I-MC yi-methyl cellulose, etholakala ngokuphatha ukotini ocwengekile nge-alkali, usebenzisa i-methyl chloride njenge-ejenti yokuphelisa, nokwenza i-cellulose ether ngochungechunge 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.
(1) Ukugcinwa kwamanzi kwemethyl celluloseKuya ngenani layo lezengezo, i-viscosity, inhlawulo yezinhlayiyana kanye nezinga lokuqothula. Ngokuvamile, uma inani lokungeziwe likhulu, ubuciko buncane, futhi i-viscoty inkulu, izinga lokugcina amanzi liphezulu. Phakathi kwazo, inani lokungezelela linethonya elikhulu kunawo wonke kumanani okugcinwa kwamanzi, futhi izinga lokubona alikho lilingana nezinga lokugcinwa kwamanzi. Izinga lokuchithwa ikakhulukazi lincike ezingeni lokuguqulwa komhlaba kwezinhlayiya ze-cellulose nobunzima bezinhlayiya. Phakathi kwalezi zithambekela ezingenhla kwe-cellulose, i-methyl cellulose ne-hydroxyprosell methyl cellulose zinamazinga aphezulu okugcina amanzi.
. Inokuhambisana okuhle nesitashi, isiGungu seGum, njll. Futhi ama-surfactants amaningi. Lapho amazinga okushisa efinyelela emazingeni okushisa we-gelation, kwenzeka into ye-gelation.
(3) Ukuguqulwa kwezinga lokushisa kuzothinta 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 kuzoba kubi kakhulu, okuzothinta kakhulu ukusebenziseka kodaka.
(4) I-methyl cellulose inomthelela omkhulu ekusebenzeni nasekunamathisweni kodaka. "Adhesion" lapha kubhekisa ekuhlolweni okuzwakala phakathi kwethuluzi lomfakisicelo lomsebenzi kanye nodonga substrate, okungukuthi, ukumelana nokugula kodaka kodaka. Ukunamathelisa kukhulu, ukumelana nokuphefumula kodaka kukhulu, futhi amandla afunwa ngabasebenzi enqubweni yokusebenzisa nawo inkulu, futhi ukwakhiwa kodaka kumpofu. I-Methylcellose Adhesion isezingeni eliphakathi ku-Cellulose Ether Products.
I-HPMC yi-hydroxypropylylylylylylylyllose, okuyi-ether ye-ether exubile eyenziwe kusuka kukotini ecwengekile ngemuva kokwelashwa kwe-alkali, usebenzisa i-proplemade oxide kanye ne-methyl chloride njenge-etherifing agents, nangochungechunge lokuphendula. Izinga lokufakwa esikhundleni ngokuvamile lingu-1,2 kuya ku-2.0. Izakhiwo zayo ziyahlukahluka ngokuya ngengxenye yokuqukethwe kwe-methoxyl nokuqukethwe kwe-hydroxypropyl.
(1) I-Hydroxypropylllylylylyll ilulaza kalula emanzini abandayo, kepha izobhekana nobunzima ekunciphiseni emanzini ashisayo. Kepha izinga lokushisa layo le-gelation emanzini ashisayo liphakeme kakhulu kunalelo ye-methyl cellulose. Ukuchithwa kwamanzi abandayo nakho kuthuthukiswa kakhulu uma kuqhathaniswa ne-methyl cellulose.
. Ukushisa futhi kuthinta ukubonakala kwayo, njengoba izinga lokushisa liyanda, ukuhlakanipha kuyancipha. Kepha ukubonakala kwayo kuthinteka kancane ngokushisa okuphezulu kune-methyl cellulose. Isixazululo saso sizinzile kwisitoreji emazingeni okushisa asekamelweni.
. Amanzi e-caustic kanye nama-lime anomthelela omncane ekusebenzeni kwawo, kepha u-Alkali angasheshisa ukuchitheka kwawo futhi akhuphule ukubonwa. I-Hydroxypropyllylylyl iqinile kusawoti ojwayelekile, kepha lapho ukugcwaliswa kwesawoti kuphezulu, ukubonwa kwe-hydroxypropyllllylylylylylylylylylylylylylylylylylylylylylylylylylylylylylylylylylylylylylylylyllylylylylylylylylylylylylylylylylyllylylylylylyllylylylylylylylylyllylylyllylylylyllylylylylylyllylylylylyllylyllylyllylylylyllose methylcellulose kuvimbela ukwanda.
(4) Ukugcinwa kwamanzi kwehydroxypropyl methylcelluloseKuya ngesamba sayo sokungezwa, i-viscosity, njll. Izinga lokugcina amanzi ngaphansi kwenani elifanayo lengezo liphakeme kunalolo lwe-methyl cellulose.
. Njengotshwala be-polyvinyl, isitashi ether, gum yemifino, njll.
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Isikhathi Seposi: APR-28-2024