Search

CN-121991318-A - Polyurethane wet hydrolysis-resistant resin for imitation protein shoe lining leather and preparation method thereof

CN121991318ACN 121991318 ACN121991318 ACN 121991318ACN-121991318-A

Abstract

The invention provides polyurethane wet hydrolysis-resistant resin for protein-like shoe lining leather, and a preparation method and application thereof. The raw materials for preparing the polyurethane wet hydrolysis resistant resin comprise, by weight, 0.002-0.004 part of inorganic acid, 164-247 parts of polyol, 45-69 parts of isocyanate, 7-11 parts of small molecular alcohol, 27-41 parts of auxiliary agent and 555-833 parts of solvent. The polyurethane wet hydrolysis resistant resin has the characteristics of hydrolysis resistance for 5 years, thick hand feeling, high myogenic property, good washing performance and the like, and the prepared soft imitation protein shoe lining leather keeps better film forming property and soft imitation protein hand feeling, so that the product is widely applied in soft hydrolysis resistance.

Inventors

  • XIONG ZHIHAI
  • WANG GANG
  • SUN QING
  • ZHAO XUELI
  • WANG QINHONG

Assignees

  • 浙江旭川树脂有限公司

Dates

Publication Date
20260508
Application Date
20260311

Claims (9)

  1. 1. The polyurethane wet hydrolysis-resistant resin for the protein-like shoe lining leather is characterized by comprising the following raw materials in parts by weight: 0.002-0.004 part of inorganic acid; 164-247 parts of polyalcohol; 45-69 parts of isocyanate; 7-11 parts of small molecular alcohol; 27-41 parts of auxiliary agent; Solvent 555-833 parts, wherein the polyol comprises polyether polyol and polyester polyol, the polyether polyol comprises polyether polyol with polytetrahydrofuran structure and polyether polyol with polypropylene oxide structure, the polyether polyol with polypropylene oxide structure comprises polyether polyol with first polypropylene oxide structure and polyether polyol with second polypropylene oxide structure, the molecular weight of which ranges from 1800 to 2200, the molecular weight ranges from 3800 to 4200, and the polyester polyol comprises polyester polyol with adipic acid-1, 4-butanediol-ethylene glycol system and polyether polyol with polytetrahydrofuran structure.
  2. 2. The protein-imitated shoe lining leather polyurethane of claim 1, wherein the inorganic acid is concentrated phosphoric acid.
  3. 3. The protein-imitated shoe lining leather polyurethane according to claim 1, wherein the molecular weight of the polyether polyol with the polytetrahydrofuran structure is 1800-2200, the molecular weight of the polyester polyol with the adipic acid-1, 4-butanediol-ethylene glycol system is 3800-4200, and the molecular weight of the polyether polyol with the polytetrahydrofuran structure is 800-1200.
  4. 4. The protein-imitation shoe lining leather polyurethane of claim 1, wherein the isocyanate is one or more of diphenylmethane diisocyanate, dimethyldiphenylmethane diisocyanate, toluene diisocyanate.
  5. 5. The protein-imitated shoe lining leather polyurethane according to claim 1, wherein the small molecule alcohol is one or more of ethylene glycol, 1, 4-butanediol and diethylene glycol.
  6. 6. The protein-imitated shoe lining leather polyurethane according to claim 1, wherein the solvent is N, N-dimethylformamide, and the auxiliary agent is one or more of a water-aid lotion, a stabilizer, a blocking agent and a hindered phenol antioxidant.
  7. 7. The protein-imitated shoe lining leather polyurethane according to claim 6, wherein the water-aid washing agent is polyether polyol and polysiloxane system softener, the stabilizer is benzoic acid, and the end-capping agent is methanol.
  8. 8. The method for preparing the polyurethane for the protein-imitated shoe lining leather according to any one of claims 1 to 7, comprising the steps of preparing a polyurethane wet hydrolysis-resistant resin intermediate A, a polyurethane wet hydrolysis-resistant resin intermediate B, and finally preparing the polyurethane wet hydrolysis-resistant resin by taking the polyurethane wet hydrolysis-resistant intermediate A accounting for 5% of the total resin and the polyurethane wet hydrolysis-resistant intermediate B accounting for 10% of the total resin as components.
  9. 9. A synthetic leather prepared using the polyurethane for protein-like shoe lining leather of any one of claims 1 to 7 or prepared using the polyurethane for protein-like shoe lining leather of claim 8.

