Method for preparing carboxylated NBR latex

A carboxylated nitrile latex and emulsifier technology, applied in the field of carboxylated nitrile latex preparation, can solve the problems of reducing residual monomer content, uneven product quality, etc., to avoid violent polymerization and punching, milky white color, elongation long-term effect

Inactive Publication Date: 2005-09-21
DONGYING JIUZHOU AOHUA CHEM
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Problems solved by technology

The continuous addition of monomers with high reactivity overcomes the shortcoming that these monomers are prone to violent polymerization when they are added completely at one time, so that the production process is more stable and safe. At the same time, it also overcomes the quality of the products produced by adding these mono

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  • Method for preparing carboxylated NBR latex

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[0012] 1. Polymerization

[0013] Under vacuum conditions, according to the weight percentage specified in the formula, the deionization tank 1, the emulsifier solution tank 3, the pH value adjustment tank 4, the persulfate initiator tank 5, and the butadiene monomer tank 6 are placed in the polymerization still. Add deionized water 120, emulsifier 3.3, molecular weight regulator 0.6, pH regulator 0.5, persulfate free radical initiator 0.7, then add butadiene monomer 55 with lower reactivity at one time, start the polymerization kettle 7 Stirrer to mix the materials evenly, heat up to 45°C, and mix the monomer mixture in the mixing tank 8 when the reaction pressure is 0.3-0.5Mpa, that is, 36 parts of acrylonitrile, 5.5 parts of unsaturated carboxylic acid, unsaturated 3.5 parts of carboxylate was continuously added with a metering pump for 12 hours. When the conversion rate exceeded 99%, the reaction was stopped, and then the next step was performed.

[0014] 2. Degassing

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Abstract

The invention relates to a method preparing carboxylic butyronitrile-butadiene, its components comprise deionized water, emulsifying agents, molecular weight regulating agents, PH regulating agents, peroxodisulfate free initiator, butadiene monomers, acrylic nitrile, unsaturated carboxylic acid and unsaturated carboxylic ester, and the process comprises: adding the said components in a percentage by weight of 90-140 % of deionized water, 2.2-3.6 % of emulsifying agents, 0.5-1.5 % molecular weight regulating agents, 0.2-0.5 % of PH regulating agents and 0.3-1.1 % of peroxodisulfate free initiator into a polymeric reactor, then adding the butadiene monomers in a percentage of 52-58 % into the polymeric reactor and stirring to homogeneously mix, increasing the temperature to 40-50 Deg. C, and in the press of 0.3-0.5 MPa, continuously adding the mixture in a percentage of acrylic nitrile of 30-45 %, unsaturated carboxylic acid of 0.5-8 % and unsaturated carboxylic ester of 0.5-7.5 % using a dosage pump, the adding time lasts 6-12 h, and reacting to 2-4 h, then stop, degassing in a degassing tank and second degassing in a degassing column, regulating the latex treated from the degassing column by PH regulating agents to get the completed product.

Description

1. Technical field [0001] The invention discloses a preparation method for producing carboxylated nitrile latex, in particular the process improvement of the continuous addition of highly active polymerized monomers in the reaction process and the removal of residual acrylonitrile monomers in products. 2. Background technology [0002] Compared with natural rubber latex, carboxylated nitrile latex has its unique advantages. Because of the introduction of carboxyl (-COOH) and nitrile (-CN), the dipped products made of carboxylated nitrile latex have excellent oil resistance, film-forming properties and The tensile strength and other properties have been greatly improved. At present, the production method of carboxylated nitrile latex in the world mainly adopts the emulsion polymerization method, and companies in countries and regions such as Taiwan Nandi, Japan Zeon, Germany Bayer, and the United States all adopt this method. Production. In addition to butadiene and acrylon...

Claims

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Application Information

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IPC IPC(8): C08F2/22C08F4/30C08F236/12
Inventor 王奇王宝玉邓云英
Owner DONGYING JIUZHOU AOHUA CHEM
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