Isenzakalo sokwehla kwe-viscosity ngesikhathi sokugcina upende kuyinkinga evamile, ikakhulukazi ngemva kokugcinwa isikhathi eside, i-viscosity yopende iyancipha kakhulu, ithinta ukusebenza kokwakhiwa kanye nekhwalithi yomkhiqizo. Ukuncipha kwe-viscosity kuhlobene nezici eziningi, njengezinga lokushisa, umswakama, ukuvuthwa kwe-solvent, ukuwohloka kwe-polymer, njll., kodwa ukusebenzisana ne-thickener cellulose ether kubaluleke kakhulu.
1. Indima eyisisekelo ye-cellulose ether
I-Cellulose ether iyi-thickener evamile esetshenziswa kakhulu kumapende asekelwe emanzini. Imisebenzi yabo eyinhloko ihlanganisa:
Ukuqina komphumela: I-Cellulose ether ingakha isakhiwo senethiwekhi esinezinhlangothi ezintathu esivuvukele ngokumunca amanzi, ngaleyo ndlela ikhulise i-viscosity yesistimu futhi ithuthukise ukusebenza kwe-thixotropy nokusebenza kokwakhiwa kopende.
Umphumela wokusimamisa ukumiswa: I-Cellulose ether ingavimbela ngempumelelo ukuthungwa kwezinhlayiya eziqinile njenge-pigments nama-filler kupende futhi igcine ukufana kopende.
Isakhiwo sokwenza ifilimu: I-Cellulose ether ingase futhi ithinte impahla kapende eyenza ifilimu, yenze ukunamathela kube nokuqina nokuqina okuthile.
Kunezinhlobo eziningi zama-cellulose ethers, okuhlanganisa i-methyl cellulose (MC), i-hydroxyethyl cellulose (HEC), i-hydroxypropyl methyl cellulose (HPMC), njll. Lezi zinto zinokuncibilika okuhlukile, ikhono lokujiya kanye nokumelana nokugcinwa kwezingubo.
2. Izizathu eziyinhloko zokunciphisa i-viscosity
Ngesikhathi sokugcinwa kwezindwangu, ukunciphisa i-viscosity kubangelwa ikakhulukazi yizizathu ezilandelayo:
(1) Ukuwohloka kwe-cellulose ethers
Ukuqina komphumela we-cellulose ethers ezimbotsheni kuncike kusayizi wesisindo samangqamuzana awo kanye nobuqotho besakhiwo samangqamuzana awo. Ngesikhathi sokugcina, izici ezifana nezinga lokushisa, i-asidi kanye ne-alkalinity, nama-microorganisms angabangela ukuwohloka kwe-cellulose ethers. Isibonelo, ngesikhathi sokugcina isikhathi eside, izakhi ze-acidic noma ze-alkali ekugqokeni zingase zifake i-hydrolyze uchungechunge lwamangqamuzana e-cellulose ether, lunciphise isisindo samangqamuzana, futhi ngaleyo ndlela lunciphise umphumela walo wokujiya, okuholela ekunciphiseni kwe-viscosity.
(2) I-solvent volatilization kanye nokufuduka komswakama
Ukushintshashintsha kwe-solvent noma ukufuduka komswakamo ku-coating kungase kuthinte isimo sokunyibilika se-cellulose ether. Ngesikhathi sokugcina, ingxenye yamanzi ingase ihwamuke noma ifudukele endaweni enamathelayo, okwenza ukusatshalaliswa kwamanzi ku-coating kungalingani, ngaleyo ndlela kuthinte izinga lokuvuvukala kwe-cellulose ether futhi kubangele ukuncipha kwe-viscosity ezindaweni zendawo.
(3) Ukuhlasela kwamagciwane
Ukukhula kwe-microbial kungase kwenzeke ekugqokeni lapho kugcinwe ngendlela engafanele noma ama-preservatives angasebenzi. Ama-microorganisms angakwazi ukubola ama-cellulose ethers nezinye izingqimba eziphilayo, zenze buthaka umphumela wazo wokujiya futhi enze i-viscosity ye-coating yehle. Izindwangu ezisekelwe emanzini, ikakhulukazi, ziyindawo enhle yokukhula kwe-microbial ngoba iqukethe inani elikhulu lamanzi.
(4) Izinga lokushisa eliphezulu ukuguga
Ngaphansi kwezimo zokugcinwa kwezinga lokushisa eliphezulu, ukwakheka komzimba noma kwamakhemikhali eketango lamangqamuzana e-cellulose ether kungase kushintshe. Isibonelo, ama-cellulose ether athambekele ekubeni ne-oxidation noma i-pyrolysis emazingeni okushisa aphakeme, okuholela ekubeni buthakathaka komphumela wokujiya. Amazinga okushisa aphezulu abuye asheshise ukuvuvuka kwe-solvent kanye nokuhwamuka kwamanzi, kuphinde kuthinte ukuqina kwe-viscosity.
