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Method for preparing amphoteric retanning agent

A retanning agent and amphoteric technology, which is applied in the field of preparation of amphoteric retanning agents, can solve problems such as limiting the application of amphoteric retanning agents, precipitation or gelation, and intensified proteolysis

Active Publication Date: 2016-03-09
SHANGHAI GOLD LION CHEM CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

The above-mentioned modification conditions must be between pH 6 and 8. If the pH value is too low, precipitation or gel will occur in the reaction, and if the pH value is too high, proteolysis will be intensified; the reaction conditions of the above-mentioned process are not easy to control, thus limiting amphoteric retanning agent application

Method used

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  • Method for preparing amphoteric retanning agent
  • Method for preparing amphoteric retanning agent
  • Method for preparing amphoteric retanning agent

Examples

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preparation example Construction

[0021] The embodiment of the invention discloses a preparation method of an amphoteric retanning agent, comprising the following steps:

[0022] A), casein is dissolved under acidic conditions to obtain a casein solution;

[0023] B), the casein solution, initiator, chain transfer agent and polymerized monomer obtained in step A) are grafted and polymerized, and the amphoteric retanning agent is obtained after neutralization; the polymerized monomer is selected from acrylic acid and methacrylic acid one or both.

[0024] According to the present application, casein is a natural protein and has amphoteric properties. Under acidic conditions, casein is dissolved to form a cationic casein solution, and then it is grafted with one or both of acrylic acid and methacrylic acid After polymerization and neutralization, a casein-modified amphoteric retanning agent is obtained.

[0025] According to the present invention, casein is firstly dissolved under acidic conditions to obtain a...

Embodiment 1

[0037] Add 130 grams of casein, 1300 grams of deionized water, 15.5 grams of formic acid, and 8.0 grams of lactic acid into a 2000ml four-neck flask in sequence, stir, heat up, keep warm at 75-80°C for 2-3 hours, and completely dissolve to form a casein solution ,spare.

Embodiment 2

[0039] Take 726.7 grams of casein solution in Example 1, add 130 grams of 50% caprolactam aqueous solution, control the temperature at 75° C., continue to keep warm for 2 to 3 hours, then add 520 grams of deionized water, stir evenly, cool to room temperature, and set aside.

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Abstract

The invention provides a method for preparing an amphoteric retanning agent. The method includes the following steps that casein is dissolved under the acidic condition, so that a casein solution is obtained; the obtained casein solution, an initiator, a chain transfer agent and a polymeric monomer are subjected to graft polymerization, and the amphoteric retanning agent is obtained after neutralization. The polymeric monomer is one or two of acrylic acid and methacrylic acid. According to the method, the natural protein characteristic of the casein is utilized, the casein is dissolved under the acidic condition so that the graft polymerization can be conducted more easily, and the amphoteric retanning agent is obtained. The casein-modified amphoteric retanning agent is simpler, more convenient to use and prone to industrial production. The prepared amphoteric retanning agent has a good retanning effect.

Description

technical field [0001] The invention relates to the technical field of leather chemical industry, in particular to a preparation method of an amphoteric retanning agent. Background technique [0002] In tanning production, due to the requirements of green environmental protection, it is necessary to reduce the discharge of residual chemical materials in waste liquid and reduce the COD and BOD in waste liquid, so the requirements for chemical materials are becoming more and more stringent. Amphoteric retanning agent has a very unique role in the tanning process. It not only maintains the excellent retanning performance of ordinary retanning agents, but also has good compatibility, and relatively increases the absorption of other anionic materials such as dyes and fatliquor. , so it has received more and more attention in the current tanning production. [0003] Casein is casein, which contains amino, imino, carboxyl and other functional groups. Because of its luster, brightn...

Claims

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Application Information

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IPC IPC(8): C08F289/00C08F220/06C08F8/44C14C3/22
CPCC08F8/44C08F289/00C14C3/22C08F220/06
Inventor 陈华严建林石碧蒋春燕
Owner SHANGHAI GOLD LION CHEM CO LTD
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