Water-based microfiber suede water-based polyurethane resin acting on automotive trim leather and preparation method of water-based microfiber suede water-based polyurethane resin

Abstract

The invention discloses water-based microfiber suede water-based polyurethane resin acting on automotive trim leather and a preparation method of the water-based microfiber suede water-based polyurethane resin, and relates to the technical field of polyurethane. Comprising the following raw material components in parts by weight: 100-200 parts of polyether polyol, 1-2 parts of an antioxidant, 1-2 parts of a light stabilizer, 40-70 parts of isocyanate, 0.5-3 parts of a chain extender, 3-5 parts of a neutralizer, 150-300 parts of deionized water, 4-7 parts of a hydrophilic chain extender, 5-50 parts of a post-chain extender, 2-10 parts of a coupling agent and 0-3 parts of a cross-linking agent. Wherein the polyol is polyether polyol; the waterborne polyurethane resin prepared by the invention does not contain any organic solvent, has excellent properties in alkali resistance, temperature resistance, stability, elongation at break and breaking strength, and endows a product with excellent fullness, so that the product is close to a leather product.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane, in particular to a water-based microfiber suede water-based polyurethane resin acting on automobile interior leather and a preparation method thereof. Background Art

[0002] At present, most of the microfiber suede used in the automotive field at home and abroad is a finished leather obtained by impregnation and reduction of solvent-based resin. Since solvent-based polyurethane contains a large amount of volatile organic solvents (VOC), it will pollute the environment on the one hand, and on the other hand, the presence of residual organic solvents will also endanger human health and cause waste of resources. At present, water-based microfiber suede leather is greener and more environmentally friendly than solvent-based microfiber suede leather, but water-based microfiber suede leather feels stiff and does not have the texture of genuine leather, and its physical properties, wear resistance, rubbing resistance and color fastness are not high. Summary of the invention

[0003] The present invention aims to solve the shortcomings of the background technology, and provides a water-based microfiber suede water-based polyurethane resin for automobile interior leather and a preparation method thereof, which at least solves some technical problems in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions: A water-based microfiber suede water-based polyurethane resin for automobile interior leather comprises the following raw material components and weight portions: 100-200 parts of polyol, 1-2 parts of antioxidant, 1-2 parts of light stabilizer, 40-70 parts of isocyanate, 0.5-3 parts of chain extender, 3-5 parts of neutralizer, 150-300 parts of deionized water, 4-7 parts of hydrophilic chain extender, 5-50 parts of post-chain extender, 2-10 parts of coupling agent and 0-3 parts of cross-linking agent.

[0005] Furthermore, the polyether polyol is a mixture of one or more of polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and tetramethylene glycol-propylene oxide copolymer; The number average molecular weight of the polyether polyol is 500-6000.

[0006] Furthermore, the polyether polyol, antioxidant, light stabilizer, chain extender, hydrophilic chain extender and cross-linking agent are all dried, and the moisture content is less than 0.05%.

[0007] Furthermore, the isocyanate is a mixture of any one or more of isophorone diisocyanate, dicyclohexane diisocyanate, and hexamethylene diisocyanate; The chain extender is a mixture of any one or more of trimethylolpropane, 1,4-butanediol, neopentyl glycol, 1,4-cyclohexanedimethanol, diethylene glycol, and glycerol; The hydrophilic chain extender is a mixture of any one or more of dimethylol propionic acid, dimethylol butyric acid, and aminosulfonate; The coupling agent is a mixture of one or more of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, a bimetallic coupling agent, a phosphate coupling agent, a borate coupling agent, and a chromium complex.

[0008] Furthermore, the neutralizing agent is a mixture of any one or more of triethylamine, dimethylethanolamine, triethanolamine and potassium hydroxide; The post-chain extender is a mixture of any one or more of ethylenediamine, isophoronediamine, diethylenetriamine, triethylenetetramine and hydrazine hydrate.

[0009] On the other hand, the present invention also provides a method for preparing a water-based microfiber suede water-based polyurethane resin for automobile interior leather, comprising the following steps: S1: drying the polyol, antioxidant and light stabilizer in vacuum at high temperature; S2: uniformly mixing the dried polyol, antioxidant, light stabilizer and isocyanate and heating them for reaction; S3: adding acetone, chain extender, and hydrophilic chain extender and mixing them evenly to carry out chain extension reaction to obtain a prepolymer; S4: adding a coupling agent and a neutralizing agent and stirring evenly to neutralize and emulsify the prepolymer to obtain a prepolymer emulsion; S5: adding a post-chain extender to carry out a chain growth reaction, and extracting acetone by vacuum to obtain a water-based microfiber suede water-based polyurethane resin.

