1 Hom yas
(1) Raws li cov yam ntxwv ntawm kev siv, plastics yog cais rau hauv dav dav yas, engineering plastics thiab cov khoom tshwj xeeb. Cov khoom siv dav dav yog hais txog cov khoom uas muaj cov zis loj, cov ntaub ntawv dav dav, cov duab zoo thiab tsis tshua muaj nqi, xws li polyethylene, polypropylene, phenolic thiab lwm yam. Engineering plastics yuav dais ib yam quab yuam sab nraud, muaj cov khoom sib xyaw zoo thiab kub thiab tsis kub, thiab muaj kev ruaj ntseg zoo. Nws tuaj yeem siv ua engineering plastics, xws li polyamide thiab polysulfone. Cov khoom tshwj xeeb muaj kev tshwj xeeb xws li fluoroplastics thiab silicones.
(B) Raws li lub cev thiab tshuaj muaj zog, nws muab faib ua cov thermosetting plastics thiab thermoplastics. Cov khoom uas muaj hluav taws xob yog cov uas kho los yog muaj cov khoom tsis haum (yaj) rau hauv tshav kub los yog lwm yam mob. Qhov zoo ntawm thermosetting plastics yog tias lub zog thiab kev kub ntawm lub cev ua haujlwm tsis zoo, thiab qhov tsis muaj kev yooj yim tsis yooj yim; qhov tsis zoo yog tias txoj kev molding yog qhov nyuaj thiab qhov ua tau zoo yog qhov tsawg. Thermoplastic yog hais txog ib lub hnab yas uas pheej yig dua thiab txias thiab khov kho hauv ib qho kev kub. Tus qauv hluav taws xob muaj qhov zoo ntawm cov txheej txheem yooj yim molding, khoom lag luam siab, tej yam khoom siv dag zog, thiab siv ub pom dua; qhov tsis zoo yog qhov tsis ua kom kub thiab tsis yeem.
2 cov khoom xyaw yas
Cov yas yog tsim los ntawm hluavtaws cob, thiab ib qho tsim nyog ntxiv cov khoom ntxiv yog ntxiv rau kev ua kom tus txheej txheem thiab kev ua tau zoo. Additives xws li: fillers thiab reinforcing materials, fillers, plasticizers, tua cov neeg ua hauj lawm, stabilizers, lubricants, antistatic cov neeg ua hauj lawm, nplaim hluav taws, thiab cov zoo li.
3 hloov kho yas
Cov yam ntxwv ntawm cov khoom lag luam yog tsi ntsees los ntawm lub cev nyhav, tsis muaj xeb, kev ua haujlwm tsis zoo, zoo siab, zoo coj los tiv thaiv thiab tiv thaiv, tsis thermal conductivity, zoo formability thiab xim tawv nqaij, ua cov nqi qis, thiab lwm yam. Kev siv ntau lub plastics Ua raws nraim li cov qauv uas tsim rau lub tsheb, namely, hnav, ruaj, anti-corrosion, zoo nkauj tsos thiab kev nplij siab, thiab lwm yam zoo li, thiab pab kom txo cov nqi thiab txuag khoom. Txawm li cas los xij, vim muaj kev ruaj ntseg ntawm qhov tsis zoo ntawm cov khoom qub, qhov loj thermal expansion, yooj yim burning, thiab kev laus, ntau yam ntxwv tsis muab piv nrog cov khoom hlau. Yog li no, cov yas siv hauv tsheb tsis yog tib hom, tab sis yog hloov, kuj hu ua "modified plastic."
