Hydroxyethyl cellulose (HEC) bụ polima na-anaghị agbaze na mmiri, nke sitere na cellulose site na mgbanwe kemịkalụ. A na-eji ya eme ihe nke ukwuu n'ọtụtụ ụlọ ọrụ n'ihi ihe pụrụ iche ya, dịka ime ka ihe sie ike, ime ka ihe sie ike, na ime ihe nkiri. N'ọrụ ebe nkwụsi ike pH dị oke mkpa, ịghọta otu HEC si akpa àgwà n'okpuru ọnọdụ pH dị iche iche dị mkpa.
Nkwụsi ike nke pH nke HEC na-ezo aka n'ikike ya ijigide iguzosi ike n'ezi ihe ya, ihe ndị dị n'ime ya, na arụmọrụ ya n'ofe gburugburu pH dị iche iche. Nkwụsi ike a dị oke mkpa n'ọrụ dịka ngwaahịa nlekọta onwe onye, ọgwụ, mkpuchi, na ihe owuwu, ebe pH nke gburugburu ebe obibi nwere ike ịdị iche nke ukwuu.
Nhazi:
A na-emepụta HEC site na iji cellulose na ethylene oxide mee ihe n'okpuru ọnọdụ alkaline. Usoro a na-eme ka otu hydroxyethyl (-OCH2CH2OH) dochie otu hydroxyl nke ọkpụkpụ azụ cellulose. Ogo nke nnọchi (DS) na-egosi ọnụọgụgụ nke otu hydroxyethyl kwa nkeji anhydroglucose na yinye cellulose.
Njirimara:
Mmiri: HEC na-agbaze n'ime mmiri ma na-emepụta mmiri doro anya ma dị nro.
Viscosity: Ọ na-egosipụta àgwà pseudoplastic ma ọ bụ shear-thinning, nke pụtara na viscosity ya na-ebelata mgbe nrụgide shear gasịrị. Njirimara a na-eme ka ọ baa uru n'ọrụ ebe mmiri dị mkpa, dịka agba na mkpuchi.
Ịkpụkpọ: HEC na-enye viscosity nye ihe ngwọta, na-eme ka ọ baa uru dị ka ihe na-eme ka ọ sie ike n'ụdị dị iche iche.
Ịkpụ ihe nkiri: Ọ nwere ike ịmepụta ihe nkiri na-agbanwe agbanwe ma na-apụta ìhè mgbe akpọnwụrụ akpọnwụ, nke bara uru na ngwa dịka ihe nrapado na mkpuchi.
Ịkwụsi ike nke pH nke HEC
Ọtụtụ ihe na-emetụta nkwụsi ike pH nke HEC, gụnyere nhazi kemịkalụ nke polima, mmekọrịta ya na gburugburu ebe obibi, na ihe mgbakwunye ọ bụla dị na nhazi ahụ.
nkwụsi ike nke HEC na ọkwa pH dị iche iche:
1. pH asịd:
Na pH acidic, HEC na-adịkarị ike mana ọ nwere ike ịgafe mmiri n'ime oge dị ogologo n'okpuru ọnọdụ acid siri ike. Agbanyeghị, n'ọtụtụ ojiji bara uru, dịka ngwaahịa nlekọta onwe onye na mkpuchi, ebe a na-enweta pH acidic, HEC na-anọgide na-akwụsi ike n'ime oke pH nkịtị (pH 3 ruo 6). Karịa pH 3, ihe egwu nke hydrolysis na-abawanye, na-eduga na mbelata nwayọ nwayọ na viscosity na arụmọrụ. Ọ dị mkpa inyocha pH nke usoro nwere HEC ma gbanwee ha dịka ọ dị mkpa iji nọgide na-enwe nkwụsi ike.
2. pH nke na-anọpụ iche:
HEC na-egosi nkwụsi ike dị mma n'okpuru ọnọdụ pH na-anọpụ iche (pH 6 ruo 8). Oke pH a bụ ihe a na-ahụkarị n'ọtụtụ ngwa, gụnyere ihe ịchọ mma, ọgwụ, na ngwaahịa ezinụlọ. Usoro HEC nwere na-ejigide viscosity ha, ihe ndị na-eme ka ha sie ike, na arụmọrụ zuru oke n'ime oke pH a. Agbanyeghị, ihe ndị dị ka okpomọkụ na ike ionic nwere ike imetụta nkwụsi ike ma ekwesịrị ịtụle ya n'oge mmepe nhazi.
