Preparation method of high-stability carboxylic chloroprene rubber latex

A carboxyl neoprene latex, high stability technology, applied in the direction of carboxyl rubber adhesives, adhesives, adhesive types, etc., can solve the problem of high activity of chloroprene active groups, unfavorable ecological environment and public health, and easy Combustion and other problems, to solve the problem of mechanical stability and chemical stability, improve the poor stability of latex, improve the effect of stability

Active Publication Date: 2018-02-09
SHANNA SYNTHETIC RUBBER
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  • Abstract
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Problems solved by technology

[0005] The present invention solves the problem of poor stability of the carboxylated neoprene latex prepared by using traditional emulsifiers. At the same time, due to the high activity of chloroprene active groups, self-polymerization is very easy to occur. At the same time, most of the adhesives using neoprene rubber Belongs to direct solubility, it is highly toxic, flammable, pollutes the environment, and is extremely unfavorable to the ecological environment and public health. A method for preparing high-stability carboxychloroprene latex is provided. Chloroprene and unsaturated carboxylic acid Under the joint action of non-ionic and anionic emulsifiers, the second monomer of the class prepares carboxychloroprene latex. The latex has stable performance and is stable in acid, alkali, and salt environments. It has good storage stability and a storage stability period of up to 2 Years later, no sedimentation phenomenon occurred, and its pH value, solid content, and particle size did not change

Method used

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  • Preparation method of high-stability carboxylic chloroprene rubber latex
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  • Preparation method of high-stability carboxylic chloroprene rubber latex

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: a kind of preparation method of high stability carboxyl neoprene latex, comprises the steps:

[0025] (1) Preparation of oil phase: Dissolve 0.4 parts of chain transfer agent, 0.5 parts of nonionic emulsifier, and 0.2 parts of dispersant in 100 parts of chloroprene to prepare oil phase, wherein the HLB of the nonionic emulsifier is ≥ 9;

[0026] (2) Prepare the water phase: dissolve 1.5 parts of anionic emulsifier and 3 parts of nonionic emulsifier in 100 parts of soft water, and stir evenly;

[0027] (3) Polymerization reaction: Divide the oil phase into 2 parts on average, add 3 parts of the second monomer of unsaturated carboxylic acid to one part, then mix it with the water phase at a ratio of 1:2, and stir at 40°C Emulsify to form a stable emulsion system. After the emulsification is completed, add a free radical initiator and carry out polymerization reaction at 10°C. After 3 hours, add another oil phase dropwise. The dropping time is controlled with...

Embodiment 2

[0032] Embodiment 2: a kind of preparation method of high stability carboxyl neoprene latex, comprises the steps:

[0033] (1) Preparation of oil phase: Dissolve 0.4 parts of chain transfer agent, 1 part of nonionic emulsifier, and 0.2 parts of dispersant in 100 parts of chloroprene to prepare oil phase, wherein the HLB of the nonionic emulsifier is ≥ 9;

[0034] (2) Prepare the water phase: dissolve 1 part of anionic emulsifier and 3 parts of nonionic emulsifier in 100 parts of soft water, and stir evenly;

[0035] (3) Polymerization reaction: Divide the oil phase into 2 parts on average, add 3 parts of the second monomer of unsaturated carboxylic acid to one part, then mix it with the water phase at a ratio of 1:2, and stir at 43 °C Emulsify to form a stable emulsion system. After the emulsification is completed, add a free radical initiator and carry out polymerization reaction at 30°C. After 3 hours, add another oil phase dropwise. The dropping time is controlled within 1 ...

Embodiment 3

[0037] Embodiment 3: a kind of preparation method of high stability carboxyl neoprene latex, comprises the steps:

[0038] (1) Preparation of oil phase: Dissolve 0.4 parts of chain transfer agent, 1 part of nonionic emulsifier, and 1 part of dispersant in 100 parts of chloroprene to prepare oil phase, wherein the HLB of the nonionic emulsifier is ≥ 9;

[0039] (2) Prepare the water phase: dissolve 2 parts of anionic emulsifier and 3 parts of nonionic emulsifier in 100 parts of soft water, and stir evenly;

[0040] (3) Polymerization reaction: Divide the oil phase into 2 parts on average, add 3 parts of the second monomer of unsaturated carboxylic acid to one part, then mix it with the water phase at a ratio of 1:2, and stir at 45 °C Emulsify to form a stable emulsion system. After the emulsification is complete, add a free radical initiator and carry out polymerization reaction at 50°C. After 3 hours, add another oil phase dropwise. The dropping time is controlled within 1 hou...

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Abstract

The invention belongs to the technical field of preparation of neoprene rubber latex, and provides a preparation method of high-stability carboxylic chloroprene rubber latex, so that the problems thatduring preparation of the carboxylic chloroprene rubber latex by the traditional mode, the system has low stability, and the raw materials have high toxicity, are combustible, cause environmental pollution and are extremely unfavorable for public health are solved. The preparation method comprises the following steps: dissolving a chain transfer agent, a separating and self-emulsifying agent, a dispersing agent, an anionic emulsifying agent and chloroprene to prepare an oil phase; dissolving an anionic emulsifying agent and a nonionic emulsifier into soft water to prepare an aqueous phase; averagely dividing the oil phase into two parts; adding a second monomer of unsaturated carboxylic acid into one part, mixing the part and the aqueous phase to perform emulsification, and initiating polymerization reaction; dropwise adding the other part of oil phase, continuously performing reaction, and after the reaction, adding a stabilizer to terminate the reaction. The preparation method is stable in the polymerization process, and the stable carboxylic chloroprene rubber latex can be prepared, has excellent performance, can resist acid, alkali and calcium salt and has high mechanical stability and chemical stability.

Description

technical field [0001] The invention belongs to the technical field of chloroprene latex preparation, and in particular relates to a preparation method of high-stability carboxylated chloroprene latex. Background technique [0002] As an adhesive, chloroprene rubber is mainly directly soluble. Due to the existence of harmful factors such as high toxicity, flammability, and environmental pollution, its production and use will be restricted. Water-based neoprene latex is a powerful substitute for solvent-based adhesives because it does not contain organic solvents, is non-toxic, and has no pollution. At the same time, the development of water-based neoprene latex will represent the development direction of neoprene latex adhesives. [0003] Carboxylated chloroprene latex is mainly made of unsaturated carboxylic acid monomer as the second monomer and chloroprene through copolymerization, and a strong polar -COOH or group is introduced into the main chain of chloroprene to prepa...

Claims

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Application Information

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IPC IPC(8): C08F236/18C08F220/06C08F2/26C08F2/30C09J113/02
CPCC08F2/26C08F2/30C08F236/18C09J113/02C08F220/06
Inventor 张淑娟毛利军郭立平魏凯
Owner SHANNA SYNTHETIC RUBBER
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