Two-component water-based adhesive for automotive trim and preparation method of two-component water-based adhesive

Abstract

The invention discloses a bi-component water-based adhesive for automotive trim and a preparation method of the bi-component water-based adhesive, and relates to the technical field of adhesive preparation. Oligomer polyol, polyisocyanate, a catalyst, a solvent, a nonionic hydrophilic monomer, a micromolecule chain extender and a sulfonic acid hydrophilic monomer are subjected to a co-reaction for 2-7 h; the preparation method comprises the following steps: preparing a component A, adding a silane coupling agent, waterborne polyurethane and an acrylate polymer, stirring, adding N, fluorodichloromethyl sulfo and N, N-dimethyl-N '-phenyl sulfonamide, mixing and stirring to obtain a modified component B, and mixing and stirring the component A and the modified component B to obtain the bi-component water-based adhesive. According to the bi-component water-based adhesive for the automotive trim and the preparation method of the bi-component water-based adhesive, the water dispersibility and the antioxidant stability of the water-based adhesive are improved, the situation that the water-based adhesive is affected by the environment for a long time or the surface of the water-based adhesive is mildewed or corroded when meeting water is avoided, and the color and the quality of the water-based adhesive are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of adhesive preparation, and in particular to a two-component water-based adhesive for automobile interior decoration and a preparation method thereof. Background Art

[0002] Water-based adhesives are environmentally friendly adhesives made from natural or synthetic polymers and water as solvent or dispersant, replacing toxic organic solvents that pollute the environment. Existing water-based adhesives are not 100% solvent-free and may contain limited volatile organic compounds as additives for their aqueous media to control viscosity or fluidity. With the rapid development of science and technology, water-based adhesives are also needed to bond multiple layers of leather when making automotive interiors.

[0003] At present, two-component water-based adhesives used for automotive interiors are prone to agglomeration during the dopamine self-polymerization process, which leads to reduced water dispersibility and antioxidant stability of the water-based adhesives. At the same time, after the water-based adhesives used for automotive interiors are cured, they will become moldy or corroded when they are affected by the environment for a long time or when the surface comes into contact with water, which weakens the anti-mildew performance of the water-based adhesives and makes them easily affected by the external environment. In addition, when the water-based adhesives are used, the surface will change color due to the influence of different environments, affecting the appearance of the car interior.

[0004] Therefore, a two-component water-based adhesive for automobile interior and a preparation method thereof are proposed to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a method for preparing a two-component water-based adhesive for automobile interior decoration, which has strong water dispersibility, strong antioxidant stability, mildew resistance and anti-discoloration, and is applied to the preparation of the two-component water-based adhesive for automobile interior decoration.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a two-component water-based adhesive for automobile interior, and the preparation method is specifically as follows: Step 1: Prepare component A, react oligomer polyol, polyisocyanate, catalyst, solvent, nonionic hydrophilic monomer, small molecule chain extender, sulfonic acid hydrophilic monomer for 2 to 7 hours, then add silane coupling agent, water-based polyurethane and acrylic polymer for stirring to obtain synthetic polyurethane prepolymer, add water for emulsification, stir at 1000 to 3000 r / min for 3 to 10 minutes, stir at 100 to 500 r / min and drop water-soluble or polyamine for 20-40 minutes, add 2D titanium carbide and continue stirring for 1 hour, vacuum remove solvent to obtain emulsion, add bactericidal preservative and water-based thickener to the emulsion to adjust the viscosity of the emulsion to 2000 to 10000 mPas, and obtain component A; Step 2: Prepare a modified B component, add one or more of EP1KOTE6520-WH-53A, WE-375A, JY8350 waterborne epoxy acrylic resin or F0704, N, fluorodichloromethyl thio and N, N-dimethyl-N'-phenylsulfonamide, mix and stir to obtain a modified B component; Step 3: Mix component A and modified component B, then add N,N-dimethylsulfonamide and dimethyl sulfoxide, stir and mix evenly to obtain a two-component water-based adhesive.

