Ko te MC he methyl cellulose, he mea hanga mai i te cellulose ether mā te rongoā i te miro kua whakapaia ki te kawakore, te whakamahi i te methane chloride hei kaihoko etherification, me te whai i tētahi raupapa o ngā tauhohenga. Ko te tikanga, ko te taumata o te whakakapinga he 1.6~2.0, ā, he rerekē anō hoki te wairewatanga me ngā taumata rerekē o te whakakapinga. Nō te cellulose ether kore-ionic tēnei.
(1) Ko te pupuri wai o te methyl cellulose e whakawhirinaki ana ki te nui o te tāpiri, te matotoru, te pai o te matūriki me te tere whakarewa. I te nuinga o te wā, ki te nui te nui o te tāpiri, he iti te pai, ā, ki te nui te matotoru, he teitei te tere pupuri wai. I roto i ēnei, ko te nui o te tāpiri te mea nui rawa atu te pānga ki te tere pupuri wai, ā, kāore te taumata matotoru e rite tika ki te taumata pupuri wai. Ko te tere whakarewa e whakawhirinaki ana ki te nui o te whakarerekētanga mata o ngā matūriki cellulose me te pai o te matūriki. I roto i ngā cellulose ethers o runga ake nei, he nui ake ngā tere pupuri wai o te methyl cellulose me te hydroxypropyl methyl cellulose.
(2) Ka wairewa te Methylcellulose i roto i te wai matao, ā, he uaua ki te wairewa i roto i te wai wera. He tino pumau tōna wairewa wai i roto i te awhe pH=3~12. He pai te hototahitanga ki te māngaro, te kapia guar, me ētahi atu, me te maha o ngā surfactants. Ina tae te pāmahana ki te pāmahana gelation, ka puta te gelation.
(3) Ka pā kino ngā panonitanga o te pāmahana ki te tere pupuri wai o te methyl cellulose. I te nuinga o te wā, ka nui ake te pāmahana, ka kino ake te pupuri wai. Mena ka neke ake te pāmahana o te moata i te 40°C, ka tino heke te pupuri wai o te methyl cellulose, ka pā kino ki te hanganga o te moata.
(4) He pānga nui tō te methyl cellulose ki te hanganga me te piri o te moata. Ko te "piri" i konei e pā ana ki te kaha piri e pā ana ki te taputapu tono a te kaimahi me te papa pakitara, arā, te ātete kutikuti o te moata. He teitei te piri, he nui te ātete kutikuti o te moata, ā, he nui hoki te kaha e hiahiatia ana e ngā kaimahi i te wā e whakamahia ana, ā, he ngoikore te mahi hanganga o te moata. He taumata taurite te piri o te methyl cellulose i roto i ngā hua cellulose ether.
Ko te HPMC he hydroxypropyl methylcellulose, he ether whakaranu cellulose kore-ionic i hangaia mai i te miro kua whakapaia i muri i te alkaliization, ma te whakamahi i te propylene oxide me te methyl chloride hei kaihoko etherification, me te whakamahi i te raupapa o ngā tauhohenga. Ko te taumata o te whakakapinga he 1.2 ~ 2.0. He rerekē ōna āhuatanga nā te rerekētanga o te ōwehenga o te ihirangi methoxyl me te ihirangi hydroxypropyl.
(1) He ngāwari te wairewa o te Hydroxypropyl methylcellulose ki te wai matao, ā, ka uaua te wairewa ki te wai wera. Engari he nui ake te pāmahana o tōna wairewatanga i roto i te wai wera i tō te methyl cellulose. He nui ake hoki te pai o te wairewatanga i roto i te wai matao ki te whakaritea ki te methyl cellulose.
(2) E pā ana te matotoru o te hydroxypropyl methylcellulose ki tōna taumaha ngota, ā, ki te nui ake te taumaha ngota, ka teitei ake te matotoru. Ka pā anō te pāmahana ki tōna matotoru, i te pikinga o te pāmahana, ka heke te matotoru. Heoi, he iti ake te pānga pāmahana o tōna matotoru teitei i te methyl cellulose. He pumau tōna otinga ina rongoatia ki te pāmahana rūma.
(3) He pumau te Hydroxypropyl methylcellulose ki te waikawa me te alkali, ā, he tino pumau tōna wairewa i te awhe pH=2~12. He iti noa te pānga o te houra kautika me te wai raima ki tōna mahi, engari ka taea e te alkali te tere ake i tōna memeha me te whakanui ake i tōna matotoru. He pumau te Hydroxypropyl methylcellulose ki ngā tote noa, engari ina teitei te kukū o te wairewa tote, ka piki ake te matotoru o te wairewa hydroxypropyl methylcellulose.
(4) Ko te pupuri wai o te hydroxypropyl methylcellulose e whakawhirinaki ana ki te nui o te tāpiri, te matotoru, me ētahi atu, ā, ko tōna tere pupuri wai i raro i te nui tāpiri kotahi he teitei ake i te methyl cellulose.
(5) Ka taea te whakaranu i te hydroxypropyl methylcellulose me ngā matū polymer wairewa-wai hei hanga i tētahi otinga ōrite, matotoru ake. Pērā i te waipiro polyvinyl, te māngaro ether, te kapia huawhenua, me ētahi atu.
(6) He nui ake te piri o te hydroxypropyl methylcellulose ki te hanganga moata i tō te methylcellulose.
(7) He pai ake te ātete o te Hydroxypropyl methylcellulose ki ngā whākōkī i te methylcellulose, ā, he iti ake te tūponotanga ka pakaruhia tōna otinga e ngā whākōkī i te methylcellulose.
Wā tuku: 17 Paenga-whāwhā 2023