1. Tirohanga Whānui
I te tere o te whanaketanga o te hangarau mōhiohio me te whakawhitiwhiti kōrero, kua piki haere ngā whakaritenga mō te mahi me te kounga o ngā taura whatu, hei kaikawe matua mō te tuku mōhiohio o ēnei rā.Te Polybutylene terephthalate (PBT), hei kirihou hangarau thermoplastic me te mahi whānui tino pai, he mahi nui tāna i roto i te hanga taura whatu. Ka hangaia te PBT mā te polymerization condensation o te dimethyl terephthalate (DMT) te waikawa terephthalic rānei (TPA) me te butanediol i muri i te esterification. Ko tētahi o ngā kirihou hangarau whānui e rima, ā, i whakawhanakehia tuatahitia e GE me te ahumahi i te tekau tau atu i 1970. Ahakoa i tīmata i muri tata mai, kua tino tere te whanaketanga. Nā te pai o te mahi whānui, te kaha o te tukatuka me te utu nui, he whānui te whakamahinga i roto i ngā taputapu hiko, ngā motuka, ngā whakawhitiwhiti kōrero, ngā taputapu kāinga me ētahi atu mara. Ina koa i roto i te hanga taura whatu, ka whakamahia nuitia i roto i te hanga ngongo muka whatu, ā, he momo rauemi taura mahi-teitei tino nui i roto i ngā rauemi mata o ngā taura whatu.
He polyester mā-miraka, āhua mārama, āhua koretake te PBT, he ātete wera me te pumau tukatuka pai rawa atu. Ko tōna hanganga ngota ko [(CH₂)₄OOCC₆H₄COO]n. Ki te whakatauritea ki te PET, e rua atu ngā rōpū methylene i roto i ngā wāhanga mekameka, e hoatu ana ki tōna mekameka ngota matua he hanganga porowhita me te ngāwari ake. Kāore te PBT e ātete ki ngā waikawa kaha me ngā kawakore kaha, engari ka taea te ātete ki te nuinga o ngā whakarewa waro, ā, ka pirau i ngā pāmahana teitei. Nā ōna āhuatanga ā-tinana pai rawa atu, te pumau matū me te mahi tukatuka, kua noho te PBT hei rauemi hanganga pai rawa atu i roto i te umanga taura whatu, ā, e whakamahia whānuitia ana i roto i ngā hua PBT maha mō ngā taura whakawhitiwhiti kōrero me ngā taura whatu.
2. Ngā Āhuatanga o ngā Rauemi PBT
Ko te PBT he mea whakamahi i roto i te āhua o ngā ranunga kua whakarerekētia. Mā te tāpiri i ngā ārai mura, ngā kaihoko whakapakari me ētahi atu tikanga whakarerekētanga, ka taea te whakapai ake i tōna ātete wera, te ārai hiko me te urutau tukatuka. He kaha miihini teitei te PBT, he pakari pai me te ātete kakahu, ā, ka taea te tiaki pai i ngā muka whatu i roto i te taura whatu mai i te kino o te ahotea miihini. Hei tētahi o ngā rauemi mata noa mō ngā taura whatu, ka whakarite te kapia PBT kia pai te ngāwari me te pumau o ngā hua taura whatu, me te pupuri tonu i te kaha hanganga.
I taua wā anō, he kaha tōna pumau matū, ā, ka taea te ātete ki ngā momo waikura, e whakarite ana i te pumau o te mahi a ngā taura whatu mō te wā roa i roto i ngā taiao uaua pēnei i te haumākū me te rehu tote. He tino pai te pumau o te pāmahana o te rauemi PBT, ā, ka taea te pupuri i te mahi pumau ahakoa i roto i ngā taiao pāmahana teitei, e pai ai mō ngā tono taura whatu i roto i ngā rohe pāmahana rerekē. He tino pai te mahi tukatuka, ā, ka taea te hanga mā te extrusion, te werohanga pokepoke me ētahi atu tikanga. He pai mō ngā huihuinga taura whatu o ngā āhua me ngā hanganga rerekē, ā, he kirihou hangarau mahi teitei e whakamahia whānuitia ana i roto i te hanga taura.
3. Te Whakamahinga o te PBT i roto i ngā Taura Whatu
I roto i te tukanga hanga taura whatu, ka whakamahia te PBT i te nuinga o te wā ki te hanga ngongo wetewete mōmuka whatu. Nā tōna kaha me tōna pakari ka taea te tautoko me te tiaki i ngā muka whatu, ka ārai i ngā kino i puta mai i ngā āhuatanga ā-tinana pēnei i te piko me te totoro. Hei tāpiri, he tino pai te ātete wera me te mahi ārai-pakeke o te rauemi PBT, e āwhina ana ki te whakarei ake i te pumau me te pono o ngā taura whatu i te wā roa e whakamahia ana. Ko tētahi o ngā rauemi PBT matua e whakamahia ana i roto i ngā taura whatu i ēnei rā.
