Hydroxyethyl cellulose (HEC) na hydroxypropyl cellulose (HPC) bụ ihe e ji emepụta cellulose abụọ a na-ejikarị eme ihe n'ọtụtụ ebe mmepụta ihe, dị ka ọgwụ, ihe ịchọ mma, nri, na ihe ụlọ. Ọ bụ ezie na usoro kemịkal ha yiri nke a na-etolite site na iwebata ihe ndị na-anọchi anya mkpụrụ ndụ cellulose, ha nwere nnukwu ọdịiche dị na njirimara kemịkal, ihe anụ ahụ, na mpaghara ngwa.
1. Ọdịiche dị na nhazi kemịkalụ
A na-emepụta Hydroxyethyl cellulose (HEC) site na iwebata otu hydroxyethyl (-CH₂CH₂OH) n'ime mgbanaka glucose nke molekul cellulose. Ọdịdị kemịkal ya nwere ọnụ ọgụgụ dị ukwuu nke ihe ndị na-emepụta hydroxyethyl, nke na-eme ka HEC nwee ezigbo mmiri solubility na ihe ndị na-eme ka ọkpụkpụ.
Hydroxypropyl cellulose (HPC) na-ewebata otu hydroxypropyl (-CH₂CHOHCH₃) n'ime molekul cellulose. N'ihi ọnụnọ nke otu hydroxypropyl a, HPC na-egosipụta ụfọdụ njirimara dị iche na HEC. Dịka ọmụmaatụ, ọ nwere ogo hydrophobicity ụfọdụ, nke na-eme ka ọ na-edozi ya na ụfọdụ ihe mgbaze organic, dị ka ethanol, mmanya isopropyl, wdg.
2. Solubility iche
Otu n'ime ihe ndị bụ isi nke HEC bụ ezigbo mmiri solubility, karịsịa na mmiri oyi. N'ihi iwebata otu hydroxyethyl, HEC nwere ike ịmepụta njikọ hydrogen na mkpụrụ ndụ mmiri mgbe agbazere, si otú ahụ na-agbasa ngwa ngwa ma gbazee. Ya mere, HEC nwere ngwa ngwa dị iche iche na usoro mmiri, dị ka ihe mkpuchi mmiri, adhesives, detergents, wdg.
Solubility nke HPC dị mgbagwoju anya. Solubility nke HPC na mmiri na-emetụta nke ukwuu site na okpomọkụ. Ọ nwere ezigbo solubility na obere okpomọkụ, ma gelation ma ọ bụ mmiri ozuzo nwere ike ime na okpomọkụ dị elu. N'otu oge ahụ, HPC nwekwara solubility na organic solvents (dị ka ethanol, isopropyl mmanya, wdg), nke na-enye ya uru na ụfọdụ pụrụ iche ngwa, dị ka organic mgbaze dabeere formulations na ụfọdụ ọgwụ nkwadebe.
3. Ọdịiche dị na thickening mmetụta na rheology
HEC nwere ikike ịgbatị nke ọma ma nwee ike ịbawanye viscosity nke ngwọta na ngwọta mmiri mmiri, yabụ a na-ejikarị ya dị ka onye na-agba agba, stabilizer na onye na-ahụ maka gelling. Mmetụta ịdị arọ nke HEC na-emetụta ịdị arọ molekụla na ogo nke nnọchi. Ibu ibu nke molekụla na ogo dị elu nke ngbanwe, ka viscosity nke ngwọta dị ukwuu. N'otu oge ahụ, omume rheological nke ngwọta HEC bụ pseudoplastic, ya bụ, ka ọnụ ọgụgụ nke shea na-abawanye, viscosity nke ngwọta na-ebelata, nke na-enye aka nke ukwuu maka nhazi nke chọrọ nkwụsi ike na ezigbo mma.
Mmetụta siri ike nke HPC adịghị ike, mana n'ihi njirimara nhazi ya, ngwọta ya na-egosi njirimara rheological dị iche iche. Ihe ngwọta HPC na-enwekarị ihe onwunwe mmiri Newtonian, ya bụ, viscosity ngwọta na-adabere na ọnụ ọgụgụ shear, nke dị ezigbo mkpa na ụfọdụ ngwa na-achọ viscosity otu. Tụkwasị na nke ahụ, HPC nwekwara ezigbo ihe na-emepụta ihe nkiri, nke na-eme ka a na-ejikarị ya eme ihe n'ọhịa dị ka ọgwụ na mkpuchi.
