A washable leather-imitation paper and a method for preparing the same

Abstract

This invention discloses a washable paper that mimics leather, comprising a base paper layer, an impregnation and reinforcement layer, and a leather-like silicone coating. The impregnation and reinforcement layer is obtained by impregnating the base paper layer in an aqueous formaldehyde-free resin, and the leather-like silicone coating is roller-coated onto the impregnated base paper layer. A method for preparing the leather-like washable paper includes the following steps: S1, pretreating the base paper; S2, immersing the base paper in an aqueous formaldehyde-free resin solution; S3, removing the base paper from the aqueous formaldehyde-free resin solution and subjecting it to gradient drying until it reaches a semi-dry state; S4, roller-coating the semi-dry impregnated paper with liquid silicone, adding microporous materials during the roller coating process to form microporous channels on the base paper; S5, curing the roller-coated base paper. This achieves high abrasion resistance and a genuine leather-like feel in the leather-like washable paper; using materials such as aqueous formaldehyde-free resin achieves zero VOC emissions; and by adding microporous materials, the moisture permeability and breathability of the coating are improved, making it a viable alternative to traditional synthetic leather.

Description

Technical Field

[0001] This invention belongs to the field of environmentally friendly materials technology, and in particular relates to a washable paper that mimics leather. Background Technology

[0002] Traditional synthetic leathers, such as PU and PVC, rely on toxic solvents such as dimethylformamide (DMF) and toluene during production. This not only results in volatile organic compound (VOC) emissions of up to 500-1000 mg / m³, but also generates a large amount of toxic wastewater with a COD value >5000 mg / L. Genuine leather production requires a large amount of animal resources, and the tanning process uses heavy metals such as chromium salts, resulting in high wastewater treatment costs, with each ton of wastewater costing >50 yuan.

[0003] In recent years, silicone synthetic leather has attracted attention due to its environmental friendliness, but existing technologies have obvious shortcomings: 1. Insufficient breathability: For example, in the artificial silicone leather production process disclosed in CN117403449A, nano alumina is added to improve breathability, but the bonding force between the coating and the substrate is weak, the peel strength is <20N / cm, and it is easy to delaminate. 2. Poor adhesion: For example, CN116180462B discloses a simulated leather liquid silicone for coating fiber fabric and its preparation method. In this method, fluorinated vinyl silicone oil is used to improve adhesion, but it requires high temperature curing above 180°C, which consumes a lot of energy. III. Environmental limitations: For example, in the preparation method of an environmentally friendly silicone synthetic leather disclosed in publication number CN104652137A, although organosilicon is used to replace solvent-based resin, the impregnating resin still contains formaldehyde, with an release amount >50ppm, which does not meet the environmental protection requirements of GB 18580-2017. Summary of the Invention

[0004] The purpose of this invention is to provide a washable imitation leather paper and its preparation method that can solve at least one of the above problems.

[0005] According to one aspect of the present invention, a washable paper with imitation leather is provided, comprising a base paper layer, an impregnation reinforcement layer and an imitation leather silicone coating, wherein the impregnation reinforcement layer is obtained by impregnating the base paper layer in an aqueous formaldehyde-free resin, and the imitation leather silicone coating is rolled onto the impregnated base paper layer.

[0006] In some embodiments, the base paper layer is made of natural fiber pulp with a basis weight of 80~120 g / m²; When the base paper layer is impregnated with water-based formaldehyde-free resin to obtain the impregnation reinforcement layer, the impregnation amount of the base paper layer is 30~50 g / m², and the dry thickness of the base paper layer after impregnation is 0.05~0.1 mm. The imitation leather silicone coating is formed by rolling liquid silicone onto the impregnated base paper layer, and the overall thickness after rolling is 0.1~0.5mm.

[0007] In some embodiments, the liquid silicone of the imitation leather silicone coating further includes microporous materials and adhesion promoters. The microporous materials are nano-alumina and / or modified silica, and the adhesion promoters are vinyltrimethoxysilane. The molecular weight of the liquid silicone is 50,000 to 100,000 g / mol.

[0008] In some embodiments, the amount of microporous material added to the imitation leather silicone coating is 5% to 15% of the weight of liquid silicone, the particle size of nano-alumina is 50 to 200 nm, the specific surface area of ​​modified silica is 100 to 300 m² / g, the micropore diameter of the microporous material is 5 to 50 μm, and it has a three-dimensional interconnected structure. The silicone coating has a moisture permeability ≥ 2000 g / m²・24h and an air permeability ≥ 800 mm / s.

