Izici ze-HPMC ngodaka oluhlanganisiwe olomile

1. Izici ze-HPMC ngodaka olujwayelekile

I-HPMC isetshenziswa ikakhulukazi njenge-retarder kanye ne-ejenti yokugcina amanzi kwi-cement ukuqondiswa. Ezakhiweni zikakhonkolo nodaka, kungathuthukisa isilinganiso sokuvuselela kanye ne-shrinkage, ukuqinisa amandla abumbene, futhi uthuthukise isikhathi sokubeka usimende, futhi uthuthukise amandla okuqala kanye namandla okugoba okujwayelekile. Ngoba inomsebenzi wokugcina amanzi, kunganciphisa ukulahlekelwa kwamanzi endaweni kakhonkolo, gwema imifantu emaphethelweni, futhi uthuthukise ukunamathela kanye nokwenza umsebenzi wokwakha. Ikakhulu ekwakheni, isikhathi sokusetha singanwetshwa futhi silungiswe. Ngokukhuphuka kokuqukethwe kwe-HPMC, isikhathi sokubeka udaka sizonwetshwa ngempumelelo; thuthukisa umsebenzi wokukhononda nokuphazamiseka, kufanelekile ukwakhiwa okwenziwe ngomshini; Thuthukisa ukusebenza kahle kokwakha futhi uzuze indawo yokwakha ivikela ngokumelene nesimo sezulu sikasawoti oncibilikisanayo.

2. Izici ze-HPMC ngodaka olukhethekile

I-HPMC i-ejenti esebenza kahle yokugcina amanzi ngodaka lwamanzi owomile, okunciphisa izinga lokugxuma nokuhlehlisa kodaka futhi kuthuthukisa ukubumbana kodaka. Yize i-HPMC inciphisa kancane amandla aguqukayo futhi acindezela udaka, ingakhulisa kakhulu amandla ashubile namandla ebhondi lodaka. Ngaphezu kwalokho, i-HPMC ingavimbela ngempumelelo ukwakheka kwemifantu yepulasitiki emotweni futhi inciphise inkomba yokuqhekeka ngopulasitiki. Ukugcinwa kwamanzi kodaka kukhuphuka ngokwanda kwe-hpmc viscosity, futhi lapho i-viscoty yeqa i-100000MPA Ubumsulwa be-HPMC bunalo nethonya elithile kumazinga okugcina amanzi odaka. Lapho izinhlayiya zihle kakhulu, izinga lokugcina lamanzi lodaka lithuthukile. Ubukhulu bezinhlayiyana ze-HPMC buvame ukusetshenziselwa udaka ngodaka kufanele lube ngaphansi kwama-micron ayi-180 (isikrini se-mesh esingu-80). Umthamo ofanele we-HPMC ku-Dry Powder Botar u-1 ‰ ~ 3 ‰.

2.1. Ngemuva kokuthi i-HPMC ku-motar ichithwe emanzini, ukusatshalaliswa okusebenzayo futhi okufanayo kwezinto eziqinisekisiwe zokulungisa ohlelweni kuqinisekiswa ngenxa yomsebenzi ongaphezulu. Njenge-colloid evikelayo, i-hpmc "isonge" izinhlayiya eziqinile futhi yakha ungqimba endaweni yayo yangaphandle. Ungqimba lwefilimu lokugcoba lwenza uhlelo lodaka luzinze ngokwengeziwe, futhi luthuthukise uketshezi lodaka ngesikhathi senqubo yokuxuba kanye nobushelelezi bokwakhiwa.

2.2. Ngenxa yesakhiwo sayo samangqamuzana, isixazululo se-HPMC senza amanzi odoti abe lula ukulahlekelwa, futhi akhulule kancane kancane isikhathi eside, anikeze udaka ngokugcinwa kwamanzi okuhle nokukhiwa kwamanzi. Kungavimbela amanzi ukuthi ageleze ngokushesha okukhulu kusuka kudaka kuya kwesisekelo, ukuze amanzi agciniwe ahlale ebusweni bezinto ezintsha, ezingakhuthaza i-hydrate yensimbi futhi athuthukise amandla okugcina. Ikakhulu uma i-interface ihlangana nosimende kasimende, udaka, nokunamathela kulahlekelwa ngamanzi, le ngxenye ngeke ibe namandla futhi icishe ibe yibutho elibumbanayo. Ngokuvamile, izindawo ezithintana nazo zithintana nazo zonke izinto zokwakha, zidonsa amanzi angaphezulu komhlaba, okwenza ama-hydration angaphelele ale ngxenye, okwenza amathayela okuphelele kanye namathayela we-ceramic kanye namathayela we-ceramic noma udaka kanye nezindonga ama-bonding amandla phakathi kwezindawo eziphansi.

Lapho kulungiswa udaka, ukugcinwa kwamanzi kwe-HPMC kuwukusebenza okuyinhloko. Kufakazelwe ukuthi ukugcinwa kwamanzi kungaba phezulu njengo-95%. Ukwanda kwesisindo se-molecular se-HPMC kanye nokwanda kwenani likasimende kuzothuthukisa ukugcinwa kwamanzi kanye namandla ebhondi lodaka.

Isibonelo: Njengoba ama-tile anamathela kufanele abe namandla aphezulu ebhondi phakathi kwe-substrate kanye namathayili, ukunamathela kuthinteka yi-adhorption yamanzi kusuka emithonjeni emibili; indawo engaphezulu (yodonga) kanye namathayili. Ikakhulu amathayili, ikhwalithi iyahluka kakhulu, abanye banama-pores amakhulu, futhi amathayili anezinga eliphakeme lokufakwa kwamanzi, okubhubhisa ukusebenza kwe-bondand. I-ejenti yokugcina amanzi ibaluleke kakhulu, futhi ukwengeza i-HPMC ingahlangabezana nale mfuneko.

2.3. I-HPMC iyazinza i-acid ne-alkali, bese kuthi isixazululo saso samanzi sizinzile kakhulu ebusweni bakwa-PH = 2 ~ 12. Amanzi e-caustic kanye nama-lime anomthelela omncane ekusebenzeni kwawo, kepha u-Alkali angasheshisa ukuchitheka kwawo futhi akhulise ukubonwa kwawo kancane.

2.4. Ukusebenza kokwakha kodaka okungezwe nge-HPMC kwathuthukiswa kakhulu. Udaka kubukeka sengathi "unamafutha", angenza amalunga odonga agcwale, abusheleleze phezulu, enza ithayela noma izitini kanye nesisekelo sokusebenza, efanelekile ukwakhiwa kwendawo enkulu.

2.5. I-HPMC iyi-electrolyte engeyona eye-electrolyte ne-non-polymeric, ezizinza kakhulu ngezixazululo zama-aqued anosawoti wensimbi nama-electrolyte ama-organic, futhi angangezwa ekwakheni izinto zokwakha isikhathi eside ukuze aqinisekise ukuqina kwawo.