Methylcellulose (MC)
Ko te tātai rāpoi o te methylcellulose (MC) ko:
[C6H7O2(OH)3-h(OCH3)n\]x
Ko te tukanga whakaputa ko te hanga cellulose ether na roto i te maha o nga tauhohenga i muri i te maimoatanga o te miro parakore ki te kawakawa, ka whakamahia te methyl chloride hei kaihoko whakamaarama. Ko te tikanga, ko te tohu whakakapinga ko te 1.6~2.0, he rereke ano te whakarewatanga me nga nekehanga rereke o te whakakapi. No te ether cellulose kore-ionic.
He wairewa te Methylcellulose ki te wai matao, a ka uaua te memeha ki te wai wera. He tino pumau tona otinga wai i te awhe pH=3~12.
He pai te hototahitanga ki te māngaro, kapia guar, aha atu me te maha o nga haumanu. Ka tae te pamahana ki te mahana o te wai, ka puta te wai.
Ko te pupuri wai o te methylcellulose e whakawhirinaki ana ki te nui o te taapiri, te pokey, te pai o te matūriki me te tere memeha.
Ko te tikanga, mena he nui te taapiri, he iti te pai, he nui te pokey, he nui te reeti pupuri wai. I roto i a raatau, ko te nui o te taapiri he tino paanga ki te reiti pupuri wai, a, ko te taumata o te potata kaore i te rite ki te taumata o te reeti pupuri wai. Ko te tere o te whakakore i te nuinga ka whakawhirinaki ki te tohu o te whakarereketanga o te mata o nga matūriki cellulose me te pai o te matūriki.
I roto i nga ethers cellulose i runga ake nei, ko te methyl cellulose me te hydroxypropyl methyl cellulose he teitei ake te reiti pupuri wai.
Carboxymethylcellulose (CMC)
Ko te Carboxymethyl cellulose, e mohiotia ana ko te konutai carboxymethyl cellulose, e mohiotia ana ko te cellulose, cmc, me etahi atu, he polymer linear anionic, he tote konutai o te cellulose carboxylate, he mea whakahou me te kore e pau. Matū rawa.
Kei te whakamahia te nuinga i roto i te ahumahi hopii, ahumahi kai me te mara hinu keri wai, a ko te nui e whakamahia ana i roto i te poke anake kaute mo te 1%.
Ko te Ether cellulose katote he mea hanga mai i nga muka taiao (katunu, me etahi atu) i muri i te maimoatanga alkali, te whakamahi i te konutai monochloroacetate hei kaihoko etherification, me te whai i te raupapa o nga maimoatanga tauhohenga.
Ko te tohu o te whakakapi i te nuinga o te 0.4 ~ 1.4, a ko tana mahi ka tino pa ki te tohu o te whakakapi.
He pai te herenga o te CMC, he pai te kaha o tana otinga wai, engari karekau he uara rerekee kirihou.
Ka rewa te CMC, ka puta te depolymerization. Ka piki ake te pokey i te wa e memeha ana, ka puta ki te teitei, ka heke ki te paparahi. Ko te pokey ka puta he hononga ki te depolymerization.
Ko te tohu o te depolymerization e hono tata ana ki te nui o te whakarewa ngoikore (wai) i roto i te waihanga. I roto i te punaha whakarewa ngoikore, penei i te toothpaste kei roto te glycerin me te wai, e kore te CMC e tino whakaheke, ka tae ki te waahi taurite.
I roto i te take o te kukū wai homai, te CMC tino whakakapia hydrophilic he māmā ake ki te depolymerize i te CMC whakakapi iti.
Hydroxyethylcellulose (HEC)
Ka mahia te HEC ma te rongoa i te miro parakore ki te kawakawa, katahi ka tauhohe ki te ethylene oxide hei kaihoko whakaetere i te aroaro o te acetone. Ko te tohu o te whakakapinga ko te tikanga 1.5~2.0. He kaha te hydrophilicity me te ngawari ki te tango i te makuku.
He wairewa te Hydroxyethyl cellulose ki te wai matao, engari he uaua ki te memeha ki te wai wera. He pūmau tana otinga i te pāmahana teitei kaore he reera.
He pumau ki nga waikawa me nga kawakore noa. Ka taea e te Alkalis te whakatere i tona whakakorenga me te whakanui paku i tona pokey. Ko tona mararatanga i roto i te wai he paku kino atu i tera o te methyl cellulose me te hydroxypropyl methyl cellulose.
Hydroxypropyl Methyl Cellulose (HPMC)
Ko te tātai rāpoi o HPMC ko:
\[C6H7O2(OH)3-mn(OCH3)m,OCH2CH(OH)CH3\]n\]x
Ko te Hydroxypropyl methylcellulose he momo cellulose kei te tere haere te whakaputa me te kai.
He katote-kore-kore-a-roto i konatunatua te etera mai i te miro parakore i muri i te whakamaaramatanga, ma te whakamahi i te propylene oxide me te methyl chloride hei kaihoko etherification, na roto i te raupapa tauhohenga. Ko te tohu o te whakakapinga ko te tikanga 1.2~2.0.
He rereke ona ahuatanga na te rereke o nga owehenga o te ihirangi methoxyl me te ihirangi hydroxypropyl.
He ngawari te wairewa Hydroxypropyl methylcellulose i roto i te wai matao, engari ka uaua te rewa ki te wai wera. Engari he tino teitei ake te pāmahana o te wai wera i tera o te methyl cellulose. Ko te memehatanga i roto i te wai matao ka tino pai ake ki te methyl cellulose.
Ko te viscosity o te hydroxypropyl methylcellulose e pa ana ki tona taumaha ngota, me te nui o te taumaha ngota, te teitei ake o te viscosity. Ka pa ano te pamahana ki tona pokey, i te pikinga o te pāmahana, ka heke te pokey. Heoi, he iti ake te paanga o tona pokey teitei i te methyl cellulose. He pūmau tana otinga ina penapena ki te pāmahana rūma.
Ko te pupuri wai o te hydroxypropyl methylcellulose e whakawhirinaki ana ki te nui o te taapiri, te viscosity, me etahi atu, me te tere o te pupuri wai i te nui o te taapiri he nui ake i tera o te methyl cellulose.
Ko te Hydroxypropyl methylcellulose he pumau ki te waikawa me te kawakawa, a he tino pumau tona otinga wai i roto i te awhe o te pH = 2 ~ 12. He iti te paanga o te houra me te wai kotakota ki runga i ana mahi, engari ka taea e te kawakore te tere ake i te memeha me te whakanui ake i te pokey.
Ko te Hydroxypropyl methylcellulose he pumau ki nga tote noa, engari ka nui te kukū o te wairewa tote, ka piki ake te pokey o te otinga hydroxypropyl methylcellulose.
Ko te Hydroxypropyl methylcellulose ka taea te konatunatua ki nga pūhui polymer wairewa-wai hei hanga i tetahi otinga pokey teitei ake. Pērā i te waipiro polyvinyl, te māngaro ether, te kāpia huawhenua, aha atu.
Ko te Hydroxypropyl methylcellulose he pai ake te atete i te methylcellulose, a he iti ake te kino o tana otinga i te methylcellulose.
Wā tuku: Feb-14-2023