065] Among them, the weight proportions of each component in the soft polycarbon polyether high-solid polyurethane intermediate layer slurry are as follows: 120 parts of soft polycarbon polyether high-solid polyurethane AL-2015G, 0.4 parts of foaming agent EP-P42, 5 parts of curing crosslinking agent XR-5580, 1.5 parts of foaming powder ST-15, and 6 parts of pigment paste.

[0066] S3. Forming a solvent-free composite adhesive layer: applying the solvent-free composite adhesive layer slurry to the surface of the soft polycarbonate polyether high-solid polyurethane intermediate layer, with a coating head gap of 25-30 threads, preheating at 90°C until it is semi-dry, to obtain a solvent-free composite adhesive layer.

[0067] The weight percentages of the components in the solvent-free composite bonding layer slurry are as follows: 100 parts of polyol AL-2020A, 0.2 parts of metal catalyst Kosmos MB 8, 50 parts of isocyanate Al-5040B, 15 parts of wood cellulose, 1.5 parts of white carbon black A200, and 1 part of foaming powder ST-15.

[0068] S4. Laminating a 1.20 mm double-sided fleece base fabric to form a base fabric layer, with a lamination thickness of 0.90 mm. After aging and drying at 140° C. for 4 min, peeling off the release paper and rolling to obtain a polyurethane synthetic leather product.

[0069] Comparative Example 1

[0070] This comparative example adopts the same implementation method as Example 2, and the difference from Example 2 is that in this comparative example, no wear-resistant additive is added to the aqueous surface layer slurry.

[0071] Comparative Example 2

[0072] This comparative example adopts the same implementation method as Example 2, and the difference from Example 2 is that in this comparative example, white carbon black and foaming powder are not added to the solvent-free composite bonding layer slurry.

[0073] Comparative Example 3

[0074] This comparative example adopts the same implementation as Example 2, but differs from Example 2 in that: in this comparative example, no wood cellulose is added to the solvent-free composite adhesive layer slurry, but 20 parts of aluminum hydroxide are added.

[0075] The dosage of each slurry component in the above embodiments and comparative examples is shown in Table 1.

[0076] Table 1 Amount of slurry components in each layer in the examples and comparative examples (parts by weight)

[0077]

[0078] Test Case

[0079] The polyurethane synthetic leathers prepared in Examples 1-3 and Comparative Examples 1-3 were tested for wear resistance, crease resistance, hydrolysis resistance, and softness and hardness. The test results are shown in Table 2.

[0080] Table 2 Polyurethane synthetic leather performance test results

[0081]

[0082] It should be noted that in Table 2:

[0083] The anti-crease test method is: the mold is heated to 40℃, and 5kg air pressure is applied to the leather surface for 40s before being removed. The imprint left by the mold on the leather surface is observed. The lighter the imprint, the better the anti-crease effect.

[0084] The hydrolysis resistance test method is: QB / T4671-2014;

[0085] Wear resistance test method: QB / T2726-2005;

[0086] The hardness test method is: QB / T4195-2011;

[0087] It can be seen from the results in Table 4 that the polyurethane synthetic leather prepared in the comparative example has a stiff hand feel and a slightly poor anti-crease effect, or a soft hand feel but poor wear resistance; while the polyurethane synthetic leather prepared in the embodiment of the present invention has the characteristics of softness, good anti-crease performance and excellent durability by adjusting the formula of the components of the surface layer, the middle layer and the bonding layer, and is superior to the soft solvent-free products on the market.

[0088] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0089] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings, characterized in that: It comprises a water-based surface layer, a polyurethane middle layer, a solvent-free composite adhesive layer and a base fabric layer which are arranged in sequence from top to bottom. The solvent-free composite adhesive layer is prepared from a solvent-free composite adhesive layer slurry composed of the following components: polyol, metal catalyst, isocyanate, wood cellulose, white carbon black and foaming powder.

2. The soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings according to claim 1, characterized in that: The lignocellulose is silanized modified lignocellulose.

3. The soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings according to claim 1, characterized in that: The metal catalyst is an organic zinc-bismuth composite catalyst.

4. The soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings according to claim 1, characterized in that: The weight percentages of the components in the solvent-free composite adhesive layer slurry are as follows: 100-140 parts of polyol, 0.2-0.3 parts of metal catalyst, 50-70 parts of isocyanate, 10-20 parts of wood cellulose, 0.5-2 parts of white carbon black, and 0.5-1.5 parts of foaming powder.

5. The soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings according to claim 1, characterized in that: The aqueous surface layer is prepared from an aqueous surface layer slurry composed of the following components in parts by weight: 140-180 parts of aqueous polyether polyurethane dispersion, 0.5-1 part of leveling agent, 2-5 parts of curing crosslinking agent, 2-6 parts of wear-resistant additive, 0.2-0.5 part of wetting agent, 3-15 parts of pigment paste, and 20-50 parts of deionized water.

6. The soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and furniture according to claim 1, characterized in that: The polyurethane middle layer is prepared from a polyurethane middle layer slurry composed of the following components in parts by weight: 100 parts of soft polycarbonate polyether high-solid polyurethane, 0.2-0.5 parts of a foaming agent, 2-5 parts of a curing crosslinking agent, 0.5-1.5 parts of a foaming powder, and 3-8 parts of a pigment paste.

7. The soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings according to claim 1, characterized in that: The base fabric layer is made of recyclable polyester fiber, with a thickness of 1.2±0.05mm and a gram weight of 320±30g / cm 2 .

8. The soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings according to claim 5, characterized in that: The water-based polyether polyurethane dispersion is water-based resin GW-1027M.

9. A method for preparing the soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: Coating a water-based surface layer slurry on the release paper and drying it to obtain a water-based surface layer; Coating a polyurethane intermediate layer slurry on the aqueous surface layer, and drying to obtain a polyurethane intermediate layer; Coating a solvent-free composite adhesive layer slurry on the polyurethane intermediate layer and drying it to a semi-dry state to obtain a solvent-free composite adhesive layer; After the solvent-free composite adhesive layer is bonded to the base fabric layer, dried and the release paper is peeled off, a soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings is obtained.

10. The method for preparing the soft, crease-resistant, solvent-free polyurethane synthetic leather for sofas and home furnishings according to claim 9, characterized in that: When applying the water-based surface slurry, the coating blade gap is 10-15 wires; and / or, when coating the polyurethane intermediate layer slurry, the coating blade gap is 20-25 wires; And / or, when coating the solvent-free composite bonding layer slurry, the coating blade gap is 25-30 wires.

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