Iselulose ether eludaka lwesamente olulungisiweyo

Impembelelo yesakhiwo semolekyuli esahlukileyo se-non-ionic cellulose ether kwisakhiwo se-pore ye-sement slurry yaphononongwa ngovavanyo lokuxinana kokusebenza kunye nokuqwalaselwa kwesakhiwo se-pore macroscopic kunye ne-microscopic. Iziphumo zibonisa ukuba i-nonionic cellulose ether inokunyusa i-porosity ye-sement slurry. Xa i-viscosity ye-non-ionic cellulose ether modified slurry ifana, i-porosityi-hydroxyethyl cellulose ether(HEC) i-slurry elungisiweyo incinci kune-hydroxypropyl methyl cellulose ether (HPMC) kunye ne-methyl cellulose ether (MC) i-slurry eguqulwayo. Ukunciphisa i-viscosity / ubunzima be-molecular ye-HPMC cellulose ether kunye nomxholo weqela elifanayo, i-porosity encinci ye-sement slurry yayo. I-ether ye-cellulose engeyiyo i-ionic inokunciphisa ukuxinana komphezulu wesigaba solwelo kwaye yenze udaka lwesamente lube lula ukwenza amaqamza. Iimolekyuli ze-ether ze-cellulose ezingezona i-ionic zibhengezwa ngokuthe ngqo kwi-interface ye-gas-liquid yamaqamza, ekwanyusa i-viscosity yesigaba se-sement slurry kunye nokwandisa amandla odaka lwesamente ukuzinzisa amaqamza.

Amagama angundoqo:i-nonionic cellulose ether; Udaka lwesamente; Ubume bePore; Ubume bemolekyuli; Ukuxinana komphezulu; i-viscosity

I-nonionic cellulose ether (emva koku ibizwa ngokuba yi-cellulose ether) inokuqina okugqwesileyo kunye nokugcinwa kwamanzi, kwaye isetyenziswa ngokubanzi kudaka oluxubeneyo olomileyo, ikhonkrithi ezenzelayo kunye nezinye izinto ezintsha ezisekwe kwisamente. I-cellulose ethers esetyenziswa kwizinto ezisekelwe kwisamente idla ngokubandakanya i-methyl cellulose ether (MC), i-hydroxypropyl methyl cellulose ether (HPMC), i-hydroxyethyl methyl cellulose ether (HEMC) kunye ne-hydroxyethyl cellulose ether (HEC), phakathi kwayo i-HPMC kunye ne-HEMC zizicelo eziqhelekileyo. .

I-ether ye-cellulose inokuchaphazela kakhulu isakhiwo se-pore ye-sement slurry. I-Pourchez et al., ngovavanyo olucacileyo loxinaniso, uvavanyo lobungakanani bepore (indlela yokutofa i-mercury) kunye nohlalutyo lomfanekiso we-seM, bagqibe kwelokuba i-cellulose ether inokunyusa inani leepores ezinobubanzi obungange-500nm kunye neepores ezinobubanzi obungange-50-250μm udaka lwesamente. Ngaphezu koko, kwi-slurry yesamente eqinile, Ukuhanjiswa kobungakanani bepore ubunzima obuphantsi bemolekyuli ye-HEC eguqulelwe ngodaka lwesamente iyafana naleyo yodaka lwesamente ecocekileyo. Umthamo wepore opheleleyo wobunzima bemolekyuli ephezulu ye-HEC eguquliweyo uludaka lwesamente luphezulu kunoludaka lwesamente olusulungekileyo, kodwa lungaphantsi kunoludaka lwesamente olulungisiweyo lwe-HPMC oluphantse lufane ngokufanayo. Ngokujonga kwe-SEM, uZhang et al. ifumene ukuba i-HEMC inokunyusa kakhulu inani lee-pores kunye nobubanzi malunga ne-0.1mm kwi-samente yodaka. Baye bafumanisa ngovavanyo lwenaliti ye-mercury ukuba i-HEMC inokunyusa kakhulu umthamo wepore kunye ne-avareji ye-pore ububanzi be-slurry yesamente, okubangele ukwanda okukhulu kwenani leepores ezinkulu ezinobubanzi obuyi-50nm ~ 1μm kunye neepore ezinkulu ezinobubanzi obungaphezulu. ngaphezu kwe-1μm. Nangona kunjalo, inani leepores ezinobubanzi obungaphantsi kwe-50nm lancitshiswa kakhulu. Saric-Coric et al. babekholelwa ukuba i-cellulose ether iya kwenza i-samente slurry ibe ne-porous ngakumbi kwaye ikhokelele ekwandeni kwee-macropores. UJenni et al. ivavanye ubuninzi bokusebenza kwaye yagqiba ukuba i-pore volume fraction ye-HEMC eguqulelwe udaka lwesamente yayimalunga ne-20%, ngelixa udaka lwe-samente olucocekileyo luqulethe kuphela umlinganiselo omncinci womoya. USilva et al. bafumanise ukuba ukongeza kwiincopho ezimbini kwi-3.9 nm kunye ne-40 ~ 75nm njengodaka lwesamente olusulungekileyo, bekukho neencopho ezimbini kwi-100 ~ 500nm nangaphezulu kwe-100μm ngovavanyo lwenaliti yemercury. UMa Baoguo et al. yafumanisa ukuba i-ether cellulose yandisa inani leepores ezintle ezinobubanzi obungaphantsi kwe-1μm kunye neepore ezinkulu ezinobubanzi obukhulu kune-2μm kudaka lwesamente ngovavanyo lwenaliti yemekyuri. Ngokuphathelele isizathu sokuba i-ether ye-cellulose inyuse i-porosity ye-sement slurry, ngokuqhelekileyo kukholelwa ukuba i-ether ye-cellulose inomsebenzi ongaphezulu, iya kutyebisa emoyeni kunye nojongano lwamanzi, yenze ifilimu, ukwenzela ukuzinzisa amaqamza kwi-sement slurry.

