Amaqembu e-hydroxyl kui-cellulose etherAma-molecule kanye nama-athomu e-oxygen kuma-ether bonds azokwakha izibopho ze-hydrogen nama-molecule amanzi, aguqule amanzi akhululekile abe amanzi aboshwe, ngaleyo ndlela adlale indima enhle ekugcinweni kwamanzi; ukusabalala okuhambisanayo phakathi kwama-molecule amanzi nama-cellulose ether molecular chain kuvumela ama-molecule amanzi ukuthi angene ngaphakathi kwe-cellulose ether macromolecular chain futhi abhekane nemingcele eqinile, ngaleyo ndlela akhe amanzi akhululekile namanzi aboshwe, okuthuthukisa ukugcinwa kwamanzi kwe-cement slurry; i-cellulose ether ithuthukisa izakhiwo ze-rheological, isakhiwo senethiwekhi evuvukalayo kanye nengcindezi ye-osmotic ye-cement slurry entsha noma izakhiwo zokwakha ifilimu ze-cellulose ether zivimbela ukusabalala kwamanzi.
Ukugcinwa kwamanzi kwe-cellulose ether uqobo kuvela ekuncibilikeni nasekuphelelweni kwamanzi kwe-cellulose ether uqobo. Amandla okumanzisa amanzi amaqembu e-hydroxyl kuphela awanele ukukhokhela izibopho ze-hydrogen ezinamandla kanye namandla e-van der Waals phakathi kwama-molecule, ngakho-ke ayakhukhumala kuphela kodwa awancibiliki emanzini. Lapho izinto ezithathelwanayo zifakwa kuchungechunge lwama-molecule, izinto ezithathelwanayo azibhubhisi nje kuphela izintambo ze-hydrogen, kodwa futhi nezibopho ze-hydrogen ezihlanganayo ziyabhujiswa ngenxa yokuhlangana kwezinto ezithathanwayo phakathi kwamaketanga aseduze. Lapho izinto ezithathanwayo zikhulu, ibanga eliphakathi kwama-molecule likhulu, futhi umphumela wokubhubhisa izibopho ze-hydrogen uba mkhulu. Ngemva kokuba i-cellulose lattice ikhukhumala, isixazululo siyangena, bese i-cellulose ether iba yincibilikayo emanzini, yakha isixazululo esinobukhulu obuphezulu, esibe sesidlala indima ekugcinweni kwamanzi.
Izici ezithinta ukusebenza kokugcinwa kwamanzi:
Ukuqina: Uma i-viscosity ye-cellulose ether inkulu, ukusebenza kokugcinwa kwamanzi kuba ngcono, kodwa uma i-viscosity iphakeme, isisindo sama-molecule se-cellulose ether siphakeme, futhi ukuncibilika kwayo kwehla ngokufanele, okunomthelela omubi ekugxilweni nasekusebenzeni kokwakhiwa kwe-mortar. Ngokuvamile, kumkhiqizo ofanayo, imiphumela ye-viscosity elinganiswa ngezindlela ezahlukene ihlukile kakhulu, ngakho-ke uma kuqhathaniswa i-viscosity, kumele yenziwe phakathi kwezindlela zokuhlola ezifanayo (kufaka phakathi izinga lokushisa, i-rotor, njll.).
Inani lokwengeza: Uma inani elikhulu le-cellulose ether elifakwe ku-mortar, kulapho ukusebenza kokugcinwa kwamanzi kuba ngcono khona. Ngokuvamile, inani elincane le-cellulose ether lingathuthukisa kakhulu izinga lokugcinwa kwamanzi ku-mortar. Lapho inani lifika ezingeni elithile, umkhuba wokwandisa izinga lokugcinwa kwamanzi uyehla.
