I-ether ye-cellulose inokuphucula kakhulu ukusebenza kodaka olumanzi, kwaye iyona nto yongezwayo echaphazela ukwakhiwa kodaka. Ukukhethwa okufanelekileyo kwee-cellulose ethers zeentlobo ezahlukeneyo, i-viscosities eyahlukeneyo, ubukhulu beentlobo ezahlukeneyo, iidigri ezihlukeneyo ze-viscosity kunye neemali ezongezelelweyo ziya kuba nefuthe elihle ekuphuculeni ukusebenza kwe-powder mortar. Okwangoku, udaka oluninzi lwe-masonry kunye ne-plastering lunokusebenza okungahambi kakuhle kokugcinwa kwamanzi, kwaye i-slurry yamanzi iya kwahlula emva kwemizuzu embalwa yokuma. Ukugcinwa kwamanzi ngumsebenzi obalulekileyo we-methyl cellulose ether, kwaye ikwayintsebenzo eyenziwa ngabavelisi abaninzi basekhaya abaxubene nodaka, ngakumbi abo bakwiingingqi ezisemazantsi ezinobushushu obuphezulu, banikele ingqalelo kuyo. Izinto ezichaphazela umphumo wokugcinwa kwamanzi kwi-powder mortar eyomileyo ziquka ubungakanani bokongeza, i-viscosity, i-fineness of particles, kunye nobushushu bendawo yokusetyenziswa.
Ukugcinwa kwamanzi kwe-cellulose ether
Kwimveliso yezinto zokwakha, ngakumbi udaka oluyimpuphu eyomileyo, i-cellulose ether idlala indima engenakulinganiswa, ngakumbi ekuveliseni udaka olukhethekileyo (udaka olulungisiweyo), luyinto eyimfuneko kwaye ibalulekileyo. Indima ebalulekileyo ye-ether ye-cellulose e-soluble yamanzi kwi-mortar ikakhulu inemiba emithathu, enye inamandla okugcina amanzi, enye yimpembelelo ehambelanayo kunye ne-thixotropy yodaka, kwaye okwesithathu kukusebenzisana nesamente. Ukugcinwa kwamanzi kwi-ether ye-cellulose kuxhomekeke ekufunjweni kwamanzi kwinqanaba lesiseko, ukubunjwa kodaka, ubukhulu bodaka lodaka, imfuno yamanzi yodaka, kunye nexesha lokumisela izinto zokumisela. Ukugcinwa kwamanzi kwe-cellulose ether ngokwayo kuvela kwi-solubility kunye nokuphelelwa ngamanzi kwe-cellulose ether ngokwayo. Njengoko sonke sisazi, nangona i-cellulose i-molecular chain iqulethe inani elikhulu lamaqela e-OH anamandla, ayinyibiliki emanzini, kuba isakhiwo se-cellulose sinezinga eliphezulu le-crystallinity. Isakhono se-hydration samaqela e-hydroxyl iyodwa akwanelanga ukugubungela iibhondi ze-hydrogen ezomeleleyo kunye ne-van der Waals phakathi kwee-molecule. Ngoko ke, idumba kuphela kodwa ayinyibiliki emanzini. Xa i-substituent ingeniswa kwitsheyina le-molecular, kungekhona nje i-substituent etshabalalisa ikhonkco le-hydrogen, kodwa kunye ne-interchain ye-hydrogen bond iyatshatyalaliswa ngenxa yokutshatyalaliswa kwe-substituent phakathi kwamatyathanga akufutshane. Ubukhulu be-substitute, umgama omkhulu phakathi kweemolekyuli. Umgama mkhulu. Umphumo omkhulu wokutshabalalisa iibhondi ze-hydrogen, i-ether ye-cellulose iba yi-soluble yamanzi emva kokuba i-cellulose lattice yanda kwaye isisombululo singena, senza isisombululo esiphezulu se-viscosity. Xa izinga lokushisa liphakama, i-hydration ye-polymer iyancipha, kwaye amanzi phakathi kwamaketanga akhutshwa ngaphandle. Xa isiphumo sokuchithwa kwamanzi sanele, iamolekyu ziqala ukudibanisa, zenza i-gel yesakhiwo senethiwekhi ye-dimensional emithathu kwaye ihlanganiswe ngaphandle.
Ngokuqhelekileyo, okukhona i-viscosity iphezulu, ngcono isiphumo sokugcina amanzi. Nangona kunjalo, ukuphakama kwe-viscosity kunye nokuphakama kwe-molecular weight, ukuhla okuhambelanayo kwi-solubility yayo kuya kuba nefuthe elibi kumandla kunye nokusebenza kokwakhiwa kodaka. Ukuphakama kwe-viscosity, kubonakala ngakumbi impembelelo yokuqina kumdaka, kodwa ayilingani ngokuthe ngqo. Ukuphakama kwe-viscosity, i-viscous ngakumbi i-mortar emanzi iya kuba, oko kukuthi, ngexesha lokwakha, kubonakaliswa njengokunamathela kwi-scraper kunye nokunamathela okuphezulu kwi-substrate. Kodwa akuncedi ukunyusa amandla esakhiwo sodaka olumanzi ngokwalo. Ngexesha lokwakha, ukusebenza kwe-anti-sag akubonakali. Ngokuchasene noko, i-viscosity ethile ephakathi kunye nephantsi kodwa i-methyl cellulose ethers elungisiweyo inomsebenzi ogqwesileyo ekuphuculeni amandla okwakhiwa kodaka olumanzi.
