He hanganga matua ngā ngongo muka whatu hei tiaki i ngā muka mai i te ahotea o waho, hei whakarite hoki i te pumau o te mahi tuku. Ko te whiriwhiri rauemi te mea e whakatau tika ana i te pono o te miihini me te roa o te mahi a ngā taura whatu.
He aha i pai ake ai te PBT
Te Polybutylene terephthalate (PBT)he 2–3 GPa te modulus elastic noa iho, he teitei ake i tērā o PA12 (polyamide 12), arā, tata ki te 1.2–1.8 GPa. Ko te tikanga he iti ake te whakarerekētanga i raro i te kawenga kotahi, ā, he pai ake te ātete ki te pēhanga taha.
Ko tōna tauwehenga whānuitanga wera rārangi tata ki te (6–10) × 10⁻⁵ /°C, e whakarato ana i te pumau āhuahanga tino pai, e āwhina ana ki te whakahaere i te roa rawa o te muka me te whakaiti i ngā mōrearea piko moroiti i raro i ngā rerekētanga pāmahana.
Hei tāpiritanga, nā te iti o te mimiti makuku, te ātete matū pai, me te utu taurite, ko te PBT tētahi o ngā rauemi matua mō ngā tono ngongo korekore.
Me mōhio ko te PBT he pūhui haurua-kiriata, ā, ko tōna kiriata e whakawhirinaki ana ki ngā āhuatanga tukatuka whakaputa. He mea nui te whakahaere tika o te tukanga kia tutuki ai te mahi pumau.
Ngā Tawhā Mana Matua e Toru
Ko te pumau o te mahi a ngā ngongo wetewete e whakawhirinaki ana ki te whakahaere pakari i ngā tawhā matua e toru, e pā tika ana ia tawhā ki te mahi a te taura mō te wā roa:
Taupū Rere Rewa (MFI):
E whakaata ana i te rere o te wai whakapūtanga. Mō te PBT o te ngongo wetewete, ka whakahaeretia i te 7.0–15.0 karamu/10 meneti. Me hono pai ki ngā taputapu tukatuka; ki te kore, ka pāngia pea te kounga o te hanganga ngongo.
Te whakahekenga:
Ka pā te whanonga whakaheke wera ki te tohatoha roa rawa o te muka i roto i te ngongo, ka pā tēnei ki te ngaronga o te piko moroiti me te mahi pāmahana iti. He mea nui tēnei mō te tuku whatu pumau.
Ātete ki te koroheketanga o te wai wera:
Tērā pea ka pāngia ngā here ester i roto i ngā mekameka ngota PBT e te waikura i raro i te pāmahana teitei me te haumākū teitei, ka heke ai te mahi. Ko te tere o te koroheketanga mā te whakamahi i ngā whakamātautau oko pēhanga, e aromatawai ana i te matotoru ā-roto me te pupuri i ngā āhuatanga miihini, e whakamahia whānuitia ana hei aromatawai i te pono mō te wā roa. Koinei hoki tētahi o ngā take e whakamahia whānuitia ai te PBT i roto i ngā taura whatu i raro whenua me ngā taura taiao uaua.
Ngā Rauemi Rerekē me ngā Whakarerekētanga mō ngā Whakamahinga Motuhake
Kāore e pai ana ngā tono katoa mō te PBT parakore. I runga anō i ngā whakaritenga taiao, ka whakamahia ngā rauemi rerekē me ngā hangarau whakarerekētanga hei tāpiri:
PP (Poroporopīrene):
He pai ake te ātete o te PP ki te waikura, ā, he pai hoki te ngāwari. Heoi, nā te iti o te kaha o te waikura, ko te hototahitanga ki ngā matū whakakī e whakawhirinaki ana ki ngā pūnaha whakatakotoranga motuhake, ā, me arotake marie.
PA12 (Polyamide 12):
I whakamahia te PA12 i roto i ngā hoahoa ngongo wetewete o mua, engari nā te iti o te modulus me te utu nui, kua whakakapia te nuinga ki ngā tono matua. Inaianei kei te whakamahia whānuitia i roto i ngā tono motuhake e hiahia ana ki te ngāwari teitei.
Ngā Huarahi Whakarerekētanga:
Ko te whakapainga tino kitea i roto i te mahi ārai-piko i ahu mai i te whakaranu i te PBT me te TPEE (Thermoplastic Polyester Elastomer). Ka whakapai ake te hanganga wāhanga-mārō/wāhanga-ngohengohe i te ātete piko auau, ka tutuki ai ngā whakaritenga mō te hononga taura me te ara hurihuri hihiri.
Hei tāpiritanga, kei te tūhuratia hoki ngā pūnaha whakaranu PET/PBT hei whakataurite i te mahi me te utu.
Ngā Whakaritenga Matua mō te Mahi o ngā Matū Whakakī (Te Tiēre Taura)
Ko te matū whakakī i roto i te ngongo he mea tiaki nui mō ngā muka whatu, ā, ko tōna mahi ka arotakehia e ēnei e whai ake nei:
Te Tixotropy:
He rite tōna āhua ki te wai mātotoru iti i raro i te ahotea kutikuti kia māmā ai te whakakī, kātahi ka hoki wawe ki te āhua tio ina tūpato, hei whakarato i te whakamarie mō te wā roa me te tiaki ā-ringa mō ngā muka.
Te Whanaketanga o te Hauwai (Taumata Whakaputa Hauwai):
Ka nui ake te ngaronga o te tukunga hiko i te urunga o te hauwai ki roto i ngā muka whatu. Nō reira, me iti rawa te whakaputanga hauwai o ngā matū whakakī. Tērā pea kei roto i ngā hua papai ngā kaihoroi hauwai hei whakaiti i te mōrearea.
Te Ma me te Hototahi:
Me ōrite te matū, me karekau he poke, he mirumiru hau rānei, ā, me hototahi ki ngā paninga muka me ngā rauemi ngongo kia kore ai e pirau, e pāngia rānei e te taunekeneke.
Mai i te whakahaere whakatioata o te PBT, ki te arotau i ngā hangarau whakarerekētanga, ā, i te mutunga ki te whakakī i te mahi pūhui, me tino whakahaere ia taahiraa kia pai ai te pumau o te tuku whatu mō te wā roa, kia pai ai hoki te turanga mō ngā whatunga whakawhitiwhiti kōrero.
Wā tuku: Mei-28-2026