3. pH alkaline:
HEC anaghị akwụsi ike n'okpuru ọnọdụ alkaline ma e jiri ya tụnyere pH acidic ma ọ bụ nke na-anọpụ iche. N'ọkwa pH dị elu (karịa pH 8), HEC nwere ike imebi, na-ebute mbelata na viscosity na mfu nke arụmọrụ. Mmiri alkaline hydrolysis nke njikọ ether dị n'etiti azụ cellulose na otu hydroxyethyl nwere ike ime, na-eduga na mkpocha yinye na mbelata ibu molekul. Ya mere, na usoro alkaline dị ka ihe nhicha ma ọ bụ ihe owuwu, enwere ike ịhọrọ polymers ọzọ ma ọ bụ ihe na-eme ka ihe kwụsie ike karịa HEC.
Ihe Ndị Na-emetụta Ịkwụsi Ike pH
Ọtụtụ ihe nwere ike imetụta nkwụsi ike pH nke HEC:
Ọkwa Mgbanwe (DS): HEC nwere uru DS dị elu na-anọgide na-akwụsi ike karịa n'ofe oke pH sara mbara n'ihi mmụba nke nnọchi nke otu hydroxyl na otu hydroxyethyl, nke na-eme ka mmiri na-agbaze ma na-eguzogide hydrolysis dịkwuo mma.
Okpomọkụ: Okpomọkụ dị elu nwere ike ime ka mmeghachi omume kemịkalụ dịkwuo ngwa ngwa, gụnyere hydrolysis. Ya mere, idobe okpomọkụ nchekwa na nhazi kwesịrị ekwesị dị mkpa iji chekwaa nkwụsi ike pH nke usoro HEC nwere.
Ike Ionic: Nnukwu nnu ma ọ bụ ion ndị ọzọ dị na nhazi ahụ nwere ike imetụta nkwụsi ike nke HEC site na imetụta ike ya na mmekọrịta ya na molekul mmiri. A ga-emeziwanye ike Ionic iji belata mmetụta ndị na-emebi ihe.
Ihe mgbakwunye: Ntinye ihe mgbakwunye dịka surfactants, ihe nchekwa, ma ọ bụ ihe nchekwa nwere ike imetụta nkwụsi ike pH nke usoro HEC. A ga-eme nnwale ndakọrịta iji hụ na mgbakwunye dakọtara ma kwụsie ike.
Atụmatụ Ngwa na Nhazi
Ịghọta nkwụsi ike pH nke HEC dị oke mkpa maka ndị na-emepụta ihe n'ọtụtụ ụlọ ọrụ.
Lee ụfọdụ ihe ndị a na-atụle gbasara ngwa:
Ngwaahịa Nlekọta Onwe Onye: N'ime shampoos, ihe mkpuchi, na ude mmiri, idobe pH n'ime oke achọrọ (nke na-abụkarị gburugburu ebe na-anọpụ iche) na-eme ka HEC kwụsie ike na arụmọrụ ya dị ka ihe na-eme ka ọ sie ike ma na-egbochi ya.
Ọgwụ: A na-eji HEC eme ihe n'ihe nkwụsịtụ ọnụ, ihe ngwọta anya, na ihe ndị e ji eme ihe n'elu ahụ́. A ga-emepụta ma chekwaa ihe ndị e ji eme ihe n'okpuru ọnọdụ ndị na-eme ka HEC kwụsie ike iji hụ na ngwaahịa ahụ dị irè ma dịgide ogologo oge.
Mkpuchi na Agba: A na-eji HEC eme ihe dị ka ihe na-agbanwe rheology na ihe na-eme ka ihe sie ike na agba na mkpuchi mmiri. Ndị na-emepụta ihe ga-ejikọta ihe achọrọ na pH na ihe ndị ọzọ a chọrọ dịka viscosity, leveling, na nhazi ihe nkiri.
Ihe E Ji Arụ Ọrụ: N'ime usoro simenti, HEC na-arụ ọrụ dị ka ihe na-ejide mmiri ma na-eme ka ọrụ dịkwuo mma. Agbanyeghị, ọnọdụ alkaline dị na simenti nwere ike igbochi nkwụsi ike HEC, na-achọ nhọrọ na mgbanwe nhazi nke ọma.
Hydroxyethyl cellulose (HEC) na-enye uru rheological na ọrụ bara uru n'ọtụtụ ngwa. Ịghọta nkwụsi ike pH ya dị mkpa maka ndị na-emepụta ihe iji mepụta usoro kwụsiri ike ma dị irè. Ọ bụ ezie na HEC na-egosipụta ezigbo nkwụsi ike n'okpuru ọnọdụ pH na-anọpụ iche, a ga-atụlekwa gburugburu acidic na alkaline iji gbochie mmebi ma hụ na arụmọrụ kacha mma. Site n'ịhọrọ ọkwa HEC kwesịrị ekwesị, imeziwanye paramita nhazi, na itinye ọnọdụ nchekwa kwesịrị ekwesị n'ọrụ, ndị na-emepụta ihe nwere ike iji uru nke HEC mee ihe n'ọtụtụ gburugburu pH.
Oge ozi: Maachị-29-2024