[0007] The mass ratio of the two-component water-based adhesive is as follows: based on 100 parts of the solid mass in the prepolymer, the mass fractions of the oligomer polyol, polyisocyanate, catalyst, solvent, small molecule chain extender, sulfonic acid hydrophilic monomer, nonionic hydrophilic monomer and silane coupling agent are (25 to 75): (20 to 40): (0.1 to 0.5): (5 to 50): (0.1 to 10): (0.1 to 30): (0.1 to 15): (0.1 to 8), the mass fractions of the polyamine, water-based thickener, bactericidal preservative and polyurethane prepolymer are (3 to 20): (0.1 to 5): (0.1 to 0.4): 100, 2D Titanium carbide 5 to 10, bactericidal preservative 2 to 5, aqueous thickener 3 to 8, N, fluorodichloromethyl thiosulfate 8 to 15, N, N-dimethyl-N'-phenylsulfonamide 3 to 7, N, N-dimethylsulfonamide 5 to 15, dimethyl sulfoxide 10 to 25.

[0008] The oligomer polyol is any one of polyester polyol, polyether polyol, polyacrylate polyol, hydroxy polyurethane, or a mixture of two or more thereof having a molecular weight of 400 to 4000. The polyisocyanate is any one of isophorone diisocyanate, dicyclohexylmethane diisocyanate or hexamethylene diisocyanate, cyclohexane dimethylene diisocyanate, HDI trimer, IPDI trimer, or a mixture of two or more thereof.

[0009] The catalyst is a metal catalyst including organic tin, organic bismuth, organic lead and organic zinc. The solvent is any one of acetone, methyl ethyl ketone, ethyl acetate, butyl acetate, dimethyl carbonate, and dimethylformamide, or a mixture of two or more thereof; The nonionic hydrophilic monomer is any one or a mixture of two or more of polyethylene glycol monomethyl ether, polyethylene glycol or other monomers containing hydroxyl and ethoxy chain segments with a molecular weight of 400-3000.

[0010] The small molecule chain extender is any one of 1,4-butanediol, ethylene glycol, propylene glycol, methyl propylene glycol, diethylene glycol, 1,4-cyclohexanol, neopentyl glycol, 1,6-hexanediol, hydroquinone-bis(β-hydroxyethyl) ether, resorcinol bis(β-hydroxyethyl) ether, bisphenol A terminated with ethyl oxide, dihydroxyethyl terephthalate, glycerol, trimethylolpropane, and 3,3'-dichloro-4,4-diaminodiphenylmethane, or a mixture of two or more thereof.

[0011] The sulfonic acid hydrophilic monomer is any one or a mixture of two or more of a sulfonic acid diol or an amino sulfonate with a molecular weight of 190 to 3000. The silane coupling agent is any one of an amino silane coupling agent and an epoxy silane coupling agent, or a mixture of two or more thereof.

[0012] The polyamine is any one of isophordione diamine, polyether amine with a molecular weight of 200 to 600, and low molecular weight polyamide polyamine, or a mixture of two thereof.

[0013] The thickener is any one of fumed silica, sodium bentonite, organic bentonite, diatomaceous earth, attapulgite, molecular sieve, silicone gel, methyl cellulose, hydroxypropyl methyl cellulose, sodium carboxymethyl cellulose, hydroxyethyl cellulose, starch, gelatin, sodium alginate, casein, guar gum, chitosan, gum arabic, xanthan gum, soybean protein gum, agar, polycarboxylates, alkali swellable thickeners, and polyurethane thickeners, or a mixture of two or more thereof.

[0014] The bactericidal preservative is any one of isothiazolinone derivatives, benzimidazole esters, and 1,2-benzisothiazolin-3-one, or a mixture of two or more thereof.

