Umgubo wepolymer ehlakazekayo kunye nezinye izinto ezincamathelayo ezingaphiliyo (ezifana nesamente, ikalika etyibilikayo, igypsum, udongwe, njl.njl.) kunye neentlobo ngeentlobo zee-aggregates, izihluzi kunye nezinye izongezo [ezifana ne-hydroxypropyl methylcellulose, i-polysaccharide (isitatshi ether), i-fiber Fiber, njl. ixutywe ukwenza udaka oluxutywe owomileyo. Xa udaka olomileyo lomgubo longezwa emanzini kwaye luxutywe, phantsi kwesenzo se-hydrophilic yokukhusela i-colloid kunye ne-mechanical force shearing, i-latex powder particles inokusasazwa ngokukhawuleza emanzini, okwaneleyo ukwenza ifilimu ye-latex ephindwe kabini. Ukuqulunqwa komgubo werabha kuhluke, okunempembelelo kwi-rheology yodaka kunye neempawu ezahlukeneyo zokwakha: ukudibanisa kwe-latex powder yamanzi xa ichithwa kwakhona, i-viscosity eyahlukileyo ye-latex powder emva kokusasazeka, umphumo Isiqulatho somoya wodaka kunye nokusasazwa kwamaqamu, Ukusebenzisana phakathi komgubo werabha kunye nezinye izongezo kwenza umgubo welatex owahlukileyo ube nemisebenzi yokunyusa ulwelo, ukwandisa ithixotropy, kunye nokwanda. i-viscosity.
Ngokuqhelekileyo kukholelwa ukuba indlela apho i-latex powder iphinda iphinde iphuculwe iphucula ukusebenza kodaka olutsha kukuba i-latex powder, ngakumbi i-colloid ekhuselayo, inobudlelwane namanzi xa ichithwa, eyandisa i-viscosity ye-slurry kwaye iphucula ukuhlangana kwe-slurry. udaka lokwakha.
Emva kokuba udaka olutsha oluqulathe i-latex powder dispersion lwenziwe, ngokufunxwa kwamanzi kwindawo esezantsi, ukusetyenziswa kwe-hydration reaction, kunye nokusasazeka emoyeni, amanzi ayancipha ngokuthe ngcembe, amasuntswana e-resin asondela ngokuthe ngcembe, ujongano ngokuthe ngcembe luba lufifi. , kwaye i-resin idibanisa ngokuthe ngcembe enye kwenye. ekugqibeleni ipholymerized ibe 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 ephuphuma, ukuhamba kwamasuntswana ngokwendalo kuthintelwe ngakumbi kwaye kuthintelwe ngakumbi, kwaye ukuxinezeleka kobuso phakathi kwamanzi nomoya kubangela ukuba zihambelane ngokuthe ngcembe. Kwinqanaba lesibini, xa amasuntswana eqala ukudibana, amanzi kuthungelwano aphuphuma ngumphunga nge-capillary, kunye noxinzelelo oluphezulu lwe-capillary olusetyenziswa kumphezulu wamasuntswana abangela ukuguqulwa kwe-latex spheres ukubenza bahlangane, kwaye amanzi asele azalise iipores, kwaye ifilimu yenziwe ngokufanelekileyo. Inqanaba lesithathu nelokugqibela lenza ukuba ukusasazwa (ngamanye amaxesha kubizwe ngokuba yi-self-adhesion) yeemolekyuli zepolymer ukwenza ifilimu eqhubekayo ngokwenene. Ngexesha lokwenziwa kwefilimu, amasuntswana e-latex ahamba yedwa adityaniswa abe sisigaba esitsha sefilimu ebhityileyo enoxinzelelo oluphezulu. Ngokucacileyo, ukwenzela ukuba i-polymer powder ehlakazekayo ikwazi ukwenza ifilimu kumdaka owenziwe lukhuni, iqondo lokushisa elincinci lokubumba ifilimu (MFT) kufuneka liqinisekiswe ukuba lingaphantsi kweqondo lokushisa lokunyanga lodaka.
I-Colloids - i-polyvinyl alcohol kufuneka ihlulwe kwi-polymer membrane system. Oku akuyongxaki kwinkqubo yodaka lwesamente yealkaline, kuba i-alkali ye-polyvinyl utywala iya kuhlanjululwa yi-alkali eveliswa yi-cement hydration, kwaye i-adsorption ye-quartz material iya kwahlula ngokuthe ngcembe i-polyvinyl alcohol kwisistim, ngaphandle kwe-hydrophilic protective colloid. . , Ifilimu eyenziwe ngokusasaza i-latex powder edibeneyo, engaxutywanga emanzini, ayikwazi ukusebenza kuphela kwiimeko ezomileyo, kodwa nakwiimeko zokucwiliswa kwamanzi ixesha elide. Kakade ke, kwiinkqubo non-alkaline, ezifana gypsum okanye iinkqubo zokuzalisa kuphela, ekubeni utywala polyvinyl kusekho inxalenye yokugqibela ifilimu polymer, nto leyo echaphazela ukumelana kwamanzi ifilimu, xa ezi nkqubo zingasetyenziswanga amanzi ixesha elide. ukuntywiliselwa, kunye nepolymer isenazo iimpawu zayo mechanical, dispersible ipolymer powder isenokusetyenziswa kwezi nkqubo.
