Method for producing aqueous polyurethane synthetic leather for costume by using physically-foamed pore forming coating technology

Abstract

The invention relates to a method for producing aqueous polyurethane synthetic leather for costume by using a physically-foamed pore forming coating technology. According to the present invention, a physically-foamed polyurethane coating dry film transferring process replaces the original solvent-based polyurethane wet coagulation coating process, such that the problems of pollution and residue of the DMF solvent are solved; with adopting the aqueous polyurethane dry film transferring process to replace the solvent-based polyurethane dry film transferring process, the solvent pollution problem during the production process is eliminated; the synthetic leather for the costume is washed in hot water, the pore forming agent is lixiviated by the hot water, such that the penetrating pores are formed in the aqueous polyurethane coating of the synthetic leather, the water vapor permeability and the air permeability of the synthetic leather for the costume are improved, and the synthetic leather with the good-sanitary property is obtained; with the method, the DMF solvent recovery apparatus and the DMF solvent recovery process are saved, the production cost is reduced, and the technical process is simplified; when the conventional physical properties and the conventional mechanical properties are met, the water vapor permeability of the synthetic leather for the costume is more than or equal to 1.6 mg / cm<2>.h, and the air permeability of the synthetic leather for the costume is more than or equal to 2500 ml / cm<2>.h.

Description

Technical field

[0001] The invention relates to a production process of synthetic leather, in particular to a method for producing water-based polyurethane synthetic leather for clothing by using physical foaming pore-forming coating technology. Background technique

[0002] Synthetic leather is a composite material that simulates the structure and performance of natural leather and can be used as a substitute for natural leather. Usually the non-woven fabric impregnated with high molecular polymer is used as the simulated mesh layer, and the microporous polyurethane layer is used to simulate the grain surface layer. The front and back sides of the obtained synthetic leather are very similar to leather, and have certain air permeability. Artificial leather is closer to natural leather. It is widely used in making shoes, boots, bags and balls. According to the output statistics of 316 artificial leather and synthetic leather enterprises above the designated size by the National ...