Preparation method of highly elastic water-based polyurethane synthetic leather

Abstract

The invention relates to the technical field of polyurethane synthetic leather preparation, in particular to a preparation method of highly elastic water-based polyurethane synthetic leather. The method comprises the steps of taking polybutylene glyool adipate and polypropylene oxide glycol as raw materials, adding additives such as stannous octoate, rosin and maleic anhydride, taking fir wood asa raw material, mixing and extruding water-based polyurethane slurry, talcum powder and linear polyethene masterbatch in an extruder, coating nonwoven base cloth with an extruded material, performingdrying to form a water-based polyurethane synthetic leather base, and treating the water-based polyurethane synthetic leather base to form the water-based polyurethane synthetic leather. According tothe method, a carbonized wood fiber has a strong thickening effect and can improve viscoelasticity of the polyurethane slurry; polyurethane molecules are absorbed and stacked on the surface of fumed silica in a formation process of the polyurethane slurry, so that the crystallinity of the water-based polyurethane synthetic leather is reduced; the maleic rosin reacts with glycerol, so that polyurethane keeps better resilience; and the method has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of polyurethane synthetic leather preparation, in particular to a preparation method of highly elastic water-based polyurethane synthetic leather. Background technique [0002] With the continuous development of the economy, people's living standards and consumption levels are increasing day by day, and people have higher and higher requirements for the quality and functions of the products used in life. Although leather products have the advantages of comfortable hand feeling, good elasticity, strong sensuality, and good durability. However, due to the limited natural leather resources, it is far from meeting people's consumption needs, so polyurethane synthetic leather has emerged as the times require. [0003] Polyurethane synthetic leather belongs to the category of polyurethane elastomers. It has the characteristics of soft luster, soft touch, strong leather feeling, excellent adhesion to the substrat...

AI Technical Summary

Problems solved by technology

[0008] The technical problem mainly solved by the present invention is that during the drying and aging process of the current water-based polyurethane synthetic leather, the liquid water is heated and evaporated into gaseous water, and on the other hand, the liquid water-based polyurethane emulsion is heated and becomes solid and adheres to the release film. , in the heated state, the surface of water-based polyurethane absorbs a large amount of heat, so the surface of the film is dried first, and the water-based polyurethane in contact with the release film contains a large amount of water. Since water cannot dissolve the surface polyurethane that has been dried, after absorbing heat , water can only evaporate towards the direction of the release paper, so that the water-based polyurethane film is forcibly separated from the release film, resulting in the decline of the flatness of the water-based polyurethane synthetic leather and the defects of poor resilience. A preparation method for high-elasticity water-based polyurethane synthetic leather is provided.

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