Te tauhohenga matū taketake i te wā o te whakarārangi kore-whakarewa

I te haere tonu o te hangarau, e manakohia ana te nuinga o ngā kaihanga mōkihi ngāwari ki te whakakī kore-whakarewa.

He tere ake, he māmā ake, he pai ake te taiao, he iti ake te utu, koinei ngā painga o te whakakanapa kore-whakarewa.

He mea tino nui kia mōhio tātou ki te tauhohenga matū taketake i te wā o te whakarārangi kore-whakarewa kia pai ake ai te whakaputa papatipu.

Ngā wāhanga e ruaPiripiri kore-whakarewai hangaia mā te polyurethane (PU), i honoa te PU mā te isocyanate(-NCO) e kiia nei ko te wāhanga A, me te polyol(-OH) e kiia nei ko te wāhanga B. Tirohia ngā taipitopito o te tauhohenga i raro nei;

Ko te tauhohenga matua kei waenganui i a A me B, ka tauhohe te matū o te -NCO ki te -OH, i te wā kotahi, nā te mea kei te wai anō te rōpū mahi -OH, ka tauhohe te matū o te wai me te wāhanga A ka tukuna te CO₂,Te hauhā waro. Me te polyurea.

Te Tumu Whakahaere₂ Tērā pea ka puta te raruraru mirumiru, ā, ka puta te hiri ārai-wera nā te polyurea. Haunga, ki te nui rawa te haumākū, ka nui rawa te wāhanga A e pau i te wai. Ko te mutunga, kāore e taea e te piripiri te whakamaroke 100%, ā, ka heke te kaha o te piri.

Hei whakarāpopototanga, ka tūtohu mātou;

Me penapena te piripiri ki te wāhi hauhautanga, maroke, kia matara atu i te makuku.

Me pupuri te haumākū o te awheawhe i waenga i te 30% ki te 70%, ā, me whakamahi hoki i te hauhautanga hei whakahaere i te haumākū.

Kei runga ake nei ngā tauhohenga matū taketake i waenga i ngā piripiri wāhanga e rua, engari he rerekē rawa te piripiri wāhanga-kotahi, ka whakaurua e mātou te tauhohenga matū wāhanga-kotahi ā muri ake nei.