Focus on Cellulose ethers

Indlela yokusebenza ye-methyl cellulose ether

Ekubunjweni kwe-powder mortar eyomile, i-methyl cellulose iyinani eliphansi lokuhlanganisa, kodwa linesengezo esibalulekile esingathuthukisa kakhulu ukuxuba nokusebenza kokwakhiwa kodaka. Ukukubeka kalula, cishe zonke izakhiwo ezimanzi zokuxuba zodaka ezingabonakala ngeso lenyama zinikezwa i-cellulose ether. Iphuma ku-cellulose etholwe kusetshenziswa i-cellulose evela kukhuni nokotini, isabela nge-caustic soda, futhi iyifake etherifying nge-ejenti e-etherifying.

Izinhlobo ze-Methyl Cellulose Ether
A. IHydroxypropyl methylcellulose (HPMC) yenziwe ikakhulukazi ukotini ocwenge kakhulu ocwengekile njengempahla eluhlaza, efakwa etherified ngokukhethekile ngaphansi kwezimo ze-alkali.
B. IHydroxyethyl methyl cellulose (HEMC), i-non-ionic cellulose ether, iyimpushana emhlophe, ayinaphunga futhi ayinambitheki.
C. IHydroxyethylcellulose (HEC) iyi-surfactant engeyona i-ionic, imhlophe ngokubukeka, ayinaphunga futhi ayinambitheki futhi impushana egeleza kalula.
Okungenhla ama-non-ionic cellulose ethers, nama-ionic cellulose ethers (afana ne-carboxymethyl cellulose (CMC)).

Ngesikhathi sokusetshenziswa kwe-powder mortar eyomile, ngenxa yokuthi i-ionic cellulose (CMC) ayizinzile lapho kukhona ama-calcium ions, ayivamile ukusetshenziswa ezinhlelweni ze-inorganic gelling ezinosimende kanye ne-slaked lime njengezinto zokuhlanganisa. Kwezinye izindawo e-China, Amanye ama-putty angaphakathi odongeni acutshungulwa ngesitashi esishintshiwe njengesisetshenziswa esiyinhloko sikasimende kanye ne-Shuangfei powder njengesithako sokugcwalisa sisebenzisa i-CMC njengokuqina, kodwa ngenxa yokuthi lo mkhiqizo uthambekele ekubeni nesikhutha futhi awukwazi ukumelana namanzi, uyasuswa kancane kancane. ngasemakethe . Njengamanje, i-cellulose ether esetshenziswa kakhulu e-China yi-HPMC.

I-Cellulose ether isetshenziswa kakhulu njenge-ejenti yokugcina amanzi kanye ne-thickener ezintweni ezisekelwe kusimende.

Umsebenzi wayo wokugcina amanzi ungavimbela i-substrate ekumunceni amanzi amaningi ngokushesha futhi ivimbele ukuhwamuka kwamanzi, ukuze kuqinisekiswe ukuthi usimende unamanzi anele uma ufakwe amanzi. Thatha umsebenzi wokuplasta njengesibonelo. Lapho i-slurry ye-cement evamile isetshenziswa ebusweni be-substrate, i-substrate eyomile ne-porous izothatha ngokushesha inani elikhulu lamanzi kusuka ku-slurry, futhi ungqimba lwe-cement slurry oluseduze ne-substrate luzolahlekelwa kalula ukugeleza kwalo. Ngakho-ke, akukwazi nje kuphela ukwakha ijeli ye-samente enamandla okunamathela ebusweni be-substrate, kodwa futhi kubangele kalula i-warping kanye nokuphuma kwamanzi, ukuze ungqimba lukasimende olungaphezulu lwe-slurry lube lula ukuwa. Uma i-grout esetshenzisiwe incane, kulula futhi ukwakha imifantu kuyo yonke i-grout. Ngakho-ke, esikhathini esidlule sokuplasta kwendawo, isisekelo sasivame ukumanziswa ngamanzi kuqala, kodwa lokhu kusebenza kwakunzima futhi kudla isikhathi, futhi ikhwalithi yokusebenza kwakunzima ukuyilawula.

Ngokuvamile, ukugcinwa kwamanzi kodaka lukasimende kukhuphuka ngokwanda kokuqukethwe kwe-cellulose ether. Uma kukhulu i-viscosity ye-cellulose ether eyengeziwe, ukugcinwa kwamanzi kungcono.

Ngaphezu kokugcina amanzi kanye nokuqina, i-cellulose ether iphinda ithinte ezinye izakhiwo zikasimende, njengokuhlehlisa, ukufaka umoya, nokwandisa amandla ebhondi. I-Cellulose ether inciphisa ukumiswa kanye nenqubo yokuqina kukasimende, ngaleyo ndlela ikhulise isikhathi sokusebenza, ngakho ngezinye izikhathi isetshenziswa njengesilawuli esimisiwe.

Ngokuthuthukiswa kodaka oluxutshwe okomile, i-cellulose ether isibe ingxube ebalulekile yodaka lukasimende. Kodwa-ke, kunezinhlobo eziningi kanye nokucaciswa kwe-cellulose ether, futhi ikhwalithi phakathi kwamaqoqo isalokhu iguquguquka.

Kudingeka futhi ukunaka lapho usebenzisa:
1. Izici zokusebenza zodaka oluguquliwe zihlobene eduze nokuthuthukiswa kwe-viscosity ye-cellulose ether. Nakuba imikhiqizo ene-viscosity ephezulu ene-viscosity yokugcina ephezulu, ngenxa yokuqedwa kancane, kuthatha isikhathi eside ukuthola i-viscosity yokugcina; ngaphezu kwalokho, I-cellulose ether enezinhlayiya eziqinile ithatha isikhathi eside ukuze ithole i-viscosity yokugcina, ngakho umkhiqizo one-viscosity ephakeme awunazo izici zokusebenza ezingcono.
2. Ngenxa yomkhawulo wezinga le-polymerization yezinto zokusetshenziswa kwe-cellulose ether, i-viscosity ephezulu ye-cellulose ether nayo inomkhawulo.
3. Kuyadingeka ukuhlola ukuthengwa, inqubo yokukhiqiza kanye nokuhlolwa kwefekthri ukuze kugwenywe ukuguquguquka kwekhwalithi.


Isikhathi sokuthumela: Mar-29-2023
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