A kind of leather production process

Abstract

The invention discloses a leather production process and relates to the field of leather. The key points of the technology are: including the sequential immersion, degreasing, softening, tanning, processing and further processing of the raw hide; the tanning agent used in the tanning process includes the following components in parts by weight: 30~40 parts of SPDP; 20~30 parts of auxiliary enzyme preparation 30-40 parts of tanning aids; 10-20 parts of penetration aids; auxiliary enzyme preparations are selected from any one of protease and lipase; tanning aids are selected from any one of amino acids and casein; The agent is any one of fatty alcohol polyoxyethylene ether or alkali-resistant penetration agent OEP-70; SPDP, auxiliary enzyme preparation, tanning auxiliary agent and penetration auxiliary agent are mixed to obtain leather tanning agent, which has the effect of reducing water quality and environmental impact , Avoid the advantages of tannin extract dyeing, hard leather embryo, and long-term storage of mechanical properties.

Description

technical field [0001] The invention relates to the field of leather, more specifically, it relates to a leather production process. Background technique [0002] Leather is denatured and non-perishable animal skin obtained through physical and chemical processing such as depilation and tanning. my country's leather industry has developed for decades, and various kinds of leather emerge in endlessly, but basically all leather needs to go through the "tanning" step. [0003] The "tanning" process is a process in which the tanning agent molecules penetrate into the skin and combine with the active groups of raw hide collagen molecules to change the properties. Tanning makes the cross-linking bonds between the collagen polypeptide chains of the skin increase, which increases the stability of the collagen structure and improves the quality of the skin. Improve the shrinkage temperature and humidity and heat stability, and improve the ability to resist acids, alkalis, enzymes an...

AI Technical Summary

Problems solved by technology

[0007] In the prior art, the leather preparation method similar to the above all can add tanning agents when "tanning" the leather, and most of the existing tanning agents still use chromium-containing tanning agents in the leather production process (as the authorized patent announcement number is CN102517409B A kind of leather retanning method disclosed in the Chinese invention patent; Another example is that the Chinese invention patent of authorized patent announcement number CN103146852B discloses a kind of leather and leather products and its processing method), but the chromium-containing tanning agent can cause leather wastewater The content of heavy metal chromium in the water seriously exceeds the standard, which seriously affects the water quality and the environment.

[0008] Although the existing "tanning" process is also carried out by vegetable tanning methods (such as the invention patent of CN102080134B, such as the invention patent of CN101857907B), the existing vegetable tanning process generally needs to use tannin extract Preparation of tanning agent, although tannin extract itself has a good tanning effect, but the leather embryo tanned by tannin extract often causes many disadvantages such as darker leather color, harder leather embryo, and decline in mechanical properties after long-term storage

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