Igama lesiShayina le-HPMC liyi-hydroxypropyllylyly methylcellulose. Akukona i-ionic futhi kuvame ukusetshenziswa njenge-ejenti egcina amanzi obulaka olomile. Kuyinto esetshenziswa kakhulu esetshenziswayo yokugcina amanzi kudaka.
Inqubo yokukhiqiza ye-HPMC ikakhulukazi umkhiqizo osuselwa ku-polysaccharide okhiqizwa yi-alkalization kanye nokuthezeka kwe-fiber tatton (kwasekhaya). Akukhokhisi ngokwayo, akenzi ama-ion ashajisiwe ezintweni ezizinzile, futhi anokusebenza okuzinzile. Intengo ibuye iphansi kunezinye izinhlobo ze-cellulose afer, ngakho-ke isetshenziswa kabanzi ngodaka oluxutshwe.
Umsebenzi we-hydroxypropyllllylykyl: kungakhula ngodaka olusanda kuxutshwa ukuze ube nokuvunywa okuthile okumanzi futhi kuvikele ukuhlukaniswa. (Ukuqina) Ukugcinwa kwamanzi nakho kuyisici esibaluleke kunazo zonke, esisiza ukugcina inani lamanzi akhululekile kudaka, ukuze kusakhiwe ngodaka, impahla enamanzi inesikhathi esithe xaxa sokwenza hydrate. (Ukugcinwa kwamanzi) Inezindawo zokufaka umoya, ezingaletha ama-bubble ayunifomu kanye nama-air air ukuthuthukisa ukwakhiwa kodaka.
Lapho kuphakama i-viscoxyprotity methylcellose ether, okungcono ukusebenza kokugcinwa kwamanzi. I-Viscosity iyipharamitha ebalulekile yokusebenza kwe-HPMC. Njengamanje, abakhiqizi be-HPMC abahlukene basebenzisa izindlela ezahlukahlukene nezinsimbi ukukala ukubonakala kwe-HPMC. Izindlela eziphambili zinguHakerotovisko, i-HIPPLER, ubuSbhelohde neBrookfield.
Ngomkhiqizo ofanayo, imiphumela ye-visacosity elikalwe ngezindlela ezahlukahlukene ihluke kakhulu, kanti ezinye zize zize ziphindwe kabili umehluko. Ngakho-ke, lapho kuqhathaniswa nokubonakala, kufanele kwenziwe phakathi kwezindlela ezifanayo zokuhlola, kufaka phakathi izinga lokushisa, i-rotor, njll. Mayelana nosayizi wezinhlayiyana, icweyiphile, ukugcinwa kwamanzi, okungcono ukugcinwa kwamanzi. Ngemuva kwezinhlayiya ezinkulu ze-cellulose ether zithintana namanzi, ingaphezulu lincibilika ngokushesha futhi lakha ijeli lokusonga lokho kuvimbela ama-molecule wamanzi ukuthi aqhubeke nokungena ekutholeni ukungena ngaphakathi. Kwesinye isikhathi akunakusakazwa ngokufana futhi kuncibilike ngisho nangemva kokushukumisa isikhathi eside, kwakha isixazululo esinamafu esinamafu noma i-agglomeration. Kuthinta kakhulu ukugcinwa kwamanzi kwe-cellulose ether, futhi i-solubility kungenye yezinto zokukhetha i-cellulose ether.
I-Fechness nayo iyinkomba yokusebenza ebalulekile ye-methyl celtulose ether. I-MC esetshenziselwa udaka lwe-powder eyomile iyadingeka ukuba ibe yimpuphu, okuqukethwe kwamanzi okuphansi, nobuciko futhi kudinga ama-20% ~ 60% kasayizi wezinhlayiyana kube ngaphansi kwama-63um. Ubunzima buthinta i-solubility ye-hydroxypropylylylylylyllose ether. I-Coarse MC imvamisa i-granular, futhi kulula ukuyiyeka emanzini ngaphandle kwe-agglomeration, kepha izinga lokuchithwa lihamba kancane, ngakho-ke alilungele ukusetshenziswa ngodaka lwempuphu owomile.
