Kua puta ake ngā Hydrofluoroolefins (HFO) hei wāhanga matua i roto i te hanga pahuka polyurethane ārai, nā te iti o te kaha whakamahana ā-ao (GWP) ki te whakataurite ki ngā mea pupuhi tuku iho pēnei i ngā hydrofluorocarbons (HFC) me ngā hydrochlorofluorocarbons (HCFC). I roto i ēnei pūnaha, he mea nui te pumau me te mahi a ngā whakakorikori polyurethane hei whakatutuki i ngā āhuatanga pahuka e hiahiatia ana. I roto i ngā whakakorikori e whakamahia ana i roto i ngā pūnaha HFO, ko te DMDEE (Dimethylethanolamine) te mea e tu ke ana nā tōna hototahi me tōna pumau.
Te Whakapūmau i ngā Pūnaha HFO
Kei te piki haere te rongonui o ngā HFO i roto i te umanga nā ō rātou painga taiao me te whai huatanga o te whakamahana pahuka. Heoi, he wero motuhake te whakaurunga o ngā HFO ki roto i ngā pūnaha polyurethane, inā koa mō te pumau o ngā whakakorikori. Ka taea e ngā whakakorikori amine tuku iho te whakaatu i te iti o te pumau i roto i ngā pūnaha e hangai ana ki te HFO, ka arahi ki ngā rerekētanga o te kounga me te mahi pahuka. Koinei te wāhiDMDEEhe mahi nui tāna.
E mōhiotia ana te DMDEE mō tōna ngoikore o te mahi amine, ā, e tino pumau ai ina whakamahia i roto i ngā pūnaha polyurethane HFO. He mea nui tēnei pumau hei whakarite i te hanga pahuka ōrite, nā te mea ka ārai i ngā tauhohenga wawe ka pā kino ki te hanganga o te pahuka me ōna āhuatanga ārai. Mā te hototahitanga o te DMDEE me ngā HFO ka noho tonu tōna kaha puta noa i te tukanga pahuka, ka whai wāhi ki te hanganga pūtau ōrite me te mahi ārai pai rawa atu.
Te Whakamahinga Whānui i roto i te HFO-StabilizedKaiwhakaohoNgā otinga
Nā te pumau o te DMDEE ki ngā HFO kua whānuitia te whakamahinga i roto i te nuinga o ngā otinga whakakorikori HFO. He tino whai hua ki te pupuri i te taurite i waenga i ngā tauhohenga pupuhi me te whakamaroke, he mea nui tēnei mō te whakatutuki i te pahuka kounga teitei me ngā āhuatanga whakamahana wera pai rawa atu. Ko te ngoikore o te mahi amine o te DMDEE ehara i te mea ka whakarei ake i tōna pumau engari ka whai wāhi hoki ki te whakatikatika i te kōtaha tauhohenga o te pahuka, kia pai ai te tukanga pahuka me te whakahaere.
Ngā Ākena Pupuhi i roto i te Hanga Pahuka Polyurethane
Haunga ngā HFO, he maha atu anō ngā mea pupuhi e whakamahia ana i roto i te hanga pahuka polyurethane, tae atu ki ngā HFC, ngā HCFC, ngā formate, ngā ketone (pērā i te acetone), me ngā warowaihā. He āhuatanga motuhake tō ia o ēnei mea ka taea te awe i te whiriwhiri i ngā whakakorikori. Heoi, i roto i ngā pūnaha e hangai ana ki te HFO, kua tata kore e taea te whakamahi i te DMDEE nā tōna pumau me te mahi kāore e taea te whakataurite.
Hei whakamutunga, he mea nui te mahi a te whakakorikori DMDEE ki te whakau i ngā pūnaha polyurethane HFO, kia mau tonu ai te kounga o te pahuka me te whakapai ake i te mahi whakamahana. Nā te hototahi ki ngā HFO, he mea nui tēnei i roto i ngā otinga whakamahana hou, e pai ana ki te taiao.
Wā tuku: 26 o Ākuhata-2024