Acrylic resin retanning agent and preparation method thereof

A technology of acrylic resin and retanning agent, which is applied in animal husbandry, small raw hide/large raw hide/leather skin/fur chemical treatment, application, etc. It can solve the problem of unsuitable temperature control, affecting the absorption of dyes and fat agents, and high synthesis temperature. problems, to achieve the effect of facilitating absorption, improving dyeing and fatliquoring effects, and smooth reaction

Active Publication Date: 2013-09-25
SICHUAN DOWELL SCI & TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the Chinese patent literature with the publication number CN101851310A discloses a preparation method of an acrylic acid retanning agent. First, acrylic acid, a chain transfer agent, an initiator, an oxidizing agent and a regulator are mixed in an aqueous solution containing a pH buffer solution at a temperature of 98°C to 102°C. After the polymerization reaction is completed, add a regulator solution to continue the reaction at 80 ° C ~ 85 ° C, then add sodium hydroxide solution to continue the reaction, continue to heat up to 100 ° C, add an oxidant solution to keep the temperature and react to obtain an acrylic retanning agent. The acrylic retanning agent obtained by the method has narrow molecular weight distribution, moderate molecular weight, good permeability and filling property, good absorption, and can effectively reduce the poor position of leather and the content of chromium in wastewater. After retanning, the leather is soft and plump, grainy However, the synthesis temperature of this method is high, and the heat release of the acrylic monomer is serious during the synthesis process, and the temperature in the reaction process is not suitable for control, and the obtained acrylic retanning agent has discoloration, which will cause Affect the absorption of dyes and lipids

Method used

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  • Acrylic resin retanning agent and preparation method thereof
  • Acrylic resin retanning agent and preparation method thereof

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preparation example Construction

[0046] The present invention also provides a kind of preparation method of the described acrylic resin retanning agent of above-mentioned technical scheme, comprises the following steps:

[0047] a) mixing acrylic acid or methacrylic acid, acyloxyethyltrimethylammonium methacrylate, ethyl acetoacetoxymethacrylate, chain regulator, catalyst and water to obtain a mixture;

[0048] b) The mixture obtained in step a) is mixed with the first initiator to carry out a polymerization reaction for 90 minutes to 120 minutes; the first initiator is peroxide or persulfate;

[0049] c) adding a second initiator to the reaction product obtained in step b) to continue the reaction; the second initiator is azobisisobutylamidine hydrochloride;

[0050] d) adding alkali and water to the reaction product obtained in step c) to obtain an acrylic resin retanning agent.

[0051] In the present invention, firstly, acrylic acid or methacrylic acid, methacrylic acid acyloxyethyl trimethyl ammonium ch...

Embodiment 1

[0069] Adding 240kg water, 640kg mass concentration in the premix tank is 78% methacrylic acid acyloxyethyltrimethylammonium chloride (DMC), 480kg acrylic acid, 80kg acetoacetoxy ethyl methacrylate (AAEM), 8kg Mercaptoethanol and 5.6kg mass concentration are 1% ferrous sulfate solution, after stirring for 20 minutes, the mixture is obtained;

[0070] Adding 105kg of mass concentration to the head tank is a 30% hydrogen peroxide solution, adding 640kg of deionized water to the reactor, and adding the mixture and the hydrogen peroxide solution dropwise to the reactor after the temperature is raised to 35° C. The dropping time is controlled at 1.5h~2h; after the dropping, the temperature rises naturally to 70°C~80°C, reacts at this temperature for 30min, then heats up to 80°C~85°C, stirs for 1h, and then slowly adds 36kg mass concentration It is a 10% azobisisobutylamidine hydrochloride (V50) solution, and the addition time is 20min to 30min. After the addition of V50 is complete...

Embodiment 2

[0072] Add 240kg water, 720kg mass concentration in the premix tank and be 78% methacrylic acid acyloxyethyl trimethyl ammonium chloride (DMC), 510kg acrylic acid, 64kg acetoacetoxy ethyl methacrylate (AAEM), 16kg Mercaptopropionic acid and 5.6kg mass concentration are 1% ferrous sulfate solution, after stirring for 20 minutes, the mixture is obtained;

[0073]Adding 112kg of mass concentration to the header tank is a 30% hydrogen peroxide solution, adding 640kg of deionized water to the reactor, and adding the mixture and the hydrogen peroxide solution dropwise to the reactor after the temperature is raised to 30° C. The dropping time is controlled at 1.5h~2h; after the dropping, the temperature rises naturally to 70°C~80°C, reacts at this temperature for 30min, then heats up to 80°C~85°C, stirs for 1h, and then slowly adds 38kg mass concentration It is a 10% azobisisobutylamidine hydrochloride (V50) solution, and the addition time is 20min to 30min. After the addition of V50...

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Abstract

The invention provides an acrylic resin retanning agent, which is obtained by polymerization of the following raw materials in water: crylic acid or methacrylic acid; methacryloyloxyethyl trimethyl ammonium chloride; acetoacetate ethyl methacrylate; chain regulator; catalytic agent and initiator. The invention also provides a preparation method of the acrylic resin retanning agent. According to the method, polymerization of acrylic monomers can be initiated at low temperature, so that the stability of a reaction system in a feeding period is easy to control, the reaction is stable, the energy consumption can be saved, and the green production is favored. The acrylic resin retanning agent provided by the invention has favorable filling performance and convergence performance, the compactibility of hide fiber can be improved, the color loss can be avoided, the absorption of dye and fatliquor is favored, the absorption rate is improved, the waste water emission is reduced, and the effects of dyeing and fatliquoring are improved.

Description

technical field [0001] The invention belongs to the technical field of retanning agents for tanning, and in particular relates to an acrylic resin retanning agent and a preparation method thereof. Background technique [0002] Retanning is an indispensable process in the process of leather making. It is known as the "golden touch" of leather making. Retanning can improve the fullness, firmness, and reduce the difference in parts of the leather, and it is also beneficial to subsequent processes. carried out. [0003] Retanning agents are tanning materials added during the retanning process, mainly including acrylic resin retanning agents, amino resin retanning agents, oxazolidine retanning agents, etc. Among them, acrylic resin has good water dispersibility, good binding ability with leather, strong filling ability, obvious thickening effect on leather, and can also endow leather with good softness, fullness and elasticity. At the same time, the carboxyl group in the acryli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/34C08F222/20C14C3/22
Inventor 董茂胜彭必雨严建林
Owner SICHUAN DOWELL SCI & TECH INC
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