Solvent-free synthetic leather and manufacturing method thereof

Abstract

The invention discloses solvent-free synthetic leather and a manufacturing method thereof. The method is characterized by comprising the following steps: firstly, directly coating pretreated base cloth with mixed slurry prepared from solvent-free polyurethane, an assistant and a solvent-free cross-linking agent; solidifying the base cloth coated with mixed slurry through an oven to prepare a semi-finished product; coating release paper with water-based polyurethane as surface resin, and drying and transferring the release paper to the semi-finished product; and carrying out water-based surface treatment to obtain environment-friendly solvent-free synthetic leather. The polyurethane free of a solvent directly coats the base cloth, and is solidified and cross-linked to manufacture the synthetic leather. The technology is small in damage to the release paper, non-toxic, free of pollution, low in energy consumption, low in cost and high in efficiency; traditional solvent-type polyurethane is comprehensively replaced with the solvent-free polyurethane and the water-based polyurethane in combination; the variety, the style and the bandwagon effect of a product are diverse; meanwhile, pollution of an organic solvent is eliminated from the source; the product does not contain VOC; and the ecological grade, the finished product level and the international market competitiveness of the synthetic leather are improved.

Description

technical field [0001] The invention belongs to the field of synthetic leather manufacturing, and in particular relates to a solvent-free synthetic leather and a manufacturing method thereof. Background technique [0002] my country is the largest producer and consumer of synthetic leather in the world. At present, there are more than 1,100 artificial leather and synthetic leather enterprises in the country, more than 470 enterprises above designated size, and nearly 2,000 production lines. It is one of the pillar industries of my country's light industry. In 2014, the output of artificial leather and synthetic leather of enterprises above designated size was 3.78 million tons, equivalent to 6.8 billion m 2 . Artificial leather synthetic leather has become an important industry in some local industries. The geographical distribution of my country's artificial leather and synthetic leather industry is mainly concentrated in the Yangtze River Delta and Pearl River Delta and...

AI Technical Summary

Problems solved by technology

[0007] In the above methods, materials A and B are directly coated on the release paper. When materials A and B react on the release paper to form a macromolecular coating or adhesive layer, their active groups will also interact with the release paper. Active groups react to form a strong bond (release paper will produce active groups when oxidized at high temperature), one affects the peeling of paper leather, and the other seriously affects the service life of release paper (release paper is a synthetic leather manufacturing process. The most expensive auxiliary material in the world, the price is 50-60 yuan / square meter, and the service life is less than 50 times); in addition, the synthetic leather prepared by the above method is only a semi-finished product (referred to as Base, Chinese Bass), lacking changing surface layers and surfaces The treatment layer cannot realize the diversification of color, quality and trend effect (such as oil wax discoloration effect, polishing effect, enhancement, matting effect, crazy horse effect, etc.)

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