Ko te Toluene diisocyanate (TDI, CAS 26471-62-5), he matū waro nui e whakamahia whānuitia ana i roto i te mekameka uara polyurethane o te ao, kei te tautoko tonu i te tipu o ngā rāngai hangahanga, hangahanga, motuka, tāonga whare me ngā rāngai ahumahi. Nā ngā kaupapa here waro-iti, te whakapai ake hangarau me te hiahia o te mākete mutunga e whanake haere ana, kei te tomo te rāngai TDI ki tētahi wāhanga hou o te whanaketanga matomato, whai hua nui me te uara nui.
Hei matū diisocyanate tino tauhohe, ka hangaia te TDI hei ranunga o ngā isomers 2,4- me 2,6-. Ka tere te whakakotahi me ngā polyol hei hanga rauemi polyurethane e whakaatu ana i te ngāwari, te ātete ki te kakahu, te pumau o te rangi me te mahi whakamarumaru. Nā ēnei āhuatanga kua whakatū te TDI hei rauemi mata e kore e taea te whakakapi puta noa i ngā tono ahumahi maha.
Neke atu i te 70 ōrau o te whakamahinga TDI o te ao ka whakamahia ki te pahuka polyurethane ngāwari, e mahi ana hei urunga matua mō ngā moenga, ngā sofa, ngā nohoanga motuka me te whakamarumaru oro. Ko ētahi atu whakamahinga nui ko ngā paninga mahi-teitei, ngā hiri hoahoa, ngā piripiri ahumahi, ngā elastomers polyurethane, te hiako hangai me ngā kiriuhi ārai wai. Kei te mau tonu te tono i waenga i te noho tāone, te whakapai ake i ngā whare noho me ngā ia o te whakamama i ngā motuka.
Hei whakautu i ngā ture taiao me te haumaru pakari ake, kua tere ake te whakamahi a te umanga i ngā pūnaha whakaputa ma, atamai ake hoki. Nā te hangarau phosgenation tonu matatau, te whakaora wera para me ngā hangarau whakahaere tukunga porowhita kati kua tino whakaiti i te whakamahinga pūngao me ngā tukunga parahanga mō ia waeine putanga. Kua nui te ahunga whakamua o te rangahau ki ngā huarahi kore-phosgene me te TDI e ahu mai ana i te koiora taurite-papatipu, e whakaiti ana i ngā tapuwae waro me te tautoko i ngā whāinga ōhanga porowhita.
Kua piki ake te taurite o ngā whanaketanga o te tuku me te tono o te ao i ngā tau tata nei. Nā te arotau i te kaha me te whakaputanga whakauru kua pai ake te pumau o te mahi me te whakataetae utu. Nā te pikinga o ngā rahinga kaweake kua whānui ake te urunga ki te mākete o te ao, ā, kua rerekē te tono ki ngā paninga mahi-teitei, ngā hiato motuka, ngā wāhanga pūngao hou me ngā polymer kounga-hauora.
I te mea he matū morearea kei raro i ngā ture tino pakari o te ao mō te kawe me te whakahaere, ka mau tonu te umanga TDI i te whakahaere haumaru pakari puta noa i te whakaputanga, te rokiroki, te whakahaere me te tono. Kua whakatinanahia whānuitia ngā tikanga whakahaere paerewa, ngā whakaritenga taputapu tiaki whaiaro me ngā kawa urupare ohorere hei whakarite i te hauora mahi me te haumaru taiao.
I te tirohanga whakamua, ka noho tonu a TDI hei mea nui mō te umanga polyurethane o te ao. Mā te auahatanga tonu i roto i te whakaputa matomato, te whakamahine parakore teitei me ngā rauemi koiora ka whakarei ake i tōna pūmanawa tono. Mā te tautoko a te tono pakari o te mākete mutunga me ngā kaupapa here whanaketanga pumau, kua rite a TDI ki te tuku uara mō te wā roa me te whakatairanga i te whakawhiti waro-iti o ngā rāngai matū me ngā rāngai hanga matatau.
Wā tuku: 13 Paenga-whāwhā 2026