[0010] Preferably, the S1 is specifically: Place polyol, antioxidant and light stabilizer in a four-necked flask equipped with a stirrer, thermometer, constant pressure funnel and vacuum pump, turn on the stirrer and vacuum pump, heat the materials in the reactor to 100-110°C through the automatic temperature control system, adjust the pressure to ≤-0.08MPa, and perform vacuum distillation for 1-2 hours to dehydrate the raw materials. Use a trace moisture meter to determine that the water content is less than 0.05%.

[0011] Preferably, S2 is specifically: The dried raw material in S1 is cooled to 60-70°C and then mixed evenly with isocyanate, and heated to 90-100°C for 2-3 hours; The S3 is specifically: Acetone, chain extender and hydrophilic chain extender are added and mixed evenly, and a chain extension reaction is carried out at 80° C. to 90° C. for 3 to 5 hours to obtain a prepolymer.

[0012] Preferably, S4 is specifically: Transfer the prepolymer to an emulsifying kettle, turn on the stirring device, add a coupling agent and a neutralizing agent and stir for 3 to 10 minutes for neutralization, then adjust the stirrer speed to 2000 to 3000 r / min, quickly add 150 to 300 g of deionized water, stir at high speed for 10 to 30 minutes to obtain a prepolymer emulsion; The S5 is specifically: Add the post-chain extender to the prepolymer emulsion, and react at a constant temperature of 60-70°C for 1-1.5 hours. Adjust the pressure to ≤-0.08MPa, vacuum extract acetone for 1-2 hours, cool to room temperature, and filter to obtain a water-based microfiber suede water-based polyurethane resin.

[0013] On the other hand, the present invention also provides an application of a water-based microfiber suede waterborne polyurethane resin acting on automobile interior leather, and a suede prepared using the water-based microfiber suede waterborne polyurethane resin as a raw material.

[0014] Beneficial effects of the present invention: The waterborne polyurethane resin prepared by adding polyether polyol with a number average molecular weight of 500-6000 not only does not contain any organic solvent, but also has excellent performance in alkali resistance, temperature resistance, stability, elongation at break and breaking strength, and at the same time gives the product excellent fullness, making the product close to leather products. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0016] The disclosure below provides many different embodiments or examples for implementing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0017] The present invention synthesizes a water-based polyurethane, improves the continuity of the resin in the microfiber and reduces the amount of resin used, so as to reduce the amount of water-based resin used in the impregnation process, thereby avoiding the shortcomings of poor continuity in the microfiber and high content of the finished leather, which are poor texture and stiffness compared to traditional water-based resins. The resin of the present invention improves the strength of the fiber, thereby improving the high wear resistance, abrasion resistance and high color fastness of the finished microfiber suede.

[0018] A water-based microfiber suede water-based polyurethane resin for automobile interior leather, comprising the following raw material components and weight parts: comprising the following raw material components and weight parts: 100-200 parts of polyol, 1-2 parts of antioxidant, 1-2 parts of light stabilizer, 40-70 parts of isocyanate, 0.5-3 parts of chain extender, 3-5 parts of neutralizer, 150-300 parts of deionized water, 4-7 parts of hydrophilic chain extender, 5-50 parts of post-chain extender, 2-10 parts of coupling agent, 0-3 parts of cross-linking agent; Among them, the polyol adopts polyether polyol.

[0019] In a further embodiment of this example, the polyether polyol is a mixture of one or more of polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and tetramethylene glycol-propylene oxide copolymer; The number average molecular weight of the polyether polyol is 500-6000.

[0020] In a further embodiment of this example, the polyether polyol, antioxidant, light stabilizer, chain extender, hydrophilic chain extender and cross-linking agent are all dried, and the moisture content is less than 0.05%.

[0021] In a further embodiment of this example, the isocyanate is a mixture of any one or more of isophorone diisocyanate, dicyclohexane diisocyanate, and hexamethylene diisocyanate; The chain extender is a mixture of any one or more of trimethylolpropane, 1,4-butanediol, neopentyl glycol, 1,4-cyclohexanedimethanol, diethylene glycol, and glycerol; The hydrophilic chain extender is a mixture of any one or more of dimethylol propionic acid, dimethylol butyric acid, and aminosulfonate; The coupling agent is a mixture of one or more of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, a bimetallic coupling agent, a phosphate coupling agent, a borate coupling agent, and a chromium complex.

