Fur chromium-free and aldehyde-free tanning process

Abstract

The invention discloses a fur chromium-free and aldehyde-free tanning process. The process includes the steps of pre-soaking, primary soaking, fleshing, degreasing, washing, enzyme bating and tanning. The degreasing process includes the steps that 0.8-1.2 g / L of a penetrating agent, 0.5-1 g / L of sodium carbonate, 1.5-2.5 g / L of an anion degreasing agent, 0.2-0.7 g / L of an enzymatic soaking agent 100-c, 0.2-0.7 g / L of lipase and 0.5-1 g / L of neutral enzyme FN are added; Ph is 6.5-7.5, the water temperature is 38-40 DEG C, and reaction time is 2-4 h; and after degreasing is completed, dehydration and cleaning are performed, and the tanning process is executed. The tanning process includes the steps that 1.5-2.5 g / L of Bascal S, 1.5-2.5 g / L of fatty aldehyde and 8-12 g / L of an aluminum tanning agent are added, and the water temperature is 38-40 DEG C; and after reaction is carried out for 1.5-2.5 hours, the PH value is 3-3.5, and 10-15 g / L of chromium powder is added at twice. The adjustment solution pH does not need to be adjusted by adding acid as for the Ph in the degreasing procedure, neutral salt and acid are avoided, tanned fur and fleece are loose and flexible, and a fur plate is plump, flexible and elastic. All the indexes can meet the industrial standard requirement. In addition, the pickling procedure is omitted, namely the neutral salt and acid are avoided, and pollutant emission is reduced.

Description

technical field [0001] The invention relates to the field of fur treatment, in particular to a chrome-free and formaldehyde-free tanning process for fur. Background technique [0002] The specific process of the traditional fur tanning method is as follows: pre-soaking → main soaking → flesh removal → degreasing → washing → enzyme softening → pickling → tanning, there are the following main problems: 1) There are at least 8 processes, and the process is cumbersome; The cycle is about 4 days, and the production cycle is long; it accounts for a large amount of working capital. 2) The consumption of chemical materials is large, the cost is high, and the processing wastewater causes great environmental pollution. ①In order to ensure that the skin of fur products is soft, full, extensible, high in cutting rate, and does not shed hair, acid enzymes are used in the process to soften the skin and pickling process is needed to loosen the collagen fibers of the skin. ②Acid enzyme so...

AI Technical Summary

Problems solved by technology

[0002] The specific process of the traditional fur tanning method is as follows: pre-soaking → main soaking → flesh removal → degreasing → washing → enzyme softening → pickling → tanning, there are the following main problems: 1) There are at least 8 processes, and the process is cumbersome; The cycle is about 4 days, and the production cycle is long; it accounts for a large amount of working capital

2) The consumption of chemical materials is large, the cost is high, and the processing wastewater causes great environmental pollution

③In acid enzyme softening, high concentration of industrial salt may inhibit the activity of enzyme preparation, so the amount of enzyme preparation will be increased, and the softening and pickling time will be prolonged

④ A large amount of industrial salt reduces the absorption rate and tanning effect of the chrome tanning agent, which leads to an increase in the amount of chrome tanning agent, and at the same time increases the chromium content and neutral salt content in the wastewater, which increases the cost and environmental pollution

4) The fur and quilt are not loose enough, flexible enough, and not clean enough

Because the fur is softened by acid enzymes and pickled, a large amount of fat and fibrous matrix protein enter the waste liquid. Since the skin board is in acidic conditions, it cannot be washed with clean water (washing the skin board with clean water will cause serious acid swelling), and it is not easy to remove it in time. Fat, fibrous matrix protein degradation products entering the wastewater, so the tanned fur cover is not loose and flexible enough, and not clean enough

If you want to wash after acid enzyme softening and pickling, you must add more than 60g / L of industrial salt to the clean water to inhibit the acid expansion of the skin, which in turn increases the consumption of industrial salt and environmental pollution.