Imepụta hydroxyethyl cellulose (HEC) gụnyere usoro mmeghachi omume kemịkalụ iji gbanwee cellulose, polima eke sitere na osisi. A na-eji HEC eme ihe nke ukwuu n'ọtụtụ ụlọ ọrụ dị iche iche, gụnyere ọgwụ, ihe ịchọ mma, nri, na owuwu, n'ihi na ọ na-eme ka ọ sie ike, na-eme ka ọ kwụsie ike, ma na-ejide mmiri.
Okwu Mmalite nke Hydroxyethyl Cellulose (HEC)
Hydroxyethyl cellulose (HEC) bụ polima na-anaghị agbaze na mmiri, nke sitere na cellulose site na mgbanwe kemịkalụ. A na-ejikarị ya eme ihe dị ka ihe na-eme ka ihe sie ike, na-eme ka ọ sie ike n'ọtụtụ ụlọ ọrụ dị iche iche.
Ngwaọrụ
Cellulose: Isi ihe eji emepụta HEC. Enwere ike inweta cellulose site na ihe dị iche iche sitere na osisi dịka pulp osisi, owu, ma ọ bụ ihe fọdụrụ n'ọrụ ugbo.
Ethylene Oxide (EO): Ọgwụ dị mkpa e ji ewebata otu hydroxyethyl n'ime ọkpụkpụ azụ cellulose.
Alkali: A na-ejikarị sodium hydroxide (NaOH) ma ọ bụ potassium hydroxide (KOH) eme ihe dị ka ihe na-akpali mmeghachi omume.
Usoro Mmepụta
Mmepụta nke HEC gụnyere ime ka cellulose dị n'ime selula na ethylene oxide n'okpuru ọnọdụ alkaline.
Usoro ndị a na-akọwa usoro a:
1. Ọgwụgwọ tupu Cellulose
A na-ebu ụzọ sachaa cellulose iji wepụ ihe ndị na-adịghị mma dịka lignin, hemicellulose, na ihe ndị ọzọ a na-ewepụta. A na-akpọcha cellulose ahụ e mere ka ọ dị mmiri mmiri kpọmkwem.
2. Mmeghachi omume Etherification
Nkwadebe nke Ngwọta Alkaline: A na-akwadebe mmiri mmiri nke sodium hydroxide (NaOH) ma ọ bụ potassium hydroxide (KOH). Njupụta nke ngwọta alkali dị oke mkpa ma ọ dị mkpa ka emelite ya dabere na oke achọrọ nke nnọchi (DS) nke ngwaahịa ikpeazụ.
Ntọala Mmeghachi Omume: A na-agbasa cellulose dị ọcha n'ime mmiri alkali. A na-ekpo ọkụ ngwakọta ahụ ruo n'ọnọdụ okpomọkụ kpọmkwem, nke na-adịkarị ihe dị ka 50-70°C, iji hụ na cellulose ahụ azara kpamkpam ma dị mfe ịnweta ya maka mmeghachi omume ahụ.
Mgbakwunye Ethylene Oxide (EO): A na-agbakwunye Ethylene oxide (EO) nwayọ nwayọ n'ime arịa mmeghachi omume ahụ ma na-echekwa okpomọkụ ma na-akpali ya mgbe niile. Mmeghachi omume ahụ bụ exothermic, yabụ njikwa okpomọkụ dị oke mkpa iji gbochie oke okpomọkụ.
Nlekota Mmeghachi Omume: A na-enyocha ọganihu nke mmeghachi omume ahụ site na inyocha ihe nlele n'oge dị iche iche. Enwere ike iji usoro dịka Fourier-transform infrared spectroscopy (FTIR) chọpụta ogo nnọchi (DS) nke otu hydroxyethyl na azụ cellulose.
Ịsa ahụ na Ịsa ahụ: Ozugbo e nwetara DS achọrọ, a na-eme ka mmeghachi omume ahụ kwụsị site n'iji acid, nke a na-akpọkarị acetic acid, mee ka ngwọta alkaline ghara ịdị irè. A na-eji mmiri saa HEC nke si na ya pụta nke ọma iji wepụ ihe ndị na-adịghị arụ ọrụ na ihe ndị na-adịghị mma.
