Plastics yog cov tebchaw macromolecular (macromolecules) uas yog polymerized los ntawm kev ntxiv polymerization lossis polycondensation cov tshuaj tiv thaiv. Lawv hu ua plastics lossis reins. Lawv tuaj yeem hloov pauv hauv cov khoom ua ke thiab cov duab, ntawm cov khoom cua thiab cov fillers. Nws yog tsim los ntawm additives xws li cov yas yas, cov stabilizers, lubricants thiab colorants.
Lub ntsiab tivthaiv ntawm cov yas yog cob. Lub sij hawm rein yog lub npe hu ua tom qab lipids secreted los ntawm cov nroj tsuag thiab tsiaj, xws li rosin, shellac, thiab lwm yam. Resin hais txog lub khob tshuaj polymer uas tsis tau muab sib xyaw nrog ntau yam khoom siv. Roj nyiaj rau li 40% txog 100% ntawm qhov hnyav tag nrho ntawm cov yas. Cov khoom ntawm cov yas yooj yim yog txiav txim siab los ntawm cov khoom ntawm lub pob, tab sis cov khoom siv kuj yog ib qho tseem ceeb. Qee cov khoom yas yog tsim los ntawm cov khoom cua tawv, los yog tsis muaj cov additives, xws li cov pleev xim, cov pob zeb, thiab cov zoo li.
Lub npe hu ua yas, qhov tseeb, nws yog ib hom khoom hluavtaws, cov duab zoo ib yam li cov ntoo thooj hauv qhov ntuj tsim, thiab nws yog hu ua yas los ntawm cov tshuaj synthesis.
Thermoplastic
Raws li peb txhua tus paub, plastics yog muab faib rau thermoplastics thiab thermosetting plastics raws li lawv lub cev nqaij thiab tshuaj. Muaj ntau cov khoom ua ntej cov thermosetting uas plastics tau nrov ua ntau yam. Hnub no, dab tsi yog qhov loj thermoplastics rau txhua tus neeg?
Thermoplastic yog hais txog ib lub hnab yas uas muaj cua kub thiab txias zog. Feem ntau cov khoom uas peb siv hauv peb lub neej txhua hnub poob rau hauv pawg no. Nws ua kom muag thiab txawm ntws thaum kub, thiab txias zuj zus. Txoj kev no yog rov qab los thiab rov tuaj yeem rov qab ua dua.
Yeej tsis yooj yim
Thermoplastics yog ib lub plastics uas siv ntau tshaj plaws. Lawv ua rau cov khoom siv nrog cov khoom loj ntawm thermoplastic resins thiab ntau yam khoom siv ntxiv. Nyob rau qee qhov kub thiab txias, lub hnab yas tau los yaug los ua kom zoo li qub, thiab qhov zoo li tsis hloov pauv tom qab txias; lub xeev no tuaj yeem rov ua ntau lub sij hawm thiab ib txwm muaj cov khoom qub, thiab qhov no rov qab yog qhov hloov lub cev, thiab cov yas hu ua thermoplastic. yas.
Polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyamide, acrylic yas, lwm cov polyolefins thiab copolymers thereof, polysulfone, polyphenylene ether.
