CN-122011925-A - High-wear-resistance and light-resistance automotive interior surface treatment agent and preparation method thereof

CN122011925ACN 122011925 ACN122011925 ACN 122011925ACN-122011925-A

Abstract

The invention discloses a high wear-resistant and light-resistant automotive interior surface treating agent and a preparation method thereof, and relates to the technical fields of fine chemical engineering and automotive interior materials. The treating agent consists of 60-80 parts of aliphatic waterborne polyurethane resin dispersoid, 5-15 parts of wear-resistant and scratch-resistant auxiliary agent, 1-3 parts of waterborne crosslinking agent, auxiliary agent and the like, wherein the wear-resistant and scratch-resistant auxiliary agent is a compound of photostable weather-resistant surface hydrophilically modified nano silica sol and polytetrafluoroethylene wax emulsion. The surface of the nano silicon dioxide is chemically modified by the silane coupling agent mixed solution, the light stabilizer and the hydrophilic modifier, and the nano silicon dioxide is compounded with the polytetrafluoroethylene wax emulsion, so that the problems of easy agglomeration of nano particles, easy migration of the light stabilizer and insufficient wear resistance and weather resistance in the prior art are solved. The surface treating agent prepared by the invention has excellent wear resistance, scratch resistance, long-acting light resistance and weather resistance and good dispersion stability, and is suitable for surface treatment of automotive interior trim parts.

Inventors

LUO BIN
LI RENHONG
LIU YINWEN
LI JUN
ZHONG YUANHUI
CHEN YUAN

Assignees

重庆韩拓科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260313

Claims (10)

