I-HPMC (Hydroxypropyl Methylcellulose) iyinhlanganisela ye-polymer encibilika emanzini etholwe ngokuguqulwa kwamakhemikhali kwe-cellulose yemvelo. Isetshenziswa kakhulu emkhakheni wamapende nezingubo ngenxa yokuqina kwayo okuhle, ukuqiniswa, nokugcinwa kwamanzi. I-HPMC ingathuthukisa kakhulu i-rheology, ukuzinza, nokusebenza kokwakhiwa kwe-coating, iqinisekise ukuthi i-coating inokusebenza okuzinzile ngesikhathi sokugcinwa, ukuthutha, nokwakhiwa, kanye nokuthola ifilimu yokugqoka iyunifomu.
(1) Izakhiwo eziyisisekelo ze-HPMC
I-HPMC i-non-ionic cellulose ether enezici ezilandelayo:
Ukuqina komphumela: I-HPMC ingakha isixazululo se-viscous kokubili emanzini nasezincibilikilweni eziphilayo, ezingakhuphula ngempumelelo i-viscosity yento enamathelayo, ngaleyo ndlela ikhulise ukusebenza kwesembozo sokumboza nokushuba kokumboza.
Umthelela wokugcina amanzi: I-HPMC inamandla okugcina amanzi amahle kakhulu futhi inganqanda ukuhwamuka okusheshayo kwamanzi okunamathelayo. Ifaneleka ngokukhethekile ukugqoka okusekelwe emanzini okudingeka kusetshenziswe endaweni eyomile.
Isakhiwo sokwenza ifilimu: I-HPMC, njengosizo lokwenza ifilimu, ingasiza i-coating yenze ifilimu yokunamathela ebushelelezi futhi efanayo ngesikhathi senqubo yokumisa, ithuthukise ukubukeka nokucaba kwefilimu yokumboza.
Ukuhambisana: I-HPMC inokusimama okuhle kwamakhemikhali nokuhambisana nezinhlobonhlobo zezithako zokubunjwa, futhi ifanele izinhlobo ezihlukahlukene zokwakheka kokumboza.
(2) Imisebenzi esemqoka ye-HPMC kumapende kanye nama-coatings
1. Ukuqina
Ekwakheni upende nokwemboza, i-HPMC, njengenye ye-thickeners eyinhloko, isiza ukulungisa i-rheology (okungukuthi, i-fluidity kanye nokukhubazeka) kwengubo ngokushintsha i-viscosity yayo. Izakhiwo ezinhle ze-rheological zingavimbela ukunamathela ekuzinziseni ngesikhathi sokugcina futhi kugcine uketshezi olufanele nokusebenza kokugqoka ngesikhathi sokwakhiwa.
Umphumela wokuqina unemiphumela ehlukene ezinhlotsheni ezihlukene zokumboza. Emigqeni esekelwe emanzini, i-HPMC inyusa i-viscosity ye-coating, ikwenze kube lula ukuyisebenzisa nokusabalalisa ngokulinganayo phezulu, igweme ukugoqa. Emigqeni esekelwe ku-solvent, i-HPMC iphinde isize ukulungisa i-viscosity futhi inikeze i-thixotropy efanelekile (into enamathelayo iyajiya uma ishiywe imile futhi izacile lapho inyakaziswa noma isetshenziswa).
2. I-ejenti yokugcina amanzi
Umphumela wokugcina amanzi we-HPMC ubaluleke kakhulu, ikakhulukazi kumapende asekelwe emanzini. Ingakwazi ukuvimbela ngokuphumelelayo amanzi kupende ukuthi ahwamuke ngokushesha phakathi nenqubo yokwakha, ngaleyo ndlela iqinisekise ukuthi ukugqoka kunesikhathi esanele sokulinganisa nokwenza ifilimu yokugqoka ebushelelezi futhi efanayo. Ngaphansi kwezimo zokushisa ezomile noma eziphakeme, ukuhwamuka kwamanzi kupende ngokushesha kungabangela ukuqhekeka kwefilimu yokumboza noma indawo engalingani. I-HPMC inganciphisa kakhulu le nqubo.
I-HPMC ingasiza futhi ama-pigments nama-filler kupende ukuthi ahlale ehlakazekile ngokulinganayo phakathi nenqubo yokwakha, ivimbele ukomiswa kwendawo noma ukuhlangana kwezinhlayiyana, ngaleyo ndlela iqinisekise ubuhle nokufana kwefilimu yokuhlanganisa.
3. I-ejenti yokulinganisa kanye nomphumela wokulwa nokuncipha
Njenge-ejenti yokulinganisa, i-HPMC ingavimbela upende ukuthi unganciphisi noma ugxumeke phakathi nenqubo yokomisa upende. Ngenxa yezakhiwo zayo ezikhethekile ze-rheological, i-HPMC inganikeza uketshezi oluhle ngesikhathi sokwakhiwa kokumboza, okuvumela upende ukuthi usakazwe ngokulinganayo ebusweni be-substrate. Ngemva kokumisa ukusebenza, i-viscosity kapende ilulama kancane kancane ukuvimbela ukugeleza ngokweqile kanye nokwakheka kwamamaki ahlehlayo.
Lesi sici sibaluleke kakhulu ekupendeni kwe-facade noma kwezinye izikhathi lapho isicelo esiqondile sidingeka khona. Ukwengezwa kwe-HPMC kuqinisekisa ukuthi upende uthola ngokushesha ukuhlangana okufanele ngemva kokufaka isicelo, ukuze uhlale endaweni osetshenziswa kuyo, futhi ungagelezi ubheke phansi ngenxa yamandla adonsela phansi.
