Pulasitiki ya Polyurethane (PU)
* Polyurethane (PU) ndi chidule cha polyurethane, polyisocyanate ndi polyhydroxy polymer polymerization, yomwe ili mu unyolo waukulu wa ma polima okhala ndi magawo ambiri obwerezabwereza a urethane chain (-NHCOO-) a ma polymer compounds.
* Zopangidwa ndi pulasitiki za PU zopangidwa mwamakonda
Polyurethane, yomwe imadziwikanso kuti polyurethane ndi polyurethane, ndi gulu la ma macromolecules okhala ndi urethane mu unyolo waukulu. Mtundu uwu wa zinthu za polima uli ndi kusinthasintha kwa mphira komanso mphamvu komanso magwiridwe antchito abwino kwambiri a pulasitiki, ndipo umagwiritsidwa ntchito kwambiri m'magawo asanu ndi awiri akuluakulu a pulasitiki, rabara, thovu, ulusi, zokutira, zomatira ndi ma polima ogwira ntchito. M'mafakitale imagwiritsidwa ntchito kwambiri m'matayala otsika liwiro, ma gasket, mphasa zamagalimoto ndi zina. M'moyo watsiku ndi tsiku, polyurethane imagwiritsidwa ntchito popanga mitundu yosiyanasiyana ya thovu ndi siponji ya pulasitiki.
Kodi mungapange chiyani ndi PU Plastiki?
Ma elastomer a polyurethane ndi gulu la zipangizo zomwe zili ndi mphamvu zonse ziwiri za rabara ndi pulasitiki, zomwe zimakhala ndi mphamvu yabwino yokoka, mphamvu yong'ambika, kukana kugwedezeka, kukana kukwawa, kukana nyengo, kukana hydrolysis, kukana mafuta ndi zina zabwino.
Amagwiritsidwa ntchito makamaka ngati zinthu zomangira (monga mapayipi, ma gasket, malamba, ma rollers, magiya, mapaipi, ndi zina zotero), zotetezera kutentha, nsapato zopondera ndi matayala olimba. Mwachitsanzo, ngati mbale yosungiramo zinthu zomangira, imakhala ndi phokoso lochepa, imalowa mosavuta komanso imakana kuwonongeka kuposa mbale yachitsulo yachikhalidwe. Kuphatikiza apo, polyurethane ili ndi biocompatibility yabwino kwambiri, ngati chinthu chogwiritsidwa ntchito pazamankhwala, ingagwiritsidwe ntchito mu pacemakers, mitsempha yamagazi yopangidwa, mafupa opangidwa, ndi zina zotero.
Nazi zina mwa ntchito za Polyurethane (PU)
- Mayendedwe
- Ntchito yomanga
- Makina
- Zipangizo zamagetsi
- Mipando
- Kukonza Chakudya
- Nsalu ndi zovala
- Chikopa chopangidwa
- Kusindikiza
- Makampani opanga mafuta
- Masewera
- Chisamaliro chamoyo
Makhalidwe a Polyurethane (PU)
* Thovu la polyurethane limagawidwa m'mitundu iwiri: thovu lolimba ndi thovu losinthasintha, lokhala ndi kusinthasintha kwabwino, kutalika, mphamvu yokakamiza komanso kusinthasintha, komanso kukhazikika kwa mankhwala. Kuphatikiza apo, thovu la polyurethane lili ndi kuthekera kokonza, kumamatira, kutchinjiriza ndi zinthu zina, zomwe zimapangitsa kuti zinthu zotetezera zikhale bwino.
Chifukwa cha kapangidwe kake, elastomer ya polyurethane ili ndi zigawo zofewa komanso zolimba za unyolo wa 2, kotero unyolo wa mamolekyu ukhoza kupangidwa kuti upatse zinthuzo mphamvu zambiri, kulimba bwino, kukana kutha, kukana mafuta ndi zina zabwino kwambiri, zomwe zimadziwika kuti "raba yosatha kutha" polyurethane nthawi imodzi ndi kulimba kwa rabara komanso kulimba kwa pulasitiki.
* Zipangizo za polyurethane zimakhala ndi polarity yamphamvu, zomwe zimapangitsa kuti zigwirizane bwino ndi zinthu zambiri ndipo zingagwiritsidwe ntchito ngati zomatira m'munda wolumikizirana.
* Ma glue a polyurethane amagwiritsidwa ntchito kwambiri m'mafakitale opaka, omanga, amatabwa, magalimoto, ndi opanga nsapato.
Kodi zinthu za Polyurethane (PU) zimapangidwa bwanji?
Chifukwa cha kusagwirizana kwamphamvu kwa polyurethane ndi madzi, njira yatsopano yopangira PU emulsion iyenera kugwiritsidwa ntchito, njira yopangira PU emulsion imapangidwa makamaka motere: ① ndi oligomer polyol, chain extender, diisocyanate kuti apange molekyulu yambiri ya PU pre-polymer; ② imachotsedwa pambuyo pa pre-polymer emulsified m'madzi kuti ipange dispersion.
Njira zokonzekera emulsion ya polyurethane zili ndi magulu awiri akuluakulu: njira yakunja ya emulsification ndi njira yamkati ya emulsification.
1. Njira yopangira emulsification yakunja ndi njira yopangira emulsification yokakamiza pamaso pa emulsifier, high shear.
2. Njira yodzipangira yokha imachitika poika magulu okonda madzi m'maselo a polyurethane.
Magulu okonda madzi amalowa m'mafupa a PU molecular mwa kukulitsa unyolo wa ma monomers okonda madzi, omwe amapangidwa ndi magulu opanga mchere ndi ma reagents opanga mchere.
Kubwezeretsanso pulasitiki ya Polyurethane (PU)
- Kubwezeretsanso Mapulasitiki a Polyurethane (PU) Kungagawidwe m'magulu awiri: kubwezeretsanso zinthu zakuthupi ndi mankhwala.Kubwezeretsanso zinthu zakuthupi kumapereka njira yothandiza komanso yotsika mtengo yobwezeretsanso thovu lolimba la polyurethane ndi zinthu zopangidwa ndi thovu. Kukula kwa tinthu tating'onoting'ono ta thovu la polyurethane choyambirira kumachepetsedwa kufika pa muyezo womwe ungakonzedwenso mu njira zina. Zinyalala zobwezerezedwanso, kapena zodulidwa kuchokera ku njira yopangira, zimawonongeka kukhala mitundu yothandiza kwambiri monga ma flakes, granules kapena ufa.Kubwezeretsanso mankhwala ndi njira yogawa thovu la polyurethane kukhala zinthu zopangira polyurethane kapena zinthu zina zopangira mankhwala pogwiritsa ntchito alcoholysis, amineysis, hydrolysis kapena pyrolysis. Thovu la polyurethane lili ndi urethane ndi urea bonds. Mu njira ya alcoholysis, aminolysis ndi alkali hydrolysis, urethane ndi urea bonds mu polyurethane molecule zimasweka ndikusungunuka kukhala polyols, aromatic polyamines, carbon dioxide ndi zina zotero.
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