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 zokuthatha indawo yeVegan 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-ether ye-cellulose inika udaka olumanzi kunye ne-viscosity egqwesileyo, enokunyusa kakhulu amandla okudibanisa phakathi kodaka olumanzi kunye nomgangatho wesiseko, kunye nokuphucula ukusebenza kokuchasana nodaka.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 lunokusebenza 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 ezinamanzi ze-methyl cellulose zihlala zine-pseudoplastic kunye ne-non-thixotropic fluidity ngaphantsi kobushushu bejeli yayo, 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.I-concentration ephezulu 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