Kodi Polyvinyl Chloride (PVC) ndi yotani?

Zina mwa zinthu zofunika kwambiri za Polyvinyl Chloride (PVC) ndi izi:

1. Kuchulukana:PVC ndi yokhuthala kwambiri poyerekeza ndi mapulasitiki ambiri (mphamvu yokoka yozungulira 1.4)
2. Zachuma:PVC imapezeka mosavuta komanso yotsika mtengo.
3. Kuuma:PVC yolimba imapambana bwino chifukwa cha kuuma ndi kulimba.
4. Mphamvu:PVC yolimba ili ndi mphamvu yabwino kwambiri yokoka.

Polyvinyl Chloride ndi chinthu cha "thermoplastic" (mosiyana ndi "thermoset"), chomwe chimagwirizana ndi momwe pulasitiki imayankhira kutentha. Zipangizo za thermoplastic zimakhala zamadzimadzi pamalo awo osungunuka (mtundu wa PVC pakati pa madigiri 100 Celsius otsika kwambiri ndi mitengo yapamwamba monga madigiri 260 Celsius kutengera zowonjezera). Chinthu chofunikira kwambiri pa thermoplastics ndichakuti zimatha kutenthedwa kufika pamalo awo osungunuka, kuzizidwa, ndikutenthedwanso popanda kuwonongeka kwakukulu. M'malo moyaka, thermoplastics monga polypropylene liquefy imalola kuti ziwumbidwe mosavuta kenako nkubwezerezedwanso. Mosiyana ndi zimenezi, thermoset plastics imatha kutenthedwa kamodzi kokha (nthawi zambiri panthawi yopangira jakisoni). Kutentha koyamba kumapangitsa kuti zinthu za thermoset zikhazikike (mofanana ndi epoxy ya magawo awiri), zomwe zimapangitsa kuti kusintha kwa mankhwala kusinthe. Ngati mutayesa kutentha pulasitiki ya thermoset kufika kutentha kwakukulu kachiwiri, zimangoyaka. Khalidweli limapangitsa kuti zinthu za thermoset zisagwiritsidwenso ntchito.

PVC imapereka ntchito zosiyanasiyana komanso zabwino m'mafakitale osiyanasiyana m'njira zake zolimba komanso zosinthasintha. Makamaka, PVC yolimba imakhala ndi pulasitiki yambiri, zomwe zimapangitsa kuti ikhale yolimba kwambiri komanso yolimba kwambiri. Imapezekanso mosavuta komanso yotsika mtengo, yomwe, kuphatikiza ndi mawonekedwe ambiri a pulasitiki, imapangitsa kuti ikhale yosankha yosavuta pamafakitale ambiri monga zomangamanga.

PVC ndi yolimba kwambiri komanso yopepuka, zomwe zimapangitsa kuti ikhale yokongola kwambiri pa ntchito zomanga, mapaipi, ndi mafakitale ena. Kuphatikiza apo, kuchuluka kwa chlorine komwe imapanga kumapangitsa kuti ikhale yosapsa ndi moto, chifukwa china chomwe yatchuka kwambiri m'mafakitale osiyanasiyana.