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Amphoteric leather tanning agent as well as preparation method and application thereof

A tanning agent and leather technology, which is applied in the field of amphoteric leather tanning agent and its preparation, can solve the problems of poor yellowing resistance and strong anionic properties of leather fibers, etc., and achieve the effect of increasing yellowing resistance and enhancing cationicity

Pending Publication Date: 2022-05-17
四川德赛尔新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide an amphoteric leather tanning agent, which can completely or partially solve the problems in the prior art of poor yellowing resistance of leather tanned with aromatic syntans and strong anionic properties on the surface of leather fibers The problem

Method used

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  • Amphoteric leather tanning agent as well as preparation method and application thereof
  • Amphoteric leather tanning agent as well as preparation method and application thereof
  • Amphoteric leather tanning agent as well as preparation method and application thereof

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preparation example Construction

[0036] In some embodiments of the present invention, the preparation method of the aforementioned amphoteric leather tanning agent comprises: reacting a phenolic aromatic syntan with compound A under the action of a basic catalyst to obtain an amphoteric leather tanning agent;

[0037] Phenolic aromatic syntans have the following structural formula:

[0038]

[0039] The structural formula of compound A is:

[0040] In some embodiments of the present invention, the structural formula of the compound is:

[0041] In some specific embodiments of the present invention, compound A is 2,3-epoxypropyltrimethylammonium chloride.

[0042] In some embodiments of the present invention, phenolic aromatic syntans include Basyntan DLE, Trupotan G, One or more of BTL and MZ 7113.

[0043] In some embodiments of the present invention, the basic catalyst includes one or more of sodium methoxide, sodium hydroxide and potassium hydroxide.

[0044] In some embodiments of the present ...

Embodiment 1

[0062] The present embodiment provides the preparation method of amphoteric syntan, comprises the steps:

[0063] (A) 150 g of aqueous solution of 45% Basyntan DLE tanning agent and 0.34 g of sodium methylate are added in a constant temperature reactor with a thermometer and a mechanical stirring device, the temperature is raised to 70° C., and then slowly poured into the above-mentioned reaction vessel within 1 h. Add dropwise 13.6g of an aqueous solution of 2,3-epoxypropyltrimethylammonium chloride with a mass percentage of 45%, and control the temperature at 70±2°C during the dropwise addition; continue to react at 70°C for 3h after the dropwise addition is completed , to obtain the reaction solution;

[0064] (B) After cooling the above reaction solution to 40° C., 1.5 g of formic acid was added to adjust the pH of the reaction solution to 4 to obtain an amphoteric leather tanning agent (1a). The solid content of the reaction solution was 45%.

Embodiment 2

[0066] The present embodiment provides the preparation method of amphoteric syntan, comprises the steps:

[0067] (A) 200g of aqueous solution of 47% Trupotan G tanning agent and 0.75g of sodium hydroxide are added in a constant temperature reactor with a thermometer and a mechanical stirring device, the temperature is raised to 80°C, and then in the above-mentioned reaction vessel within 2h Slowly add 24.2g of an aqueous solution of 2,3-epoxypropyltrimethylammonium chloride with a mass percentage of 47%, and control the temperature at 80±2°C during the dropwise addition; continue to react at 80°C after the dropwise addition is completed 4h, obtain reaction solution;

[0068] (B) After cooling the above reaction solution to 45° C., 2.0 g of formic acid was added to adjust the pH of the reaction solution to 5 to obtain an amphoteric leather tanning agent (2a). The solid content of the reaction solution was 47%.

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Abstract

The invention relates to the technical field of tanning, in particular to an amphoteric leather tanning agent and a preparation method and application thereof. According to the method, an aromatic synthetic tanning agent containing a phenolic hydroxyl group is adopted, then a quaternary ammonium compound containing an epoxy group is used for graft modification of the aromatic synthetic tanning agent, and through ring-opening reaction of the active phenolic hydroxyl group and the epoxy group, the quaternary ammonium group capable of supplementing the cationic property of the collagenous fiber is introduced to the phenolic hydroxyl group, so that the cationic property of the collagenous fiber is improved; thus, cationization modification of part of active phenolic hydroxyl groups is realized; leather retanned by the amphoteric leather tanning agent obtained through grafting modification has excellent yellowing resistance, and the cationic property of the collagenous fiber surface is enhanced.

Description

technical field [0001] The invention relates to the technical field of leather making, in particular to an amphoteric leather tanning agent and its preparation method and application. Background technique [0002] Tanning plays an important role in leather processing and production. This process is a key step in turning waste raw leather into leather and realizing the reuse of waste resources. Leather main tanning agents and retanning agents play an important role in leather tanning. These chemicals can cross-link with the active groups on raw hide collagen fibers, thereby improving the dry stability and wet heat resistance of leather. , fullness, mechanical strength, acid resistance, alkali resistance, air permeability and hygienic performance. [0003] Chemicals for leather tanning are essentially divided into inorganic tanning agents and organic tanning agents. Inorganic tanning agents mainly refer to chromium, zirconium, aluminum, titanium-based metal salt tanning agen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/08
CPCC14C3/08
Inventor 丁学斌谢超彭章义李燕
Owner 四川德赛尔新材料科技有限公司
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