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CN-121780017-B - Composite polyurethane emulsion, skin material and corresponding preparation method

CN121780017BCN 121780017 BCN121780017 BCN 121780017BCN-121780017-B

Abstract

The invention relates to the field of high polymer materials, and discloses a composite polyurethane emulsion, a skin material and a corresponding preparation method. The preparation method of the composite polyurethane emulsion comprises the following steps of preparing SiO 2 aqueous dispersion, pre-hydrolyzing fibers in alkali liquor to obtain fiber dispersion, mixing the SiO 2 aqueous dispersion and the fiber dispersion, stirring and post-treating to obtain fibrillated fibers, wrapping polyurethane coating on the surfaces of the fibrillated fibers to obtain wrapped fibers, and adding the wrapped fibers, the SiO 2 aqueous dispersion and other additives into the aqueous polyurethane emulsion and stirring to obtain the composite polyurethane emulsion. The invention can improve the wear resistance and self-cleaning performance of the surface material.

Inventors

  • HUANG YI
  • JIANG JINGYANG
  • ZHANG SHENGMING
  • Chen Zhenkan
  • ZHAO CHAOYUE
  • XIE XIAOLONG
  • HE JINGYU
  • GONG DUDI
  • WANG XING

Assignees

  • 申达(上海)科技有限公司

Dates

Publication Date
20260508
Application Date
20260305

Claims (10)

  1. 1. The preparation method of the composite polyurethane emulsion is characterized by comprising the following steps of: S11, preparing SiO 2 aqueous dispersion liquid; S12, pre-hydrolyzing the fiber in alkali liquor to obtain fiber dispersion liquid; s13, mixing the SiO 2 aqueous dispersion and the fiber dispersion, and stirring and post-treating to obtain fibrillated fibers; S14, wrapping a polyurethane coating on the surface of the fibrillated fiber to obtain a wrapped fiber; And S15, adding the wrapped fiber, the SiO 2 aqueous dispersion and other auxiliary agents into the aqueous polyurethane emulsion, and stirring to obtain the composite polyurethane emulsion.
  2. 2. The method according to claim 1, wherein the step S11 comprises mixing SiO 2 powder having a particle size of 5-10 μm with water in a mass ratio of 1 (3-7) and stirring at 1500-2500 rpm, and then adding a silane coupling agent and stirring at 400-600 rpm.
  3. 3. The method according to claim 1, wherein the step S12 comprises adding the fiber and a dispersant to an alkali solution with a mass concentration of 5-30%, and stirring at a speed of 100-200 rpm for 1-2 hours at 80-120 ℃ to obtain the fiber dispersion, wherein the mass ratio of the fiber to the alkali solution is 1 (30-50), and the fiber is hyperbranched fiber modified by a branching agent in the step S12.
  4. 4. The method according to claim 1, wherein in the step S13, the mass ratio of the SiO 2 aqueous dispersion to the fiber dispersion is 1 (10-20), stirring is performed at a rotation speed of 5000-20000 rpm for 10-20 min, and the post-treatment is performed by washing with water and then drying.
  5. 5. The method according to claim 1, wherein step S14 comprises immersing the fibrillated fibers in an aqueous polyurethane emulsion having a mass concentration of 1-5% and then drying.
  6. 6. The method according to claim 1, wherein the step S15 comprises the steps of adding the wrapped fiber and the SiO 2 aqueous dispersion into an aqueous polyurethane emulsion, stirring at 400-600 rpm for 5-15 min, adding other auxiliary agents, and continuing stirring for 20-40 min, wherein in the step S15, the mass ratio of the wrapped fiber to the aqueous polyurethane emulsion is 1 (50-100), and the mass ratio of the SiO 2 aqueous dispersion to the aqueous polyurethane emulsion is 1 (10-20).
  7. 7. A composite polyurethane emulsion prepared by the method of any one of claims 1-6.
  8. 8. The preparation method of the wear-resistant skin material with the self-cleaning function is characterized by comprising the following steps of: s21, preparing a substrate layer; s22, forming a pattern layer on the surface of the substrate layer; S23, coating the composite polyurethane emulsion according to claim 7 on the surface of the substrate layer on which the pattern layer is formed, so as to form a wear-resistant layer.
  9. 9. The method according to claim 8, wherein in step S21, the substrate layer is prepared using a mixture comprising a thermoplastic material and a polyurethane graft modifier, wherein the mass of the polyurethane graft modifier is 1-10% of the mass of the thermoplastic material.
  10. 10. A self-cleaning wear-resistant skin material prepared by the method of claim 8 or 9.