Description

Polyurethane wet hydrolysis-resistant resin for imitation protein shoe lining leather and preparation method thereof Technical Field The invention belongs to the technical field of polyurethane materials, and particularly relates to a polyurethane wet hydrolysis-resistant resin for protein-like shoe lining leather, and a preparation method and application thereof. Background The wet hydrolysis resistant resin for the imitation protein shoe lining leather is characterized in that the prepared hydrolysis resistant resin is coated on a spunlaced fabric, and then enters a series of processes of solidification in water, washing, drying and the like through a scraper with fixed thickness to form a wet bass, and then a layer of dry imitation protein skin feel resin is stuck on the surface of the wet bass to form soft imitation protein hydrolysis resistant synthetic leather with soft feel. At present, the resin for soft imitation protein hydrolysis-resistant wet leather and the resin for soft feeling hydrolysis-resistant wet leather are available on the market. The soft imitation protein hydrolysis-resistant wet leather resin is prepared by adding a large amount of protein powder and polyvinyl alcohol to mix when a formula is applied to achieve better imitation protein skin feel performance, and the synthetic leather is prepared by adopting a wet process of imitation protein shoe lining leather. The soft hydrolysis-resistant wet leather resin is a synthetic leather prepared by a wet process for imitation protein shoe lining leather, which is prepared by using a large amount of organic silicon soft softening agents in a design formula to achieve soft feel, and the wet process has the defects that the base cloth is difficult to permeate and the peel strength is not sticky due to the fact that the base cloth is difficult to permeate by water washing after processing, and the soft imitation protein hydrolysis-resistant leather resin and the soft hydrolysis-resistant leather resin sold in the market cannot achieve both the imitation protein effect and the soft feel performance at the same time, so that the synthetic leather incapable of achieving the imitation protein soft feel effect encounters bottlenecks in the back end application and development of various styles, and the added value of the market products is difficult to improve. Therefore, it is very necessary to develop a polyurethane wet hydrolysis-resistant resin for imitation protein shoe lining leather. The company has filed an invention patent (CN 120737302A) named polyurethane wet resin for soft pressure-resistant pattern clothing leather and a preparation method and application thereof. The raw materials for preparing the polyurethane wet resin comprise, by weight, 0.002-0.004 parts of inorganic acid, 165-251 parts of polyester polyol, 42-64 parts of isocyanate, 7-11 parts of small molecular alcohol, 24-37 parts of auxiliary agent and 560-840 parts of solvent, wherein the polyester polyol comprises polyester polyol of adipic acid-ethylene glycol-1, 4 butanediol system, polyester polyol of adipic acid-phthalic acid-ethylene glycol-1, 4 butanediol system, polyester polyol of adipic acid-diethylene glycol-ethylene glycol system, polyester polyol of adipic acid-diethylene glycol system and polyester polyol of adipic acid-ethylene glycol system. Disclosure of Invention Aiming at the problems that the existing soft-feel hydrolysis-resistant synthetic leather is easy to have bass surface slip and low in thickness, meanwhile, the synthetic leather is insufficient in water washing, so that the product is difficult to detect the peeling strength through a hot-melt adhesive tape, the application range of the rear end through an application product is limited, and the like, the invention aims to provide the polyurethane wet hydrolysis-resistant resin for the imitation protein shoe lining leather, and the preparation method and the application thereof. To achieve the purpose, the invention adopts the following technical scheme: The invention provides a polyurethane wet hydrolysis-resistant resin for protein-like shoe lining leather, which comprises the following raw materials in parts by weight: 0.002-0.004 part of inorganic acid; 164-247 parts of polyalcohol; 45-69 parts of isocyanate; 7-11 parts of small molecular alcohol; 27-41 parts of auxiliary agent; solvent 555-833; Preferably, the inorganic acid is concentrated phosphoric acid. Preferably, the polyols include polyether polyols including polyether polyols of polytetrahydrofuran structure (denoted PE-1) and polyether polyols of polypropylene oxide structure including polyether polyols of first polypropylene oxide structure (denoted PE-2) having a molecular weight in the range of 1800-2200 and polyether polyols of second polypropylene oxide structure (denoted PE-3) having a molecular weight in the range of 3800-4200, and polyether polyols of adipic acid-1, 4-butanediol-ethylene glycol system (denoted PE-4) and po