Hydrogenation method for organic catalyst normal-pressure catalytic butyronitrile rubber latex

A technology for catalyzing nitrile and organic catalysts at atmospheric pressure, which is applied in the field of in-situ hydrogenation of nitrile latex at atmospheric pressure, which can solve problems such as affecting performance and difficult removal, achieve stable chemical properties, save reaction raw materials, and reduce costs Effect

Active Publication Date: 2012-12-19
BEIJING UNIV OF CHEM TECH
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  • Application Information

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Problems solved by technology

The work done by the predecessors used inorganic catalysts, such as copper sulfate, ferric sulfate, ferrous sulfate or boric acid. After the hydrogenation reaction is completed, the inorganic catalysts will remain in the rubber system and are difficult to remove. Therefore, during the long-term use of rubber will affect its performance,

Method used

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  • Hydrogenation method for organic catalyst normal-pressure catalytic butyronitrile rubber latex
  • Hydrogenation method for organic catalyst normal-pressure catalytic butyronitrile rubber latex
  • Hydrogenation method for organic catalyst normal-pressure catalytic butyronitrile rubber latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 100 mL of nitrile latex (34% acrylonitrile content) to a three-neck round-bottomed flask, raise the reaction temperature to 70 °C, and then add 15 mL of hydrazine hydrate (the molar ratio of hydrazine hydrate to carbon-carbon double bond is 10.0). The add-on of flavin catalyst is respectively 0.2g, 0.4g, 0.6g, under the condition of air existence, reacts 12 h, the hydrogenated nitrile latex obtained with CaCl 2 The aqueous solution was demulsified, dried, and its hydrogenation degree was calculated by measuring the infrared spectrum. The results of the hydrogenation degree are shown in Table 1.

[0023] Table 1 The effect of the amount of riboflavin catalyst added on the degree of hydrogenation

[0024]

Embodiment 2

[0026] Other conditions are the same as in Example 1, using 0.4 g of riboflavin catalyst, changing the molar ratios of hydrazine hydrate and carbon-carbon double bonds to 5.2, 10.0, 15.5, 20.6 respectively, and the hydrogenation degree results are shown in Table 2.

[0027] Table 2 Effect of the molar ratio of hydrazine hydrate to carbon-carbon double bond on the degree of hydrogenation

[0028]

Embodiment 3

[0030] Other conditions are the same as in Example 1, using 0.4 g of riboflavin catalyst, changing the reaction temperature to 50° C., 70° C., and 80° C., and the hydrogenation degree results are shown in Table 3.

[0031] Table 3 Effect of reaction temperature on degree of hydrogenation

[0032]

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Abstract

The invention provides a hydrogenation method for organic catalyst normal-pressure catalytic butyronitrile rubber latex, belonging to the field of the in-situ normal-pressure hydrogenation of the butyronitrile rubber latex. The invention provides a novel method for carrying out the hydrogenation research on the macromolecule butyronitrile rubber latex by a hydrazine hydrate / riboflavin catalyst system under the air condition, and developing the in-situ hydrogenation of the green organic compounds--riboflavin catalyst on the butyronitrile rubber latex, wherein the riboflavin catalyst is firstly used in an aqueous dispersion rubber latex system. Compared with the existing inorganic catalyst such as the copper sulfate, the ferric sulfate, the ferrous sulfate or the boric acid, the riboflavin organic catalyst has the advantages that the riboflavin organic catalyst is green and environment-friendly, and is easy to prepare, the latex can not be broken, the stability of the butyronitrile rubber latex can not be influenced due to the stable existence of the riboflavin organic catalyst and the rubber latex and the like, furthermore, a hydrogenated intermediate generated by a hydrazine hydrate / riboflavin catalyst system is stable, so that the hydrogenated butyronitrile rubber latex of which the hydrogenation degree is larger than 90% can be obtained.

Description

technical field [0001] The invention belongs to the field of in-situ normal pressure hydrogenation of nitrile latex, and selectively hydrogenates carbon-carbon double bonds in the molecular chain of nitrile rubber in the presence of a riboflavin catalyst. Background technique [0002] The molecular chain of nitrile rubber contains a large number of unsaturated carbon-carbon double bonds, which makes its chemical properties more active, resulting in poor ozone resistance and heat resistance, thus limiting the scope of use of nitrile rubber. Hydrogenated nitrile rubber is obtained by selective hydrogenation of carbon-carbon double bonds through hydrogenation reaction. Hydrogenated nitrile rubber not only maintains the good oil resistance and solvent resistance of nitrile rubber, but also improves its heat resistance , aging resistance, and oxygen resistance, thereby prolonging the service life of rubber products, meeting the requirements of special fields, and expanding the ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/02
Inventor 岳冬梅孟红伟张立群王勋章韩杨
Owner BEIJING UNIV OF CHEM TECH
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