Indlela yokuphucula ukugcinwa kwamanzi kwi-hydroxypropyl methylcellulose

I-Hydroxypropyl methylcellulose yeyona nto isetyenziswa ngokuqhelekileyo kwi-powder mortar. I-ether ye-cellulose idlala indima ebalulekileyo kwi-powder mortar eyomileyo. Emva kokuba i-cellulose ether kwi-mortar ichithwe, umsebenzi ongaphezulu uqinisekisa ukuba i-cementitious material is Inkqubo isasazwa ngokufanelekileyo, kunye ne-cellulose ether, njenge-colloid ekhuselayo, "isonga" amasuntswana aqinileyo kwaye yenza umaleko wefilimu yokuthambisa ngaphandle kwayo. umphezulu, ukwenza inkqubo yodaka izinzile kwaye iphucule ukuhamba komdaka ngexesha leempawu zenkqubo yokuxuba kunye nokugudiswa kokwakhiwa.

IHydroxypropyl methylcellulose HPMC inokugcinwa kwamanzi okugqwesileyo, okunokuthintela ukufuma kudaka olumanzi ukuba uphume umphunga ngaphambi kwexesha okanye ukufunxwa ngumaleko wesiseko, uqinisekisa ukuba isamente igcwele amanzi ngokupheleleyo, ngaloo ndlela iqinisekisa iipropathi zomatshini zodaka, eziluncedo ngakumbi. ukuya kumaleko amancinci Udaka kunye nesiseko esifunxayo okanye udaka olusetyenziswa phantsi kobushushu obuphezulu kunye neemeko ezomileyo. Isiphumo sokugcinwa kwamanzi se-hydroxypropyl methylcellulose ether sinokutshintsha inkqubo yokwakhiwa kwendabuko kunye nokuphucula inkqubela phambili yokwakha. Ngokomzekelo, ukwakhiwa kwe-plastering kunokuqhutyelwa kwii-substrates ezifunxa amanzi ngaphandle kokumanzisa kwangaphambili.

I-viscosity, i-dosage, ubushushu be-ambient kunye nesakhiwo semolekyuli ye-hydroxypropyl methylcellulose HPMC inempembelelo enkulu ekusebenzeni kwayo kokugcinwa kwamanzi. Phantsi kweemeko ezifanayo, ubukhulu be-viscosity ye-cellulose ether, ngcono ukugcinwa kwamanzi; okukhona idosi iphezulu, kokukhona ugcino lwamanzi lungcono. Ngokuqhelekileyo, umlinganiselo omncinci we-ether ye-cellulose unokuphucula kakhulu ukugcinwa kwamanzi kwidaka. Xa i-dosage ifikelela kwindawo ethile Xa isidanga siphezulu, izinga lokugcinwa kwamanzi landa kancinci; xa ubushushu be-ambient bunyuka, ukugcinwa kwamanzi kwe-cellulose ether ngokuqhelekileyo kuncipha, kodwa ezinye ii-ethers ze-cellulose ezilungisiweyo zikwanokugcinwa kwamanzi okungcono phantsi kweemeko eziphezulu zokushisa; i-cellulose eneqondo eliphantsi lokutshintshwa kwe-Etere igcina amanzi ngcono.

Iqela le-hydroxyl kwi-molecule ye-HPMC kunye ne-athomu ye-oksijini kwi-ether bond iya kudibanisa kunye ne-molecule yamanzi ukwenza i-hydrogen bond, iguqule amanzi akhululekile kumanzi adibeneyo, ngaloo ndlela idlala indima enhle ekugcineni amanzi; iimolekyuli zamanzi kunye neselulosi Ukudibanisa phakathi kwamaketanga e-ether molecular kwenza iimolekyuli zamanzi zingene ngaphakathi kwamatyathanga amakhulu e-cellulose ether kwaye zixhomekeke kwimikhosi eqinile yokubopha, ngaloo ndlela yenze amanzi akhululekile kunye namanzi adibeneyo, okuphucula ukugcinwa kwamanzi odaka; i-cellulose ether iphucula ukugcinwa kwamanzi okuxutywe ngokutsha Iipropati ze-rheological, isakhiwo se-porous network kunye noxinzelelo lwe-osmotic ye-cement paste okanye i-film-forming properties of cellulose ether ithintela ukusasazwa kwamanzi. Nangona kunjalo, ngenxa yokugcinwa kwamanzi okunganelisiyo kwi-ether ye-cellulose yangoku, udaka lunokubambisana okungahambi kakuhle kunye nokusebenza kakubi kolwakhiwo, kwaye udaka luthanda ukuqhekeka, ukukrazula nokuwa emva kokwakhiwa.