Ko te ranunga papaku, he mea nui ki te whakapai ake i te mahi hanga moata maroke-ranu, e kapi ana i te neke atu i te 40% o te utu rauemi i roto i te moata maroke-ranu. Ko te nuinga o ngā ranunga i roto i te mākete o roto e tukuna ana e ngā kaihanga o tāwāhi, ā, ko te horopeta tohutoro o ngā hua e whakaratohia ana hoki e ngā kaiwhakarato. Nō reira, kei te teitei tonu te utu o te hua moata maroke-ranu, ā, he uaua ki te rongonui i te moata pereki me te moata parai noa me te nui me te whānuitanga. Ko ngā hua mākete teitei e whakahaerehia ana e ngā kamupene o tāwāhi, ā, he iti ngā hua o ngā kaihanga moata maroke-ranu me te iti o te utu e taea ai te utu; kāore i te whai rangahau pūnaha me te arotahi te whakamahinga o ngā ranunga, ā, e whai matapo ana i ngā tauira o tāwāhi. Anei, ko tā mātou e whakapuaki atu nei ki a koe, he aha te mahi a te hydroxypropyl methylcellulose i roto i ngā ranunga noa o te moata maroke-ranu?
Ko te Hydroxypropyl methylcellulose he momo cellulose kua tere te pikinga o tana putanga me tana whakamahinga i ngā tau tata nei. He mea hanga te Hydroxypropyl methylcellulose ki te miro kua whakatikatikaina i muri i te maimoatanga alkaliization, mā te whakamahi i te propylene oxide me te methyl chloride hei kaihoko etherification, he cellulose kore-ionic i konatunatua ether i hangaia mā roto i te raupapa o ngā tauhohenga. Ko te taumata o te whakakapinga he 1.2~2.0. He rerekē ōna āhuatanga i runga i te ōwehenga o te ihirangi methoxyl me te ihirangi hydroxypropyl. Ko ngā āhuatanga o te hydroxypropyl methylcellulose penei:
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 te wai wera i te methyl cellulose. He nui ake hoki te pai o te wairewatanga 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. Ka 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 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.
5. Ka taea te whakaranu i te Hydroxypropyl methylcellulose ki ngā pūmua 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 pai ake te ātete o te Hydroxypropyl methylcellulose ki ngā whākōkī i te methylcellulose, ā, he iti ake te tūponotanga o te pakaru o tana otinga e te whākōkī i tērā o te methylcellulose.
7. He nui ake te piri o te hydroxypropyl methylcellulose ki te hanganga moata i tō te methylcellulose.
Wā tuku: Mei-09-2023