Ngokusebenzisa uhlalutyo loncwadi olungasentla, kunokubonwa ukuba umphumo we-cellulose ether kwisakhiwo se-pore sezinto ezisekelwe kwi-samente ifumene ingqalelo enkulu. Nangona kunjalo, zininzi iintlobo ze-ether cellulose, uhlobo olufanayo lwe-ether cellulose, ubunzima bayo bemolekyuli, umxholo weqela kunye nezinye iiparamitha zesakhiwo semolekyuli nazo zahluke kakhulu, kwaye abaphandi basekhaya nabangaphandle kukhetho lwe-cellulose ether lulinganiselwe kuphela kwisicelo sabo. intsimi, ukungabikho kokumelwa, isiphelo singenakuphepheka "ukugqithisa ngokubanzi", ukwenzela ukuba inkcazo ye-cellulose ether mechanism ayinzulu ngokwaneleyo. Kweli phepha, isiphumo se-cellulose ether enesakhiwo esahlukileyo semolekyuli kwisakhiwo se-pore ye-samente slurry yaphononongwa ngovavanyo olubonakalayo lokuxinana kunye nokubonwa kwesakhiwo se-pore macroscopic kunye ne-microscopic.

1. Uvavanyo

1.1 IiMathiriyeli ezikrwada

I-samente yayiyi-P · O 42.5 yesamente eqhelekileyo yasePortland eyenziwe yi-Huaxin Cement Co., LTD., apho ukubunjwa kweekhemikhali kwalinganiswa nge-AXIOS Ad-Vanced wavelength dispersion-type X-ray fluorescence spectrometer (PANa - lytical, Netherlands), kwaye ukubunjwa kwesigaba kuqikelelwe yindlela yeBogue.

I-ether ye-Cellulose ikhethe iindidi ezine ze-ether ye-cellulose yorhwebo, ngokulandelelana i-methyl cellulose ether (MC), i-hydroxypropyl methyl cellulose ether (HPMC1, HPMC2) kunye ne-hydroxyethyl cellulose ether (HEC), i-HPMC1 i-molecular structure kunye ne-HPMC2 efanayo, kodwa i-viscosity ingaphantsi kakhulu kune-HPMC2 , Oko kukuthi, ubunzima bemolekyuli be-HPMC1 buncinci kakhulu kunobo be-HPMC2. Ngenxa yeepropati ezifanayo ze-hydroxyethyl methyl cellulose ether (HEMc) kunye ne-HPMC, ii-HEMC azikhethwanga kolu cwaningo. Ukuthintela impembelelo yesiqulatho sokufuma kwiziphumo zovavanyo, zonke i-cellulose ethers zabhakwa kwi-98℃ i-2h phambi kokusetyenziswa.

