Methyl Cellulose (MC) tātai rāpoi \[C6H7O2(OH)3-h(OCH3)n1] x Ka tukuna te miro parakore ki te kawakawa, ka whakamahia te methyl chloride hei kaihoko whakakaha.I muri i te raupapa o nga tauhohenga, ka whakahaerehia te maimoatanga cellulose ether.Ko te tikanga, ko te tohu o te whakakapinga he 1.6~2.0, he rereke te tohu o te whakakapi.No te ether cellulose kore-ionic.
1. Ka whakarewahia te Methylcellulose ki te wai matao, ka raru te wai wera, ka tino pumau te awhe pH o te wairewa wai i waenga i te 3/12.He hototahi ake te māngaro, te kapia guar me te maha atu o nga wairewa.Ka puta te wetewete ina tae te pamahana ki te pāmahana wetewete.
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 ka whakanuia, he iti, he pokey teitei, he pupuri wai teitei.I roto i a raatau, ko te pupuri i te wai te tino paanga, a, ko te taumata pokey e kore e rite ki te 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 nga matūriki.I roto i nga ethers cellulose i runga ake nei, ko te methyl cellulose me te hydroxypropyl methyl cellulose he nui te pupuri wai.
Ko nga huringa pamahana ka tino pa ki te pupuri wai o te methyl cellulose.– Ki te teitei 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 methyl cellulose, ka tino pa ki te hanga o te moata.
He nui te paanga o te Methylcellulose ki te mahi me te piri o te moata.Ko te “piri” i konei e pa ana ki te whakapiringa i waenga i te taputapu tono a te kaimahi me te tïpako pakitara, ara, te parenga kutikuti o te moata.Ko te Viscosity, te kaha o te kutikuti moata, me te kaha e hiahiatia ana e nga kaimahi e whakamahia ana he tino nui, a, kaore i te pai te hanga moata.Ko te Methylcellulose i piri ki nga taumata ngawari i roto i nga hua ether cellulose.
2. Hydroxypropyl methylcellulose (HPMC) [C 6 H 7 O 2 (OH) 3-mn (OCH 3 ) m, OCH 2 CH (OH) CH 3 ] n]] hydroxypropyl methyl cellulose I nga tau tata nei, ko nga momo cellulose he tere haere.He katote-kore-a-roto i konatunatua etera e te raupapa o nga tauhohenga i muri i te whakamaaramatanga o te kawakore miro parakore, i whakamahia ai te propylene oxide me te methyl chloride hei kaihoko whakaeera.Ko te tohu whakakapinga ko te tikanga 1.2/2.0.He rereke ona ahuatanga i runga i te ōwehenga o te ihirangi methoxyl me te ihirangi hydroxypropyl.
1. Kua wehea te Hydroxypropyl methylcellulose ki te momo wera-rewa me te momo tere.He tino teitei ake te wera o te wai wera i tera o te methylcellulose.He pai ake te whakapai ake i te methylcellulose ina rewa ki te wai matao.
Ko te viscosity o te hydroxypropyl methylcellulose e pa ana ki te taumaha ngota, a he nui te taumaha o te ngota.Ka pa ano te pamahana ki tona pokey, i te pikinga o te pāmahana, ka heke te pokey.Heoi, he iti ake te awe o te pāmahana ki te pokey i to te methyl cellulose.Ko te otinga he pumau te rokiroki i te pāmahana rūma.
3. Ko te pupuri i te wai o te hydroxypropyl methylcellulose e whakawhirinaki ana ki te nui o te taapiri, te pokey, me etahi atu, a ko te tere o te pupuri wai o taua nui ka nui ake i tera o te methyl cellulose.
4. Ko te Hydroxypropyl methylcellulose he pumau ki te waikawa me te kawakore, a he tino pumau tona otinga wai i roto i te awhe pH o 2/12.Ko te mahi o te houra me te wai kotakota karekau he awe nui, engari ka taea e te alkali te whakatere i tona reeti memeha, ka piki ake 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 polymers wairewa-wai hei hanga i tetahi otinga rite, teitei-pokey.Pērā i te waipiro polyvinyl, te māngaro ether, te kāpia huawhenua, aha atu.
Ko te Hydroxypropyl methylcellulose he pai ake te aukati i te methylcellulose, he iti ake te kaha o te whakahekenga enzymatic o tana otinga i tera o te methylcellulose, me te whakapiri o te hydroxypropylmethylcellulose ki te hanga moata he teitei ake i tera o te methylcellulose.te pūirau turanga.
Ko te toru, ko te hydroxyethyl cellulose (HEC) he mea hanga mai i te miro para parakore kua rongoatia ki te kawakawa, i te aroaro o te acetone, me te ethylene oxide hei kaihoko whakakaha.Ko te nuinga o te waa ko te 1.5/2.0 te tohu whakakapinga.He kaha te hydrophilicity me te ngawari ki te tango i te makuku.
1. He wairewa te Hydroxyethyl cellulose ki te wai matao, engari 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 mo te wa roa i roto i te kumete wera nui, engari he iti ake te pupuri i te wai i tera o te methyl cellulose.
2. Hydroxyethyl cellulose he pūmau ki te waikawa whānui me te alkali.Ka whakatere te Alkali i tona memehatanga, ka piki paku te pokey.Ko tona marara ki te wai he paku kino atu i tera o te methyl cellulose me te hydroxypropyl methyl cellulose.
3. He pai te mahi anti-iri a Hydroxyethyl cellulose i runga i te kumete, engari mo te wa roa, he iti ake te mahi a etahi hydroxyethyl cellulose i te kainga i te methyl cellulose na te nui o te wai me te nui o te pungarehu.
4. Carboxymethyl cellulose (CMC) \ [C6H7O2 (OH) 2och2COONa] (cotton, etc.) o te muka taiao ka tukinotia ki te alkali, ka whakamahia te konutai chloroacetate hei kaihoko etherification, i muri i te raupapa o nga maimoatanga tauhohenga, ka hangaia hei katote. ether cellulose.Ko te tohu whakakapinga ko te tikanga 0.4/1.4, a ko te tohu whakakapinga he nui ake te paanga ki te mahi.
Ko te Carboxymethyl cellulose he hygroscopicity teitei, a ko nga tikanga rokiroki he nui ake te wai.
2. Karekau te wairewa aqueous Carboxymethyl cellulose e whakaputa he ra, ka heke te pokey ina kake te pāmahana, ka kore e taea te whakahuri ina neke atu te mahana i te 50°C.
Ko tona pumau ka tino pa ki te pH.Ko te tikanga ka whakamahia mo te moata gypsum, kaua mo te kumete ciment.I roto i te take o te alkalinity tiketike, ka ngaro tona pokey.
He iti ake te pupuri wai i tera o te methyl cellulose.Ko te moata gypsum he whakaroa, he whakaheke i te kaha.Engari ko te utu o te carboxymethyl cellulose he tino iti ake i tera o te methyl cellulose.
Te wa tuku: Hanuere-13-2023