车用橡胶输油管及管件在甲醇汽油和DMC甲醇汽油中溶胀机理浅析  

Discuss on the swelling mechanism of rubber oil pipes and pipe fittings for cars in the methanol gasoline and DMC-methanol gasoline

作　　者：唐治钫 王君山 黄星亮[2] 范立成 孙秀丽 

机构地区：[1]北方华锦化学工业股份有限公司,辽宁盘锦124021 [2]中国石油大学(北京),北京102249

出　　处：《天然气化工—C1化学与化工》2017年第2期94-100,共7页Natural Gas Chemical Industry

摘　　要：基于对在汽油、甲醇汽油、碳酸二甲酯(DMC)汽油和DMC甲醇汽油中溶胀前后的橡胶车用输油管件进行差热、拉伸应力、SEM电镜物性等表征结果,初步探讨了甲醇、DMC、汽油与NBR橡胶溶胀之间的相互关系,提出NBR橡胶在甲醇汽油、DMC甲醇汽油中的溶胀的机理:a)NBR橡胶高分子中极性基团的氮元素作用于甲醇中的氢元素,形成氢键;b)NBR橡胶高分子中极性基团的氮元素吸附或吸收甲醇分子;c)高分子聚合物中的小分子量高分子与甲醇分子作用;d)DMC与甲醇的相互作用,即一个DMC分子与多个甲醇分子以氢键形式结合在一起,形成新的分子集团,从而减弱了DMC的极性,使得DMC甲醇汽油中DMC对橡胶的影响明显小于无甲醇时DMC的影响。Based on the experimental results of differential thermal analysis, tensile stress and scanning electron microscope characterization on the rubber oil pipes and pipe fittings for cars before and after soaking in the gasoline, methanol gasoline, dimethyl carbonate （DMC） gasoline and DMC-methanol gasoline, the effects of methanol, dimethyl carbonate （DMC） and gasoline on the swelling of NBR ruber were discussed, and the swelling mechanisms of NBR ruber in the methanol gasoline and dimethyl DMC- methanol gasoline were proposed： a） the nitrogen elements of polar groups in the NBR rubber forming hydrogen bonds with the hydrogen elements in methanol; b） the nitrogen elements of NBR rubber polar groups adsorbing or absorbing methanol molecules; c） methanol molecules emitting effects on the polymers with lower molecular weight in NBR rubber; d） the interaction of DMC with methanol forming the new molecules group consisting of a DMC molecule and several methanol molecules by hydrogen bonds, which weakening the polarity of DMC, resulting in the effect of DMC on the swelling of NBR rubber is obviously smaller in the DMC- methanol gasoline than that in the DMC gasoline without methanol.

关 键 词：甲醇汽油 DMC甲醇汽油 车用输油管件 NBR橡胶 溶胀机理 

分 类 号：TQ517.4[化学工程]