Fluororubber yog cov roj hmab hluavtaws uas muaj cov tshuaj fluorine atoms. Nws muaj cov yam ntxwv ntawm siab kub tiv taus, roj tsis kam thiab tiv taus ntau yam tshuaj lom neeg. Nws yog qhov zoo tshaj plaws nruab nrab ntawm tag nrho cov elastomers thiab muaj huab cua zoo tiv thaiv thiab huab cua tsis kam. Nws ua hauj. Ib qho ntawm nws cov hom tseem ceeb yog copolymer ntawm perfluoropropene thiab vinylidene fluoride, kev lag luam tawm txawv teb chaws lub npe viton, lwm tus yog copolymer ntawm chlorotrifluoroethylene thiab vinylidene fluoride, kev lag luam tawm txawv teb chaws lub npe Kel-F (roj hmab), lawv kub kub tsis kam, Kel-F siab kawg daim ntawv thov kub yog 205 ° C, zoo heev corrosion tsis kam, tiv taus ntau yam acids (suav nrog nruab nrab concentration ntawm oxidizing acid), tab sis cov kuab tshuaj tiv thaiv tsis zoo xws li fluoroplastics, tuaj yeem siv rau qhov kub thiab tsis kam thiab tshuaj lom neeg hauv kev lag luam tshuaj lom ib puag ncig, kuj siv raws li cov roj hmab txheej thiab nplaum. Cov tshuaj fluororubber tuaj yeem hloov qhov kev xav tau los kho kev kho, tab sis F4 tshuaj tsuag txujci thiab txheej txheej ua haujlwm tsis tuaj yeem siv cov khoom nruab nrab thiab loj. Los ntawm cov nqe lus pom, cov fluororubber anticorrosion kuj tseem qis dua F4 los tiv thaiv xeb.
Kev tsim cov roj hmab fluorine yog tsim los ntawm fluorine roj hmab, kua qaub lees txais, tus neeg sawv cev vulcanizing, nrawm nrawm, ntxiv dag zog thiab muab cov khoom ua tiav. Cov kev ua tau zoo ntawm fluororubber thiab txawv teb fluororubber yog qhov zoo ib yam, tab sis kev ua cov khoom txawv me ntsis. Cov kev ua tiav ntawm cov roj hmab hauv tsev tsis zoo, feem ntau vim tias Mooney viscosity siab, uas cuam tshuam rau qhov tsis zoo ntawm cov roj hmab ua.
Cov tshuaj fluororubber hauv tebchaws yog tshaj rau VitonA ntawm DuPont, Tebchaws Asmeskas, thiab 246 hom fluororubber yog sib npaug rau VitonB ntawm DuPont ntawm Tebchaws Meskas. Tus neeg saib xyuas vulcanizing ntawm cov roj hmab fluorine yog ua rau cov roj hmab fluorine muaj qee yam ntawm kev sib txuas, yog li nws ua haujlwm tau zoo. Lub vulcanization ntawm fluorine roj hmab ntawv tuaj yeem nqa tawm los ntawm kev siv lub tshuab ionic ntxiv ntawm nucleophilic reagent, lossis los ntawm qhov ntsuas dhau los ntawm cov peroxide lossis cov duab hluav taws xob. Qhov chaw mos ntawm tus neeg sawv cev ntawm cov tshuaj fluorine roj hmab ntawv yog txawv ntawm tus neeg saib xyuas vulcanizing siv rau lwm cov ntaub ntawv roj hmab. Kev siv cov tshuaj amine sib txuas (1 #, 3 # tus neeg sawv cev vulcanizing) vulcanized fluororubber tuaj yeem daws qhov yuav tsum ua ntawm cov khoom lag luam dav dav; siv 2 # vulcanizing tus neeg sawv cev tuaj yeem daws kev ua cov kua nplaum. Hauv fluororubber sealing cov kab lus, txhawm rau kom muaj qhov me me ntawm cov nqi deformation, ib qho phenol compound yuav tsum nyiam siv los ua tus neeg sawv cev vulcanizing. Xws li hydroquinone, bisphenol A, bisphenol AF, thiab lwm yam, nrog cov ntsuas hluav taws xob kom tsim nyog kom haum rau kev ua haujlwm siab. Hauv kev daws qhov tsis kam ntawm kev tawm xov xwm corrosive, nws raug nquahu kom siv peroxide-vulcanized fluororubber.
Qhov sib ntxiv ntawm cov kua roj (acid) txais rau fluorine roj hmab kuj tseem raug xa mus ua cov tshuaj stabilizer. Nws yog daws qhov teeb meem corrosion thiab pa phem ntawm hydrogen los ntawm hydrogen fluoride tsim thaum lub sijhawm ua cov roj hmab fluorine, kom cov tshuaj tiv thaiv sulfurization tuaj yeem mus zoo. Feem ntau, MgO, CaO, ZnO, PbO, thiab dibasic txhuas phosphite siv, thiab tus nqi ntawd feem ntau yog 5 txog 10 ntu. Lawv ntxiv tau nws tus kheej cov yam ntxwv: MgO muaj kev tiv thaiv zoo thaum tshav kub kub; PbO muaj cov kua qaub zoo tiv; CaO muaj cov txheej txheem me me deformation; nws tau zoo rau kev tshem tawm cov npuas; ZnO thiab dibasic txhuas phosphite, qhov kev npliag ntawm cov roj hmab tau zoo tuaj, thiab cov dej ua haujlwm tau zoo; OH) 2 muaj me me deformation, thiab Ca (OH) 2 thiab nquag MgO ntxiv. Hauv qhov system phenolic vulcanization, ib qho kev ua kom tsis muaj zog deformation ntau tuaj yeem txais tau. Hauv ntej, xaiv cov kua qaub tsim nyog kom tau raws li cov kev ua tau tiag tiag.
