ukwazisa
IHydroxypropyl methylcellulose (HPMC) yi-ether ye-cellulose esetyenziswa kakhulu kumashishini ahlukeneyo afana nokutya, amayeza, kunye nolwakhiwo njenge-thickener, emulsifier, kunye ne-stabilizer. Kushishino lokwakha, i-HPMC isoloko isetyenziswa njengesongezo kwimathiriyeli esekwe kwisamente ukuphumeza iipropati ezinqwenelekayo ezifana nokusebenza, ukugcinwa kwamanzi kunye nokuqina. Uphononongo lufumene ukuba ukongeza i-HPMC kwizinto ezisekwe kwisamente kulibazisa inkqubo yokufakwa kwamanzi kwisamente, ekugqibeleni ichaphazele uphuhliso lwamandla ezinto ezisekwe kwisamente.
Isiphumo se-HPMC kwi-cement hydration
I-cement hydration yi-chemical reaction eyinkimbinkimbi ebandakanya ukusabela kwamanzi ngamaqhekeza e-samente eyomileyo. Ngethuba lenkqubo ye-hydration, iinqununu ze-samente zisabela ngamanzi ukuze zenze iimveliso ezahlukeneyo ze-hydration, ezinceda ukuphucula amandla ezinto ezisekelwe kwi-samente. Uphononongo lufumene ukuba ukongezwa kwe-HPMC kwizinto ezisekwe kwisamente kunokulibazisa ukuhanjiswa kwesamente, ngaloo ndlela kutshintshe izinga kunye nobungakanani bophuhliso lwamandla.
Esinye sezizathu eziphambili zokulibaziseka kokufakwa kwesamente ngamanzi kukugcina amanzi kwi-HPMC. I-HPMC yipolymer ye-hydrophilic efunxa amanzi kunye nokudumba ukwenza i-gel-like structure. Xa i-HPMC yongezwa kwizinto ezisekelwe kwisamente, ifunxa amanzi kumxube, ngaloo ndlela inciphisa amanzi asimahla afunekayo ukugalela amanzi kwisamente. Oku kuthoba isantya senkqubo yokufakwa kwamanzi, njengoko ukusabela kwesamente ngamanzi kufuna unikezelo lwamanzi olwaneleyo.
Enye into ebangela ukulibaziseka kwe-cement hydration yi-adsorption ye-HPMC phezu kwamaqhekeza e-samente. I-HPMC inobudlelwane obuphezulu bamasuntswana esamente ngenxa ye-polarity yayo. Iyakwazi ukubhengezwa kumphezulu weengqungquthela zesamente kwaye yenze umqobo womzimba ukunciphisa umnxibelelwano phakathi kweeamolekyu zamanzi kunye neengqungquthela zesamente. Oku ke kuthoba isantya sokusabela kwesamente ngamanzi, okukhokelela ekulibazisekeni kwesamente ukugalela amanzi.
Ukongezwa kwe-HPMC kwizinto ezisekelwe kwi-samente kuya kuchaphazela inkqubo ye-nucleation kunye ne-crystal yokukhula kweemveliso ze-hydration. I-Hydration ye-samente ibandakanya ukubunjwa kwezigaba ezahlukeneyo ze-crystalline, ezifana ne-calcium silicate hydrate (CSH) kunye ne-calcium hydroxide (CH). I-HPMC inokuthintela i-nucleation kunye nokukhula kwekristale kwezinye zezi zigaba, ukucotha ngakumbi ukuhanjiswa kwesamente.
Indlela yokulibaziseka kwe-samente hydration
Eyona ndlela iphambili apho i-HPMC ilibazisa ukuhanjiswa kwesamente kukwenziwa komqobo womzimba phakathi kwamasuntswana esamente namanzi. Xa i-HPMC isasazwe emanzini, yenza i-gel-efana ne-matrix enokuthi ifake amaqhekeza e-samente kwaye inciphise ukufumaneka kwamanzi asimahla kwi-samente hydration. Oku kunciphisa ukusabela kwesamente ngamanzi, okubangela ukulibaziseka kuphuhliso lwamandla ezinto ezisekelwe kwisamente.
Enye indlela kukufakwa kweHPMC kumphezulu wamasuntswana esamente. I-HPMC inobudlelwane obuphezulu bamasuntswana esamente ngenxa ye-polarity yayo. Iyakwazi ukubhengezwa kumphezulu weengqungquthela zesamente kwaye yenze umqobo womzimba ukunciphisa umnxibelelwano phakathi kweeamolekyu zamanzi kunye neengqungquthela zesamente. Oku kuthoba ngakumbi ukusabela kwesamente ngamanzi.
I-HPMC inokunxibelelana namacandelo ahlukeneyo esamente, njenge-calcium ion, ngaloo ndlela ichaphazela inkqubo ye-nucleation kunye nekristale yokukhula kweemveliso ze-hydration. I-HPMC inokuthintela i-nucleation kunye nokukhula kwekristale kwezinye zezi zigaba, ukucotha ngakumbi ukuhanjiswa kwesamente.
ukuququmbela
Ukongezwa kwe-HPMC kwizixhobo zesamente kunokulibazisa ukuhanjiswa kwesamente, ngaloo ndlela kutshintshe izinga kunye nobungakanani bophuhliso lwamandla. Indlela yokulibaziseka kwe-cement hydration ibangelwa ikakhulu ekubunjweni kwesithintelo somzimba phakathi kweengqungquthela ze-samente kunye namanzi, ekhangiswa phezu kweengqungquthela ze-samente kwaye inqanda inkqubo yokukhula kwe-nucleation kunye ne-crystal yeemveliso ze-hydration. Ukuqonda iindlela apho i-HPMC ibambezela ukuhanjiswa kwesamente kunokusivumela ukuba songezelele ukusetyenziswa kwe-HPMC kwizinto zesamente ukuze sifumane iipropati ezinqwenelekayo ngelixa sigcina uphuhliso lwamandla ezinto zesamente.
Ixesha lokuposa: Oct-24-2023