Umgubo wepolymer osasazekayo kunye nezinye izinto zokuncamathelisa ezingaphiliyo (ezifana nesamente, ilayimu etyibilikayo, igypsum, udongwe, njl.njl.) kunye nee-aggregates ezahlukeneyo, izizalisi kunye nezinye izongezo [ezifana ne-hydroxypropyl methylcellulose, i-polysaccharide (i-starch ether), i-fiber Fiber, njl.njl.] zixutywa ngokwasemzimbeni ukwenza umdaka oxutyiweyo owomileyo. Xa umdaka womgubo owomileyo wongezwa emanzini kwaye uxutywe, phantsi kwesenzo se-hydrophilic protective colloid kunye namandla okucheba oomatshini, amasuntswana omgubo we-latex anokusasazwa ngokukhawuleza emanzini, okwaneleyo ukwenza umgubo we-latex osasazekayo ucinezele ngokupheleleyo. Ukwakheka komgubo werabha kwahlukile, okunefuthe kwi-rheology yomdaka kunye neempawu ezahlukeneyo zokwakha: ukunamathela komgubo we-latex emanzini xa usasazwa kwakhona, i-viscosity eyahlukileyo yomgubo we-latex emva kokusasazeka, impembelelo kumxholo womoya womdaka kunye nokusasazwa kwamaqamza, Ukusebenzisana phakathi komgubo werabha kunye nezinye izongezo kwenza iipowder ezahlukeneyo ze-latex zibe nemisebenzi yokwandisa ukugeleza, ukwandisa i-thixotropy, kunye nokwandisa i-viscosity.
Ngokwesiqhelo kukholelwa ukuba indlela esebenza ngayo i-latex powder ephinda inyibilike iphucula ukusebenza kwe-mortar entsha kukuba i-latex powder, ingakumbi i-colloid ekhuselayo, inomdla wamanzi xa isasazwa, nto leyo enyusa i-viscosity ye-slurry kwaye iphucule ukuhlangana kwe-mortar yokwakha.
Emva kokuba kwenziwe i-mortar entsha equlethe i-latex powder dispersion, ngokufunxwa kwamanzi ngumphezulu wesiseko, ukusetyenziswa kwe-hydration reaction, kunye ne-volatilization emoyeni, amanzi ayancipha kancinci kancinci, amasuntswana e-resin asondela kancinci kancinci, i-interface iyafiphala kancinci kancinci, kwaye i-resin idibana kancinci kancinci. Ekugqibeleni yenziwe i-polymer ibe yifilimu. Inkqubo yokwenziwa kwefilimu ye-polymer yahlulwe yangamanqanaba amathathu. Kwinqanaba lokuqala, amasuntswana e-polymer ahamba ngokukhululekileyo ngendlela ye-Brownian motion kwi-emulsion yokuqala. Njengoko amanzi ephuma, intshukumo yamasuntswana iyancipha ngokwemvelo, kwaye uxinzelelo oluphakathi kwamanzi nomoya lubangela ukuba ahambelane kancinci kancinci. Kwinqanaba lesibini, xa amasuntswana eqala ukudibana, amanzi kwinethiwekhi ayaphuma nge-capillary, kwaye uxinzelelo oluphezulu lwe-capillary olusetyenziswa kumphezulu wamasuntswana lubangela ukuguqulwa kwama-latex spheres ukuze ahlangane, kwaye amanzi aseleyo azalisa ii-pores, kwaye ifilimu yenziwe kancinci. Inqanaba lesithathu nelokugqibela livumela ukusasazeka (ngamanye amaxesha okubizwa ngokuba yi-self-adhesion) kwee-molecule ze-polymer ukwenza ifilimu eqhubekayo ngokwenene. Ngexesha lokwenziwa kwefilimu, amasuntswana e-latex ahambayo ahlukeneyo ahlangana abe yinqanaba elitsha lefilimu ebhityileyo enoxinzelelo oluphezulu lokuxinana. Ngokucacileyo, ukuze umgubo we-polymer osasazekayo ukwazi ukwenza ifilimu kwi-mortar eqinisiweyo, ubushushu obuncinci bokwenza ifilimu (MFT) kufuneka buqinisekiswe ukuba buphantsi kunobushushu bokuphilisa be-mortar.
IiColloids – i-polyvinyl alcohol kufuneka yahlulwe kwinkqubo ye-polymer membrane. Oku akuyongxaki kwinkqubo ye-alkaline cement mortar, kuba i-polyvinyl alcohol iya kuxutywa yi-alkali eveliswa yi-samente hydration, kwaye ukufunxwa kwezinto ze-quartz kuya kwahlula kancinci i-polyvinyl alcohol kwinkqubo, ngaphandle kwe-hydrophilic protective colloid. , Ifilimu eyenziwe ngokusasaza i-redispersible latex powder, enganyibilikiyo emanzini, ayinakusebenza kuphela kwiimeko ezomileyo, kodwa nakwiimeko zokuntywiliselwa emanzini ixesha elide. Kakade ke, kwiinkqubo ezingezizo ze-alkaline, ezifana ne-gypsum okanye iinkqubo ezinezizalisi kuphela, ekubeni i-polyvinyl alcohol isekhona ngokuyinxenye kwifilimu yokugqibela ye-polymer, echaphazela ukumelana kwamanzi kwefilimu, xa ezi nkqubo zingasetyenziswa ukuntywiliselwa emanzini ixesha elide, kwaye i-polymer iseneempawu zayo zoomatshini, i-dispersible polymer powder isengasetyenziswa kwezi nkqubo.
