Amaqembu e-hydroxyl avuliwei-cellulose etherama-athomu nama-athomu e-oksijini kumabhondi e-ether azokwakha izibopho ze-hydrogen nama-molecule wamanzi, aphendule amanzi mahhala abe amanzi aboshwe, ngaleyo ndlela adlale indima enhle ekugcineni amanzi; ukuhlukana phakathi kwama-molecule amanzi kanye namaketanga e-cellulose ether amangqamuzana kuvumela ama-molecule amanzi ukuthi angene ngaphakathi kweketango le-cellulose ether macromolecular futhi abe ngaphansi kwezingqinamba ezinamandla, ngaleyo ndlela akhe amanzi amahhala kanye namanzi abanjwe, okuthuthukisa ukugcinwa kwamanzi kwe-slurry kasimende; i-cellulose ether ithuthukisa izakhiwo ze-rheological, ukwakheka kwenethiwekhi enezimbotshana kanye nengcindezi ye-osmotic ye-slurry entsha kasimende noma izakhiwo zefilimu ze-cellulose ether zivimbela ukusakazeka kwamanzi.
Ukugcinwa kwamanzi kwe-cellulose ether ngokwayo kuvela ekuncibilikeni nasekuphelelweni kwamanzi emzimbeni kwe-cellulose ether ngokwayo. Umthamo we-hydration wamaqembu e-hydroxyl ewodwa awanele ukukhokhela amabhondi e-hydrogen aqinile namandla e-van der Waals phakathi kwama-molecule, ngakho ayakhukhumala kuphela kodwa awancibiliki emanzini. Lapho okufakwe esikhundleni sethulwa ochungechungeni lwamangqamuzana, akugcini nje ngokubhubhisa amaketanga e-hydrogen, kodwa futhi namabhondi e-hydrogen e-interchain ayabhujiswa ngenxa yokugaxana kwababambeli phakathi kwamaketanga aseduze. Uma ama-substituents emakhulu, ibanga elikhulu phakathi kwama-molecule, kanye nomphumela wokucekela phansi izibopho ze-hydrogen. Ngemva kokuvuvukala kwe-cellulose lattice, isisombululo singena, futhi i-cellulose ether iba yi-soluble emanzini, yakha isixazululo se-viscosity ephezulu, esidlala indima ekugcineni amanzi.
Izinto ezithinta ukusebenza kokugcinwa kwamanzi:
I-Viscosity: Lapho i-viscosity ye-cellulose ether iba nkulu, kuba ngcono ukusebenza kokugcinwa kwamanzi, kodwa lapho i-viscosity iphakama, iyanda isisindo se-molecule ye-cellulose ether, futhi ukuncibilika kwayo kuncipha ngokufanele, okunomthelela omubi ekugxiliseni nasekusebenzeni kokwakhiwa. lodaka. Ngokuvamile, kumkhiqizo ofanayo, imiphumela ye-viscosity elinganiswa ngezindlela ezihlukene ihluke kakhulu, ngakho-ke uma uqhathanisa i-viscosity, kufanele yenziwe phakathi kwezindlela zokuhlola ezifanayo (okuhlanganisa izinga lokushisa, i-rotor, njll.).
Inani elingeziwe: Uma likhulu inani le-cellulose ether engezwe odakeni, kuba ngcono ukusebenza kokugcinwa kwamanzi. Ngokuvamile, inani elincane le-cellulose ether lingathuthukisa kakhulu izinga lokugcinwa kwamanzi odaka. Uma inani lifinyelela izinga elithile, inkambiso yokwenyuka kwezinga lokugcinwa kwamanzi iyancipha.
