Ko te Ether Cellulose he tino karaehe o nga pūhui polymer, e whakamahia nuitia ana i roto i te hanga, te rongoa, te kai me etahi atu mara. I roto ia ratou, ko te HPMC (hydroxypropyl methylcellulose), MC (methylcellulose), HEC (hydroxyethyl cellulose) me te CMC (carboxymethyl cellulose) e wha nga ethers cellulose noa.
Methyl cellulose (MC):
He wairewa te MC ki te wai matao, he uaua ki te memeha ki te wai wera. Ko te wairewa wai he tino pumau i roto i te awhe o te pH=3~12, he pai te hototahi, ka taea te konatunatua ki nga momo surfactants penei i te starch me te guar gum. Ka tae te pamahana ki te mahana o te wai, ka puta te wai.
Ko te pupuri wai o te MC ka whakawhirinaki ki te nui o te taapiri, te pokey, te pai o te matūriki me te tere memeha. Ko te tikanga, he nui te reiti pupuri wai ina he nui te taapiri, he pai nga matūriki me te nui o te pokey. I roto ia ratou, ko te nui o te taapiri he tino paanga ki te reiti pupuri wai, a, ko te taumata pokey kaore i te rite ki te reeti pupuri wai. Ko te tere o te whakakore i te nuinga ka whakawhirinaki ki te tohu whakarereke mata me te pai o te matūriki o nga matūriki cellulose.
Ko nga huringa pāmahana ka tino pa ki te pupuri wai o MC. Ko te tikanga, ka nui ake te pāmahana, ka kino te pupuri wai. Mena ka nui ake te pāmahana moata ki te 40 ° C, ka tino heke te pupuri wai o te MC, ka tino pa ki te mahi hanga o te moata.
He nui te paanga o te MC ki te mahi hanga me te piri o te moata. I konei, ko te "adhesion" e pa ana ki te whakapiringa i waenga i nga taputapu hanga a te kaimahi me te taputapu pakitara, ara, te aukati kutikuti o te moata. Ko te nui ake o te whakapiri, ko te kaha o te kutikuti o te moata, ko te kaha e hiahiatia ana e te kaimahi i te wa e whakamahia ana, me te kino o te mahi hanga o te moata. Ko te piri o te MC kei te taumata waenga i waenga i nga hua cellulose ether.
Hydroxypropyl methylcellulose (HPMC):
He ngawari te rewa a HPMC ki te wai, engari he uaua pea te memeha ki te wai wera. Heoi ano, ko tona pāmahana whakawhanaunga i roto i te wai wera he tino teitei ake i tera o te MC, a he pai ake hoki tona whakarewatanga i roto i te wai matao i to MC.
Ko te paheketanga o te HPMC e pa ana ki te taumaha ngota, me te nui o te pokey ina he nui te taumaha ngota. Ka pa ano te pamahana ki tana pokey, ka heke te pokey i te pikinga o te pāmahana, engari ko te pāmahana e heke iho ai tona pokey he iti iho i to te MC. He pūmau tana otinga i te pāmahana rūma.
Ko te pupuri wai o te HPMC ka whakawhirinaki ki te nui o te taapiri me te pokey, me etahi atu.
He pumau te HPMC ki te waikawa me te kawakore, a ko tana otinga wai he tino pumau ki te awhe pH o 2 ~ 12. He iti te awe o te houra me te wai kotakota ki runga i ana mahi, engari ka taea e te kawakore te whakatere i te reiti memeha me te whakanui ake i te pokey. He pumau te HPMC ki nga tote whanui, engari ka nui te kukū o te otinga tote, ka piki ake te pokey o te otinga HPMC.
Ka taea te whakauru i te HPMC ki te wai-wairewa polymer pūhui ki te hanga i te kākahu, otinga pokey teitei, pērā i te waipiro polyvinyl, māngaro ether, kapia huawhenua, etc.
He pai ake te parenga a te HPMC i te MC, a he iti ake te whakaraerae o tana otinga ki te paheketanga enzymatic i te MC. He pai ake te piri o te HPMC ki te kumete i te MC.
Hydroxyethyl cellulose (HEC):
He wairewa te HEC ki te wai matao, he uaua ki te memeha ki te wai wera. He pūmau te otinga i te pāmahana teitei, ā, karekau he āhuatanga rā. Ka taea te whakamahi i roto i te kumete mo te wa roa i te wera nui, engari he iti ake te pupuri wai i te MC.
He pūmau te HEC ki te waikawa whānui me te kawakore, ka taea e te alkali te whakatere i te whakakorenga me te whakanui ake i te pokey, a he iti ake te whakamararatanga i roto i te wai ki te MC me te HPMC.
He pai te mahi whakatārewatanga o te HEC mo te kumete, engari he roa ake te wa whakamuri o te sima.
He iti ake te mahi a HEC i mahia e etahi umanga a-whare i te MC na te nui o te wai me te kiko o te pungarehu.
Carboxymethyl cellulose (CMC):
Ko te CMC he etera cellulose katote i mahia e te raupapa o nga maimoatanga tauhohenga i muri i te maimoatanga o nga muka maori (pēnei i te miro) ki te kawakawa me te waikawa chloroacetic ka whakamahia hei kaihoko whakaetere. Ko te tohu o te whakakapinga i te nuinga o te waa kei waenga i te 0.4 me te 1.4, a, ko tana mahi ka tino pa ki te tohu o te whakakapi.
Kei a CMC nga paanga whakapumautanga me te whakaemulsification, a ka taea te whakamahi i roto i nga inu kei roto te hinu me te pūmua ki te mahi i te mahi whakaehunga.
He mana pupuri wai a CMC. I roto i nga hua mīti, parāoa, paoa koromamao me etahi atu kai, ka whai waahi ki te whakapai ake i te kiko, ka iti ake te ahua o te wai, ka piki ake te hua, ka whakanui ake i te reka.
Ko te CMC he awe reera ka taea te whakamahi ki te hanga tiēre me te tāmi.
Ka taea e te CMC te hanga kiriata ki runga i te mata o te kai, he whakamarumaru i nga hua me nga huawhenua me te whakaroa i te oranga o nga hua me nga huawhenua.
Ko enei etera cellulose kei a ia ake nga ahuatanga motuhake me nga waahi tono. Ko te kowhiringa o nga hua e tika ana me whakatau i runga i nga whakaritenga tono motuhake me nga tikanga taiao.
Te wa tuku: Oketopa-29-2024