I-viscosity ye-cellulose ether yavavanywa yi-NDJ-1B ye-rotary viscosimeter (iNkampani ye-Shanghai Changji). Uxinzelelo lwesisombululo sovavanyo (umlinganiselo we-cellulose ether kumanzi) wawuyi-2.0%, izinga lokushisa laliyi-20 ℃, kwaye izinga lokujikeleza laliyi-12r / min. Ukunyanzeliswa komphezulu we-cellulose ether kwavavanywa ngendlela yeringi. Isixhobo sovavanyo yayiyi-tensiometer ye-JK99A ezenzekelayo (i-Shanghai Zhongchen Company). Ukugxininiswa kwesisombululo sovavanyo kwakuyi-0.01% kunye nobushushu be-20 ℃. Umxholo weqela le-ether ye-cellulose unikezelwa ngumenzi.

Ngokutsho kwe-viscosity, ukuxhatshazwa kwendawo kunye nomxholo weqela le-cellulose ether, xa i-concentration ye-2.0%, i-viscosity ratio ye-HEC kunye ne-HPMC2 isisombululo ngu-1: 1.6, kunye ne-viscosity ratio ye-HEC kunye ne-MC isisombululo ngu-1: 0.4, kodwa kolu vavanyo, umlinganiselo wesamente wamanzi ngu-0.35, umlinganiselo ophezulu wesamente ngu-0.6%, umlinganiselo we-cellulose ether kumanzi malunga ne-1.7%, ngaphantsi kwe-2.0%, kunye nefuthe le-synergistic ye-cement slurry kwi-viscosity, ngoko ke Umahluko we-viscosity we-HEC, i-HPMC2 okanye i-MC eguqulelwe ngodaka lwesamente incinci.

Ngokutsho kwe-viscosity, ukunyanzeliswa komphezulu kunye nomxholo weqela le-ether ye-cellulose, ukunyanzeliswa komphezulu we-ether ye-cellulose nganye kwahlukile. I-cellulose ether inamaqela amabini e-hydrophilic (i-hydroxyl kunye namaqela e-ether) kunye namaqela e-hydrophobic (i-methyl kunye ne-glucose carbon ring), i-surfactant. I-ether ye-cellulose iyahluka, uhlobo kunye nomxholo wamaqela e-hydrophilic kunye ne-hydrophobic ahlukeneyo, okubangelwa ukuxinana komhlaba ohlukeneyo.

1.2 Iindlela zovavanyo

Iintlobo ezintandathu zodaka lwesamente zalungiswa, kubandakanywa uludaka lwesamente olusulungekileyo, i-ether ye-cellulose emine (MC, HPMCl, HPMC2 kunye ne-HEC) i-slurry yesamente elungisiweyo kunye ne-0.60% yomlinganiselo wesamente kunye ne-HPMC2 eguqulelwe ngodaka lwesamente kunye ne-0.05% yomlinganiselo wesamente. Ref, MC - 0.60, HPMCl - 0.60, Hpmc2-0.60. I-HEC 1-0.60 kunye ne-hpMC2-0.05 ibonisa ukuba umlinganiselo wamanzi-samente zombini yi-0.35.

Udaka lwesamente kuqala ngokuhambelana ne-GB/T 17671 1999 "indlela yokuvavanya amandla odaka lwesamente (indlela ye-ISO)" eyenziwe kwibhloko yovavanyo lwe-40mm×40mm×160mm yeprisms, phantsi kwemeko ye-20℃ etywiniweyo yokunyanga i-28d. Emva kokulinganisa kunye nokubala ukuxinana kwayo okubonakalayo, yaqhekezwa yavuleka ngehamile encinci, kwaye imeko ye-macro hole yecandelo eliphakathi kwebhloko yovavanyo yabonwa kwaye yafotwa ngekhamera yedijithali. Kwangaxeshanye, iziqwenga ezincinci ze-2.5 ~ 5.0mm zathathwa ukuze ziqwalaselwe ngemakroskopu ebonakalayo (i-HIROX i-microscope yevidiyo emacala amathathu) kunye nokuskena i-electron microscope (JSM-5610LV).