Ubucwebe bezinhlayiya: Uma izinhlayiya zicoleka, kuba ngcono ukugcina amanzi. Lapho izinhlayiya ezinkulu ze-cellulose ether zihlangana namanzi, indawo engaphezulu iyancibilika ngokushesha futhi yakhe ijeli ukuze igoqe into ukuvimbela ama-molecule amanzi ukuthi angaqhubeki nokungena. Kwesinye isikhathi, ngisho nokunyakazisa isikhathi eside akukwazi ukuzuza ukuhlakazeka okufanayo kanye nokuhlakazeka, kwakha isixazululo se-turbid flocculent noma i-agglomeration, okuthinta kakhulu ukugcinwa kwamanzi kwe-cellulose ether. Ukunyibilika kungenye yezici zokukhetha i-cellulose ether. Ubuhle buphinde bube yinkomba yokusebenza ebalulekile ye-methyl cellulose ether. Ubuhle buthinta ukunyibilika kwe-methyl cellulose ether. I-Coarser MC ivamise ukuba yimbudumbudu futhi ingancibilika kalula emanzini ngaphandle kokuhlanganiswa, kodwa izinga lokuncibilika lihamba kancane futhi alifanele ukusetshenziswa odakeni olomile.
Izinga lokushisa: Njengoba izinga lokushisa lendawo likhuphuka, ukugcinwa kwamanzi kwama-cellulose ethers ngokuvamile kuyehla, kodwa amanye ama-cellulose ether ashintshiwe nawo anokugcinwa kwamanzi okuhle ngaphansi kwezimo zokushisa eziphezulu; lapho izinga lokushisa likhuphuka, i-hydration yama-polymers iyancipha, futhi amanzi phakathi kwamaketanga ayaxoshwa. Lapho ukuphelelwa amanzi emzimbeni kwanele, ama-molecule aqala ukuhlangana ukuze akhe ijeli yesakhiwo senethiwekhi enezinhlangothi ezintathu.
Ukwakheka kwamangqamuzana: Ama-cellulose ether anokushintshwa okuphansi anokugcinwa kwamanzi okungcono.
Ukuqina kanye ne-thixotropy
Ukuqina:
Umthelela ekhonweni lokubopha kanye nokusebenza okuvimbela ukucwila: Ama-cellulose ether anikeza udaka olumanzi ukubukeka okuhle kakhulu, okungakhuphula kakhulu amandla okubopha odaka olumanzi ngesendlalelo esiyisisekelo futhi athuthukise ukusebenza kodaka lokunganciphisi. Isetshenziswa kakhulu ku-plastering mortar, udaka lwe-tile bonding kanye nohlelo lokufakwa kodonga lwangaphandle 3.
Umthelela ku-homogeneity yezinto ezibonakalayo: Ukuqina komphumela we-cellulose ethers futhi kungakhuphula ikhono lokulwa nokuhlakazeka kanye ne-homogeneity yezinto ezisanda kuxutshwa, kuvimbele ukuhlukaniswa kwezinto, ukuhlukaniswa kanye nokuphuma kwamanzi, futhi kungasetshenziswa kukhonkolo yefayibha, ukhonkolo ongaphansi kwamanzi kanye nokhonkolo ozihlanganisayo. .
Umthombo kanye nomthelela womphumela wokujiya: Umphumela wokujiya we-cellulose ether ezintweni ezisekelwe kusimende uvela ku-viscosity yesisombululo se-cellulose ether. Ngaphansi kwezimo ezifanayo, ukuphakama kwe-viscosity ye-cellulose ether, kuba ngcono i-viscosity yezinto ezisekelwe kusimende eziguquliwe, kodwa uma i-viscosity iphezulu kakhulu, izophazamisa uketshezi nokusebenza kwempahla (njengokunamathela kummese wokuplasta. ). Udaka oluzilinganisa kanye nokhonkolo ozihlanganisayo onezidingo zoketshezi oluphezulu kudinga i-viscosity ephansi kakhulu ye-cellulose ether. Ukwengeza, umphumela wokuqina we-cellulose ether uzophinde ukhulise isidingo samanzi sezinto ezisekelwe kusimende futhi ukwandise ukukhishwa kodaka.
