Umehluko ku-Physicochemical Properties ye-HPMC ne-HEMC

Izinga lokushisa le-gel liyinkomba ebalulekile ye-cellulose ether. Izixazululo ezinamanzi ze-cellulose ethers zinezakhiwo ze-thermogelling. Njengoba izinga lokushisa likhuphuka, i-viscosity iyaqhubeka nokuncipha. Lapho izinga lokushisa lesisombululo lifinyelela inani elithile, isisombululo se-cellulose ether asisabonakali, kodwa sakha i-colloid emhlophe, futhi ekugcineni ilahlekelwa yi-viscosity yayo. Ukuhlolwa kwezinga lokushisa lejeli kubhekisela ekuqaliseni isampula ye-cellulose ether nge-concentration engu-0.2% yesisombululo se-cellulose ether futhi siyishise kancane emanzini okugeza kuze kube yilapho isixazululo sibonakala ijeli elimhlophe noma elimhlophe, futhi i-viscosity ilahleka ngokuphelele. Izinga lokushisa lesixazululo izinga lokushisa lejeli le-cellulose ether.

Isilinganiso se-methoxy, i-hydroxypropyl ne-HPMC sinethonya elithile ekuncibilikeni kwamanzi, umthamo wokubamba amanzi, umsebenzi ongaphezulu kanye nezinga lokushisa lejeli lomkhiqizo. Ngokuvamile, i-HPMC enokuqukethwe okuphezulu kwe-methoxyl nokuqukethwe kwe-hydroxypropyl ephansi kunokuncibilika kahle kwamanzi nomsebenzi omuhle wangaphezulu, kodwa izinga lokushisa lejeli liphansi: ukukhulisa okuqukethwe kwe-hydroxypropyl nokunciphisa okuqukethwe kwe-methoxy kungakhuphula izinga lokushisa lejeli. Kodwa-ke, okuqukethwe okuphezulu kakhulu kwe-hydroxypropyl kuzonciphisa izinga lokushisa lejeli, ukuncibilika kwamanzi kanye nomsebenzi ongaphezulu. Ngakho-ke, abakhiqizi be-cellulose ether kumele balawule ngokuqinile okuqukethwe kweqembu ukuze baqinisekise ikhwalithi yomkhiqizo ezinzile.

Isicelo semboni yezokwakha

I-HPMC kanye ne-HEMC banemisebenzi efanayo ezintweni zokwakha. Ingasetshenziswa njenge-dispersant, i-ejenti yokugcina amanzi, i-thickener, i-binder, njll. Isetshenziswa kakhulu ekubunjweni kodaka lukasimende kanye nemikhiqizo ye-gypsum. Isetshenziselwa udaka lukasimende ukwandisa ukubumbana nokusebenza kwayo, ukunciphisa ukugeleza, ukwandisa i-viscosity kanye nokuncipha, futhi inemisebenzi yokugcinwa kwamanzi, ukunciphisa ukulahlekelwa kwamanzi endaweni ekhonkolo, ukwandisa amandla, ukuvimbela imifantu kanye nesimo sezulu sikasawoti oncibilikayo emanzini, njll. Kusetshenziswa kakhulu kusimende, igypsum, udaka nezinye izinto. Ingasetshenziswa njenge-ejenti eyenza ifilimu, i-thickener, i-emulsifier kanye ne-stabilizer yopende we-latex nopende we-resin oncibilika emanzini. Inokumelana nokugqokwa okuhle, ukufana nokunamathela, ithuthukisa ukungezwani kwendawo, ukuzinza kwe-acid-base kanye nokuhambisana nombala we-metallic. Ngenxa yokuzinza kwayo kwesitoreji esihle se-viscosity, ifaneleka ngokukhethekile njenge-dispersant e-emulsion coatings. Sekukonke, nakuba uhlelo luncane, lusebenza kahle futhi lunohlu olubanzi lwezinhlelo zokusebenza.

Izinga lokushisa lejeli le-cellulose ether linquma ukuzinza kwalo okushisayo ekusetshenzisweni. Izinga lokushisa lejeli le-HPMC livamise ukuba phakathi kuka-60°C no-75°C, kuye ngohlobo, okuqukethwe kweqembu kanye nenqubo yokukhiqiza yabakhiqizi abahlukene. Ngenxa yezici zeqembu le-HEMC, izinga lokushisa layo le-gelation liphakeme kakhulu, ngokuvamile lingaphezu kuka-80 ° C, ngakho ukuzinza kwalo emazingeni okushisa aphezulu kuthiwa kubangelwa i-HPMC. Ekusetshenzisweni okungokoqobo, endaweni yokwakhiwa kwehlobo elishisayo, umthamo wokubamba amanzi we-HEMC nge-viscosity efanayo kanye nomthamo ungcono kune-HPMC. Ikakhulukazi eningizimu, udaka ngezinye izikhathi lusetshenziswa emazingeni okushisa aphezulu. I-cellulose ether yejeli yezinga lokushisa eliphansi izolahlekelwa imiphumela yayo yokuqina nokugcina amanzi emazingeni okushisa aphezulu, ngaleyo ndlela isheshise ukuqina kodaka lukasimende futhi ithinte ngokuqondile ukwakhiwa nokumelana nokuqhekeka.

Ngoba kunamaqembu amaningi e-hydrophilic esakhiweni se-HEMC, ine-hydrophilicity engcono. Ngaphezu kwalokho, ukumelana nokugeleza okuqondile kwe-HEMC nakho kuhle kakhulu. Umphumela wokusetshenziswa kwe-HPMC ku-adhesive tile uzoba ngcono.