1. The high wear-resistant and light-resistant automotive interior surface treatment agent is characterized by comprising the following raw materials, by weight, 60-80 parts of aliphatic aqueous polyurethane resin dispersion, 5-15 parts of wear-resistant and scratch-resistant auxiliary agents, 1-3 parts of aqueous cross-linking agents, 0.2-1 part of wetting leveling agents, 0.1-0.5 part of defoaming agents, 0.5-2 parts of light-resistant and weather-resistant agents and 10-20 parts of deionized water; The wear-resistant and scratch-resistant auxiliary agent is a compound of nano silicon dioxide sol with a hydrophilically modified light-stable weather-resistant surface and polytetrafluoroethylene wax emulsion.
2. The high abrasion and light resistance automotive interior surface treatment agent according to claim 1, wherein the aliphatic aqueous polyurethane resin dispersion is selected from one or more of a polycarbonate anionic aliphatic polyurethane dispersion or a polyester anionic aliphatic polyurethane dispersion having a solid content of 35 to 45% by weight; The aqueous cross-linking agent is selected from hydrophilic modified hexamethylene diisocyanate trimer; the wetting and leveling agent is one or more selected from polyether modified polydimethylsiloxane and fluorocarbon modified polyacrylate; The defoamer is one or more selected from mineral oil defoamer and polyether siloxane copolymer emulsion defoamer; the light-resistant weather-resistant agent is selected from one or more of bis (1, 2, 6-pentamethyl-4-piperidyl) sebacate and 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole.
3. The high wear-resistant and light-resistant automotive interior surface treatment agent according to claim 1, wherein the photostable weather-resistant surface hydrophilically modified nano silica sol is prepared by modifying nano silica sol through a reaction of a silane coupling agent mixed solution, a light stabilizer and a hydrophilization modifier; The silane coupling agent mixed solution consists of N- (beta-aminoethyl) -gamma-aminopropyl trimethoxysilane, gamma-glycidoxypropyl trimethoxysilane and 3- (2, 3-glycidoxypropyl) propyl methyl diethoxy silane; the light stabilizer is 1- (alpha- (benzotriazole-1-yl) benzyl) -2-naphthol; the hydrophilic modifier is polyethylene glycol monomethyl ether methacrylate.
4. A highly abrasion-resistant and light-resistant automotive interior surface treatment agent according to claim 1 or 3, wherein the mass ratio of the solid content of the photostable weather-resistant surface hydrophilically modified nano silica sol to the solid content of the polytetrafluoroethylene wax emulsion in the abrasion-resistant and scratch-resistant auxiliary agent is 3:1 to 5:1; The particle size of the nano silicon dioxide particles in the nano silicon dioxide sol with the hydrophilically modified light-stable weather-resistant surface is 10-50 nanometers; the polytetrafluoroethylene wax emulsion has an average particle size of 0.2 to 0.5 microns.
5. A method for producing the highly abrasion-resistant and light-resistant automotive interior surface treatment agent according to any one of claims 1 to 4, comprising the steps of: Firstly, preparing a wear-resistant scratch-resistant auxiliary agent: S1, heating nano silicon dioxide sol, dropwise adding a silane coupling agent mixed solution into a reaction system, adding a light stabilizer for reaction after reaction, then cooling, adding a hydrophilic modifier polyethylene glycol monomethyl ether methacrylate, and regulating the pH value to obtain the photo-stable weather-resistant surface hydrophilic modified nano silicon dioxide sol; S2, mixing polytetrafluoroethylene wax powder with an emulsifying agent and deionized water, and homogenizing and emulsifying by a high-pressure homogenizer to obtain polytetrafluoroethylene wax emulsion; s3, adding the nano silicon dioxide sol with the hydrophilically modified light-stable weather-resistant surface prepared in the step S1 and the polytetrafluoroethylene wax emulsion prepared in the step S2 into a mixing kettle, stirring and mixing, adjusting the pH value, and filtering to obtain the wear-resistant and scratch-resistant auxiliary agent; secondly, preparing a surface treating agent: Adding the aliphatic aqueous polyurethane resin dispersoid and deionized water into a dispersing cylinder for stirring, sequentially adding a wetting leveling agent, a defoaming agent and a light-resistant weather-resistant agent, dispersing at a high speed, then reducing the stirring speed, adding the wear-resistant and scratch-resistant auxiliary agent prepared in the first step for continuous stirring, finally adding an aqueous cross-linking agent for uniform stirring, and filtering to obtain the high wear-resistant and light-resistant automotive interior surface treating agent.
6. The method for preparing a highly wear-resistant and light-resistant automotive interior surface treatment agent according to claim 5, wherein in the step S1, the silane coupling agent mixed solution is composed of N- (beta-aminoethyl) -gamma-aminopropyl trimethoxysilane, gamma-glycidoxypropyl trimethoxysilane and 3- (2, 3-glycidoxypropyl) propylmethyl diethoxysilane according to a mass ratio of 1:1:0.5, the solid content of the nano silica sol is 20-30% by weight, and 5-15 parts by weight of the silane coupling agent mixed solution is dropwise added to 100 parts by weight of the nano silica sol.
7. The preparation method of the high wear-resistant and light-resistant automotive interior surface treatment agent according to claim 5, wherein in the step S1, the temperature of a reaction system is raised to 60-80 ℃, the heat preservation reaction is carried out for 2-4 hours after the silane coupling agent mixed solution is dripped, the heat preservation reaction is continued for 1-2 hours after the light stabilizer is added, the temperature is lowered to 40-50 ℃, the hydrophilic modifier is added, the pH value is regulated to 8.0-9.0, and the stirring reaction is carried out for 1 hour.
8. The preparation method of the high wear-resistant and light-resistant automotive interior surface treatment agent according to claim 5, wherein in the step S2, the emulsifier is formed by compounding sodium dodecyl sulfate and polyoxyethylene nonylphenol ether according to a mass ratio of 2:1, the mass ratio of polytetrafluoroethylene wax powder to emulsifier to deionized water is 20:3:77, the homogenizing and emulsifying pressure is 40-60 megapascals, the temperature is 80-90 ℃, the homogenizing and emulsifying times are 3, and the homogenizing time is 5 minutes each time.
9. The method for producing a highly abrasion-resistant and light-resistant automotive interior surface treatment agent according to claim 5, wherein in step S3, the stirring speed is 200 to 400 rpm, the temperature is 25 to 40 degrees centigrade, the stirring and mixing time is 30 to 60 minutes, and the pH is adjusted to 7.0 to 8.0.
10. The method for producing a highly abrasion-resistant and light-resistant automotive interior surface treatment agent according to claim 5, wherein in the second step, the stirring speed after adding the aliphatic aqueous polyurethane resin dispersion and deionized water is 300 to 600 rpm, the stirring time is 5 to 10 minutes, the high-speed dispersion speed after adding the wetting and leveling agent, the antifoaming agent and the weather-resistant agent is 800 to 1200 rpm, the dispersing time is 15 to 20 minutes, and the stirring speed after adding the abrasion-resistant and scratch-resistant auxiliary agent is 400 to 600 rpm, and the stirring time is 20 to 30 minutes.

