Ekusetshenzisweni kwei-hydroxypropyl methyl cellulose HPMC, sivame ukuthola ukuthi ngokuyisisekelo ihlukaniswe izinhlobo ezimbili: ukuncibilika okusheshayo nokuncibilika kancane. Ake siqonde umehluko phakathi kokuncibilika okusheshayo nokuncibilika kancane kwe-hydroxypropyl methyl cellulose.
I-HPMC esheshayo ibhekisela ekusetshenzisweni kwe-ejenti yokuxhumanisa ukuze kulungiswe ubuso enqubweni yokukhiqiza, ukuze i-HPMC ikwazi ukusabalala ngokushesha emanzini abandayo, kodwa hhayi ikhambi langempela, ngokuxubha okufanayo, i-viscosity ikhuphuka kancane kancane, okungukuthi, ukuncibilika;
I-HPMC encibilikayo kancane ingabizwa nangokuthi imikhiqizo encibilikayo eshisayo. Uma kutholakala amanzi abandayo, angasakazwa ngokushesha emanzini ashisayo. Ngokuxuba ngokulinganayo, izinga lokushisa lesisombululo lizokwehla liye ezingeni lokushisa elithile. (Izinga lokushisa lejeli yethu lingaba ngu-60°C), i-viscosity izovela kancane kuze kube yilapho kwakheka ijeli ecacile nenamathelayo.
Nasi umehluko phakathi kwesisombululo esisheshayo nesisombululo esisheshayo. Uma unemibuzo mayelana nalolu lwazi, ungaxhumana nathi.
I-Hydroxypropyl methyl celluloseI-HPMCukulibazisa ukumuncwa kwesimende
Ukufaka i-hydroxypropyl methyl cellulose kusimende kunciphisa ijubane lokumuncwa kwayo. Ngakho-ke yini oyaziyo ngendlela esebenza ngayo? Ake sibheke i-hydroxypropyl methyl cellulose ukuze kubambezeleke ukumuncwa kwesimende. Isimiso.
1. I-hypothesis ye-ion movement disorder
Sicabange ukuthi i-hydroxypropyl methyl cellulose izokwandisa i-viscosity yezixazululo ze-pore, ivimbele izinga lokunyakaza kwe-ionic, futhi ilibazise i-hydration yesamente. Kodwa-ke, ama-ether e-cellulose e-viscosity aphansi kulolu vivinyo ayenamandla aqinile okulibazisa i-hydration yesamente. Ngakho-ke, lokhu kucabanga akuvumelekile. UPourchez nabanye nabo bayangabaza le mbono. Eqinisweni, isikhathi sokufuduka noma sokufuduka kwe-ion sifushane kakhulu, ngokusobala asifani nokubambezeleka kwe-hydration yesamente.
2. Ukuwohloka kwe-alkaline
Ama-polysaccharides aphela kalula ngaphansi kwezimo ze-alkaline ukuze akhiqize ama-hydroxyl carboxylic acids aphuza ukumuncwa kwe-samente. Ngakho-ke, ukumuncwa kwe-hydroxypropyl methyl cellulose okubambezelekile kungenzeka ngenxa yokuwohloka kwayo kuma-slurries esimende se-alkaline ukuze kwakheke ama-hydroxycarboxylic acids. Kodwa-ke, uPourchez nabanye bathole ukuthi ama-cellulose ethers ayezinzile kakhulu ngaphansi kwezimo ze-alkaline, aphela kancane, futhi imikhiqizo yokuwohloka yayinethonya elincane ekubambezelekeni kokumuncwa kwe-samente.
3, ukumuncwa
Ukumuncwa kungaba yi-hydroxypropyl methyl cellulose block cement hydration isizathu sangempela ukuthi izithasiselo eziningi eziphilayo zizomuncwa ezinhlayiyeni zesimende kanye nemikhiqizo yokumuncwa, zivimbele ukuncibilika kwezinhlayiyeni zesimende kanye nokukristala kwemikhiqizo yokumuncwa, ukuze kubambezeleke ukumuncwa kanye nokujiya kwesimende. UPourchez nabanye bathole ukuthi ama-cellulose ethers amuncwa kalula ezindaweni zemikhiqizo yokumuncwa njenge-calcium hydroxide, i-CSH gel kanye ne-calcium aluminate hydrate, kodwa angamuncwa kalula yi-ettringite kanye nezigaba ezingamuncwanga. Ngaphezu kwalokho, esimweni se-cellulose ether, amandla okumuncwa kwe-HEC anamandla kunokwe-MC yokuvuvukala. Uma okuqukethwe kwe-hydroxyethyl ku-HEC noma i-hydroxypropyl kuphansi ku-I-HPMC, uma amandla okufaka amanzi aqine: ngokuqondene nemikhiqizo yokufutha, amandla okufaka amanzi e-calcium hydroxide aqine kune-CSH. Ukuhlaziywa okwengeziwe kukhombisa nokuthi amandla okufaka amanzi aqine emikhiqizo yokufutha kanye ne-cellulose ether ahlobene nokubambezeleka kokufaka amanzi esimende: uma ukufutha kuqine, ukubambezeleka kusobala kakhulu, kodwa ukufutha i-ettringite ye-cellulose ether kubuthakathaka, kodwa ukwakheka kwayo, kodwa lokhu kubambezeleka kakhulu. I-cellulose ether ye-triccalcium silicate kanye nemikhiqizo yayo yokufutha inokufaka amanzi aqinile, kusobala ukuthi iyalibazisa inqubo yokufutha yesigaba se-silicate, inani lokufutha i-ettringite liphansi kakhulu, kodwa ukwakheka kwe-ettringite okubambezelekile kusobala, ngenxa yokwakheka kwe-ettringite okubambezelekile kuthinteka yi-Ca2 + ibhalansi esixazululweni, kuyisandiso se-cellulose ether. Ukufutha amanzi abambezelekile kwe-silicate kuyaqhubeka.
Lezi yizimiso ze-hydroxypropyl methyl cellulose delay cement hydration. Sithemba ukuthi lolu lwazi luzokwenza wonke umuntu aqonde ukuthi umkhiqizo usebenza kanjani futhi awusebenzise kangcono.
Isikhathi sokuthunyelwe: Ephreli-26-2024