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A kind of compression cold resistance special hydrogenated nitrile rubber and preparation method thereof

A technology of hydrogenated nitrile rubber and nitrile rubber is applied in the field of organic polymer materials to achieve the effects of improving compression cold resistance, improving oil resistance and low glass transition temperature

Active Publication Date: 2017-12-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As early as 1993, Susmita Bhattacharjee and others proposed to introduce epoxy groups into hydrogenated natural rubber to prevent natural rubber from forming a crystalline structure after rehydrogenation, but unfortunately, the molecular chain order of hydrogenated nitrile rubber is higher than that of hydrogenated Natural rubber, it is difficult to completely destroy its crystalline structure only by epoxy groups

Method used

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  • A kind of compression cold resistance special hydrogenated nitrile rubber and preparation method thereof
  • A kind of compression cold resistance special hydrogenated nitrile rubber and preparation method thereof
  • A kind of compression cold resistance special hydrogenated nitrile rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Dissolve nitrile rubber with acrylonitrile content of 19wt% in xylene to prepare a solution of nitrile rubber with a solution mass concentration of 8wt%. Take 300g of the above glue solution in a 500ml three-necked bottle, add 21.6g of acetic acid, and then add hydrogen peroxide solution dropwise, react and stir at 65°C for 10h to obtain a mixed solution. The reacted mixed solution is precipitated, washed and dried to obtain epoxidized nitrile rubber. Calculated by nuclear magnetic spectrum, the epoxy degree is E%=32%;

[0061] (2) epoxidized nitrile rubber is dissolved in xylene, is mixed with the solution that solution mass concentration is 5wt%; Get solution 100g and add in autoclave, add Wilkinson catalyst 0.04g, triphenylphosphine 0.12 g. Evacuate nitrogen and hydrogen from the reactor three times each, then feed hydrogen at 4MPa, heat to 110°C, and react at medium and low speeds at 500r / min for 8 hours to obtain an epoxidized hydrogenated nitrile rubber solu...

Embodiment 2

[0065] 6.52g propionic anhydride (C 6 h 10 o 3 ) instead of 7.59g butyric anhydride (C 8 h 14 o 3 ), and other conditions remain unchanged, the hydrogenated nitrile rubber of the grafted butyl ester group is obtained.

Embodiment 3

[0067] 6.52g propionic anhydride (C 6 h 10 o 3 ) instead of 11.17g valeric anhydride (C 10 h 18 o 3 ), and other conditions remain unchanged, the hydrogenated nitrile rubber of the grafted pentyl ester group is obtained.

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Abstract

The invention relates to compressing cold-tolerant special hydrogenated butyronitrile rubber and a preparation method thereof. A main chain of the rubber contains an epoxy group and a part of the epoxy group is connected with an ester side group; the ester side group is generated by ring-opening reaction of anhydride of C6-C24 and the epoxy group. The preparation method comprises the steps of introducing the epoxy group in the molecular main chain of the rubber so as to react part of the epoxy group with the anhydride under the action of a catalyst, and introducing the ester group to obtain the special hydrogenated butyronitrile rubber. According to the special hydrogenated butyronitrile rubber provided by the invention, the glass transition temperature is low, a crystallization area does not exist and the compressing cold-tolerant coefficient reaches 0.4, so that the special hydrogenated butyronitrile rubber is special rubber with excellent compressing cold-tolerant performance. The epoxy group and the ester group are introduced into the rubber, so that the compressing cold-tolerant performance is improved and excellent oil resistance is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of organic polymer materials, and in particular relates to a compression cold-resistant special hydrogenated nitrile rubber and a preparation method thereof. Background technique [0002] Hydrogenated nitrile rubber (HNBR) is an elastomer material with excellent comprehensive properties. It is obtained by hydrogenating the carbon-carbon double bonds in nitrile rubber (NBR). HNBR not only retains the original excellent oil resistance of NBR, but also hydrogenates Nitrile rubber (HNBR) has excellent high temperature resistance and aging resistance. However, the main chain structure of nitrile rubber after hydrogenation is composed of -CH 2 -CH 2 =CH 2 -CH 2 Converts to -CH in a more stackable arrangement 2 -CH 2 -CH 2 -CH 2 -Structure, the material forms a crystalline region, and the glass transition temperature (Tg) increases, which affects its performance in a low temperature environment. Moreover, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08C19/06C08C19/02C08C19/40
CPCC08C19/02C08C19/06C08C19/40
Inventor 岳冬梅蕫建军赵鑫张立群
Owner BEIJING UNIV OF CHEM TECH
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