Impembelelo yobushushu be-ambient ekusebenzeni kwe-cellulose ether eguquliweyo yegypsum

Ukusebenza kwe-cellulose ether eguqulwayo i-gypsum kumaqondo obushushu ahlukeneyo ahluke kakhulu, kodwa indlela yayo ayicacanga. Iimpembelelo ze-cellulose ether kwiiparameters ze-rheological kunye nokugcinwa kwamanzi kwi-gypsum slurry kumaqondo okushisa ahlukeneyo afundwe. Idayamitha ye-hydrodynamic ye-cellulose ether kwisigaba solwelo ilinganiswe ngendlela eguquguqukayo yokusasaza ukukhanya, kwaye indlela yempembelelo iye yajongwa. Iziphumo zibonisa ukuba i-cellulose ether inefuthe elihle lokugcina amanzi kunye nokuqina kwi-gypsum. Ngokunyuka komxholo we-cellulose ether, i-viscosity ye-slurry iyanda kwaye amandla okugcina amanzi ayanda. Nangona kunjalo, ngokunyuka kweqondo lokushisa, amandla okugcina amanzi e-gypsum slurry eguquliweyo ayancipha ukuya kwinqanaba elithile, kwaye iiparamitha ze-rheological nazo ziyatshintsha. Ukuqwalasela ukuba umbutho we-cellulose ether colloid unokufezekisa ukugcinwa kwamanzi ngokuthintela umjelo wokuthuthwa kwamanzi, ukunyuka kweqondo lokushisa kunokukhokelela ekuqhekekeni kombutho omkhulu owenziwe yi-cellulose ether, ngaloo ndlela ukunciphisa ukugcinwa kwamanzi kunye nokusebenza komsebenzi we-gypsum eguquliweyo.

Amagama angundoqo:igypsum; Iselulosi ether; Ubushushu; Ukugcinwa kwamanzi; irheology

0. Intshayelelo

I-Gypsum, njengoluhlobo lwezinto ezihambelana nokusingqongileyo ezinokwakhiwa kakuhle kunye neempawu ezibonakalayo, zisetyenziswa ngokubanzi kwiiprojekthi zokuhlobisa. Ekusetyenzisweni kwezinto ezisekelwe kwi-gypsum, i-ejenti yokugcina amanzi idla ngokudibaniswa ukuze iguqule i-slurry ukukhusela ukulahleka kwamanzi kwinkqubo yokucoca kunye nokuqina. I-Cellulose ether yeyona arhente ixhaphakileyo yokugcina amanzi okwangoku. Ngenxa yokuba i-ionic CE iya kusabela nge-Ca2 +, ihlala isebenzisa i-non-ionic CE, njenge: hydroxypropyl methyl cellulose ether, i-hydroxyethyl methyl cellulose ether kunye ne-methyl cellulose ether. Kubalulekile ukufunda iipropati ze-cellulose ether eguqulelwe igypsum ukwenzela ukusetyenziswa okungcono kwegypsum kubunjineli bokuhlobisa.

I-ether ye-cellulose yinto ephakamileyo ye-molecular eveliswa yi-reaction ye-alkali cellulose kunye ne-etherifying agent phantsi kweemeko ezithile. I-ether ye-cellulose ye-nonionic esetyenziswa kubunjineli bokwakha inokusasazwa kakuhle, ukugcinwa kwamanzi, ukudibanisa kunye nokuqina. Ukongezwa kwe-cellulose ether kunempembelelo ecacileyo kakhulu kugcino lwamanzi egypsum, kodwa ukugoba kunye namandla acinezelayo e-gypsum lukhuni umzimba nawo wehla kancinci ngokunyuka kwesixa esongezelelweyo. Oku kungenxa yokuba i-cellulose ether inempembelelo ethile yokungenisa umoya, eya kwazisa amaqamza kwinkqubo yokuxuba i-slurry, ngaloo ndlela inciphisa iimpawu zomatshini womzimba onzima. Ngexesha elifanayo, i-ether ye-cellulose eninzi kakhulu iya kwenza umxube we-gypsum unamathele kakhulu, okukhokelela ekusebenzeni kwayo kokwakhiwa.

