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Preparation method of anionic acrylic acid resin retanning agent

An acrylic resin and anionic technology, which can be used in animal husbandry, chemical treatment of small raw hides/large raw hides/leather skins/furs, etc. It can solve the problems of reducing the plastic feeling of the leather body, improve the plastic feeling, and increase the filling and replenishment. Strong effect, effect of improving discoloration

Active Publication Date: 2016-09-07
传化智联股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects that traditional acrylic retanning agents are prone to discoloration and plastic feeling, and to provide a preparation method of anionic acrylic resin retanning agents. Discoloration effect during leather dyeing to greatly reduce the plastic feeling of the leather body; and the acrylic resin retanning agent of the present invention is polymerized by ordinary acrylic acid and its ester monomers to reduce costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The preparation method of anionic acrylic resin retanning agent, its step is as follows:

[0021] 1) Add 200-260kg deionized water and 100-150kg ethylene glycol monomethyl ether into the polymerization kettle, stir and heat to 75-80°C to obtain a mixed solution of ethylene glycol monomethyl ether and water;

[0022] 2) Add 120-180 kg of acrylic acid, 30-60 kg of methacrylic acid, 30-60 kg of methyl methacrylate, 20-30 kg of butyl acrylate and 10-30 kg of acrylonitrile into the stirred tank, and stir to obtain a mixed monomer;

[0023] 3) Dissolve 2 to 4 kg of benzoyl peroxide in 20 to 40 kg of acetone to obtain a benzoyl peroxide solution;

[0024] 4) To the mixed solution of ethylene glycol monomethyl ether and water at a temperature of 75-80°C, add the mixed monomer and benzoyl peroxide solution synchronously and uniformly for 2-3 hours, and keep warm after the addition is completed 1 to 2 hours;

[0025] 5) The temperature in the polymerization kettle is lowered to...

Embodiment 1

[0027] First, add 200 kg of deionized water and 120 kg of ethylene glycol monomethyl ether into the polymerization kettle, stir and heat to 78° C. to obtain a mixed solution of ethylene glycol monomethyl ether and water.

[0028] Add 150kg of acrylic acid, 50kg of methacrylic acid, 50kg of methyl methacrylate, 30kg of butyl acrylate and 20kg of acrylonitrile in the stirred tank, and stir to obtain a mixed monomer; get 3kg of benzoyl peroxide and dissolve it in 27kg of acetone, dissolve Completely obtain benzoyl peroxide solution.

[0029] To the mixed solution of ethylene glycol monomethyl ether and water at a temperature of 78°C, add the mixed monomer and benzoyl peroxide solution synchronously and uniformly for 2 hours, and keep warm for 2 hours after the addition; The temperature in the kettle is lowered to 40°C, the pH of the system is adjusted to 6.5 with 25% by mass of ammonia water, a certain amount of deionized water is added to the polymerization kettle, and after mix...

Embodiment 2

[0031] First, add 220kg of deionized water and 150kg of ethylene glycol monomethyl ether into the polymerization kettle, stir and heat to 79°C to obtain a mixed solution of ethylene glycol monomethyl ether and water.

[0032] Add 180kg acrylic acid, 30kg methacrylic acid, 40kg methyl methacrylate, 30kg butyl acrylate and 20kg acrylonitrile in the stirred tank again, stir to obtain mixed monomer; get 3.5kg benzoyl peroxide and dissolve in 31.5kg acetone , after the dissolution is complete, the benzoyl peroxide solution is obtained.

[0033] To the mixed solution of ethylene glycol monomethyl ether and water at a temperature of 77°C, add the mixed monomer and benzoyl peroxide solution synchronously and uniformly for 3 hours, and keep warm for 2 hours after the addition; The temperature in the kettle is lowered to 40°C, the pH of the system is adjusted to 6.5 with 25% by mass of ammonia water, a certain amount of deionized water is added to the polymerization kettle, and after mi...

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Abstract

The invention discloses a preparation method of an acrylic acid resin retanning agent. At present, acrylic acid resin retanning agents which can simultaneously overcome the defects of pastel shade and plastic feeling are all imported products, and the leather making cost is greatly increased. The preparation method is characterized by comprising the steps that a mixed monomer and a benzoyl peroxide solution are synchronously dropwise added to a mixed solution of ethylene glycol monomethyl ether and water at a constant speed for 2 h to 3 h, and heat preservation is conducted for 1 h to 2 h after dropwise adding is completed, wherein the temperature of the mixed solution ranges from 75 DEG C to 80 DEG C; the temperature in a polymeric kettle is cooled to 30 DEG C to 40 DEG C, ammonia water of which the mass percent ranges from 20%-30% is used for regulating the pH of the system to range from 6.0 to 7.0, and the acrylic acid resin retanning agent is obtained. The prepared acrylic acid resin retanning agent can obviously improve the pastel shade effect in the dyeing process of crust leather, and the plastic feeling of leather is greatly reduced.

Description

technical field [0001] The invention relates to a preparation method of a retanning agent for tanning, in particular to a preparation method of an anionic acrylic resin retanning agent. Background technique [0002] Retanning occupies a very important position in the modern leather industry, and is hailed as the "alchemy" by the leather industry. Especially for light leather, retanning is almost an indispensable process. The quality of the retanning material determines the quality of the retanning effect. In recent years, various resin retanning agents have been greatly developed, among which acrylic resin retanning agents are the most popular and fastest-growing category. Acrylic retanning agent is a copolymer type polymer tanning agent obtained by free radical copolymerization of (meth)acrylic acid and other vinyl monomers, auxiliary agents, etc. The various groups on the chain and the chromium salt in the chrome tanned leather are chemically combined. It is a polymer ret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/14C08F220/18C08F220/44C14C3/22
CPCC08F220/06C14C3/22C08F220/14C08F220/1804C08F220/44
Inventor 付海宏王小君闫哲陈八斤
Owner 传化智联股份有限公司
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