Lub hauv paus thiab daim ntawv thov yam ntxwv ntawm cov roj hmab tshwj xeeb
Cov roj hmab tshwj xeeb hais txog cov roj hmab uas muaj qee yam tshwj xeeb. Cov khoom tseem ceeb yog: ①Nitrile-butadiene roj hmab, hu ua NBR, yog tau los ntawm copolymerization ntawm butadiene thiab acrylonitrile. Nws muaj cov roj ua haujlwm zoo thiab kev laus ua haujlwm, thiab tuaj yeem siv tau ntev hauv huab cua ntawm 120 degree lossis hauv cov roj ntawm 150 degree. Tsis tas li ntawd, nws kuj muaj dej tsis kam, huab cua nruj thiab kev sib txuas zoo heev. ②Silicone roj hmab, cov saw tseem ceeb yog tsim los ntawm alternating silicon thiab oxygen atoms, nrog cov organic pawg ntawm silicon atoms. Kub thiab kub tsis kam, ozone kuj, zoo hluav taws xob rwb thaiv tsev. ③ Fluorine roj hmab, cov roj hmab hluavtaws uas muaj fluorine atoms hauv nws cov qauv molecular. Nws yog feem ntau qhia los ntawm tus naj npawb ntawm fluorine atoms ntawm fluorine-muaj units nyob rau hauv lub copolymer, xws li fluororubber 23, uas yog ib tug copolymer ntawm vinylidene fluoride thiab chlorotrifluoroethylene. fluorine roj hmab tiv taus kub, roj thiab tshuaj lom neeg corrosion. ④ Polysulfide roj hmab, uas yog tsim los ntawm polycondensation ntawm dihaloalkanes thiab polysulfides ntawm alkali hlau los yog alkaline ntiaj teb hlau. Nws muaj cov roj ua haujlwm zoo thiab hnyav hnyav, tab sis lub zog tsis siab, kev laus ua haujlwm thiab kev ua haujlwm tsis zoo, thiab nws muaj ntxhiab tsw phem. Nws yog feem ntau siv ua ke nrog nitrile roj hmab. Tsis tas li ntawd, muaj cov roj hmab polyurethane, chlorohydrin roj hmab, acrylate roj hmab thiab lwm yam.