Amaqela e-hydroxyl avuliwei-cellulose etheriimolekyuli kunye ne-athomu ye-oksijini kwiibhondi ze-ether ziya kwenza iibhondi ze-hydrogen kunye neemolekyuli zamanzi, ukuguqula amanzi akhululekile kumanzi adibeneyo, ngaloo ndlela edlala indima efanelekileyo ekugcineni amanzi; ukusasazwa okulinganayo phakathi kweeamolekyu zamanzi kunye ne-cellulose ether i-molecular chain ivumela iimolekyuli zamanzi ukuba zingene ngaphakathi kwe-cellulose ether macromolecular chain kwaye zixhomekeke kwizithintelo ezinamandla, ngaloo ndlela zenza amanzi akhululekile kunye namanzi adibeneyo, okuphucula ukugcinwa kwamanzi kwi-slurry ye-samente; i-cellulose ether iphucula iipropati ze-rheological, isakhiwo senethiwekhi ye-porous kunye noxinzelelo lwe-osmotic ye-slurry entsha ye-samente okanye i-film-forming properties ye-cellulose ether ithintela ukusasazwa kwamanzi.
Ukugcinwa kwamanzi kwe-cellulose ether ngokwayo kuvela kwi-solubility kunye nokuphelelwa ngamanzi kwe-cellulose ether ngokwayo. Umthamo we-hydration wamaqela e-hydroxyl iyodwa akwanelanga ukuhlawula iibhondi ze-hydrogen ezomeleleyo kunye ne-van der Waals imikhosi phakathi kwee-molecule, ngoko idumba kuphela kodwa ayinyibiliki emanzini. Xa i-substituents zingeniswa kwitsheyina le-molecular, kungekhona nje ukuba abathintekayo batshabalalise amatyathanga e-hydrogen, kodwa kunye neebhondi ze-hydrogen ze-interchain zitshatyalaliswa ngenxa yokudityaniswa kwe-substituents phakathi kwamatyathanga akufutshane. Inkulu i-substituents, umgama omkhulu phakathi kwee-molecule, kunye nefuthe elikhulu lokutshabalalisa iibhondi ze-hydrogen. Emva kokuba i-cellulose lattice idumbile, isisombululo singena, kwaye i-cellulose ether iba yi-soluble yamanzi, yenza isisombululo esiphezulu se-viscosity, esidlala indima yokugcina amanzi.
Izinto ezichaphazela ukusebenza kogcino lwamanzi:
I-Viscosity: Okukhona i-viscosity ye-cellulose ether, ngcono ukugcinwa kwamanzi, kodwa iphezulu i-viscosity, iphezulu ubunzima bemolekyuli ye-cellulose ether, kunye nokunyibilika kwayo kuncipha ngokufanelekileyo, okunempembelelo embi ekugxininiseni kunye nokusebenza kolwakhiwo. yodaka. Ngokuqhelekileyo, kwimveliso efanayo, iziphumo ze-viscosity ezilinganiswe ngeendlela ezahlukeneyo zihluke kakhulu, ngoko ke xa kuthelekiswa ne-viscosity, kufuneka iqhutywe phakathi kweendlela zokuvavanya okufanayo (kubandakanya ukushisa, i-rotor, njl.).
Imali eyongeziweyo: Okukhona ubuninzi be-ether ye-cellulose eyongeziweyo kudaka, ngcono ukusebenza kokugcinwa kwamanzi. Ngesiqhelo, isixa esincinci se-cellulose ether inokuphucula kakhulu izinga lokugcinwa kwamanzi odaka. Xa isixa sifikelela kwinqanaba elithile, indlela yokunyusa izinga lokugcinwa kwamanzi iyancipha.
I-particle fineness: Okukhona amasuntswana acolekileyo, kokukhona agcina amanzi ngcono. Xa amasuntswana amakhulu e-cellulose ether edibana namanzi, umphezulu uyanyibilika ngokukhawuleza kwaye wenze ijeli ukusonga izinto ukuthintela iimolekyuli zamanzi ukuba zingaqhubeki nokungena. Ngamanye amaxesha, nokuvuselela ixesha elide akukwazi ukuphumeza ukusasazwa okufanayo kunye nokutshatyalaliswa, ukwenza isisombululo se-flocculent esine-turbid okanye i-agglomeration, echaphazela kakhulu ukugcinwa kwamanzi kwe-cellulose ether. Ukunyibilika ngomnye wemiba yokukhetha i-cellulose ether. Ukulunga kukwasisalathisi somsebenzi obalulekileyo we-methyl cellulose ether. Ukulunga kuchaphazela ukunyibilika kwe-methyl cellulose ether. I-Coarser MC idla ngokuba yigranular kwaye inokunyibilika ngokulula emanzini ngaphandle kwe-agglomeration, kodwa izinga lokuchithwa licotha kakhulu kwaye alifanelekanga ukusetyenziswa kudaka olomileyo.
Ubushushu: Njengoko ubushushu be-ambient bukhuphuka, ukugcinwa kwamanzi kwi-cellulose ethers ngokuqhelekileyo kuyancipha, kodwa ezinye ii-ether ze-cellulose ezilungisiweyo nazo zinokugcinwa kakuhle kwamanzi phantsi kweemeko eziphezulu zokushisa; xa iqondo lokushisa liphakama, i-hydration ye-polymers iyancipha, kwaye amanzi phakathi kwamakhonkco ayakhutshwa. Xa i-dehydration yanele, iimolekyuli ziqala ukudibanisa ukuze zenze ijeli yesakhiwo sothungelwano lwe-dimensional.
Ubume bemolekyuli: I-ethers ye-cellulose ene-substitution ephantsi inokugcinwa kwamanzi okungcono.