Inkqubo ye-hydration ye-gypsum inokwahlulwa ibe ngamanyathelo amane: ukuchithwa kwe-calcium sulfate hemihydrate, i-crystallization nucleation ye-calcium sulfate dihydrate, ukukhula kwe-crystalline nucleus kunye nokubunjwa kwe-crystalline structure. Kwinkqubo ye-hydration ye-gypsum, iqela elisebenzayo le-hydrophilic ye-cellulose ether i-adsorbing ebusweni be-gypsum particles iya kulungisa inxalenye yeamolekyu zamanzi, ngaloo ndlela ilibazise inkqubo ye-nucleation ye-gypsum hydration kunye nokwandisa ixesha lokubeka i-gypsum. Ngokujonga kwe-SEM, uMroz wafumanisa ukuba nangona ubukho be-cellulose ether bubambezele ukukhula kweekristale, kodwa kwandisa ukugqithwa kunye nokuhlanganiswa kweekristale.

I-ether ye-Cellulose iqulethe amaqela e-hydrophilic ukwenzela ukuba ibe ne-hydrophilicity ethile, i-polymer chain chain chain idibanisa enye nenye ukuze ibe ne-viscosity ephezulu, ukusebenzisana kwezi zibini kwenza i-cellulose ibe nesiphumo esihle sokugcina amanzi kwi-gypsum mix. UBulichen uchaze indlela yokugcina amanzi e-cellulose ether kwisamente. Ekuxubeni okuphantsi, i-cellulose ether adsorb kwi-samente yokufunxa amanzi e-intramolecular kunye nokuhamba kunye nokuvuvukala ukuphumeza ukugcinwa kwamanzi. Ngeli xesha, ukugcinwa kwamanzi akubikho. I-dosage ephezulu, i-cellulose ether iya kwenza amakhulu e-nanometers kwii-microns ezimbalwa ze-polymer ye-colloidal, ivimbela ngokufanelekileyo inkqubo ye-gel emngxunyeni, ukufezekisa ukugcinwa kwamanzi ngokufanelekileyo. Indlela yokusebenza ye-cellulose ether kwigypsum iyafana naleyo yesamente, kodwa i-SO42-concentration ephezulu kwinqanaba le-fluid ye-gypsum slurry iya kwenza buthathaka umphumo wokugcina amanzi we-cellulose.

Ngokusekwe kulo mxholo ungasentla, kunokufunyaniswa ukuba uphando lwangoku kwi-cellulose ether modified gypsum igxile kakhulu kwinkqubo ye-hydration ye-cellulose ether kumxube we-gypsum, iipropati zokugcina amanzi, iipropati zomatshini kunye ne-microstructure yomzimba olukhuni, kunye ne-mechanism ye-cellulose ether. ukugcinwa kwamanzi. Nangona kunjalo, uphononongo malunga nokusebenzisana phakathi kwe-cellulose ether kunye ne-gypsum slurry kwiqondo lokushisa eliphezulu akwanelanga. Iselulosi ether isisombululo samanzi siya kugalela kwiqondo lobushushu elithile. Njengoko iqondo lokushisa lisanda, i-viscosity ye-cellulose ether isisombululo samanzi siya kuncipha ngokuthe ngcembe. Xa ubushushu be-gelatinization bufikelelwe, i-cellulose ether iya kugalelwa kwijeli emhlophe. Ngokomzekelo, ekwakhiweni kwehlobo, iqondo lokushisa eliphantsi liphezulu, iipropati ze-thermal ze-gel ze-cellulose ether zibophekile ukukhokelela ekutshintsheni kokusebenza kwe-gypsum slurry eguquliweyo. Lo msebenzi uphonononga umphumo wokunyuka kwamaqondo obushushu ekusebenzeni kwe-cellulose ether eguqulelwe kwi-gypsum imathiriyeli ngokusebenzisa imifuniselo ecwangcisiweyo, kwaye inika isikhokelo sokusetyenziswa okusebenzayo kwe-cellulose ether modified gypsum.