[0009] In some embodiments, the waterborne formaldehyde-free resin is a waterborne acrylic resin and / or a waterborne polyurethane resin, wherein the solid content of the waterborne formaldehyde-free resin is 30% to 50% and the viscosity is 500 to 2000 mPa·s.

[0010] According to another aspect of the present invention, a method for preparing a washable paper resembling leather is provided, comprising the following steps: S1. Pre-treat the base paper; S2. Immerse the base paper in an aqueous formaldehyde-free resin solution; S3. After removing the base paper from the aqueous formaldehyde-free resin solution, perform gradient drying to make the base paper reach a semi-dry state. S4. Apply liquid silicone to the semi-dry impregnated paper during the roller coating process, adding microporous material to form microporous channels on the base paper. S5. Curing the base paper after roller coating.

[0011] In some embodiments, the pretreatment of the base paper in step S1 is to perform plasma treatment on the base paper, wherein the hydroxyl content on the surface of the base paper is ≥0.5mmol / g, and the base paper is subjected to constant temperature and humidity treatment in step S1, and the moisture content of the base paper is 6%~8%.

[0012] In some embodiments, the mass ratio of base paper to resin liquid in step S2 is 1:2 to 1:5. Through double-roll pressing, the water-based formaldehyde-free resin penetrates to 60% to 80% of the thickness of the base paper, and the impregnation amount is 30 to 50 g / m².

[0013] In some embodiments, in step S4, the liquid silica gel and diluent are mixed at a ratio of 1:1 to 1:3, and after adding 1 to 3% silane coupling agent, it is coated on the surface of semi-dry impregnated paper with a wet film thickness of 0.2 to 0.8 mm. The viscosity of the liquid silica gel is 100,000 to 300,000 mPa·s, the adhesion promoter is vinyltrimethoxysilane, the amount added is 1 to 3% of the weight of the liquid silica gel, and the residual monomer content is ≤0.1% as determined by gas chromatography.

[0014] In some embodiments, during gradient drying in step S3, the temperature is increased in stages, from 80°C to 120°C to 150°C.

[0015] The beneficial effects of this invention are as follows: 1. By using an impregnation reinforcement layer and a leather-like silicone coating, the abrasion resistance and washability of the leather-like washable paper are greatly improved, and the effect of achieving the feel of genuine leather is achieved. 2. The basis weight of the base paper layer is 80~120g / m², which makes the base paper easy to impregnate and facilitates the penetration of water-based formaldehyde-free resin into the base paper. 3. Add appropriate microporous materials and adhesion promoters to the coating material, and add vinyltrimethoxysilane-modified silica to the liquid silicone to enhance the interfacial compatibility between the particles and the silicone matrix and improve the tensile strength of the coating to ≥8MPa. 4. Throughout the entire preparation process of the imitation leather washable paper, the use of water-based formaldehyde-free resin and organosilicon materials achieves zero VOC emissions (i.e., VOC content ≤10mg / L). By adding microporous materials such as nano-alumina and modified silica, the coating achieves a moisture permeability ≥2000g / m²・24h and an air permeability ≥800mm / s. The product can replace traditional synthetic leather and is suitable for furniture, packaging, decoration and other fields. 5. The impregnated base paper is dried in a gradient to avoid wrinkles caused by thermal stress, achieving a flatness error of ≤0.5mm / m; at the same time, it achieves energy-saving effect. 6. In the preparation method of the present invention, an impregnation-roll coating composite process is adopted. First, the mechanical properties of the base paper are enhanced by impregnation, so that the tensile strength of the base paper is increased by 50%. Then, silicone is rolled to form a functional skin layer, which solves the problem of easy cracking of traditional single coating. 7. By adjusting the amount of vinyltrimethoxysilane added to liquid silicone as an adhesion promoter, the coating hardness can be precisely controlled to simulate the resilience of genuine leather, resulting in an elastic recovery rate of ≥90% for the imitation leather washable paper. 8. The imitation leather washable paper obtained by the present invention has the advantages of low VOC, high adhesion, high breathability and washability. Detailed Implementation

[0017] The present invention will now be described in further detail.

[0018] This invention discloses a washable paper with a leather-like finish, comprising a base paper layer, an impregnation and reinforcement layer, and a leather-like silicone coating. The impregnation and reinforcement layer is obtained by impregnating the base paper layer in an aqueous formaldehyde-free resin, and the leather-like silicone coating is rolled onto the impregnated base paper layer. This washable paper with a leather-like finish can replace traditional synthetic leather and is suitable for furniture, packaging, and decoration.

