polyurethane tonu i huaina polyurethane, he rōpū urethane ngātahi tukurua (NHCOO) pūhui macromolecular kei roto i roto i te mekameka matua. Kei te hanga te reira i te diisocyanate organic ranei pūhui polyisocyanate ki e rua, neke atu rānei polyaddition hydroxyl. Ko te tātai tauhohenga e whai ake nei: -N = C = e + HO- → -NH-COO-, i roto i te tua ki te macromolecule carbamate polyurethane, taea hoki i roto i Etere, hākawa, Urea, biuret, allophanate, me ētahi atu rōpū.
(Cyanate
Whakamārama: HOC≡N (n) cyanate HN = C = e (isocyanate) he (pai) cyanate me isocyanate rua momo. Ko te waikawa free ko te ranunga o rua, e kore wehenga tuwhera, engari ona hākawa e rua puka. Cyanate Ko wai te ahua, me te ha'iriiri. He he he kakara kaha o te waikawa ahetiki. Kiato 1.14. Kohua mata 23.6 ℃. Whakaaturia kawatanga kaha i roto i te wairewa. Iu, ngāwari polymerization. Haukini me te hauhā i hanga i roto i paparetanga. No te whakaputa carbamates me waiwaihā tūranga. (N) isocyanate ROC≡N polymerization ngāwari, me i haria ki paparetanga, i whiwhi i roto i te puka parakore uaua. Isocyanate RN = C = e ranei e = C = NRN = C = e, kakara te tikanga kino ki te wai. Ka taea te rite waikawa cyanuric Cyanate e waiariki whāwehe. )
hua polyurethane hanga ngohengohe, āhua-mārō, me te mārō pahuka, elastomers, peita, adhesives, käpia, hiako waihanga resins paninga, muka Elastomeric, whānui e whakamahia ana i roto i te pereoo ahumahi, pouaka ahumahi, transportation, metarahi hanga, hū, hiako waihanga, pueru, mīhini, matūngahinu, keri mīhini, Aerospace, hauora, ahuwhenua me te tokomaha atu mara.
Tei runga i te rerekē rauemi raw, taea whai momo rerekē o ngā hua, te tikanga e rua ngā momo o te pareaku me polyether. Ko te nuinga polyurethane Polyether faaineineraa rauemi polyurethane tautuhitia mo polyol, he polyol polyurethane rite e te katoa i te polyol polyether te nuinga o kainga i roto i te pūnaha ranei.
polyols Polyether i roto i te hanganga rāpoi, he iti, me te ngāwari ki te tītaka te pūngao ngātahi here Etere, na ko reira he rauemi polyurethane iti-pāmahana pai rite e tona mahi kareao, pai paparetanga resistance, ahakoa kahore i rite te pai rite nga āhuatanga pūkaha o pareaku polyurethane, engari pokey iti rauemi, ngāwari, me te isocyanate wae tāpiritanga tairewa, mahi tukatuka pai.
Kei te tikanga tuku polyols pareaku ki e te waikawa dicarboxylic ki te glycol me ētahi atu polyol pareaku i tōhau tauhohenga. Whānui kei roto rōpū pūhākawa (tumutumu) ranei te rōpū pākawa waro (OCOO) polyol. E whakamahia whānuitia pahuka polyurethane. Kei te nuinga whakamahia pahuka i ngohengohe mō te taonga me te waka o ngā rauemi moenga ngā, rauemi mātao; Kei te nuinga whakamahia pahuka i mārō mātao mō taputapu whare, taiepa whare waterproofing rehu pahuka i mātao, rauemi putorino mātao, hanga papa, taraka paemahana me te mātao rokiroki matao me ētahi atu rawa; pahuka i āhua-mārō e whakamahia ana i roto i te awhi mauhaa automotive, urungi wira, me te pera i runga i. He te mākete he momo o ngā mō te polyurethane pahuka i pahekotanga o rauemi (e rua-wae premix), te nuinga hoki te (rongoa matao) pahuka māia tiketike, pahuka āhua-mārō, e maka ana me te riringi kirihou pahuka i pakeke.
(Diethyl Etera
1. A, no te i hana he ranunga o te waihā me te takiwa, te waikawa pungatara ki 140 ℃ taea intermolecular hua maroketanga ki Etera. te waikawa pungatara kukū rite te kaihoko dehydrating te wahi te whakakōkī.