1. Linge

1.1 IiMathiriyeli ezikrwada

Igypsum luhlobo lwe-β-uhlobo lwegypsum yokwakha yendalo ebonelelwa yiBeijing Ecological Home Group.

I-ether yeCellulose ekhethiweyo kwiQela le-Shandong Yiteng i-hydroxypropyl methyl cellulose ether, iinkcukacha zemveliso ye-75,000 mPa·s, 100,000 mPa·s kunye ne-200000mPa · s, ubushushu be-gelation ngaphezu kwe-60 ℃. I-Citric acid yakhethwa njenge-gypsum retarder.

1.2 Uvavanyo lweRheology

Isixhobo sovavanyo lwe-rheological esisetyenzisiweyo yi-RST⁃CC rheometer eveliswe yi-BROOKFIELD USA. Iiparamitha ze-Rheological ezifana ne-viscosity yeplastiki kunye nemveliso yoxinzelelo lwe-shear ye-gypsum slurry inqunywe yi-MBT⁃40F⁃0046 isitya sesampuli kunye ne-CC3⁃40 rotor, kwaye idatha iqhutywe yi-software ye-RHE3000.

Iimpawu zomxube we-gypsum zihambelana nokuziphatha kwe-rheological ye-Bingham fluid, edla ngokufundwa kusetyenziswa imodeli yeBingham. Nangona kunjalo, ngenxa ye-pseudoplasticity ye-cellulose ether eyongezwe kwi-polymer-modified gypsum, umxube we-slurry udla ngokubonisa ipropati ethile yokucheba. Kule meko, imodeli ye-Bingham (M⁃B) elungisiweyo inokuchaza ngcono ijika le-rheological yegypsum. Ukuze ufunde ukuchetywa kwegypsum, lo msebenzi ukwasebenzisa imodeli kaHerschel⁃Bulkley (H⁃B).

1.3 Uvavanyo lokugcina amanzi

Inkqubo yovavanyo ibhekisa kwi-GB/T28627⁃2012 Plastering Plastering. Ngexesha lovavanyo lobushushu njengotshintsho, i-gypsum yafudumeza i-1h kwangaphambili kwiqondo lobushushu elihambelanayo kwi-oven, kwaye amanzi axubileyo asetyenzisiweyo kuvavanyo afudunyezwa i-1h kwiqondo lobushushu elihambelanayo kwindawo yokuhlambela amanzi obushushu, kunye nesixhobo esisetyenzisiweyo. yafudumeza kwangaphambili.

1.4 Uvavanyo lwedayamitha ye-Hydrodynamic

Idayamitha ye-hydrodynamic (i-D50) ye-HPMC ye-polymer yombutho kwisigaba solwelo yalinganiswa kusetyenziswa ukukhanya okuguquguqukayo okusasaza ubungakanani be-particle size (Malvern Zetasizer NanoZS90).

2. Iziphumo kunye nengxoxo

2.1 Iipropati zeRheological ze-HPMC eguqulweyo yegypsum

I-viscosity ebonakalayo ngumlinganiselo woxinzelelo lwe-chear ukuya kumlinganiselo wokucheba osebenza kulwelo kwaye yiparameter ebonisa ukuhamba kolwelo olungelulo olwase-Newtonian. I-viscosity ebonakalayo ye-gypsum slurry elungisiweyo itshintshile kunye nomxholo we-cellulose ether phantsi kweenkcazo ezintathu ezahlukeneyo (75000mPa·s, 100,000mpa ·s kunye ne-200000mPa·s). Ubushushu bovavanyo bebungama-20 ℃. Xa izinga lokucheba le-rheometer li-14min-1, kunokufunyaniswa ukuba i-viscosity ye-gypsum slurry iyanda ngokunyuka kokufakwa kwe-HPMC, kwaye i-viscosity ephezulu ye-HPMC, iphezulu i-viscosity ye-gypsum slurry eguquliweyo iya kuba. Oku kubonisa ukuba i-HPMC inokuqina okucacileyo kunye nesiphumo se-viscosification kwi-gypsum slurry. I-Gypsum slurry kunye ne-cellulose ether zizinto ezine-viscosity ethile. Kumxube wegypsum olungisiweyo, i-cellulose ether ibhengezwa kumphezulu weemveliso zegypsum hydration, kwaye inethiwekhi eyenziwe yi-cellulose ether kunye nenethiwekhi eyenziwe ngumxube wegypsum iyadityaniswa, okukhokelela "kwimpembelelo ephezulu", ephucula kakhulu i-viscosity iyonke. imathiriyeli esekwe kwigypsum elungisiweyo.

