Production process of non-heavy metal tanned cow leather

Abstract

The invention discloses a production process of non-heavy metal tanned cow leather. The production process comprises the following working procedures of taking grey bare leather, weighing (1), pre-deliming, main deliming, softening, washing, main tanning, collaborative tanning, standing, shaving, weighing (2), treatment (1) and vibration staking (1). The treatment (1) comprises softening (1), neutralizing (1), washing (1), filling (1), fat liquoring (1), standing (1) and drying (1). A degreasing agent, a deliming agent and a complexing agent are adopted in the pre-deliming and main deliming processes; an amphoteric organic compound is adopted in the main tanning process; a phenolic synthetic tanning agent is adopted in the collaborative tanning process; an amphoteric sulfo fatting agent is adopted in the step of neutralizing (1); a sulfone synthetic tanning agent is adopted in the step of filling (1); a cationic fat liquoring agent is adopted in the fat liquoring step (1); the degreasing agent is a nonionic surfactant; the deliming agent is a mixture of ammonium salt and organic acid; and the complexing agent is a polyphosphate complex.

Description

technical field [0001] The invention relates to the technical field of tanning, in particular to a production process for tanning bovine leather without heavy metals. Background technique [0002] Chrome tanned leather has excellent moisture and heat resistance stability, resilience, fullness, mechanical strength, etc., making chrome tanning still the most widely used tanning method in the leather industry. However, with the continuous improvement of the degree of industrialization and the increasing awareness of environmental protection of consumers, the shortage of chromium resources, the safety of chrome tanned leather products and the treatment of chromium-containing waste (waste water, waste leather scraps, etc.) have attracted increasing attention. EU countries even put forward "chrome-free" requirements for some imported leather and leather products, which restricts the export of my country's leather and leather products. [0003] Chromium is a heavy metal element wi...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present application provides a production process for tanning cow leather without heavy metals, uses amphoteric organic compounds and phenolic syntans instead of chrome tanning agents, controls from the source, and solves the problem of heavy metal elements such as chromium in the existing tanning technology. The adverse effects caused by human health and the ecological environment have achieved a kind of heavy metal-free ecological cow leather, which does not contain heavy metal elements such as trivalent chromium and hexavalent chromium that cause harm to the human body and pollute the environment, and free formaldehyde content Conforms to the European Union's limit standard for formaldehyde in leather that comes into direct contact with the skin

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