1. Okwu mmalite
Hydroxypropyl Methylcellulose (HPMC) bụ polymer soluble mmiri nke a na-ejikarị na mkpuchi, ihe ụlọ, ọgwụ na mpaghara ndị ọzọ. Na mkpuchi ụlọ ọrụ, HPMC bụghị nanị na-eji dị ka a thickener, stabilizer na film mbụ, kamakwa dị ka a ukwuu oru oma dispersant. Isi ọrụ ya na mkpuchi na-agụnye imeziwanye nkwụsi ike nke mkpuchi, meziwanye rheology, ịrụ ọrụ ihe owuwu na mma nke mkpuchi ikpeazụ.
2. Ọdịdị nke HPMC
Usoro ihe omimi nke HPMC nwere skeleton cellulose na hydroxypropyl na methyl substituents. Ọdịdị ya pụrụ iche na-enye HPMC solubility na mmiri na ike ịmepụta ihe ngwọta viscoelastic na ngwọta mmiri. HPMC na-emekọrịta ihe na ụmụ irighiri ihe mgbaze site na hydrogen bonding na ndị agha van der Waals, si otú a na-agbaze n'ime mmiri ma na-etolite usoro mgbasa ozi siri ike.
Arọ molikula na ogo nke nnọchi (DS) nke HPMC na-emetụta solubility na viscosity ya. N'ikwu okwu n'ozuzu, ịdị arọ molekụla dị elu na ogo nke nnọchi na-abawanye viscosity na oge mgbasa nke HPMC. Àgwà ndị a dị oké mkpa maka ọrụ nke HPMC dị ka mkpuchi mkpuchi.
3. Ọrụ HPMC na mkpuchi
3.1 Na-emeziwanye dispersibility pigmenti
A na-ejikarị HPMC eme ihe iji melite dispersibility nke pigmenti na mkpuchi. Na usoro mmepụta nke mkpuchi, agglomeration nke ihe ndị dị na pigmenti bụ nsogbu nkịtị, nke na-eduga na mkpuchi na-adịghị mma na nke na-adịghị akwụ ụgwọ, na-emetụta gloss na agba edo edo nke mkpuchi. Ndị na-ekesa HPMC na-ekere òkè n'akụkụ ndị a:
Electrostatic repulsion: The ngwọta kpụrụ HPMC dissolving na mmiri nwere elu elu ọrụ na ike adsorbed n'elu nke pigmenti irighiri iji mee ka ha ebubo. Nke a na-asọ oyi electrostatic na-ekewapụ ihe ndị dị na pigmenti na ibe ha ma na-ebelata agglomeration.
Mmetụta mgbochi Steric: yinye polymer nke HPMC nwere ike ịmepụta oyi akwa nchebe n'elu ihe ndị dị na pigmenti, mee ka oghere dị n'etiti ihe dị n'etiti ihe dị iche iche, ma si otú ahụ gbochie mmasị na agglomeration n'etiti ụmụ irighiri ihe.
Mmetụta nkwụsi ike: HPMC na-ejikọta ya na ụmụ irighiri mmiri site na njikọ hydrogen iji mepụta usoro ngwọta kwụsiri ike, gbochie ụmụ irighiri pigmenti na-edozi na usoro ahụ, ma melite nkwụsi ike nke mkpuchi.
3.2 Mmalite rheology
Ọrụ ọzọ dị mkpa nke HPMC bụ imeziwanye rheology nke mkpuchi, ya bụ, njiri na nrụrụ nke mkpuchi. Ezi rheological Njirimara nke mkpuchi na-enyere ya aka inwe ezigbo mgbasa ozi na ọkwa n'oge usoro ihe owuwu, na-emepụta ihe nkiri mkpuchi otu. HPMC na-emetụta njirimara rheological nke mkpuchi site na usoro ndị a:
Nkwalite Viscoelasticity: Ọdịdị netwọkụ polymer yinye nke HPMC guzobere n'ime mmiri na-enye ngwọta ụfọdụ viscoelasticity. Nke a viscoelasticity nwere ike gbanwee omume na-asọpụta nke mkpuchi ahụ, ka o wee nwee viscosity kwesịrị ekwesị mgbe ị na-ehichapụ, na-ebelata sagging na ntapu.
