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Environment-friendly type terminating agent for styrene butadiene rubber emulsion polymerization and preparation method thereof

An emulsion polymerization and environment-friendly technology, applied in the field of environment-friendly terminator and preparation for SBR emulsion polymerization, can solve the problem that the terminator cannot be applied to emulsion-polymerized SBR, etc., and achieve the effect of scientific and reasonable technical solution, investment saving and excellent performance.

Active Publication Date: 2013-12-25
吉林市泷泽化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The EU's TRGS552 regulation has become a technical trade barrier for my country's rubber products industry to export to the EU, and traditional terminators can no longer be used in the production of emulsion-polymerized SBR.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] At room temperature, 4 grams of accelerator N-isopropylhydroxylamine sodium sulfate was formulated into a 1% aqueous solution; 20 grams of sodium benzhydryl dithiocarbamate was formulated into a 20% aqueous solution; 0.3 grams of disproportionated rosin Potassium acid potassium soap and 0.3 gram of fatty acid sodium soap are added for dissolving in 6 grams of water to prepare a dispersant solution, and the sodium benzhydryl dithiocarbamate solution is added under stirring, and after the solution is fully mixed, 400 grams of accelerator solution are added and continuously stirred After mixing evenly, add chemical stabilizers such as 1 gram of sodium polysulfide and 0.2 gram of sodium ascorbate, stir and mix evenly, and obtain a uniform, transparent and stable environment-friendly terminator for SBR emulsion polymerization.

[0015] Application test: Get 2500 grams of unterminated styrene-butadiene latex that reaches 60% conversion rate, its solid content is 20%, put int...

Embodiment 2

[0017] At room temperature, 0.2 gram of promotor N-isopropyl hydroxylamine sulfate is mixed with 1% aqueous solution; Two 20 grams of 4-chloro-benzyl dithiocarbamate sodium are mixed with concentration and are 20% aqueous solution; 0.3 gram of disproportionated abietic acid potassium soap and 0.3 gram of fatty acid sodium soap are added for dissolving in 20 grams of water to prepare a dispersant solution, add two 4-chloro-benzyl dithiocarbamate sodium solutions, stir until the solution is fully mixed, then add 10 1 gram of accelerator solution, stirred until uniformly mixed, then added chemical stabilizer 1 gram of sodium polysulfide and 0.2 gram of sodium ascorbate, continued to stir and mix uniformly to obtain a uniform, transparent and stable SBR emulsion polymerization environment-friendly terminator.

[0018] Application test: Get 2500 grams of unterminated styrene-butadiene latex that reaches 60% conversion rate, its solid content is 20%, put into closed steel kettle, a...

Embodiment 3

[0020] At room temperature, 2 grams of accelerator N-isopropylhydroxylamine potassium sulfate is formulated into a 1% aqueous solution for subsequent use; 20 grams of sodium diphenylethyl dithiocarbamate is formulated with a concentration of 20% aqueous solution for subsequent use.

[0021] Application test: Get the unterminated SBR latex 2500 grams that reaches 60% conversion rate, its solid content is 20%, puts into closed steel kettle, adds to the 30 gram accelerator solution that embodiment 3 makes from two places of adding inlet simultaneously respectively And 10 grams of sodium diphenylethyl dithiocarbamate solution, stirred for 10 minutes, degassed, condensed, and obtained 500 grams of environment-friendly SBR samples.

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PUM

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Abstract

The invention discloses an environment-friendly type terminating agent for SBR (Styrene Butadiene Rubber) emulsion polymerization, wherein a raw material expression of the terminating agent is disubstituted alkyl dithiocarbamate of R2NCS2M; in the formula, A is alkyl with C1-C3, R is A-C6H4Cl or R is A-C6H5, M is a sodium salt or a potassium salt; an accelerant is isopropyl hydroxylamine sulfate. The ratio of the raw material: the accelerant: a dispersing agent: a chemical stabilizer is equal to 100: (1-20): 3: 6. The preparation method of the environment-friendly type terminating agent comprises the following steps of: preparing the raw material into 10-20 wt% aqueous liquor in a kettle; preparing the dispersing agent into 3wt% aqueous solution, and adding into the kettle under the stirring condition, uniformly stirring, adding 1-20 wt% accelerant aqueous liquor, uniformly stirring, adding the solid chemical stabilizer according to the ratio, and continuously stirring uniformly to prepare the environment-friendly type terminating agent which is uniform, transparent and stable. The raw material, an accelerant ratio as well as liquor components in the scheme are the same as those in a scheme II.

Description

technical field [0001] The invention belongs to the field of polymer synthesis, and relates to an environment-friendly terminator for SBR emulsion polymerization and a preparation method. Background technique [0002] In styrene-butadiene rubber (SBR) emulsion polymerization, chain growth is usually terminated at a specified conversion to prevent the formation of polymer gels and to ensure the quality of the resulting polymer. In the prior art, most of the terminators used in the production of SBR by emulsion polymerization are composed of dimethyl dithiocarbamate, diethylhydroxylamine, and sodium nitrite. Diethylhydroxylamine and dimethyl dithiocarbamate are easy to form secondary amines in the acidic environment of latex gel, and the secondary amines react with nitrating reagents such as sodium nitrite and nitrogen oxides present in the air Formation of carcinogens - nitrosamines. EU countries have formulated EU chemical regulations TRGS552 to address this issue, and sti...

Claims

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Application Information

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IPC IPC(8): C08F236/10C08F2/42C08F2/22
Inventor 肖海波姚成
Owner 吉林市泷泽化工有限公司
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