Catalytic hydrogenation method of nitrile rubber

A technology of nitrile rubber and nitrile rubber, which is applied in the field of polymer hydrogenation modification, can solve the problems of increasing the cost of hydrogenated nitrile rubber, achieve efficient catalytic hydrogenation, improve catalytic activity, and reduce production costs

Active Publication Date: 2021-09-24
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent US Patent 6646059 discloses a method of utilizing ion exchange resin to adsorb and recover catalysts, however, the use of precious metals inevitably increases the cost of hydrogenated nitrile rubber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 A kind of catalytic hydrogenation method of nitrile rubber:

[0029] Add 5 wt% nitrile rubber solution into 50mL autoclave, add 1mg Fe 3 (CO) 12 With 10 mg propylene oxide, stir well at room temperature. Fill the autoclave with 1MPa nitrogen to replace the air in the autoclave, and repeat 3 times. Afterwards, hydrogen gas was charged into the autoclave at a pressure of 5 MPa, the reaction temperature was controlled to be 140°C by heating, and the reaction time was continuously stirred for 24 hours. After reaching the reaction time, cool the above-mentioned autoclave to room temperature, slowly open the vent valve, reduce the pressure to normal pressure, open the autoclave, and take out the reaction mixture. Add the poor solvent n-hexane, settle to obtain the target product, and the iodine value of the product is 22. The iodine value of the raw material of nitrile rubber is 305, that is, the degree of hydrogenation of hydrogenated nitrile rubber is 93%. ...

Embodiment 2

[0035] Embodiment 2 A kind of catalytic hydrogenation method of nitrile rubber:

[0036] Add 10 wt% nitrile rubber solution to a 250mL autoclave, add 1mL containing 0.1mg Fe 3 (CO) 12 Chlorobenzene solution and 10mg propylene oxide, stir well. Fill the autoclave with 1MPa nitrogen to replace the air in the autoclave, and repeat 3 times. Then fill the high-pressure reactor with hydrogen gas at a pressure of 10 MPa, heat to control the reaction temperature at 190° C., and continuously stir for a reaction time of 96 hours. After reaching the reaction time, cool the above-mentioned autoclave to room temperature, slowly open the vent valve, reduce the pressure to normal pressure, open the autoclave, and take out the reaction mixture. Add poor solvent n-hexane, settling to obtain the target product, the iodine value of the product is 215. The iodine value of the raw material of nitrile rubber is 305, that is, the degree of hydrogenation of hydrogenated nitrile rubber is 29.5%. ...

Embodiment 3

[0038] Embodiment 3 A kind of catalytic hydrogenation method of nitrile rubber:

[0039] Add 1 wt% nitrile rubber solution into 250mL autoclave, add 10mg Fe 3 (CO) 12 With 100mg propylene oxide, stir well. Fill the autoclave with 1MPa nitrogen to replace the air in the autoclave, and repeat 3 times. Then fill the high pressure reactor with hydrogen gas at a pressure of 1 MPa, heat to control the reaction temperature to 30° C., and continuously stir for a reaction time of 1 h. After reaching the reaction time, cool the above-mentioned autoclave to room temperature, slowly open the vent valve, reduce the pressure to normal pressure, open the autoclave, and take out the reaction mixture. Add poor solvent n-hexane, settling to obtain the target product, the iodine value of the product is 250. The iodine value of the raw material of nitrile rubber is 305, that is, the degree of hydrogenation of hydrogenated nitrile rubber is 18%.

[0040] Among them: 1 wt% nitrile rubber solut...

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PUM

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Abstract

The present invention relates to a catalytic hydrogenation method of nitrile rubber, which comprises the steps of: adding a carbonyl metal compound and an epoxy compound to a nitrile rubber solution with a concentration of 1-30 wt%, and carrying out a reaction in a hydrogen atmosphere to obtain hydrogenated nitrile rubber. The carbonyl metal compound and the epoxy compound react to generate active alkyl metal species, and unsaturated C = C double bonds in the nitrile rubber solution are hydrogenated to generate saturated C-C bonds under the hydrogen reaction condition, so that the catalytic activity of a metal catalyst is obviously improved, efficient catalytic hydrogenation of the unsaturated C = C double bonds is realized, and meanwhile, the cost is effectively reduced.

Description

technical field [0001] The invention relates to the field of polymer hydrogenation modification, in particular to a catalytic hydrogenation method for nitrile rubber. Background technique [0002] Nitrile rubber, abbreviated as "NBR", refers to a copolymer or terpolymer of at least one α,β-unsaturated nitrile, at least one conjugated diene, and one or more additional copolymerizable monomers Objects of rubber. [0003] Hydrogenated NBR, also referred to as "HNBR" for short, is obtained by the selective hydrogenation of carbon-carbon double bonds in polymers of dienes in "NBR" without affecting the nitrile groups in these polymer chains Yes, but the hydrogenation of the nitrile group will promote the crosslinking of the polymer and reduce the processability of the elastomer. [0004] Hydrogenated nitrile rubber is a product obtained by hydrogenation and saturation of C=C double bonds in the molecular chain of nitrile rubber. Hydrogenated nitrile rubber has good oil resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/02
CPCC08C19/02
Inventor 李跃辉邓理赵娇娇陈娜娜摆建飞李晨李莹
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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