Shear thinning: Ihe ngwọta HPMC na-egosipụtakarị ihe ndị na-eme ka shear thinning, ya bụ, ha nwere viscosity dị elu na ọnụ ọgụgụ dị ala na obere viscosity na ọnụ ọgụgụ dị elu. Ihe onwunwe a na-eme ka mkpuchi ahụ nwee nkwụsi ike ka mma na steeti kwụ ọtọ ma dị mfe ịgbasa n'oge ewu.
Thixotropy: Ụfọdụ ihe ngwọta HPMC na-egosipụtakwa thixotropy, ya bụ, a na-eweghachi viscosity na izu ike, nke dị mkpa karịsịa maka ibelata sagging na ntapu nke mkpuchi.
3.3 Imelite arụmọrụ mkpuchi
HPMC ọ bụghị naanị na ọ nwere mmetụta dị mkpa na arụmọrụ nke mkpuchi n'oge a na-ewu ụlọ, kamakwa na-eme ka mma nke mkpuchi ikpeazụ dịkwuo mma. HPMC na-akwalite arụmọrụ nke mkpuchi n'akụkụ ndị a:
Mkpuchi mkpuchi: HPMC na-eme ka rheology nke mkpuchi ahụ dịkwuo mma, na-eme ka mgbasawanye na nhazi nke mkpuchi ahụ dịkwuo mma, na-eme ka mkpuchi ahụ dịkwuo nro ma na-edozi ahụ.
Mmiri na-eguzogide mmiri na ihu igwe: HPMC na-emepụta usoro netwọk dị ukwuu na mkpuchi, nke na-eme ka mmiri na-eguzogide mmiri na ike ịka nká nke mkpuchi, ma na-eme ka nkwụsị ihu igwe nke mkpuchi ahụ dịkwuo mma.
Adhesion: HPMC na-eme ka adhesion nke mkpuchi ahụ dịkwuo mma, nke mere na mkpuchi ahụ nwere ike ịkwado ya n'elu ihe nkedo ahụ, na-eme ka ọ dịkwuo ogologo oge.
4. Ngwa atụ nke HPMC
4.1 Ihe mkpuchi ihe owuwu
Na mkpuchi ụlọ, a na-eji HPMC emeziwanye mgbasa nke pigmenti na rheology nke mkpuchi, karịsịa maka mkpuchi mmiri. HPMC na-eme ka nkwụsi ike na ịrụ ọrụ arụ ọrụ nke mkpuchi ahụ dịkwuo mma, nke mere na mkpuchi ahụ nwere ọkwa dị mma na nkedo na mgbidi ahụ, ma na-egbochi ihe nkiri ahụ site na nkwụsịtụ na mkpuchi na-enweghị isi.
4.2 mkpuchi ụlọ ọrụ
A na-ejikwa HPMC n'ọtụtụ ebe na mkpuchi ụlọ ọrụ. Ọ bụghị naanị na ọ na-eme ka mgbasa nke pigmenti dịkwuo mma, ma na-eme ka arụ ọrụ nke mkpuchi mkpuchi dịkwuo mma, na-eme ka ihe nkiri ahụ na-eme ka ọ dịkwuo mma na metal, plastic na substrates ndị ọzọ, na ihe nkiri mkpuchi kpụrụ na-adịgide adịgide.
4.3 Ihe mkpuchi ndị ọzọ
A na-ejikwa HPMC dị iche iche dị iche iche dị iche iche dị iche iche, dị ka ihe mkpuchi ọkụ na-ekpuchi ọkụ, mkpuchi mgbochi, wdg. Ọrụ ya na mkpuchi ndị a bụ karịsịa iji meziwanye nkwụsi ike nke mkpuchi na ihe nkiri ihe nkiri, nke mere na mkpuchi ahụ na-arụ ọrụ dị mma. gburugburu mgbagwoju anya dị iche iche.
Dị ka mkpuchi mkpuchi, HPMC na-arụ ọrụ dị mkpa n'ịkwalite mgbasa nke pigmenti, meziwanye rheology nke mkpuchi na imeziwanye arụmọrụ nke ihe nkiri mkpuchi. Ọdịdị ya pụrụ iche na ọrụ ya na-enye ya ohere dị ukwuu nke ngwa ngwa na ụlọ ọrụ mkpuchi. Site na mmepe nke teknụzụ mkpuchi, ngwa nke HPMC ga-aga n'ihu na-agbasawanye, na-enye ohere ndị ọzọ maka nkwalite na imeghari arụmọrụ mkpuchi.
Oge nzipu: Jun-25-2024