Method for preparing embossable solvent-free synthetic leather

Abstract

The invention discloses a method for preparing embossable solvent-free synthetic leather. The method comprises the following steps: (a) preparing an embossable solvent-free synthetic leather dry-method half-finished product, namely, uncoiling a piece of release paper, coating a surface layer, drying, cooling, coating a thermoplastic foaming middle layer, drying, cooling, coating a thermoplastic foaming adhesive bottom layer, pre-drying, semi-crosslinking, semi-foaming, adhering to a substrate, cross-linking, solidifying, and peeling off the release paper, so as to obtain an embossable solvent-free synthetic leather dry-method finished product; and (b) embossing and performing aftertreatment, namely, uncoiling the embossable solvent-free synthetic leather dry-method finished product, embossing, and performing other aftertreatment, so as to prepare an embossable solvent-free synthetic leather finished product. The made synthetic leather is of a two-layer foaming structure, the upper layer is a relatively thin thermoplastic foaming middle layer which can be softened, cooled and reformed and deforms at certain temperature, so that the synthetic leather has the characteristic of embossability; the lower layer is a relatively thick thermoplastic foaming bottom layer which can show main physical properties and the hand feeling of the synthetic leather. The synthetic leather can be produced by using an ordinary synthetic leather production line.

Description

technical field [0001] The invention belongs to the field of synthetic leather manufacture, and relates to a method for manufacturing PU synthetic leather, and a method for manufacturing embossable solvent-free synthetic leather. Background technique [0002] The traditional synthetic leather production process needs to use a large amount of organic solvents, which will seriously damage the ecological environment. The use of organic solvent-free synthetic leather production processes is conducive to environmental protection. At present, my country's organic-solvent-free synthetic leather technology is in the ascendant. The Chinese invention patent application number 201110254065.5 discloses a method for producing polyurethane synthetic leather by a solvent-free two-component polyurethane scraping method, but this method can only produce lines with release paper. The cross-linked thermosetting solvent-free synthetic leather of the body shape, while the embossed products of the...

AI Technical Summary

Problems solved by technology

At present, my country's organic-solvent-free synthetic leather technology is in the ascendant. The Chinese invention patent application number 201110254065.5 discloses a method for producing polyurethane synthetic leather by a solvent-free two-component polyurethane scraping method, but this method can only produce lines with release paper. Cross-linked, thermoset, solvent-free synthetic leather, while embossed products with a wider market cannot be produced

The Chinese invention patent with the application number 201210084490.9 discloses a solvent-free environmentally friendly synthetic leather produced by water-based polyurethane mechanical foaming technology, which can be embossed, but because the solvent is water with a high latent heat, the drying process is difficult and the energy consumption is serious. Production The efficiency is low and the resistance to hydrolysis and aging is poor. It needs to reinvest in a new water-based production line with a long oven length to produce

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