Cov yam ntxwv ntawm kev ua haujlwm ntawm cov khoom sib txhuam txiav txim siab cov txheej txheem tsim khoom
Phenolic resin yog ib qho tseem ceeb hauv cov qauv ntawm cov ntaub ntawv sib txhuam, thiab nws yog ib qho tseem ceeb kom nkag siab txog nws cov txheej txheem kev ua tau zoo. Cov txheej txheem molding tuaj yeem muab faib ua casting molding thiab compression molding. Kev tsim cov khoom siv phenolic kev sib txhuam siv cov txheej txheem kub xovxwm. Muaj ob qhov laj thawj yog vim li cas phenolic pressed plastics yog solidified thiab molded nyob rau hauv cua sov thiab siab tej yam kev mob. Thawj yog qhov fluidity ntawm cov yas nias. Nyob rau hauv kev tsim cov ntaub ntawv kev sib txhuam, thiaj li yuav tau txais kev sib txhuam kev ua tau zoo thiab kev siv lub zog ntawm cov ntaub ntawv sib txhuam, qhov ntau npaum li cas ntawm cov khoom siv thiab cov khoom siv fiber ntau feem ntau suav rau 80% mus rau 90% ntawm cov khoom siv mis, thaum qhov ntau npaum li cas ntawm resin binders yog. Tsuas yog Nws suav rau 10% ~ 20%, yog li qhov fluidity ntawm nws cov yas nias yog qhov tsis zoo. Yog tias siv cov txheej txheem molding, cov yas nias tsis tuaj yeem ntim nrog cov kab noj hniav kom tau txais cov khoom pwm.
Peb feem ntau yuav tsum tau siv cov txheej txheem cua sov thiab cov txheej txheem molding, kom cov yas nias ntws los ntawm lub siab ntawm cov pwm kab noj hniav rhuab mus rau qhov kub kub (170 ~ 180 degree), ua rau pwm kab noj hniav, thiab kho los ntawm cua sov, yog li ntawd. tau kho molding. cov khoom. Qhov thib ob yog tias cov phenolic resin nyob rau hauv cov yas compression txuas ntxiv ua rau cov tshuaj tiv thaiv polycondensation ntawm qhov kub thiab txias, maj mam hloov los ntawm cov qauv kab los yog cov qauv saw hlau mus rau hauv peb-seem sib txuas network qauv, thiab thaum kawg solidifies. Thaum lub sij hawm tus txheej txheem no, cov resin yuav tso cov dej noo thiab lwm yam khoom uas tsis muaj molecular, uas yuav ua rau kom lub zog loj ntawm lub molding kub (150 degree). Yog tias lawv khiav tawm ntawm qhov chaw ntawm cov khoom molded, cov khoom yuav raug puas tsuaj thiab khawb. Yog li ntawd, cov khoom nyob rau hauv lub pwm yuav tsum tau muaj ib tug siab molding siab ua ntej lawv tag nrho solidified.
