Nitrile rubber selective heterogeneous hydrogenation catalyst and preparation method and hydrogenation method thereof

Abstract

The invention provides a nitrile rubber selective heterogeneous hydrogenation catalyst and a preparation method and a hydrogenation method thereof. The nitrile rubber selective heterogeneous hydrogenation catalyst uses silicon dioxide hollow microspheres with rich big holes as carriers, and uses active metal M as carriers; through being metered by using the total quantity of the nitrile rubber selective heterogeneous hydrogenation catalyst as 100 weight percent, the load quantity of the active metal M is 1 weight percent to 8 weight percent; the active metal M comprises Pd or Rh. The catalyst is obtained by loading the active metal M onto the silicon dioxide hollow microspheres with rich big holes by a coupling grafting method. The method of the nitrile rubber selective heterogeneous hydrogenation completed by using the catalyst comprises the step of mixing the nitrile rubber selective heterogeneous hydrogenation catalyst and nitrile rubber. The invention also provides hydrogenation nitrile rubber obtained by the method. The nitrile rubber selective heterogeneous hydrogenation method completed by using the catalyst and provided by the invention has the advantages that the hydrogenation degree is high; the selectivity is 100 percent.

Description

technical field [0001] The invention relates to a selective heterogeneous hydrogenation catalyst for nitrile rubber, a preparation method thereof, a hydrogenation method using the catalyst and obtained hydrogenated nitrile rubber, belonging to the technical field of material preparation. Background technique [0002] Nitrile rubber (NBR) is prepared by emulsion copolymerization of butadiene and acrylonitrile. It has polar nitrile groups in its molecular chain, and has oil resistance, heat resistance, good processing performance and wear resistance. However, due to the large number of carbon-carbon double bonds in the NBR molecular chain, the heat resistance and oxygen resistance are poor, so its application range is limited. By selectively hydrogenating the double bonds in NBR, the heat resistance, oxygen resistance, and aging resistance of the rubber can be greatly improved on the basis of retaining the original properties of NBR. It has excellent mechanical properties suc...

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Problems solved by technology

Although the use of macroporous catalysts can solve the impact of mass transfer and diffusion, compared with homogeneous catalysts, there are still shortcomings of too long reaction time and too harsh reaction conditions.

[0009] Because the specific surface area of ​​the catalyst is inevitably lost by the use of macroporous catalysts, and the preparation of supported catalysts still relies on the traditional impregnation method, which leads to serious agglomeration of active components and large particle size, which significantly reduces the number of active centers. Due to the weak interaction between the active component and the carrier, it is easy to cause the detachment and loss of the noble metal from the surface of the carrier after the strong stirring reaction, which reduces the availability of the catalyst and affects the performance of the hydrogenation product

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