Description

High-wear-resistance and light-resistance automotive interior surface treatment agent and preparation method thereof Technical Field The invention relates to the technical field of fine chemical engineering and automotive interior materials, in particular to an automotive interior surface treating agent with high wear resistance and light resistance and a preparation method thereof. Background With the rapid development of the automobile industry and the improvement of the driving experience requirements of consumers, the surface quality of automobile interior parts such as instrument panels, door panels, seat leather and the like is receiving a great deal of attention. In order to meet increasingly strict environmental regulations, water-based coatings with low emission of volatile organic compounds gradually replace traditional solvent-based coatings, and become a mainstream choice for surface treatment of automotive interiors. Among them, aliphatic aqueous polyurethane resin dispersions are widely used in matrix resins of interior surface treatment agents due to their good flexibility, adhesion and solvent resistance. However, compared with solvent-based systems, the simple aqueous polyurethane coating often has defects in terms of surface mechanical strength, wear resistance and light and weather resistance, and is difficult to directly meet the long-term use requirements of automobile interiors in severe environments such as high temperature, high humidity and strong ultraviolet irradiation. In order to improve the mechanical properties of the coating, the prior art is generally modified by adding abrasion-resistant and scratch-resistant auxiliaries. The common wear-resistant agent comprises inorganic particles such as nano silicon dioxide, and the scratch-resistant agent is polyethylene wax or polytetrafluoroethylene wax emulsion. However, the direct addition of inorganic nanoparticles into aqueous systems has the obvious defect that the nanoparticles have extremely high surface energy, are extremely easy to generate agglomeration phenomenon, and are unevenly dispersed in aqueous resin, so that the nano reinforcing effect of the nanoparticles cannot be effectively exerted, and the coating can be whitened, the haze is increased, and the appearance of the interior decoration is seriously influenced. In addition, the interface compatibility between the inorganic particles and the organic resin matrix is poor, the binding force is weak, and when the inorganic particles are rubbed by external force, the particles are easy to fall off from the surface of the coating, and the abrasion resistance of the coating is reduced. The smooth hand feeling can be provided by simply relying on wax emulsion, but enough hardness support cannot be provided, and the dual requirements of high wear resistance and high scratch resistance are difficult to be met. In the aspect of light resistance and weather resistance, the automotive interior is extremely easy to age, change color and crack after being exposed to sunlight penetrating through the automobile window for a long time. In the prior art, an ultraviolet absorber or a hindered amine light stabilizer is added in a physical blending mode. The small molecule light stabilizer is not chemically bonded with the resin matrix, is easy to migrate in the long-term use process, floats out of the surface or volatilizes and runs off, so that the frosting phenomenon and the light stability failure are caused, and the long-term protection effect cannot be provided. Therefore, the automobile interior surface treatment agent which can overcome the defects of poor dispersion stability, weak interface binding force, easy migration and failure of light stabilizer and the like of inorganic nano wear-resistant particles in an aqueous system and has high wear resistance, high scratch resistance, excellent long-acting light resistance and weather resistance is developed. Disclosure of Invention The invention aims to provide a high wear-resistant and light-resistant automotive interior surface treatment agent and a preparation method thereof, which are used for solving the technical problems that inorganic nano particles in the automotive interior surface treatment agent are easy to agglomerate, wear resistance and touch are difficult to take account, and light stabilizer is easy to migrate to cause weather resistance failure in the prior art. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The automobile interior surface treatment agent with high wear resistance and light resistance comprises, by weight, 60-80 parts of aliphatic aqueous polyurethane resin dispersion, 5-15 parts of wear-resistant and scratch-resistant auxiliary agents, 1-3 parts of aqueous cross-linking agents, 0.2-1 part of wetting leveling agents, 0.1-0.5 part of defoaming agents, 0.5-2 parts of light-resistant and weather-resistant agents and 10-20 parts of deionized water