[0015] The mass ratio of the A component to the modified B component is 10 to 30:90 to 110; The mass ratio of the N, fluorodichloromethylthio 8 to 15 and N, N-dimethyl-N'-phenylsulfonamide is 5:3; The mass ratio of the N,N-dimethylsulfonamide to dimethyl sulfoxide is 2:3.

[0016] The present invention has the following beneficial effects: 1. In the present invention, a two-component water-based adhesive for automotive interior is prepared by mixing a polyamine with 2D titanium carbide. The polyamine is combined with the 2D titanium carbide, and the chemical reactivity of the polyamine and the water dispersibility of titanium carbide can be utilized to prepare a high-performance water-based adhesive that has good adhesion and can be quickly dispersed in water, so that the water-based adhesive is prevented from agglomerating during the self-polymerization of dopamine, thereby increasing the water dispersibility and antioxidant stability of the water-based adhesive.

[0017] 2. In the present invention, by adding N, fluorodichloromethyl thiosulfate and N, N-dimethyl-N'-phenylsulfonamide, the mildew and corrosion resistance of the prepared water-based adhesive is enhanced. The combination of the two can effectively kill or inhibit the mold microorganisms that appear when the water-based adhesive is affected by the environment, so that the water-based adhesive can maintain a stable sterilization effect under various environments, avoid the water-based adhesive from being affected by the environment for a long time or when the surface is exposed to water, and the mildew or corrosion occurs, thereby extending the service life of the water-based adhesive.

[0018] 3. In the present invention, the water-based adhesive for automobile interior is prepared by mixing N,N-dimethylsulfonamide and dimethyl sulfoxide, which can not only effectively prevent discoloration, but also improve the chemical reaction efficiency of the water-based adhesive. At the same time, N,N-dimethylsulfonamide can help maintain the stability of the chemical structure through its strong solubility and high polarity. N,N-dimethylsulfonamide is not affected by oxidation, and can extend the storage period of the water-based adhesive, reduce the discoloration problem caused by long-term use, extend the aesthetic appearance of the automobile interior, and ensure the color and quality of the water-based adhesive. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a schematic diagram of the overall process of a two-component water-based adhesive for automobile interior and a preparation method thereof. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] Comparative Example A two-component water-based adhesive for automobile interior and a preparation method thereof, comprising the following steps: Step 1: Prepare component A, react oligomer polyol, polyisocyanate, catalyst, solvent, nonionic hydrophilic monomer, small molecule chain extender, sulfonic acid hydrophilic monomer for 2 to 7 hours, then add silane coupling agent, water-based polyurethane and acrylic polymer for stirring to obtain synthetic polyurethane prepolymer, add water for emulsification, stir at 1000 to 3000 r / min for 3 to 10 minutes, and then add water-soluble or polyamine dropwise for 20-40 minutes while stirring at 100 to 500 r / min. After continuing to stir for 1 hour, vacuum remove the solvent to obtain an emulsion, add a bactericidal preservative and an aqueous thickener to the emulsion to adjust the viscosity of the emulsion to 2000 to 10000 mPas, and obtain component A; Step 2: Prepare component B, mix and stir one or more of EP1KOTE6520-WH-53A, WE-375A, JY8350 waterborne epoxy acrylic resin or F0704 to obtain component B; Step 3: Mix component A and component B and stir until they are evenly mixed to obtain a two-component water-based adhesive.

[0022] The comparative example is a preparation step of the prior art for preparing a semi-finished aging-resistant water-based adhesive. The comparative example is compared with Example 1, Example 2 and Example 3. The comparison results are as follows: the comparative example lacks 2D titanium carbide compared with Example 1, the comparative example lacks N, fluorodichloromethylthio and N,N-dimethyl-N'-phenylsulfonamide compared with Example 2, and the comparative example lacks N,N-dimethylsulfonamide and dimethyl sulfoxide compared with Example 3.