2. Whārite: 2 CH3-CH2-OH - catalyzed me te kukū H2SO4 → i 140 ℃ CH3-CH2-e-CH2-CH3 + H2O)
elastomer polyurethane
Polyurethane elastomer Ko te rauemi polyurethane hiato o te momo, no te mea o tona hanganga ki ngohengohe, me te pakeke wāhanga e rua, e taea te hangaia ki te hoatu rauemi rāpoi he kaha nui, taikaha, kakahu resistance, te hinu resistance, mahi pai, e rua ki te rapa he nui elasticity me te rigidity o kirihou, i huaina "rapa ātete kakahu-."
Ka taea e polyurethane elastomer whakamahi inaianei te taua mastication rapa whānui, te ranu, whakaora i tukanga niao (tirohia MPU); kia hanga hoki o te rapa wai, maka niao ranei riringi, te whakarewanga o, niao turai (tirohia ki te PTM); taea hoki te rite ki pire, me, rite kirihou noa, i werohia, Tangohanga, calendering, pupuhi niao me ētahi atu tukanga (o PTM). Niao werohia whakarewa wahi ranei, i roto i te tetahi whānuitanga o pakeke, engari ano hoki e taea te tapahia, huri, he kōhao me ētahi atu machining. Tukatuka o kanorau, te elastomer polyurethane faaohiparaa rawa whanui, tonu tono ki te whakawhānui i.
Oil ātete, ozone resistance, hoholo ātete, radiation ātete, iti pāmahana, tangi pai mārama, adhesion kaha, biocompatibility pai, me te hototahi toto. Enei painga ko te elastomer polyurethane whānui e whakamahia ana i roto i te hōia, Aerospace, Acoustics, koiora, me te tahi atu take.
Ko te painga matua o polyurethane elastomer:
1, ko te mahi o te awhe te whakarite. Ka taea te whakaritea te maha o ngā tohu mahi tinana, me te pūkaha i te kōwhiringa o ngā rauemi mata me formulations, i roto i te whānuitanga etahi, ki te whakatau i nga whakaritenga rerekē mō te mahi hua. Ko te hunga i pakeke, he maha he tohu nui o ngā kaiwhakamahi o te hua, i hanga e rua o te polyurethane elastomer Shore He pakeke o 20 na ranei awa tā ngohengohe, engari ano hoki i hanga neke atu i te 70 Shore D pakeke o rapa pakeke takai awhiowhio, ko te Elastomeric whānui tenei rauemi uaua ki te mahi. Polyurethane elastomer Ko te rauemi polymer neke tito o maha wāhanga me wāhanga pakeke tito o mekameka hangore, me te whakapai ake, me te hua o te neke rōpū kiato wāhanga pakeke rahi o elastomer kaha taketake, me te pakeke ka kia nui haere i runga i.
2, ātete kākahu pai. Ngā wahi i reira he wai, te hinu mākū, reo tikanga mahi ngā, ko maha te ātete kākahu e rave rahi mau taime ki rave rahi taime i te rauemi rapa noa. rauemi konganuku pērā i maitai, ahakoa rawa pakeke, engari e kore e tika kakahuria e, pērā i papu nui wāhi irrigation o te awa Kōwhai, te mowhiti wāhanga tiaki overcurrent me whakarewa mangai mowhiti i muri i te rota o te parataiao horo, e kore e tango i rau o haora ki nui kakahu leakage, i te whakamahi o te polyurethane elastomer pani mangai mowhiti me tiaki mowhiti he mahi tonu 1800 ki te iti kakahu ano. Etahi, pērā i mīhini raihi mira rapa whakamahia takai hulling, wiriwiri tatari mata Coal takanga me te ara taiwhanga runway, whakamahia kekeno hinu hihiri Forklift warou ararewa wira me te wira takai te Roha, etc. e hoki polyurethane elastomer mai te reira i roto i. I roto i tenei wāhi tohutoro ko e hiahiatia ana ki te whakapai ake i te whakarea o te waku o te iti-pakeke mema polyurethane elastomer, ki te whakapai ake kakahu ātete i raro i kawenga whanau, ka taea e koe te tāpiri i te nui iti o te konumohe disulfide, graphite hinu silicone ranei i roto i te taua elastomer polyurethane, etc. hinu.
wā Post: Whiringa-24-2018