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Preparation method of hydrogenated nitrile rubber and degradation and hydrogenation method of butadiene type rubber

A technology of butadiene and rubber is applied in the field of preparation of hydrogenated butadiene rubber, and can solve the problems that hydrogenated nitrile rubber cannot be used at the same time and cannot be prepared.

Active Publication Date: 2012-07-25
ZANNAN SCITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defect that existing various catalysts cannot be applied to hydrogenated nitrile rubber with low Mooney viscosity and high Mooney viscosity at the same time, such as the Ru catalyst represented by Grubbs cannot prepare medium and high-grade Hydrogenated nitrile rubber with a Mooney viscosity (ML1+4; 100°C) of 55-110, palladium, rhodium and other catalysts cannot prepare hydrogenated butadiene with a low Mooney viscosity (ML1+4; 100°C) of 5-55 The limitations of rubber, thus providing a method for preparing high-performance hydrogenated butadiene rubber with a wide controllable range of Mooney viscosity (ML1+4; 100°C) of 5-130

Method used

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  • Preparation method of hydrogenated nitrile rubber and degradation and hydrogenation method of butadiene type rubber
  • Preparation method of hydrogenated nitrile rubber and degradation and hydrogenation method of butadiene type rubber
  • Preparation method of hydrogenated nitrile rubber and degradation and hydrogenation method of butadiene type rubber

Examples

Experimental program
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Effect test

Embodiment 1

[0112] Under the Ar condition, add 60g of nitrile rubber (NBR; N41L) and 500mL of anhydrous chlorobenzene in a 1L stainless steel airtight container, add Jane's ruthenium catalyst (4ab, 4ab, The amount used is 0.04wt% of the mass of nitrile rubber), and the reaction is 12hr to obtain low molecular weight NBR. The degradation product is precipitated with methanol and dried; the degradation product M w =2.78E+05, M n =1.586E+5, the Mooney viscosity (ML(1+4); 100° C.) was 60.3, and the yield was >97%.

Embodiment 2

[0113] The preparation of embodiment 2 hydrogenated nitrile rubber (step-by-step method)

[0114] Under the Ar condition, add 60g of nitrile rubber (NBR; N41L) and 500mL of anhydrous chlorobenzene in a 1L stainless steel airtight container, add the Jane's ruthenium catalyst (4aa, Consumption is nitrile rubber 0.07wt%). Hydrogen gas was introduced until the pressure reached 5 MPa, then the temperature was raised to 130° C., and the reaction was carried out for 10 hours. HNBR with low molecular weight and high degree of hydrogenation is obtained. The HNBR product is precipitated with methanol and dried to obtain the product M w =1.60E+05, M n =1.12E+05, iodine value=12.6, hydrogenation degree>95%, yield>98%, molecular weight distribution dispersity 1.4.

Embodiment 3

[0115] The preparation of embodiment 3 hydrogenated nitrile rubber (one-step method)

[0116] Under the condition of Ar, add 60g of nitrile rubber (NBR) and 500mL of anhydrous chlorobenzene into a 1L stainless steel airtight container, and after completely dissolving at 30°C, inject hydrogen until the pressure reaches 8.0MPa. Raise the temperature to 125°C, add the Jane's ruthenium catalyst (4aa, the amount is 0.1wt% of the nitrile rubber) in the general formula (I), and react for 15-10 hours until the hydrogenation reaction reaches 95-99%. HNBR with a high degree of hydrogenation is obtained. The degraded and hydrogenated HNBR product was precipitated with methanol and dried to obtain the product M w =1.80E+05, M n =1.07E+05, iodine value=3.1, hydrogenation degree>99%, yield>98%, molecular weight distribution dispersity 1.7.

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Abstract

The invention discloses a preparation method of hydrogenated butadiene special rubber, which comprises the following steps: subjecting butadiene rubber to a degradation reaction and a hydrogenation reaction under an action of a Zhan Catalyst as showed in the general formula I to obtain hydrogenated butadiene special rubber. The invention also provides a degradation reaction of the butadiene rubber, which is also under the action of a Zhan Catalyst as showed in the general formula I. The preparation method provided by the invention overcomes the shortcomings that the existing various types of catalysts can not be applicable to the preparation of low Mooney viscosity and high Mooney viscosity hydrogenated butadiene special rubber at the same time, so as to provide a preparation method of high-performance hydrogenated butadiene special rubber with a wide controllable Mooney viscosity range of 5-130. The catalyst used in the invention is the catalyst for both rubber degradation and hydrogenation reduction, so as to avoid a process requiring addition of the catalysts with different catalytic activities in two times respectively in the prior art. The method is simple, and easy to operate.

Description

technical field [0001] The invention relates to a preparation method of a hydrogenated butadiene rubber, and also relates to a degradation and hydrogenation method of the butadiene rubber. Background technique [0002] Hydrogenated nitrile rubber (HNBR) is a hydrogenated butadiene rubber containing 15-55% acrylonitrile units (the side chain is a nitrile group "CN"). It is a nitrile rubber (NBR, containing 15-55% acrylonitrile Units and 45-85% butadiene units are copolymerized) a type of special rubber prepared by selective catalytic hydrogenation of unsaturated carbon-carbon double bonds, which has good oil resistance, heat resistance and ozone resistance And chemical resistance, and has the advantages of good stability, higher wear resistance and better machinability. At present, the products processed by HNBR are widely used in the fields of motor vehicles, oil exploration and processing, electrical, mechanical engineering and shipbuilding, including but not limited to au...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/08C08C19/02
Inventor 詹正云
Owner ZANNAN SCITECH
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