Ngokuqulunqwa kokugqibela kwefilimu ye-polymer, inkqubo equlunqwe yi-inorganic kunye ne-organic binders yenziwa kwi-mortar ephilisiwe, oko kukuthi, i-skeleton e-brittle kunye ne-hard skeleton eyakhiwe ngezinto ze-hydraulic, kunye ne-polymer powder edibeneyo yenziwa kwi-gap kunye nomhlaba oqinileyo. inethiwekhi ebhetyebhetye. Amandla okuqina kunye nokubambisana kwefilimu ye-polymer resin eyenziwe ngumgubo we-latex iphuculwe. Ngenxa yokuguquguquka kwepolymer, umthamo we-deformation uphezulu kakhulu kunesakhiwo esiqinileyo selitye le-samente, ukusebenza kwe-deformation yodaka kuphuculwe, kwaye umphumo wokusabalalisa uxinzelelo uphuculwe kakhulu, ngaloo ndlela kuphuculwe ukuxhathisa kokuqhekeka kodaka. .
Ngokunyuka komxholo wepolymer powder echithwayo, yonke inkqubo iphuhlisa ukuya kwiplastiki. Kwimeko yomxholo ophezulu we-latex powder, isigaba se-polymer kudaka olunyangisiweyo ngokuthe ngcembe ludlula isigaba semveliso ye-inorganic hydration, udaka luya kutshintsha umgangatho kwaye lube yi-elastomer, kwaye imveliso ye-hydration yesamente iya kuba "isigcwalisi" ". Amandla anqabileyo, u-elasticity, ukuguquguquka kunye nokutywinwa kweempawu zodaka olutshintshiweyo kunye ne-disperible polymer powder zaphuculwa. Ukufakwa kweepolymer powders ezihlakazekayo kuvumela ifilimu ye-polymer (ifilimu ye-latex) ukuba yenze kwaye ibe yinxalenye yeendonga ze-pore, ngaloo ndlela itywine isakhiwo esinobugorha esiphezulu sodaka. I-latex inwebu inomatshini wokuzolula osebenza ngoxinzelelo kwi-anchorage yayo ngodaka. Ngala mandla angaphakathi, i-mortar ibanjwe ngokubanzi, ngaloo ndlela ikhulisa amandla adibeneyo odaka. Ubukho beepolymers eziguquguqukayo kakhulu kwaye zinwebeka kakhulu ziphucula ukuguquguquka kunye nokuqina kodaka. Indlela yokunyuka kwengcinezelo yesivuno kunye namandla angaphumeleli ngolu hlobo lulandelayo: xa kusetyenziswe amandla, i-microcracks ilibazisekile ngenxa yokuphucula ukuguquguquka kunye nokuqina, kwaye musa ukwenza de kube kufikeleleke uxinzelelo oluphezulu. Ukongeza, imimandla ephothiweyo yepolymer ikwathintela ukudityaniswa kwee-microcracks zibe ziintanda. Ke ngoko, i-polymer powder ehlakazekayo yonyusa uxinzelelo lokungaphumeleli kunye nokungaphumeleli koxinzelelo lwezinto.
Ifilimu ye-polymer kwi-polymer-modified mortar inefuthe elibaluleke kakhulu ekuqineni komdaka. I-polymer powder ehlaziywayo isasazwa kwi-interface idlala enye indima ephambili emva kokuba ihlakazekile kwaye yenziwe ifilimu, oko kukwandisa ukunamathela kwizinto zokudibanisa. Kwi-microstructure yendawo yojongano phakathi kwepolymer-modified ceramic tile bonding mortar kunye nethayile ye-ceramic, ifilimu eyenziwe yipolymer yenza ibhulorho phakathi kwetayile ye-ceramic enevitrified kunye nokufunxa kwamanzi aphantsi kakhulu kunye ne-matrix yodaka lwesamente. Ummandla woqhagamshelwano phakathi kwezinto ezimbini ezingafaniyo yindawo ekhethekileyo yomngcipheko ophezulu apho ukuqhekeka kwe-shrinkage kwakheka kwaye kukhokelela ekulahlekeni kokubambelela. Ngoko ke, ukukwazi kweefilimu ze-latex ukuphulukisa ukuqhekeka kwe-shrinkage kudlala indima ebalulekileyo kwi-adhesives tile.
Ngelo xesha, i-polymer powder ehlaziywayo equkethe i-ethylene ine-adhesion evelele ngakumbi kwi-organic substrates, ngokukodwa izinto ezifanayo, ezifana ne-polyvinyl chloride kunye ne-polystyrene. Umzekelo omhle we
Ixesha lokuposa: Oct-31-2022