[0023] Example 1 Please refer to Figure 1 As shown: A two-component water-based adhesive for automobile interior and a preparation method thereof, comprising the following steps: Step 1: Prepare component A, react oligomer polyol, polyisocyanate, catalyst, solvent, nonionic hydrophilic monomer, small molecule chain extender, sulfonic acid hydrophilic monomer for 2 to 7 hours, then add silane coupling agent, water-based polyurethane and acrylic polymer for stirring to obtain synthetic polyurethane prepolymer, add water for emulsification, stir at 1000 to 3000 r / min for 3 to 10 minutes, stir at 100 to 500 r / min and drop water-soluble or polyamine for 20-40 minutes, add 2D titanium carbide and continue stirring and reacting for 1 hour, vacuum remove solvent to obtain emulsion, add bactericidal preservative and water-based thickener to the emulsion to adjust the viscosity of the emulsion to 2000 to 10000 mPas, and obtain component A; Step 2: Prepare component B, mix and stir one or more of EP1KOTE6520-WH-53A, WE-375A, JY8350 waterborne epoxy acrylic resin or F0704 to obtain component B; Step 3: Mix component A and component B and stir until they are evenly mixed to obtain a two-component water-based adhesive.

[0024] The mass ratio of the two-component water-based adhesive is as follows: based on 100 parts of the solid mass in the prepolymer, the mass fractions of oligomer polyol, polyisocyanate, catalyst, solvent, small molecule chain extender, sulfonic acid hydrophilic monomer, non-ionic hydrophilic monomer and silane coupling agent are (25 to 75): (20 to 40): (0.1 to 0.5): (5 to 50): (0.1 to 10): (0.1 to 30): (0.1 to 15): (0.1 to 8), the mass fractions of polyamine, water-based thickener, bactericidal preservative and polyurethane prepolymer are (3 to 20): (0.1 to 5): (0.1 to 0 .4): 100, 2D titanium carbide 5 to 10, bactericidal preservative 2 to 5, aqueous thickener 3 to 8, N, fluorodichloromethyl sulfide 8 to 15, N,N-dimethyl-N'-phenylsulfonamide 3 to 7, N,N-dimethylsulfonamide 5 to 15, dimethyl sulfoxide 10 to 25.

[0025] The oligomer polyol is any one of polyester polyol, polyether polyol, polyacrylate polyol, hydroxy polyurethane, or a mixture of two or more thereof having a molecular weight of 400 to 4000. The polyisocyanate is any one of isophorone diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, cyclohexane dimethylene diisocyanate, HDI trimer, and IPDI trimer, or a mixture of two or more thereof.

[0026] The catalyst is a metal catalyst including organic tin, organic bismuth, organic lead and organic zinc. The solvent is any one of acetone, methyl ethyl ketone, ethyl acetate, butyl acetate, dimethyl carbonate, and dimethylformamide, or a mixture of two or more thereof; The nonionic hydrophilic monomer is any one or a mixture of two or more of polyethylene glycol monomethyl ether, polyethylene glycol or other monomers containing hydroxyl and ethoxy chain segments with a molecular weight of 400-3000.

[0027] The small molecule chain extender is any one of 1,4-butanediol, ethylene glycol, propylene glycol, methyl propylene glycol, diethylene glycol, 1,4-cyclohexanol, neopentyl glycol, 1,6-hexanediol, hydroquinone-bis(β-hydroxyethyl) ether, resorcinol bis(β-hydroxyethyl) ether, bisphenol A terminated with ethyl oxide, dihydroxyethyl terephthalate, glycerol, trimethylolpropane, and 3,3'-dichloro-4,4-diaminodiphenylmethane, or a mixture of two or more thereof.

[0028] The sulfonic acid hydrophilic monomer is any one or a mixture of two or more of a sulfonic acid diol or an amino sulfonate with a molecular weight of 190 to 3000. The silane coupling agent is any one of an amino silane coupling agent and an epoxy silane coupling agent, or a mixture of two or more thereof.

