I-ether ye-cellulose inokugcinwa kwamanzi okugqwesileyo, okunokuthi kuthintele ukufuma kumdaka omanzi ukuba uphume ngaphambi kwexesha okanye ukufunxwa ngumaleko wesiseko, kwaye uqinisekise ukuba i-samente ifakwe ngokupheleleyo emanzini, ngaloo ndlela iqinisekisa iimpawu zomatshini zodaka, oluncedo kakhulu. udaka olucekethekileyo kunye neziseko ezifunxa amanzi okanye udaka olwakhiwe phantsi kobushushu obuphezulu kunye neemeko ezomileyo. Isiphumo sokugcinwa kwamanzi se-cellulose ether sinokutshintsha inkqubo yokwakha yendabuko kunye nokuphucula inkqubela phambili yokwakha. Ngokomzekelo, ukwakhiwa kwe-plastering kunokuqhutyelwa kwii-substrates ezifunxa amanzi ngaphandle kokumanzisa kwangaphambili.
I-viscosity, i-dosage, ubushushu be-ambient kunye nesakhiwo semolekyuli ye-cellulose ether inempembelelo enkulu ekusebenzeni kwayo kokugcinwa kwamanzi. Phantsi kweemeko ezifanayo, ubukhulu be-viscosity ye-cellulose ether, ngcono ukugcinwa kwamanzi; okukhona idosi iphezulu, kokukhona ugcino lwamanzi lungcono. Ngokuqhelekileyo, umlinganiselo omncinci we-ether ye-cellulose unokuphucula kakhulu ukugcinwa kwamanzi kwidaka. Xa idosi ifikelela kwindawo ethile Xa iqondo lokugcinwa kwamanzi linyuka, indlela yokugcinwa kwamanzi iyancipha; xa ubushushu be-ambient bunyuka, ukugcinwa kwamanzi kwe-cellulose ether ngokuqhelekileyo kuncipha, kodwa ezinye ii-ethers ze-cellulose ezilungisiweyo zikwanokugcinwa kwamanzi okungcono phantsi kweemeko eziphezulu zokushisa; iintsinga ezinedigri ezisezantsi zokutshintshwa kweVegan ether inomsebenzi ongcono wokugcina amanzi.
Iqela le-hydroxyl kwi-cellulose ether molecule kunye ne-athomu ye-oksijini kwi-ether bond iya kudibanisa ne-molecule yamanzi ukuze yenze i-hydrogen bond, iguqule amanzi akhululekile kumanzi adibeneyo, ngaloo ndlela idlala indima enhle ekugcineni amanzi; imolekyuli yamanzi kunye ne-cellulose ether molecular chain Interdiffusion ivumela iimolekyuli zamanzi ukuba zingene ngaphakathi kwe-cellulose ether macromolecular chain kwaye ixhomekeke kwimikhosi eqinile yokubopha, ngaloo ndlela ibumba amanzi abophekileyo kunye namanzi abanjwe, okuphucula ukugcinwa kwamanzi kwi-slurry ye-samente; i-cellulose ether iphucula i-sement slurry entsha. Iimpawu ze-rheological, i-porous network structure kunye noxinzelelo lwe-osmotic okanye iipropathi zefilimu ze-cellulose ether zithintela ukusasazwa kwamanzi.
I-cellulose ether inika udaka olumanzi kunye ne-viscosity egqwesileyo, enokunyusa kakhulu amandla okudibanisa phakathi kodaka olumanzi kunye nomgangatho wesiseko, kunye nokuphucula ukusebenza kodaka lodaka. Isetyenziswa ngokubanzi kudaka lokutyabeka, udaka lwebhondi yezitena kunye nenkqubo yokugquma eludongeni yangaphandle. Isiphumo esityebileyo se-cellulose ether sinokwandisa amandla okulwa nokusasazeka kunye ne-homogeneity yezinto ezixubeneyo ezisanda kuhlanganiswa, ukuthintela i-delamination yezinto, ulwahlulo kunye nokopha, kwaye inokusetyenziswa kwikhonkrithi yefiber, ikhonkrithi engaphantsi kwamanzi kunye ne-self-compacting concrete.
Umphumo wokuqina we-cellulose ether kwizinto ezisekelwe kwi-samente zivela kwi-viscosity yesisombululo se-cellulose ether. Phantsi kweemeko ezifanayo, okukhona i-viscosity ye-cellulose ether iphezulu, ingcono i-viscosity yezinto eziguquliweyo zesamente, kodwa ukuba i-viscosity iphezulu kakhulu, iya kuchaphazela umbane kunye nokusebenza kwezinto (ezifana nokuncamathelisa imela yokutyabeka. ). I-self-leveling mortar kunye ne-self-compacting concrete, efuna i-fluidity ephezulu, idinga i-viscosity ephantsi ye-cellulose ether. Ukongezelela, umphumo wokuqina we-cellulose ether uya kwandisa imfuno yamanzi yezinto ezisekelwe kwi-samente kunye nokwandisa isivuno sodaka.
