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Non-pickling tanning method for production of bovine leather

A technology of tanning and pickling, applied in small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, chemical treatment before tanning, etc. effect of action time

Inactive Publication Date: 2016-03-23
CHINA LEATHER & FOOTWEAR IND RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is to provide a clean and simple non-pickling chrome tanning method for tanning in view of the deficiencies of the existing pickling and tanning techniques in the production process of tanning. application, as well as the corresponding adjustment and balance of process technology, to realize a method of tanning without pickling in tanning, thereby effectively avoiding the discharge of salt in tanning and tanning wastewater, reducing the discharge of chromium in tanning wastewater, and at the same time The discharge of waste water and other pollutants can also be effectively reduced, and the product quality of finished leather can be improved to a certain extent.

Method used

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  • Non-pickling tanning method for production of bovine leather

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Effect test

Embodiment 1

[0029] Embodiment 1: Tanning process of cow head layer

[0030] 1. Deliming and softening: According to the characteristics of the product, low-temperature softening enzyme is used for softening treatment. Rotation) time is 60 to 90 minutes (20 to 60 minutes longer than the softening time of conventional low temperature softening enzymes). Requirements: The temperature is normal temperature, the deashing should be thoroughly, and the pH value of the bath liquid should be measured at 8.0 to 8.5. The rotating speed of the drum is the same as the existing technological requirements.

[0031] 2. Non-pickled chrome tanning:

[0032] Add 30% of normal temperature water (about 25°C) to the tanning drum, and then proceed in sequence:

[0033] Add pickling oil 0.3~0.5% and rotate for 20min

[0034] Add SF-12.5~3.5% and rotate for 60min

[0035] Add SF-12.5~3.5% and rotate for 120min

[0036] The incision inspection requires full penetration, and the pH value of the bath solution ...

Embodiment 2

[0041] Embodiment 2: cattle two-layer tanning process

[0042] 1. Deliming and softening: According to the characteristics of the product, softening treatment is carried out by using low temperature softening enzyme. The dosage of softening enzyme is 0.6-1.2% of the tare weight (increased by 0-0.5% compared with the conventional dosage), and the dosage of the degreasing agent is the tare weight. 0.3 ~ 0.8% (conventional cowhide processing degreasing operation is carried out in the stage of soaking, liming or retanning, while the non-pickling chrome tanning technology is used for tanning cattle two-layer leather, because the two-layer leather contains high oil and fat, In order to avoid the presence of oils and fats at high pH, ​​an additional step is added to produce chrome soap after adding the unpickled chrome tanning agent). The rotation time of the softening drum is 60 to 90 minutes (30 to 60 minutes longer than the conventional time). Requirements: The temperature is nor...

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Abstract

The invention discloses a method for tanning leather without pickling. The method is characterized by comprising the following steps (A) deliming: deliming limed hide-cut naked hide in the presence of an ammonium-free deliming agent, wherein the using amount of the ammonium-free deliming agent is 0.8-3 percent of the hide weight; (B) softening: softening in the presence of a softening enzyme, wherein the using amount of the softening enzyme is 0.3-1.5 percent of the hide weight; (C) chrome tanning: performing chrome tanning treatment on the softened naked hide in the presence of a non-prickled chrome tanning agent, wherein the pH value at the initial stage of tanning treatment is 6.5-8.5, the liquid ratio at the initial stage of tanning treatment is 30-50%, and the non-prickled chrome tanning agent is an anionic chrome tanning agent; and (D) finishing: performing post-finishing on tanned blue wet leather to obtain finished leather. By applying the non-pickling chrome tanning method, the emission of salt in leather making, pickling and chrome tanning waste water is avoided effectively, the emission of chrome in the tanning waste water is reduced, and the product quality of the finished leather is enhanced at a certain degree.

Description

technical field [0001] The invention relates to a method for chrome tanning cowhide without pickling, which belongs to the technical field of cleaning leather manufacturing and is a main process in the production and processing of cowhide. Background technique [0002] The traditional tanning production process uses water as a medium to process raw hides into finished leather through chemical, physical and mechanical action. [0003] Chemical treatments in leather production are carried out over a wide pH range, such as: soaking, dehairing, liming, deliming, softening, pickling, tanning, retanning, neutralization, dyeing, fatliquoring, acid Fixing, etc., repeated liming - deliming; acid leaching - alkali extraction; neutralization - acidification and other processing processes, the repeated action of acid, alkali and salt makes the content of salt in tannery wastewater very high. At the same time, repeated effects of acid, alkali and salt also damage the cortex to varying d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C1/08C14C3/02
Inventor 高忠柏徐新鉴顾春华罗建华
Owner CHINA LEATHER & FOOTWEAR IND RES INST
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