Method for manufacturing chromium-free tanning environment protection pigskin shoes
A manufacturing method, chrome-free tanning technology, applied in small raw hide/big raw hide/leather/fur treatment, small raw hide/big raw hide/leather skin/fur chemical treatment, pre-tanning chemical treatment, etc., can solve dull color, The human body and the environment are dangerous, the color of tanned colored leather is not bright enough and beautiful, etc., to achieve the effect of good flame retardancy, high corrosion resistance and good natural degradation
Active Publication Date: 2012-07-11
王德振
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Problems solved by technology
But above-mentioned technology still has some defectives, for example: can not carry out biodegradation, pollutes to environment, the whiteness of the white leather that chrome tanning method produces is not enough, and the color is dull and dull, and the color of tanned colored leather is bright and attractive in appearance not enough, traditional chrome tanning method Trivalent chromium will be produced, and trivalent chromium is unstable and can be converted into hexavalent chromium, causing great potential danger to human body and environment
It can be said that the current chrome-free tanning technology is still not mature and perfect, and more advanced technologies are urgently needed to improve product performance and quality.
Method used
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Embodiment 1
[0020] (1) Softening: take the weight of the bare skin after swelling as 100, first degrease the bare skin after depilation, and determine whether it needs to be degreased again according to the oil content of the bare skin during the softening process. The pH value of the softening process is controlled at 7.0-7.5, at this time, the temperature is controlled at 36°C-38°C, the softening time is generally controlled at 6-8 hours, and then the washing step is carried out;
[0021] (2) Pickling: Add 90 parts of normal temperature water and 9 parts of industrial salt, rotate for 5 minutes, soak the bare hide with 1.1 parts of concentrated sulfuric acid and 0.5 parts of formic acid, the pH is 2.6-3.2, and the temperature is controlled at 20 ° C -28 ℃, the time required for operation is 2.5-3 hours;
[0022] (3) Main tanning: in the pickling solution, add a degreasing agent, the amount of which is 1.0 part, adjust the pH value to 3.0, rotate for 30 minutes, then add 0.4 part of baki...
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Abstract
The invention provides a method for manufacturing chrome-free tanning environment-friendly pigskin shoe inner leather. The method adopts an organophosphorus salt chrome-free tanning agent, and during the process of producing environment-friendly chrome-free tanning pigskin, the method comprises the steps as follows: softening, pickling, primary tanning, remoistening, oxidizing, neutralizing, tanning again and removing aldehyde. Pigskin leather produced by the method has white leather which is as white as polished jade and color leather which is brighter and more colorful; finished leather has good flame retardancy, noncorrosibility and very high tensile strength and tearing strength; the finished leather has good natural degradability and does not cause pollution to the environment; and the finished leather and waste material can not produce hexavalent chrome toxicity and the problem of formaldehyde pollution.
Description
【Technical field】 [0001] The invention relates to the field of leather tanning, in particular to an environment-friendly chrome-free tanned pigskin shoe lining. 【Background technique】 [0002] Leather industry is an important traditional light industry in my country, and it is also one of the industries with serious pollution discharge. The traditional chrome tanning method with a history of more than 100 years is still the main tanning process in my country's leather industry. However, with people's awareness of environmental protection and health Gradually increasing, the harm caused by substances such as hexavalent chromium and formaldehyde in the chrome tanning method to the human body and the environment has attracted more and more attention from the society and the public. In recent years, the European Union, one of my country's main trading partners, has successively formulated a number of technical barriers to the content of hexavalent chromium, formaldehyde and total...
Claims
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IPC IPC(8): C14C3/08C14C1/08
Inventor 王德振
Owner 王德振