[0019] The base paper layer is made of natural fiber pulp with a basis weight of 80~120g / m². When the base paper layer is impregnated with water-based formaldehyde-free resin to obtain the impregnation reinforcement layer, the impregnation amount of the base paper layer is 30~50 g / m², and the dry thickness of the base paper layer after impregnation is 0.05~0.1 mm. The imitation leather silicone coating is formed by rolling liquid silicone onto the impregnated base paper layer, and the overall thickness after rolling is 0.1~0.5mm; the liquid silicone is polydimethylsiloxane (PDMS).

[0020] The liquid silicone in the imitation leather silicone coating also includes microporous materials and adhesion promoters. The microporous materials are nano-alumina and / or modified silica, and the adhesion promoter is vinyltrimethoxysilane. The molecular weight of the liquid silicone is 50,000~100,000 g / mol. In practical applications, the microporous materials are a combination of nano-alumina and modified silica. By adding vinyltrimethoxysilane as the adhesion promoter and modified silica, the interfacial compatibility between the particles and the silicone matrix is ​​increased, improving the coating's tensile strength to ≥8 MPa.

[0021] By adding a vinyltrimethoxysilane adhesion promoter to liquid silicone, and the amount of the adhesion promoter added is 5% to 10% of the weight of liquid silicone, the hardness of the coating can be controlled, with a hardness of Shore A 60 to 80, which can simulate the elasticity of genuine leather, achieve the feel of genuine leather, and have an elastic recovery rate of ≥90%.

[0022] The amount of microporous material added to the imitation leather silicone coating is 5% to 15% of the weight of liquid silicone. The particle size of nano-alumina is 50 to 200 nm, and the specific surface area of ​​modified silica is 100 to 300 m² / g, preferably 100 m² / g, 200 m² / g, and 300 m² / g. The micropore diameter of the microporous material is 5 to 50 μm, and it has a three-dimensional interconnected structure. The silicone coating has a moisture permeability ≥2000 g / m²・24h and an air permeability ≥800 mm / s. Therefore, after being rolled onto the base paper, the imitation leather washable paper has excellent air permeability.

[0023] The waterborne formaldehyde-free resin is a waterborne acrylic resin and / or a waterborne polyurethane resin. The solid content of the waterborne formaldehyde-free resin is 30%~50%, the viscosity is 500~2000mPa・s at 25℃, the volatile organic compound (VOC) content is ≤10mg / L, the formaldehyde content is ≤16ppm, and it has been tested according to GB 18583-2008 and has no formaldehyde release.

[0024] The preparation method of the above-mentioned imitation leather washable paper includes the following steps: S1. Pretreatment of base paper: Plasma treatment is performed on the base paper using a plasma treatment machine with a power of 300~500W and a treatment time of 3~8min. The base paper is in a nitrogen atmosphere. After plasma treatment, the hydroxyl content on the surface of the base paper is ≥0.5mmol / g. In step S1, the base paper is subjected to constant temperature and humidity treatment. The base paper is treated in an environment with a temperature of 23±2℃ and a humidity of 50±5% for 24 hours, so that the moisture content of the base paper is 6%~8%.

[0025] S2. Immerse the base paper in an aqueous formaldehyde-free resin solution.

[0026] S3. After removing the base paper from the water-based formaldehyde-free resin solution, it undergoes gradient drying until it reaches a semi-dry state. In this step, an infrared dryer is used for segmented gradient heating: 80℃ / 5~10min-120℃ / 5~10min-150℃ / 3~5min, controlling the volatile content of the base paper to reduce to 5%~7% after drying, avoiding a heat shrinkage rate >1%, and ensuring the flatness of the base paper. By adopting a three-stage heating method, the rate of moisture evaporation is controlled, preventing wrinkles in the base paper due to thermal stress, ensuring that the flatness error of the base paper is ≤0.5mm / m; at the same time, the overall energy consumption required for drying is reduced, achieving energy-saving effects.

