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A kind of preparation method of high-performance hydrogenated rubber elastomer
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A hydrogenated rubber and elastomer technology, applied in the field of rubber elastomers, can solve the problems of affecting product processing performance, poor safety, rubber hardening, etc., and achieve the effects of heat resistance, convenient operation, and improved aging resistance
Active Publication Date: 2021-03-26
BEIJING UNIV OF CHEM TECH
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However, high-pressure hydrogen and noble metal catalyst RhCl (PPh 3 ) 3 , poor security, high cost
However, the only mature method for emulsion hydrogenation is hydrogen peroxide / hydrazine hydrate / Cu + Although the hydrogenation system can obtain hydrogenated styrene-butadiene rubber with a higher degree of hydrogenation, the presence of metal particle catalysts will affect the purity of the product and make the rubber harder, thus affecting the processing and performance of the product
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Embodiment 1
[0021] Present embodiment relates to a kind of synthetic method of high-performance hydrogenated styrene-butadiene rubber, comprises the steps:
[0022] 1) First add 50g of SBR emulsion into a round bottom flask, add 5g of high-pigment carbon black, stir for 30 minutes, mix well, then add 10g of hydrazine hydrate, and stir at a speed of 200r / min under normal pressure , the reaction temperature was 40°C, and the hydrogenation reaction was stirred for 8 hours; the reaction stock solution was obtained;
[0023] 2) The reaction stock solution was prepared by precipitation with absolute ethanol, washing, and drying at 50°C for 24 hours. The molar ratio of hydrazine hydrate and unsaturated carbon-carbon double bond [-C=C-] in the above examples was 2: 1. The degree of hydrogenation was detected to be 12.2%.
Embodiment 2～5
[0025] Same as Example 1, the only difference is that the reaction temperatures are respectively 50°C, 60°C, 70°C, and 80°C. The degrees of hydrogenation were detected to be 40.2%, 34.9%, 32.1%, and 29.0%, respectively.
Embodiment 6
[0027] Present embodiment relates to a kind of synthetic method of high-performance hydrogenated styrene-butadiene rubber, comprises the steps:
[0028] 1) First add 50g of SBR emulsion into a round bottom flask, add 5g of high-pigment carbon black, stir for 30 minutes, mix well, then add 10g of hydrazine hydrate, and stir at a speed of 200r / min under normal pressure , the reaction temperature is 60°C, and the hydrogenation reaction is stirred for 8 hours; the reaction stock solution is obtained;
[0029] 2) The reaction stock solution was prepared by precipitation with absolute ethanol, washing, and drying at 50°C for 24 hours. The molar ratio of hydrazine hydrate and unsaturated carbon-carbon double bond [-C=C-] in the above examples was 2: 1. The degree of hydrogenation was detected to be 40.2%.
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Abstract
The invention relates to a catalyst, a high-performance hydrogenated rubber elastomer, and a preparation method of the elastomer. The catalyst is carbon black, and the carbon black has a specific surface area of 500-600 cm<2> / g and a particle size of 10-15nm; and an unsaturated rubber emulsion is an SBR emulsion or an NBR emulsion. The novel catalyst adopted by the invention provides the new preparation method for preparing the high-performance hydrogenated rubber elastomer, and the prepared hydrogenated rubber elastomer material has potential application values in the field of high-performance rubbers. Unsaturated carbon-carbon double bonds on the molecular chain of butadiene styrene rubber are subjected to emulsion hydrogenation under the action of the novel catalyst to prepare the high-performance hydrogenated butadiene styrene rubber elastomer. The HSBR elastomer prepared in the invention has excellent heat resistance and good mechanical properties.
Description
technical field [0001] The invention relates to the field of rubber elastic body, in particular to a preparation method of high-performance hydrogenated rubber elastic body. Background technique [0002] SBR is an elastomer obtained by emulsion polymerization of butadiene and styrene. It has good wear resistance, but due to the presence of carbon-carbon unsaturated double bonds in the molecular chain, it has poor resistance to high temperature and thermal oxygen aging. In order to improve its high temperature resistance and thermal oxygen aging resistance, its unsaturated carbon-carbon double bond can be hydrogenated and modified. [0003] Existing studies have adopted the method of solution hydrogenation, using RhCl(PPh 3 ) 3 Catalytic hydrogenation of SBR, the hydrogenation degree can reach more than 95% after 12 hours of reaction time, this kind of catalyst has good hydrogenation activity and good selectivity. However, high-pressure hydrogen and noble metal catalyst R...
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