Hydroxyethyl cellulose (HEC) bụ ihe na-abụghị ionic, mmiri-soluble polymer nke sitere na cellulose site na mgbanwe kemịkalụ. A na-eji ya eme ihe n'ọtụtụ ụlọ ọrụ dị iche iche n'ihi njirimara ya pụrụ iche, dị ka ịgbatị, nkwụsi ike, na ike imepụta ihe nkiri. Na ngwa ebe nkwụsi ike pH dị mkpa, ịghọta otú HEC si akpa àgwà n'okpuru ọnọdụ pH dị iche iche dị mkpa.
Nkwụsi ike pH nke HEC na-ezo aka n'ikike ya iji nọgide na-eguzosi ike n'ezi ihe nhazi ya, njirimara rheological, na arụmọrụ n'ofe gburugburu pH dị iche iche. Nkwụsi ike a dị oke mkpa na ngwa dị ka ngwaahịa nlekọta onwe onye, ọgwụ ọgwụ, mkpuchi, na ihe owuwu, ebe pH nke gburugburu ebe obibi nwere ike ịdị iche iche.
Nhazi:
A na-emepụta HEC na-emekarị site na imeghachi cellulose na ethylene oxide n'okpuru ọnọdụ alkaline. Usoro a na-ebute ngbanwe nke otu hydroxyl nke ọkpụkpụ azụ cellulose na otu hydroxyethyl (-OCH2CH2OH). Ogo nke nnọchi (DS) na-egosi nkezi ọnụọgụ hydroxyethyl otu otu anhydroglucose n'ime agbụ cellulose.
Njirimara:
Solubility: HEC bụ soluble na mmiri na-emepụta doro anya, viscous ngwọta.
Viscosity: Ọ na-egosipụta pseudoplastic ma ọ bụ ịkpa àgwà dị nro, nke pụtara viscosity ya na-ebelata n'okpuru nrụgide siri ike. Ihe onwunwe a na-eme ka ọ baa uru na ngwa ebe eruba dị mkpa, dị ka agba na mkpuchi.
Thickening: HEC na-enye viscosity na ngwọta, na-eme ka ọ baa uru dị ka ihe na-eme ka ọ dị arọ na usoro dị iche iche.
Ịmepụta ihe nkiri: Ọ nwere ike ịmepụta ihe nkiri na-agbanwe agbanwe na nke doro anya mgbe a mịrị amị, nke bara uru na ngwa dị ka nrapado na mkpuchi.
pH kwụsie ike nke HEC
A na-emetụta nkwụsi ike pH nke HEC site n'ọtụtụ ihe, gụnyere usoro kemịkalụ nke polymer, mmekọrịta na gburugburu ebe obibi, na ihe mgbakwunye ọ bụla dị na nhazi ahụ.
Nkwụsi ike pH nke HEC na pH dị iche iche:
1. Acid pH:
Na pH acidic, HEC kwụsiri ike mana ọ nwere ike ịnwe hydrolysis ogologo oge n'okpuru ọnọdụ acid siri ike. Otú ọ dị, n'ọtụtụ ngwa bara uru, dị ka ngwaahịa nlekọta onwe onye na mkpuchi, ebe a na-ezute pH acidic, HEC na-anọgide na-eguzosi ike n'ime ụdị pH (pH 3 ruo 6). E wezụga pH 3, ihe ize ndụ nke hydrolysis na-abawanye, na-eduga na mbelata nke nta nke nta na viscosity na arụmọrụ. Ọ dị mkpa iji nyochaa pH nke usoro nwere HEC ma mezie ha ka ọ dị mkpa iji kwado nkwụsi ike.
2. pH na-anọpụ iche:
HEC na-egosiputa nkwụsi ike dị mma n'okpuru ọnọdụ pH na-anọpụ iche (pH 6 ruo 8). Ụdị pH a bụ ihe a na-ahụkarị n'ọtụtụ ngwa, gụnyere ihe ịchọ mma, ọgwụ na ngwaahịa ụlọ. Usoro ndị nwere HEC na-ejigide viscosity ha, ihe ndị na-eme ka ha sie ike, na arụmọrụ n'ozuzu ha n'ime oke pH a. Otú ọ dị, ihe ndị dị ka okpomọkụ na ike ionic nwere ike imetụta nkwụsi ike na ekwesịrị ịtụle n'oge mmepe nhazi.