4. Umphumela ohlakazekayo
I-HPMC, njenge-dispersant, ingathuthukisa ukuhlakazeka kwezimibalabala kanye nezigcwalisi kupende. Ngokwenza ngcono ukuhlakazeka kwama-pigments nama-fillers, i-HPMC ingaqinisekisa ukuthi izinhlayiya eziqinile kupende zihlala zihlakazekile, zigweme ukuhlanganiswa kanye ne-sedimentation, futhi ngaleyo ndlela zithuthukise ukufana nokuzinza kwe-coating. Lokhu kubalulekile ukuhambisana kombala kanye nezakhiwo zemishini zokugqoka.
5. Usizo lokwenza amafilimu
Phakathi nenqubo yokwenza ifilimu kapende, i-HPMC ingasetshenziswa futhi njengosizo lokwenza ifilimu ukusiza ukwakha ukumbozwa okufanayo. Lesi sici sibalulekile ekuthuthukiseni izinga eliphezulu le-coating. Phakathi nenqubo yokomisa, i-HPMC iqinisekisa ukuthi upende ungomisa ngokulinganayo ebusweni nangaphakathi ngokulungisa izinga lokuhwamuka kwamanzi, lenze ukunamathela okuyisicaba nokushelelayo. Ikakhulukazi kumapende acwebezelayo namapende okuhlobisa, indima ye-HPMC yenza i-coating ibe nokubukeka okungcono.
(3) Izinzuzo zokusebenzisa i-HPMC
1. Thuthukisa ukusebenza kokwakhiwa kwe-coating
Umphumela we-rheological regulation we-HPMC wenza ukunamathela kube lula ukusebenza ngesikhathi sokufaka isicelo, futhi ukusebenza kokwakhiwa kuthuthukiswa kakhulu. Ukugqoka ngeke kugeleze ngokweqile noma kukhiqize izimpawu zokuxubha, ukugqoka kufana kakhulu, futhi ifilimu yokugqoka eyakhiwe ngemva kokwakhiwa ibushelelezi futhi ilula.
2. Thuthukisa ukuzinza kwesitoreji se-coating
I-HPMC ingavimbela ukuhlukaniswa kanye ne-sedimentation ye-coating ngesikhathi sokugcina, futhi igcine ukufana nokuzinza kwe-coating. Imiphumela yayo yokuqina nokuhlakazeka ingagcina ngempumelelo ama-pigments nama-fillers embozweni esimweni esihlakazekile ngokulinganayo, sandise impilo yokugcina yokugqoka.
3. Thuthukisa ukusebenza kwe-anti-cracking yefilimu yokugqoka
Umphumela wokugcinwa kwamanzi we-HPMC uqinisekisa ukuthi amanzi e-coating angakwazi ukuhwamuka kancane kancane phakathi nenqubo yokomisa, futhi ifilimu yokugcoba ngeke iqhekeke ngenxa yokumisa ngokushesha lapho kwakhiwa, ngaleyo ndlela ithuthukise ikhwalithi yonke kanye nokuqina kwefilimu yokugqoka.
4. Ukuzivumelanisa nezimo ezihlukahlukene zemvelo
Njengoba i-HPMC inokuguquguquka okunamandla ekushintsheni kwezinga lokushisa nomswakama, ifaneleka ukwakhiwa kokumboza ngaphansi kwezimo ezihlukahlukene zemvelo, ikakhulukazi ezindaweni ezishisayo nezinomswakama ophansi. I-HPMC ingathuthukisa ngempumelelo ukugcinwa kwamanzi kwento enamathelayo futhi ivimbele ukoma ukuthi ukoma ngokushesha okukhulu.
(4) Ukusetshenziswa kwe-HPMC ezinhlotsheni ezihlukene zokumboza
Izembatho ezisekelwe emanzini: I-HPMC isetshenziselwa ikakhulukazi ukuqina, ukugcinwa kwamanzi kanye nokulungiswa kwezinga ekugqokeni okusekelwe emanzini. Ingathuthukisa ukusebenza kokwakhiwa kwezingubo ezisekelwe emanzini, ikakhulukazi uma isetshenziswe endaweni eyomisa ngokushesha, ingathuthukisa kakhulu umthamo wokugcinwa kwamanzi we-coating.
Izembatho zezakhiwo: Ezingxenyeni zezakhiwo, i-HPMC iqinisekisa ukuvikelwa kwesikhathi eside kodonga noma izindawo zesakhiwo ngokuthuthukisa ukumelana nokuqhekeka nokuqina kokunamathela. Izembatho zezakhiwo ngokuvamile zidinga ukusebenza okuphezulu kokwakhiwa kanye nokumelana nesimo sezulu, futhi i-HPMC ingasiza ukuthuthukisa lezi zakhiwo.
Izingubo ezicwebezelayo eziphakeme: Izingubo ezicwebezelayo eziphezulu zinezidingo eziphakeme zokushibilika kwendawo nokushelela. Umthelela wokulinganisa kanye nempahla yokwenza ifilimu ye-HPMC ingathuthukisa ngokuphawulekayo ikhwalithi yokubukeka kwe-coating, iyenze ikhanye futhi ibe bushelelezi.
I-HPMC idlala izindima eziningi kupende kanye nama-coatings, okuhlanganisa ukuqina, ukugcinwa kwamanzi, ukubeka izinga, ukuhlakazeka kanye nokwakhiwa kwefilimu. Akukwazi nje ukuthuthukisa ukusebenza kokwakhiwa kokugqoka, kodwa futhi kuthuthukise ikhwalithi nokuqina kwefilimu yokugqoka. Ngakho-ke, i-HPMC isetshenziswa kabanzi ekwakhiweni kwe-coating yesimanje futhi iyisengezo esibalulekile sokuqinisekisa ukusebenza kanye nekhwalithi yezingubo.
Isikhathi sokuthumela: Oct-11-2024