Ku-powder eyomile, i-MC ihlakazeka phakathi kwezinto zokubhala ezifana ne-aggregate, i-filler enhle kanye nosimende, futhi i-powder enhle kuphela engavikela ama-methyl cellulose agglomeration lapho uxubana namanzi. Lapho i-MC ingezwa ngamanzi ukuncibilikisa ama-agglomerates, kunzima kakhulu ukusakazeka futhi uncibilike. Ubude obuhle be-MC akugcini nje ngokuchitheka, kodwa futhi kunciphisa amandla endawo odaka. Lapho kufakwa i-powder eyomile endaweni enkulu, ijubane lokuphulukisa kodaka lwe-powder owomile lwasendaweni luzoncishiswa kakhulu, futhi imifantu izovela ngenxa yezikhathi ezihlukile zokwelapha. Owesifazane ofafazwe onokwakhiwa kwemishini, imfuneko yobunzima iphakeme ngenxa yesikhathi esifushane sokuxuba. Ngokuvamile ukukhuluma, ukukhuphuka okuphezulu, kungcono ukugcinwa kwamanzi. Kodwa-ke, ukukhuphuka kwesisindo kanye nesisindo se-molecular se-MC, ukwehla okuhambisanayo kwe-solubelity yayo kuzoba nomthelela ongemuhle emandleni nasekusebenzeni kokwakha kodaka.
Lapho kuphakama i-viscosity, kusobala kakhulu umphumela wokuqina kudaka, kepha akayona ngokuqondile. Lapho esekhuphuka i-viscosity, i-viscous mores owesimende izoba khona, okungukuthi, ngesikhathi sokwakha, kubonakaliswa njengokunamathela ku-scraper kanye nokunamathela okuphezulu kuya engxenyeni engezansi. Kepha akusizi ukwandisa amandla wesakhiwo sodaka olumanzi uqobo. Okungukuthi, ngesikhathi sokwakha, ukusebenza kwe-anti-sag akubonakali. Ngokuphambene nalokho, ukubonakala okuphakathi nendawo okuphansi kepha okulungiselelwe i-methyl cellulose kanye nokusebenza okuhle kakhulu ekuthuthukiseni amandla wesakhiwo sodaka lwamanzi.
Ukugcinwa kwamanzi kwe-HPMC kuhlobene nokushisa okusetshenzisiwe, nokugcinwa kwamanzi kwe-methyl cellulose ether kuncipha ngokwanda kokushisa. Kodwa-ke, kuzinhlelo zokusebenza zangempela zezinto ezibonakalayo, udaka owomile lwe-powder luvame ukusetshenziswa ezindaweni ezishisayo ezishisayo emazingeni okushisa aphezulu (aphezulu kunama-degree angaphandle aphezulu, okuvame ukusheshisa ukwelashwa kuka usimende kanye nokwenza lukhuni udaka owomile lwempuphu. Ukwehla kwezinga lokugcina amanzi kuholela emvelweni osobala wokuthi zombili ukuwenza nokumelana nokuqhekeka kuyathinteka, futhi kubaluleke kakhulu ukunciphisa ithonya lezinto zokushisa ngaphansi kwalesi simo ngaphansi kwalesi simo.
Kulokhu, i-methyl hydroxyethylyl cellulose ether angeza njengamanje ithathwa njengendlela ephambili yentuthuko yezobuchwepheshe. Yize inani le-methyl hydroxyethyllls inyuswa (ifomula yehlobo), ukusebenziseka kanye nokumelana nokuqhekeka namanje akwazanga ukufeza izidingo zokusebenzisa. Ngokusebenzisa okuthile okukhethekile ku-MC, njengokukhulisa izinga lokuthezeka, njll., Umphumela wokugcinwa kwamanzi ungagcinwa emazingeni okushisa aphezulu, ukuze akwazi ukuhlinzeka ukusebenza okungcono ngaphansi kwezimo ezinzima.
Umthamo we-HPMC akufanele abe phezulu kakhulu, ngaphandle kwalokho uzokwandisa ukufunwa kwamanzi kodaka, kuzonamathela ku-trowel, futhi isikhathi sokusetha sizoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu, okuzoba yinde kakhulu. Imikhiqizo ehlukene yodaka Sebenzisa i-HPMC ene-viscosities ehlukile, futhi ungasebenzisi i-HPMC ephezulu kakhulu ye-HPMC. Ngakho-ke, yize imikhiqizo ye-hydroxypropylly ilungile, zihalalisiwe lapho zisetshenziswa kahle. Ukukhetha i-HPMC efanelekile kungumthwalo wemfanelo oyinhloko wabasebenzi belebhu yebhizinisi. Njengamanje, abathengisi abaningi abangathembeki bahlanganisa i-HPMC, futhi ikhwalithi imbi impela. Lapho ukhetha i-cellulose ethile, ilabhorethri kufanele yenze umsebenzi omuhle kulolo cwaningo ukuqinisekisa ukuqina komkhiqizo wodaka, futhi ungabi nokuhaha ngokulahleka futhi kubangele ukulahleka okungadingekile futhi kubangele ukulahleka okungadingekile.
Isikhathi sePosi: Meyi-04-2023