I-chear ⁃ iigophe zoxinzelelo lwegypsum esulungekileyo (G⁃H) kunye ne-gypsum elungisiweyo (G⁃H) intlama efakwe nge-75000mPa· s-HPMC, njengoko kuqikelelwa kwimodeli ehlaziyiweyo ye-Bingham (M⁃B). Inokufunyanwa ukuba ngokunyuka kwezinga lokucheba, uxinzelelo lwe-shear lomxube luyanda. I-viscosity yeplastiki (ηp) kunye nemveliso yokucheba uxinzelelo (τ0) amaxabiso egypsum esulungekileyo kunye negypsum elungisiweyo ye-HPMC kumaqondo obushushu ahlukeneyo afunyenwe.

Ukusuka kwiplastiki viscosity (ηp) kunye nesivuno sokucheba uxinzelelo (τ0) amaxabiso gypsum esulungekileyo kunye HPMC modified gypsum kumaqondo obushushu ahlukeneyo, kunokubonwa ukuba uxinzelelo isivuno HPMC modified gypsum iya kuncipha ngokuqhubekayo kunye nokwanda ubushushu, kunye nesivuno. Uxinzelelo luyakwehla nge-33% kwi-60 ℃ xa kuthelekiswa ne-20℃. Ngokujonga igophe le-viscosity yeplastiki, kunokufunyanwa ukuba i-viscosity yeplastiki ye-gypsum slurry eguquliweyo nayo iyancipha ngokunyuka kweqondo lokushisa. Nangona kunjalo, uxinzelelo lwesivuno kunye ne-viscosity yeplastiki ye-gypsum slurry ecocekileyo inyuka kancinane ngokunyuka kweqondo lokushisa, ebonisa ukuba utshintsho lweparameters ye-rheological ye-HPMC eguqulelwe kwi-gypsum slurry kwinkqubo yokwanda kweqondo lokushisa kubangelwa utshintsho lweepropati ze-HPMC.

Ixabiso loxinzelelo lwesivuno se-gypsum slurry libonisa ixabiso eliphezulu loxinzelelo lwe-shear xa i-slurry imelana nokuguqulwa kwe-shear. Ixabiso elikhulu loxinzelelo lwesivuno, kokukhona izinzile i-gypsum slurry inokuqina. I-viscosity yeplastiki ibonisa izinga lokuguqulwa kwe-gypsum slurry. Inkulu i-viscosity yeplastiki, ixesha elide lokucheba le-slurry liya kuba. Ukuqukumbela, iiparamitha ezimbini zerheological ze-HPMC eziguqulweyo ze-gypsum slurry ziyancipha ngokucacileyo ngokunyuka kwamaqondo obushushu, kunye nesiphumo sokuqina kwe-HPMC kwi-gypsum slurry sibuthathaka.

Ukuchetywa kodaka kubhekiselele ekuchebeni okujiya okanye ukuchetywa kwesiphumo esibonakaliswa ludaka xa siphantsi konyanzeliso lokucheba. I-shear deformation effect ye-slurry inokugwetywa nge-pseudoplastic index n efunyenwe kwi-curve efanelekileyo. Xa n <1, i-gypsum slurry ibonisa ukuchetywa kwe-shear, kunye ne-shear thinning degree ye-gypsum slurry iba phezulu ngokuhla kwe-n. Xa n > 1, i-gypsum slurry yabonisa ukucheba, kunye neqondo lokucheba le-gypsum slurry linyuke ngokunyuka kwe-n. Rheological curves of HPMC modified gypsum slurry kumaqondo obushushu ahlukeneyo asekelwe kuHerschel⁃Bulkley (H⁃B) imodeli yokulinganisa, ngaloo ndlela ifumana isalathiso sepseudoplastic n ye-HPMC elungisiweyo yegypsum slurry.