3. Ịsachapụ na Ịkpọ nkụ
A na-asacha HEC ahụ site na nzacha ma ọ bụ centrifugation iji wepụ ihe ndị na-adịghị mma ọ bụla fọdụrụ. A na-akpọcha HEC ahụ e mere ka ọ dị mmiri mmiri kpọmkwem iji nweta ngwaahịa ikpeazụ.
Njikwa Ogo
Njikwa mma dị oke mkpa n'oge mmepụta HEC iji hụ na ngwaahịa ikpeazụ na-adị ọcha ma na-adịgide adịgide. Isi ihe a ga-enyocha gụnyere:
Ọkwa nnọchi (DS)
Viscositi
Mmiri dị n'ime ya
pH
Ịdị ọcha (enweghị ihe ruru unyi)
A na-ejikarị usoro nyocha dịka FTIR, nha viscosity, na nyocha elemental eme ihe maka njikwa mma.
Ngwa nke Hydroxyethyl Cellulose (HEC)
HEC na-achọta ngwa dị iche iche n'ihi njirimara ya dị iche iche:
Ọgwụ: A na-eji ya eme ihe dị ka ihe na-eme ka ihe sie ike n'ọnụ, ọgwụ ndị e ji mee ihe n'elu ahụ́, na usoro nnyefe ọgwụ a na-achịkwaghị achịkwa.
Ihe ịchọ mma: A na-ejikarị ude, ude mmanụ, na shampoo eme ihe dị ka ihe na-eme ka ọ sie ike ma na-eme ka ọ sie ike.
Nri: A na-etinye ya na ngwaahịa nri dị ka ihe na-eme ka ihe sie ike ma na-eme ka ahụ sie ike, ihe na-eme ka ihe na-eme ka ahụ sie ike, ihe na-eme ka ahụ sie ike, na ihe na-eme ka ahụ sie ike.
Ọrụ: A na-eji ya eme ihe n'ime simenti na ihe e ji kpụọ ihe iji mee ka ọrụ dịkwuo mma ma na-echekwa mmiri nke ọma.
Ihe Ndị A Na-atụle Banyere Gburugburu Ebe Obibi na Nchekwa
Mmetụta Gburugburu Ebe Obibi: Mmepụta HEC gụnyere iji kemịkalụ dịka ethylene oxide na alkalis, nke nwere ike inwe mmetụta gburugburu ebe obibi. Njikwa ihe mkpofu kwesịrị ekwesị na ịgbaso iwu dị mkpa iji belata mmetụta gburugburu ebe obibi.
Nchekwa: Ethylene oxide bụ gas na-emeghachi omume nke ukwuu ma na-ere ọkụ, nke na-etinye ihe egwu nchekwa n'oge njikwa na nchekwa. Ọ dị mkpa ka ikuku na-eku ume nke ọma, ngwa nchekwa onwe onye (PPE), na usoro nchekwa iji hụ na nchekwa ndị ọrụ dị.
Hydroxyethyl cellulose (HEC) bụ polima bara uru nke nwere ọtụtụ ojiji n'ụlọ ọrụ dị iche iche, site na ọgwụ ruo na owuwu. Mmepụta ya gụnyere iwepụ cellulose na ethylene oxide n'okpuru ọnọdụ alkaline. Usoro njikwa mma dị oke mkpa iji hụ na ngwaahịa ikpeazụ dị n'otu ma dị ọcha. A ga-elebakwa anya n'ihe gbasara gburugburu ebe obibi na nchekwa n'oge usoro mmepụta. Site n'ịgbaso usoro na usoro kwesịrị ekwesị, enwere ike imepụta HEC nke ọma ma na-ebelata mmetụta gburugburu ebe obibi ma na-ahụ na nchekwa ndị ọrụ.
Ntuziaka zuru oke a na-ekpuchi usoro mmepụta nke hydroxyethyl cellulose (HEC) n'ụzọ zuru ezu, site na ihe ndị e ji emepụta ihe ruo na njikwa mma na ojiji, na-enye nghọta zuru oke nke usoro mmepụta polymer dị mkpa a.
Oge ozi: Eprel-10-2024