Kodi thermoplastics ndi chiyani?
Thermoplastics ndi gulu la mapulasitiki omwe ali pulasitiki pa kutentha kwina, amalimbitsa pambuyo pozizira, ndipo akhoza kubwereza ndondomekoyi. Mapangidwe a mamolekyuwa amakhala ndi mzere wozungulira polima, womwe nthawi zambiri ulibe magulu ogwira ntchito, ndipo sukumana ndi ma intermolecular crosslinking ukatenthedwa. Zinyalala zitha kukonzedwanso kukhala zatsopano pambuyo pozikonzanso. Mitundu yayikulu ndi ma polyolefins (vinyls, olefins, styrenes, acrylates, olefins okhala ndi fluorine, etc.), cellulose, polyether polyesters ndi Aromatic heterocyclic polima, etc.
Tanthauzo
Thermoplastics ndi mapulasitiki omwe amagwiritsidwa ntchito kwambiri. Amapangidwa ndi utomoni wa thermoplastic monga chigawo chachikulu ndi zowonjezera zosiyanasiyana. Pazikhalidwe zina za kutentha, mapulasitiki amatha kufewetsa kapena kusungunuka mu mawonekedwe aliwonse, ndipo mawonekedwewo amakhalabe osasintha pambuyo pozizira; chikhalidwe ichi chikhoza kubwerezedwa kangapo ndipo nthawi zonse chimakhala ndi pulasitiki, ndipo kubwereza uku ndikungosintha kwa thupi, komwe kumatchedwa thermoplastic. pulasitiki.
Kuphatikizapo polyethylene, polypropylene , polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyamide, acrylic plastics, polyolefins zina ndi ma copolymers awo, polysulfone, polyphenylene ether
Gulu Lamapangidwe
Ma thermoplastics amatha kugawidwa m'mapulasitiki ogwiritsidwa ntchito wamba, mapulasitiki opangira uinjiniya, ndi mapulasitiki apadera malinga ndi momwe amagwirira ntchito, ntchito zosiyanasiyana, komanso kusinthasintha kwaukadaulo wakuumba.
Makhalidwe akuluakulu a mapulasitiki azinthu zambiri ndi awa: kugwiritsa ntchito kwakukulu, kukonza kosavuta, ndi ntchito yabwino yokwanira. Monga polyethylene (PE)polyvinyl kolorayidi (PVC), polypropylene (PP), polystyrene (PS), acrylonitrile-butadiene-styrene (ABS) amadziwikanso kuti "mapulasitiki asanu a cholinga chachikulu".
Makhalidwe a mapulasitiki a uinjiniya ndi mapulasitiki apadera ndi awa: zomanga zina ndi katundu wa ma polima apamwamba ndizopambana kwambiri, kapena ukadaulo wopangira ukadaulo ndizovuta, ndi zina zambiri, ndipo nthawi zambiri amagwiritsidwa ntchito muukadaulo waukadaulo kapena magawo apadera ndi zochitika. Mapulasitiki akuluakulu aumisiri ndi: nayiloni (nayiloni), polycarbonate (PC), polyurethane (PU), polytetrafluoroethylene (Teflon, PTFE), polyethylene terephthalate (PET), etc., Mapulastiki apadera monga "ma valve opangidwa ndi mtima" ndi "zolumikizana zopangira" monga "ma polima azachipatala".