Ngokwesalathiso se-pseudoplastic n ye-HPMC eguqulelwe kwi-gypsum slurry, ukuchetywa kwe-slurry ye-gypsum exutywe ne-HPMC kukucheba ukucheba, kwaye ixabiso le-n liyenyuka ngokuthe ngcembe ngokunyuka kwamaqondo obushushu, nto leyo ebonisa ukuba ukuziphatha okuchetywayo kwe-HPMC okuguquliweyo kuya ukuba buthathaka ukusa kumlinganiselo othile xa uchatshazelwa bubushushu.

Ngokusekwe kutshintsho olucacileyo lwe-viscosity ye-gypsum slurry eguquliweyo kunye nesantya sokucheba esibalwe ukusuka kwidatha yoxinzelelo lwe-shear ye-75000 mPa · I-HPMC kumaqondo obushushu ahlukeneyo, kunokufunyanwa ukuba i-viscosity yeplastiki ye-gypsum slurry elungisiweyo iyancipha ngokukhawuleza ngokunyuka kwereyithi yokucheba, eqinisekisa iziphumo ezifanelekileyo zemodeli ye-H⁃B. Udaka lwegypsum olulungisiweyo lubonise iimpawu zokucheba ezibhityileyo. Ngokunyuka kweqondo lokushisa, i-viscosity ebonakalayo yomxube iyancipha ukuya kwinqanaba elithile kwizinga eliphantsi lokucheba, elibonisa ukuba i-shear thinning effect ye-modified gypsum slurry iyancipha.

Kusetyenziso olululo lwe-gypsum putty, uludaka lwegypsum lufuneka ukuba lube lula ukukhubazeka kwinkqubo yokuhlikihla kwaye luhlale luzinzile ekuphumleni, nto leyo efuna i-gypsum slurry ibe neempawu ezintle zokucheba, kunye nokutshintsha kwe-chear yegypsum eguquliweyo ye-HPMC inqabile. umlinganiselo othile, ongenakulungelelaniswa nokwakhiwa kwezinto zegypsum. I-viscosity ye-HPMC yenye yeeparameters ezibalulekileyo, kunye nesizathu esibalulekileyo sokuba idlala indima yokuqina ukuphucula iimpawu eziguquguqukayo zokuhamba kokuxuba. I-cellulose ether ngokwayo ineempawu ze-gel eshushu, i-viscosity yesisombululo sayo samanzi iyancipha ngokuthe ngcembe njengoko iqondo lokushisa likhula, kwaye i-gel emhlophe iyancipha xa ifikelela kwiqondo lokushisa. Utshintsho parameters rheological of cellulose ether gypsum modified kunye lobushushu inxulumene ngokusondeleyo notshintsho viscosity, kuba isiphumo ukutyeba sisiphumo superposition of cellulose ether kunye ludaka oluxubeneyo. Kubunjineli obusebenzayo, impembelelo yobushushu bokusingqongileyo ekusebenzeni kweHPMC kufuneka ithathelwe ingqalelo. Umzekelo, iqondo lobushushu lemathiriyeli ekrwada kufuneka ilawulwe kubushushu obuphezulu ehlotyeni ukunqanda ukusebenza kakubi kwegypsum eguquliweyo ebangelwa bubushushu obuphezulu.