4. Nkwụsi ike na nguzogide kemịkalụ
HEC na-egosi nkwụsi ike nke kemịkalụ dị elu na ọkwa pH dị iche iche ma nwee ike na-arụ ọrụ nke ọma na pH nke 2 ruo 12. Ya mere, HEC dị mma maka ojiji n'okpuru ọnọdụ acidic na alkaline ma na-eji ya eme ihe n'ọtụtụ ebe na detergents, cosmetics na ubi ndị ọzọ.
Ọ bụ ezie na HPC nwere ezigbo nkwụsi ike nke kemịkalụ, ngbanwe ya na uru pH dị ntakịrị warara, yana ọ dabara adaba maka gburugburu acid na-anọpụ iche ma ọ bụ adịghị ike. N'ọnọdụ ụfọdụ ebe achọrọ imepụta ihe nkiri ma ọ bụ hydrophobicity, HPC nwere ike inye ọmarịcha arụmọrụ n'ihi nhazi ya pụrụ iche, dị ka ihe ntọhapụ ma ọ bụ ihe mkpuchi maka ọgwụ.
5. Ọdịiche dị na mpaghara ngwa
Mpaghara ngwa nke HEC gụnyere:
Ihe a na-ewu ihe: Dị ka onye na-emepụta ihe na gelling, HEC na-ejikarị ihe ndị dabeere na ciment, mkpuchi na ihe ndị na-ewu ụlọ na-enyere aka melite arụmọrụ ụlọ na nkwụsị mmiri.
Mkpuchi na agba: A na-eji HEC na mkpuchi mmiri na-eme ka ọ dị arọ, kwụsịtụ, gbasasịa na kwụsie ike, si otú a na-eme ka mkpuchi ahụ dịkwuo mma na ọdịdị ya.
Ngwaahịa kemịkalụ kwa ụbọchị: Na ngwaahịa kemịkalụ kwa ụbọchị dị ka ihe nchacha na shampoos, HEC na-eje ozi dị ka ihe na-eme ka ihe sie ike na nkwụsi ike, nke nwere ike melite udidi na ahụmịhe ojiji nke ngwaahịa ahụ.
Mpaghara ngwa ngwa nke HPC gụnyere:
Ebe a na-ere ọgwụ: A na-ejikarị HPC dị ka ihe mkpuchi na ihe nkwado nkwado maka ọgwụ n'ihi ọmarịcha ihe nkiri na-emepụta ihe na ntọhapụ ya. Na mgbakwunye, ọ nwekwara ngwa dị mkpa na mbadamba mbadamba.
Nri na ịchọ mma: HPC na-eji dị ka a thickener na emulsifier na nri ụlọ ọrụ, na dị ka a film-akpụ mmadụ n'ụlọnga ịchọ mma na-enyere aka melite udidi na ductility nke ngwaahịa.
Mkpuchi na Inks: N'ihi solubility ya na ihe na-emepụta ihe nkiri, a na-ejikarị HPC eme ihe na mkpuchi na ink nhazi nke chọrọ ihe mgbaze organic, na-enye ihe nkiri dị nro na nke ọma.
6. Nchekwa gburugburu ebe obibi na nchekwa
A na-ewere ma HEC na HPC dị ka ihe nchekwa maka ahụ mmadụ na gburugburu ebe obibi ma na-ejikarị eme ihe na ngwaahịa ndị chọrọ kọntaktị na ahụ mmadụ, dị ka ihe ịchọ mma na ọgwụ. Otú ọ dị, HPC bụ soluble na ụfọdụ organic solvents, nke nwere ike ịkpata ụfọdụ ihe ịma aka na ngwa nwere elu gburugburu ebe obibi chọrọ, ebe HEC bụ tumadi eji na mmiri-soluble formulations, otú ọ dị mfe izute green gburugburu ebe obibi chọrọ.
Hydroxyethyl cellulose (HEC) na hydroxypropyl cellulose (HPC), dị ka cellulose mmepụta, nwere myirịta na chemical Ọdịdị, solubility, ndim mmetụta, rheological Njirimara, ngwa ubi na gburugburu ebe obibi nchebe Njirimara. Enwere nnukwu ọdịiche na akụkụ. N'ihi oke mmiri solubility ya na ihe na-eme ka ọ dịkwuo mma, a na-eji HEC eme ihe n'ọtụtụ ebe na nhazi mmiri, dị ka mkpuchi, ihe ụlọ na ngwaahịa kemịkalụ kwa ụbọchị. HPC nwere ngwa pụrụ iche na ọgwụ, nri na ụfọdụ mkpuchi pụrụ iche n'ihi solubility ya, imepụta ihe nkiri na ihe ntọhapụ ya. Nhọrọ nke mmepụta cellulose ga-eji na-adaberekarị na mkpa ngwa ngwa yana chọrọ nhazi.
Oge nzipu: Ọktoba 29-2024