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Nitrile rubber and production method for same

一种腈橡胶、腈单体的技术，应用在腈橡胶及其制备领域，能够解决腈橡胶差加工性、缓慢硫化速率等问题，达到改善聚合速率和加工速率、高交联密度、优异聚合速率的效果

Active Publication Date: 2015-04-08
LG CHEM LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low content of nitrile rubber shows poor processability and slow vulcanization rate

Method used

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  • Nitrile rubber and production method for same
  • Nitrile rubber and production method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055]

[0056] 78 parts by weight of 1,4-butadiene, 22 parts by weight of acrylonitrile, 3 parts by weight of oleic acid as a fatty acid, 0.45 parts by weight of 2,2,4,6,6- Pentamethylheptane-4-thiol, 0.05 parts by weight of p-menthane hydroperoxide as an oil-soluble peroxide, and 200 parts by weight of water were emulsion-polymerized to prepare a nitrile rubber latex.

[0057] Specifically, 12 parts by weight of acrylonitrile was added before polymerization initiation, and the remainder was added in three equal portions. Specifically, 3.33 parts by weight of acrylonitrile was added at 2 hours, 4 hours and 6 hours after the initiation of the polymerization.

[0058] The polymerization reaction was terminated when the conversion rate in which the amount of monomer converted into polymer was confirmed by measuring the amount of total solids was 80% and the total reaction time was 8 hours in total. The amount of acrylonitrile for each conversion is shown in figure 1 middle. ...

Embodiment 2

[0062]

[0063] Except that 12 parts by weight of acrylonitrile was added in the early stage of polymerization, the rest of acrylonitrile was added in four aliquots of 2.5 parts by weight (i.e. at 2 hours, 3.5 hours, 5 hours and 6.5 hours after polymerization), Example 2 was carried out in the same manner as Example 1. Here, the total time taken to reach a polymerization conversion of 80% was a total of 8 hours.

Embodiment 3

[0065]

[0066] In the same manner as in Example 1, except that 12 parts by weight of acrylonitrile was added in the early stage of the polymerization, and the rest of the acrylonitrile was added in equal parts of 5 parts by weight twice (ie, at 2.5 hours and 5 hours after the polymerization) way to implement Example 3. Here, the total time taken to reach a polymerization conversion of 80% was a total of 7 hours.

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Abstract

The present invention relates to a nitrile rubber and a preparation method thereof, and more specifically, to a nitrile rubber which has low nitrile content, contributes excellent polymerization rate and vulcanization rate, and has excellent processability in vulcanization, and to a preparation method thereof. To this end, provided is a nitrile rubber comprising 18 to 32 parts by weight of one or more types of α,β-unsaturated nitrile monomers and 68 to 82 parts by weight of one or more types of conjugated diene monomers based on 100 parts by weight of the nitrile rubber, wherein ΔACN is less than or equal to 3.

Description

technical field [0001] The invention relates to a nitrile rubber and a preparation method thereof. More specifically, the present invention relates to nitrile rubbers having excellent polymerization rates and vulcanization rates and favorable processability during vulcanization, and methods for their preparation. Background technique [0002] In general terms, nitrile rubber is a copolymer of acrylonitrile and butadiene, wherein the combined amount of acrylonitrile is 15 to 50%, and acrylonitrile and butadiene are randomly copolymerized. [0003] The main advantage of nitrile rubber is excellent oil resistance due to the polarity of the nitrile groups in acrylonitrile. The properties are strongly dependent on the amount of nitrile bound. In the relationship between the amount of bound nitrile and swelling, and at the aniline point of the oil (the lowest temperature at which the hydrocarbon is completely dissolved in aniline having the same volume as the hydrocarbon volume,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/12C08L9/02
CPCC08F236/12C08K5/09C08K5/14C08K5/37Y10T428/139
Inventor 李世恩柳东雕韩善姬安贞宪全喜晶赵正训
Owner LG CHEM LTD
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