Search

CN-121992667-A - Water-based polyurethane coating for textile fabric

CN121992667ACN 121992667 ACN121992667 ACN 121992667ACN-121992667-A

Abstract

The invention relates to the technical field of textile functional coatings, and discloses a water-based polyurethane coating for textile fabrics, which is a synergistic innovation of polyether-polyester specific proportion copolymerization soft segment design, amino silicone oil and hydroxy acrylic ester collaborative end-capping, carbodiimide and epoxy silane compound crosslinking, silane coupling agent modified nanoparticle compound and segmented pre-baking low-temperature curing, wherein the problems of layering demulsification of coating liquid caused by mutual interference of a crosslinking system and a nano modifier are thoroughly solved from a molecular structure to a construction process, stable storage and smooth construction in a low-temperature environment of 0-10 ℃ are realized, the defect of hydrolysis reduction caused by introduction of a conventional antifreezing agent is avoided, the water-based polyurethane coating has the extension functions of antibiosis, ultraviolet resistance, yellowing resistance and the like, the process uses water as a dispersion medium, no VOCs is discharged, the process suitability of large-scale production is ensured, the span-type improvement of the comprehensive performance of the coating is realized, and the technology value and the application prospect are obvious.

Inventors

  • XU XIN
  • GAO YIN
  • ZHOU JINZHU
  • Wan chongqing
  • ZHU YICHENG

Assignees

  • 江苏百瑞特新材料有限公司

Dates

Publication Date
20260508
Application Date
20260226

Claims (10)

  1. 1. The aqueous polyurethane coating for textile fabrics is characterized by comprising the following raw materials, by weight, 60-85 parts of modified aqueous polyurethane emulsion, 1.5-4.0 parts of environment-friendly compound cross-linking agent, 0.5-3.0 parts of nano functional modifier, 0.3-2.0 parts of hand feeling regulator, 0.1-0.8 parts of wetting penetrating agent, 0.05-0.3 parts of defoaming agent, 0.1-0.6 parts of thickening agent, 0.1-0.5 parts of low-temperature stabilizing auxiliary agent, 0.2-0.8 parts of latent curing agent and 10-30 parts of deionized water; The modified waterborne polyurethane emulsion is an anionic emulsion prepared by taking a mixture of polytetramethylene ether glycol and polybutylene adipate glycol as a soft segment, taking a mixture of isophorone diisocyanate and dicyclohexylmethane diisocyanate as a hard segment, adopting a mixture of amino silicone oil and hydroxy acrylic ester to carry out a synergistic end-capping reaction, and simultaneously adopting dimethylolpropionic acid as a hydrophilic chain extender; the nano functional modifier is formed by compounding silane coupling agent modified nano silicon dioxide and nano zinc oxide according to a mass ratio of 2:1-3:1, wherein the particle size of the nano silicon dioxide is 15-30nm, and the particle size of the nano zinc oxide is 20-40nm; the hand feeling regulator is formed by compounding polyether modified polydimethylsiloxane and fatty acid ester slip agent according to the mass ratio of 2:1-4:1; The environment-friendly compound cross-linking agent is a mixture of carbodiimide cross-linking agent and epoxy silane cross-linking agent according to the mass ratio of 1:1-3:2.
  2. 2. The aqueous polyurethane coating of a textile fabric according to claim 1, wherein the mass ratio of the amino silicone oil to the hydroxy acrylate is 1:1 to 2:1, and the hydroxy acrylate is selected from hydroxyethyl acrylate or hydroxypropyl acrylate.
  3. 3. The aqueous polyurethane coating of textile fabric according to claim 1, wherein the polytetramethylene ether glycol and the polybutylene adipate glycol are mixed into soft segments according to a mass ratio of 3:2-5:1, and the isophorone diisocyanate and the dicyclohexylmethane diisocyanate are mixed into hard segments according to a mass ratio of 2:1-4:1.
  4. 4. The aqueous polyurethane coating of textile fabric of claim 1, wherein the silane coupling agent in the nano-functional modifier modifies nano-silica to form covalent bond with the epoxy silane cross-linking agent through surface residual silicon hydroxyl groups.
  5. 5. The aqueous polyurethane coating of textile fabric according to claim 1, wherein the modified aqueous polyurethane emulsion has a solid content of 35% -45% and a particle size of 50-120nm, and the silane coupling agent is 3-aminopropyl triethoxysilane or 3-glycidoxypropyl trimethoxysilane, and the dosage is 5% -10% of the total mass of nano silicon dioxide and nano zinc oxide.
  6. 6. The aqueous polyurethane coating of the textile fabric according to claim 1, wherein the wetting and penetrating agent is nonionic alkyl polyoxyethylene ether and has an HLB value of 12-15.
  7. 7. The aqueous polyurethane coating of textile fabric according to claim 1, wherein the defoamer is a polyether modified silicone defoamer and the thickener is a nonionic hydrophobically modified alkali swelling thickener.
  8. 8. The aqueous polyurethane coating of a textile fabric according to claim 1, wherein the latent curing agent is a blocked isocyanate having a deblocking temperature of 80-100 ℃.
  9. 9. A process for the preparation of an aqueous polyurethane coating for textile fabrics according to any one of claims 1 to 8, characterized in that it comprises the following steps: S1, sequentially adding the wetting penetrating agent, the defoaming agent and the low-temperature stabilizing auxiliary agent into deionized water under stirring, then adding the modified aqueous polyurethane emulsion and uniformly mixing, then adding the nano functional modifier under the shearing and dispersing condition of 500-1000 r/min and continuously dispersing; S2, coating the coating liquid on the surface of a textile substrate, and then sequentially performing low-temperature pre-drying, medium-temperature pre-drying and high-temperature curing, wherein the low-temperature pre-drying temperature is 60-75 ℃, the medium-temperature pre-drying temperature is 80-95 ℃, and the high-temperature curing temperature is 100-110 ℃.
  10. 10. Use of an aqueous polyurethane coating for textile fabrics according to any of claims 1-9, wherein the coating can be applied to textile surfaces by knife coating, roll coating, spray coating or printing, for applications in the fields of clothing, home textiles, outdoor textiles and the like.

