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Aminated modified glycosyl aldehyde tanning agent and preparation method thereof

An aldehyde-based tanning agent and amination technology, which is applied in the fields of fur tanning and leather, can solve the problems of low concentration, low isoelectric point of tanned leather, inability to directly separate iodate, etc., so as to improve isoelectric point and aldehyde group content. High, good tanning effect

Active Publication Date: 2019-09-17
四川亭江新材料股份有限公司 +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing an amino-modified sugar-based aldehyde tanning agent to overcome the low concentration of existing polyaldehyde-based organic tanning agents, the inability to directly separate iodate and the low isoelectric point of tanned leather. Shortcomings

Method used

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  • Aminated modified glycosyl aldehyde tanning agent and preparation method thereof

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Effect test

Embodiment 1

[0021] In parts by weight, take 100 parts of sucrose, dissolve it in 500 parts of water, then add 150 parts of sodium periodate to avoid light and react for 12 h. After the reaction, adjust the pH to 6.0 with sodium hydroxide, stir, and filter to separate the iodate Precipitate, collect the filtrate to obtain sugar-based aldehyde tanning agent; get 100 parts of the above-mentioned sugar-based aldehyde tanning agent, heat up to 80 ºC, then add 10 parts of urea under stirring, add dropwise sodium hydroxide solution to control the pH of the reaction system to be 8.0, react After 4 h, the temperature was adjusted to 60 ºC, and the pH of the reaction system was adjusted to 4.0 with hydrochloric acid solution, and the reaction was continued for 2 h to obtain an amino-modified sugar-based aldehyde tanning agent. The aldehyde content of the tanning agent was 6.5 mmol / g. The tanning agent is used for pickling cowhide tanning, and the isoelectric point of the tanned leather is 5.4.

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Embodiment 2

[0029] In parts by weight, take 100 parts of sucrose, dissolve it in 100 parts of water, then add 180 parts of sodium periodate to avoid light and react for 8 hours. After the reaction, adjust the pH to 5.5 with sodium metasilicate, stir, and filter to separate iodic acid Salt precipitation, collecting the filtrate to obtain sugar-based aldehyde tanning agent; get 100 parts of the above-mentioned sugar-based aldehyde tanning agent, heat up to 60 ºC, then add 4 parts of melamine under stirring, add dropwise sodium hydroxide solution to control the pH of the reaction system to be 7.0, After reacting for 1 h, the temperature was adjusted to 50 ºC, and the pH of the reaction system was adjusted to 6.5 with hydrochloric acid solution, and the reaction was continued for 4 h to obtain an amino-modified sugar-based aldehyde tanning agent. The aldehyde content of the tanning agent was 8.8 mmol / g. The tanning agent is used for pickling cowhide tanning, and the isoelectric point of the t...

Embodiment 3

[0035] In parts by weight, take 100 parts of cellobiose, dissolve it in 200 parts of water, then add 250 parts of sodium periodate to avoid light and react for 24 hours. After the reaction, adjust the pH to 6.5 with sodium hydroxide, stir, and filter to separate the iodine Acetate precipitation, collect the filtrate to obtain sugar-based aldehyde tanning agent; take 100 parts of the above-mentioned sugar-based aldehyde tanning agent, heat up to 70 ºC, then add 8 parts of urea under stirring, add dropwise sodium hydroxide solution to control the pH of the reaction system to 9.0 , after reacting for 2 h, adjust the temperature to 80 ºC, and adjust the pH of the reaction system to 5.5 with hydrochloric acid solution, and continue the reaction for 1 h to obtain the amino-modified sugar-based aldehyde tanning agent. The aldehyde content of the tanning agent was 11.0 mmol / g. The tanning agent is used for pickling cowhide tanning, and the isoelectric point of the tanned leather is 5....

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Abstract

The invention discloses an amino modified glycosyl aldehyde tanning agent, which is prepared from the following raw materials in parts by weight: 100 parts of a glycosyl aldehyde tanning agent and 4-10 parts of an amino compound; according to the preparation method of the amino modified glycosyl aldehyde tanning agent, after first-step reaction is finished, direct filtration and separation can be carried out to respectively obtain the high-concentration glycosyl aldehyde tanning agent and an iodate precipitate, the preparation process is simplified, and the preparation cost of the amino modified glycosyl aldehyde tanning agent is obviously reduced.

Description

technical field [0001] The invention belongs to the field of leather and fur tanning, and in particular relates to a preparation method of an amino-modified sugar-based aldehyde tanning agent. Background technique [0002] Sugar biomass has the advantages of wide sources, safety, non-toxicity, and regeneration, and is a kind of green raw material that can be used in the manufacture of leather tanning agents. Among them, sugar biomass containing vicinal diol structure can be selectively oxidized by periodic acid / periodate to produce aldehyde groups, which can be used for tanning of leather and fur. Chinese patent CN 107217116 A "A full-component, wide-distributed polyaldehyde-based organic tanning agent and its preparation method" provides a method for preparing a polyaldehyde-based organic tanning agent. In order to separate and recover iodate, the method involves Oxidation, reduction, filtration, heat treatment and other steps. Among them, the reduction step needs to add ...

Claims

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Application Information

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IPC IPC(8): C14C3/08
CPCC14C3/08
Inventor 丁伟王亚楠石碧李靖易玉丹周建飞
Owner 四川亭江新材料股份有限公司
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