[0029] Through the above-mentioned ratio, the preparation of the two-component water-based adhesive for automobile interior in Example 1 and the comparative example has the following advantages: the water dispersibility of the water-based adhesive can be increased, and the chemical reactivity of the polyamine and the water dispersibility of titanium carbide can be utilized to prepare a high-performance water-based adhesive that has good adhesion and can be quickly dispersed in water, so that the water-based adhesive is prevented from agglomerating during the dopamine self-polymerization process, thereby increasing the water dispersibility and antioxidant stability of the water-based adhesive.

[0030] Example 2 Please refer to Figure 1 As shown: A two-component water-based adhesive for automobile interior and a preparation method thereof, comprising the following steps: Step 1: Prepare component A, react oligomer polyol, polyisocyanate, catalyst, solvent, nonionic hydrophilic monomer, small molecule chain extender, sulfonic acid hydrophilic monomer for 2 to 7 hours, then add silane coupling agent, water-based polyurethane and acrylic polymer for stirring to obtain synthetic polyurethane prepolymer, add water for emulsification, stir at 1000 to 3000 r / min for 3 to 10 minutes, and then add water-soluble or polyamine dropwise for 20-40 minutes while stirring at 100 to 500 r / min. After continuing to stir for 1 hour, vacuum remove the solvent to obtain an emulsion, add a bactericidal preservative and an aqueous thickener to the emulsion to adjust the viscosity of the emulsion to 2000 to 10000 mPas, and obtain component A; Step 2: Prepare a modified B component, add one or more of EP1KOTE6520-WH-53A, WE-375A, JY8350 waterborne epoxy acrylic resin or F0704, N, fluorodichloromethyl thio and N, N-dimethyl-N'-phenylsulfonamide, mix and stir to obtain a modified B component; Step 3: Mix component A and modified component B and stir until they are evenly mixed to obtain a two-component water-based adhesive.

[0031] The polyamine is any one of isophordione diamine, polyether amine with a molecular weight of 200 to 600, and low molecular weight polyamide polyamine, or a mixture of two thereof.

[0032] The thickener is any one of fumed silica, sodium bentonite, organic bentonite, diatomaceous earth, attapulgite, molecular sieve, silicone gel, methyl cellulose, hydroxypropyl methyl cellulose, sodium carboxymethyl cellulose, hydroxyethyl cellulose, starch, gelatin, sodium alginate, casein, guar gum, chitosan, gum arabic, xanthan gum, soy protein gum, agar, polycarboxylates, alkali swellable thickeners, and polyurethane thickeners, or a mixture of two or more thereof.

[0033] The bactericidal preservative is any one of isothiazolinone derivatives, benzimidazole esters, and 1,2-benzisothiazolin-3-one, or a mixture of two or more thereof.

[0034] Through the above ratio, the mildew and anti-corrosion properties of the prepared water-based adhesive are enhanced. The combination of the two can effectively kill or inhibit the mold microorganisms that appear when the water-based adhesive is affected by the environment, so that the water-based adhesive can maintain a stable bactericidal effect in a variety of environments, avoiding the water-based adhesive from being affected by the environment for a long time or when the surface comes into contact with water, causing mold or corrosion.

[0035] Example 3 Please refer to Figure 1 As shown: A two-component water-based adhesive for automobile interior and a preparation method thereof, comprising the following steps: Step 1: Prepare component A, react oligomer polyol, polyisocyanate, catalyst, solvent, nonionic hydrophilic monomer, small molecule chain extender, sulfonic acid hydrophilic monomer for 2 to 7 hours, then add silane coupling agent, water-based polyurethane and acrylic polymer for stirring to obtain synthetic polyurethane prepolymer, add water for emulsification, stir at 1000 to 3000 r / min for 3 to 10 minutes, and then add water-soluble or polyamine dropwise for 20-40 minutes while stirring at 100 to 500 r / min. After continuing to stir for 1 hour, vacuum remove the solvent to obtain an emulsion, add a bactericidal preservative and an aqueous thickener to the emulsion to adjust the viscosity of the emulsion to 2000 to 10000 mPas, and obtain component A; Step 2: Prepare component B, mix and stir one or more of EP1KOTE6520-WH-53A, WE-375A, JY8350 waterborne epoxy acrylic resin or F0704 to obtain component B; Step 3: Mix component A and modified component B, then add N,N-dimethylsulfonamide and dimethyl sulfoxide, stir and mix evenly to obtain a two-component water-based adhesive.

