Ithini indima yogcino lwamanzi oluxutywe kwizinto zomgubo wegypsum?
Impendulo: i-gypsum yokutyabeka, i-gypsum edibeneyo, i-caulking gypsum, i-gypsum putty kunye nezinye izinto zokwakha zomgubo zisetyenziswa.Ukuze kuququzelelwe ukwakhiwa, i-gypsum retarders yongezwa ngexesha lokuvelisa ukwandisa ixesha lokwakhiwa kwe-gypsum slurry.I-retarder yongezwa ukuze inqanda inkqubo ye-hydration ye-hemihydrate gypsum.Olu hlobo lwe-gypsum slurry kufuneka lugcinwe eludongeni iyure enye ukuya kwezi-2 phambi kokuba ijiye, kwaye uninzi lweendonga zineempawu zokufunxa amanzi, ngakumbi iindonga zezitena, kunye neendonga ezinomoya, iibhodi zokugquma kunye nezinye ezinobunzima obutsha. izixhobo zodonga, ngoko i-gypsum slurry kufuneka igcinwe ngamanzi ukukhusela inxalenye yamanzi kwi-slurry ekugqithiseni eludongeni, okubangela ukunqongophala kwamanzi xa i-gypsum slurry ilukhuni kunye nokungonelanga kwe-hydration.Ngokupheleleyo, kubangela ukuhlukana kunye ne-shelling yokudibanisa phakathi kwe-plaster kunye nodonga oluphezulu.Ukongezwa kwe-arhente yokugcina amanzi kukugcina umswakama oqulethwe kwi-gypsum slurry, ukuqinisekisa ukuphendulwa kwe-hydration ye-gypsum slurry kwi-interface, ukwenzela ukuba kuqinisekiswe amandla okudibanisa.Ii-agents ezisetyenziswa ngokuqhelekileyo zokugcina amanzi ziyi-cellulose ethers, ezifana ne-methyl cellulose (MC), i-hydroxypropyl methyl cellulose (HPMC), i-hydroxyethyl methyl cellulose (HEMC), njl. umgubo womhlaba onqabileyo, njl.
Kungakhathaliseki ukuba luhlobo luni lwe-ejenti yokugcina amanzi inokulibazisa izinga le-hydration ye-gypsum ukuya kumaqondo ahlukeneyo, xa inani le-retarder lihlala lingatshintshi, i-agent egcina amanzi ingakwazi ukulibazisa ukuseta imizuzu eyi-15-30.Ngoko ke, umthamo we-retarder unokuncitshiswa ngokufanelekileyo.
Yiyiphi idosi efanelekileyo ye-arhente yokugcina amanzi kwi-gypsum powder material?
Impendulo: Iiarhente zokugcina amanzi zihlala zisetyenziswa kwimathiriyeli yomgubo wolwakhiwo efana negypsum yokutyabeka, igypsum ebonding, i-caulking gypsum, kunye negypsum putty.Ngenxa yokuba olu hlobo lwe-gypsum luxutywe kunye ne-retarder, evimbela inkqubo ye-hydration ye-hemihydrate gypsum, kuyimfuneko Ukuqhuba unyango lokugcinwa kwamanzi kwi-slurry ye-gypsum ukukhusela inxalenye yamanzi kwi-slurry ukuba idluliselwe eludongeni, kubangele ukunqongophala kwamanzi kunye ne-hydration engaphelelanga xa i-gypsum slurry ilukhuni.Ukongezwa kwe-arhente yokugcina amanzi kukugcina umswakama oqulethwe kwi-gypsum slurry, ukuqinisekisa ukuphendulwa kwe-hydration ye-gypsum slurry kwi-interface, ukwenzela ukuba kuqinisekiswe amandla okudibanisa.
Idosi yayo ngokuqhelekileyo yi-0.1% ukuya kwi-0.2% (i-accounting ye-gypsum), xa i-gypsum slurry isetyenziswa kwiindonga ezinokufakwa kwamanzi anamandla (afana nekhonkrithi ene-aerated, iibhodi zokugquma i-perlite, iibhloko zegypsum, iindonga zezitena, njl. igypsum, igypsum eyakhiweyo, igypsum etyatyekwayo okanye iputty ebhityileyo yomphezulu, isixa se-arhente egcina amanzi kufuneka sibe sikhulu (ngokukodwa sibe yi-0.2% ukuya kwi-0.5%).
