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A non-pickling chrome tanning agent

A technology of acid chrome tanning agent and sulfuric acid, which is applied in the field of leather chemical material preparation to achieve the effects of wide sources, good tanning effect and wide application range

Active Publication Date: 2021-10-22
GUANGDONG SHENGFANG CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a new non-pickling chrome tanning agent for the problems existing in the existing non-pickling chrome tanning agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] After dissolving a certain amount of potassium dichromate in water, add sulfuric acid so that the ratio of the amount of chromium trioxide and sulfuric acid in the solution is 1:2.5; Mix the ethanol evenly, and add 50% of the mixed total alcohol into the acidic potassium dichromate solution evenly within 15 minutes while stirring; cool the reaction solution to 80°C, and uniformly mix the remaining mixed total alcohol within 30 minutes Add the alcohol into the reaction solution while stirring; continue to feed sulfur dioxide gas under the stirring condition to completely reduce the hexavalent chromium in the solution to trivalent chromium, that is, the chrome tanning solution can not change the color of the acid starch potassium iodide; after the reduction is completed, stir while Add benzoic acid so that the ratio of chromium trioxide to benzoic acid in the solution is 1:0.3, then stir and react at 60°C for 3 hours, and spray dry to obtain a non-pickling chrome tanning a...

Embodiment 2

[0037] After dissolving a certain amount of potassium dichromate in water, add sulfuric acid to make the ratio of the amount of chromium trioxide and sulfuric acid in the solution to be 1:1.5; As a reducing agent, add 80% of the alcohol into the acidic potassium dichromate solution evenly within 60 minutes while stirring; cool the reaction solution to 50°C, and stir the remaining alcohol evenly within 60 minutes While adding to the reaction solution; continue to pass in sulfur dioxide gas under stirring conditions to completely reduce the hexavalent chromium in the solution to trivalent chromium, that is, the chrome tanning solution can not change the color of acid starch potassium iodide; after the reduction is completed, add benzene di Formic acid, so that the ratio of chromium trioxide and phthalic acid in the solution is 1:0.8, then stirred and reacted at 60°C for 0.5h, and spray-dried to obtain a non-pickling chrome tanning agent.

Embodiment 3

[0039] After dissolving a certain amount of potassium dichromate in water, add sulfuric acid so that the ratio of the amount of chromium trioxide and sulfuric acid in the solution is 1:1.8; Mix ethylene glycol evenly, and add 60% of the total alcohol content into the acidic potassium dichromate solution evenly within 30 minutes while stirring; cool the reaction solution to 60°C, and uniformly dissolve the remaining Add the mixed total alcohol into the reaction solution while stirring; continue to feed sulfur dioxide gas under the stirring condition, and completely reduce the hexavalent chromium in the solution to trivalent chromium, that is, the chrome tanning solution cannot change the color of the acid starch potassium iodide; after the reduction is completed, Add naphthalenesulfonic acid while stirring, so that the ratio of chromium trioxide to naphthalenesulfonic acid in the solution is 1:3, then stir and react at 51°C for 4 hours, and spray dry to obtain non-pickling chrom...

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PUM

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Abstract

The invention discloses a non-pickling chrome tanning agent. The chrome tanning agent is prepared by the following method: alcohols and sulfur dioxide are used as reducing agents, and the stepwise reduction method is used to control the reduction process by changing the temperature. Oxidation products were used to realize the directional formation of products and the regulation of the properties of chromium complexes, and a new non-pickling chrome tanning agent with good tanning effect was obtained. The preparation method is simple, and the product performance is stable, not only can be used for main tanning, but also can be applied to leather retanning, color fixing and other operations. Using the non-pickling chrome tanning agent to tan leather can not only avoid the operation of post-adding masking agent, but also has the fullness of the tanned leather of the sugar-reduced product and the light color of the sulfur dioxide-reduced product, which can make the application range of the tanned leather more extensive. wide.

Description

technical field [0001] The invention belongs to the technical field of preparation of leather chemical materials, in particular to a kind of non-pickled chrome which can directly tan bare leather under high pH value by adopting step-by-step reduction of alcohols and adding special auxiliary agents Tanning agent. Background technique [0002] The chrome tanning method is the only tanning method known so far that the shrinkage temperature of the finished leather can exceed 100°C by using a single tanning agent. Chrome tanned leather not only has good moisture and heat stability, but also has excellent softness, fullness and washing resistance. In addition, chrome tanning is easy to operate and stable in quality. Therefore, chrome tanning is currently the most important tanning method in leather processing. Chrome tanning agent is the basic material of chrome tanning. The chrome tanning agent currently used in the leather industry is a trivalent chromium complex prepared by re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/06C14C3/08
Inventor 张金伟孙宏斌陈武勇姚增劲
Owner GUANGDONG SHENGFANG CHEM