[0027] S4. Apply liquid silicone to the semi-dry impregnated paper using a roller coating process. Add microporous material during the roller coating to form microporous channels on the base paper. Use a comma-shaped doctor blade for the roller coating process and control the wet film thickness to 0.2~0.8mm. In this step, nano-alumina and / or modified silica are added simultaneously during the roller coating process to form microporous channels using the particle stacking effect. The microporous material is dispersed using a high-speed disperser at 1500-2000 r / min for 10-15 min. By adding microporous material to liquid silica gel and utilizing the particle stacking effect to form microporous channels, a three-dimensional interconnected microporous structure with a pore size of 5-50 μm is created, allowing water molecules to pass through rapidly. Simultaneously, the water resistance of the silica gel molecular chains ensures stable performance after washing.

[0028] S5. Curing the coated base paper: Heat-cur the coated base paper in a hot air circulating oven at 140~160℃ for 5~20 minutes; then, cool it to room temperature of about 25℃ and then roll it up, controlling the winding tension at 50~100N.

[0029] In actual production, in order to improve the bonding strength between the resin and the base paper in step S2, the base paper can be pretreated in a deep eutectic solvent. The deep eutectic solvent is a solvent with a weight ratio of choline chloride: menthol = 1:2. By pretreating the base paper in the deep eutectic solvent, the fiber looseness in the base paper can be improved, the porosity can be increased by 20%, and the bonding strength between the base paper and the resin can be improved.

[0030] In step S2, the mass ratio of base paper to resin liquid is 1:2 to 1:5. The paper is pressed by two rollers at a pressure of 0.3 to 0.5 MPa, so that the water-based formaldehyde-free resin penetrates to 60% to 80% of the thickness of the base paper and the impregnation amount is 30 to 50 g / m².

[0031] In step S4, liquid silica gel and diluent are mixed at a ratio of 1:1 to 1:3, and 1 to 3% silane coupling agent is added before coating onto the surface of semi-dry impregnated paper. The diluent is toluene or ethanol with a purity ≥99%, and the silane coupling agent is γ-aminopropyltriethoxysilane with a purity ≥98%. The viscosity of the liquid silica gel is 100,000 to 300,000 mPa·s, and the adhesion promoter is vinyltrimethoxysilane, added at 1 to 3% of the weight of the liquid silica gel. The residual monomer content is ≤0.1% as determined by gas chromatography.

[0032] During gradient drying in step S3, the temperature is increased in stages, from 80℃ to 120℃ to 150℃.

[0033] For specific examples, please refer to the following embodiments: Example 1

[0034] A method for preparing a washable paper that mimics leather, comprising the following steps: S1. Pre-treatment of the base paper: The cotton pulp base paper with a basis weight of 100g / m² and a thickness of 0.1mm is subjected to constant temperature and humidity treatment, with a temperature of 23℃, a humidity of 50%, and a treatment time of 24h. Then, it is subjected to plasma treatment with a power of 400W and a nitrogen atmosphere treatment for 5min, so that the surface hydroxyl content reaches 0.6mmol / g. S2. Immerse the base paper in an aqueous formaldehyde-free resin solution; immerse the base paper in an aqueous acrylic resin solution, wherein the aqueous formaldehyde-free resin has a solid content of 40%, a viscosity of 1000 mPa·s, a base paper to resin solution mass ratio of 1:3, a double-roller pressing pressure of 0.4 MPa, and controls the impregnation amount to 40 g / m². S3. After removing the base paper from the aqueous formaldehyde-free resin solution, perform gradient drying until the base paper reaches a semi-dry state; wherein, the gradient drying temperature is: 80℃ / 8min-120℃ / 8min-150℃ / 4min, the volatile content is reduced to 6.5%, and the heat shrinkage rate is 0.8%; S4. Apply liquid silicone to the semi-dry impregnated paper. Add microporous material during the coating process to form microporous channels on the base paper. The liquid silicone has a viscosity of 200,000 mPa·s. Mix it with ethanol at a ratio of 1:2 and add 2% γ-aminopropyltriethoxysilane. Use a comma-shaped doctor blade to coat the wet film to a thickness of 0.4 mm. During roller coating, 10% nano-alumina with a particle size of 100 nm is added and dispersed at 2000 r / min for 12 min to form a three-dimensional microporous structure. S5. Curing the coated base paper at 150℃ for 20 minutes; then cooling to 25℃ and winding. Example 2