I-viscosity yesisombululo se-cellulose ether ixhomekeke kule miba ilandelayo: ubunzima bemolekyuli ye-cellulose ether, i-concentration, iqondo lokushisa, izinga le-shear kunye nendlela yokuvavanya. Ngaphantsi kweemeko ezifanayo, ubukhulu be-molecular weight of cellulose ether, buphezulu i-viscosity yesisombululo; i-concentration ephezulu, iphezulu i-viscosity yesisombululo. Xa uyisebenzisa, kufuneka kuthathelwe ingqalelo ukuphepha umthamo ogqithisileyo kwaye uchaphazele ukusebenza kodaka kunye nekhonkrithi; i-cellulose ether I-viscosity yesisombululo se-ether iya kuncipha ngokunyuka kweqondo lokushisa, kwaye iphakamileyo yoxinaniso, impembelelo enkulu yeqondo lokushisa; Isisombululo se-cellulose ether ngokuqhelekileyo i-pseudoplastic fluid kunye nepropati ye-shear thinning, i-high rate rate ye-shear ngexesha lovavanyo, i-viscosity encinci, ngoko ke, ukudibanisa komdaka kuya kuncipha phantsi kwesenzo samandla angaphandle, onenzuzo ukukhuhla ukwakhiwa kodaka, ukwenzela ukuba udaka lube nokusebenza kakuhle kunye nokubambisana ngexesha elifanayo; ngenxa yokuba isisombululo se-ether se-cellulose asiyo-Newtonian Ulwelo, xa iindlela zovavanyo, izixhobo kunye nezixhobo okanye iimeko zokuvavanya ezisetyenziselwa ukuvavanya i-viscosity zahlukile, iziphumo zovavanyo lwesisombululo esifanayo se-ether cellulose ziya kwahluka kakhulu.
Iimolekyuli ze-ether ze-cellulose zinokulungisa ezinye iimolekyuli zamanzi zezinto ezitsha kwi-periphery ye-molecular chain, ngaloo ndlela ukwandisa i-viscosity yesisombululo. Amatyathanga e-molecular ether cellulose adityanisiwe ukuze enze i-network-dimensional network structure, eya kwenza isisombululo sayo samanzi sibe ne-viscosity enhle.
I-high-viscosity cellulose ether isisombululo samanzi sine-thixotropy ephezulu, ekwayimpawu enkulu ye-cellulose ether. Izisombululo ezimanzi ze-methyl cellulose zihlala zine-pseudoplastic kunye ne-non-thixotropic fluidity ngaphantsi kweqondo lokushisa lejeli, kodwa zibonisa iipropathi ezihamba ngeNewtonian kumazinga aphantsi okucheba. I-Pseudoplasticity iyanda kunye nobunzima be-molecular okanye i-concentration ye-cellulose ether, kungakhathaliseki ukuba luhlobo luni lwe-substitute kunye neqondo lokutshintshwa. Ngoko ke, i-cellulose ethers yebakala elifanayo le-viscosity, kungakhathaliseki ukuba i-mc, i-HPmc, i-HEmc, iya kuhlala ibonisa iimpawu ezifanayo ze-rheological nje ngokuba ugxininiso kunye nobushushu bugcinwa rhoqo. Iigels zesakhiwo zenziwe xa ubushushu buphakanyisiwe, kwaye ukuhamba okuphezulu kwe-thixotropic kwenzeka. Uxinzelelo oluphezulu kunye ne-viscosity ephantsi ye-cellulose ethers ibonisa i-thixotropy nangaphantsi kweqondo lokushisa le-gel. Lo mhlaba unenzuzo enkulu kuhlengahlengiso lomgangatho kunye nokuncipha kulwakhiwo lodaka lwesakhiwo. Kufuneka kucaciswe apha ukuba i-viscosity ephezulu ye-ether ye-cellulose, ngcono ukugcinwa kwamanzi, kodwa ukuphakama kwe-viscosity, ukuphakama kwe-molecular weight ye-cellulose ether, kunye nokuncipha okuhambelanayo kwi-solubility yayo, enefuthe elibi. kugxininiso lodaka kunye nokusebenza kolwakhiwo. Ukuphakama kwe-viscosity, kuyabonakala ngakumbi umphumo wokuqina kumdaka, kodwa awulingani ngokupheleleyo. Enye i-viscosity ephakathi kunye nephantsi, kodwa i-ether ye-cellulose eguqulwayo inomsebenzi ongcono ekuphuculeni amandla okwakhiwa kodaka olumanzi. Ngokunyuka kwe-viscosity, ukugcinwa kwamanzi kwe-cellulose ether kuphucula.
Ixesha lokuposa: Feb-28-2023