Kev cais thiab kev sib txawv ntawm cov khoom yas
(一) Muab faib ua ntej raws li kev ua tau zoo thiab siv Plastics tuaj yeem muab cais ua feem plastics thiab engineering plastics raws li kev ua tau zoo thiab siv. Khoom yas yog hais txog cov khoom siv dav dav. Nws muaj ntau yam kev siv, cov zis loj, thiab luv nqi. Nws yog yas uas siv hauv tsev. Engineering yas yog hais txog cov polymers uas muaj zog dua txhua yam khoom qub thiab lwm yam khoom tshwj xeeb.
(二) Raws li kev faib tawm ntawm thermal cov khoom ntawm plastics Plastics yuav faib ua thermoplastic thiab thermosetting plastics raws li nyias thermal thaj chaw. Cov kev hloov uas tshwm sim thaum lawv cov cua sov yog txawv, thiab lawv cov hluav taws kub ua hauj lwm, lub zog, thiab kev nruj nruj yog txawv.
Cov thermoplastic mos los yog yaj thaum nws ua kom sov, thiab tawv tawv thiab poob tom qab txias. Tsis muaj tshuaj hloov hauv cov txheej txheem ua mob khaub thuas lossis kub. Qhov kev ua tau zoo no txawm tias tsis muaj pes tsawg lub sij hawm cua sov thiab cua txias dua. Yog li no, txoj kev ua tus qauv yog yooj yim thiab muaj cov khoom vaj khoom tsev ntau dua. , tab sis qhov kub tiv thaiv thiab rigidity yog cov neeg pluag. Cov resins nyob rau hauv thermoplastics yog tag nrho cov txheej txheem tawm qauv, nrog rau tag nrho cov polymeric resins thiab cov hws ib nrab. Feem ntau hom yog polyethylene, polypropylene, polystyrene, polyvinyl chloride, polymethyl methacrylate, ABS yas, poly. Amide, polyoxymethylene, polycarbonate, polyphenylene oxide, lwm yam zoo li
Thaum lub sij hawm ua cov thermosetting plastics, lawv softened los ntawm tshav kub, ces solidified, hardened, thiab tsis tau softened. Tshuaj hloov tau tshwm sim thaum lub sijhawm ua haujlwm. Kev sib xyaw ua ke molecules ua tus tsim kom muaj ib qho kev ua haujlwm loj thiab ua rau cov ntaub ntawv tsis raug thiab tsis muaj teeb meem. Thaum tshav kub kub thiab qhov nruj nyav yog qhov zoo, tab sis txhua yam muaj zog heev. Feem ntau ntawm cov khoom uas ua los ntawm cov kab xoos tuaj yeem yog cov thermosetting, thiab cov khoom xws li phenolics, epoxies, amino resins, unsaturated polyesters, thiab polysilicone resins yog cov no.
