Imisebenzi ye-cellulose ether kwi-mortar yile: ukugcinwa kwamanzi, ukunyuka kokubambisana, ukuqina, ukuchaphazela ixesha lokumisela, kunye neempawu zokungenisa umoya. Ngenxa yezi mpawu, inendawo ebanzi yokusetyenziswa kwidaka lezinto zokwakha.
1. Ukugcinwa kwamanzi kwe-cellulose ether yeyona nto ibalulekileyo ekusetyenzisweni kodaka.
Izinto eziphambili ezichaphazela ukugcinwa kwamanzi kwe-cellulose ether: i-viscosity, ubukhulu be-particle size, i-dosage, isithako esisebenzayo, izinga lokuchithwa, indlela yokugcinwa kwamanzi: ukugcinwa kwamanzi kwe-cellulose ether ngokwayo ivela kwi-solubility kunye nokuchithwa kwe-cellulose ether ngokwayo. Nangona ikhonkco lemolekyuli ye-cellulose iqulethe inani elikhulu lamaqela e-hydroxyl aneempawu ezinamandla ze-hydration, ayinyibiliki emanzini. Oku kungenxa yokuba isakhiwo se-cellulose sinezinga eliphezulu le-crystallinity, kwaye amandla okuhambisa amanzi e-hydroxyl yodwa akwanelanga ukutshabalalisa i-intermolecular bonds eyomeleleyo. Iibhondi zeHydrogen kunye ne-van der Waals imikhosi, ngoko iyadumba kuphela kodwa ayinyibiliki emanzini. Xa i-substituent ingeniswe kwitsheyini yeemolekyuli, ayipheleli nje eyophula ibhondi ye-hydrogen, kodwa ne-interchain ye-hydrogen bond iyaphulwa ngenxa yokudityaniswa kwe-substituent phakathi kwamatyathanga akufutshane. Ubukhulu be-substituent, umgama omkhulu phakathi kweeamolekyuli, otshabalalisa umphumo we-hydrogen bond. Inkulu i-cellulose lattice, isisombululo singena emva kokuba i-cellulose lattice yanda, kwaye i-cellulose ether iba yi-soluble yamanzi, yenza isisombululo esiphezulu se-viscosity. Xa izinga lokushisa liphakama, i-hydration ye-polymer iyancipha, kwaye amanzi phakathi kwamaketanga akhutshwa ngaphandle. Xa i-dehydration yanele, iamolekyu ziqala ukudibanisa, zenze isakhiwo senethiwekhi esine-dimensional ezintathu kunye ne-gel precipitation.
(1) Impembelelo yesayizi yesuntswana kunye nexesha lokuxuba i-cellulose ether ekugcinweni kwamanzi
Ngomlinganiselo ofanayo we-cellulose ether, ukugcinwa kwamanzi omdaka kwanda ngokunyuka kwe-viscosity; ukwanda komthamo we-cellulose ether kunye nokunyuka kwe-viscosity kwandisa ukugcinwa kwamanzi omdaka. Xa umxholo we-cellulose ether udlula i-0.3%, utshintsho lokugcinwa kwamanzi omdaka luvame ukulingana. Amandla okugcina amanzi omdaka alawulwa kakhulu ngexesha lokuchithwa, kwaye i-finener cellulose ether iyancibilika ngokukhawuleza, kwaye umthamo wokugcinwa kwamanzi ukhula ngokukhawuleza.
(2) Impembelelo yeqondo le-etherification ye-cellulose ether kunye nobushushu ekugcinweni kwamanzi
Njengoko ubushushu bunyuka, ukugcinwa kwamanzi kuncipha, kwaye iqondo eliphezulu le-etherification ye-cellulose ether, ngcono ukugcinwa kwamanzi obushushu obuphezulu be-cellulose ether. Ngexesha lokusetyenziswa, iqondo lobushushu bodaka olutsha oluxutywe ngokuqhelekileyo lingaphantsi kwe-35 ° C, kwaye phantsi kweemeko zemozulu ezikhethekileyo, ubushushu bunokufikelela okanye budlule kwi-40 ° C. Kule meko, ifomula kufuneka ihlengahlengiswe kwaye imveliso enezinga eliphezulu le-etherification kufuneka ikhethwe. Oko kukuthi, qwalasela ukukhetha i-ether cellulose efanelekileyo.
2. Impembelelo ye-cellulose ether kumxholo womoya wodaka
Kwiimveliso zodaka ezixubeneyo ezomileyo, ngenxa yokongezwa kwe-cellulose ether, inani elithile leebhubhu zomoya ezincinci, ezisasazwa ngokufanayo kunye nezizinzileyo zingeniswa kumdaka oxubileyo. Ngenxa yempembelelo yebhola yeebhubhu zomoya, udaka lunokusebenza kakuhle kwaye lunciphisa ukuxhatshazwa komdaka. Ukuqhekeka kunye nokuncipha, kunye nokunyusa izinga lemveliso yodaka.
3. Impembelelo ye-cellulose ether kwi-samente hydration
I-ether ye-cellulose ine-retardation kwi-hydration ye-cement-based mortar, kwaye umphumo wokunciphisa uphuculwe ngokunyuka kwe-cellulose ether content. Izinto ezichaphazelayo ze-cellulose ether kwi-cement hydration zezi: i-dosage, i-degree of etherification, uhlobo lwesamente.
Ixesha lokuposa: Feb-02-2023