2.2 Ugcino lwamanziIgypsum elungisiweyo ye-HPMC

Ukugcinwa kwamanzi kwi-gypsum slurry ehlengahlengisiweyo kunye neenkcukacha ezintathu ezahlukeneyo ze-cellulose ether zitshintshwa kunye ne-curve yedosi. Ngokunyuka kwedosi ye-HPMC, izinga lokugcinwa kwamanzi kwi-gypsum slurry liphuculwe kakhulu, kwaye ukunyuka kuya kuzinza xa idosi ye-HPMC ifikelela kwi-0.3%. Ekugqibeleni, izinga lokugcinwa kwamanzi kwi-gypsum slurry lizinzile kwi-90% ~ 95%. Oku kubonisa ukuba i-HPMC inesiphumo esicacileyo sokugcina amanzi kwintlama yelitye, kodwa umphumo wokugcina amanzi awuphuculwanga kakhulu njengoko idosi iqhubeka nokunyuka. Iinkcazo ezintathu ze-HPMC zomehluko wezinga lokugcinwa kwamanzi awukho mkhulu, umzekelo, xa umxholo u-0.3%, uluhlu lwezinga lokugcinwa kwamanzi luyi-5%, ukuphambuka okusemgangathweni ngu-2.2. I-HPMC ene-viscosity ephezulu ayilona zinga liphezulu lokugcinwa kwamanzi, kwaye i-HPMC ene-viscosity ephantsi ayilona izinga lokugcinwa kwamanzi liphantsi. Nangona kunjalo, xa kuthelekiswa ne-gypsum ecocekileyo, izinga lokugcinwa kwamanzi kwi-HPMC yesithathu ye-gypsum slurry liphuculwe kakhulu, kwaye izinga lokugcinwa kwamanzi kwi-gypsum eguquliweyo kumxholo we-0.3% lonyuke nge-95%, 106%, 97% xa kuthelekiswa ne iqela lolawulo elingenanto. I-ether ye-cellulose inokuphucula ngokucacileyo ukugcinwa kwamanzi kwi-gypsum slurry. Ngokunyuka komxholo we-HPMC, izinga lokugcinwa kwamanzi kwe-HPMC eguqulweyo ye-gypsum slurry ene-viscosity eyahlukileyo ngokuthe ngcembe ifikelela kwindawo yokuzalisa. I-10000mPa·sHPMC ifikelele kwindawo yokugcwala kwi-0.3%, i-75000mPa·s kunye ne-20000mPa·s HPMC ifikelele kwindawo yokugcwalisa nge-0.2%. Iziphumo zibonisa ukuba ugcino lwamanzi lwe-75000mPa·s HPMC lutshintshile igypsum nobushushu phantsi kwedosi eyahlukileyo. Ngokuhla kweqondo lobushushu, izinga lokugcinwa kwamanzi kwe-HPMC eguquliweyo yegypsum liyehla ngokuthe ngcembe, ngelixa izinga lokugcinwa kwamanzi e-gypsum esulungekileyo lihlala lingatshintshi, libonisa ukuba ukunyuka kwamaqondo obushushu kuyawenza buthathaka amandla okugcina amanzi e-HPMC kwigypsum. Izinga lokugcinwa kwamanzi kwe-HPMC lehle nge-31.5% xa ubushushu bonyuka ukusuka kuma-20 ℃ ukuya kuma-40℃. Xa iqondo lobushushu linyuka ukusuka kwi-40℃ ukuya kuma-60℃, izinga lokugcinwa kwamanzi kwe-HPMC eguquliweyo yegypsum ngokusisiseko liyafana nelo legypsum esulungekileyo, ebonisa ukuba i-HPMC ilahlekelwe sisiphumo sokuphucula ukugcinwa kwamanzi egypsum ngeli xesha. UJian Jian kunye noWang Peiming bacebise ukuba i-ether ye-cellulose ngokwayo ine-gel ye-thermal phenomenon, utshintsho lweqondo lokushisa luya kukhokelela ekutshintsheni kwi-viscosity, i-morphology kunye ne-adsorption ye-cellulose ether, ebophelelwe ukukhokelela kwiinguqu ekusebenzeni komxube we-slurry. UBulichen uphinde wafumanisa ukuba i-viscosity eguquguqukayo yezisombululo zesamente eziqulethe i-HPMC yehle ngokunyuka kobushushu.

