1.Hydroxypropyl methyl cellulose
Hydroxypropyl methylcelluloseHe momo cellulose tēnei e tere piki haere ana te putanga me te whakamahinga. He cellulose kore-ionic i konatunatua ki te ether i hangaia mai i te miro kua whakapaia i muri i te alkaliization, mā te whakamahi i te propylene oxide me te methyl chloride hei kaihoko etherification, mā roto i te raupapa o ngā tauhohenga. Ko te nui o te whakakapinga he 1.2~2.0. Ka rerekē ōna āhuatanga i runga i te ōwehenga o te ihirangi methoxyl ki 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) (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 hoki te pāmahana ki tōna matotoru, i te pikinga o te pāmahana, ka heke te matotoru. Heoi, he iti iho te awe o tōna matotoru me te pāmahana teitei i tō te methyl cellulose. He pumau tōna otinga ina rongoatia ki te pāmahana rūma.
(3) 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.
(4) 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 tere whakarewa 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.
(5) Ka taea te whakaranu i te Hydroxypropyl methylcellulose ki ngā pūmua wairewa-wai hei hanga i tētahi otinga ōrite, he nui ake te matotoru. Pērā i te waipiro polyvinyl, te māngaro ether, te kapia huawhenua, me ētahi atu.
(6) 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.
(7) He nui ake te piri o te hydroxypropyl methylcellulose ki te hanganga moata i tō te methylcellulose.
2. Te pūhui hauwaioraitiri
He mea hanga mai i te miro kua parakoretia kua rongoatia ki te kawakore, ā, ka tauhohe ki te ethylene oxide hei kaihoko etherification i te aroaro o te isopropanol. Ko tōna taumata whakakapinga he 1.5~2.0. He kaha te wai-aroha, ā, he ngāwari ki te mimiti i te makuku.
(1) Ka wairewa te hydroxyethyl cellulose ki te wai matao, engari he uaua ki te wairewa ki te wai wera. Ka pumau tōna otinga i te pāmahana teitei, kāore e whakapūpū. Ka taea te whakamahi mō te wā roa i raro i te pāmahana teitei i roto i te moata, engari he iti ake tōna pupuri wai i tērā o te methyl cellulose.
(2)Te pūhui hauwaioraitiriHe pumau ki te waikawa whānui me te kawakore, ā, ka taea e te kawakore te whakatere i tōna memeha me te whakanui ake i tōna matotoru. He kino ake tōna memeha i roto i te wai i tērā o te methyl cellulose me te hydroxypropyl methyl cellulose.
(3) He pai te mahi ārai-totoka a te Hydroxyethyl cellulose mō te moata, engari he roa ake te wā whakaroa mō te sima.
(4) Ko te mahi a te hydroxyethyl cellulose i hangaia e ētahi umanga ā-rohe he iti iho i te mahi a te methyl cellulose nā te nui o te wai me te nui o te pungarehu.
(5) He tino kino te harore o te wairewa hydroxyethyl cellulose. I te pāmahana o te 40°C, ka puta pea te harore i roto i ngā rā e 3 ki te 5, ka pā ki tōna mahi.
Wā tuku: 28 Paenga-whāwhā 2024