Method for tanning cattle hide upper leather using non-chromium metal composite tanning agent

Abstract

The invention relates to a method of tanning cattle shoe upper leather with non-chrome metal compound tanning agent, comprising steps of pre-treatment, tanning and after-treatment. LTA-100 metal (chrome-free) compound tanning agent, chrome-free tanning partner D5, tanning assisting agent GM-15 and the like are adopted during the process of tanning. The invention is characterized in that: the shrinkage temperature of leather in the industrialized production can be stabilized above 85 DEG C, even above 90 DEG C; chrome pollution and phosphorus pollution are not produced, and formaldehyde is not released; the dyeing color is so rich that the color is better for white rather than that of the chrome tanning leather; the tannery sludge can be directly burned without causing potential danger of hexavalent chrome. The invention can be sued for substituting the traditional technique of leather tanning by chrome powder, meanwhile eliminating pollution to humankind and environment by chromium salts during the process and in the wastes of leather products. The productobtained by the method has good strength, thus blazing a trail in producing chrome-free tanning cattle shoe upper leather for tanneries.

Description

technical field [0001] The invention belongs to the field of leather tanning, and in particular relates to a chrome-free tanning technology of yellow cow shoe upper leather. Background technique [0002] Chrome tanning, which has a history of more than 100 years, has been the mainstream technology of leather tanning because it can impart excellent performance to leather, and it is almost unshakable. Chromium pollution in the tanning industry has three sources: first, pollution in the production and processing of chromium-containing materials; second, pollution in sewage, sludge, and chromium-containing solid waste in the tanning production process; Third, secondary pollution to the environment after consumption of chromium-containing products. This pollution is often ignored by people, but it accounts for about 70% of the total chromium pollution in the whole leather industry, and it is quite scattered, which is not conducive to treatment or recovery. With the development ...

AI Technical Summary

Problems solved by technology

These three technologies have one or more of the following problems in the actual industrial production engineering: the shrinkage temperature of leather cannot be stabilized above 85°C; the performance of leather is far behind that of chrome-tanned leather; Some leather processing technology systems; the elimination of chromium pollution brings pollution problems such as organic phosphorus and formaldehyde

[0004] In addition, the common chrome-free tanned leather often has insufficient whiteness when producing shoe upper leather products; or it is not resistant to yellowing; the shrinkage temperature is not high, which is not conducive to subsequent processing and shoemaking processing.