[0036] The mass ratio of component A to modified component B is 10 to 30:90 to 110; The mass ratio of N, fluorodichloromethylsulfide 8 to 15 and N,N-dimethyl-N'-phenylsulfonamide is 5:3; The mass ratio of N,N-dimethylsulfonamide to dimethyl sulfoxide is 2:3.

[0037] Through the above-mentioned ratio, the preparation of the two-component water-based adhesive for automotive interior in Example 3 and the comparative example has the following advantages: mixing N,N-dimethylsulfonamide and dimethyl sulfoxide can not only effectively prevent discoloration, but also improve the chemical reaction efficiency of the water-based adhesive. At the same time, N,N-dimethylsulfonamide can help maintain the stability of the chemical structure through its strong solubility and high polarity, and reduce discoloration caused by structural changes. In addition, N,N-dimethylsulfonamide is not affected by oxidation, and can extend the storage life of the water-based adhesive and reduce the discoloration problem caused by long-term use.

[0038] Comparative Example 1 The two-component water-based adhesive for automobile interior provided in this comparative example is substantially the same as that in Example 1, the main difference is that in Example 1, the polyamine and 2D titanium carbide are mixed and reacted.

[0039] Comparative Example 2 The two-component water-based adhesive for automobile interior provided in this comparative example is substantially the same as that in Example 1, the main difference is that in Example 2, N,N-dichlorofluoromethylthioate and N,N-dimethyl-N'-phenylsulfonamide are mixed for reaction.

[0040] Comparative Example 3 The two-component water-based adhesive for automobile interior provided in this comparative example is substantially the same as that in Example 1, the main difference is that in Example 3, N,N-dimethylsulfonamide and dimethyl sulfoxide are mixed for reaction.

[0041] The test results of water dispersibility, mildew resistance and anti-discoloration time are shown in Table 1 below: Table 1: Tests of water dispersibility, mildew resistance and anti-discoloration duration by contact angle measurement and UV irradiation:

[0042] It can be seen from the test results in the above table that the two-component water-based adhesive for automotive interior prepared in Example 1, Example 2 and Example 3, compared with the comparative example, prevents the water-based adhesive from agglomerating during the dopamine self-polymerization process, thereby increasing the water dispersibility and antioxidant stability of the water-based adhesive, enhancing the anti-mildew performance, extending the service life of the water-based adhesive, and being able to extend the storage period of the water-based adhesive, and reducing the discoloration problem caused by long-term use.

