Ko te Polyurethane (PU) tētahi o ngā pūhui hangarau tino maha ngā whakamahinga i roto i te umanga matū hou. He whānuitia te whakamahinga i roto i te pahuka ngāwari, te pahuka pakari, ngā paninga, ngā piripiri, ngā elastomers, me ngā rauemi whakamahana. Ko tōna painga ahurei kei roto i tōnangāwari o te hanganga, e āhei ai ngā kaihanga ki te whakarite i te mahi mā te whakarerekē i ngā rauemi mata me te hanganga ngota.

He mea nui te mārama ki te hanganga polyurethane hei whakapai ake i te kounga o te hua, hei whakapai ake i te whai huatanga o te tukatuka, me te whakatutuki i ngā whakaritenga tono motuhake.

1. Ngā Rauemi Matua o te Hanganga Polyurethane

E whā ngā wāhanga matua o te pūnaha polyurethane: ngā polyol, ngā isocyanate, ngā catalysts, me ngā tāpiringa. He mahi nui tā ia wāhanga ki te whakatau i te mahi whakamutunga o te rauemi.

1.1 Ngā Polyol – Te Wāhanga Ngāwari

Ko ngā polyol te wāhanga ngohengohe o te polyurethane, ā, he pānga tika tō rātou ki te ngāwari, te ngāwari, me te mahi pāmahana iti.

Ko ngā momo noa ko ngā polyol polyester me ngā polyol polyether. I roto i ngā tono matatau,ngā polyol motuhakee whakamahia ana hei whakapai ake i te ātete ki te mura, te pumau o te waikura, me te kaha ā-ringa.

1.2 Ngā Isocyanate – Te Wāhanga Mārō

Ka whakaratohia e ngā isocyanates te kaha hanganga, ā, ka tautuhia hoki te pakeke, te ātete ki te wera, me te roa.

• Pūnaha MDI: e whakamahia whānuitia ana i roto i ngā elastomers, ngā pahuka pakari, me ngā piripiri
• Pūnaha TDI: e whakamahia whānuitia ana mō te hanga pahuka ngāwari
• Ngā pūnaha e hangai ana ki te HDI: e whakamahia ana i roto i ngā paninga mahi-teitei me te ātete pai ki te huarere

Ko te taurite i waenga i ngā wāhanga ngohengohe me ngā wāhanga mārō e whakatau ana mēnā he pahuka ngohengohe, he kirihou mārō rānei te hua whakamutunga.

1.3 Ngā Whakakōkī – Te Whakahaere i te Taurite Tauhohenga

He mea nui ngā matū whakakorikori mō te whakahaere i te tere o te tauhohenga o te polyurethane, te hanganga o te pahuka, me te whanonga whakamaroke. Ka whakahaere rātou i te taurite i waenga i ngā tauhohenga whakapūkara me te pahuka.

He whānuitanga katoa o ngā whakakōkī mahi-teitei e tukuna ana e MOFAN:

Mā te whiriwhiri tika i ngā whakakōkī ka nui ake te kounga o te pahuka, te pumau o te tukatuka, me te whai huatanga o te whakaputa.

1.4 Ngā Tāpiri me ngā Rauemi Whai Hua

Ka whakamahia ngā tāpiringa hei whakarei ake i te mahi me te whakatutuki i ngā whakaritenga tono motuhake, tae atu ki:

• Ngā ārai mura
• Ngā kai pupuhi
• Ngā Kaiwhakaū
• Ngā whakarerekētanga mahi

Mā ēnei tāpiringa ka āwhina i te polyurethane ki te whakatutuki i ngā whakaritenga o ēnei rā pēnei i te haumaru ahi, te whai huatanga o te pūngao, me te tutuki i ngā whakaritenga taiao.

2. Hoahoa Ngota: Te Whakataurite i ngā Wāhanga Ngāwari me ngā Wāhanga Mārō

Ko te mea nui ki te mahi a te polyurethane kei roto i te taurite i waenganui ingā wāhanga ngohengohe (polyols)mengā wāhanga mārō (ngā isocyanate + ngā whakaroa mekameka).

• He nui ake te ihirangi wāhanga ngohengohe → he rauemi ngohengohe ake, he ngāwari ake
• He nui ake te ihirangi wāhanga mārō → he rauemi kaha ake, he rauemi pakari ake

Mā tēnei whakahāngai ngota ngota ka taea te hanga i te polyurethane mō ngā momo mahi maha, mai i ngā pahuka urunga ngohengohe ki ngā panera whakamahana pakari.

3. Hoahoa Hanganga e Hangai ana ki te Taupānga

He rerekē ngā rautaki whakatakotoranga e hiahiatia ana mō ngā tono rerekē:

• Pahuka NgāwariArotahi ki te whakamarie, te manawanui, me te whakangāwari
• Pahuka MārōArotahi ki te whakamarumaru me te kaha o te hanganga
• Ngā ElastomersArotahi ki te ātete ki te kakahu me te kaha ā-ringa
• Ngā paningaArotahi ki te ātete ki te huarere me te pakari o te mata
• Ngā piripiriArotahi ki te kaha o te piri me te pumau matū

Mā te whakarerekē i ngā ōwehenga rauemi mata me ngā pūnaha whakakorikori, ka taea e ngā kaihanga te whakahaere tika i ngā putanga mahi.

4. Ngā Tohu Mahi Matua

I te aromatawai i ngā rauemi polyurethane, he mea nui kia whakaarohia ētahi āhuatanga matua:

• Te mārō (Tahataha A/D)– e tohu ana i te ngawari, i te pakari rānei
• Te kaha o te kume– e ine ana i te pakari ā-mīhini
• Te roa i te wā whati– e whakaata ana i te ngāwari
• Ātete ki te pakū– e whakatau ana i te mahi mau
• Huinga kōpeketanga– aromatawai i te ngāwari mō te wā roa

Ka pāngia tika ēnei āhuatanga e te hoahoa whakatakotoranga me te kōwhiringa o ngā rauemi mata.

5. Ngā Auahatanga Ahumahi: Te anga atu ki te Polyurethane Tauwhiro

Kei te ahu whakamua te whanaketanga o te polyurethane hou ki:

• Ngā pūnaha polyurethane wai
• Ngā polyol e ahu mai ana i te koiora
• Ngā hanganga VOC iti
• Ngā aukati mura kore-halogen

Kei te noho ko te pumau me te tutuki i ngā ture hei kaiārahi matua mō te auahatanga rauemi, inā koa i roto i ngā ahumahi hanga, motuka, me te kaihoko.

Whakamutunga

Ko te whānuitanga o te polyurethane i ahu mai i tōna ngāwari hoahoa ngota. Mā te whiriwhiri tupato i ngā polyol, ngā isocyanate, ngā catalysts, me ngā tāpiringa, ka taea e ngā kaihanga te whakahaere tika i te mahi a ngā rauemi mō te whānuitanga o ngā tono.

Mā te mārama ki ngā mātāpono o te hanga e kore e whakapai ake i te kounga o te hua anake, engari ka āwhina anō hoki ki te whakapai ake i te whai huatanga o te whakaputa me te whakaiti i ngā mōrearea whakangao.

Mō ngā rauemi mata polyurethane mahi-teitei me te tautoko hanganga, ka whakaratohia e MOFAN he kohinga katoa o ngā whakakorikori, ngā polyol, ngā aukati mura, me ngā kai pupuhi hei tautoko i ngā tono ahumahi matatau.