Water-based dry method foaming raincoat leather and preparation method thereof

Abstract

The invention provides water-based dry method foaming raincoat leather and a preparation method thereof. A water-based thickening agent, a defoaming agent, a flatting agent and other preparations are added into waterborne polyurethane resin, slurry on the surface layer, the middle layer, and the foaming layer and the bottom layer of waterborne polyurethane resin slurry is prepared through mixing and vacuum defoaming; through a dry method film moving processing method, release paper is firstly coated with the surface layer, the surface layer is coated with the middle layer after being dried and cooled, the middle layer is coated with the foaming layer after being dried and cooled, and the foaming layer is coated with the bottom layer after being dried and cooled; after low-temperature drying, base cloth is attached at high temperature, drying, curing and cooling are carried out, the release paper is stripped, split rolling and surface aftertreatment are carried out, and the water-based dry method foaming raincoat is obtained. The obtained water-based dry method foaming raincoat has good washing and water pressure resistance, and the water pressure resistance is still 10,000 MPa or above after washing; the water-based dry method foaming raincoat leather is soft in hand feeling, resistant to wrinkles, high in real leather sense, good in breathability and high in washing and water pressure resistance and completely meets the needs of the market for raincoat leather.

Description

technical field [0001] The invention relates to the technical field of leather, and specifically discloses a water-based dry-process foamed raincoat leather and a preparation method thereof. Background technique [0002] Raincoat leather has a good handle and is widely used in clothing outerwear. With the change of the market and the improvement of consumers' taste, the grade requirements for raincoat leather are getting higher and higher. The quality of traditional raincoat leather can no longer meet the needs of consumers. It is an inevitable direction to develop high-grade raincoat leather. [0003] The raincoat leather circulating on the market includes PVC calendered leather and solvent-based PU dry-laid raincoat leather. The advantages of PVC calendered raincoat leather are low cost, simple production process and thick handle. However, the weather resistance of PVC calendered raincoat leather is poor, and it is cumbersome to wear, and the plasticizer (DOP-dioctyl pht...

AI Technical Summary

Problems solved by technology

However, the weather resistance of PVC calendered raincoat leather is poor, and it is cumbersome to wear, and the plasticizer (DOP-dioctyl phthalate) in PVC calendered raincoat leather will slowly volatilize over time, resulting in poor strength and water pressure resistance. decline, and plasticizers can cause damage to human health

The advantage of solvent-based PU dry-process raincoat leather is that the product provides good feel and elasticity, and the price is cheap, and the cost can be controlled within a very low range; however, the water pressure resistance of solvent-based PU dry-process raincoat leather will change after washing. Very poor, water pressure drops from 15000mpa before washing to 4000mpa, organic solvents left in solvent-based PU dry-process raincoat leather will cause air pollution and damage human health

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