Ukutshintshwa kokugcinwa kwamanzi omxube obangelwa ukunyuka kweqondo lokushisa kufuneka kudibaniswe kunye nomatshini we-cellulose ether. UBulichen wachaza indlela apho i-cellulose ether inokugcina amanzi kwisamente. Kwiinkqubo ezisekelwe kwi-samente, i-HPMC iphucula izinga lokugcinwa kwamanzi kwi-slurry ngokunciphisa ukunyanzeliswa kwe "filter cake" eyenziwe yinkqubo ye-cementing. Uxinaniso oluthile lwe-HPMC kwisigaba solwelo luya kwenza amakhulu amaninzi eenanometers ukuya kwii-microns ezimbalwa zombutho we-colloidal, oku kunomthamo othile wesakhiwo sepolymer unokufaka ngempumelelo umjelo wokuhambisa amanzi kumxube, ukunciphisa ukunyanzeliswa "kwekhekhe lokucoca", ukuphumeza ugcino lwamanzi olusebenzayo. UBulichen uphinde wabonisa ukuba i-HPMCS kwi-gypsum ibonisa indlela efanayo. Ngoko ke, isifundo se-hydromechanical diameter yombutho owenziwe yi-HPMC kwisigaba solwelo sinokuchaza umphumo we-HPMC ekugcinweni kwamanzi e-gypsum.

2.3 I-Hydrodynamic diameter ye-HPMC yombutho we-colloid

I-particle yokuhanjiswa kweegophe zoxinaniso olwahlukeneyo lwe-75000mPa·s HPMC kwisigaba solwelo, kunye ne-particle distribution curves yenkcazo ezintathu ze-HPMC kwisigaba solwelo kuxinzelelo lwe-0.6%. Inokubonwa kwigophe lokusasazwa kwamasuntswana e-HPMC yeenkcazo ezintathu kwisigaba solwelo xa ugxininiso luyi-0.6% ukuba, ngokunyuka kwe-HPMC yoxinaniso, ubungakanani be-particle ye-compounds ehambelanayo eyenziwe kwisigaba solwelo nayo iyanda. Xa i-concentration iphantsi, iinqununu ezenziwe yi-HPMC aggregation zincinci, kwaye kuphela inxalenye encinci ye-HPMC edibeneyo ibe ngamaqhekeza malunga ne-100nm. Xa i-HPMC igxininise i-1%, kukho inani elikhulu lemibutho ye-colloidal kunye nobubanzi be-hydrodynamic malunga ne-300nm, oluluphawu olubalulekileyo lwe-molecular overlap. Esi sakhiwo "somthamo omkhulu" we-polymerization sinokuvala ngokufanelekileyo umjelo wokuhambisa amanzi kumxube, ukunciphisa "ukunyamezela kwekhekhe", kunye nokugcinwa kwamanzi okuhambelana nomxube we-gypsum kule ngqwalasela nako kukhulu kune-90%. Iidayamitha ze-hydromechanical ze-HPMC ezine-viscosities ezahlukeneyo kwisigaba solwelo ziyafana, ezichaza izinga elifanayo lokugcinwa kwamanzi kwe-HPMC eguquliweyo ye-gypsum slurry ene-viscosities eyahlukeneyo.

Ubungakanani besuntswana ligophe losasazo lwe-75000mPa·s HPMC kunye noxinzelelo lwe-1% kumaqondo obushushu ahlukeneyo. Ngokunyuka kweqondo lokushisa, ukubola kombutho we-HPMC we-colloidal kunokufunyanwa ngokucacileyo. Kwi-40 ℃, umthamo omkhulu wombutho we-300nm wanyamalala ngokupheleleyo kwaye ubole ube ngamasuntswana omthamo we-15nm. Ngokunyuka ngakumbi kweqondo lokushisa, i-HPMC iba ngamasuntswana amancinci, kwaye ukugcinwa kwamanzi kwi-gypsum slurry kulahlekile ngokupheleleyo.

