Optimization ntawm HNBR roj hmab tebchaw rau high-temperature dynamic daim ntaub ntawv

Hydrogenated nitrile roj hmab (HNBR) feem ntau yog siv rau hauv cov ntawv thov uas yuav tsum muaj qhov kub thiab txias tsis muaj zog thiab kev laus ua haujlwm zoo, tom qab o hauv cov roj thiab cov kua dej Tom qab o hauv cov roj thiab cov kua dej, HNBR feem ntau yog siv rau hauv cov ntawv thov uas xav tau cov khoom muaj zog ntawm qhov kub thiab qis thiab kev laus zoo. Cov ntawv thov uas xav tau cov khoom no yog cov hlua khi lub sijhawm, lub siab siab hoses thiab ntawv yob. Cov khoom siv roj hmab siv tau raug rau cov kev xav tau zoo heev thiab feem ntau raug cuam tshuam los ntawm ntau qhov kub thiab txias. Cov kev ntsuam xyuas ib txwm siv los qhia txog cov khoom siv hluav taws xob zoo ntawm cov khoom siv feem ntau ua nyob rau hauv chav tsev kub.

Thaum cov kev ntsuam xyuas no tuaj yeem ua tus yam ntxwv ntawm cov khoom tsis zoo, kev ntsuas ntawm qhov kub thiab txias tsis cuam tshuam qhov cuam tshuam ntawm qhov kub thiab txias ntawm kev sib xyaw ua ke-monomer. muab tub lim thiab muab tub lim-polymer kev sib cuam tshuam thiab lawv cov txiaj ntsig ntawm cov khoom siv ntawm qhov kub siab heev. Rau cov polymers tsim tshwj xeeb rau kev siv kub, kev nkag siab ntawm qhov kub thiab txias ntawm cov khoom siv yog tsim nyog rau kev sib xyaw kom zoo.

Hauv daim ntawv no, cov txiaj ntsig ntawm qhov kub thiab txias ntawm cov khoom siv roj hmab tau raug tshawb xyuas, tsom mus rau hom muab tub lim, nws qhov ntau npaum li cas, thiab kev cuam tshuam ntawm cov muab tub lim nrog HNBR thiab hydrogenated carboxylated nitrile butadiene roj hmab (HXNBR) polymers.

Rau lub hom phiaj no, daim ntawv no piv rau kev txhawb zog (N330) thiab tsis muaj zog (N990) carbon dub nrog silica (VulcasilN). Qhov saum npoo ntawm silica tuaj yeem hloov kho ob qho tib si passively (filler deg hydrophobic) thiab nquag (filler deg hydrophobic thiab bonded rau polymer). Ib qho ntxiv ntawm cov tebchaw kuj tseem siv cov khoom siv monomeric, xws li zinc diacrylate (ZAD), uas tuaj yeem ua polymerized hauv situ thaum lub sij hawm vulcanization los txhim kho cov khoom siv. Cov tshiab 'fillers' thiab lawv cov kev cuam tshuam nrog cov polymer matrix tseem tsis tau kawm txog qhov kub thiab qhov zaus ntawm cov khoom. Cov tshiab 'fillers' thiab lawv cov kev cuam tshuam nrog cov polymer matrix tsis tau kawm nyob rau hauv cov nqe lus ntawm kub thiab zaus nyob ntawm cov khoom.

Raws li cov neeg kho tshuab thiab dynamic mechanical zog ntawm vulcanized thiab unvulcanized HNBR tebchaw, ntau yam fillers (carbon dub, silica thiab ZDA) tau soj ntsuam rau filling. thiab ZDA) ua tiav cov qauv HNBR thiab HXNBR cov roj hmab tau txheeb xyuas nrog rau qhov ntsuas kub ntawm cov khoom txhawb nqa.

Qhov txo qis hauv cov qauv nrog qhov kub thiab txias rau tag nrho cov roj hmab unvulcanized (tshwj tsis yog cov silica-filled system) yog qhov tshwm sim ntawm qhov kub thiab txias ntawm cov viscosity ntawm polymer matrix. Hom thiab tus nqi ntawm cov muab tub lim nyob rau hauv lub binder tsuas yog txiav txim siab txog qib ntawm kev txhawb zog thiab tsis muaj kev cuam tshuam rau qhov kub thiab txias nyob ntawm qhov txo qis hauv binder modulus.

Rau silica-filled adhesives, lub coalescence ntawm silica hais txiav txim siab kub-nyob ntawm tus cwj pwm. Yog hais tias silica nto yog kho nrog silica alkane kev kho mob kom ua tiav hydrophobicity, lub coalescence ntawm silica hais yog inhibited. Ntawm qhov loj deformation amplitudes, lub zog ntawm tag nrho cov carbon dub thiab silica-filled compounds yuav piav raws li hydrodynamic reinforcement nkaus xwb.

Yog tias ZDA siv los ua ib qho muab tub lim, tsis muaj qhov cuam tshuam ntxiv yog pom nyob rau hauv cov khoom siv roj hmab unvulcanized vim tias ZDA tseem tsis tau polymerized thiab ua haujlwm tsuas yog cov txheeb ze molecular mass plasticizer. ZDA-muaj cov tebchaw muaj viscosities tsawg ntawm txhua hom, qhia txog kev ua haujlwm zoo.

Kev sib piv ntawm dynamic mechanical zog thiab kev nyuaj siab-on-strain zog ntawm cov roj hmab vulcanized tau pom tias ZDA-filled HXNBR roj hmab compound muaj qhov zoo tshaj plaws complementary Strength thiab siab tshaj plaws mechanical zog (kev nyuaj siab thiab elongation ntawm so) txo nrog nce kub rau tag nrho cov binders. Kev sib cuam tshuam muaj zog ntawm qhov chaw muab tub lim thiab cov polymer matrix txhim khu cov nyhuv ntawm qhov kub thiab txias ntawm cov khoom siv ntxiv. Txawm hais tias kev sib cuam tshuam ionic ntawm ZDA thiab HXNBR pawg carboxyl ua kom muaj kev ntxhov siab tawg, cov kev sib cuam tshuam ionic tsis muaj kev cuam tshuam rau qhov kub ntawm qhov kev ntxhov siab ntawm pob txha. Qhov no qhia tau hais tias kev sib cuam tshuam ionic ruaj khov ntawm ZDA thiab functionalized polymer matrix (HXNBR) yog qhov yuav tsum tau ua ua ntej rau cov khoom siv zoo heev thiab cov khoom siv hluav taws xob zoo ntawm cov khoom siv roj hmab uas tsis tshua muaj hysteresis poob nyob rau hauv dynamic deformation tej yam kev mob.