An environmentally friendly wet dyeing and finishing process for preparing original thick high-grade soft sofa leather

Abstract

The invention discloses an environment-friendly wet-state dyeing and finishing process for preparing raw thick high-grade soft sofa leather, which comprises the following steps in sequence: batching of raw thick wet blue leather→squeezing, smoothing, weighing→rinsing→enzymatic softening①→ Water washing→chrome-free retanning→neutralization→enzyme softening②→water washing→dyeing→fatliquoring→water washing→finishing; this application uses aldehyde tanning agent, cationic polymer tanning agent and amphoteric polymer tanning agent for chrome-free retanning , Using acid protease and ammonia-free softening enzyme for secondary softening treatment, and reasonable matching design of neutralization and fatliquoring process, so that the prepared original thick type high-grade soft sofa leather is soft, plump and elastic, and the whole body is uniform and smooth Full of cotton foam, good softness, all physical and mechanical properties, physical and chemical properties and sensory properties meet the standard of sofa leather, and has good follow-up processing performance; and the process does not use chrome tanning agent, ammonium bicarbonate And other materials, and save the conventional filling process, can greatly reduce pollution.

Description

Technical field [0001] The invention relates to the technical field of leather chemistry and leather engineering, in particular to an environment-friendly wet dyeing and finishing process for preparing original thick high-grade soft sofa leather. technical background [0002] Thick sofa leather has always been a very popular leather product in the market, but with the rapid development of social economy and the increasing improvement of people's living standards, consumers have higher and higher requirements for the properties of thick sofa leather, including environmental protection, softness and so on. Conventional preparation technology of thick sofa leather often requires retanning with chrome tanning agent. Chromium-containing wastewater and sludge produced by chrome retanning are difficult to treat, which will cause serious pollution when discharged into the environment, and hexavalent chromium has strong carcinogenicity, which will pose a significant threat to consumers' h...

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present application provides an environment-friendly wet dyeing and finishing process for preparing the original thick type high-grade soft sofa leather, by using aldehyde tanning agent, cationic polymer tanning agent and amphoteric polymer tanning agent for chrome-free retanning, using secondary Enzyme softening treatment, and the reasonable matching design of the neutralization and fatliquoring process, make the prepared original thick type high-grade soft sofa leather body bone soft, plump and elastic, the whole body is uniform and rich in cotton foam, and the softness performance is excellent, which solves the original problem Thick sofa leather has problems such as reduced softness and uneven distribution of the whole body caused by poor parts and large thickness. The process does not use chemical materials such as chrome tanning agent and ammonium bicarbonate that pollute the environment. And the conventional filling process is omitted, which can greatly reduce the pollution of chromium, ammonia nitrogen, COD, etc., and reduce the difficulty of pollution control