1.Te Hydroxypropyl methylcellulose (HPMC)He mea nui te cellulose ether, e whakamahia whānuitia ana i roto i te hanga, i ngā rongoā, i te kai, i ngā mea whakapaipai me ētahi atu mara. He pai ngā āhuatanga whakamaroke, hanga kiriata, whakaemulsifying, whakatārewatanga me te pupuri wai o te HPMC, nō reira he mahi nui tāna i roto i te maha o ngā ahumahi. Ko te hanga o te HPMC e whakawhirinaki ana ki ngā tukanga whakarerekētanga matū. I ngā tau tata nei, me te whanaketanga o te hangarau koiora, kua tīmata hoki te aro ki ngā tikanga hanga e hangai ana ki te whakapūkara moroiti.
2. Te kaupapa whakaputa whakapūkara o te HPMC
Ko te tukanga whakaputa HPMC tuku iho e whakamahi ana i te cellulose tūturu hei rauemi mata, ā, ka whakaputaina mā roto i ngā tikanga matū pēnei i te alkaliization, te etherification me te refining. Heoi, he nui ngā whakarewa waro me ngā matū e whakamahia ana i roto i tēnei tukanga, ā, he nui te pānga ki te taiao. Nō reira, ko te whakamahinga o te fermentation microbial hei hanga i te cellulose me te etherify ake kua noho hei tikanga whakaputa e pai ake ana ki te taiao, e pumau ake ana hoki.
He kaupapa wera te hanga o te cellulose (BC) i ngā tau tata nei. Ka taea e ngā huakita tae atu ki te Komagataeibacter (pērā i te Komagataeibacter xylinus) me te Gluconacetobacter te hanga tika i te cellulose parakore mā te whakapūpū. Ka whakamahia e ēnei huakita te hukahuka, te glycerol, ētahi atu puna waro rānei hei papa, ka whakapūpū i raro i ngā āhuatanga e tika ana, ā, ka whakaputa i ngā muka nano cellulose. Ka taea te huri i te cellulose huakita ka puta hei HPMC i muri i te whakarerekētanga hydroxypropyl me te methylation.
3. Tukanga whakaputa
3.1 Te tukanga whakapūkara o te cellulose huakita
He mea nui te arotau i te tukanga whakapūkara hei whakapai ake i te hua me te kounga o te pūhui huakita. Ko ngā mahi matua koia ēnei:
Te tātari me te whakatipu momo: Kōwhiria ngā momo cellulose hua nui, pērā i te Komagataeibacter xylinus, hei whakawhanaunga me te arotau.
Waenga whakapūkara: Whakaratohia ngā pūtake waro (kurukō, sucrose, xylose), ngā pūtake hauota (tangohanga rewena, peptone), ngā tote kore-waro (phosphates, tote konupora, me ētahi atu) me ngā kaiwhakahaere (waikawa acetic, waikawa citric) hei whakatairanga i te tipu o te huakita me te hanga cellulose.
Te whakahaere i te āhua o te whakapūkara: tae atu ki te pāmahana (28-30℃), te pH (4.5-6.0), te taumata hāora rewa (te whakaoho, te ahurea pumau rānei), me ētahi atu.
Kohikohi me te purenga: Whai muri i te whakapūkara, ka kohia te cellulose huakita mā te tātari, te horoi, te whakamaroke me ētahi atu mahi, ā, ka tangohia ngā huakita toenga me ētahi atu poke.
3.2 Te whakarerekētanga o te methylation hydroxypropyl o te cellulose
Me whakarerekē matū te cellulose huakita i whiwhihia kia rite ki te HPMC. Ko ngā mahi matua koia ēnei:
Maimoatanga alkalinization: tōia ki roto i te nui e tika ana o te otinga NaOH hei whakawhānui i te mekameka cellulose me te whakapai ake i te mahi tauhohenga o te etherification muri.
Tauhohenga whakapūngao: i raro i ngā āhuatanga pāmahana me te whakapūngao motuhake, tāpirihia te propylene oxide (hydroxypropylation) me te methyl chloride (methylation) hei whakakapi i te rōpū cellulose hydroxyl hei hanga HPMC.
Te whakahāngai me te whakamahine: te whakahāngai ki te waikawa i muri i te tauhohenga hei tango i ngā matū kāore i tauhohe, ā, ka whiwhi i te hua whakamutunga mā te horoi, te tātari me te whakamaroke.
Te kuru me te whakarōpū: kuruhia te HPMC kia rite ki ngā whakaritenga, kātahi ka tātarihia, ka tākaihia kia rite ki ngā taumata matotoru rerekē.
4. Ngā hangarau matua me ngā rautaki arotau
Te whakapai ake i te momo: te whakapai ake i te hua me te kounga o te cellulose mā te hangarau ira o ngā momo moroiti.
Te arotau i te tukanga whakapūkara: te whakamahi i ngā pūmua koiora hei whakahaere hihiri hei whakapai ake i te whai huatanga o te whakaputa cellulose.
Te tukanga whakapūkara matomato: whakaitihia te whakamahinga o ngā whakarewa waro me te whakawhanake i ngā hangarau whakapūkara e pai ake ana ki te taiao, pērā i te whakarerekētanga whakakorikori whākōkī.
Te whakahaere kounga hua: mā te tātari i te tohu whakakapinga, te wairewatanga, te matotoru me ētahi atu tohu o te HPMC, kia tino tutuki ai ngā whakaritenga tono.
Ko te mea e hangai ana ki te whakapūkaraHPMCHe painga tō te tikanga whakaputa, arā, he mea whakahou, he mea pai mō te taiao, ā, he mea whai hua hoki, e hangai ana ki te ia o te matū matomato me te whanaketanga tauwhiro. I te whanaketanga o te hangarau koiora, e tūmanakohia ana ka whakakapia haeretia e tēnei hangarau ngā tikanga matū tuku iho, ā, ka whakatairangahia te whakamahinga whānui o te HPMC i roto i ngā mara o te hanga, te kai, te rongoā, me ētahi atu.
Wā tuku: 11 Paenga-whāwhā 2025