1、第2期Preparation and properties of ultraviolet curing sulfur containing sealantMIN Ya-lan1,HOU Ping-an1,LIU Yi-fan2,ZHANG Jian-zheng2（1.VIC Chengdu Aircraft Industrial(Group)Co Ltd,Chengdu 610061,China;2.AECC Beijing Institue ofAeronautical Materials,Beijing 100095,China）Abstract:The Thiol-ene click r
2、eaction was usedto prepare photoinitiated radical curing sealantsbased on polythioether rubber.The effect of typesand amount of photoinitiators in the curing system,aswell as the types of olefins and polythiols on the me-chanical properties of the sealant after vulcanization,temperature of thermal d
3、ecomposition,and glasstransition temperature were studied.The resultsshowed that compared with photoinitiator 184,thecu-ring effect and thermal stability of the curedsealant were better when using photoinitiator 1173,and the mechanical properties and thermal stabilityof the sealant decreased with in
4、creasing amount ofphotoinitiator.And the appropriate amount of pho-toinitiator 1173 was 0.03 phr（mass,the same be-low）.The mechanical properties of polythioethersealant cured with tripropylene glycol diacrylate（TPGDA）as curing agent were the best,and themechanical properties and thermal stability of
5、 thesealant increased with increasing amount of TPGDA.And the appropriate amount of TPGDA was 1.00 phr.The addition of multifunctional mercaptan could im-prove the crosslinking degree of the sealant and alsomake the glass transition temperature increased.Key words:liquid polythioether rubber;ultravi
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8、ess in Polymer Science，2006，31（5）：487-531.闵雅兰等.紫外光固化含硫密封剂的制备及性能国内简讯2023年1-2月我国合成橡胶进出口概况据 合 成 橡 胶 工 业 协 会 网 站3月21日 报 道，2023年1-2月，我国共进口主要合成橡胶166kt，与2022年同期相比增加1 kt，增幅1%。2023年1-2月，我国共出口主要合成橡胶97kt，与2022年同期相比增加52 kt，增幅117%。我国共进口合成胶乳29 kt，与2022年同期相比减少了10%；进口天然胶乳共75 kt，同比增加了1%。我国共进口复合橡胶7 kt，与2022年同期相比减少了37%；进口天然橡胶共310 kt，同比减少了8%；进口天然橡胶与合成橡胶混合物共736 kt，同比增加了28%。99
