Production method of protein synthetic leather based on salt coagulation and solidification

Abstract

The invention provides a production method of protein synthetic leather based on salt coagulation and solidification. The production method comprises the following steps that (1) an impregnating liquid is prepared, 60-85 parts of water soluble protein and 15-40 parts of anionic stuffing agent by mass are added into a stirring kettle for uniform mixing; (2) a coagulating liquid is prepared, 20-30 parts of coagulation agent, 1-3 parts of cross-linking agent, 3-8 parts of formic acid and 50-66 parts of water by mass are added into the stirring kettle for stirring and mixing; (3) a protein / nonwoven cloth complex is prepared; nonwoven cloth passes through an impregnating groove containing the impregnating liquid; the nonwoven cloth with the impregnating liquid passes through a coagulating groove with the coagulating liquid; and the post-treatment is conducted. According to the production method, a solvent DMF (dimethyl formamide) is not required in the whole production process; a production working environment is safe; the environmental pollution is not caused; and the produced protein synthetic leather has good physical and mechanical properties, breathability, moisture permeability, moisture absorption and removal properties and dyeing property.

Description

technical field [0001] The invention belongs to the technical field of synthetic leather, and in particular relates to a method for producing protein synthetic leather based on salt coagulation and solidification. 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 non-woven fabric is used to simulate the mesh layer, and microporous polyurethane coating is used to simulate the grain layer. The front and back of the obtained synthetic leather are very similar to leather, and have a certain degree of air permeability, which is closer to natural leather than ordinary artificial leather. Widely used in making shoes, boots, bags and ball games. [0003] According to the data of the National Bureau of Statistics, in 2011, there were 495 artificial leather and synthetic leather enterprises above designated size (new classification standar...

AI Technical Summary

Problems solved by technology

DMF (dimethylformamide) is used as solvent in this process, which will cause solvent pollution of DMF during processing

Second, water cannot completely replace the DMF in polyurethane, which will cause the problem of DMF residue in the product, and eventually cause product safety problems

And this kind of product safety problem will restrict products from entering the high-end market amidst numerous technical barriers and trade barriers.

Third, there are very few active groups on solvent-based polyurethane, which makes it difficult for most dyes to be dyed, and its washing fastness is very poor

Fourth, there are very few hydrophilic groups on the solvent-based polyurethane, which leads to poor water vapor permeability and poor moisture absorption and drainage of solvent-based polyurethane synthetic leather, that is, poor hygienic performance.