Nappa type high-grade plane sofa leather and production process thereof

Abstract

The invention discloses nappa type high-grade plane sofa leather and a production process thereof. The technology sequentially comprises the following working procedures of (1) wet blue leather grouping, (2) wringing, splitting, shaving and weighing, (3) softening, (4) neutralization I, (5) retanning and filling I, (6) aluminum retanning, (7) neutralization II, (8) retanning and filling II and dyeing, (9) fat liquoring, (10) drying and finishing and (11) coating, wherein strong alkali and weak acid salt, a neutralizer, a polymer retanning agent and a synthetic ester compound fatliquor are added in the neutralization I and the neutralization II; and a polymer retanning agent, a synthetic tanning agent and a composite resin tanning agent are added in the retanning filling I procedure. According to the application, the nappa type high-grade plane sofa leather prepared by the production process of the nappa type high-grade plane sofa leather has the general characteristics of comfortable hand feeling, uniform and consistent thickness of the whole leather, light resistance, wear resistance, scratch resistance, good physical and mechanical strength and the like; meanwhile, the grain surface is fine, compact and non-loose, the body bone is plump and soft, the surface touch is silky and moist, and the like, and the ecological environmental protection performance is improved.

Description

technical field [0001] The invention relates to the technical fields of tanning chemistry and engineering, in particular to a napa-type high-grade flat sofa leather and a production process thereof. Background technique [0002] Traditional sofa leather is generally dominated by tumbling patterns, including natural tumbling pattern sofa leather, embossed tumbling pattern sofa leather, etc. Dropped sofa leather has been popular for more than 20 years, which has caused consumers' aesthetic fatigue. In recent years, the sales price has been falling all the way, and has dropped to 8-10 yuan per square foot. It is already sold at cost price, and the profit is basically zero. On this basis, flat sofa leather came into being, and all of them are developing in the direction of "softness, fullness and firmness", that is, napa-type leather. [0003] Compared with the traditional shattered sofa leather, Napa flat sofa leather not only has the general characteristics of comfortable han...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present application provides a kind of napa type high-grade flat sofa leather and its production process, which solves the problems of poor compactness, high loose surface rate and not falling resistance, which exist in the production and processing of flat sofa leather in the prior art. The problem of not being stretch-resistant; the obtained Napa type high-grade flat sofa leather not only has the general characteristics of comfortable hand feeling, uniform thickness of the whole leather, light-resistant and abrasion-resistant coating, good physical and mechanical strength, but also has a grain surface. Fine and firm surface, full body and soft foam, silky and moist surface, etc. Excellent performance, and the process does not use chromium powder and chromium-containing materials in the implementation process, which effectively reduces environmental pollution and improves ecological environmental protection performance