He maha hoki ngā wā ka whakamahia te PBT hei uhi o waho o ngā taura whatu. Ehara i te mea me whai kaha miihini te uhi kia taea ai te aro atu ki ngā huringa o te taiao o waho, engari me whai ātete pai ki te kakahu, ki te waikura matū me te ātete ki te koroheketanga UV kia roa ai te ora o te taura whatu i te wā e whakatakotoria ana ki waho, i roto i ngā taiao haukū, i roto rānei i te moana. He nui ngā whakaritenga mō te mahi tukatuka me te urutau taiao o te PBT ki te uhi taura whatu, ā, he pai te hototahi o te kapia PBT ki te tono.
I roto i ngā pūnaha hononga taura whatu, ka taea hoki te whakamahi i te PBT hei hanga i ngā wāhanga matua pēnei i ngā pouaka hononga. Me tutuki i ēnei wāhanga ngā whakaritenga tino pakari mō te hiri, te ārai wai me te ātete ki te huarere. He kōwhiringa tino pai te rauemi PBT, me ōna āhuatanga ā-tinana tino pai me te pumau hanganga, ā, he tūranga tautoko hanganga nui tana e whai wāhi ana ki te pūnaha rauemi mata taura whatu.
4. Ngā Whakatūpato Tukatuka
I mua i te tukatuka i te werohanga whakarewa, me whakamaroke te PBT i te 110℃ ki te 120℃ mō te 3 hāora pea hei tango i te makuku e mimiti ana, hei karo hoki i te hanganga o ngā mirumiru, i te pakarukaru rānei i te wā e tukatukahia ana. Me whakahaere te pāmahana whakarewa i waenga i te 250℃ me te 270℃, ā, me pupuri tonu te pāmahana pokepoke i te 50℃ ki te 75℃. Nā te mea ko te pāmahana whakawhiti karāhe o te PBT he 22℃ anake, ā, he tere te tere whakamātao tioata, he poto noa te wā whakamatao. I te wā e werohanga whakarewa ana, me ārai i te iti rawa o te pāmahana o te pūwero, ka ārai pea i te awa rere. Mena ka neke ake te pāmahana o te oko i te 275℃, ka roa rawa rānei te noho o te rauemi rewa, ka pakarukaru pea te wai wera me te pakarukaru.
E taunakihia ana kia whakamahia he kuaha nui ake mō te werohanga. Kaua e whakamahia te pūnaha wera. Me mau tonu te pānga pai o te pokepokea ai. Kāore e tūtohutia kia whakamahia anō ngā rauemi PBT sprue kei roto ngā ārai mura, ngā whakakaha muka karāhe rānei, kia kore ai e heke te mahi. Ina whakawetohia te mīhini, me horoi te oko i te wā tika ki te rauemi PE, PP rānei kia kore ai e waro ngā rauemi toenga. He mea nui ēnei tawhā tukatuka mō ngā kaihanga rauemi mata taura whatu i roto i te hanga rauemi taura nui.
5. Ngā Painga o te Taupānga
Nā te whakamahinga o te PBT i roto i ngā taura whatu kua tino whakapai ake i te mahi whānui o ngā taura whatu. Nā tōna kaha me tōna pakari teitei ka whakarei ake i te ātete pānga me te ātete ngenge o te taura whatu, ā, ka roa ake tōna ora mahi. I taua wā, nā te pai o te tukatuka o ngā rauemi PBT kua whakarei ake i te pai o te whakaputa me te whakaiti i ngā utu hanga. Nā te pai o te ātete ki te koroheketanga me te waikura matū o te taura whatu ka taea te pupuri i te mahi pumau mō te wā roa i roto i ngā taiao uaua, ka tino whakarei ake i te pono me te huringa tiaki o te hua.
Hei wāhanga matua o ngā rauemi mata o ngā taura whatu, he mahi nui tā te kapia PBT i roto i ngā hononga hanganga maha, ā, ko tētahi o ngā kirihou hangarau kirihou wera e tino arohia ana e ngā kaihanga taura whatu i te wā e whiriwhiri ana i ngā rauemi taura.
6. Ngā Whakatau me ngā Tūmanako
Kua noho te PBT hei rauemi tino nui i roto i te ao hanga taura whatu nā tōna mahi tino pai i roto i ngā āhuatanga miihini, te pumau wera, te ātete ki te waikura me te ngāwari ki te tukatuka. I te heke mai, i te mea kei te whakapai tonu te umanga whakawhitiwhiti kōrero whatu, ka nui ake ngā whakaritenga mō te mahi rauemi. Me whakatairanga tonu te umanga PBT i te auahatanga hangarau me te whanaketanga tiaki taiao matomato, me te whakarei ake i tana mahi whānui me te pai o te whakaputa. I te whakatutuki i ngā whakaritenga mahi, mā te whakaiti i te whakapaunga pūngao me ngā utu rauemi ka āwhina i te PBT ki te whai wāhi nui ake i roto i ngā taura whatu me te whānuitanga o ngā mara tono.
Wā tuku: Pipiri-30-2025