Umgubo wepolymer ehlakazekayo kunye nezinye izinto ezincamathelayo ezingaphiliyo (ezifana nesamente, i-lime 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. 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. Ukubunjwa komgubo werabha kwahlukile, okunempembelelo kwi-rheology yodaka kunye neepropati ezahlukeneyo zokwakha: ukuxhamla kwe-latex powder yamanzi xa iphinde yachithwa, i-viscosity eyahlukileyo ye-latex powder emva kokusasazeka, umphumo kumxholo womoya wodaka kunye nokusabalalisa amaqamza, Ukusebenzisana phakathi kwe-rubber powder kunye nezinye izongezo zenza ukuba imisebenzi eyandisiweyo ye-latex ye-latex ibe nokwanda kwe-latex kunye nezinye izongezo. i-viscosity.
Ngokuqhelekileyo kukholelwa ukuba indlela apho umgubo we-latex owenziwe ngokutsha uphucula ukusebenza kodaka olutsha kukuba i-latex powder, ngakumbi i-colloid ekhuselayo, inobudlelwane namanzi xa ichithwa, okwandisa i-viscosity ye-slurry kunye nokuphucula ukuhambelana kodaka lokwakha.
Emva kokuba udaka olutsha oluqulethe i-latex powder dispersion lwenziwe, ngokufunxwa kwamanzi ngumgangatho osisiseko, ukusetyenziswa kwe-hydration reaction, kunye nokunyuka kwe-volatilization emoyeni, amanzi ayancipha ngokuthe ngcembe, amasuntswana e-resin asondela ngokuthe ngcembe, i-interface iyancipha ngokuthe ngcembe, kwaye i-resin idibanisa ngokuthe ngcembe enye kwenye. ekugqibeleni i-polymerized ibe yifilimu. 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 ukunxibelelana omnye komnye, amanzi kuthungelwano aphuphuma kwi-capillary, kwaye uxinzelelo oluphezulu lwe-capillary lusetyenziswa kumphezulu wamasuntswana abangela ukuguqulwa kwe-latex spheres ukubenza badibanise kunye, kwaye amanzi aseleyo azalise i-pores, kwaye ifilimu yenziwe ngokucokisekileyo. 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 sefilimu esibhityileyo esinoxinzelelo oluphezulu. Ngokucacileyo, ukwenzela ukuba i-polymer powder ehlakazekayo ikwazi ukwenza ifilimu kumdaka owenziwe lukhuni, iqondo lokushisa elincinci lokubumba ifilimu (MFT) kufuneka liqinisekiswe ukuba lisezantsi kunokushisa kokunyanga kodaka.
I-Colloids - i-polyvinyl alcohol kufuneka ihlulwe kwi-polymer membrane system. Oku akuyongxaki kwi-alkaline sement mortar system, kuba i-alkali ye-alkali iya kuhlanjululwa yi-alkali eveliswa yi-cement hydration, kwaye i-adsorption ye-quartz material iya kuhlukanisa ngokuthe ngcembe i-polyvinyl alcohol kwi-system, ngaphandle kwe-colloid yokukhusela i-hydrophilic. , Ifilimu eyenziwe ngokusasaza i-latex powder edibeneyo, engaxutywanga emanzini, ayikwazi ukusebenza kuphela kwiimeko ezomileyo, kodwa nakwiimeko zokucwiliswa kwamanzi ixesha elide. Kakade ke, kwiinkqubo ezingezizo zealkaline, ezifana negypsum okanye iisistim ezinezihluzi kuphela, ekubeni utywala bepolyvinyl busekho ngokuyinxenye kwifilimu yepolymer yokugqibela, echaphazela ukuxhathisa kwamanzi kwefilimu, xa ezi nkqubo zingasetyenziswanga ukuntywiliselwa ixesha elide emanzini, kwaye i-polymer isenazo iimpawu zayo zokwenza izinto, i-disperible polymer 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 oluphilisiweyo ngokuthe ngcembe ludlula isigaba semveliso ye-inorganic hydration, i-mortar iya kwenza utshintsho olusemgangathweni kwaye ibe yi-elastomer, kwaye imveliso ye-hydration ye-samente iya kuba "yi-filler" ". ifilimu ye-polymer (ifilimu ye-latex) ukuze yenze kwaye yenze inxalenye yeendonga ze-pore, ngaloo ndlela itywina i-porous structure yodaka I-membrane ye-latex ine-self-stretching mechanism efaka i-tension kwi-anchorage yayo kunye nodaka, udaka lubanjwe ngokubanzi, ngaloo ndlela kwandisa amandla okubambisana kwe-polymer eguquguqukayo. 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 omkhulu apho ukuqhekeka kwe-shrinkage kwakheka kwaye kukhokelela ekulahlekeni kokubambelela. Ngoko ke, ukukwazi kweefilimu ze-latex ukuphilisa 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