Ko te MC he methyl cellulose, he mea hanga mai i te cellulose ether ma te rongoa i te miro parakore ki te kawakore, te whakamahi i te methane chloride hei kaihoko etherification, me te haere i roto i te raupapa o nga tauhohenga.Ko te tikanga, ko te 1.6~2.0 te tohu whakakapinga, he rereke ano te whakarewatanga me nga nekehanga rereke o te whakakapi.No te ether cellulose kore-ionic.
(1) Ko te pupuri i te wai o te methyl cellulose 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.
(2) Ka whakarewahia 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 surfactants.Ka tae te pamahana ki te mahana o te wai, ka puta te wai.
(3) Ko nga huringa o te pāmahana ka tino pa ki te tere o te pupuri wai o te methyl cellulose.Ko te tikanga, ko te teitei ake o 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.
(4) Ko te Methyl cellulose he painga nui ki te hanga me te whakapiri o te moata.Ko te “adhesion” i konei e pa ana ki te kaha whakapiri i rongohia i waenga i te taputapu tono a te kaimahi me te tïpako pakitara, ara, te parenga kutikuti o te moata.He tiketike te adhesiveness, he nui te parenga kutikuti o te moata, me te kaha e hiahiatia ana e nga kaimahi i roto i te tukanga o te whakamahinga he nui ano hoki, a he kino te mahi hanga o te moata.Ko te piri o te Methyl cellulose kei te taumata ngawari i roto i nga hua cellulose ether.
Ko te HPMC he hydroxypropyl methylcellulose, he katote-kore te cellulose i konatunatua etera i hangaia mai i te miro parakore i muri i te whakamaaramatanga, ma te whakamahi i te propylene oxide me te methyl chloride hei maataki whakaeera, a 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.
(1) He ngawari te wairewa Hydroxypropyl methylcellulose i roto i te wai matao, a ka raru ki te rewa i 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.
(2) Ko te viscosity o te hydroxypropyl methylcellulose e pa ana ki tona taumaha ngota, me te nui ake o te taumaha o te ngota, ka nui ake 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.
(3) 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.
(4) Ko te pupuri i te 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 raro i te nui o te taapiri he nui ake i tera o te methyl cellulose.
(5) Ka taea te whakauru Hydroxypropyl methylcellulose ki te wai-wairewa polymer pūhui ki te hanga i te otinga rite me te teitei pokey.Pērā i te waipiro polyvinyl, te māngaro ether, te kāpia huawhenua, aha atu.
(6) Ko te piri o te hydroxypropyl methylcellulose ki te hanga kumete he teitei ake i tera o te methylcellulose.
(7) Ko te Hydroxypropyl methylcellulose he pai ake te aukati i te methylcellulose, a he iti ake te whakaheke o tana otinga e nga enzymes i te methylcellulose.
Te wa tuku: Apr-17-2023