Ukutyeba kunye Thixotropy yeCellulose Etere
Kukwakho nobudlelwane obuhle bomgca phakathi kokungaguquguquki kwentlama yesamente kunye nedosi ye-cellulose ether. I-ether ye-cellulose inokunyusa kakhulu i-viscosity yodaka. Ubukhulu bedosi, kokukhona isiphumo esicacileyo. I-high-viscosity cellulose ether isisombululo samanzi sine-thixotropy ephezulu, ekwayimpawu enkulu ye-cellulose ether.
Ukutyeba kuxhomekeke kwiqondo lepolymerization ye-cellulose ether, i-concentration yesisombululo, izinga lokucheba, ubushushu kunye nezinye iimeko. Ipropati ye-gelling yesisombululo iyingqayizivele kwi-alkyl cellulose kunye ne-derivatives yayo eguqulwayo. Iimpawu ze-gelation zihambelana neqondo lokutshintshwa, ukugxininiswa kwesisombululo kunye nezongezo. Kwiimveliso eziguqulweyo ze-hydroxyalkyl, iipropati zejeli nazo zihambelana neqondo lokuguqulwa kwe-hydroxyalkyl. Kuba viscosity low MC kunye HPMC, 10% -15% isisombululo ingalungiswa, viscosity medium MC kunye HPMC ingalungiswa 5% -10% isisombululo, lo gama viscosity eliphezulu MC kunye HPMC ungalungisa kuphela 2% -3% isisombululo, kwaye Ngokuqhelekileyo. Ukuhlelwa kwe-viscosity ye-cellulose ether iphinda ihlelwe yi-1% -2% isisombululo. Ubunzima bemolekyuli ephezulu ye-cellulose ether inokuqina okuphezulu. Kwisisombululo esifanayo soxinaniso, iipolymers ezinobunzima beemolekyuli ezahlukeneyo zinee-viscosities ezahlukeneyo. Iqondo eliphezulu. I-viscosity ekujoliswe kuyo inokufezekiswa kuphela ngokongeza inani elikhulu le-ether ye-cellulose ephantsi ye-molecular weight. I-viscosity yayo inokuxhomekeka okuncinci kwireyithi yokucheba, kwaye i-viscosity ephezulu ifikelela kwi-viscosity ekujoliswe kuyo, kwaye inani elifunekayo lokongeza lincinci, kwaye i-viscosity ixhomekeke ekusebenzeni kakuhle. Ngoko ke, ukufezekisa ukuhambelana okuthile, inani elithile le-cellulose ether (ukugxilwa kwesisombululo) kunye ne-viscosity yesisombululo kufuneka kuqinisekiswe. Iqondo lokushisa le-gel yesisombululo liyancipha ngokuhambelana nokunyuka koxinzelelo lwesisombululo, kunye neegels kwiqondo lokushisa emva kokufikelela kwinqanaba elithile. Uxinzelelo lwe-gelling lwe-HPMC luphezulu ngokwentelekiso kwiqondo lobushushu begumbi.
Ukunciphisa i-Cellulose Ether
Umsebenzi wesithathu we-cellulose ether kukulibazisa inkqubo ye-hydration yesamente. I-Cellulose ether inika udaka oluneepropati ezahlukeneyo eziluncedo, kwaye inciphisa kwakhona ubushushu bokuqala be-hydration yesamente kwaye ilibazise inkqubo ye-hydration eguquguqukayo yesamente. Oku akulunganga ukusetyenziswa kodaka kwiindawo ezibandayo. Esi siphumo sokubuyisela sibangelwa yi-adsorption ye-cellulose ether molecules kwiimveliso ze-hydration ezifana ne-CSH kunye ne-ca (OH) i-2. Ngenxa yokunyuka kwe-viscosity yesisombululo se-pore, i-ether ye-cellulose iyanciphisa ukuhamba kwe-ion kwisisombululo, ngaloo ndlela ilibazise inkqubo ye-hydration. Ukuphakama koxinzelelo lwe-cellulose ether kwizinto ze-mineral gel, isiphumo esicacileyo sokulibaziseka kwe-hydration. I-ether ye-cellulose ayilibazisi nje ukubeka, kodwa iphinda ilibazise inkqubo yokuqina kwenkqubo yodaka lwesamente. Umphumo wokunciphisa i-cellulose ether ayixhomekanga kuphela ekugxininiseni kwayo kwinkqubo ye-gel mineral, kodwa nakwisakhiwo samachiza. Ukuphakama kweqondo le-methylation ye-HEMC, ingcono isiphumo sokubuyiswa kwe-cellulose ether. Umlinganiselo we-hydrophilic substitution ukuya endaweni yokwandisa amanzi Umphumo wokubuyisela unamandla. Nangona kunjalo, i-viscosity ye-cellulose ether inefuthe elincinci kwi-cement hydration kinetics.
Kumdaka, i-cellulose ether idlala indima yokugcina amanzi, ukuqina, ukulibazisa amandla e-samente, kunye nokuphucula ukusebenza kokwakhiwa. Umthamo olungileyo wokugcinwa kwamanzi wenza i-samente i-hydration igqibeke ngakumbi, inokuphucula i-viscosity emanzi yodaka olumanzi, ukwandisa amandla okubopha udaka, kunye nokulungelelanisa ixesha. Ukongeza i-cellulose ether kumatshini wokutshiza udaka kunokuphucula ukutshiza okanye ukumpompa ukusebenza kunye namandla okwakhiwa kodaka. Ngoko ke, i-cellulose ether isetyenziswa ngokubanzi njengesongezo esibalulekileyo kwi-mortar esele ixutywe
Ixesha lokuposa: Dec-26-2022