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Preparation method of amphoteric retanning fatliquor

A retanning fatliquoring and amphoteric technology is applied in the field of preparation of amphoteric retanning and fatliquoring agents, which can solve the problems of insufficient alkali resistance and electrolytic resistance, restricting applications, etc., and achieve the effects of avoiding the release of VOC and improving the absorption rate.

Inactive Publication Date: 2012-10-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The products studied above are all anionic fatliquoring agents with carboxyl and sulfonic acid groups. They have good fatliquoring and acid resistance, but their alkali resistance and electrolysis resistance are slightly insufficient, which limits their application in the fatliquoring process of tanning.

Method used

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  • Preparation method of amphoteric retanning fatliquor

Examples

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Embodiment 1

[0022] A preparation method of an amphoteric retanning fatliquoring agent, comprising the following steps:

[0023] The first step, amidation modification of oil:

[0024] Add 950 parts by mass of natural animal and vegetable oils, 61 parts by mass of monoethanolamine and 5.1 parts by mass of the first catalyst into a reactor equipped with a stirrer and a thermometer, and after mixing uniformly, heat up to 130°C. React for 4 hours to obtain system A, the natural animal and vegetable oil is rapeseed oil, and the first catalyst is sodium methylate;

[0025] The second step, esterification modification:

[0026] Add 196 parts by mass of maleic anhydride and 6 parts by mass of the second catalyst to system A, mix evenly and then raise the temperature to 120°C for 2 hours, cool down to 50°C after the reaction, and use a base with a mass concentration of 20% The neutralization system pH of the alkaline aqueous solution is 7.0 to obtain system B, the second catalyst is p-toluenesul...

Embodiment 2

[0030] A preparation method of an amphoteric retanning fatliquoring agent, comprising the following steps:

[0031] The first step, amidation modification of oil:

[0032] Add 950 parts by mass of natural animal and vegetable oils, 122 parts by mass of monoethanolamine and 5.4 parts by mass of the first catalyst into a reactor equipped with a stirrer and a thermometer, and after mixing uniformly, heat up to 150°C. React for 3 hours to obtain system A, the natural animal and vegetable oil is linseed oil, and the first catalyst is sodium methylate;

[0033] The second step, esterification modification:

[0034] Add 392 parts by mass of maleic anhydride and 7.3 parts by mass of the second catalyst to system A, mix uniformly and then raise the temperature to 90°C for 4 hours, cool down to 60°C after the reaction, and use a base with a mass concentration of 30% The neutralization system pH of the alkaline aqueous solution is 7.0 to obtain system B, the second catalyst is sulfuric...

Embodiment 3

[0038] A preparation method of an amphoteric retanning fatliquoring agent, comprising the following steps:

[0039] The first step, amidation modification of oil:

[0040] Add 950 parts by mass of natural animal and vegetable oil, 100 parts by mass of monoethanolamine and 5.3 parts by mass of the first catalyst into a reactor equipped with a stirrer and a thermometer, and after mixing uniformly, heat up to 140°C. Reaction 3h, obtain system A, described natural animal and vegetable oil is castor oil, described first catalyst is sodium hydroxide;

[0041] The second step, esterification modification:

[0042] Add 321 parts by mass of maleic anhydride and 6.9 parts by mass of the second catalyst to system A, mix them uniformly, then raise the temperature to 110°C for 3 hours, cool down to 50°C after the reaction, and use a base with a mass concentration of 25% The neutralization system pH of the alkaline aqueous solution is 7.0, and the system B is obtained, the second catalyst...

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Abstract

The invention provides a preparation method of amphoteric retanning fatliquor. The preparation method comprises the steps of: carrying out amidate modification on oil; adding natural animal or vegetable oil, monoethanolamine and a first catalyst to a reactor which is provided with a mixer and a thermometer for being uniformly mixed, and then heating to react to obtain a system A; carrying out esterification modification, and adding maleic anhydride and a second catalyst in the system A, and uniformly mixing, and then heating to react, and cooling after the completion of the reaction, neutralizing the pH of the system into 7.0 through an alkaline aqueous solution, thus obtaining a system B; carrying out polymerization reaction, heating the system B, and synchronously dropwise adding acrylic acid derivatives, an amino cationic vinyl monomer aqueous solution and an initiator aqueous solution, and then heating to react, thus obtaining a system C; and compensating and metering water, and adjusting the content of effective solid in the system C to obtain the amphoteric retanning fatliquor. The amphoteric retanning fatliquor has high acid resistance, alkali resistance, salt resistance and electrolyte resistance, and is suitable for amphoteric retanning fatliquoring technologies under various conditions.

Description

technical field [0001] The present invention relates to the field of leather chemical production technology, in particular to a preparation method of an amphoteric retanning and fatliquoring agent. Background technique [0002] Leather retanning fatliquor has a very unique role in leather production. While maintaining a certain retanning effect, it also has good fatliquoring performance, giving leather products a good oily feeling, plumpness and elasticity, etc. features. General leather retanning and fatliquoring agents have multiple active groups, such as carboxyl, phosphate, etc., which can complex with chromium salts and other multivalent metal salts, and at the same time combine with leather collagen fibers, which can endow leather with long-term fatliquoring Effect. [0003] The patent with the publication number CN101603101A discloses a leather retanning and fatliquoring agent and a preparation method thereof. Polymerize maleic anhydride and fatty amine under the a...

Claims

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Application Information

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IPC IPC(8): C08F220/34C08F220/06C08F220/48C08F222/22C14C3/22C07C233/18C07C233/20C07C231/02C07C231/12
Inventor 强西怀崔燕朋张辉刘子龙
Owner SHAANXI UNIV OF SCI & TECH
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