Isenzeko seempawu ze-HPMC eziguqukayo ngokunyuka kwamaqondo obushushu zikwabizwa ngokuba ziipropathi zejeli ezishushu, imbono eqhelekileyo ekhoyo kukuba kwiqondo lobushushu eliphantsi, ii-macromolecules ze-HPMC zahlakazwa kuqala emanzini ukunyibilikisa isisombululo, iimolekyuli zeHPMC kuxinzelelo oluphezulu ziya kwenza umbutho omkhulu wamasuntswana. . Xa iqondo lobushushu linyuka, i-hydration ye-HPMC iyancipha, amanzi phakathi kwamatyathanga ngokuthe ngcembe akhutshwa, iikhompawundi ezinkulu zombutho zichithwa ngokuthe ngcembe zibe ngamasuntswana amancinci, i-viscosity yesisombululo iyancipha, kunye nesakhiwo sothungelwano esine-ntathu-dimensional senziwa xa i-gelation. iqondo lobushushu liyafikeleleka, kwaye ijeli emhlophe iyawa.

I-Bodvik yafumanisa ukuba i-microstructure kunye neepropati ze-adsorption ze-HPMC kwisigaba solwelo zatshintshwa. Idityaniswe nethiyori ye-Bulichen ye-HPMC yombutho we-colloidal ovimba umjelo wokuthutha wamanzi aludaka, kwagqitywa ukuba ukunyuka kwamaqondo obushushu kubangele ukuchithwa kwe-HPMC colloidal association, okubangele ukuhla kokugcinwa kwamanzi kwi-gypsum eguquliweyo.

3. Isiphelo

(1) I-Cellulose ether ngokwayo ine-viscosity ephezulu kunye ne-"superimposed" isiphumo kunye ne-gypsum slurry, idlala umphumo ocacileyo wokuqina. Kwiqondo lobushushu begumbi, umphumo wokuqina ubonakala ngakumbi ngokunyuka kwe-viscosity kunye ne-dosage ye-cellulose ether. Nangona kunjalo, ngokunyuka kweqondo lokushisa, i-viscosity ye-cellulose ether iyancipha, umphumo wayo wokuqina uyancipha, uxinzelelo lwe-shear yesivuno kunye ne-viscosity yeplastiki ye-gypsum mix yehla, i-pseudoplasticity iyancipha, kwaye ipropati yokwakha iba mbi.

(2) I-Cellulose ether iphucule ukugcinwa kwamanzi egypsum, kodwa ngokunyuka kwamaqondo obushushu, ukugcinwa kwamanzi kwigypsum eguquliweyo nako kwehle kakhulu, nakwi-60℃ kuya kuphulukana ngokupheleleyo nesiphumo sogcino lwamanzi. Izinga lokugcinwa kwamanzi kwi-gypsum slurry liphuculwe kakhulu nge-cellulose ether, kunye nesantya sokugcinwa kwamanzi kwe-HPMC eguqulelwe kwi-gypsum slurry kunye ne-viscosity eyahlukileyo ngokuthe ngcembe yafikelela kwindawo yokunyuka kunye nokunyuka kwedosi. Ukugcinwa kwamanzi e-Gypsum ngokuqhelekileyo kuhambelana ne-viscosity ye-cellulose ether, kwi-viscosity ephezulu kunempembelelo encinci.

(3) Izinto zangaphakathi ezitshintsha ukugcinwa kwamanzi kwi-ether cellulose kunye nobushushu zihlobene ngokusondeleyo kwi-microscopic morphology ye-cellulose ether kwisigaba solwelo. Kwinqanaba elithile, i-cellulose ether idla ngokudibanisa ukwenza imibutho emikhulu ye-colloidal, ivimbela umjelo wokuthuthwa kwamanzi womxube we-gypsum ukuphumeza ukugcinwa kwamanzi aphezulu. Nangona kunjalo, ngokunyuka kweqondo lokushisa, ngenxa yepropathi ye-thermal gelation ye-cellulose ether ngokwayo, i-redisperses yombutho omkhulu we-colloid ngaphambili, ekhokelela ekunciphiseni kokusebenza kokugcinwa kwamanzi.