Cov khoom tseem ceeb ntawm butyl roj hmab yog ntxiv.Cov khoom no kuj muaj nyob rau hauv butyl nplaum
(1) Huab cua permeability
Lub dispersion ceev ntawm cov roj nyob rau hauv lub polymer muaj feem xyuam rau lub thermal kev ua si ntawm lub polymer molecules.Cov methyl pab pawg hauv cov roj hmab roj hmab molecular tau siv ntau dua, uas txwv qhov cua sov ua haujlwm ntawm cov haujlwm polymer.Yog li ntawd, cov roj permeability yog tsawg thiab cov roj nruj yog zoo.
(2) Thermal invariance
Butyl roj hmab vulcanizates muaj cov cua kub zoo heev thiab tsis muaj kev sib hloov.Sulfur vulcanized butyl roj hmab tuaj yeem siv tau rau hauv huab cua ntev ntawm 100 ℃ lossis qis dua kub.Daim ntawv thov kub ntawm resin vulcanized butyl roj hmab tuaj yeem ncav cuag 150 ℃ - 200 ℃.Lub thermal oxygen aging ntawm butyl roj hmab belongs rau hom degradation, thiab kev laus yog softening.
(3) Lub zog nqus
Cov qauv molecular ntawm butyl roj hmab yog luv luv ntawm ob daim ntawv cog lus, thiab qhov sib txawv ntawm qhov sib txawv ntawm sab saw methyl pawg loj, yog li nws muaj cov yam ntxwv zoo ntawm kev txais kev vibration thiab cuam tshuam lub zog.Cov yam ntxwv rebound ntawm butyl roj hmab tsis ntau tshaj 20% nyob rau hauv ib tug dav kub ntau yam (- 30-50 ℃), uas qhia meej meej hais tias lub peev xwm ntawm butyl roj hmab kom tau txais cov neeg kho tshuab zog yog superior rau lwm yam roj hmab.Cov khoom damping ntawm butyl roj hmab ntawm kev kub ceev deformation yog muaj nyob rau hauv ntu polyisobutylene.Rau qhov loj, nws tsis cuam tshuam los ntawm daim ntawv thov kub, degree ntawm unsaturation, vulcanization zoo thiab cov qauv hloov.Yog li ntawd, butyl roj hmab yog cov khoom siv zoo tshaj plaws rau lub suab rwb thaiv tsev thiab txo kev co thaum lub sijhawm ntawd.
(4) Cov cuab yeej kub qis
Qhov chaw qauv ntawm butyl roj hmab molecular saw yog muab kauv.Txawm hais tias muaj ntau pawg methyl, txhua khub ntawm methyl pawg tau tawg ntawm ob sab ntawm cov kauv yog staggered los ntawm lub kaum sab xis.Yog li ntawd, cov roj hmab butyl roj hmab molecular saw tseem yog maj mam, nrog cov iav hloov pauv kub thiab zoo elasticity.
(5) Ozone thiab aging kuj
Lub siab saturation ntawm butyl roj hmab molecular saw ua rau nws muaj siab ozone kuj thiab huab cua aging kuj.Qhov kev tiv thaiv ozone yog li 10 npaug siab dua li ntawm cov roj hmab ntuj.
(6) Chemical invariance
Cov qauv siab saturated ntawm butyl roj hmab ua rau nws muaj tshuaj lom neeg tsis sib xws.Butyl roj hmab muaj zoo heev corrosion kuj rau feem ntau inorganic acids thiab organic acids.Txawm hais tias nws tsis tuaj yeem tiv taus cov concentrated oxidizing acids, xws li nitric acid thiab sulfuric acid, nws tuaj yeem tiv taus tsis muaj oxidizing acids thiab nruab nrab concentration oxidizing acids, nrog rau alkali daws thiab oxidation rov qab daws.Tom qab soaking nyob rau hauv 70% sulfuric acid rau 13 lub lis piam, lub zog thiab elongation ntawm butyl roj hmab twb tsis tshua ploj, thaum lub zog ntawm tej yam ntuj tso roj hmab thiab styrene butadiene roj hmab yog heev txo.
(7) Kev ua haujlwm hluav taws xob
Cov hluav taws xob rwb thaiv tsev thiab corona kuj ntawm butyl roj hmab yog zoo dua li cov roj hmab yooj yim.Lub ntim resistivity yog 10-100 npaug siab dua li cov roj hmab yooj yim.Lub dielectric tsis tu ncua (1kHz) yog 2-3 thiab lub zog ua haujlwm (100Hz) yog 0.0026.
(8) Kev nqus dej
Cov dej nkag mus ntawm butyl roj hmab yog qhov tsawg kawg nkaus, thiab qhov nqus dej ntawm qhov kub ib txwm qis dua li lwm cov roj hmab, tsuas yog 1 / 10-1 / 15 ntawm qhov kawg.