[0022] In a further embodiment of this example, the neutralizing agent is a mixture of any one or more of triethylamine, dimethylethanolamine, triethanolamine and potassium hydroxide; The post-chain extender is a mixture of any one or more of ethylenediamine, isophoronediamine, diethylenetriamine, triethylenetetramine and hydrazine hydrate.

[0023] On the other hand, the present invention also provides a method for preparing a water-based microfiber suede water-based polyurethane resin for automobile interior leather, comprising the following steps: S1: drying the polyol, antioxidant and light stabilizer in vacuum at high temperature; S2: uniformly mixing the dried polyol, antioxidant, light stabilizer and isocyanate and heating them for reaction; S3: adding acetone, chain extender, and hydrophilic chain extender and mixing them evenly to carry out chain extension reaction to obtain a prepolymer; S4: adding a coupling agent and a neutralizing agent and stirring evenly to neutralize and emulsify the prepolymer to obtain a prepolymer emulsion; S5: adding a post-chain extender to carry out a chain growth reaction, and extracting acetone by vacuum to obtain a water-based microfiber suede water-based polyurethane resin.

[0024] In a further implementation of this embodiment, the S1 is specifically: Place polyol, antioxidant and light stabilizer in a four-necked flask equipped with a stirrer, thermometer, constant pressure funnel and vacuum pump, turn on the stirrer and vacuum pump, heat the materials in the reactor to 100-110°C through the automatic temperature control system, adjust the pressure to ≤-0.08MPa, and perform vacuum distillation for 1-2 hours to dehydrate the raw materials. Use a trace moisture meter to determine that the water content is less than 0.05%.

[0025] In a further implementation of this embodiment, S2 is specifically: The dried raw material in S1 is cooled to 60-70°C and then mixed evenly with isocyanate, and heated to 90-100°C for 2-3 hours; The S3 is specifically: Acetone, chain extender and hydrophilic chain extender are added and mixed evenly, and a chain extension reaction is carried out at 80° C. to 90° C. for 3 to 5 hours to obtain a prepolymer.

[0026] In a further implementation of this embodiment, the S4 is specifically: Transfer the prepolymer to an emulsifying kettle, turn on the stirring device, add a coupling agent and a neutralizing agent and stir for 3 to 10 minutes for neutralization, then adjust the stirrer speed to 2000 to 3000 r / min, quickly add 150 to 300 g of deionized water, stir at high speed for 10 to 30 minutes to obtain a prepolymer emulsion; The S5 is specifically: Add the post-chain extender to the prepolymer emulsion, and react at a constant temperature of 60-70°C for 1-1.5 hours. Adjust the pressure to ≤-0.08MPa, vacuum extract acetone for 1-2 hours, cool to room temperature, and filter to obtain a water-based microfiber suede water-based polyurethane resin.

[0027] On the other hand, the present invention also provides an application of a water-based microfiber suede waterborne polyurethane resin acting on automobile interior leather, and a suede prepared using the water-based microfiber suede waterborne polyurethane resin as a raw material.

[0028] It should be noted that: The present invention uses an acetone process to react polyether polyol with isocyanate and introduce a silane coupling agent, so that the obtained resin has a certain body structure and the molecular weight of the obtained polyurethane is improved to a certain extent, so that the water-based suede has excellent elongation at break and excellent tensile strength. The obtained suede has the leather feel of real leather through impregnation, and the touch feels like no cloth like general commercial products, so that the water-based microfiber suede with a full hand feel and excellent physical properties is obtained.

[0029] The chain extender and hydrophilic chain extender used can not only increase the length of the overall molecular chain, but also introduce hydrophilic groups to improve the emulsification and emulsion stability of the polyurethane prepolymer; Before adding coupling agent and neutralizing agent, calculate the NCO content of prepolymer to reach the theoretical value, then add coupling agent and neutralizing agent to form salt until the pH reaches 7~8; During the emulsification process, the solid content of the system is 25-35%; The amount of the antioxidant and light stabilizer used is 0.2% to 0.5% of the total mass of the polyol and the isocyanate.

[0030] The experimental methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials are obtained from conventional commercial channels or prepared by conventional methods unless otherwise specified.