[0043] The present invention provides a two-component water-based adhesive for automobile interior decoration and a preparation method thereof. In the operation of the method, firstly, oligomer polyol, polyisocyanate, catalyst, solvent, nonionic hydrophilic monomer, small molecule chain extender, and sulfonic acid hydrophilic monomer are reacted for 2 to 7 hours, and then a silane coupling agent, water-based polyurethane and acrylic polymer are added and stirred to obtain a synthetic polyurethane prepolymer, and water is added for emulsification, and after stirring at 1000 to 3000 r / min for 3 to 10 minutes, a water-soluble or polyamine is added dropwise at 100 to 500 r / min for 20-40 minutes, and 2D titanium carbide is added and stirred for 1 hour, and then the solvent is removed in vacuo to obtain an emulsion. , add a bactericidal preservative and an aqueous thickener to the emulsion to adjust the viscosity of the emulsion to 2000 to 10000 mPas to obtain component A, and the water dispersibility of the water-based glue can be increased by combining the polyamine with 2D titanium carbide. The chemical reactivity of the polyamine and the water dispersibility of titanium carbide can be used to prepare a high-performance water-based adhesive that has good adhesion and can be quickly dispersed in water, so that the water-based adhesive is prevented from agglomerating during the self-polymerization of dopamine, thereby increasing the water dispersibility and antioxidant stability of the water-based adhesive; EP1KOTE6520-WH-53A, WE-375A, JY8350 water-based epoxy acrylic resin or F0 704, adding N,N-dichlorofluoromethyl thiosulfate and N,N-dimethyl-N'-phenylsulfonamide, mixing and stirring to obtain a modified B component, wherein the combination of N,N-dichlorofluoromethyl thiosulfate and N,N-dimethyl-N'-phenylsulfonamide can effectively kill or inhibit the mold microorganisms that appear when the water-based adhesive is affected by the environment, so that the water-based adhesive can maintain a stable sterilization effect under various environments, and avoid the water-based adhesive from being affected by the environment for a long time or the surface is exposed to water, resulting in mold or corrosion, thereby enhancing the anti-mold performance of the water-based adhesive and extending the service life of the water-based adhesive; mixing component A and modified component B, and then adding N, N-dimethylsulfonamide and dimethyl sulfoxide are stirred and mixed evenly to obtain a two-component water-based adhesive. The water-based adhesive for automotive interiors prepared by mixing N,N-dimethylsulfonamide and dimethyl sulfoxide can not only effectively prevent discoloration, but also improve the chemical reaction efficiency of the water-based adhesive. At the same time, N,N-dimethylsulfonamide can help maintain the stability of the chemical structure and reduce discoloration caused by structural changes through its strong solubility and high polarity. N,N-dimethylsulfonamide is not affected by oxidation, and can extend the storage period of the water-based adhesive, reduce discoloration problems caused by long-term use, extend the aesthetic appearance of the automotive interior, and ensure the color and quality of the water-based adhesive.

[0044] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing a two-component water-based adhesive for automobile interior, characterized in that: The preparation method is specifically: Step 1: Prepare component A, react oligomer polyol, polyisocyanate, catalyst, solvent, nonionic hydrophilic monomer, small molecule chain extender, sulfonic acid hydrophilic monomer for 2 to 7 hours, then add silane coupling agent, water-based polyurethane and acrylic polymer for stirring to obtain synthetic polyurethane prepolymer, add water for emulsification, stir at 1000 to 3000 r / min for 3 to 10 minutes, stir at 100 to 500 r / min and drop water-soluble or polyamine for 20-40 minutes, add 2D titanium carbide and continue stirring and reacting for 1 hour, vacuum remove solvent to obtain emulsion, add bactericidal preservative and water-based thickener to the emulsion to adjust the viscosity of the emulsion to 2000 to 10000 mPas, and obtain component A; Step 2: Prepare a modified B component, add one or more of EP1KOTE6520-WH-53A, WE-375A, JY8350 waterborne epoxy acrylic resin or F0704, N, fluorodichloromethyl thio and N, N-dimethyl-N'-phenylsulfonamide, mix and stir to obtain a modified B component; Step 3: Mix component A and modified component B, then add N,N-dimethylsulfonamide and dimethyl sulfoxide, stir and mix evenly to obtain a two-component water-based adhesive.

