IHydroxyethyl Cellulose (HEC) iyinhlanganisela evamile ye-polymer engeyona i-ionic encibilika emanzini enokuqina okuhle kakhulu, ukugcinwa kwamanzi, kanye nezakhiwo zokwakha ifilimu. Ngakho-ke, isetshenziswa kakhulu ekugcokeni, kumapende e-latex, namaglue. Izinamatheliso nezinye izimboni. Ipende ye-latex iyingxenye ebalulekile yezinto zokuhlobisa izakhiwo zesimanje, futhi ukungezwa kwe-HEC akukwazi nje ukuthuthukisa ukuzinza kwepende ye-latex, kodwa futhi kuthuthukise ukusebenza kwayo kokwakhiwa.
1. Izici eziyisisekelo ze-hydroxyethyl cellulose
I-Hydroxyethyl cellulose iyi-polymer encibilika emanzini etholwe ngokuguqulwa kwamakhemikhali kusetshenziswa i-cellulose yemvelo njengempahla eluhlaza. Izici zayo eziyinhloko zihlanganisa:
Ukuqina: I-HEC inomphumela omuhle wokuqina, ongakhuphula kakhulu i-viscosity kapende we-latex futhi unikeze upende we-latex omuhle kakhulu we-thixotropy kanye ne-rheology, ngaleyo ndlela yakhe umfaniswano kanye ne-coating eminyene ngesikhathi sokwakhiwa.
Ukugcinwa kwamanzi: I-HEC ingavimbela ngokuphumelelayo amanzi ukuthi angahwamuki ngokushesha kakhulu kupende, ngaleyo ndlela yelule isikhathi sokuvula sikapende we-latex futhi ithuthukise izakhiwo zokumisa nokwenza ifilimu zefilimu kapende.
Ukuzinza: I-HEC inokusimama okuhle kakhulu kwamakhemikhali ekwenziweni kopende kwe-latex, ingamelana nemiphumela yezinguquko ze-pH, futhi ayinakho ukusabela okungekuhle kwezinye izithako kupende (njengama-pigments nama-filler).
Ukulinganisa: Ngokulungisa inani le-HEC, i-fluidity kanye nokulingana kopende we-latex kungathuthukiswa, futhi izinkinga ezifana nokucwila kanye nezimpawu zokuxubha kufilimu kapende zingagwenywa.
Ukubekezelela usawoti: I-HEC inokubekezelela okuthile kuma-electrolyte, ngakho-ke isengakwazi ukugcina ukusebenza kahle ekuhlanganiseni okuqukethe usawoti noma amanye ama-electrolyte.
2. Indlela yokusebenza ye-hydroxyethyl cellulose kupende we-latex
Njenge-thickener ne-stabilizer, indlela eyinhloko yokusebenza kwe-hydroxyethyl cellulose kupende we-latex ingahlaziywa kulezi zici ezilandelayo:
(1) Ukuqina komphumela
I-HEC incibilika ngokushesha emanzini futhi yakha isisombululo esicacile, esibonakalayo. Ngokwenza izibopho ze-hydrogen nama-molecule amanzi, ama-molecule e-HEC avuleka futhi andise i-viscosity yesisombululo. Ngokulungisa inani le-HEC, i-viscosity yepende ye-latex ingalawulwa ngokunembile ukuze kuzuzwe ukusebenza okuhle kokwakha. Umphumela wokuqina we-HEC uhlobene nesisindo sayo samangqamuzana. Ngokuvamile, ukuphakama kwesisindo samangqamuzana, umphumela wokujiya ubaluleke kakhulu.
(2) Umphumela wokuzinzisa
Kunenani elikhulu lama-emulsion, ama-pigments kanye nama-filler kupende we-latex, futhi ukuxhumana phakathi kwalezi zingxenye kungase kwenzeke, okuholela ekuqothulweni noma ekunameni kwepende ye-latex. Njenge-colloid evikelayo, i-HEC ingakha uhlelo oluzinzile lwe-sol esigabeni samanzi ukuvimbela ama-pigments nama-fillers ekuxazululeni. Ukwengeza, i-HEC inokumelana okuhle nezinguquko ekushiseni nasekuqineni kwe-shear, ngakho-ke ingaqinisekisa ukuzinza kopende we-latex ngesikhathi sokugcina nokwakhiwa.
(3) Thuthukisa ukwakheka
Ukusebenza kwesicelo sopende we-latex kuncike kakhulu ezintweni zayo ze-rheological. Ngokuqina nokuthuthukisa i-rheology, i-HEC ingathuthukisa ukusebenza kwe-anti-sag yepende ye-latex, ivumele ukuthi isakaze ngokulinganayo ezindaweni eziqondile futhi ikwenze kube lula ukugeleza. Ngesikhathi esifanayo, i-HEC ingaphinde yandise isikhathi sokuvula upende we-latex, inikeze abasebenzi bezokwakha isikhathi esengeziwe sokwenza izinguquko nokunciphisa amamaki ebhulashi namamaki okugeleza.
