Method for tanning ecological automobile leather in unsalted no-pickling manner

Abstract

The invention relates to a cow leather manufacturing method and particularly relates to a method for tanning ecological automobile leather in an unsalted no-pickling manner. The method comprises the following processes: (1) a process before tanning; (2) a tanning-combined process; (3) a dry finishing section process; and (4) a coating section process. The tanning-combined process mainly comprises the following steps of: (1) replenishing water; (2) tanning; (3) de-drumming; (4) wringing and shaving; (5) rinsing; (6) carrying out ammonium-free neutralization; (7) dyeing; (8) stuffing; (9) fixing; (10) stacking; and (11) washing with water, wherein a tanning agent adopted during tanning is a non-metallic organic mixed tanning agent, the tanning temperature is controlled to be above 80 DEG C, and the tanning time is 5-10 hours. The method has the advantages that any pickling process is not required, the isoelectric point of the ecological automobile leather is changed, the tanning agent is prompted to penetrate into the leather and be fixed in the leather, the production stability is good, the control is easy, any alkali extraction or oxidation is not required, the processes are simple and easy, and the natural ecological environment can not be destroyed, thereby thoroughly solving the environmental problems caused by neutral salt pollution and pickling.

Description

technical field [0001] The invention relates to a method for making cow leather, in particular to a method for tanning ecological automobile leather without salt or pickling. Background technique [0002] The current leather production process is: soaking→liming→deliming without ammonia→pickling→pre-tanning with organic tanning agent→shaving of wet white skin→organic combined tanning→filling→dyeing→fatliquoring→squeezing and stretching→grinding → Breaking soft → Finishing → Finished product. The salt-free pickling technology that is concerned at home and abroad mainly uses organic acids that can inhibit the swelling of bare skins instead of sulfuric acid-sodium chloride to complete the pickling operation, thereby reducing neutral salt pollution. [0003] However, studies have shown that pickling and alkali extraction in the tanning process only change the pH value of the medium and hides to facilitate the penetration and fixation of the tanning agent. Although the salt-free...

AI Technical Summary

Problems solved by technology

[0003] However, studies have shown that pickling and alkali extraction in the tanning process only change the pH value of the medium and hides to facilitate the penetration and fixation of the tanning agent. Although the salt-free pickling technology has many advantages, this method will affect the quality of the product. At the same time, it will create a certain degree of environmental problems, such as the pollution of trivalent chromium in wastewater and leather products, and the pollution of hexavalent chromium on humans and the environment

Images