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In-situ hydrogenation method of acrylonitrile-butadiene rubber latex

A technology of in-situ hydrogenation and nitrile rubber is applied in the field of in-situ hydrogenation of nitrile latex with imide, which can solve the problem of unstable imide concentration, unstable imide, and hydrogenation degree. low problems, to achieve the effect of good hydrogenation effect, good processing performance and low gel content

Inactive Publication Date: 2010-05-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

This method belongs to ex-situ hydrogenation, and the generated diimide needs to enter the hydrogenation reaction vessel from the decomposition reaction vessel before hydrogenation can be realized. During this period, the diimide is very unstable and is prone to side reactions with other substances, resulting in Unstable imide concentration entering the hydrogenation reaction vessel
Therefore, although this method solves the problem of product crosslinking, the degree of hydrogenation is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 25mL of nitrile latex and 20mL of hydrazine hydrate solution into the reaction vessel, and heat it to 30°C, then keep the temperature constant for 2h, start timing at the constant temperature, and add the aqueous solution of sodium periodate dropwise within 2h (6g of sodium periodate dissolved in 20mL of deionized water). The product can be dissolved in chloroform solvent after demulsification and drying, and the hydrogenation degree is measured to be 43.1%.

Embodiment 2

[0020] Add 5mL of nitrile latex and 20mL of hydrazine hydrate solution into the reaction vessel, heat it to 70°C, keep the temperature constant for 8 hours, start timing at the constant temperature, and add the aqueous solution of sodium periodate dropwise within 6 hours (dissolve 13g of sodium periodate in 40mL of deionized water). The product can be dissolved in chloroform solvent after being demulsified and dried, and the hydrogenation degree is measured to be 77.7%.

Embodiment 3

[0022] Add 4.5mL of nitrile latex and 20mL of hydrazine hydrate solution into the reaction vessel, and heat it to 45°C, keep the temperature constant for 6 hours, start timing at the constant temperature, and add the aqueous solution of sodium periodate dropwise within 6 hours (dissolve 4g of sodium periodate in 20mL of ionized water). The product can be dissolved in chloroform solvent after being demulsified and dried, and the hydrogenation degree is measured to be 84.4%.

[0023] The infrared spectrograms of the nitrile latex before and after hydrogenation among the above-mentioned three embodiments all have absorption peak at 2236cm-1 place, here is the absorption peak of CN group, and secondary amine does not appear, the absorption peak of primary amine, this illustrates The hydrogenation method of the invention can successfully carry out selective hydrogenation to NBR without affecting the CN group, and can effectively avoid the formation of gel at the same time.

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Abstract

The invention belongs to the field of hydrogenation of acrylonitrile-butadiene rubber latex. The hydrogenation of acrylonitrile-butadiene rubber latex is realized through the technical scheme as follows: the mixture of acrylonitrile-butadiene rubber latex and hydrazine hydrate is heated to 30 to 70 DEG C, and then constant temperature is kept for 2 to 8 h, and in the process with constant temperature, aqueous solution of sodium periodate is dripped into the mixture, the dripping rate is controlled, and the dripping is accomplished within 2 to 6 hours. The method has the advantages of simple process flow, low cost, less pollution, high hydrogenation rate, low cross linking level of the prepared hydrogenated acrylonitrile-butadiene rubber latex, and good processing property.

Description

technical field [0001] The invention belongs to the field of hydrogenation of nitrile rubber latex, and in particular relates to a method for in-situ hydrogenation of nitrile latex (NBR) by using imide formed by the reaction of a hydrazine derivative and sodium periodate. Background technique [0002] The hydrogenation of nitrile rubber is to selectively hydrogenate the butadiene chain segment, hydrogenate and saturate the double bonds on most of the butadiene chain segment, leaving only a small amount (1-5%) of 1,4 butadiene The double bond of the diene is used for cross-linking, and the CN group remains. [0003] Hydrogenated nitrile rubber not only inherits the oil resistance, solvent resistance and wear resistance of ordinary nitrile rubber, but also obtains the high temperature resistance, aging resistance, chemical medium corrosion resistance, high tensile strength and long-term compression permanent deformation bestowed by the high saturation structure. Small compreh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/02
Inventor 张立群王勋章岳冬梅史向科宁思敏
Owner BEIJING UNIV OF CHEM TECH
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