[0031] The method for determining the content of NCO in the prepolymer is as follows: when the reaction proceeds to a certain extent, accurately weigh about 3g of the sample, and the weighing must be accurate to 0.001 g. Place the sample in a clean 250ml conical flask. Add 20mL of anhydrous toluene solution, shake the solution, take 10mL of di-n-butylamine toluene solution and shake it, place it at room temperature for about 20 minutes, add about 40mL of anhydrous ethanol, drop a few drops of bromocresol green as an indicator, titrate with 0.5mol / L hydrochloric acid, and do a blank test.

[0032] NCO%=(V0~V1)C*42 / 1000m×100% Where: V0-volume of hydrochloric acid standard solution consumed in blank test, mL; V1-volume of hydrochloric acid standard solution consumed by titrating the sample, mL; C-hydrochloric acid concentration, mol / L; m-test mass, g; 42-Molar mass of cyano group, g / mol.

[0033] Example 1 Step 1: Drying of polyether polyols First, add 16g of polyethylene glycol, 45.6g of polytetrahydrofuran ether glycol, 159.6g of polypropylene glycol, 1.37g of antioxidant 1010 and 1.37g of light stabilizer 866 to a 500ml four-necked flask with an electric stirrer, a thermometer, a constant pressure funnel and a vacuum pump. Then turn on the electric stirrer for stirring, turn on the oil bath for heating, turn on the positive vacuum pump to vacuum the four-necked flask. When the thermometer on the four-necked flask reaches 110°C and the vacuum pressure is ≤-0.08MPa, start timing, and maintain the temperature at 100°C~110°C and the pressure ≤-0.08MPa for vacuum dehydration for 1.5h.

[0034] Step 2: Preparation of waterborne polyurethane prepolymer When the water content in the polyol is less than 0.05%, turn off the vacuum pump and lower the temperature of the oil bath. When the thermometer temperature drops to 80°C, slowly add 19.75g of isophorone diisocyanate (IPDI) and 56g of dicyclohexane diisocyanate (HMDI) through a constant pressure funnel. After adding, stir evenly and start heating. When the temperature reaches 95°C, start timing and react at a constant temperature for 3 hours.

[0035] The -NCO content in the mixture was determined by titration to reach the designed value.

[0036] Then cool down to 70°C and add 2g of dried trimethylolpropane (TMP), 3.7g of dried 1,4-butanediol (BDO) and 5.6g of dried dimethylolpropionic acid (DMPA), stir evenly, add 60g of acetone and 0.5g of catalyst, gradually increase the temperature to 80°C, and carry out chain extension reaction at constant temperature for 3h until the -NCO content in the mixture reaches the designed value again, cool down and add 120g of acetone.

[0037] Step 3: Neutralization and emulsification of prepolymer The obtained prepolymer was immediately transferred to an emulsification kettle, 4.43 g of triethylamine (TEA) was added, and stirred for 5 minutes. After the prepolymer was completely neutralized, the stirring speed was increased to 2800 r / min, 572 g of deionized water was quickly added, and stirred at high speed for 10 minutes to obtain a prepolymer emulsion.

[0038] Step 4: Post-chain extension of waterborne polyurethane Add 20% 4.4 g isophorone diamine (EDA) aqueous solution to the prepolymer emulsion, stir for 10 min, and reduce the stirring speed to 800 r / min.

[0039] Then transfer it to a 1000ml three-necked flask with a thermometer and a stirring device, turn on the stirring device and the water bath, and raise the temperature while stirring. When the temperature reaches 60°C, maintain this temperature for a constant temperature reaction for 1.5 hours. Maintain a constant temperature water bath at 60°C to start desolventizing. When the solid content reaches the set 35%, cool the emulsion and filter it to obtain water-based polyurethane.

[0040] Example 2 Step 1: Drying of polyether polyols Add 84g of polypropylene glycol and 104g of polytetrahydrofuran ether diol, 2.66g of polyethylene glycol monomethyl ether, 1.43g of antioxidant 1010 and 1.46g of light stabilizer 866 into a 500ml four-necked flask equipped with an electric stirrer, a thermometer, a constant pressure funnel and a vacuum pump. Then turn on the electric stirrer for stirring, turn on the oil bath for heating, turn on the positive vacuum pump to evacuate the four-necked flask. Start timing when the thermometer on the four-necked flask reaches 110°C and the vacuum pressure is ≤-0.08MPa. Maintain the temperature at 100°C~120°C and the pressure ≤-0.08MPa for vacuum dehydration for 1h.