Fluororubber yog cov roj hmab tiv thaiv tus kheej. Vim tias qhov sib txawv ua tau raws li kev xav tau thiab kev siv cov roj hmab fluorine, nws yuav tsum tau hloov kho los ntawm kev txhawb zog thiab kev ua kom tiav los hloov nws txoj haujlwm thiab nqi rau cov kev xav tau ntawm cov neeg siv. Feem ntau siv rau hauv ib qho nyiaj nruab nrab ntawm 10-30 seem. Txog tam sim no, cov khoom siv feem ntau ntawm cov khoom siv roj khov yog feem ntau thermal dub carbon (N-990), txau cov xim dub, carbon dawb dub, calcium sulfate, barium sulfate, calcium oxide, carbon fiber thiab lwm yam. Cov xim fluororubber tuaj yeem siv cov xim carbon dawb dub, titanium dawb, calcium fluoride, calcium carbonate, thiab lwm yam, thiab cov xim sib xws tuaj yeem siv kom tau cov roj hmab sib txuas. Txawm li cas los xij, thaum ua cov txheej txheem compression hom sealing cov khoom lag luam, thaum xaiv cov khoom siv xim, nws yuav tsum them sai sai rau qhov kev sib txuam tsim nyog ntawm cov xim thiab cov cua sov, thiab tseem yuav tswj tau qhov compression deformation tus nqi ntawm cov khoom siv roj hmab, yog li cov khoom lag luam tuaj yeem hloov kho rau kev ua haujlwm hauv qab compression.
Kev ua cov khoom pabcuam yog qhov ua tau zoo tshaj plaws hauv kev ua fluororubber hauv xyoo tsis ntev los no. Nws tuaj yeem txhim kho cov txheej txheem sib tov ntawm fluororubber, tiv thaiv scorch, thiab txhim kho kev npliag thiab kev txhaws ntawm cov roj hmab txuas tsis cuam tshuam rau kev ua tiav ntawm cov roj hmab compound. Thiab tuaj yeem tiv thaiv cov menyuam cov nplaum thiab cov nplaum ua tiav thaum tab tom ua, thiab ua lub luag haujlwm ntawm tus pwm tso tawm sab nraud. Hauv kev ua cov ntawv fluorine roj hmab, cov txheej txheem ua tshiab xws li fluoro ciab, zinc stearate, Ws280 thiab cov siv quav ciab tau tshwm sim, uas muab txoj hauv kev tshiab rau kev ua thiab daim ntawv thov ntawm fluorine roj hmab los xij.
Cov txheej txheem ua thiab cov khoom siv ntawm cov roj fluorine thiab cov txheej txheem ua yog tib yam li cov roj hmab roj hmab. Vim tias tus yam ntxwv ntawm fluororubber, nws cov khoom ua haujlwm tsis zoo.
Mastication: Cov roj hmab nyoos yog thinned 10 zaug hauv qhov qhib pob zeb nrog yob nrug ntawm 0.3 ~ 0.5mm, thiab tus sawv cev sib xyaw ua ke tuaj yeem raug ntxiv rau hauv lub yob.
Kev sib xyaw: qhov peev xwm ntawm fluororubber yog me dua qhov hluavtaws roj hmab; cov menyuam qhov kub thiab txias feem ntau tswj tau ntawm 40-60 ° C; qhov kev txiav txim siab ntawm kev pub mis: roj hmab nyoos → cov kua qaub ua kom lub cev → cov tshuaj pabcuam → ua kom zoo siab er cov roj nqus kom rho tawm can vulcanization accelerator Tom qab sib ntxiv ntawm tus neeg sawv cev compounding, tusyees thiab nyias nyias, lub hnab peb tog, yob, thiab tom qab ntawd zaj duab xis.
Vulcanized vulcanization yuav tsum tau nqa tawm hauv ob kauj ruam: ib-theem vulcanization 165-170 ° C × 10 min; ob-theem vulcanization 230 ° C × 24 h (txhawm rau paub tseeb tias cua sov maj mam kub, tom qab 230 ° C, qhov kub thiab txias tas li.
Cov tshuaj fluororubber yuav tsum ua tiav los ntawm cov kws tshaj lij thiab cov neeg ua haujlwm tshaj lij. Yuav tsum tsis txhob muaj kev ncua nyob hauv txhua feem ntawm cov txheej txheem kev ua haujlwm, txwv tsis pub nws yuav ua rau cov khoom tsis xws luag, uas yuav ua rau nws tsis tuaj yeem ua rau qhov nyuaj.