Ngā Āhuatanga Hangarau o te Rehu Papa Polyurethane Paku Pakari
Ko te rauemi whakamahana polyurethane pahuka pakari (PU) he pūhui he wae hanganga auau o te wāhanga carbamate, i hangaia mā te tauhohenga o te isocyanate me te polyol. Nā tōna whakamarumaru wera pai me te mahi ātete wai, he whānuitia ngā whakamahinga mō te whakamarumaru pakitara me te tuanui o waho, tae atu ki te rokiroki makariri, ngā whare rokiroki witi, ngā rūma pūranga, ngā paipa, ngā tatau, ngā matapihi me ētahi atu wāhi whakamarumaru wera motuhake.
I tēnei wā, haunga te whakamahi hei whakamahana tuanui me te ārai wai, he maha atu anō hoki ngā mahi a te rongoā, pērā i te whakamahi i ngā whare rokiroki matao me ngā whakaurunga matū nunui ki waenga.
Hangarau matua mō te hanganga rehu polyurethane pahuka mārō
Ko te matatau ki te hangarau rehu polyurethane pahuka pakari he wero nā te mea ka puta pea ngā raruraru pēnei i ngā kōhao pahuka kāore i te ōrite. He mea nui kia whakapakarihia te whakangungu o ngā kaimahi hanga kia taea ai e rātou te whakahaere pai i ngā tikanga rehu me te whakatau takitahi i ngā raruraru hangarau e pā ana ki te wā hanga. Ko ngā wero hangarau matua i roto i te rehu hanga e aro nui ana ki ngā āhuatanga e whai ake nei:
Te whakahaere i te wā mā me te pānga atomization.
Ko te hanganga o te pahuka polyurethane e rua ngā wāhanga: te pahuka me te whakamaroke.
Mai i te wāhanga whakaranu tae noa ki te mutunga o te whānui haere o te pahuka - e mōhiotia ana tēnei tukanga ko te pahuka. I tēnei wāhanga, me whai whakaaro ki te ōritetanga o te tohatoha o te pūwero mirumiru ina tukuna he nui o te ester wera tauhohe ki roto i te pūnaha i te wā e rehu ana. Ko te ōritetanga o te mirumiru e whakawhirinaki ana ki ngā āhuatanga pēnei i:
1. Te rerekētanga o te ōwehenga rauemi
He rerekētanga nui te mātotoru i waenga i ngā mirumiru i hangaia e te mīhini me ngā mea i hangaia e te ringa. Ko te tikanga, ko te ōwehenga rauemi kua whakaritea e te mīhini he 1:1; heoi, nā te rerekētanga o ngā taumata matotoru i waenga i ngā rauemi mā o ngā kaihanga rerekē - kāore pea ngā ōwehenga rauemi tuturu e ōrite ki ēnei ōwehenga kua whakaritea, ā, ka rerekē te mātotoru o te pahuka i runga i te nui rawa o te whakamahinga o ngā rauemi mā, pango rānei.
2. Te pāmahana ā-taiao
He tino pāngia ngā pahuka polyurethane e ngā piki me ngā heke o te pāmahana; ko te tukanga whakaputa pahuka e whakawhirinaki ana ki te waatea o te wera e puta mai ana i ngā tauhohenga matū i roto i te pūnaha me ngā whakaritenga taiao.
Ina nui te pāmahana o te taiao hei whakarato i te wera o te taiao - ka whakateretere i te tere o te tauhohenga, ka hua ake he pahuka kua whānui katoa me te kiato ōrite mai i te mata ki te matua.
I te taha rerekē, i ngā pāmahana iti iho (hei tauira, i raro i te 18°C), ka memeha haere ētahi o te wera tauhohenga ki ngā taiao, ka roa ake te wā whakamaroke me te piki haere o ngā tere whakahekenga pokepokea ai, ā, ka piki ake ngā utu whakaputa.
3. Hau
I te wā e rehu ana, ko te mea pai kia noho te tere o te hau i raro iho i te 5m/s; ki te nui ake i tēnei paepae ka pupuhi te wera e puta mai ana i te tauhohenga, ka pā mai te huka tere, ā, ka pakarukaru hoki ngā mata o te hua.
4. Te pāmahana me te haumākū o te turanga
He nui te pānga o ngā pāmahana o te pakitara turanga ki te whaihua o te pahuka o te polyurethane i te wā e whakamahia ana, inā koa he iti te pāmahana o te taiao me te pakitara turanga – ka tere te mimiti i muri i te paninga tuatahi ka whakaiti i te hua katoa o te rauemi.
Nō reira, he mea nui te whakaiti i ngā wā okiokinga o te poutumarotanga i te wā o ngā mahi hanga me ngā whakaritenga rautaki hei whakarite i te tere whakawhanui pai rawa atu o te pahuka polyurethane.
Ko te pahuka polyurethane pakari he hua pūmua i hangaia mā ngā tauhohenga i waenga i ngā wāhanga e rua – te isocyanate me te polyether kua whakakotahitia.
Ka tere te tauhohe o ngā wāhanga isocyanate ki te wai e whakaputa ana i ngā hononga urea; mā te pikinga ake o te nui o ngā hononga urea ka pakarukaru ngā pahuka, ka whakaitihia te piri i waenga i a rātou me ngā papa, ā, me horoi, maroke hoki ngā mata o te papa, kia kore ai he waikura/puehu/makuku/parahanga, inā koa te karo i ngā rā ua e hiahiatia ana te tango i te tomairangi/hukapapa, ā, muri iho ka whakamaroke i mua i te haere tonu.
Te wā tuku: Hurae-16-2024