Description

Composite polyurethane emulsion, skin material and corresponding preparation method Technical Field The invention relates to the technical field of high polymer materials, in particular to a composite polyurethane emulsion, a wear-resistant skin material with a self-cleaning function and a corresponding preparation method. Background Carpets are an important component in automotive interiors for providing many functions such as slip resistance, dirt resistance, aesthetics, vibration resistance, etc. Traditional plastic carpets are easy to be stained with dust and stains, and the cleaning and maintenance cost is high. In the prior art, some products have improved stain resistance by forming a surface coating in the carpet skin, but are subject to wear after prolonged use. The patent CN120039002A discloses a colorful TPO inner-decorating foot pad skin and a preparation method thereof, wherein the colorful TPO inner-decorating foot pad skin sequentially comprises a surface functional layer, a colorful pattern layer, a substrate layer and a bottom layer structure from outside to inside, the surface functional layer is used for improving wear resistance, the surface functional layer comprises 40-80 parts by weight of matte water-based PUD resin, 5-20 parts by weight of matte water-based PUA resin, 1-10 parts by weight of wear-resistant auxiliary agent, 5-8 parts by weight of cross-linking agent and 0-30 parts by weight of diluent, and the wear-resistant auxiliary agent adopts ultra-high molecular weight polysiloxane dispersoid. The surface functional layer in this patent is capable of improving wear resistance but is not concerned with improving self-cleaning properties. Based on this, it is necessary to develop a skin material having both abrasion-resistant and self-cleaning properties and a coating for forming a corresponding coating layer in the skin. Disclosure of Invention The invention mainly aims to provide a composite polyurethane emulsion, a wear-resistant skin material with a self-cleaning function and a corresponding preparation method, so as to solve the technical problem of how to improve the wear resistance and self-cleaning performance of the skin material. According to one aspect of the invention, a preparation method of a composite polyurethane emulsion is provided, which comprises the following steps of S11, preparing an SiO 2 aqueous dispersion, S12, pre-hydrolyzing fibers in alkali liquor to obtain a fiber dispersion, S13, mixing the SiO 2 aqueous dispersion and the fiber dispersion, stirring and post-treating to obtain fibrillated fibers, S14, wrapping polyurethane coating on the surfaces of the fibrillated fibers to obtain wrapped fibers, and S15, adding the wrapped fibers, the SiO 2 aqueous dispersion and other additives into the aqueous polyurethane emulsion, and stirring to obtain the composite polyurethane emulsion. According to one embodiment of the invention, step S11 comprises mixing SiO 2 powder with a particle size of 5-10 μm with water in a mass ratio of 1 (3-7) and stirring at a rotation speed of 1500-2500 rpm, then adding a silane coupling agent and stirring at a rotation speed of 400-600 rpm. According to one embodiment of the invention, the step S12 comprises the steps of adding the fiber and the dispersing agent into alkali liquor with the mass concentration of 5-30%, and stirring at the speed of 100-200 rpm for 1-2 hours at the temperature of 80-120 ℃ to obtain fiber dispersion, wherein the mass ratio of the fiber to the alkali liquor is 1 (30-50), and in the step S12, the fiber is hyperbranched fiber modified by a branching agent. According to one embodiment of the invention, in the step S13, the mass ratio of the SiO 2 aqueous dispersion to the fiber dispersion is 1 (10-20), stirring is carried out at a rotation speed of 5000-20000 rpm for 10-20 min, and post-treatment is carried out by washing with water and then drying. According to one embodiment of the invention, step S14 comprises immersing fibrillated fibers in an aqueous polyurethane emulsion having a mass concentration of 1-5% and then drying. According to one embodiment of the invention, the step S15 comprises the steps of adding the wrapped fiber and SiO 2 aqueous dispersion into the aqueous polyurethane emulsion, stirring at 400-600 rpm for 5-15 min, adding other auxiliary agents, and continuing stirring for 20-40 min, wherein in the step S15, the mass ratio of the wrapped fiber to the aqueous polyurethane emulsion is 1 (50-100), and the mass ratio of the SiO 2 aqueous dispersion to the aqueous polyurethane emulsion is 1 (10-20). According to another aspect of the present invention, a syntactic polyurethane emulsion is provided, prepared by the method described above. According to another aspect of the invention, a preparation method of the wear-resistant skin material with a self-cleaning function is provided, and the preparation method comprises the following steps of S21, preparing a substrate layer, S22, for