[0041] Step 2: Preparation of waterborne polyurethane prepolymer When the water content in the polyol is less than 0.05%, turn off the vacuum pump and lower the temperature of the oil bath. When the thermometer temperature drops to 85°C, slowly add 9.74g of isophorone diisocyanate (IPDI) and 45.8g of dicyclohexane diisocyanate (HMDI) through a constant pressure funnel. After adding, stir evenly and start heating. When the temperature reaches 90°C, start timing and react at a constant temperature for 2 hours.

[0042] The -NCO content in the mixture was determined by titration to reach the designed value.

[0043] Then cool down to 70℃, add 0.7g dried trimethylolpropane (TMP) and 6.5g dried dimethylolbutyric acid (DMBA), 1.3g dried neopentyl glycol (NPG) and stir evenly, add 60g acetone and 0.5g catalyst evenly, gradually heat up to 80℃, and carry out chain extension reaction at constant temperature for 3h until the -NCO content in the mixture reaches the designed value again, cool down and add 120g acetone gradually until the -NCO content in the mixture reaches the designed value again, and then the water-based polyurethane prepolymer can be obtained.

[0044] Step 3: Neutralization and emulsification of prepolymer The obtained prepolymer was immediately transferred to an emulsifying kettle to obtain 236.31 g of prepolymer, and then 1.5 g of silane coupling agent KH-602 and 3.54 g of dimethylethanolamine (DMEA) were added to the prepolymer and stirred for 3 minutes. After the prepolymer was completely neutralized, the stirring speed was increased to 2600 r / min, and 240.3 g of deionized water was quickly added and stirred at high speed for 10 minutes to obtain a prepolymer emulsion.

[0045] Step 4: Post-chain extension of waterborne polyurethane Add 13g of 20% isophoronediamine (IPDA) aqueous solution to the prepolymer emulsion and stir for 10 minutes, then slowly add 6g of ethylenediamine aqueous solution diluted with deionized water to a mass fraction of 10%, stir at high speed for 10 minutes after adding, and reduce the stirring speed to 800r / min.

[0046] Then transfer it to a 1000ml three-necked flask with a thermometer and a stirring device, turn on the stirring device and the oil bath, and raise the temperature while stirring. When the temperature reaches 60°C, maintain this temperature for a constant temperature reaction for 1.5 hours, and start desolventizing in a constant temperature water bath maintained at 60°C. When the solid content reaches the set 35%, cool the emulsion and filter it to obtain water-based polyurethane.

[0047] The comparative example uses a commercially available resin.

[0048] Example 1, Example 2 and the comparative example were respectively compounded according to the contents in Table 1, and then the finished suede was obtained through processes such as padding, impregnation, reduction and sanding.

[0049] Table 1 Impregnation resin formula

[0050] The obtained suede was tested, and the test results are shown in Table 2.

[0051] Table 2 Basic performance comparison

[0052] Note: 1. The test condition for alkali resistance is boiling in 1% NaOH solution at 100℃ for 30 minutes.

[0053] 2. The test condition for temperature resistance is 120℃ hanging for 168 hours.

[0054] 3. Stability The storage stability of the waterborne polyurethane emulsion is simulated by a centrifugation experiment: an appropriate amount of the prepared waterborne polyurethane emulsion is placed in a centrifuge tube, the speed is set to 3000 r / min, and after centrifugation for 15 minutes, if the emulsion can still exist stably, it can be concluded that the emulsion can exist stably for at least 6 months.

[0055] In summary, the solvent-free waterborne polyurethane synthesized by Example 1 and Example 2 is superior to commercially available resins in terms of temperature resistance, stability, elongation at break and breaking strength, and is a high-solid solvent-free waterborne polyurethane with excellent performance. The textile fabric after application comparison has a full feel and is not stiff.

[0056] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of the above disclosed technical contents without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A water-based microfiber suede water-based polyurethane resin for automobile interior leather, characterized in that: The invention comprises the following raw material components and parts by weight: 100-200 parts of polyether polyol, 1-2 parts of antioxidant, 1-2 parts of light stabilizer, 40-70 parts of isocyanate, 0.5-3 parts of chain extender, 3-5 parts of neutralizer, 150-300 parts of deionized water, 4-7 parts of hydrophilic chain extender, 5-50 parts of post-chain extender, 2-10 parts of coupling agent and 0-3 parts of cross-linking agent.