Ii-agent zokugcina amanzi ezifana ne-methyl cellulose (MC) kunye ne-hydroxypropyl methylcellulose (HPMC) zi-soluble ezibandayo, kodwa ziya kwenza amaqhuma kwinqanaba lokuqala xa zichithwa ngokuthe ngqo emanzini.I-arhente yokugcina amanzi kufuneka ixutywe kwangaphambili kunye ne-gypsum powder ukuze isasazeke.Lungisa ube ngumgubo owomileyo;yongeza amanzi kwaye uvuselele, makhe ume imizuzu emi-5, uvuselele kwakhona, umphumo ungcono.Nangona kunjalo, okwangoku kukho iimveliso ze-cellulose ether ezinokuchithwa ngokuthe ngqo emanzini, kodwa zinempembelelo encinci kwimveliso yodaka olumileyo lwepowder.
I-ejenti yokukhusela amanzi idlala njani umsebenzi ongenamanzi kwi-gypsum body hardened?
Impendulo: Iindidi ezahlukeneyo zokukhusela amanzi zenza umsebenzi wazo ongenamanzi kwi-gypsum umzimba onzima ngokweendlela ezahlukeneyo zokwenza.Ngokwesiseko kunokushwankathelwa kwezi ndlela zine zilandelayo:
(1) Nciphisa ukunyibilika kwe-gypsum yomzimba oqinileyo, ukwandisa i-coefficient yokuthambisa, kunye nokuguqula ngokuyinxenye i-calcium sulfate dihydrate kunye nokunyibilika okuphezulu kumzimba oqinileyo kwityuwa ye-calcium ene-solubility ephantsi.Ngokomzekelo, i-saponified synthetic fatty acid equkethe i-C7-C9 yongezwa, kwaye inani elifanelekileyo le-quicklime kunye ne-ammonium borate yongezwa ngexesha elifanayo.
(2) Yenza umaleko wefilimu ongangeni manzi ukuze uthintele i-capillary pores entle kumzimba oqinileyo.Ngokomzekelo, ukudibanisa i-emulsion yeparafini, i-asphalt emulsion, i-emulsion ye-rosin kunye ne-parafini-rosin composite emulsion, ukuphuculwa kwe-asphalt composite emulsion, njl.
(3) Guqula amandla angaphezulu omzimba oqinileyo, ukwenzela ukuba iamolekyu zamanzi zikwimeko edibeneyo kwaye ayikwazi ukungena kwiindlela ze-capillary.Ngokomzekelo, iintlobo ezahlukeneyo zokugxotha amanzi e-silicone zifakwe, kubandakanywa neoli ye-silicone e-emulsified.
(4) Ngokugquma kwangaphandle okanye ukuntywila ukwahlula amanzi ekubhaptizweni kwimizila ye-capillary yomzimba oqinileyo, iintlobo ezahlukeneyo ze-silicone zokukhusela amanzi zingasetyenziswa.I-silicones esekwe kwi-solvent ingcono kune-silicones esekwe emanzini, kodwa yangaphambili yenza ukuba i-gas permeability ye-gypsum lukhuni umzimba wehlile.
Nangona ii-agent ezahlukeneyo zokuthintela amanzi zingasetyenziselwa ukuphucula ukungangeni kwamanzi kwezixhobo zokwakha ze-gypsum ngeendlela ezahlukeneyo, i-gypsum iseyinto yokuqinisa umoya, engafanelekanga kwiindawo ezingaphandle okanye ezihlala ixesha elide ezifumileyo, kwaye zilungele kuphela iindawo ezinokuthi zitshintshe. iimeko ezimanzi nezomileyo.
Yintoni ukuguqulwa kwe-gypsum yokwakha nge-agent yokukhusela amanzi?
Impendulo: Kukho iindlela ezimbini eziphambili zokwenza i-agent ye-gypsum yokukhusela amanzi: enye kukunyusa i-coefficient yokuthambisa ngokunciphisa i-solubility, kwaye enye kukunciphisa izinga lokungena kwamanzi kwizinto ze-gypsum.Kwaye ukunciphisa ukufunxa kwamanzi kunokwenziwa kwimiba emibini.Enye kukunyusa ukuqina kwe-gypsum eqinile, oko kukuthi, ukunciphisa ukunyuswa kwamanzi kwi-gypsum ngokunciphisa i-porosity kunye nokuqhekeka kwesakhiwo, ukwenzela ukuba kuphuculwe ukuxhathisa kwamanzi kwi-gypsum.Enye kukwandisa amandla omhlaba we-gypsum lukhuni, oko kukuthi, ukunciphisa ukufunxa kwamanzi kwi-gypsum ngokwenza umphezulu wepore wenze ifilimu ye-hydrophobic.
