Preparation method of carboxylic acrylonitrile butadiene rubber latex containing vinyl chloride structure

The technology of carboxyl nitrile latex and vinyl chloride is applied in the field of preparation of carboxyl nitrile latex, which can solve the problem of not being able to release in time, and achieve the effects of less residual monomers, complete conversion, and improved chemical resistance.

Inactive Publication Date: 2017-06-13
安庆华兰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the production of latex for gloves with special performance requirements, the corresponding brand latex products have not been issued in time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] A preparation method of carboxylated nitrile latex containing vinyl chloride structure, comprising the following steps:

[0018] (1) The synthesis of latex, add deionized water, electrolyte, pH buffering agent, mercaptan, emulsifier, acrylonitrile, unsaturated carboxylic acid, unsaturated carboxylic acid ester, initiator successively according to weight part, fill nitrogen and vacuumize, Repeat three times, add butadiene and vinyl chloride, start to heat up to 30-40°C, react for 6-8 hours, add emulsifier and mercaptan, continue to heat up to 45-60°C, react for 6-8 hours, when the conversion When the rate reaches 95%, add an oil-soluble initiator, continue the reaction for 1 to 2 hours, and stop the reaction;

[0019] (2) Latex degassing and post-treatment, add deionized water to the polymerized latex first, dilute the latex to a total solid content of 39-41%, start to pass through the degassing tower, the latex enters from the top of the tower, and steam is introduced f...

Embodiment 1

[0021] A preparation method of carboxylated nitrile latex containing vinyl chloride structure, comprising the following steps:

[0022] (1) The synthesis of latex, first vacuumizes the polymerization kettle, drops into 120 parts of deionized water successively, 0.4 part of electrolyte, 0.2 part of pH buffering agent, 3.0 parts of emulsifier, 30 parts of acrylonitrile, 5 parts of unsaturated carboxylic acid, unsaturated carboxylic acid 2 parts of saturated carboxylate, 0.6 part of mercaptan, and 0.3 part of initiator. Fill nitrogen and vacuumize repeatedly three times, add 60 parts of butadiene, 3 parts of vinyl chloride, start to heat up to 30-40 °C, react for 6-8 hours, add 0.3 parts of emulsifier and 0.2 parts of mercaptan; continue to heat up to 45-40 °C At 60°C, react for 6-8 hours. When the conversion rate reaches 95%, add 0.05 part of oil-soluble initiator, continue the reaction for 1-2 hours, and stop the reaction.

[0023] (2) Latex degassing and post-treatment, add d...

Embodiment 2

[0025] A preparation method of carboxylated nitrile latex containing vinyl chloride structure, comprising the following steps:

[0026] (1) The synthesis of latex, first vacuumizes the polymerization kettle, drops into 120 parts of deionized water successively, 0.4 part of electrolyte, 0.2 part of pH buffering agent, 3.0 parts of emulsifier, 27 parts of acrylonitrile, 5 parts of unsaturated carboxylic acid, unsaturated carboxylic acid 2 parts of saturated carboxylate, 0.6 part of mercaptan, and 0.3 part of initiator. Fill nitrogen and vacuumize repeatedly three times, add 60 parts of butadiene and 6 parts of vinyl chloride, start to heat up to 30-40°C, react for 6-8 hours, add 0.3 parts of emulsifier and 0.2 parts of mercaptan; continue to heat up to 45-40 °C At 60°C, react for 6-8 hours. When the conversion rate reaches 95%, add 0.05 part of oil-soluble initiator, continue the reaction for 1-2 hours, and stop the reaction.

[0027] (2) latex degassing and aftertreatment, wit...

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PUM

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Abstract

The present invention provides a kind of preparation method of the carboxyl nitrile latex of vinyl chloride structure, comprises the following steps: (1) the synthesis of latex, add deionized water, electrolyte, pH buffering agent, mercaptan, emulsifier, Acrylonitrile, unsaturated carboxylic acid, unsaturated carboxylic acid ester, initiator, nitrogen filling and vacuuming, repeated three times, adding butadiene and vinyl chloride; (2) latex degassing and aftertreatment, the present invention adopts multiple chemical copolymerization reaction to form a four- or five-polymer copolymer containing vinyl chloride structural units; by adding an oil-soluble initiator in the later stage of the polymerization reaction, the polymerization reaction is more complete and the residual monomer is less; the introduction of vinyl chloride into the polymer chain Monomer, the wear resistance, tensile strength and chemical resistance of its products have been significantly improved.

Description

technical field [0001] The invention relates to the technical field of preparation methods of modified carboxylated nitrile latex, in particular to a preparation method of carboxylated nitrile latex containing vinyl chloride structure. Background technique [0002] Carboxylated nitrile latex is a kind of polymer white emulsion mainly composed of acrylonitrile, butadiene, methacrylic acid and other additives through emulsion polymerization. Due to its good film-forming properties, tensile strength and elongation at break, the emulsion is mainly used in the fields of making medical examination gloves, industrial gloves and household gloves. At present, the annual demand for carboxyl latex is more than 1 million tons, and most of the production capacity is concentrated in foreign Southeast Asian countries. The domestic import of medium and high-grade latex reaches more than 100,000 tons every year. In China, among the industrialized products of carboxylated nitrile latex, they...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/12C08F220/46C08F220/00C08F214/06C08F220/10C08F2/24
CPCC08F236/12C08F2/24C08F220/46C08F220/00C08F214/06C08F220/10
Inventor 徐国亮韩晓峰许桂刘江刘奎张森吕飚
Owner 安庆华兰科技有限公司
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