Preparation method of macromolecule-supported catalyst for hydrogenation of nitrile-butadiene rubber

Abstract

The invention relates to a preparation method of a macromolecule-supported catalyst for hydrogenation of nitrile-butadiene rubber and belongs to the field of rubber hydrogenation. The preparation method comprises the following steps of: adding a catalyst rhodium trichloride (RhCl3) and resins with different functional groups into a high-pressure reaction kettle according to the mass ratio of the RhCl3 to the resins of 1:10-1:100; dissolving the nitrile-butadiene rubber into dimethylbenzene to prepare rubber solution; adding the rubber solution into the high-pressure reaction kettle; and stirring and heating the mixture for 0.5 to 12 hours and performing hydrogenation at hydrogen pressure of 0.5 to 3.0 MPa and at hydrogenation temperature of between 25 and 150 DEG C. The preparation methodhas the advantages that: the catalyst is prepared in situ; after the reaction is finished, a substrate and the catalyst are subjected to simple filtering separation; and the catalyst still has catalytic activity. The defects that the catalyst preparation is complex and is difficult to recover due to homogeneous phase catalytic hydrogenation are overcome.

Description

technical field [0001] The invention relates to a preparation method of a polymer-loaded catalyst for hydrogenation of nitrile rubber, in particular to selective hydrogenation of unsaturated carbon-carbon double bonds on molecular chains of butadiene and acrylonitrile copolymers in a heterogeneous solution. Background technique [0002] Hydrogenated nitrile rubber (hereinafter referred to as HNBR) is generally obtained by hydrogenating a solution of NBR. It is used in a wide range of applications due to its excellent oil resistance, chemical resistance, and weather resistance. Mainly used in sealing rings of automobiles, ships, and spacecraft, oil-resistant pipelines, etc. [0003] The solution-selective hydrogenation of NBR occupies an irreplaceable position in the preparation of HNBR. The most effective catalyst for the solution-selective hydrogenation of NBR is Wilkinson catalyst, RhCl(PPh 3 ) 3 . However, the abundance of rhodium (Rh) in the earth's crust is very lo...

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Problems solved by technology

It is mentioned in the Chinese patent CN1058973C that alumina or diatomaceous earth is used as a carrier to load a small amount of palladium before the glue is hydrogenated, and the carrier used has a pore size of 100-1000A and a specific surface area of ​​50-500m 2 / g, but the patent requires a higher load pretreatment method, and may cause the carrier to be lost in the glue

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