[0035] This embodiment is basically the same as Embodiment 1, except that: A method for preparing a washable paper that mimics leather, comprising the following steps: S1. Pre-treatment of the base paper: The cotton pulp base paper with a basis weight of 80g / m² and a thickness of 0.05mm is subjected to constant temperature and humidity treatment, with a temperature of 21℃, a humidity of 50%, and a treatment time of 24h. Then, it is subjected to plasma treatment with a power of 300W and a nitrogen atmosphere treatment for 5min, so that the surface hydroxyl content reaches 0.65mmol / g. S2. Immerse the base paper in an aqueous formaldehyde-free resin solution; immerse the base paper in an aqueous acrylic resin solution, wherein the solid content of the aqueous formaldehyde-free resin is 30%, the viscosity is 500 mPa·s, the mass ratio of base paper to resin solution is 1:5, the double roller pressing pressure is 0.5 MPa, and the impregnation amount is controlled at 30 g / m². S3. After removing the base paper from the aqueous formaldehyde-free resin solution, perform gradient drying until the base paper reaches a semi-dry state; wherein, the gradient drying temperature is: 80℃ / 8min-120℃ / 8min-150℃ / 4min, the volatile content is reduced to 5%, and the heat shrinkage rate is 0.7%; S4. Apply liquid silicone to the semi-dry impregnated paper. Add microporous material during the coating process to form microporous channels on the base paper. The liquid silicone has a viscosity of 100,000 mPa·s. Mix it with ethanol at a ratio of 1:3 and add 1% γ-aminopropyltriethoxysilane. Use a comma-shaped doctor blade to coat the wet film to a thickness of 0.2 mm. During roller coating, 4% nano-alumina and 1% modified silica are added. The nano-alumina particles have a diameter of 50 nm and are dispersed at 1500 r / min for 15 min to form a three-dimensional microporous structure. S5. Curing the coated base paper at 140℃ for 5 minutes; then cooling to 25℃ and winding it up. Example 3

[0036] This embodiment is basically the same as Embodiment 1, except that: A method for preparing a washable paper that mimics leather, comprising the following steps: S1. Pre-treatment of the base paper: The cotton pulp base paper with a basis weight of 120g / m² and a thickness of 0.1mm is subjected to constant temperature and humidity treatment, with a temperature of 25℃, a humidity of 50%, and a treatment time of 24h. Then, it is subjected to plasma treatment with a power of 500W and a nitrogen atmosphere treatment for 5min, so that the surface hydroxyl content reaches 0.7mmol / g. S2. Immerse the base paper in an aqueous formaldehyde-free resin solution; immerse the base paper in an aqueous acrylic resin solution, wherein the aqueous formaldehyde-free resin has a solid content of 50%, a viscosity of 2000 mPa·s, a base paper to resin solution mass ratio of 1:2, a double-roller pressing pressure of 0.3 MPa, and controls the impregnation amount to 50 g / m². S3. After removing the base paper from the aqueous formaldehyde-free resin solution, perform gradient drying until the base paper reaches a semi-dry state; wherein, the gradient drying temperature is: 80℃ / 8min-120℃ / 8min-150℃ / 4min, the volatile content is reduced to 7%, and the heat shrinkage rate is 0.9%; S4. Apply liquid silicone to the semi-dry impregnated paper. Add microporous material during the coating process to form microporous channels on the base paper. The liquid silicone has a viscosity of 300,000 mPa·s. Mix it with ethanol at a ratio of 1:1 and add 3% γ-aminopropyltriethoxysilane. Use a comma-shaped doctor blade to coat the wet film to a thickness of 0.8 mm. During roller coating, 10% nano-alumina and 5% modified silica are added. The nano-alumina particles have a diameter of 50 nm and are dispersed at 2000 r / min for 10 min to form a three-dimensional microporous structure. S5. Curing the coated base paper at 150℃ for 10 minutes; then cooling to 25℃ and winding.

[0037] The washable imitation leather paper prepared by the methods in the above embodiments was subjected to performance testing. The specific test results are shown in the table below: Moisture permeability 2350g / m²·24h ≥1500g / m²·24h Peel strength 35N / cm ≥25N / cm VOC emissions Not detected ≤50mg / m³ Appearance after 50 washes No cracks or delamination No obvious damage Abrasion resistance (Taber) 3.2mg / 1000 doses ≤10mg / 1000 times In summary, the imitation leather washable paper of the present invention has excellent environmental protection effects. The entire production process uses a water-based system and formaldehyde-free materials, VOC emissions were not detected, and the formaldehyde content was ≤5ppm, which complies with the EU REACH and the domestic GB18583-2008 standards. The entire preparation process adopts an immersion-roll coating process, with an actual production speed of 3~10m / s, which improves the coating efficiency of traditional synthetic leather by 50%, and the daily production capacity of a single production line is ≥5000m². The product has excellent stain resistance and moisture permeability; At the same time, it has excellent durability. After 50 washes (40℃, neutral detergent), the peel strength retention rate is 92% and the moisture permeability decreases by ≤5%, meeting the requirements for long-term use. Compared with traditional PU synthetic leather, the amount of base paper and silicone used is reduced by 40%, and the unit area cost is 20% to 30% lower, which has the potential for large-scale application.

