Preparation method of environmentally-friendly suede leather

Abstract

The invention discloses a preparation method of environment-friendly suede leather, and belongs to the field of leather production. The method comprises the treatment processes of soaking in water, liming, deliming, pickling, tanning, shaving, retanning, neutralizing, dyeing and fat liquoring, and drying and finishing. Epoxy silicone oil, isocyanate crosslinked silane and polyurethane crosslinkedsilica gel are added in the tanning process, and drum tanning is performed; and a chromium retanning agent, epoxy silicone oil, fat liquoring silicone oil and retanning silica gel are added in the retanning treatment process, and mixing retanning is carried out. The epoxy silicone oil, isocyanate crosslinked silane and polyurethane crosslinked silica gel are added in tanning and retanning processes, so that the compatibility of all process additives can be effectively improved, the foaming feeling and the flexibility of leather are enhanced, and the foaming feeling, the filling property, the flexibility, the velvet feeling and the folding resistance of the leather are effectively improved; and the leather has good compatibility, and can directly enters neutralizing, dyeing and fat liquoring processes without water washing, so sewage discharge is reduced, energy conservation and emission reduction are achieved, the process time is shortened by 20%, and the water consumption is reduced by 50-60%.

Description

technical field [0001] The invention relates to the field of leather production, in particular to an environment-friendly suede preparation method. Background technique [0002] Suede is a general term for leather that has been ground to a fine suede, with some or all of the grain on the front nubuck and the suede on the flesh side. Pigskin, cowhide, and sheepskin are mostly made by chrome tanning. Because suede leather is only sanded and dyed without chemical coating, it has excellent air permeability and good softness. The suede products are comfortable to wear and have good hygienic performance, so they are widely used in the production of leather shoes, leather garments, leather bags, gloves, etc. Cowhide is one of the most commonly used leather raw materials in production and life, because its price is relatively cheap, the source is abundant, and the leather products produced from cowhide leather are durable and popular among consumers. Cowhide suede is also a raw ma...

AI Technical Summary

Problems solved by technology

However, in the cowhide treatment process, due to the poor compatibility of the materials between the processes, it is necessary to wash and change the water after each process is completed before entering the next process, that is, it must be washed 4-5 times before the leather embryo can be produced. In the future, the water consumption will increase, the working hours will be prolonged, and the unabsorbed materials in each process, especially the heavy metal trivalent chromium, will also be discharged. The cost of wastewater treatment is greatly increased

[0003] At present, various auxiliaries such as small molecule chromium masking agents such as sodium formate and sodium acetate or macromolecular organic carbon chrome tanning auxiliaries such as aliphatic aldehyde tanning agents and acrolein modified polymer tanning agents have been widely used to promote chromium absorption. Reduce the amount of chromium and chromium emission, but these carbonized chrome tanning auxiliaries can not improve leather properties such as fullness, foaming, filling, suppleness, velvet, and folding resistance