Ngā āhuatanga matū o te HPMC

Te Waikawa Waikawa Metilururo (HPMC)He etera cellulose kore-ionic tēnei, he hua kua whakarerekētia te matū i hangaia mā te tauhohenga o te cellulose tūturu me te propylene oxide me te methyl chloride i muri i te alkaliization. He pai te pumau ā-tinana me te matū o te HPMC, ā, he whānuitia te whakamahinga i roto i ngā rongoā, ngā rauemi hanga, te kai, ngā whakapaipai me ētahi atu mara. Ko ōna āhuatanga matū koia ēnei:

1. Ngā āhuatanga hanganga ngota

Ko te angaanga taketake o te HPMC i ahu mai i te cellulose tūturu, i hangaia e ngā waeine hukahuka e honoa ana e ngā hononga β-1,4-glycosidic hei hanga i tētahi mekameka macromolecular rārangi. Mā te whakaurunga o ngā rōpū hydroxypropyl me te methoxy ka whakakapia ngā rōpū hydroxyl (-OH) i runga i te mekameka ngota cellulose, ā, ka hoatu he āhuatanga ahurei ki a ia. He pānga nui tēnei taumata whakakapinga (arā, te taumata whakakapinga o ngā rōpū methoxy me te hydroxypropyl) ki te wairewa, ngā āhuatanga tiēre me te pumau o te HPMC.

2. Te wairewatanga

Ko te HPMC he pūhui wai-rewa kore-ionic noa iho, ka tere te pupuhi i roto i te wai matao, ka hanga he otinga colloidal mārama, mārama rānei. Heoi, i roto i te wai wera, kāore e ngāwari te rewa o te HPMC, ā, ka hanga he tiēre i ngā pāmahana teitei. Ko tēnei āhuatanga tiēre whakahurihuri wera tētahi o ngā āhuatanga ā-tinana me te matū nui o te HPMC. Haunga te wai, ka taea hoki te rewa te HPMC i roto i ētahi whakarewa waro polar, pērā i te whakarewa whakauru o te etanoru me te wai, te dimethylformamide, me ētahi atu.

3. Te pumau wera me te whakapūmautanga

He tino pai te pumau o te HPMC i te wera. I te pikinga o te pāmahana, ka pāngia ngā mekameka ngota HPMC i roto i te wairewa wai e te matewai hei hanga i tētahi hanganga whatunga toru-ahu, ā, ka puta he whakawhiti mai i te wairewa ki te tiēre. Ko te pāmahana tiēre e whakawhirinaki ana ki te ihirangi me te taumaha ngota o ngā whakakapinga. I te nuinga o te wā, he teitei ake te pāmahana tiēre o te HPMC he nui te ihirangi hydroxypropyl, ko te HPMC he nui te ihirangi methoxy he iti ake te pāmahana tiēre.

Ka taea te huri i te whakapūkara, ā, ka memeha anō te tīra ki te āhua wai i muri i te whakamatao. Nā tēnei āhuatanga motuhake o te tīra wera, ka whakamahia te HPMC hei rauemi tuku-roa i roto i te umanga rongoā, ā, ka whakamahia hoki i roto i te umanga rauemi hanga hei whakapai ake i te mahi hanga o te moata.

4. te pumau o te pH

Ka mau tonu te pumau o te HPMC i roto i te awhe pH o te 3~11. Mā tēnei awhe pumau pH whānui ka taea te whakamahi i roto i ngā momo taiao me te kore e pakaru, e maturuturu rānei. Ina iti iho te uara pH i te 3, neke atu rānei i te 11, ka pakaru, ka whakapūpū rānei te otinga nā te nui o ngā kukū o ngā katote hauwai, ngā katote hauwai rānei, ka heke te mahi.

5. Te Tauhohenga Matū

Nā te mea kei roto i te ngota HPMC ētahi rōpū hydroxyl kāore i whakakapia, kei te mau tonu tētahi mahi matū, ā, ka taea e ia te whai i ēnei tauhohenga:

Tauhohenga whakahāngai: I raro i ngā āhuatanga tika, ka taea e te HPMC te tauhohe ki ngā acyl chloride, ngā anhydride, me ētahi atu hei hanga i ngā esters;

Tauhohenga whakapūngao: Ka taea e ngā rōpū hydroxyl toenga te tauhohe tonu me ngā kaihoko whakapūngao (pērā i ngā epoxide) hei whakarerekē anō i te taumata o te whakakapinga me te mahi a te HPMC;

Tauhohenga waikura: I te aroaro o ngā waikura kaha (pērā i te pāhare pākawa waro, te konutai hauhāoraiti), ka whati pea te mekameka ngota o te HPMC, ka heke te matotoru;

Tauhohenga waikura: I raro i te mahi a ngā waikawa kaha, ngā turanga kaha rānei, ka waikura pea ngā mekameka taha hydroxypropyl me te methoxy, ka puta he huringa ki te hanganga ngota me te hekenga o te mahi.

I te nuinga o te wā, i raro i ngā āhuatanga tono noa, he pumau ngā āhuatanga matū o te HPMC.

6. Te pirau o te koiora

I ahu mai te HPMC i te cellulose tūturu, nō reira ka taea te wawahi hei huka ngota iti i roto i tētahi taiao koiora motuhake (pērā i raro i te mahi a ngā moroiti), ā, ka mutu ka pirau hei hauhā waro me te wai. Nā tēnei pirau pai ka tutuki i te HPMC ngā whakaritenga o ngā rauemi e pai ana ki te taiao.

7. Te hototahitanga ki ētahi atu matū

Hei pūmua kore-ionic, he pai te hototahitanga o te HPMC ki ngā momo tāpiringa ionic, kore-ionic rānei (pērā i ētahi atu pūmua, ngā matūkai, ngā mea whakamaroke, me ētahi atu). Ina koa i roto i te pūnaha whakatakotoranga, ka taea te mahi me ngā momo kai rongoā, ngā matūkai, ngā tae, me ētahi atu, me te kore e whakatōtō, e whakarōpū rānei.

Ka pāngia te pumau o te HPMC i roto i te taiao kukū nui o te irahiko, ā, ki te nui rawa te tote kore-waro, ka heke pea te matotoru o te otinga, ka puta rānei he putunga.

8. Te ātete ki te whākōkī

Ki te whakataurite ki te cellulose tūturu,HPMCkua kaha ake te ātete ki te cellulase nā te whakakapinga o ētahi rōpū hydroxyl, ā, kāore e ngāwari te pirau e ngā whākōkī tikanga. Nā tēnei āhuatanga ka whai hua ki a ia te tukunga whakaroa o ngā rongoā i roto i te taiao puku.

Ko te Hydroxypropyl methylcellulose (HPMC) he rauemi pūmua taiao kua whakarerekētia e te matū, he pai te wairewatanga ki te wai, te whakawera wera, te pumau pH, te pumau matū me te pirau koiora. Nā tōna hanganga ahurei me ngā āhuatanga matū, he whānui te whakamahinga o te HPMC i roto i ngā mara rongoā, rauemi hanga, paninga, kai, whakapaipai, me ētahi atu, inā koa i roto i ngā whakatakotoranga e hiahia ana kia matotoru, kia whakahaeretia te tukunga, kia hangaia he kiriata, kia whakatārewatia, kia whakaemulsification me ētahi atu mahi.