Modified butadiene-acrylonitrile rubber with high strength and good repeatable processability and preparation method thereof

A technology of nitrile-butadiene rubber and repeated processing is applied in the field of modification research of nitrile-butadiene rubber, which can solve the problems of high density of composite materials, achieve high tensile strength, high tensile strength, and promote resource saving and environmental protection.

Inactive Publication Date: 2018-12-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to load enough metal salts to form a good coordination with the cyano group in nitrile rubber, a large amount of reinforcing filler is required. The improvement of the strength of nitrile rubber is largely due to the reinforcement of nano-reinforcing fillers. effect; but after adding a large amount of filler, the density of the composite material becomes larger

Method used

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  • Modified butadiene-acrylonitrile rubber with high strength and good repeatable processability and preparation method thereof
  • Modified butadiene-acrylonitrile rubber with high strength and good repeatable processability and preparation method thereof
  • Modified butadiene-acrylonitrile rubber with high strength and good repeatable processability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 (embodiment 1-4 difference is respectively 0.5%, 1%, 2%, 2.5% in the consumption of ferric chloride respectively)

[0038] The nitrile latex (butyronitrile content 33%) that will contain 100g dry glue is placed in the flask, adjust the solid content of nitrile latex with deionized water to be 20%, drop formic acid to adjust the latex pH to be equal to 3, slowly add mass concentration of Put 155 g of 30% hydrogen peroxide into the flask, and then react for 8 hours under magnetic stirring in a water bath at 40° C. to obtain epoxidized nitrile latex. figure 1 Infrared absorption spectra before and after epoxidation of nitrile latex, from figure 1 It can be seen that after the epoxidation modification of nitrile latex, epoxidized nitrile rubber (abbreviated as ENBR) is obtained;

[0039] Dilute epoxidized nitrile latex with deionized water to a solid content of 5%, then dropwise add ammonia water to adjust the latex pH to 7, then add Tris to make the latex pH ...

Embodiment 2

[0044] The nitrile latex (butyronitrile content 33%) that will contain 100g dry glue is placed in the flask, adjust the solid content of nitrile latex with deionized water to be 20%, drop formic acid to adjust the latex pH to be equal to 3, slowly add mass concentration of Put 155 g of 30% hydrogen peroxide into the flask, and then react for 8 hours under magnetic stirring in a water bath at 40° C. to obtain epoxidized nitrile latex.

[0045] Dilute the epoxidized nitrile latex (butyronitrile content 26%) to a solid content of 5% with deionized water, then add dropwise ammonia water to adjust the pH of the latex to 7, then add Tris to make the pH of the latex reach 8.5, then slowly add dopamine powder 10g, reacted at room temperature for 24h to obtain ENBR@DA latex.

[0046] Slowly add 1 g of anhydrous ferric chloride aqueous solution to ENBR@DA latex, react for 0.5 h under magnetic stirring at room temperature, and then filter with suction to obtain a solid product, and dry i...

Embodiment 3

[0049] The nitrile latex (butyronitrile content 33%) that will contain 100g dry glue is placed in the flask, adjust the solid content of nitrile latex with deionized water to be 20%, drop formic acid to adjust the latex pH to be equal to 3, slowly add mass concentration of Put 155 g of 30% hydrogen peroxide into the flask, and then react for 8 hours under magnetic stirring in a water bath at 40° C. to obtain epoxidized nitrile latex.

[0050] Dilute epoxidized nitrile latex with deionized water to a solid content of 5%, then dropwise add ammonia water to adjust the latex pH to 7, then add Tris to make the latex pH to 8.5, then slowly add 10 g of dopamine powder, and react at room temperature for 24 hours Get ENBR@DA latex.

[0051] Slowly add 2g of anhydrous ferric chloride aqueous solution to ENBR@DA latex, react for 0.5h under magnetic stirring at room temperature, and then filter with suction to obtain a solid product, and dry it in a 60°C blast drying oven to constant weig...

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Abstract

The invention discloses dopamine grafted epoxidized butadiene-acrylonitrile rubber with high strength and good repeatable processability and a preparation method thereof. A formula of the dopamine grafted epoxidized butadiene-acrylonitrile rubber comprises the raw material components in parts by mass: 100 parts of butadiene-acrylonitrile latex, 3-500 parts of an epoxidizer, 1-25 parts of dopamine,and 0.1-5 parts of anhydrous ferric trichloride; the epoxidizer is hydrogen peroxide or molybdenum trioxide. The preparation method comprises the steps: during preparation, carrying out epoxidation of nitrile-butadiene rubber firstly to obtain epoxidized butadiene-acrylonitrile rubber; adding dopamine, and carrying out grafting reaction; and after the reaction is completed, adding anhydrous ferric trichloride, drying, mixing, and carrying out hot pressing to obtain the dopamine grafted epoxidized butadiene-acrylonitrile rubber. The prepared modified butadiene-acrylonitrile rubber has high strength and good repeatable processability without filler reinforcement.

Description

technical field [0001] The invention relates to modification research of nitrile rubber, in particular to a modified nitrile rubber with high strength and good repeatability and a preparation method thereof. Background technique [0002] Nitrile-butadiene rubber (NBR) has strong polarity because of its acrylonitrile structure, and its heat resistance is better than most general-purpose rubbers. It has excellent oil resistance and non-polar solvent (alkane) resistance, good air tightness, and excellent antistatic performance. However, the strength of vulcanized nitrile rubber without reinforcing agent is very low and basically has no application value. The traditional method of reinforcing NBR is to add reinforcing agents, mainly including carbon black, silica, silicate, activated calcium carbonate and some organic compounds. In order to achieve a better reinforcing effect, the amount of reinforcing agent added is often large, and there are many problems in the process such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/22C08C19/06
CPCC08C19/22C08C19/06
Inventor 陈玉坤程珍珍曹黎明
Owner SOUTH CHINA UNIV OF TECH
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