Hydroxyethyl cellulose (HEC) bụ mmiri-soluble mmiri na-abụghị ionic cellulose ether. A na-eji ya eme ihe n'ọtụtụ ebe na mkpuchi mmiri n'ihi ịdị mma ya, emulsifying, imepụta ihe nkiri na ihe nkwụsịtụ. Dị ka a thickener na stabilizer na coatings, HEC nwere ike budata mma rheological Njirimara na paintability nke coatings.
1. Isi ọrụ nke hydroxyethyl cellulose
N'ime mkpuchi mmiri, a na-egosipụta isi ọrụ HEC n'akụkụ ndị a:
Mmetụta siri ike: HEC nwere ikike ịgbatị siri ike, nke nwere ike imeziwanye viscosity na nkwusioru ike nke mkpuchi mmiri na-egbochi pigmenti na ihe nkpuchi na mkpuchi edozi.
Meziwanye rheology: HEC nwere ike ịhazigharị mmiri na mmiri na-ekpuchi mmiri ka o wee gosipụta obere viscosity n'okpuru akwa shear, na-eme ka ọ dịkwuo mfe ịgbasa mgbe ị na-ese ihe, ebe ọ na-egosipụta viscosity dị elu n'okpuru ọnọdụ static, si otú ahụ na-ebelata mmiri nke agba. nghọta .
Nkwụsi ike na-emewanyewanye: HEC nwere ezigbo nkwụsi ike na-ekpo ọkụ na nkwụsi ike nchekwa, nke nwere ike ịgbatị ndụ mkpuchi nke mkpuchi ma hụ na nkwụsi ike na gburugburu dị iche iche.
Meziwanye ihe na-emepụta ihe nkiri: HEC na-emepụta ihe nkiri na-agbanwe agbanwe mgbe agba agbachachara, na-eme ka adhesion na-eyi nguzogide nke ihe nkiri agba na imeziwanye ọrụ nchebe nke agba.
2. Otu esi eji HEC
Mgbe ị na-eji HEC na mkpuchi mmiri, a na-ejikarị ụzọ mgbasa na mgbasa na ụzọ mgbakwunye kpọmkwem. Ndị a bụ usoro na usoro eji eme ihe:
() 1. Pretreatment igbari HEC
HEC bụ ntụ ntụ nke siri ike igbari ozugbo na ngwa ngwa na-emepụta clumps na mmiri. Ya mere, tupu ịgbakwunye HEC, a na-atụ aro ka ị gbasaa ya. Usoro ndị a na-emebu bụ ndị a:
Kwuo ma gbasasịa: Jiri nwayọọ tinye HEC na mmiri n'okpuru obere ọsọ na-akpali akpali iji zere ịmepụta clumps. Ọnụ ego nke HEC agbakwunyere kwesịrị imezi ya dị ka viscosity chọrọ nke mkpuchi, n'ozuzu na-aza 0.3% -1% nke ngụkọta usoro.
Mgbochi ịme achịcha: Mgbe ị na-agbakwunye HEC, a na-agbakwunye obere ihe mgbochi na-eme ka ọ bụrụ ethanol, propylene glycol, wdg, na mmiri iji mee ka ntụ ntụ HEC gbasaa nke ọma ma belata ohere nke ịme achịcha.
(2). Usoro mgbasa na mgbasa
Usoro mgbasa ozi na mgbasa ozi bụ ịgbari HEC iche n'ime mmiri mmiri viscous n'oge usoro nkwadebe nke agba, wee tinye ya na agba. Usoro ndị a kapịrị ọnụ bụ ndị a:
Usoro mgbasa: HEC siri ike igbari na nkịtị ma ọ bụ obere okpomọkụ, n'ihi ya, mmiri nwere ike dị ọkụ nke ọma iji ruo okpomọkụ nke 30-40 ° C iji mee ka mgbasa nke HEC dịkwuo elu.
Oge na-akpali akpali: HEC na-agbaze nwayọọ nwayọọ ma na-achọkarị ịkpali maka awa 0.5-2 ruo mgbe agbazere ya kpamkpam n'ime mmiri mmiri translucent ma ọ bụ translucent viscous.
Gbanwee uru pH: Mgbe HEC gbazere, a pụrụ imezi uru pH nke ngwọta dị ka mkpa, na-emekarị n'etiti 7-9, iji meziwanye nkwụsi ike nke mkpuchi.