3. alkaline pH:
HEC anaghị akwụsi ike n'okpuru ọnọdụ alkaline ma e jiri ya tụnyere acidic ma ọ bụ na-anọpụ iche pH. Na ọkwa pH dị elu (n'elu pH 8), HEC nwere ike ịda mbà, na-ebute mbelata na viscosity na nkwụsị nke arụmọrụ. Alkaline hydrolysis nke njikọ ether dị n'etiti ọkpụkpụ azụ cellulose na ìgwè hydroxyethyl nwere ike ime, na-eduga n'agbụ agbụ na ibelata ịdị arọ molecular. Ya mere, n'ụdị alkaline dị ka ihe nchacha ma ọ bụ ihe owuwu, a ga-ahọrọ polymers ọzọ ma ọ bụ stabilizers karịa HEC.
Ihe na-emetụta pH Stability
Ọtụtụ ihe nwere ike imetụta nkwụsi ike pH nke HEC:
Ọkwa nke nnọchi (DS): HEC nwere ụkpụrụ DS dị elu na-achọ ka ọ kwụsie ike n'ofe pH sara mbara n'ihi mmụba nke otu hydroxyl na otu hydroxyethyl, nke na-eme ka mmiri solubility na iguzogide hydrolysis.
Okpomọkụ: Okpomọkụ dị elu nwere ike ime ka mmeghachi omume kemịkal mee ngwa ngwa, gụnyere hydrolysis. Ya mere, idobe nchekwa kwesịrị ekwesị na nhazi okpomọkụ dị mkpa maka ichekwa nkwụsi ike pH nke usoro HEC nwere.
Ike Ionic: Ọnụnọ dị elu nke nnu ma ọ bụ ion ndị ọzọ na nhazi ahụ nwere ike imetụta nkwụsi ike nke HEC site na imetụta solubility ya na mmekọrịta ya na ụmụ irighiri mmiri. Ekwesịrị ịkwalite ike ionic iji belata mmetụta na-emebi emebi.
Ihe mgbakwunye: Mgbakwunye mgbakwunye dị ka surfactants, preservatives, ma ọ bụ ndị na-echekwa ihe nwere ike imetụta nkwụsi ike pH nke usoro HEC. Ekwesịrị ịme nnwale ndakọrịta iji hụ na ndakọrịta mgbakwunye na nkwụsi ike.
Ngwa na Atụmatụ Nhazi
Ịghọta nkwụsi ike pH nke HEC dị oké mkpa maka ndị na-emepụta ihe na ụlọ ọrụ dị iche iche.
Nke a bụ ụfọdụ ihe gbasara ngwa:
Ngwaahịa Nlekọta Onwe Onye: Na shampoos, conditioners, na lotions, na-edobe pH n'ime oke a chọrọ (na-anọpụ iche na-anọpụ iche) na-eme ka nkwụsi ike na ịrụ ọrụ nke HEC dị ka onye na-emepụta ihe na nkwụsịtụ.
Ọgwụ: A na-eji HEC eme ihe na nkwusioru ọnụ, ngwọta anya, na usoro nhazi. Ekwesịrị ịhazi ma chekwaa usoro n'okpuru ọnọdụ ndị na-echekwa nkwụsi ike HEC iji hụ na nrụpụta ngwaahịa na ndụ nchekwa.
Mkpuchi na agba: HEC na-arụ ọrụ dị ka onye na-emegharị rheology na thickener na agba na mkpuchi mmiri. Ndị na-emepụta ihe ga-edozi ihe pH chọrọ na njirisi arụmọrụ ndị ọzọ dị ka viscosity, ọkwa ọkwa, na nhazi ihe nkiri.
Ihe eji arụ ọrụ: N'ime usoro cimentious, HEC na-arụ ọrụ dị ka onye na-ejigide mmiri ma na-eme ka arụ ọrụ dịkwuo mma. Otú ọ dị, ọnọdụ alkaline na ciment nwere ike ịgbagha nkwụsi ike HEC, na-eme ka nhọrọ nlezianya na nhazi nhazi.
Hydroxyethyl cellulose (HEC) na-enye ihe bara uru rheological na arụ ọrụ na ngwa dị iche iche. 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 nkwụsi ike dị mma n'okpuru ọnọdụ pH na-anọpụ iche, a ghaghị itinye echiche maka gburugburu acidic na alkaline iji gbochie mmebi ma hụ na arụmọrụ kacha mma. Site na ịhọrọ ọkwa HEC kwesịrị ekwesị, na-eme ka usoro nhazi dị mma, na imejuputa ọnọdụ nchekwa kwesịrị ekwesị, ndị na-emepụta ihe nwere ike ijikwa uru nke HEC n'ofe gburugburu pH dị iche iche.
Oge nzipu: Mar-29-2024