Thixotropy:
Isixazululo samanzi se-cellulose ether se-high-viscosity sine-thixotropy ephezulu, okubuye kube isici esikhulu se-cellulose ether. Isixazululo esinamanzi se-methyl cellulose ngokuvamile sine-pseudoplasticity kanye ne-non-thixotropic fluidity ngaphansi kwezinga lokushisa lejeli, kodwa sibonisa izakhiwo zokugeleza kwe-Newtonian ngamanani aphansi e-shear. I-Pseudoplasticity iyanda ngokunyuka kwesisindo se-cellulose ether noma ukugxilisa ingqondo, futhi ayihlanganise lutho nohlobo lwe-substitute kanye nezinga lokushintsha. Ngakho-ke, ama-cellulose ethers webanga elifanayo le-viscosity, kungakhathaliseki ukuthi i-MC, i-HPMC, noma i-HEMC, ahlala ebonisa izici ezifanayo ze-rheological inqobo nje uma ukugxila nokushisa kuhlala njalo. Lapho izinga lokushisa likhuphuka, i-gel yesakhiwo iyakhiwa, futhi ukugeleza okuphezulu kwe-thixotropic kwenzeka. Ama-cellulose ether ane-concentration ephezulu kanye ne-viscosity ephansi abonisa i-thixotropy ngisho nangaphansi kwezinga lokushisa lejeli. Lesi sakhiwo sinenzuzo enkulu ekulungiseni izinga kanye nokuncipha kodaka lokwakha ngesikhathi sokwakha.
Ukungena emoyeni
Isimiso kanye nomthelela ekusebenzeni kokusebenza: I-Cellulose ether inomphumela obalulekile wokufaka umoya ezintweni ezintsha ezisekelwe kusimende. I-cellulose ether inawo womabili amaqembu e-hydrophilic (amaqembu e-hydroxyl, amaqembu e-ether) namaqembu e-hydrophobic (amaqembu e-methyl, izindandatho ze-glucose). Kuyi-surfactant enomsebenzi ongaphezulu, ngaleyo ndlela ibe nomthelela wokungena komoya. Umphumela wokungena emoyeni uzoveza umphumela webhola, ongathuthukisa ukusebenza kokusebenza kwezinto ezisanda kuhlanganiswa, njengokwandisa ipulasitiki kanye nokushelela kodaka ngesikhathi sokusebenza, okuzuzisa ukusabalalisa udaka; kuzophinde kwenyuse ukukhiqizwa kukadaka futhi kunciphise izindleko zokukhiqiza udaka.
Umthelela ezicini zemishini: Umphumela wokungena komoya uzokhuphula i-porosity yento eqinile futhi unciphise izakhiwo zayo zemishini njengamandla kanye ne-elastic modulus.
Umthelela ku-fluidity: Njenge-surfactant, i-cellulose ether iphinde ibe nomthelela wokumanzisa noma wokugcoba ezinhlayiyeni zikasimende, okuthi kanye nomthelela wawo wokufaka umoya kukhuphule uketshezi lwezinto ezisekelwe kusimende, kodwa umphumela wawo wokujiya uzonciphisa uketshezi. Umthelela we-cellulose ether ku-fluidity yezinto ezisekelwe kusimende inhlanganisela ye-plasticizing kanye nemiphumela yokuqina. Ngokuvamile, lapho umthamo we-cellulose ether uphansi kakhulu, ubonakala ngokuyinhloko njenge-plasticizing noma imiphumela yokunciphisa amanzi; lapho umthamo uphakeme, umphumela wokujiya we-cellulose ether ukhula ngokushesha, futhi umphumela wawo wokungenisa umoya uvame ukugcwala, ngakho ubonakala njengokuqina noma ukwanda kwesidingo samanzi.
Isikhathi sokuthumela: Dec-23-2024