Kwakamsinya nje ukuba izinto ezisekelwe kwisamente zongezwe nge-latex powder zidibana namanzi, i-hydration reaction iyaqala, kwaye isisombululo se-calcium hydroxide sifikelela ngokukhawuleza ekugcwaleni kwaye iikristale ziyaqina, kwaye kwangaxeshanye, iikristale ze-ettringite kunye neegels ze-calcium silicate hydrate ziyakhiwa. Amasuntswana aqinileyo afakwa kwi-gel kunye namasuntswana esamente angamanzi. Njengoko i-hydration reaction iqhubeka, iimveliso ze-hydration ziyanda, kwaye amasuntswana e-polymer aqokelelana kancinci kancinci kwi-capillary pores, enza umaleko oxineneyo kumphezulu we-gel nakwi-scentles zesamente ezingamanzi.
Amasuntswana epolymer ahlanganisiweyo azalisa kancinci kancinci iipores, kodwa angafikeleli ngokupheleleyo kumphezulu wangaphakathi weepores. Njengoko amanzi encitshiswa ngakumbi kukufuma okanye ukomisa, amasuntswana epolymer apakishwe ngokusondeleyo kwijeli nakwiipores ayahlangana abe yifilimu eqhubekayo, enze umxube odibanisayo kunye ne-hydrated cement paste kunye nokuphucula ukufuma. Ukubopha kweemveliso kunye nee-aggregates. Ngenxa yokuba iimveliso zokufuma ezineepolymers zenza umaleko wokugquma kwindawo yokuhlangana, kunokuchaphazela ukukhula kwe-ettringite kunye neekristale ze-calcium hydroxide ezirhabaxa; kwaye ngenxa yokuba iipolymers zidityaniswe zibe ziifilimu kwiindawo zokutshintsha kwe-interface, izinto ezisekwe kwisamente yepolymer Indawo yokutshintsha ixinene ngakumbi. Amaqela asebenzayo kwezinye iimolekyuli zepolymer aya kuvelisa ii-cross-linking reactions kunye ne-Ca2+ kunye ne-A13+ kwiimveliso zokufuma zesamente ukwenza iibhondi ezikhethekileyo zebridge, ukuphucula ulwakhiwo lwezinto ezisekwe kwisamente eqinileyo, ukunciphisa uxinzelelo lwangaphakathi, kunye nokunciphisa ukuveliswa kwee-microcracks. Njengoko ulwakhiwo lwejeli yesamente lukhula, amanzi ayasetyenziswa kwaye amasuntswana epolymer ahlala kancinci kancinci kwiipores. Njengoko isamente iqhubeka nokuba namanzi, ukufuma kwimingxunya ye-capillary kunciphisa, kwaye amasuntswana e-polymer ahlangana phezu komphezulu wejeli yemveliso ye-hydration yesamente/umxube wesuntswana yesamente engafakwanga amanzi kunye ne-aggregate, ngaloo ndlela kwakheka umaleko ohlala uvaliwe onemingxuma emikhulu Ezaliswe ngamasuntswana e-polymer anamathelayo okanye azincamathelayo.
Indima yomgubo welatex ophinda udibane kwi-mortar ilawulwa ziinkqubo ezimbini zokufunxwa kwesamente kunye nokwakheka kwefilimu yepolymer. Ukwakheka kwenkqubo edibeneyo yokufunxwa kwesamente kunye nokwakheka kwefilimu yepolymer kugqitywa ngamanyathelo ama-4:
(1) Emva kokuba umgubo welatex ophinda uchitheke uxutywe nodaka lwesamente, usasazwa ngokulinganayo kwinkqubo;
(2) Amasuntswana epolymer abekwa phezu komphezulu wejeli yemveliso yesamente yokufunxa amanzi/umxube wamasuntswana esamente angafakwanga amanzi;
(3) Amasuntswana epolymer enza umaleko oqhubekayo nodibeneyo;
(4) Ngexesha lenkqubo yokufunxa isamente, amasuntswana epolymer ahlanganiswe ngokusondeleyo ahlangana abe yifilimu eqhubekayo, edibanisa iimveliso zokufunxa kunye ukwenza ulwakhiwo olupheleleyo lwenethiwekhi.
I-emulsion esasazekileyo yomgubo we-latex ophinda uqhekeke inokwenza ifilimu eqhubekayo enganyibiliki emanzini (umzimba wenethiwekhi ye-polymer) emva kokomiswa, kwaye lo mzimba wenethiwekhi ye-polymer ye-modulus ephantsi elastic unokuphucula ukusebenza kwesamente; kwangaxeshanye, kwimolekyuli ye-polymer. Amaqela athile e-polar kwisamente asabela ngokweekhemikhali kunye neemveliso ze-samente hydration ukwenza iibhulorho ezikhethekileyo, ukuphucula ulwakhiwo lomzimba lweemveliso ze-samente hydration, kunye nokunciphisa nokunciphisa ukuveliswa kwemifantu. Emva kokuba kongezwe umgubo we-latex ophinda uqhekeke, izinga lokuqala le-hydration yesamente liyehla, kwaye ifilimu ye-polymer inokusonga inxenye okanye ngokupheleleyo amasuntswana esamente, ukuze isamente ikwazi ukufuma ngokupheleleyo kwaye iipropati zayo ezahlukeneyo ziphuculwe.
Umgubo welatex ophinda udityaniswe udlala indima ebalulekileyo njengesithako kwi-mortar yokwakha. Ukongeza umgubo welatex ophinda udityaniswe kwi-mortar kunokulungiselela iimveliso ezahlukeneyo ze-mortar ezifana ne-tile adhesive, i-thermal insulation mortar, i-self-leveling mortar, i-putty, i-plastering mortar, i-decoration mortar, i-jointing agent, i-repair mortar kunye nezinto zokuvala ezingangeni manzi, njl. Ububanzi bokusetyenziswa kunye nokusebenza kwe-mortar yokwakha. Kakade ke, kukho iingxaki zokuziqhelanisa phakathi kwe-redispersing latex powder kunye nesamente, i-admixtures kunye ne-admixtures, ekufuneka zinikwe ingqwalasela eyaneleyo kwizicelo ezithile.
Ixesha lokuthumela: Matshi-14-2023