Te Hydroxypropyl methylcellulose (HPMC) He rauemi pūmua wairewa-wai tēnei e whakamahia whānuitia ana i roto i te rongoā, te kai, te hanga me ētahi atu mara. He pai te pumau o te pāmahana, engari ka pirau tonu i raro i te pāmahana tiketike. Ko te pāmahana pirau o te HPMC ka pāngia nuitia e tōna hanganga ngota, ngā āhuatanga taiao (pēnei i te haumākū, te uara pH) me te wā whakamahana.
Te pāmahana pirau o te HPMC
Ko te pirau wera o te HPMC ka tīmata te puta i runga ake i te 200℃, ā, ka puta te pirau mārama i waenga i te 250℃-300℃. Ina koa:
I raro i te 100℃Ko te HPMC e whakaatu ana i te mimiti wai me ngā panonitanga o ngā āhuatanga ā-tinana, ā, kāore he pirau e puta.
100℃-200℃Tērā pea ka puta he waikura wāhanga i te HPMC nā te pikinga o te pāmahana ā-rohe, engari he pumau katoa.
200℃-250℃Ka āta whakaatu te HPMC i te hekenga wera, e kitea nuitia ana ko te whati hanganga me te tukunga o ngā matūriki ngota iti.
250℃-300℃Ka mārama te pirau o te HPMC, ka pōuri haere te tae, ka tukuna ngā ngota iti pēnei i te wai, te methanol, te waikawa acetic, ā, ka puta te whakapūngao waro.
Neke atu i te 300℃Ka tere te pirau o te HPMC, ka whakapūkara hoki, ā, ka toe tonu ētahi matū kore-waro ki te mutunga.
Ngā āhuatanga e pā ana ki te pirau o te HPMC
Taumaha ngota me te taumata o te whakakapinga
Ina nui te taumaha ngota ngota o te HPMC, he teitei te ātete ki te wera.
Ka pā te kaha o te whakakapinga o ngā rōpū methoxy me te hydroxypropoxy ki tōna pumau wera. Ko te HPMC me te kaha o te whakakapinga ka ngawari ake te pirau i ngā pāmahana teitei.
Ngā āhuatanga taiao
Haumākū: He kaha te waiora o te HPMC, ā, ka tere ake te pirau o te HPMC i ngā pāmahana tiketike.
Uara pH: He ngāwari ake te HPMC ki te waikura me te pirau i raro i ngā āhuatanga waikawa kaha, kawakore rānei.
Te wā whakamahana
Te whakamahana ki te 250℃mō te wā poto, tērā pea kāore e tino pirau, engari mā te pupuri tonu i te pāmahana teitei mō te wā roa ka tere ake te tukanga pirau.
Ngā hua pirau o te HPMC
Ko te nuinga o te HPMC i ahu mai i te cellulose, ā, he rite tonu ōna hua pirau ki te cellulose. I te wā e whakamahanahia ana, ka tukuna pea ēnei mea e whai ake nei:
Te kohu wai (mai i ngā rōpū hydroxyl)
Mētanora, ētanora (mai i ngā rōpū metoki me te haikoporoki)
Waikawa acetic (mai i ngā hua pirau)
Ngā waikura waro (CO, CO₂, i puta mai i te tahunga o ngā mea rauropi)
He iti noa te toenga o te kōka
Te ātete wera o te HPMC
Ahakoa ka heke haere te HPMC i runga ake i te 200℃, kāore i te nuinga o te wā e pāngia ana e ngā pāmahana teitei i roto i ngā whakamahinga tūturu. Hei tauira:
Ahumahi rongoā: Ko te HPMC te nuinga e whakamahia ana mō te paninga papa me ngā kaihoko tuku-roa, e whakahaerehia ana i te 60℃-80℃, he iti rawa atu i tōna pāmahana pirau.
Ahumahi kai: Ka taea te whakamahi i te HPMC hei whakamātotoru, hei emulsifier rānei, ā, ko te pāmahana whakamahinga tikanga kāore e neke ake i te 100℃.
Ahumahi hanga: Ka whakamahia te HPMC hei whakamātotoru sima me te moata, ā, ko te pāmahana hanga kāore e neke ake i te 80℃, ā, e kore e puta he whakararuraru.
HPMC ka tīmata te memeha i te pāmahana i runga ake i te 200℃, ka tino pirau i waenga i te 250℃-300℃, ā, ka tere te whakapūkara i te waro i runga ake i te 300℃I roto i ngā mahi whaihua, me karo te noho roa ki te pāmahana teitei hei pupuri i tōna mahi pumau.
Wā tuku: Paenga-whāwhā-03-2025