Ukwehla kwe-viscosity ngesikhathi sokugcina upende kuyinkinga evamile, ikakhulukazi ngemva kokugcinwa isikhathi eside, i-viscosity yopende iyancipha kakhulu, okuthinta ukusebenza kokwakhiwa kanye nekhwalithi yomkhiqizo. Ukwehla kwe-viscosity kuhlobene nezici eziningi, njengokushisa, umswakama, ukuguquguquka kwe-solvent, ukuwohloka kwe-polymer, njll., kodwa ukusebenzisana ne-thickener cellulose ether kubaluleke kakhulu.
1. Indima eyisisekelo ye-cellulose ether
I-Cellulose ether iyisithako esivame ukusetshenziswa kakhulu kumapende asekelwe emanzini. Imisebenzi yawo eyinhloko ihlanganisa:
Umphumela wokujiya: I-cellulose ether ingakha isakhiwo senethiwekhi esinezinhlangothi ezintathu esivuvukele ngokumunca amanzi, ngaleyo ndlela yandise ukujiya kwesistimu futhi ithuthukise ukusebenza kwe-thixotropy kanye nokwakhiwa kopende.
Umphumela wokuzinza kokumiswa: I-cellulose ether ingavimbela ngempumelelo ukuthuthwa kwezinhlayiya eziqinile njengezinhlayiya kanye nezigcwalisi kupende futhi igcine ukufana kopende.
Impahla yokwakha ifilimu: I-cellulose ether ingathinta nempahla yokwakha ifilimu yopende, okwenza isembozo sibe nokuqina nokuqina okuthile.
Kunezinhlobo eziningi zama-ether e-cellulose, okuhlanganisa i-methyl cellulose (MC), i-hydroxyethyl cellulose (HEC), i-hydroxypropyl methyl cellulose (HPMC), njll. Lezi zinto zinokuncibilika okuhlukile, ikhono lokujiya kanye nokumelana nokugcina ezimbozweni.
2. Izizathu eziyinhloko zokunciphisa i-viscosity
Ngesikhathi sokugcina izembozo, ukwehla kwe-viscosity kubangelwa kakhulu yizizathu ezilandelayo:
(1) Ukuwohloka kwama-ether e-cellulose
Umphumela wokujiya kwama-ether e-cellulose ezimbozweni uncike ngobukhulu besisindo sawo sama-molecule kanye nobuqotho besakhiwo sawo sama-molecule. Ngesikhathi sokugcina, izici ezifana nokushisa, i-acidity kanye ne-alkalinity, kanye nama-microorganisms kungabangela ukuwohloka kwama-ether e-cellulose. Isibonelo, ngesikhathi sokugcina isikhathi eside, izingxenye ze-acidic noma ze-alkaline ezimbozweni zingase zifake i-hydrolyze uchungechunge lwama-molecule lwe-ether ye-cellulose, zinciphise isisindo sawo sama-molecule, futhi ngaleyo ndlela zenze buthaka umphumela walo wokujiya, okuholela ekunciphiseni kwe-viscosity.
(2) Ukuguquguquka kwe-solvent kanye nokufuduka komswakama
Ukuguquguquka kwe-solvent noma ukufuduka komswakama ephepheni kungathinta isimo sokuncibilika kwe-cellulose ether. Ngesikhathi sokugcina, ingxenye yamanzi ingahwamuka noma ithuthele ebusweni bephepheni, okwenza ukusatshalaliswa kwamanzi ephepheni kungalingani, ngaleyo ndlela kuthinte izinga lokuvuvukala kwe-cellulose ether futhi kubangele ukwehla kwe-viscosity ezindaweni zasendaweni.
(3) Ukuhlaselwa yi-microbial
Ukukhula kwama-microbial kungenzeka embozweni uma ugcinwe ngendlela engafanele noma izilondolozi zingasasebenzi. Ama-microorganism angabolisa ama-cellulose ethers kanye nezinye izinto eziqinisa izinto eziphilayo, okwenza buthaka umphumela wawo wokujiya futhi kubangele ukuthi i-viscosity yembozwe yehle. Ama-coating asekelwe emanzini, ikakhulukazi, ayindawo enhle yokukhula kwama-microbial ngoba aqukethe amanzi amaningi.
(4) Ukuguga kwezinga lokushisa eliphezulu
Ngaphansi kwezimo zokugcina izinga lokushisa eliphezulu, isakhiwo somzimba noma samakhemikhali se-cellulose ether molecular chain singashintsha. Isibonelo, ama-cellulose ethers athambekele ekufakweni kwe-oxidation noma i-pyrolysis emazingeni okushisa aphezulu, okuholela ekubeni buthaka komphumela wokujiya. Amazinga okushisa aphezulu nawo asheshisa ukuguquguquka kwe-solvent kanye nokuhwamuka kwamanzi, okuthinta kakhulu ukuzinza kwe-viscosity.