Ubucwebe bezinhlayiya: Uma izinhlayiya zincane, kuba ngcono ukugcinwa kwamanzi. Lapho izinhlayiya ezinkulu ze-cellulose ether zihlangana namanzi, ubuso buyancibilika ngokushesha bese kwakha ijeli yokusonga izinto ukuze kuvinjelwe ama-molecule amanzi ukuthi angaqhubeki nokungena. Ngezinye izikhathi, ngisho nokuxuba isikhathi eside akukwazi ukufeza ukuhlakazeka nokuncibilika okufanayo, kwakha isisombululo se-flocculent esinamafu noma i-agglomeration, okuthinta kakhulu ukugcinwa kwamanzi kwe-cellulose ether. Ukuncibilika kungenye yezinto ezibangela ukukhetha i-cellulose ether. Ubucwebe futhi buyisibonakaliso esibalulekile sokusebenza kwe-methyl cellulose ether. Ubucwebe buthinta ukuncibilika kwe-methyl cellulose ether. I-Coarser MC ivame ukuba yi-granular futhi ingancibilika kalula emanzini ngaphandle kokuhlanganiswa, kodwa izinga lokuncibilika lihamba kancane kakhulu futhi alifanele ukusetshenziswa ku-mortar eyomile.
Izinga Lokushisa: Njengoba izinga lokushisa elizungezile likhuphuka, ukugcinwa kwamanzi kwama-cellulose ethers kuvame ukwehla, kodwa amanye ama-cellulose ethers aguquliwe nawo anokugcinwa kwamanzi okuhle ngaphansi kwezimo zokushisa eziphakeme; lapho izinga lokushisa likhuphuka, umswakama wama-polymers uba buthaka, futhi amanzi phakathi kwamaketanga ayakhishwa. Lapho ukuphelelwa amanzi emzimbeni kwanele, ama-molecule aqala ukuhlangana ukuze akhe ijeli yesakhiwo senethiwekhi enezinhlangothi ezintathu.
Isakhiwo sama-molecule: Ama-ether e-cellulose anokufakwa esikhundleni okuphansi anokugcinwa kwamanzi okungcono.
Ukuqina kanye ne-thixotropy
Ukuqina:
Umphumela ekhonweni lokubopha kanye nokusebenza kokulwa nokugoba: Ama-cellulose ether anikeza udaka olumanzi i-viscosity enhle kakhulu, okungakhulisa kakhulu ikhono lokubopha udaka olumanzi ngesendlalelo sesisekelo futhi kuthuthukise ukusebenza kokulwa nokugoba kodaka. Isetshenziswa kabanzi ekuplasteni udaka, udaka lokubopha amathayela kanye nohlelo lokuvikela udonga lwangaphandle 3.
Umphumela ekulinganeni kwezinto: Umphumela wokujiya kwama-ether e-cellulose ungandisa nekhono lokulwa nokuhlakazeka kanye nokulingana kwezinto ezisanda kuhlanganiswa, uvimbele ukuhlukaniswa kwezinto, ukuhlukaniswa kanye nokuphuma kwamanzi, futhi ungasetshenziswa kukhonkolo yefayibha, kukhonkolo engaphansi kwamanzi kanye nakonkolonkolo oyazicindezelayo.
Umthombo kanye nethonya lomphumela wokujiya: Umphumela wokujiya we-cellulose ether ezintweni ezisekelwe kusimende uvela ekujiya kwesisombululo se-cellulose ether. Ngaphansi kwezimo ezifanayo, lapho i-viscosity ye-cellulose ether iphakeme, i-viscosity yezinto ezisekelwe kusimende eziguquliwe iba ngcono, kodwa uma i-viscosity iphezulu kakhulu, izothinta ukujiya nokusebenza kwezinto (njengokunamathela kummese wokuplasta). I-mortar ezilinganisayo kanye ne-concrete ezizihlanganisayo enezidingo eziphezulu zokujiya kudinga i-viscosity ephansi kakhulu ye-cellulose ether. Ngaphezu kwalokho, umphumela wokujiya we-cellulose ether uzokwandisa nesidingo samanzi sezinto ezisekelwe kusimende futhi wandise umkhiqizo we-mortar.
