I-Hydroxypropyl methylcellulose (HPMC), njengenye yezona zinto zisetyenziswa kakhulu kwi-organic polymer kwizixhobo ezisekwe kwisamente, ikakhulu isebenza ukuphucula ukusebenza kakuhle, ukugcinwa kwamanzi, kunye nokunamathela kwesamente okanye ikhonkrithi. Nangona kunjalo, njenge-hydrophilic polymer, i-HPMC ikwachaphazela inkqubo yokufunxa amanzi kunye nolwakhiwo lwesamente ngokwamanqanaba ahlukeneyo, ngaloo ndlela ichaphazela kakhulu iimpawu zezinto eziqinileyo. Uphando olunzulu malunga nendlela esebenza ngayo lunceda ukulawula ngokwesayensi idosi yayo kwizicelo zobunjineli, ukuphucula uzinzo lwenkqubo kunye namandla okugqibela.
1.Eyona mpembelelo ithe ngqo ye-HPMC kwinkqubo yokufunxa isamente ivela kwimpembelelo yayo yokugcina amanzi. Ukufunxa isamente kufuna amanzi aneleyo asimahla, kodwa ngexesha lokulungiselela udaka, ngenxa yezinto ezifana nokufunxa amanzi kunye nokuphuma komphunga kwi-substrate, amanzi anokulahleka ngokukhawuleza, okukhokelela ekufunxeni okungaphelelanga. I-HPMC, ngokwenza isakhiwo senethiwekhi esixineneyo esinemilinganiselo emithathu, yonyusa i-viscosity kunye namandla okugcina amanzi kwi-slurry, igcina amanzi ngaphakathi kwenkqubo kwaye ilibazise ukufuduka kwamanzi asimahla ngaphandle. Le nkqubo ilingana "nokunikezelwa kwamanzi okulibazisekileyo." Ke ngoko, i-HPMC inokucothisa izinga lokufunxa amanzi kwizigaba zokuqala, kodwa iyaqhubeka nokubonelela ngomswakama kwiisuntswana zesamente, ivumela ukufunxa okupheleleyo kwizigaba eziphakathi kunye nezamva, ngaloo ndlela iphucula uxinano lwesakhiwo.
2.Impembelelo ye-HPMC kwindlela esebenza ngayo umphezulu wee-samente ikwalawula inkqubo yokufunxa amanzi. Emva kokudumba, i-HPMC yenza ifilimu encinci, efunxa kancinci kumphezulu wee-samente, ithintela ujongano lokuphendula ngokufunxa amanzi. Ubukho befilimu efunxa amanzi bulibazisa unxibelelwano lokuqala phakathi kweeminerali ezifana ne-C3S kunye ne-C2S kunye namanzi, nto leyo ekhokelela kwixesha elide lokungenisa amanzi kunye nencopho yokufunxa amanzi ebambezelekileyo. Oku kuchaza isizathu sokuba ii-mortars ezine-HPMC zihlala zibonisa amaxesha okubeka ixesha elide. Ngaphezu koko, i-HPMC ene-degrees ephezulu yokutshintsha okanye i-viscosity ephezulu inomthamo oqinileyo wokufunxa amanzi kwaye inempembelelo ebalulekileyo ekufunxeni amanzi.
3.I-HPMC yonyusa i-viscosity yenkqubo, inciphisa ukutyibilika kwe-samente paste kwaye ichaphazela ukufuduka kunye ne-crystallization morphology yeemveliso ze-hydration. I-viscosity ephezulu ithintela indawo yokukhula kwekristale, nto leyo ebangela i-CSH gel kunye ne-Ca(OH)₂ crystals ezintle, nto leyo ekhuthaza ukwakheka kwe-homogenization. Nangona amandla okuqala anokuncipha, amandla esigaba samva ayaphucuka ngenxa ye-hydration epheleleyo kunye ne-capillary porosity enciphileyo.
4.Ngokuphathelele ulwakhiwo lwe-microstructure, ukongezwa kwe-HPMC kubangela ulwakhiwo lwenethiwekhi oluxineneyo lweemveliso zokufunxa amanzi. Inokwenza ukufunxa okubuthathaka ngokomzimba ngejeli ye-CSH, iphucule ukunamathelana phakathi kobuso kunye nokunciphisa ukubola. Ezinye izifundo zibonisa ukuba, ngobungakanani obufanelekileyo, i-HPMC inokuphucula iziphene zesakhiwo kwindawo yotshintsho phakathi kobuso (ITZ), iphucule ukuqina kunye nokumelana nokuqhekeka kwe-mortar.
5.Isiphumo se-HPMC ekumanzisweni kwesamente simacala amabini. Ukongezwa okugqithisileyo kunokulibazisa kakhulu ukumanziswa, okukhokelela ekunciphiseni kakhulu amandla okuqala; ngaxeshanye, ukwanda komxholo wezinto eziphilayo kunokunciphisa ukumelana nobushushu obuphezulu bezinto eziqinisa isamente. Ke ngoko, umthamo kufuneka ulawulwe ngokunengqiqo ngokohlobo lwesamente, uhlobo lwezinto eziqinisa isamente, kunye neemeko zokwakha. Umzekelo, kwizixhobo zokwakha ezinomaleko omncinci ezifana ne-tile adhesive kunye ne-putty powder, ukugcinwa kwamanzi kwe-HPMC kunye nesiphumo sokulibaziseka kwexesha ziluncedo; nangona kunjalo, kwi-mortars zokulungisa ezifuna amandla aphezulu kwangoko, umlinganiselo we-viscosity kunye nowokongeza kufuneka ukhethwe ngononophelo.
6. I-HPMCImpembelelo kwinkqubo yokufunxa isamente ibonakala kakhulu kwiinkalo ezintathu: ukulibazisa ukufunxa kunye nokukhuthaza iimpendulo zesigaba samva ngokugcinwa kwamanzi; ukwandisa ixesha lokungeniswa ngokufunxa; kunye nokutshintsha imo kunye nolwakhiwo lweemveliso zokufunxa ngokunyusa i-viscosity. Ulawulo olufanelekileyo lohlobo kunye nomthamo we-HPMC lunokuphucula ukusebenza kwe-mortar ngelixa kuthintelwa impembelelo egqithisileyo kumandla okuqala, kufezekiswe ulungelelwaniso olufanelekileyo phakathi kokusebenza kakuhle kunye neempawu zoomatshini.
Ixesha leposi: Novemba-17-2025