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. Nws cov txheej txheem molding yog muab faib ua casting molding thiab molding. Kev tsim cov khoom siv phenolic kev sib txhuam txais cov txheej txheem kub nias. Phenolic compression plastics yog kho nyob rau hauv tshav kub thiab siab rau ob qho laj thawj. Thawj yog qhov fluidity ntawm cov yas nias. Hauv kev tsim cov ntaub ntawv sib txhuam, txhawm rau kom tau txais qhov kev sib txhuam uas yuav tsum tau ua thiab kev siv lub zog ntawm cov khoom sib txhuam, feem ntau nyob rau hauv cov txheej txheem tsim, qhov ntau npaum li cas ntawm cov fillers thiab fiber ntau cov ntaub ntawv yuav tsum suav txog 80 feem pua rau 90 feem pua , thaum noj ntau npaum li cas. ntawm resin binders tsuas yog 80 feem pua rau 90 feem pua. Nws suav txog 10 feem pua mus rau 20 feem pua , yog li cov fluidity ntawm cov yas nias yog qhov tsis zoo. Yog tias siv cov txheej txheem molding, nws tsis tuaj yeem ua kom cov yas nias ntim cov kab noj hniav kom tau txais cov khoom pwm.
Peb feem ntau yuav tsum tau siv cov txheej txheem cua sov thiab siab molding, kom cov yas compressed ntws nyob rau hauv ib tug tej yam siab nyob rau hauv pwm kab noj hniav rhuab mus rau lub curing kub (170 ~ 180 ° C), nyob rau hauv lub pwm kab noj hniav, thiab yog kho los ntawm tshav kub, thiaj li tau txais kev kho molding. 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, thiab maj mam hloov los ntawm cov qauv linear los yog cov qauv ceg mus rau peb-dimensional cross-linked network qauv, thiab thaum kawg ua tiav kev kho. Thaum lub sijhawm txheej txheem no, cov resin yuav tso cov dej noo thiab lwm yam khoom tsis muaj molecular, uas yuav ua rau lub zog loj ntawm lub molding kub (150 degree). Yog hais tias nws khiav tawm ntawm qhov chaw ntawm cov khoom molded, cov khoom yuav puas thiab scrapped. Yog li ntawd, cov khoom nyob rau hauv cov pwm yuav tsum tau tswj lub siab molding siab ua ntej nws yuav kho tau tag nrho.
Cov yam ntxwv ntawm cov txheej txheem thermoforming yog tias compression molding thiab kub kho ntawm cov yas compressed yog nqa tawm ib txhij nyob rau hauv lub compression pwm.