I-Thixotropy:
Isixazululo samanzi se-cellulose ether esine-viscosity ephezulu sine-thixotropy ephezulu, okuyisici esiyinhloko se-cellulose ether. Isixazululo samanzi se-methyl cellulose ngokuvamile sine-pseudoplasticity kanye ne-non-thixotropic fluidity ngaphansi kokushisa kwejeli yaso, kodwa sibonisa izakhiwo zokugeleza kwe-Newtonian ngamanani aphansi okushefa. I-pseudoplasticity iyanda ngokwanda kwesisindo sama-molecule e-cellulose ether noma ukuhlushwa, futhi ayihlobene nhlobo nohlobo lwe-substituent kanye nezinga lokushintsha. Ngakho-ke, ama-cellulose ethers ebanga elifanayo le-viscosity, kungaba yi-MC, i-HPMC, noma i-HEMC, ahlala ebonisa izakhiwo ezifanayo ze-rheological inqobo nje uma ukuhlushwa kanye nokushisa kuhlala kungaguquki. Lapho izinga lokushisa likhuphuka, kwakheka ijeli yesakhiwo, bese kwenzeka ukugeleza okuphezulu kwe-thixotropic. Ama-cellulose ethers anokuhlushwa okuphezulu kanye ne-viscosity ephansi abonisa i-thixotropy ngisho nangaphansi kokushisa kwejeli. Le mpahla iwusizo kakhulu ekulungiseni ukuleveli kanye nokugoba kwe-mortar yokwakha ngesikhathi sokwakha.
Ukungena emoyeni
Isimiso kanye nomphumela ekusebenzeni kahle: I-Cellulose ether inomphumela obalulekile wokungenisa umoya ezintweni ezintsha ezisekelwe kusimende. I-Cellulose ether inamaqembu athanda amanzi (amaqembu e-hydroxyl, amaqembu e-ether) kanye namaqembu athanda amanzi (amaqembu e-methyl, amasongo e-glucose). Iyi-surfactant enomsebenzi wobuso, ngaleyo ndlela inomphumela wokungenisa umoya. Umphumela wokungenisa umoya uzokhiqiza umphumela webhola, ongathuthukisa ukusebenza kokusebenza kwezinto ezisanda kuhlanganiswa, njengokwandisa i-plasticity kanye nokushelela kwe-mortar ngesikhathi sokusebenza, okuzuzisa ekusakazeni i-mortar; kuzophinde kwandise umkhiqizo we-mortar futhi kunciphise izindleko zokukhiqiza i-mortar.
Umphumela ezimpahleni zomshini: Umphumela wokungena komoya uzokwandisa ukubhoboka kwezinto eziqinile futhi wehlise izakhiwo zazo zomshini ezifana namandla kanye ne-elastic modulus.
Umphumela ekugelezeni: Njenge-surfactant, i-cellulose ether nayo inomphumela wokumanzisa noma wokugcoba ezinhlayiyeni zesimende, okuthi kanye nomphumela wayo wokungenisa umoya kwandisa ukugeleza kwezinto ezisekelwe kusimende, kodwa umphumela wayo wokujiya uzonciphisa ukugeleza. Umphumela we-cellulose ether ekugelezeni kwezinto ezisekelwe kusimende uyinhlanganisela yemiphumela yokwenza ipulasitiki kanye nokuqina. Ngokuvamile, lapho umthamo we-cellulose ether uphansi kakhulu, ubonakala kakhulu njengemiphumela yokwenza ipulasitiki noma yokunciphisa amanzi; lapho umthamo uphezulu, umphumela wokujiya we-cellulose ether uyanda ngokushesha, futhi umphumela wayo wokungenisa umoya uvame ukugcwala, ngakho-ke ubonakala njengokuqina noma ukwanda kwesidingo samanzi.
Isikhathi sokuthunyelwe: Disemba 23-2024