Tanning method of Tan sheep fur

Abstract

The invention relates to the fur tanning field and in particular relates to a tanning method of Tan sheep fur. The tanning method sequentially comprises the following steps: a tanning step, an alkaline-extracting step, a wet-milling step, a washing step, a re-tanning step and a fixing step, wherein in the tanning step, the Tan sheep fur, which is softened after being soaked in acid, is placed in tanning liquor with temperature of 25 DEG C-35 DEG C and the pH value of 3.0-3.5 for tanning until the color of the Tan sheep fur cut is checked to be orange yellow by a methyl orange indicator, so that the tanned Tan sheep fur is obtained, wherein the mass ratio of the tanning liquor to the Tan sheep fur, which is softened after being soaked in acid is (20-40):1; and the tanning liquor includes sodium chloride, organic acid, EDTA (Ethylene Diamine Tetraacetic Acid), a chrome-free tanning agent DTFUR 5Q802, a whitening agent Kabainy D and water in a mass ratio of (60-80):(1.5-2.5):(0.5-1.5):(5-8):(0.1-1.5):1000. The tanning method of the Tan sheep fur disclosed by the invention is pollution-free to the environment; and the physical and mechanical performances of the produced Tan sheep fur can completely achieve those of the Tan sheep fur which is obtained by a common chrome tanning method.

Description

technical field [0001] The invention relates to the field of fur tanning, in particular to a method for tanning sheepskin. Background technique [0002] Since its inception, chrome tanning has always occupied a dominant position in the tanning process of fur and leather. Chrome tanned fur or leather is resistant to heat and humidity, soft and plump, and has good stability; especially the shrinkage temperature can reach above 100°C, and the dyeing effect is excellent. Therefore, chrome tanning has always been used as the main tanning method for fur and leather. In the related art, the tanning of fur and leather includes the following steps: 1) pre-soaking step; 2) de-fleshing step; 3) water-bath degreasing step; 4) re-soaking step; 5) pickling softening step; 6) tanning step; 7 ) Step of alkali extraction; 8) Wet grinding step; 9) Washing step; 10) Retanning step; 11) Fixing step; 12) Neutralization step; 13) Fatliquoring step; 14) Drying step; 15) Rewetting step ; 16) step...

AI Technical Summary

Problems solved by technology

Because during the tanning step, alkali extraction step, retanning step and fixing step, the Cr 3+ Complexes, some Cr 3+ After undergoing tanning, alkali extraction, retanning and fixation, it is transformed into Cr with carcinogenic properties. 6+ , so that it contains Cr 6+ It is very difficult to treat the sewage and cause serious environmental pollution.

In addition, because chrome-tanned fur is prone to produce a large amount of free formaldehyde during later dyeing or special effect treatment, it is extremely harmful to human health