Lub raj mis yas manufacturers qhia rau koj tias muaj ntau hom yas. Txog niaj hnub no, muaj ntau dua 300 hom yas tso rau hauv kev tsim khoom. Muaj ntau txoj hauv kev los faib cov hwj yas rau hauv ob pawg:

1. Cov tuam txhab lub raj mis yas tau muab faib ua cov thermoplastic thiab thermosetting plastics raws li cov khoom sib txawv ntawm lub raj mis yas thaum raug tshav kub.

Cov qauv molecular ntawm thermoplastic yas yog linear. Thaum rhuab, nws softens los yog melts. Nws tuaj yeem raug molded rau hauv cov duab txheeb ze thiab tom qab ntawd hardened tom qab txias. Tom qab ob peb qhov txias txias, nws tuaj yeem ua kom mos los ntawm cua sov dua. Piv txwv xws li polyvinyl chloride, polyethylene thiab polystyrene. Thermoplastics yog qhov yooj yim rau pwm, tuaj yeem tsim tsis tu ncua thiab muaj lub zog txhua yam, yog li kev loj hlob sai.

Cov qauv molecular ntawm thermosetting plastics yog intrinsically qauv, uas softens thaum rhuab thiab tuaj yeem txiav kom zoo. Txawm li cas los xij, thaum rhuab mus rau qhov tsim nyog los yog thaum me me ntawm tus neeg sawv cev kho ntxiv, nws hardens thiab solidifies thiab tsis soften thiab hloov cov duab thaum rhuab dua. Thermoset plastics, xws li phenolic, amino thiab epoxy resins, tsis tuaj yeem siv dua vim tias lawv tsis muag thaum cua sov. Thermosetting plastics yog qhov nyuaj rau pwm thiab muaj cov teeb meem sib txawv hauv kev tsim khoom tas mus li, tab sis lawv muaj cua sov resistant, tsis yooj yim deformed thiab pheej yig.

2. Cov tuam txhab tsim lub raj mis yas tau muab faib ua cov yas dav dav thiab cov yas engineering raws li qhov sib txawv ntawm kev siv lub raj mis yas.

Cov yas dav dav yog cov yas uas muaj cov ntim ntau lawm, tus nqi qis thiab ntau yam kev siv, feem ntau suav nrog polyolefins, polyvinyl chloride, polystyrene, phenolic plastics, amino plastics, thiab lwm yam. Ntau yam khoom uas tib neeg siv hauv lawv lub neej txhua hnub yog tsim los ntawm cov hom phiaj dav dav. yas.

Engineering plastics tuaj yeem siv los ua cov khoom siv engineering los tsim cov khoom siv tshuab tsis yog hlau. Xws li polyamide, polycarbonate, polyformaldehyde, cov khoom siv hluav taws xob tsis muaj zog, polyimfories, zoo hluav taws xob rwb thaiv tsev zog, kev ua tau yooj yim thiab lwm yam ntxwv. Lawv yog siv nyob rau hauv ntau yam kev lag luam xws li tsheb, khoom siv hluav taws xob, tshuaj, machinery, twj thiab meters, nrog rau aerospace navigation, foob pob ua ntxaij thiab missiles.