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Hydrogenation method of acryionitrile-butadiene-rubber latex

A technology of nitrile rubber and hydrogenation reaction, which is applied in the field of direct hydrogenation of nitrile latex by using hydrazine derivatives, can solve problems such as damage and mechanical property degradation, reduce pollution, improve processing performance and mechanical properties, and react The effect of low temperature

Inactive Publication Date: 2010-06-02
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties of the vulcanized rubber obtained by this method are still far behind those of the traditional solution hydrovulcanized rubber. The reason may be that the molecular chain of HNBR is destroyed during the high temperature melting process, resulting in a decline in mechanical properties.

Method used

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  • Hydrogenation method of acryionitrile-butadiene-rubber latex
  • Hydrogenation method of acryionitrile-butadiene-rubber latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Add 75ml of xylene into the three-necked bottle 1, extend the end A of the conduit 3 into the three-necked bottle 1, and place it above the liquid level;

[0032] 2) Add 25mL of nitrile latex into the there-necked bottle 2, and add a PTFE rotor, and extend the B end of the conduit 3 below the surface of the nitrile latex;

[0033] 3) Heat the three-necked bottle 1 and the three-necked bottle 2 at the same time. After the three-necked bottle 1 is heated to 130°C and the three-necked bottle 2 is heated to 50°C, react at a constant temperature for 8 hours. During the constant temperature period, add 4g of Toluenesulfonylhydrazide, the total addition of p-toluenesulfonylhydrazide is 32g, and finally the product hydrogenated nitrile latex is obtained.

[0034] The product can be dissolved in chloroform solvent after being demulsified and dried, and the hydrogenation degree is measured to be 35%.

Embodiment 2

[0036] 1) Add 75ml of xylene into the three-necked bottle 1, extend the end A of the conduit 3 into the three-necked bottle 1, and place it above the liquid level;

[0037] 2) Add 25mL of nitrile latex into the there-necked bottle 2, and add a PTFE rotor, and extend the B end of the conduit 3 below the surface of the nitrile latex;

[0038] 3) Heat the three-necked bottle 1 and the three-necked bottle 2 at the same time, after the three-necked bottle 1 is heated to 145°C and the three-necked bottle 2 is heated to 70°C, react at a constant temperature for 48 hours. During the constant temperature period, add 3 g of Toluenesulfonyl hydrazide, the total addition of p-toluenesulfonyl hydrazide is 144g, finally obtains the product hydrogenated nitrile latex.

[0039] The product can be dissolved in chloroform solvent after being demulsified and dried, and the hydrogenation degree is measured to be 39%.

Embodiment 3

[0041] 1) Add 75ml of xylene into the three-necked bottle 1, extend the end A of the conduit 3 into the three-necked bottle 1, and place it above the liquid level;

[0042] 2) Add 25mL of nitrile latex into the there-necked bottle 2, and add a PTFE rotor, and extend the B end of the conduit 3 below the surface of the nitrile latex;

[0043]3) Heat the three-necked bottle 1 and the three-necked bottle 2 at the same time, after the three-necked bottle 1 is heated to 135°C and the three-necked bottle 2 is heated to 60°C, react at a constant temperature for 12 hours. During the constant temperature period, add 3 g of Toluenesulfonyl hydrazide, the total addition of p-toluenesulfonyl hydrazide is 36g, finally the product hydrogenated nitrile latex is obtained.

[0044] The product can be dissolved in chloroform solvent after being demulsified and dried, and the hydrogenation degree is measured to be 65%.

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Abstract

A hydrogenation method of nitrile latex belongs to the hydrogenation field of nitrile rubber latex. The disadvantages of the existing hydrogenation method of nitrile latex are that the cost is high and hydrogenated products generate cross bonding. The hydrogenation method of nitrile latex realizes hydrogenation through following technical scheme, respectively adding organic solvent and nitrile latex in two communicated reaction vessels and heating, when the temperature of the organic solvent reaching 130 to 145 DEG C and the temperature of the nitrile latex reaching 50 to 70 DEG C, keeping thetemperature constant for 4 to 48h, adding the derivative of hydrazine in the organic solvent in batches during the temperature constant period. The total amount of the added derivative of hydrazine is 1 to 3 times of the mole number of the carbon-carbon double bond in the hydrogenated nitrile latex. The method of the invention has the advantages of low cost and little pollution. The prepared hydrogenated nitrile latex has the advantages of low degree of cross linking and good processing property.

Description

technical field [0001] The invention belongs to the field of hydrogenation of nitrile rubber latex, in particular to a method for directly hydrogenating nitrile latex (NBR) by utilizing a hydrazine derivative. 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 inherits the oil resistance, solvent resistance and wear resistance of ordinary nitrile rubber, and 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. comprehensive performance. Therefore, it can meet the new and harsh requirements of oil f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08C19/02
Inventor 岳冬梅张立群桑海涛翁晶晶宁思敏余婷
Owner BEIJING UNIV OF CHEM TECH
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