3. Izindlela zokuthuthukisa ukuzinza kwesitoreji sezingubo
Ukuze kuncishiswe ukwehla kwe-viscosity ngesikhathi sokugcina futhi kunwetshwe impilo yokugcina ye-coating, izinyathelo ezilandelayo zingathathwa:
(1) Ukukhetha i-cellulose ether efanele
Izinhlobo ezahlukene ze-cellulose ethers zinokusebenza okuhlukile mayelana nokuzinza kwesitoreji. Ama-cellulose ether anesisindo samangqamuzana aphezulu ngokuvamile anemiphumela engcono yokujiya, kodwa ukuzinza kwawo kwesitoreji kubi kakhulu, kuyilapho ama-cellulose ether anesisindo esiphansi samangqamuzana angase abe nokusebenza okungcono kokugcinwa. Ngakho-ke, lapho uklama ifomula, kufanele kukhethwe ama-ether e-cellulose anokusimama okuhle kwesitoreji, noma ama-cellulose ether kufanele ahlanganiswe namanye ama-thickeners ukuze kuthuthukiswe ukumelana kwawo nesitoreji.
(2) Lawula i-pH yokunamathela
I-acidity kanye ne-alkalinity yesistimu yokumboza kunethonya elibalulekile ekuzinzeni kwama-cellulose ethers. Ekwakhiweni kokwakheka, inani le-pH lokumboza kufanele lilawulwe ukuze kugwenywe indawo ene-asidi ngokweqile noma ene-alkali ukuze kwehliswe ukuwohloka kwama-ether e-cellulose. Ngasikhathi sinye, ukwengeza inani elifanelekile lesilungisi se-pH noma i-buffer kungasiza ukuzinzisa i-pH yohlelo.
(3) Ukwandisa ukusetshenziswa kwezivimbelakuvunda
Ukuze uvimbele ukuguguleka kwe-microbial, inani elifanele lezinto ezilondolozayo kufanele zengezwe ekunambeni. Ama-preservatives angavimbela ukukhula kwama-microorganisms, ngaleyo ndlela avimbele izinto eziphilayo ezifana ne-cellulose ether ukuthi zingaboli futhi zigcine ukuqina kwe-coating. Ama-preservatives afanelekile kufanele akhethwe ngokuvumelana nokwakhiwa kwe-coating kanye nemvelo yokugcina, futhi ukusebenza kwawo kufanele kuhlolwe njalo.
(4) Lawula indawo yokugcina impahla
Ukushisa kwesitoreji kanye nomswakama we-coating kunomthelela oqondile ekuzinzeni kwe-viscosity. Ukugqoka kufanele kugcinwe endaweni eyomile nepholile, kugwenywe izinga lokushisa eliphezulu kanye nezimo zomswakama ophezulu ukuze kuncishiswe ukuvuthwa kwe-solvent kanye nokuwohloka kwe-cellulose ether. Ngaphezu kwalokho, ukupakishwa okuvalwe kahle kunganciphisa ngempumelelo ukufuduka nokuhwamuka kwamanzi futhi kubambezele ukwehla kwe-viscosity.
4. Ezinye izici ezithinta i-viscosity
Ngaphezu kwama-cellulose ethers, ezinye izakhi ohlelweni lokumboza zingase zithinte ushintsho ku-viscosity. Isibonelo, uhlobo nokugxila kwezingulube, izinga lokuvuvukala kwezincibilikisi, kanye nokuhambisana kwamanye ama-thickeners noma ama-dispersants kungase kuthinte ukuzinza kwe-viscosity ye-coating. Ngakho-ke, ukuklama okuphelele kwefomula yokugqoka kanye nokuxhumana phakathi kwezingxenye nakho kungamaphuzu abalulekile okudingeka anakwe.
Ukuncipha kwe-viscosity ngesikhathi sokugcinwa kwe-coating kuhlobene eduze nezici ezifana nokuwohloka kwama-cellulose ethers, ukuvuthwa kwe-solvent, nokufuduka kwamanzi. Ukuze kuthuthukiswe ukuzinza kokugcinwa kwento enamathelayo, kufanele kukhethwe izinhlobo ezifanele ze-cellulose ether, i-pH yokunamathela kufanele ilawulwe, izinyathelo zokulwa nokugqwala kufanele ziqiniswe, futhi indawo yokugcina kufanele yenziwe ibe ngcono. Ngokuklanywa kwefomula okunengqondo nokuphathwa kahle kwesitoreji, inkinga yokuncipha kwe-viscosity ngesikhathi sokugcinwa kwento enamathelayo ingancishiswa ngempumelelo, futhi ukusebenza komkhiqizo nokuncintisana kwemakethe kungathuthukiswa.
Isikhathi sokuthumela: Sep-27-2024