Udaka oluxubeneyo olomileyo lwenziwa ngokuxuba ngokwasemzimbeni umgubo we-latex odispersible kunye nezinye izinto ezincamathelayo ezingaphiliyo kunye neeaggregates ezahlukeneyo, izigcwalisi kunye nezinye izongezo.Xa udaka olomileyo lwepowder lufakwe emanzini kwaye luxutywe, phantsi kwesenzo se-hydrophilic ekhuselayo ye-colloid kunye ne-mechanical shear force, i-latex powder particles inokusasazwa ngokukhawuleza emanzini, okwaneleyo ukwenza ngokupheleleyo i-latex powder edispersible ibe ngumgubo. ifilimu.
Ukubunjwa kwe-latex powder kuhluke, okuya kuchaphazela i-rheology kunye neempawu ezahlukeneyo zokwakha zodaka.Ukuhambelana kwe-latex powder emanzini xa iphinde yachithwa, i-viscosities eyahlukeneyo ye-latex powder emva kokusasazeka, impembelelo kumxholo womoya wodaka kunye nokusabalalisa amaqamza omoya, intsebenziswano phakathi kwe-latex powder kunye nezinye izongezo, njl. I-latex powders inyuse ukumanzi., Ukwandisa i-thixotropy, ukwandisa i-viscosity kunye nokunye.
Emva kokuba udaka olutsha oluxubeneyo oluqulethe i-latex powder dispersion yenziwe, kunye nokufunxwa kwamanzi ngumgangatho wesiseko, ukusetyenziswa kwe-hydration reaction, kunye nokunyuka emoyeni, amanzi aya kuncipha ngokuthe ngcembe, amasuntswana aya kusondela ngokuthe ngcembe, ujongano kancane kancane ufiphalisa, kwaye ngokuthe ngcembe udibanisa enye kwenye, kwaye ekugqibeleni uhlanganise ukwenza ifilimu.Inkqubo yokwenziwa kwefilimu ye-polymer ihlukaniswe ngamanqanaba amathathu.
Kwinqanaba lokuqala, iinqununu ze-polymer zihamba ngokukhululekile ngendlela ye-Brownian motion kwi-emulsion yokuqala.Njengoko amanzi ephuma ngumphunga, ukuhamba kwamasuntswana ngokwendalo kuthintelwe ngakumbi nangakumbi, kwaye ukuxinana kobuso phakathi kwamanzi nomoya kuyawanyanzela ukuba alungelelanise ngokuthe ngcembe.
Kwinqanaba lesibini, xa amasuntswana adibana omnye nomnye, amanzi akuthungelwano aphuphuma ngomphunga ngeetyhubhu zecapillary, kwaye uxinzelelo oluphezulu lwecapillary lusetyenziswa kumphezulu wamasuntswana lubangela ukuguqulwa kweengqumba zelatex ukuba zidibanise, kwaye amanzi asele azalise iipores, kwaye ifilimu yenziwe ngokufanelekileyo.
Inqanaba lesithathu, lokugqibela lenza ukuba ukusasazwa kweemolekyuli zepolymer zibe yifilimu eqhubekayo.Ngexesha lokwenziwa kwefilimu, amasuntswana e-latex ahlala eyedwa ayadityaniswa abe sisigaba esitsha sefilimu enoxinzelelo oluphezulu.Ngokucacileyo, ukwenzela ukuba i-latex powder ikwazi ukuphinda ikwazi ukwenza ifilimu kwi-mortar lukhuni, kuyimfuneko ukuqinisekisa ukuba iqondo lokushisa elincinci lokubumba ifilimu lingaphantsi kweqondo lokushisa lokunyanga lodaka..
Ngokuqhelekileyo kukholelwa ukuba i-latex powder ehlaziywayo iphucula ukusebenza kodaka olutsha: i-latex powder, ngokukodwa i-colloid ekhuselayo, inobudlelwane bamanzi kwaye yandisa i-viscosity ye-slurry kwaye iphucula ukuhambelana kodaka lokwakha.Kumda, kukuphucula i-brittleness, imodyuli ephezulu e-elastiki kunye nobunye ubuthathaka bodaka lwesamente lwemveli, kunye nokunika udaka lwesamente ngokuguquguquka okungcono kunye namandla okuqina kwebhondi, ukwenzela ukuxhathisa kunye nokulibazisa ukuveliswa kweentanda zodaka lwesamente.Ekubeni i-polymer kunye nodaka lwenza i-interpenetrating network structure, ifilimu ye-polymer eqhubekayo yenziwa kwiipores, eyomeleza ukudibanisa phakathi kwee-aggregates kunye neebhloko ezinye ii-pores kumdaka, ngoko udaka olulungisiweyo emva kokuqina lungcono kunodaka lwesamente.Kukho uphuculo olukhulu.
Ixesha lokuposa: Mar-20-2023