Me pehea te tautuhi i te kiriata PE me te kiriata PVC i roto i te tikanga noa, i ia ra ranei?
Ko te mea e rapu ana koe ko te whakamatautau Beilstein.Ka whakatauhia te aroaro o te PVC ma te kite i te aroaro o te maota.Ka hiahia koe ki te rama propane (te tahu Bunsen ranei) me te waea parahi.Ko te waea parahi anake ka mura noa engari ka honoa ki tetahi mea he maota (PVC) ka wera te kakariki.Whakawerahia he waea parahi ki runga i te mura (whakamahia te kumara hei tiaki i a koe me te waea roa) hei tango i nga toenga kore.Pēhia te waea wera ki tō tauira kirihou kia rewa ai ētahi ki runga i te waea kātahi ka whakakapihia te waea kirihou kua uhia ki runga i te mura ka titiro kei te kanapa te kākāriki.Mena he kakariki kanapa, he PVC koe.
Ka mutu, ka wera te PE me te hongi ano he ware pi i te mea he haunga matū tino kaha te PVC, ka tineia tonu ina tangohia atu i te mura.
"He rite te polyethylene ki te PVC?"Kao.
Ko te Polyethylene karekau he maota i roto i te ngota, ko te PVC.Ko te PVC he polyvinyl whakakapi maota, kaore he polyethylene.Ko te PVC he tino pakari ake i te polyethylene.CPVC noa atu.Ka rewa te PVC ki roto i te wai i te roanga o te waa he paitini, karekau te polyethylene.Ka pakaru te PVC i raro i te pehanga nui (no reira kaore e pai mo nga tono hau kōpeke), kaore te polyethylene.
Ko nga mea e rua he kirihou whakamaoriori.
He polyethylene te PVC?
Ko te PVC, ko te polyvinyl chloride ranei, he polyethylene whakakapi.Ko te tikanga ko ia atu waro o te mekameka kotahi te maota e piri ana me te hauwai, kaua ki nga hauwai e rua e kitea ana i runga i te polyethylene.
He aha te kirihou polyethylene i hangaia mai i te aha?
Ethylene
Ko te Polyethylene (PE), he maamaa, he maha nga kapia waihanga i hangaia mai i te polymerization o te ethylene.Ko te Polyethylene he mema o te whanau nui o nga kapia polyolefin.
He aha te polyethylene hono ripeka?
Ko te polyethylene he waiwaro mekameka roa ka hangaia e te hononga raupapa o nga ngota ngota ethylene i roto i te tauhohenga e kiia nei ko te polymerization.He maha nga huarahi hei whakahaere i tenei tauhohenga polymerization.
Mēnā ka whakamahia he whakakōkī parakore-Ti (Ziegler polymerization), he ngawari nga tikanga tauhohenga, a, ko te polymer ka puta ko te ahua o nga mekameka waiwaro kukū roa rawa atu me te iti rawa o te koretake (nga roopu -CH=CH2 kore-makuku) hei waahanga ranei. o te mekameka, hei roopu tarewa ranei.Ko tenei hua ka kiia ko High Density Polyethylene (HDPE).Ahakoa ka whakauruhia nga momo-monomers penei i te 1-butene, he iti noa te taumata o te koretake i roto i te polymer hua (LLDPE).
Mēnā ka whakamahia he whakakōkī pararopi i runga i te Chromium Oxide, ka hanga ano nga mekameka waiwaro raina roa, engari ka kitea etahi taumata o te korenga.Ko te HDPE ano tenei, engari me te manga-roa.
Mena ka whakahaerea te polymerization, he waahi mo nga mekameka-taha-roa i roto i te polymer, me etahi waahi o nga roopu -CH=CH2 kaore i te haunga hei waahanga o te mekameka.E mohiotia ana tenei kapia ko LDPE.He maha nga monomers penei i te vinyl acetate, te 1-butene me te dienes ka taea te whakauru ki te whakarereke me te mahi i te mekameka waiwaro, me te whakauru ano i etahi atu haunga ki roto i nga roopu tarewa.
Ko te LDPE, na te mea he nui te taumata o te kikokore, he mea matua mo te hono-whakawhiti.He tukanga tenei ka mahia i muri i te whakaritenga o te polymer raina tuatahi.I te wa e konatunatua ana te LDPE ki nga kaiwhakangungu tuwhena kore utu motuhake i te teitei o te mahana, ka honoa e ia nga momo mekameka ma te "whakawhitiwhiti" ma.nga mekameka taha haunga.Ka puta mai he hanganga tuatoru (hanganga ahu-3) he "totoka" ake.
Ka whakamahia nga tauhohenga honohono ki te "whakatakoto" i tetahi ahua motuhake, hei totoka, hei pahuka ranei, timata mai i te polymer ngawari, ngawari te hapai.He rite ano te tikanga o te whakawhiti hononga i roto i te "whakapaura" o te rapa, i reira ka hangaia he polymer raina mai i te polymerization isoprene ki te hanga 3-ahu totoka ma te whakamahi whanariki (S8) hei kaihoko hei here i nga momo mekameka.Ka taea te whakahaere i te tohu o te hononga whakawhiti ki te tuku i nga whaainga motuhake ki nga ahuatanga o te polymer ka puta.
Wā tuku: Oketopa-11-2022