Ukutyeba kunye ne-thixotropy
Ukutyebisa:
Impembelelo kubuchule bokudibanisa kunye nokusebenza okuchasayo: I-ethers ye-cellulose inika udaka olumanzi i-viscosity egqwesileyo, enokunyusa kakhulu amandla okudibanisa udaka olumanzi kunye nomaleko wesiseko kunye nokuphucula ukusebenza kodaka. Isetyenziswa ngokubanzi kudaka lokutyabeka, udaka lwe-tile bonding kunye nenkqubo yokugquma eludongeni lwangaphandle 3.
Impembelelo kwi-homogeneity yezinto: Isiphumo esityebileyo se-cellulose ethers sinokunyusa amandla okulwa nokusasazeka kunye ne-homogeneity yezinto ezixubeneyo ezisanda kuxubana, ukuthintela ukucwangciswa kwezinto, ulwahlulo kunye ne-sepage yamanzi, kwaye ingasetyenziselwa kwikhonkrithi yefiber, ikhonkrithi engaphantsi kwamanzi kunye ne-self-compacting concrete. .
Umthombo kunye nempembelelo yesiphumo sokuqina: Isiphumo sokutyeba se-cellulose ether kwizinto ezisekwe kwisamente zivela kwi-viscosity yesisombululo se-cellulose ether. Ngaphantsi kweemeko ezifanayo, ukuphakama kwe-viscosity ye-cellulose ether, ngcono i-viscosity yezinto eziguquliweyo zesamente, kodwa ukuba i-viscosity iphezulu kakhulu, iya kuchaphazela umbane kunye nokusebenza kwezinto (ezifana nokuncamathela kwimela yokutyabeka. ). I-self-leveling mortar kunye ne-self-compacting concrete kunye neemfuno eziphezulu ze-fluidity zifuna i-viscosity ephantsi kakhulu ye-cellulose ether. Ukongezelela, umphumo wokuqina we-cellulose ether uya kwandisa imfuno yamanzi yezinto ezisekelwe kwi-samente kunye nokwandisa ukuveliswa kodaka.
Thixotropy:
I-high-viscosity cellulose ether isisombululo samanzi sine-thixotropy ephezulu, ekwayimpawu enkulu ye-cellulose ether. Isisombululo se-aqueous se-methyl cellulose sihlala sine-pseudoplasticity kunye ne-non-thixotropic fluidity ngaphantsi kweqondo lobushushu bejeli, kodwa sibonisa iipropati zokuhamba kwe-Newtonian kumazinga aphantsi okucheba. I-Pseudoplasticity iyanda ngokunyuka kwe-cellulose ether ye-molecular weight okanye i-concentration, kwaye ayinanto yakwenza nohlobo lwe-substitute kunye ne-degree of substitution. Ngoko ke, i-cellulose ethers yebakala elifanayo le-viscosity, nokuba i-MC, i-HPMC, okanye i-HEMC, ihlala ibonisa iimpawu ezifanayo ze-rheological nje ukuba ugxininiso kunye nobushushu buhlala buhlala. Xa iqondo lokushisa liphakama, i-gel yesakhiwo yenziwa, kwaye ukuhamba okuphezulu kwe-thixotropic kwenzeka. I-cellulose ethers ene-concentration ephezulu kunye ne-viscosity ephantsi ibonisa i-thixotropy nangaphantsi kweqondo lokushisa le-gel. Lo mhlaba uluncedo kakhulu ekuhlengahlengiseni ukulinganisa kunye nokudilika kodaka lwesakhiwo ngexesha lokwakha.
Ukungena emoyeni
Umgaqo kunye nefuthe ekusebenzeni kokusebenza: I-ether ye-cellulose inefuthe elibalulekileyo lokungenisa umoya kwizinto ezintsha ezisekelwe kwi-samente. I-cellulose ether inamaqela amabini e-hydrophilic (amaqela e-hydroxyl, amaqela e-ether) kunye namaqela e-hydrophobic (amaqela e-methyl, amakhonkco e-glucose). Yinto esebenza phezu komhlaba, ngoko ke inefuthe lokungenisa umoya. Umphumo wokungena komoya uya kuvelisa umphumo webhola, unokuphucula ukusebenza kwezinto ezixutywe ngokutsha, ezifana nokwandisa iplastiki kunye nokuguquguquka kodaka ngexesha lokusebenza, okunenzuzo ekusasazeni udaka; iya kwandisa imveliso yodaka kwaye inciphise ixabiso lemveliso yodaka.
Impembelelo kwiipropati zomatshini: Impembelelo yokungenisa umoya iya kwandisa i-porosity yezinto eziqiniweyo kwaye inciphise iimpawu zayo zomatshini ezifana namandla kunye ne-elastic modulus.
Impembelelo kwi-fluidity: Njenge-surfactant, i-ether ye-cellulose nayo inomanzi okanye i-lubricating impembelelo kumasuntswana e-samente, ethi kunye nefuthe layo lokungena emoyeni linyusa ubuninzi bezinto ezisekelwe kwi-samente, kodwa umphumo wayo wokuqina uya kunciphisa umbane. Umphumo we-cellulose ether kwi-fluidity yezinto ezisekelwe kwi-samente yindibaniselwano yeplastiki kunye nemiphumo yokuqina. Ngokuqhelekileyo, xa idosi ye-cellulose ether iphantsi kakhulu, ibonakala ngokubonakalayo njengeplastiki okanye imiphumo yokunciphisa amanzi; xa idosi iphezulu, isiphumo esityebileyo se-cellulose ether sikhula ngokukhawuleza, kwaye umphumo wayo wokungenisa umoya udla ngokugcwala, ngoko ke ubonakalisa njengokutyeba okanye ukwanda kwemfuno yamanzi.
Ixesha lokuposa: Dec-23-2024