Description

Water-based polyurethane coating for textile fabric Technical Field The invention relates to the technical field of textile functional coatings, in particular to a water-based polyurethane coating for textile fabrics. Background The textile coating finishing is a core technology for endowing the fabric with the functions of water resistance, wind resistance, friction resistance, water washing resistance, antibiosis, flame retardance and the like, and the prior art research shows that the Polyurethane (PU) coating has become a main stream material in the field of the current textile coating because of having the flexibility, wear resistance, weather resistance and excellent adhesive force with a fabric substrate. However, the traditional solvent-based polyurethane coating takes an organic solvent as a dispersion medium, releases a large amount of VOCs in the production and use processes, has the defects of poor environmental protection, inflammability, explosiveness, harm to human health and the like, and has difficulty in meeting the development requirements of the current green textile production, while the aqueous polyurethane (WPU) takes water as the dispersion medium, has the remarkable advantages of no toxicity, environmental protection, low odor, easiness in processing and the like, and is widely considered as an ideal substitute material for solvent-based PU. In combination with the technical background and the current research situation, the inventor finds that the prior aqueous polyurethane coating technology still has obvious defects that the prior art is difficult to avoid the problems of coating liquid layering demulsification, coating pinhole peeling after low-temperature construction, performance attenuation after low-temperature solidification, hydrolysis reduction caused by introducing an antifreezing agent and the like caused by the mutual interference of a crosslinking system and a nano modifier, thereby further causing the current situation that the prior aqueous polyurethane coating has insufficient comprehensive performance and limited scene suitability and cannot meet the long-term use requirements in the fields of clothing, home textiles, outdoor textiles and the like. Disclosure of Invention The invention aims to solve the technical problems that the prior art has the defects of single crosslinking, end capping, nano modification, poor performance cooperativity and limited process suitability, and provides a water-based polyurethane coating for textile fabrics. In order to achieve the aim, the aqueous polyurethane coating of the textile fabric adopts the following technical scheme that the aqueous polyurethane coating comprises the following raw materials, by weight, 60-85 parts of modified aqueous polyurethane emulsion, 1.5-4.0 parts of environment-friendly compound cross-linking agent, 0.5-3.0 parts of nano functional modifier, 0.3-2.0 parts of handfeel modifier, 0.1-0.8 parts of wetting penetrating agent, 0.05-0.3 parts of defoamer, 0.1-0.6 parts of thickener, 0.1-0.5 parts of low-temperature stabilizing auxiliary agent, 0.2-0.8 parts of latent curing agent and 10-30 parts of deionized water; The modified aqueous polyurethane emulsion is an anionic emulsion prepared by taking a mixture of polytetramethylene ether glycol and polybutylene adipate glycol as a soft segment, taking a mixture of isophorone diisocyanate and dicyclohexylmethane diisocyanate as a hard segment, adopting a mixture of amino silicone oil and hydroxy acrylic ester to carry out a synergistic end-capping reaction, and simultaneously adopting dimethylolpropionic acid as a hydrophilic chain extender; The nano functional modifier is formed by compounding silane coupling agent modified nano silicon dioxide and nano zinc oxide according to a mass ratio of 2:1-3:1, wherein the particle size of the nano silicon dioxide is 15-30nm, and the particle size of the nano zinc oxide is 20-40nm; the hand feeling regulator is formed by compounding polyether modified polydimethylsiloxane and fatty acid ester slip agent according to the mass ratio of 2:1-4:1; The environment-friendly compound cross-linking agent is a mixture of carbodiimide cross-linking agent and epoxy silane cross-linking agent according to the mass ratio of 1:1-3:2. Preferably, the mass ratio of the amino silicone oil to the hydroxy acrylate is 1:1 to 2:1, and the hydroxy acrylate is selected from hydroxyethyl acrylate or hydroxypropyl acrylate. Preferably, the polytetramethylene ether glycol and the polybutylene adipate glycol are mixed into soft segments according to the mass ratio of 3:2-5:1, and the isophorone diisocyanate and the dicyclohexylmethane diisocyanate are mixed into hard segments according to the mass ratio of 2:1-4:1. Preferably, the silane coupling agent in the nano functional modifier modifies nano silicon dioxide to form covalent bond combination with the epoxy silane crosslinking agent through surface residual silicon hydroxyl. Preferably, t