(3). Usoro mgbakwunye ozugbo
Usoro mgbakwunye kpọmkwem bụ ịgbakwunye HEC ozugbo n'ime usoro mkpuchi n'oge usoro mmepụta ihe mkpuchi, nke kwesịrị ekwesị maka mkpuchi nwere usoro pụrụ iche chọrọ. Biko tinye uche na isi ihe ndị a mgbe ị na-arụ ọrụ:
buru ụzọ kpoo mmiri wee mee mmiri: TinyeHECna akụkụ akọrọ nke agba nke mmiri na-ebu ụzọ, jikọta ya na ntụ ntụ ndị ọzọ, wee tinye mmiri na mmiri mmiri iji zere agglomeration.
Njikwa shear: Mgbe ị na-agbakwunye HEC na mkpuchi ahụ, ọ dị mkpa iji ngwá ọrụ na-ejikọta ihe dị elu, dị ka onye na-agba ọsọ ọsọ ọsọ, nke mere na HEC nwere ike gbasaa n'otu oge na obere oge wee ruo nhụsianya achọrọ.
3. Njikwa nke HEC onunu ogwu
Na mkpuchi mmiri na-ekpuchi mmiri, ọnụ ọgụgụ HEC kwesịrị ịchịkwa dịka mkpa nke mkpuchi ahụ si dị. Ọtụtụ HEC ga-eme ka viscosity mkpuchi dị elu ma na-emetụta ọrụ ọrụ; Obere HEC nwere ike ọ gaghị enweta mmetụta mgbịrịgba a tụrụ anya ya. N'okpuru ọnọdụ nkịtị, a na-achịkwa usoro ọgwụgwọ HEC na 0.3% -1% nke usoro mkpokọta, na enwere ike gbanwee oke kpọmkwem site na nyocha.
4. Akpachara anya maka HEC na mkpuchi mmiri
Zere agglomeration: HEC na-achọsi ike na mmiri, ya mere, mgbe ị na-agbakwunye ya, tinye ya nwayọọ nwayọọ dị ka o kwere mee, gbasasịa ya nke ọma, ma zere ngwakọta nke ikuku dị ka o kwere mee.
Okpomọkụ mgbasa: HEC na-agbaze ngwa ngwa na okpomọkụ dị elu, mana okpomọkụ ekwesịghị gafere 50 Celsius, ma ọ bụghị ya nwere ike imetụta viscosity ya.
Ọnọdụ na-akpali akpali: A na-achọ mkpali na-aga n'ihu n'oge usoro mgbasa nke HEC, na a ga-eji ihe mkpuchi nwere mkpuchi mee ihe dị ka o kwere mee iji gbochie mmetọ site na adịghị ọcha nke mpụga na evaporation nke mmiri.
Ndozi nke uru pH: viscosity nke HEC ga-abawanye n'okpuru ọnọdụ alkaline, ya mere, uru pH nke ngwọta kwesịrị ka a gbanwee nke ọma iji gbochie arụmọrụ nke mkpuchi ahụ na-ebelata n'ihi oke pH.
Nnwale ndakọrịta: Mgbe ị na-emepụta usoro ọhụrụ, a ga-anwale iji HEC maka ndakọrịta na ihe ndị ọzọ na-ekpo ọkụ, emulsifiers, wdg iji hụ na ọ dịghị mmeghachi omume ọjọọ ga-eme.
5. Ihe atụ ngwa ngwa nke HEC na mkpuchi mmiri
Enwere ike iji HEC mee ihe dị ka ihe na-eme ka mmiri dị n'ime mgbidi mgbidi dị n'ime mmiri na mmiri na-ekpuchi mmiri. Ọmụmaatụ:
Agba mgbidi dị n'ime ime mmiri: A na-eji HEC emeziwanye ihe nrịbama nke agba ahụ, na-eme ka ngwa ahụ dịkwuo nro na ọbụna karị, na-ebelata akara akara.
Mkpuchi mgbidi dị n'èzí nke mmiri: HEC nwere ike ịkwalite nkwụsị nke sag na ihu igwe nke mkpuchi ma zere mmebi nke ihe nkiri mkpuchi nke mmiri ozuzo kpatara.
Ngwa nke HEC na mkpuchi mmiri na-adabere na mmiri nwere ike ọ bụghị nanị na-eme ka arụ ọrụ arụ ọrụ nke mkpuchi ahụ dịkwuo mma, kamakwa imeziwanye àgwà doro anya na ịdịte aka nke ihe nkiri mkpuchi. N'ime ngwa ndị dị irè, dịka ihe ndị a chọrọ n'aka nke mkpuchi ahụ, a na-ahọrọ usoro mgbasa na mgbakwunye ego nke HEC nke ọma, ma jikọta ya na nkwadebe nke ihe ndị ọzọ, mmetụta mkpuchi dị elu nwere ike nweta.
Oge nzipu: Nov-10-2024