Chrome containing tanning agent and preparation method thereof

A technology of chrome tanning agent and mixture, which is applied in the field of new chrome-containing tanning agent and its preparation, can solve the problem of high content of free formaldehyde, and achieve the effect of good level dyeing, low chromium content and light color

Inactive Publication Date: 2014-04-30
北京泛博科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

DLT-15 developed by China Dandong Light Chemical Industry Research Institute # Leather chrome-containing tanning agent, bifunctional chrome-containing tanning agent ST-tf developed by Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, SM and SRT syntans developed by Sichuan University, etc. are all based on 4,4-dihydroxydiphenyl sulfone and formaldehyde. The chrome-containing tanning agent made of raw materials has better performance, but the content of free formaldehyde in the product is relatively high

Method used

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  • Chrome containing tanning agent and preparation method thereof
  • Chrome containing tanning agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Put 40 parts of bisphenol S in the reactor, dissolve 10 parts of sodium hydroxide with 50 parts of water and put it into the reactor, make the pH value to 7.0-9.0, raise the temperature to 55-60°C, wait After the temperature is stable, slowly add 30 parts of THPS (purchased according to the content of 75% in the aqueous solution), keep the temperature of the reaction system not higher than 65°C, raise the temperature to 95-100°C after the addition, react for 6-8 hours, add water to dilute after cooling down , get material A.

[0035] (2) React all of the above material A and 10 parts of benzoic acid at a controlled temperature of 55-60° C. for 1 hour, then adjust the pH value to 1-2 with 50 parts of 33% dilute sulfuric acid to obtain material B.

[0036] (3) Put 30 parts of chromium powder (for example, basic chromium sulfate), 25 parts of material B, 10 parts of formic acid and 50 parts of water into the reactor, control the temperature at 80-90 ° C, stir and react...

Embodiment 2

[0038] (1) Put 40 parts of bisphenol A, 15 parts of ethanolamine and 20 parts of water in the reactor, make the pH value to 7.0-9.0, raise the temperature to 55-60°C, and slowly add 50 parts of THPC after the temperature is stable (purchased according to the content of 75% in aqueous solution), keep the temperature of the reaction system not higher than 65°C, raise the temperature to 95-100°C after feeding, react for 6-8 hours, add water to dilute after cooling down, and obtain material A.

[0039] (2) All the above-mentioned materials A and 20 parts of glyoxylic acid (purchased according to the content of 40% in aqueous solution) were reacted for 1 hour at a controlled temperature of 55-60 ° C, and then 60 parts of 33% dilute sulfuric acid was used to adjust the pH value to 1-2, get material B.

[0040] (3) Put 60 parts of chromium powder, 40 parts of material B, 10 parts of formic acid and 90 parts of water into the reactor, control the temperature at 80-90°C, stir and react...

Embodiment 3

[0042] (1) Put 30 parts of bisphenol S, 10 parts of bisphenol A, 20 parts of diethanolamine and 40 parts of water in the reactor, make the pH value to 7.0-9.0, raise the temperature to 55-60°C, and wait until the temperature is stable Finally, slowly add 30 parts of THPS (purchased according to the content of 75% in aqueous solution), keep the temperature of the reaction system not higher than 65°C, heat up to 95-100°C after the addition, react for 6-8 hours, add water to dilute after cooling down, and obtain Material A.

[0043] (2) React all of the above material A and 10 parts of benzoic acid at a controlled temperature of 55-60° C. for 1 hour, then adjust the pH value to 1-2 with 48 parts of 33% dilute sulfuric acid to obtain material B.

[0044] (3) Put 40 parts of chromium powder, 35 parts of material B, 10 parts of formic acid and 70 parts of water into the reactor, control the temperature at 80-90°C, stir and react at constant temperature for 3 hours, lower the tempera...

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Abstract

The invention relates to a novel chrome containing tanning agent and a preparation method thereof. The chrome containing tanning agent is prepared by the following steps of: synthesizing a sulphone condensate intermediate from phenolic hydroxyl and organic phosphor salt, then mixing with all kinds of organic acids, adjusting the pH value of the mixture to be acidic, and compounding and complexing with a basic chromic salt at 80-90 DEG C under an acidic condition. The chrome containing tanning agent provided by the invention has a lower free formaldehyde content and good characteristics of a chrome tanning agent, and also the chrome content in the tanning waste liquid is reduced.

Description

technical field [0001] The invention relates to a chrome-containing tanning agent and a preparation method thereof, in particular to a novel chromium-containing tanning agent suitable for processing light-colored and white soft bovine upper leather (cattle, buffalo, yak upper leather, etc.), pig garment leather and glove leather. Chrome tanning agent and its preparation method. Background technique [0002] The characteristic of chrome tanning is that it can ensure fine grain and soft hand feeling of leather, but the leather after tanning is flat and lacks due plumpness. uneven. The use of synthetic tanning agents to tan leather has better filling properties, which makes the leather obtain proper fullness, and also improves the polishing performance of the leather due to the increased thickness of the leather. In addition, the tanned leather also has properties such as light fastness and level dyeing, thereby improving the performance of chrome tanned leather. [0003] U....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/02C14C3/04C14C3/08
Inventor 郑超斌强西怀段郑军
Owner 北京泛博科技有限责任公司
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