Ngokwenziwa kokugqibela kwefilimu yepolymer, inkqubo eyenziwe ngezinto ezingezizo izinto eziphilayo kunye nezinto eziphilayo yenziwa kwi-mortar ecociweyo, oko kukuthi, i-skeleton ebuthathaka neqinileyo eyenziwe ngezinto ze-hydraulic, kwaye umgubo wepolymer ophinda uqhekeke wenziwa kwinethiwekhi eguquguqukayo yomngxuma kunye nomphezulu oqinileyo. Amandla okuxinana kunye nokuhlangana kwefilimu ye-polymer resin eyenziwe yi-latex powder kuyaphuculwa. Ngenxa yokuguquguquka kwepolymer, amandla okuguqulwa aphezulu kakhulu kunesakhiwo esiqinileyo selitye lesamente, ukusebenza kokuguqulwa kwe-mortar kuyaphucuka, kwaye isiphumo soxinzelelo lokusasazeka siphucuka kakhulu, ngaloo ndlela siphucula ukumelana nokuqhekeka kwe-mortar.
Njengoko umthamo wepowder yepolymer esasazekayo unyuka, yonke inkqubo iphuhliswa iye kwiplastiki. Kwimeko yomxholo ophezulu we-latex powder, isigaba se-polymer kwi-mortar ephilisweyo sidlula kancinci isigaba semveliso ye-hydration ye-inorganic, i-mortar iya kutshintsha umgangatho kwaye ibe yi-elastomer, kwaye imveliso ye-hydration yesamente iya kuba "yi-filler". Amandla okuxinana, ukuthamba, ukuguquguquka kunye neempawu zokutywina ze-mortar eguqulwe nge-polymer powder esasazekayo ziphuculwe. Ukufakwa kwe-polymer powders esasazekayo kuvumela ifilimu ye-polymer (ifilimu ye-latex) ukuba yakhe kwaye ibe yinxalenye yeendonga ze-pore, ngaloo ndlela itywina isakhiwo se-mortar esine-porous kakhulu. I-membrane ye-latex inendlela yokuzolula ngokwayo esebenzisa uxinzelelo kwi-anchorage yayo kunye ne-mortar. Ngala mandla angaphakathi, i-mortar ibanjwa iyonke, ngaloo ndlela yonyusa amandla adibeneyo e-mortar. Ubukho be-polymers eziguquguqukayo kakhulu nezithambileyo kakhulu buphucula ukuguquguquka kunye nokuqina kwe-mortar. Indlela yokwanda koxinzelelo lwemveliso kunye namandla okusilela yile ilandelayo: xa kusetyenziswa amandla, ii-microcracks ziyalibaziseka ngenxa yokuphuculwa kokuguquguquka kunye nokuqina, kwaye azenziwanga de kufikelelwe kwiingcinezelo eziphezulu. Ukongeza, ii-polymer domains ezidibeneyo nazo zithintela ukudibana kwe Ngenxa yoko, umgubo wepolymer osasazekayo wonyusa uxinzelelo lokusilela kunye noxinzelelo lokusilela kwezinto.
Ifilimu yepolymer kwi-mortar eguqulwe yi-polymer inefuthe elibaluleke kakhulu ekuqineni kwe-mortar. Umgubo we-polymer ophinda usasazwe kwi-interface udlala enye indima ebalulekileyo emva kokuba usasazeke kwaye wenziwe ifilimu, oko kukuthi ukwandisa ukunamathela kwizinto ezidibeneyo. Kwisakhiwo se-microstructure sendawo yokudibanisa phakathi kwe-mortar ye-polymer eguqulwe yi-ceramic bonding mortar kunye ne-ceramic tile, ifilimu eyenziwe yi-polymer yenza ibhulorho phakathi kwe-ceramic tile eguqulwe yi-polymer enokufunxwa kwamanzi okuncinci kakhulu kunye ne-cement mortar matrix. Indawo yokunxibelelana phakathi kwezinto ezimbini ezahlukeneyo yindawo ekhethekileyo enomngcipheko ophezulu apho ukuqhekeka kwe-shrinkage kwenzeka khona kwaye kukhokelela ekulahlekelweni kokunamathela. Ke ngoko, amandla eefilimu ze-latex okuphilisa ukuqhekeka kwe-shrinkage adlala indima ebalulekileyo kwi-adhesives ze-tile.
Kwangaxeshanye, umgubo wepolymer ophinda uqhekeke oqulethe i-ethylene unamathele kakhulu kwizinto eziphilayo, ngakumbi izinto ezifanayo, ezifana ne-polyvinyl chloride kunye ne-polystyrene. Umzekelo omhle we
Ixesha lokuthumela: Oktobha-31-2022