3. Indlela yokwengeza i-hydroxyethyl cellulose kupende we-latex
Ukuze usebenzise ngokugcwele umphumela we-hydroxyethyl cellulose, indlela yokwengeza efanele ibalulekile. Ngokuvamile, ukusetshenziswa kwe-HEC kupende we-latex kufaka phakathi lezi zinyathelo ezilandelayo:
(1) Ngaphambi kokuhlakazwa
Njengoba i-HEC incibilika kancane emanzini futhi ijwayele ukunqwabelana, kuvame ukutuswa ukuthi i-HEC ihlakaze kuqala emanzini ukuze kwakhiwe isixazululo se-colloidal esifanayo ngaphambi kokusetshenziswa. Lapho incibilika, i-HEC kufanele yengezwe kancane futhi inyakaziswa ngokuqhubekayo ukuze kuvinjwe i-agglomeration. Ukulawula izinga lokushisa kwamanzi ngesikhathi senqubo yokuchithwa nakho kubaluleke kakhulu. Ngokuvamile kunconywa ukwenza ukuchithwa ekushiseni kwe-20-30 ° C ukuze kugwenywe ukushisa kwamanzi ngokweqile okuthinta ukwakheka kwamangqamuzana e-HEC.
(2) Engeza ukuhleleka
Enqubweni yokukhiqiza upende we-latex, i-HEC ivame ukungezwa ngesikhathi se-pulping stage. Lapho ulungiselela upende we-latex, ama-pigments kanye nama-fillers aqala ukuhlakazwa esigabeni samanzi ukuze enze i-slurry, bese isixazululo se-HEC se-colloidal sengezwa ngesikhathi sesiteji sokuhlakazeka ukuze kuqinisekiswe ukuthi singasatshalaliswa ngokulinganayo kulo lonke uhlelo. Isikhathi sokwengeza i-HEC kanye nokuqina kokunyakazisa kuzothinta umphumela wayo wokuqina, ngakho-ke idinga ukulungiswa ngokuya ngezidingo zenqubo ethile ekukhiqizeni kwangempela.
(3) Ukulawula umthamo
Inani le-HEC linomthelela oqondile ekusebenzeni kopende we-latex. Ngokuvamile, inani elingeziwe le-HEC lingu-0.1% -0.5% yenani eliphelele lopende we-latex. I-HEC encane kakhulu izobangela ukuthi umphumela wokuqina ungabi nalutho futhi upende we-latex ube uketshezi kakhulu, kuyilapho i-HEC eningi kakhulu izobangela ukuba i-viscosity ibe phezulu kakhulu, ithinte ukusebenza. Ngakho-ke, ekusetshenzisweni okungokoqobo, umthamo we-HEC udinga ukulungiswa ngokunengqondo ngokuya ngefomula ethile kanye nezidingo zokwakha zopende we-latex.
4. Izibonelo zokusetshenziswa kwe-hydroxyethyl cellulose kupende we-latex
Ekukhiqizeni kwangempela, i-HEC isetshenziswe kabanzi ezinhlotsheni ezihlukahlukene zamapende e-latex, njengalezi:
Upende ongaphakathi odongeni lwe-latex: Izakhiwo ezijiyayo nezigcina amanzi ze-HEC ziyenza ikwazi ukuthuthukisa ngokuphawulekayo izici zokulevelisa nokunqanda ukunyakaza kwefilimu kapende kupende ongaphakathi odongeni lwe-latex, ikakhulukazi ezindaweni ezinezinga lokushisa eliphezulu lapho isengakwazi ukulondoloza ukusebenza okuhle kakhulu.
Upende wangaphandle we-latex odongeni: Ukuzinza nokumelana nosawoti we-HEC kuyivumela ukuthi ithuthukise isimo sezulu nokumelana nokuguga kupende wangaphandle we-latex odongeni futhi inwebe impilo yesevisi yefilimu kapende.
Upende we-latex we-anti-mildew: I-HEC ingahlakaza ngempumelelo i-anti-mildew kupende we-latex we-latex futhi ithuthukise ukufana kwayo kufilimu kapende, ngaleyo ndlela ithuthukise umphumela wokulwa nesikhutha.
Njengesengezo esihle kakhulu sikapende we-latex, i-hydroxyethyl cellulose ingathuthukisa kakhulu ukusebenza kopende we-latex ngokujiya kwawo, ukugcinwa kwamanzi, kanye nemiphumela yokusimamisa. Ezisetshenziswa ezingokoqobo, ukubamba okunengqondo kwendlela yokwengeza kanye nemithamo ye-HEC kungathuthukisa kakhulu ukwakheka nokusebenzisa umphumela wopende we-latex.
Isikhathi sokuthumela: Oct-22-2024