Uyini umehluko phakathi kwe-HPMC ne-MC?

I-MC yi-methyl cellulose, eyenziwe nge-cellulose ether ngokuphatha ukotini ocwengekile nge-alkali, usebenzisa i-methane chloride njenge-ejenti yokusheshisa, futhi uchungechunge lokuphendula. Ngokuvamile, izinga lokufaka esikhundleni ngu-1.6 ~ 2.0, kanye ne-solubility futhi kwehlukile ngama-degree ahlukene wokufaka esikhundleni. Ingeye-ether engeyona eye-moulsose.

. Ngokuvamile, uma inani lokungeza likhulu, ubuciko buncane, futhi i-viscoty inkulu, inani lokugcina lamanzi liphezulu. Phakathi kwazo, inani lesengezo linomthelela omkhulu kunabo bonke emazingeni okugcinwa kwamanzi, futhi izinga lokubonana alifani ngqo nezinga lamazinga okugcina amanzi. Izinga lokuchithwa ikakhulukazi lincike ezingeni lokuguqulwa komhlaba kwezinhlayiya ze-celluLose kanye nezinhlayiyane izinhlayiyana. Phakathi kwalezi zithambekela ezingenhla kwe-cellulose, i-methyl cellulose ne-hydroxyprosell methyl cellulose zinamazinga aphezulu okugcina amanzi.

(2) I-methylcellulose incanela emanzini abandayo, futhi kuzoba nzima ukuncibilika emanzini ashisayo. Isixazululo sayo esinamanzi sizinzile kakhulu ebangeni le-PH = 3 ~ 12. Inokuhambisana okuhle nesitashi, isiGungu seGum, njll. Futhi ama-surfactants amaningi. Lapho izinga lokushisa lifinyelela izinga lokushisa le-gelation, kwenzeka.

(3) Izinguquko zokushisa zizothinta kakhulu isilinganiso sokugcinwa kwamanzi se-methyl cellulose. Ngokuvamile, izinga lokushisa eliphakeme, elibi kakhulu nokugcinwa kwamanzi. Uma izinga lokushisa lodaka lidlula ama-40 ° C, ukugcinwa kwamanzi kwe-methyl cellulose kuzoncishiswa kakhulu, kuthinte kabi ukwakhiwa kodaka.

(4) I-methyl cellulose inomthelela omkhulu ekwakhiweni nasekunamathiselwe kodaka. I- "Adhesion" Lapha lapha ibhekisela kumandla anamathele azwakala phakathi kwethuluzi lomfakisicelo wesisebenzi kanye nodonga substrate, okungukuthi, ukumelana nokuncipha kodaka kodaka. Ukunamathelayo kuphakeme, ukumelana nokukhula kodaka kukhulu, futhi amandla afunwa yizisebenzi ezisezinhlelweni zokusebenzisa nawo akhulu, futhi ukusebenza kodaka kumpofu. I-Methyl celtulese anhesion isezingeni eliphakathi ku-Cellulose Ether Products.

I-HPMC yi-hydroxypropyllylylyly, okuyi-ether exubile exubile eyenziwe kusuka kukotini ecwengekile ngemuva kokusebenza kwe-alkaliwe, usebenzisa i-propelene oxide kanye ne-methyl chloride njenge-etherization agents, nangochungechunge lokuphendula. Izinga lokufakwa esikhundleni ngokuvamile i-1.2 ~ 2.0. Izakhiwo zalo zihlukile ngenxa yezilinganiso ezihlukile zokuqukethwe kwe-methoxyl nokuqukethwe kwe-hydroxypropyl.

. Kepha izinga lokushisa layo le-gelation emanzini ashisayo liphakeme kakhulu kunalelo ye-methyl cellulose. I-solubity emanzini abandayo nayo yathuthukiswa kakhulu uma iqhathaniswa ne-methyl cellulose.

. Ukushisa futhi kuthinta ukubonakala kwayo, njengoba izinga lokushisa liyanda, ukuhlakanipha kuyancipha. Kodwa-ke, i-viscosity yayo ephezulu inomphumela ophansi wokushisa kune-methyl cellulose. Isixazululo saso sizinzile lapho zigcinwa emazingeni okushisa asekamelweni.

. Amanzi e-caustic kanye nama-lime anomthelela omncane ekusebenzeni kwawo, kepha u-Alkali angasheshisa ukuchitheka kwawo futhi akhuphule ukubonakala kwawo. Hydroxypropyl methylcellulose is stable to common salts, but when the concentration of salt solution is high, the viscosity of hydroxypropyl methylcellulose solution tends to increase.

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. Njengotshwala be-polyvinyl, isitashi ether, gum yemifino, njll.

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