3. Izindlela zokuthuthukisa ukuzinza kokugcinwa kwezimbozo
Ukuze kuncishiswe ukwehla kwe-viscosity ngesikhathi sokugcina futhi kwandiswe impilo yokugcina yengubo, izinyathelo ezilandelayo zingathathwa:
(1) Ukukhetha i-cellulose ether efanele
Izinhlobo ezahlukene zama-ether e-cellulose zisebenza ngendlela ehlukile ngokuya ngokuqina kwesitoreji. Ama-ether e-cellulose anesisindo esikhulu sama-molecule ngokuvamile anemiphumela engcono yokuqina, kodwa ukuqina kwawo kwesitoreji kuphansi kakhulu, kuyilapho ama-ether e-cellulose anesisindo esincane sama-molecule angase abe nokusebenza okungcono kwesitoreji. Ngakho-ke, lapho kuklanywa ifomula, ama-ether e-cellulose anokuqina okuhle kwesitoreji kufanele akhethwe, noma ama-ether e-cellulose kufanele ahlanganiswe nezinye izithisi ukuze kuthuthukiswe ukumelana kwawo nesitoreji.
(2) Lawula i-pH yengubo
I-acidity kanye ne-alkalinity yesistimu yokumboza inethonya elibalulekile ekuzinzeni kwama-cellulose ethers. Ekwakhiweni kokwakheka, inani le-pH lengubo kufanele lilawulwe ukuze kugwenywe indawo ene-acidic noma i-alkaline eningi kakhulu ukuze kuncishiswe ukuwohloka kwama-cellulose ethers. Ngesikhathi esifanayo, ukwengeza inani elifanele le-adjuster noma i-buffer ye-pH kungasiza ekuzinziseni i-pH yesistimu.
(3) Khulisa ukusetshenziswa kwezithako zokulondoloza
Ukuze kuvinjelwe ukuguguleka kwamagciwane, kufanele kwengezwe inani elifanele lezilondolozi ephepheni. Izilondolozi zingavimbela ukukhula kwamagciwane, ngaleyo ndlela zivimbele izinto eziphilayo ezifana ne-cellulose ether ukuthi zibole futhi zigcine ukuqina kwephepheni. Izilondolozi ezifanele kufanele zikhethwe ngokuya ngesimo sephepheni nendawo yokugcina, futhi ukusebenza kwazo kufanele kuhlolwe njalo.
(4) Lawula indawo yokugcina izinto
Izinga lokushisa lokugcina kanye nomswakama wengubo kunomthelela oqondile ekuqineni kwe-viscosity. Ingubo kufanele igcinwe endaweni eyomile nepholile, kugwenywe izimo zokushisa okuphezulu kanye nomswakama ophezulu ukuze kuncishiswe ukuguquguquka kwe-solvent kanye nokuwohloka kwe-cellulose ether. Ngaphezu kwalokho, ukupakisha okuvalwe kahle kunganciphisa ngempumelelo ukufuduka kanye nokuhwamuka kwamanzi futhi kubambezele ukwehla kwe-viscosity.
4. Ezinye izinto ezithinta ukujiya
Ngaphezu kwama-cellulose ether, ezinye izingxenye ohlelweni lokumboza nazo zingathinta ushintsho ekuqineni. Isibonelo, uhlobo kanye nokuhlushwa kwama-pigment, izinga lokuwohloka kwezinyibilikisi, kanye nokuhambisana nezinye izinto ezijiyile noma ezihlakazayo kungathinta ukuzinza kwe-viscosity kwengubo. Ngakho-ke, ukwakheka okuphelele kwefomula yokumboza kanye nokusebenzisana phakathi kwezingxenye nakho kungamaphuzu abalulekile okudingeka anakwe.
Ukwehla kwe-viscosity ngesikhathi sokugcina i-coating kuhlobene kakhulu nezici ezifana nokuwohloka kwe-cellulose ethers, ukuguquguquka kwe-solvent, kanye nokufuduka kwamanzi. Ukuze kuthuthukiswe ukuzinza kwe-coating ye-coating, izinhlobo ezifanele ze-cellulose ether kufanele zikhethwe, i-pH ye-coating kufanele ilawulwe, izinyathelo zokulwa nokugqwala kufanele ziqiniswe, futhi indawo yokugcina kufanele yenziwe ngcono. Ngokuklanywa kwefomula efanele kanye nokuphathwa okuhle kwe-storage, inkinga yokwehla kwe-viscosity ngesikhathi sokugcina i-coating ingancishiswa ngempumelelo, futhi ukusebenza komkhiqizo kanye nokuncintisana kwemakethe kungathuthukiswa.
Isikhathi sokuthunyelwe: Septhemba-27-2024