Ama-agent okukhusela amanzi anciphisa i-porosity adlala indima ngokuthintela ama-pores amahle e-gypsum kunye nokwandisa ukunyanzeliswa komzimba we-gypsum.Kukho imixube emininzi yokunciphisa i-porosity, njengale: i-emulsion yeparafini, i-asphalt emulsion, i-rosin emulsion kunye ne-parafini asphalt composite emulsion.Ezi zixhobo zokukhusela amanzi zisebenza kakuhle ekunciphiseni i-porosity ye-gypsum phantsi kweendlela ezifanelekileyo zokucwangcisa, kodwa ngelo xesha, nazo zinemiphumo emibi kwiimveliso ze-gypsum.
Eyona nto iqhelekileyo yokugxotha amanzi etshintsha amandla angaphezulu yi-silicone.Inokungena kwi-port ye-pore nganye, itshintshe amandla angaphezulu ngaphakathi koluhlu oluthile lobude, kwaye ngaloo ndlela iguqule i-angle yoqhagamshelwano ngamanzi, yenza iimolekyuli zamanzi zidibanise kunye zenze amaconsi, zithintele ukungena kwamanzi, zifezekise injongo yokuthintela amanzi, kwaye kwangaxeshanye gcina umoya wokungena kwi-plaster.Iindidi zolu hlobo lwe-agent yokukhusela amanzi ngokukodwa zibandakanya: i-sodium methyl siliconate, i-silicone resin, ioli ye-silicone emulsified, njl. Kakade ke, le arhente yokukhusela amanzi ifuna ukuba ububanzi beepores bungabi bukhulu kakhulu, kwaye ngexesha elifanayo alikwazi ukumelana. ukungena kwamanzi oxinzelelo, kwaye ayikwazi ngokusisiseko ukucombulula iingxaki zexesha elide ezingenamanzi kunye nobungqina bomswakama weemveliso zegypsum.
Abaphandi basekhaya basebenzisa indlela yokudibanisa izinto eziphilayo kunye nezinto eziphilayo, oko kukuthi, ngokusekelwe kwi-emulsion ye-organic emulsion yokukhusela amanzi efunyenwe yi-co-emulsification ye-polyvinyl alcohol kunye ne-stearic acid, kunye nokongeza ilitye le-alum, i-naphthalenesulfonate aldehyde condensate Uhlobo olutsha lwe-gypsum composite yokukhusela amanzi. i-agent yenziwe ngokudibanisa i-agent yetyuwa yokukhusela amanzi.I-agent ye-gypsum composite yokukhusela amanzi ingaxutywa ngokuthe ngqo kunye ne-gypsum kunye namanzi, ithathe inxaxheba kwinkqubo ye-crystallization ye-gypsum, kwaye ifumane umphumo ongcono wokukhusela amanzi.
Yintoni umphumo wokuthintela we-silane yokukhusela amanzi kwi-efflorescence kwi-gypsum mortar?
Impendulo: (1) Ukongezwa kwe-agent ye-silane yokukhusela amanzi kunokunciphisa kakhulu iqondo le-efflorescence ye-gypsum mortar, kunye neqondo lokunqanda i-efflorescence inhibition ye-gypsum mortar inyuka ngokunyuka kwe-silane yokudibanisa phakathi koluhlu oluthile.Impembelelo yokuthintela i-silane kwi-0.4% ye-silane ifanelekile, kwaye umphumo wayo wokuthintela udla ngokuzinza xa isixa sidlula le mali.
(2) Ukongezwa kwe-silane akugcini nje ukwenza i-hydrophobic layer phezu komhlaba wodaka ukukhusela ukungena kwamanzi angaphandle, kodwa kunciphisa ukufuduka kwe-lye yangaphakathi ukuze yenze i-efflorescence, ephucula kakhulu isiphumo sokuthintela i-efflorescence.
(3) Ngelixa ukongezwa kwe-silane kuthintela ngokubonakalayo i-efflorescence, ayinasiphumo esibi kwiimpawu zoomatshini zemveliso ye-gypsum mortar, kwaye ayichaphazeli ukwakheka kolwakhiwo lwangaphakathi kunye nomthamo wokugqibela wemveliso ye-gypsum eyomileyo. -xuba izinto zokwakha .
Ixesha lokuposa: Nov-22-2022