Collagen fiber regenerated leather surface treatment method

Abstract

The invention related to a collagen fiber regenerated leather surface treatment method. According to the treatment method, a layer of wet-method resin buffering layer is manufactured on the surface of one side of a substrate cloth with a polyurethane wet method; a dry-method resin surface layer is manufactured with a polyurethane dry method; when the resin buffering layer and the resin surface layer on the surface of one side of the substrate cloth are molded, the surface of the other side of the substrate cloth is subjected to a hot lamination adhesion treatment with collagen fiber regenerated leather. Therefore, a composite leather bonding strength reduction phenomenon caused by a sequence that the substrate cloth is first bonded with the collagen fiber regenerated leather and then subjected to polyurethane wet treatment is avoided. Also, according to the treatment method, polyurethane is directly coated on the substrate cloth, and printing and texture rubbing treatments are then carried out, such that a defect of poor imitation performance of surface manufacturing by using a conventional release paper medium on the substrate surface is avoided. Further, with roughening treatment and the like, the composite leather obtained with the method has an effect closer to that of first-layer genuine leather. The product can be used for manufacturing high-end handbags and sofa materials.

Description

technical field [0001] The invention relates to a method for manufacturing nonwoven materials, in particular to a method for treating the surface of collagen fiber regenerated skin. Background technique [0002] The leftovers of natural leather are very large. If they can be reused, especially processed into regenerated leather, considerable wealth will be generated, and at the same time, it will have positive significance for green energy conservation and environmental protection. But like the split skin, the regenerated skin, which is composed of collagen fibers, has poorer appearance properties. Therefore, for example, if regenerated leather is used as a grained composite leather, it is required that a resin layer imitating a grained surface be formed on the surface of the composite leather. [0003] On the one hand, unlike the split skin, since the collagen fiber length of the dermis is shortened after fibrillation, the strength of the collagen fiber regenerated skin is...

AI Technical Summary

Problems solved by technology

However, if direct coating is used and then wet treatment is carried out, the strong polar solvents such as dimethylformamide in the coated polyurethane slurry will dissolve into water during wet treatment. Has a certain solubility, if the product to be wet-processed contains a polymer binder, the wet-process will reduce its bond strength

Therefore, for the composite imitation leather obtained by bonding and compounding, the synthetic resin buffer layer obtained by direct coating of polyurethane and rewetting method is highly simulated, but its bonding strength is damaged.