2. The water-based microfiber suede water-based polyurethane resin for automobile interior leather according to claim 1, characterized in that: The polyether polyol is a mixture of one or more of polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and tetramethylene glycol-propylene oxide copolymer; The number average molecular weight of the polyether polyol is 500-6000.

3. The water-based microfiber suede water-based polyurethane resin for automobile interior leather according to claim 1, characterized in that: The polyether polyol, antioxidant, light stabilizer, chain extender, hydrophilic chain extender and cross-linking agent are all dried, and the moisture content is lower than 0.05%.

4. The water-based microfiber suede water-based polyurethane resin for automobile interior leather according to claim 1, characterized in that: The isocyanate is any one or more of isophorone diisocyanate, dicyclohexane diisocyanate and hexamethylene diisocyanate; The chain extender is a mixture of any one or more of trimethylolpropane, 1,4-butanediol, neopentyl glycol, 1,4-cyclohexanedimethanol, diethylene glycol, and glycerol; The hydrophilic chain extender is a mixture of any one or more of dimethylol propionic acid, dimethylol butyric acid, and aminosulfonate; The coupling agent is a mixture of one or more of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, a bimetallic coupling agent, a phosphate coupling agent, a borate coupling agent, and a chromium complex.

5. The water-based microfiber suede water-based polyurethane resin for automobile interior leather according to claim 1, characterized in that: The neutralizing agent is a mixture of any one or more of triethylamine, dimethylethanolamine, triethanolamine and potassium hydroxide; The post-chain extender is a mixture of any one or more of ethylenediamine, isophoronediamine, diethylenetriamine, triethylenetetramine and hydrazine hydrate.

6. A method for preparing a water-based microfiber suede water-based polyurethane resin for automobile interior leather, characterized in that: The following steps are involved: S1: drying the polyether polyol, antioxidant and light stabilizer in vacuum at high temperature; S2: uniformly mixing the dried polyol, antioxidant, light stabilizer and isocyanate and heating them for reaction; S3: adding acetone, chain extender, and hydrophilic chain extender and mixing them evenly to carry out chain extension reaction to obtain a prepolymer; S4: adding a coupling agent and a neutralizing agent and stirring evenly to neutralize and emulsify the prepolymer to obtain a prepolymer emulsion; S5: adding a post-chain extender to carry out a chain growth reaction, and extracting acetone by vacuum to obtain a water-based microfiber suede water-based polyurethane resin.

7. The method for preparing the water-based microfiber suede water-based polyurethane resin for automobile interior leather according to claim 6, characterized in that: The S1 is specifically: Place polyol, antioxidant and light stabilizer in a four-necked flask equipped with a stirrer, thermometer, constant pressure funnel and vacuum pump, turn on the stirrer and vacuum pump, heat the materials in the reactor to 100-110°C through the automatic temperature control system, adjust the pressure to ≤-0.08MPa, and perform vacuum distillation for 1-2 hours to dehydrate the raw materials. Use a trace moisture meter to determine that the water content is less than 0.05%.

8. The method for preparing the water-based microfiber suede water-based polyurethane resin for automobile interior leather according to claim 6, characterized in that: The S2 is specifically: The dried raw material in S1 is cooled to 60-70°C and then mixed evenly with isocyanate, and heated to 90-100°C for 2-3 hours; The S3 is specifically: Acetone, chain extender and hydrophilic chain extender are added and mixed evenly, and a chain extension reaction is carried out at 80° C. to 90° C. for 3 to 5 hours to obtain a prepolymer.

9. The method for preparing the water-based microfiber suede water-based polyurethane resin for automobile interior leather according to claim 6, characterized in that: The S4 is specifically: Transfer the prepolymer to an emulsifying kettle, turn on the stirring device, add a coupling agent and a neutralizing agent and stir for 3 to 10 minutes for neutralization, then adjust the stirrer speed to 2000 to 3000 r / min, quickly add 150 to 300 g of deionized water, stir at high speed for 10 to 30 minutes to obtain a prepolymer emulsion; The S5 is specifically: Add the post-chain extender to the prepolymer emulsion, and react at a constant temperature of 60-70°C for 1-1.5 hours. Adjust the pressure to ≤-0.08MPa, vacuum extract acetone for 1-2 hours, cool to room temperature, and filter to obtain a water-based microfiber suede water-based polyurethane resin.

10. An application of a water-based microfiber suede water-based polyurethane resin for automobile interior leather, characterized in that: The suede is prepared with water-based microfiber suede water-based polyurethane resin as raw materials.

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