2. The preparation method according to claim 1, characterized in that: The mass ratio of the two-component water-based adhesive is as follows: based on 100 parts of the solid mass in the prepolymer, the mass fractions of the oligomer polyol, polyisocyanate, catalyst, solvent, small molecule chain extender, sulfonic acid hydrophilic monomer, nonionic hydrophilic monomer and silane coupling agent are (25 to 75): (20 to 40): (0.1 to 0.5): (5 to 50): (0.1 to 10): (0.1 to 30): (0.1 to 15): (0.1 to 8), and the mass fractions of the polyamine, water-based thickener, bactericidal preservative and polyurethane prepolymer are (3 to 20): (0.1 to 5): (0.1 to 0 .4): 100, 2D titanium carbide 5 to 10, bactericidal preservative 2 to 5, aqueous thickener 3 to 8, N, fluorodichloromethyl sulfide 8 to 15, N,N-dimethyl-N'-phenylsulfonamide 3 to 7, N,N-dimethylsulfonamide 5 to 15, dimethyl sulfoxide 10 to 25.

3. The preparation method according to claim 1, characterized in that: The oligomer polyol is any one of polyester polyol, polyether polyol, polyacrylate polyol, hydroxy polyurethane, or a mixture of two or more thereof having a molecular weight of 400 to 4000. The polyisocyanate is any one of isophorone diisocyanate, dicyclohexylmethane diisocyanate or hexamethylene diisocyanate, cyclohexane dimethylene diisocyanate, HDI trimer, IPDI trimer, or a mixture of two or more thereof.

4. The preparation method according to claim 1, characterized in that: The catalyst is a metal catalyst including organic tin, organic bismuth, organic lead and organic zinc. The solvent is any one of acetone, methyl ethyl ketone, ethyl acetate, butyl acetate, dimethyl carbonate, and dimethylformamide, or a mixture of two or more thereof; The nonionic hydrophilic monomer is any one or a mixture of two or more of polyethylene glycol monomethyl ether, polyethylene glycol or other monomers containing hydroxyl and ethoxy chain segments with a molecular weight of 400-3000.

5. The preparation method according to claim 1, characterized in that: The small molecule chain extender is any one of 1,4-butanediol, ethylene glycol, propylene glycol, methyl propylene glycol, diethylene glycol, 1,4-cyclohexanol, neopentyl glycol, 1,6-hexanediol, hydroquinone-bis(β-hydroxyethyl) ether, resorcinol bis(β-hydroxyethyl) ether, bisphenol A terminated with ethyl oxide, dihydroxyethyl terephthalate, glycerol, trimethylolpropane, and 3,3'-dichloro-4,4-diaminodiphenylmethane, or a mixture of two or more thereof.

6. The preparation method according to claim 1, characterized in that: The sulfonic acid hydrophilic monomer is any one or a mixture of two or more of a sulfonic acid diol or an amino sulfonate with a molecular weight of 190 to 3000. The silane coupling agent is any one of an amino silane coupling agent and an epoxy silane coupling agent, or a mixture of two or more thereof.

7. The preparation method according to claim 1, characterized in that: The polyamine is any one of isophordione diamine, polyether amine with a molecular weight of 200 to 600, and low molecular weight polyamide polyamine, or a mixture of two thereof.

8. The preparation method according to claim 1, characterized in that: The thickener is any one of fumed silica, sodium bentonite, organic bentonite, diatomaceous earth, attapulgite, molecular sieve, silicone gel, methyl cellulose, hydroxypropyl methyl cellulose, sodium carboxymethyl cellulose, hydroxyethyl cellulose, starch, gelatin, sodium alginate, casein, guar gum, chitosan, gum arabic, xanthan gum, soybean protein gum, agar, polycarboxylates, alkali swellable thickeners, and polyurethane thickeners, or a mixture of two or more thereof.

9. The preparation method according to claim 1, characterized in that: The bactericidal preservative is any one of isothiazolinone derivatives, benzimidazole esters, and 1,2-benzisothiazolin-3-one, or a mixture of two or more thereof.

10. The preparation method according to claim 1, characterized in that: The mass ratio of the A component to the modified B component is 10 to 30:90 to 110; The mass ratio of the N, fluorodichloromethylthio 8 to 15 and N, N-dimethyl-N'-phenylsulfonamide is 5:3; The mass ratio of the N,N-dimethylsulfonamide to dimethyl sulfoxide is 2:3.

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