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Method for preparing crosslinking butadiene-acrylonitrile copolymer rubber

A technology of butadiene and acrylonitrile, which is applied in the field of preparation of cross-linked butadiene-acrylonitrile copolymer rubber, can solve the problems of difficulty in controlling the degree of cross-linking and limitation of application fields, and achieves low product shrinkage and processing performance. improved effect

Active Publication Date: 2009-05-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymerization temperature of the former is usually between 30 and 60°C, and the conversion rate is above 80%, but it is difficult to control the degree of crosslinking by this method; the polymerization temperature of the latter is usually between 5 and 30°C, and the degree of crosslinking can be controlled by the crosslinking agent. The type or (and) the amount added to control
Due to the different cross-linking forms of the two, there are also large differences in molecular structure, and their application fields are limited.

Method used

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  • Method for preparing crosslinking butadiene-acrylonitrile copolymer rubber
  • Method for preparing crosslinking butadiene-acrylonitrile copolymer rubber

Examples

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Effect test

Embodiment 1

[0037] In a reactor with a mixer and a capacity of 30L, add 65 parts of butadiene, 35 parts of acrylonitrile, 0.1 part of 1-tris(3-methacrylate) propane, 0.5 parts of dodecyl The complex soap of the sodium benzenesulfonate and the potassium oleate of 2.5 parts, the tert-dodecyl mercaptan of 0.5 part, 0.3 part of potassium persulfate, 0.02 part of triethanolamine, 100 parts of water, carry out emulsion polymerization at 25 ℃, When the conversion rate reaches 40-45%, add 0.1 part of 1-tris(3-methacrylate) propane, when the conversion rate reaches 70-75%, heat up to 40°C to maintain the polymerization reaction, the conversion rate is 90- 97% add a terminator to terminate the polymerization reaction. Obtained polymer bound acrylonitrile 32.8%, Mooney viscosity 71, structure gel 53.2%, shrinkage: 27.8%

Embodiment 2

[0039] In a reactor with a mixer and a capacity of 30L, add 62 parts of butadiene, 38 parts of acrylonitrile, 0.1 part of dimethyl (acrylate) glycol ester, and 1.0 part of dodecylbenzenesulfonate The complex soap of sodium stearate and 2.0 parts of potassium stearate, 0.5 parts of tert-dodecyl mercaptan, 0.3 parts of potassium persulfate, 0.02 parts of triethanolamine, 100 parts of water, carry out emulsion polymerization at 15 ° C, when conversion When the conversion rate reaches 35-40%, add 0.1 part of dimethyl (acrylate) glycol ester. When the conversion rate reaches 70-75%, raise the temperature to 50°C to maintain the polymerization reaction, and the conversion rate is 90-97%. agent to terminate the polymerization reaction. Obtained polymer bound acrylonitrile 35.2%, Mooney viscosity 76, structure gel 63.7%, shrinkage: 23.6%

Embodiment 3

[0041] In a reactor with a mixer and a capacity of 30L, add 74 parts of butadiene, 26 parts of acrylonitrile, 0.2 parts of dimethyl (acrylate) glycol ester, and 1.5 parts of sodium lauryl sulfate And 2.0 parts of potassium oleate complex soap, 0.5 parts of tert-dodecyl mercaptan, 0.3 parts of potassium persulfate, 0.02 parts of dimethylamine, 100 parts of water, carry out emulsion polymerization at 15 ° C, when the conversion When it reaches 30-35%, add 0.1 part of dimethyl (acrylate) glycol ester, when the conversion rate reaches 50-55%, add 0.1 part of dimethyl (acrylate) glycol ester, when When the conversion rate reaches 70-75%, the temperature is raised to 45°C to maintain the polymerization reaction, and when the conversion rate is 90-97%, a terminator is added to terminate the polymerization reaction. Obtained polymer bound acrylonitrile 25.4%, Mooney viscosity 68, structure gel 88.5%, shrinkage: 21.7%

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Abstract

The invention relates to a method for preparing cross-linking type butadiene-acrylonitrile copolymerizing rubber, which is characterized in that a butadiene monomer and an acrylonitrile monomer are mixed; 0.05 to 3.0 portions of cross-linking agent based on the mass portion of the total monomers is added into the mixture by two times or more than two times; 0.8 to 5.0 portions of emulsifying agents of alkyl sulfates of C8 to C16 or alkylbenzene sulfonates, a molecular weight regulator, a persulfate initiator, an activating agent, desalted water and so on are added into the mixture to finish polyreaction at a temperature of between 10 and 50 DEG C; and the polyreaction is finished when the monomer conversion is between 90 and 97 percent. The method for preparing the cross-linking type butadiene-acrylonitrile copolymerizing rubber is adopted to obtain butadiene-acrylonitrile copolymerizing rubber with the structural gel content of between 30 and 90 percent. The processability of the obtained polymer is improved, and the shrinkability of products is small (the shrinkage ratio is below 30 percent).

Description

technical field [0001] The invention relates to a preparation method of butadiene-acrylonitrile copolymer rubber, in particular to a preparation method of cross-linked butadiene-acrylonitrile copolymer rubber. Background technique [0002] At present, the method used in the industrial production of butadiene-acrylonitrile rubber (NBR) is mostly emulsion polymerization. NBR emulsion polymerization has two types: high-temperature emulsion polymerization (30-50°C) and low-temperature solution polymerization. Most manufacturers in the world, such as Bayer, American Goodrich, Japan Zeon and JSR, all use low-temperature emulsion polymerization. [0003] The general process of producing NBR by the emulsion method is: before polymerization, the monomer and various additives are prepared according to the polymerization formula, then the materials are put into the polymerization kettle, and the initiator is added to carry out the polymerization reaction, and then the regulator is adde...

Claims

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Application Information

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IPC IPC(8): C08F236/06C08F2/24C08F220/44
Inventor 于奎荔栓红梁滔龚光碧李树毅张志强桂强唐明安周雷
Owner PETROCHINA CO LTD
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