2. Iziphumo zovavanyo

2.1 Ukuxinana okubonakalayo

Ngokoxinaniso olubonakalayo lodaka lwesamente olulungiswe zii-ethers zeselulosi ezahlukeneyo, (1) ingxinano ebonakalayo yodaka lwesamente ecocekileyo yeyona iphezulu, eyi-2044 kg/m³; Uxinaniso olubonakalayo lweentlobo ezine ze-cellulose ether eludaka olulungisiweyo kunye nomlinganiselo wesamente we-0.60% wawuyi-74% ~ 88% yoludaka lwesamente ecocekileyo, ebonisa ukuba i-cellulose ether ibangele ukwanda kwe-porosity ye-slurry yesamente. (2) Xa umlinganiselo wesamente kwisamente yi-0.60%, umphumo weethers ze-cellulose ezahlukeneyo kwi-porosity ye-cement slurry yahluke kakhulu. I-viscosity ye-HEC, i-HPMC2 kunye ne-MC eguquliwe i-cement slurry iyafana, kodwa ukuxinwa okubonakalayo kwe-HEC ukuguqulwa kwe-cement slurry kuphezulu, kubonisa ukuba i-porosity ye-HEC eguqulelwe kwi-cement slurry incinci kune-HPMc2 kunye ne-Mc modified slurry ye-cement kunye ne-visco slurry efanayo. . I-HPMc1 kunye ne-HPMC2 zinomxholo weqela elifanayo, kodwa i-viscosity ye-HPMCl ingaphantsi kakhulu kune-HPMC2, kunye noxinano olubonakalayo lwe-HPMCl ludaka lwesamente olulungisiweyo luphezulu kakhulu kunoludaka lwesamente oluguquliweyo lwe-HPMC2, olubonisa ukuba xa umxholo weqela ufana. , iphantsi i-viscosity ye-cellulose ether, iphantsi i-porosity ye-slurry ye-samente elungisiweyo. (3) Xa umlinganiselo wesamente ukuya kwisamente uncinci kakhulu (0.05%), ukuxinana okubonakalayo kwe-HPMC2-modified slurry yesamente ngokusisiseko kusondele kwi-slurry ecocekileyo yesamente, ebonisa ukuba umphumo we-cellulose ether kwi-porosity yesamente. udaka luncinci kakhulu.

2.2 Umngxuma omkhulu

Ngokutsho kweefoto zecandelo le-cellulose ether eguqulelwe kwi-sement slurry ethathwe yikhamera yedijithali, i-sement slurry ecocekileyo ixinene kakhulu, phantse akukho pores ebonakalayo; Iindidi ezine ze-cellulose ether ephuculweyo ye-slurry ene-0.60% ye-cement ratio zonke zineepores ezininzi ze-macroscopic, ebonisa ukuba i-cellulose ether ikhokelela ekwandeni kwe-sement slurry porosity. Ngokufana neziphumo zovavanyo loxinaniso olubonakalayo, isiphumo seentlobo ezahlukeneyo ze-cellulose ether kunye neziqulatho kwi-porosity ye-samente slurry yahluke kakhulu. I-viscosity ye-HEC, i-HPMC2 kunye ne-MC eguquliweyo i-slurry iyafana, kodwa i-porosity ye-HEC eguquliweyo i-slurry incinci kune-HPMC2 kunye ne-MC modified slurry. Nangona i-HPMC1 kunye ne-HPMC2 zinomxholo weqela elifanayo, i-HPMC1 eguqulelwe ngodaka kunye ne-viscosity esezantsi ine-porosity encinci. Xa umlinganiselo wesamente ukuya kwisamente we HPMc2 udaka oluguquliweyo luncinci kakhulu (0.05%), inani le pores macroscopic linyuswe kancinci kunelo lodaka lwesamente olusulungekileyo, kodwa luncitshiswe kakhulu kunoludaka olulungisiweyo lweHPMC2 nge 0.60% yesamente-kuya -umlinganiselo wesamente.

2.3 Umngxuma omkroskophu

4. Isiphelo

(1) I-ether ye-cellulose inokunyusa i-porosity ye-sement slurry.

(2) Umphumo we-cellulose ether kwi-porosity ye-cement slurry kunye neeparameters ezahlukeneyo zesakhiwo se-molecular iyahluka: xa i-viscosity ye-cellulose ether eguqulelwe i-cement slurry ifana, i-porosity ye-HEC eguqulelwe i-cement slurry incinci kune-HPMC kunye ne-MC eguqulweyo. udaka lwesamente; Ukunciphisa i-viscosity / ubunzima be-molecular ye-HPMC cellulose ether kunye nomxholo weqela elifanayo, iphantsi kwe-porosity ye-slurry yayo yesamente elungisiweyo.

(3) Emva kokongeza i-etere yeselulosi kudaka lwesamente, ukuxinana komphezulu wesigaba solwelo kuncitshisiwe, ukuze uludaka lwesamente lube lula ukwenza amaqamza i-cellulose ietere iimolekyuli zolwalathiso olukhokelela kwi-adsorption ye-bubble yegesi-ulwelo, ukuphucula amandla kunye nokuqina kwe-ether. iqamza elulwelo lwefilim ye-adsorption kwi-bubble gas-liquid interface, ukuphucula amandla efilimu yolwelo lweqamza kwaye womeleze isakhono sodaka olunzima ukuzinzisa iqamza.