Ekusetyenzisweni kwei-hydroxypropyl methyl cellulose HPMC, sihlala sifumanisa ukuba yahlulwe kabini: ukunyibilika ngokukhawuleza kunye nokunyibilika kancinci. Masiqonde umahluko phakathi kokunyibilika ngokukhawuleza kunye nokunyibilika kancinci kwe-hydroxypropyl methyl cellulose.
I-HPMC ekhawulezileyo ibhekisa ekusetyenzisweni kwe-arhente yokudibanisa ukunyanga umphezulu kwinkqubo yemveliso, ukuze i-HPMC isasazeke ngokukhawuleza emanzini abandayo, kodwa kungabi sisisombululo sokwenyani, ngokuxukuxa okufanayo, i-viscosity inyuka kancinci, oko kukuthi, ukunyibilika;
I-HPMC enyibilikayo kancinci ikwabizwa ngokuba ziimveliso ezinyibilikayo ezishushu. Xa kufikwa emanzini abandayo, anokusasazwa ngokukhawuleza emanzini ashushu. Ngokuxutywa ngokulinganayo, ubushushu besisombululo buya kwehla bufikelele kubushushu obuthile. (Ubushushu bejeli yethu bumalunga nama-60°C), i-viscosity iya kubonakala kancinci de kube yijeli ecacileyo nenamathelayo.
Nantsi umahluko phakathi kwesisombululo esikhawulezileyo nesisombululo esicothayo. Ukuba unemibuzo malunga nolu lwazi, ungaqhagamshelana nathi.
I-Hydroxypropyl methyl celluloseI-HPMCukulibazisa ukufuma kwesamente
Ukongeza i-hydroxypropyl methyl cellulose kwisamente kuyayicothisa i-hydration yayo. Ngoko ke yintoni oyaziyo ngendlela esebenza ngayo? Makhe sijonge i-hydroxypropyl methyl cellulose ukuze kulibazise i-hydration yesamente. Umgaqo.
1. Ingcamango yesifo sokuhamba kwe-ion
Sicinge ukuba i-hydroxypropyl methyl cellulose iya kwandisa i-viscosity yezisombululo ze-pore, ithintele isantya sokuhamba kwe-ionic, kwaye ilibazise i-hydration yesamente. Nangona kunjalo, ii-ethers ze-cellulose ze-viscosity ezisezantsi kolu vavanyo zazinamandla angaphezulu okulibazisa i-hydration yesamente. Ke ngoko, olu qikelelo alusebenzi. UPourchez et al. nabo bayaluthandabuza olu qikelelo. Enyanisweni, ixesha lokufuduka okanye lokufuduka kwe-ion lifutshane kakhulu, ngokucacileyo alifani nokulibazisa i-hydration yesamente.
2. Ukonakala kwe-alkaline
IiPolysaccharides ziwohloka lula phantsi kweemeko ze-alkaline ukuze zivelise ii-hydroxyl carboxylic acids ezilibazisa ukufuma kwesamente. Ke ngoko, ukufuma kwe-hydroxypropyl methyl cellulose okulibazisekileyo kusenokuba kungenxa yokuwa kwayo kwi-alkaline cement slurries ukuze zenze ii-hydroxycarboxylic acids. Nangona kunjalo, uPourchez et al. bafumanise ukuba ii-cellulose ethers zazizinzile kakhulu phantsi kweemeko ze-alkaline, zonakaliswe kancinci, kwaye iimveliso zokubola azinampembelelo ingako ekulibazisekeni kokufuma kwesamente.
3, ukufunxwa
Ukufunxwa kungaba yi-hydroxypropyl methyl cellulose block cement hydration, isizathu sokwenyani kukuba izongezo ezininzi zezinto eziphilayo ziya kufunxwa kwiinxalenye zesamente kunye neemveliso zokufunxwa, zithintele ukunyibilika kweenxalenye zesamente kunye nokukristaleka kweemveliso zokufunxwa, ukuze kulibazise ukufunxwa kunye nokuxinana kwesamente. UPourchez et al. bafumanise ukuba ii-cellulose ethers zifunxwa ngokulula kwiindawo zeemveliso zokufunxwa ezifana ne-calcium hydroxide, i-CSH gel kunye ne-calcium aluminate hydrate, kodwa azifunxwa lula yi-ettringite kunye nezigaba ezingafunxwanga. Ngaphezu koko, kwimeko ye-cellulose ether, amandla okufunxwa kwe-HEC anamandla kunowokudumba kwe-MC. Okukhona umxholo we-hydroxyethyl kwi-HEC okanye kwi-hydroxypropyl uphantsi.I-HPMC, okukhona amandla okufunxa amandla: malunga neemveliso zokufunxa amanzi, amandla okufunxa e-calcium hydroxide anamandla kune-CSH. Uhlalutyo olongezelelweyo lubonisa ukuba amandla okufunxa amanzi kwiimveliso zokufunxa amanzi kunye ne-cellulose ether anxulumene nokulibaziseka kokufunxa amanzi ngesamente: okukhona amandla okufunxa amanzi, kokukhona ukulibaziseka kuyabonakala, kodwa ukufunxa i-ettringite ye-cellulose ether kubuthathaka, kodwa ukwakheka kwayo, kodwa oku kulibaziseka kakhulu. I-cellulose ether ye-triccalcium silicate kunye neemveliso zayo zokufunxa amanzi ine-adsorption enamandla, ngokucacileyo iyalibaziseka inkqubo yokufunxa amanzi yesigaba se-silicate, ubungakanani bokufunxa amanzi e-ettringite buphantsi kakhulu, kodwa ukwakheka kwe-ettringite okulibazisekayo kuyabonakala, ngenxa yokulibaziseka kokufunxa amanzi e-ettringite kuchatshazelwa yi-Ca2 + balance kwisisombululo, lulwandiso lwe-cellulose ether. Ukufunxa amanzi e-silicate emva kwexesha kuyaqhubeka.
Le yimigaqo ye-hydroxypropyl methyl cellulose delay cement hydration. Sinethemba lokuba olu lwazi luya kwenza wonke umntu aqonde indlela esebenza ngayo imveliso kwaye ayisebenzise ngcono.
Ixesha leposi: Epreli-26-2024