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Method for synthesizing hydrogenated butadiene-acrylonitrile rubber by nano-Pd/C catalyst

A technology for hydrogenating nitrile butadiene rubber and nitrile butadiene rubber, which is applied in the field of fine chemicals, can solve the problems of harsh reaction conditions, incomplete conversion, and high cost of synthesizing hydrogenated nitrile butadiene rubber, and achieves the effect of mild reaction conditions and easy separation

Inactive Publication Date: 2013-05-01
CHENZHOU GAOXIN PLATINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventive method reacts directional and selectively hydrogenates C=C, but does not add hydrogen to C≡N, which overcomes the problems of high cost of synthesizing hydrogenated nitrile rubber, harsh reaction conditions, poor purity, low yield, incomplete conversion, etc.; Conciseness, efficiency, environmental protection and other characteristics

Method used

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  • Method for synthesizing hydrogenated butadiene-acrylonitrile rubber by nano-Pd/C catalyst
  • Method for synthesizing hydrogenated butadiene-acrylonitrile rubber by nano-Pd/C catalyst
  • Method for synthesizing hydrogenated butadiene-acrylonitrile rubber by nano-Pd/C catalyst

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Effect test

Embodiment 1

[0044] Accurately weigh 25 g NBR, 2.5 g 3wt% Pd / C catalyst prepared by CN 101966455 B patent, one or two solvents in 175g isopropanol, benzene, toluene, xylene, cyclohexane, tetrahydrofuran, add Put it into a 0.5L high-pressure reactor, first remove the air in the reactor, replace it with hydrogen repeatedly several times, stir and heat to 60°C, and fill it with hydrogen to 4MPa to react for 5 hours. After the reaction, filter, wash, and evaporate the solvent. The sample was analyzed by 1H NMR spectrum, and the hydrogenation rate of HNBR was 97.8%.

Embodiment 2

[0046]Accurately weigh 25 g NBR, 2.5 g 3wt% Pd / C catalyst prepared by CN 101966455 B patent, one or two solvents in 175 g isopropanol, benzene, toluene, xylene, cyclohexane, tetrahydrofuran, add Put it into a 0.5L high-pressure reactor, first remove the air in the reactor, replace it with hydrogen repeatedly several times, stir and heat to 60°C, and fill it with hydrogen to 4MPa to react for 6 hours. After the reaction, filter, wash, and evaporate the solvent. The sample was analyzed by 1H NMR spectrum, and the hydrogenation rate of HNBR was 98.5%.

Embodiment 3

[0048] Accurately weigh 25 g NBR, 2.5 g 3wt% Pd / C catalyst prepared by CN 101966455 B patent, one or two solvents in 175 g isopropanol, benzene, toluene, xylene, cyclohexane, tetrahydrofuran, add Put it into a 0.5L high-pressure reactor, first remove the air in the reactor, replace it with hydrogen repeatedly several times, stir and heat it to 70°C, and fill it with hydrogen to 4MPa for 5 hours. After the reaction, filter, wash, and evaporate the solvent. The sample was analyzed by 1H NMR spectrum, and the hydrogenation rate of HNBR was 98.8%.

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Abstract

The invention provides a method for synthesizing hydrogenated butadiene-acrylonitrile rubber (HNBR) by a nano-Pd / C catalyst. According to the invention, NBR (nitrile-butadiene rubber) is taken as a raw material, Pd / C (dihydroxy polyether / carbon) is taken as the catalyst, a solvent is added, and the HNBR is synthesized by performing catalytic hydrogenation in a high-pressure reaction kettle. According to the invention, the 3 wt% of Pd / C is adopted as the catalyst, and in the reaction, hydrogenation is performed for C and C joined by a double bond in orientation selection while being not performed for C and N joined by a triple bond, so that the problems of high cost, rigorous reaction conditions, poor purity, low yield, incomplete conversion and the like for synthesis of HNBR are radically solved; and the method is environment-friendly and efficient, the conversion rate is nearly 100%, and the hydrogenation rate reaches 99.5%.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a method for synthesizing hydrogenated nitrile rubber with a nanometer Pd / C catalyst. Background technique [0002] Hydrogenated nitrile rubber (HNBR) is a high-tech, high value-added new type of elastomer, which is obtained by selective hydrogenation of butadiene units on the chain segment of nitrile rubber (NBR), and it is irreplaceable Excellent performance, widely used in aerospace, oil field, automobile and other fields, such as seals for aerospace, shock absorbing materials, oil seals and transmission belts for automobiles, fuel system components, maintenance boxes for drilling and pistons for mud , Printing and textile rubber rollers, etc., its application field has broken through the traditional field of NBR, making chlorosulfonated polyethylene, chlorinated polyethylene and other special rubbers also subject to certain impact. The supply of domestic HNBR mainly...

Claims

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Application Information

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IPC IPC(8): C08F236/12C08F8/04B01J23/44
Inventor 雷婧杨拥军叶咏祥邓春玲舒涛杨静刘汉范
Owner CHENZHOU GAOXIN PLATINUM
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