A kind of method utilizing aqueous polyurethane to prepare wet process bass

Abstract

The invention provides a method of preparing a wet base through aqueous polyurethane. The method comprises the following steps of: (1) coating aqueous polyurethane resin slurry on base cloth; (2) soaking the base cloth soaked with the aqueous polyurethane resin slurry in the step (1) in an aqueous solution containing a flocculant to pre-solidify so as to prepare a pre-solidified base precursor; (3) washing and heat curing the pre-solidified base precursor prepared in the step (2) in hot water; and (4) heat setting the heat-cured base prepared in the step (3) through water vapor, and then, ironing and drying the base to obtain the aqueous wet base. The method provided by the invention belongs to manufacturing methods of ecological synthetic leather, thereby being safe and environmentally-friendly, and the wet base prepared by the method is strong in skin feeling, thereby being capable of being used as high-grade synthetic leather.

Description

technical field [0001] The invention belongs to the field of synthetic leather in the plastic industry, and in particular relates to a method for preparing wet-laid bass from water-based polyurethane. Background technique [0002] The synthetic leather industry was introduced from abroad in the 1980s and developed rapidly. After decades of development, my country's synthetic leather industry has grown from scratch to today's big production and consumption country, and has continuously achieved leapfrogging. However, traditional synthetic leather is generally processed and manufactured with oily polyurethane resin, and the huge production capacity has caused huge environmental pollution and energy loss in synthetic leather manufacturing areas. In addition, the use of oily polyurethane resin to prepare synthetic leather is also prone to fire and other safety accidents, resulting in a sharp increase in safety management costs. Therefore, some domestic synthetic leather manufa...

AI Technical Summary

Problems solved by technology

[0005] Therefore, although water-based leather made by dry process has appeared on the market in recent years, for example, No. 201020280374.0 Chinese patent discloses a dry process production line for water-based ecological synthetic leather, but the water-based leather prepared by dry process is affected by fullness. Due to the limitations of factors such as , peeling strength and difficulty in controlling the cell structure, the water-based bass produced by the dry process has a weak skin feel, and it is difficult to improve the internal quality of the product, so it cannot meet consumers' increasing requirements for leather products.