[0038] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A type of washable paper that mimics leather, characterized in that, It includes a base paper layer, an impregnation reinforcement layer, and a leather-like silicone coating. The impregnation reinforcement layer is obtained by impregnating the base paper layer in an aqueous formaldehyde-free resin, and the leather-like silicone coating is rolled onto the impregnated base paper layer.

2. The imitation leather washable paper according to claim 1, characterized in that, The base paper layer is made of natural fiber pulp with a basis weight of 80~120g / m². When the base paper layer is impregnated with water-based formaldehyde-free resin to obtain the impregnation reinforcement layer, the impregnation amount of the base paper layer is 30~50 g / m², and the dry thickness of the base paper layer after impregnation is 0.05~0.1 mm. The imitation leather silicone coating is formed by rolling liquid silicone onto an impregnated base paper layer, and the overall thickness after rolling is 0.1~0.5mm.

3. The imitation leather washable paper according to claim 2, characterized in that, The liquid silicone of the imitation leather silicone coating also includes microporous materials and adhesion promoters. The microporous materials are nano-alumina and / or modified silica, and the adhesion promoters are vinyltrimethoxysilane. The molecular weight of the liquid silicone is 50,000 to 100,000 g / mol.

4. The imitation leather washable paper according to claim 3, characterized in that, The amount of microporous material added to the imitation leather silicone coating is 5%~15% of the weight of liquid silicone, the particle size of nano alumina is 50~200nm, the specific surface area of ​​modified silica is 100~300m² / g, the micropore diameter of the microporous material is 5~50μm, and it has a three-dimensional interconnected structure. The silicone coating has a moisture permeability ≥2000g / m²・24h and an air permeability ≥800mm / s.

5. The imitation leather washable paper according to claim 4, characterized in that, The waterborne formaldehyde-free resin is a waterborne acrylic resin and / or a waterborne polyurethane resin, wherein the solid content of the waterborne formaldehyde-free resin is 30%~50% and the viscosity is 500~2000 mPa·s.

6. The method for preparing a washable, leather-like paper as described in claim 5, characterized in that, Includes the following steps: S1. Pre-treat the base paper; S2. Immerse the base paper in an aqueous formaldehyde-free resin solution; S3. After removing the base paper from the aqueous formaldehyde-free resin solution, perform gradient drying to make the base paper reach a semi-dry state. S4. Apply liquid silicone to the semi-dry impregnated paper during the roller coating process, adding microporous material to form microporous channels on the base paper. S5. Curing the base paper after roller coating.

7. The method for preparing a washable imitation leather paper according to claim 6, characterized in that, In step S1, the base paper pretreatment involves plasma treatment of the base paper, wherein the hydroxyl content on the surface of the base paper is ≥0.5mmol / g, and the base paper is subjected to constant temperature and humidity treatment in step S1, with a moisture content of 6%~8%.

8. The method for preparing a washable paper resembling leather according to claim 7, characterized in that, In step S2, the mass ratio of base paper to resin liquid is 1:2 to 1:

5. Through double-roll pressing, the water-based formaldehyde-free resin penetrates to 60% to 80% of the thickness of the base paper, and the impregnation amount is 30 to 50 g / m².

9. The method for preparing a washable imitation leather paper according to claim 8, characterized in that, In step S4, liquid silica gel and diluent are mixed at a ratio of 1:1 to 1:3, and 1 to 3% silane coupling agent is added. The mixture is then applied to the surface of semi-dry impregnated paper, with a wet film thickness of 0.2 to 0.8 mm. The viscosity of the liquid silica gel is 100,000 to 300,000 mPa·s, and the adhesion promoter is vinyltrimethoxysilane, added at 1 to 3% of the weight of the liquid silica gel. The residual monomer content is ≤0.1% as determined by gas chromatography.

10. The method for preparing a washable paper resembling leather according to claim 9, characterized in that, During gradient drying in step S3, the temperature is increased in stages, from 80℃ to 120℃ to 150℃.