Ịmepụta hydroxyethyl cellulose (HEC) gụnyere usoro mmeghachi omume kemịkalụ iji gbanwee cellulose, polymer eke sitere na osisi. A na-eji HEC eme ihe n'ọtụtụ ụlọ ọrụ dị iche iche, gụnyere ọgwụ, ihe ịchọ mma, nri, na ihe owuwu, n'ihi na ọ na-eme ka ọ dịkwuo arọ, na-eme ka ọ dị ike, na-ejigide mmiri.
Okwu Mmalite nke Hydroxyethyl Cellulose (HEC)
Hydroxyethyl cellulose (HEC) bụ ihe na-abụghị ionic, mmiri-soluble polymer nke sitere na cellulose site na mgbanwe kemịkalụ. A na-ejikarị ya eme ihe dị ka ihe na-agbapụta, gelling na stabilizing n'ụlọ ọrụ dị iche iche.
Ngwaọrụ
Cellulose: Isi akụrụngwa maka mmepụta HEC. Enwere ike nweta cellulose site na ihe ọkụkụ dị iche iche dị ka osisi pulp, owu, ma ọ bụ ihe fọdụrụ n'ubi.
Ethylene Oxide (EO): Otu kemịkalụ bụ isi eji ewebata otu hydroxyethyl n'ime ọkpụkpụ azụ cellulose.
Alkali: A na-ejikarị sodium hydroxide (NaOH) ma ọ bụ potassium hydroxide (KOH) mee ihe dị ka ihe na-akpali akpali na mmeghachi omume.
Usoro nrụpụta
Mmepụta nke HEC gụnyere etherification nke cellulose na ethylene oxide n'okpuru ọnọdụ alkaline.
Usoro ndị a na-akọwapụta usoro a:
1. Tupu ọgwụgwọ nke Cellulose
A na-ebu ụzọ mee ka cellulose dị ọcha iji wepụ adịghị ọcha dị ka lignin, hemicellulose, na ihe ndị ọzọ. A na-akpọzi cellulose dị ọcha ka ọ bụrụ ọdịnaya mmiri.
2. Mmeghachi omume Etherification
Nkwadebe nke Ngwọta Alkaline: A na-akwado ngwọta mmiri nke sodium hydroxide (NaOH) ma ọ bụ potassium hydroxide (KOH). Ntinye uche nke ngwọta alkali dị oke egwu ma ọ dị mkpa ka emeziwanye ya dabere na ogo achọrọ nke nnọchi (DS) nke ngwaahịa ikpeazụ.
Ntọala mmeghachi omume: cellulose dị ọcha na-agbasasị na ngwọta alkali. A na-ekpokọta ngwakọta ahụ na okpomọkụ dị iche iche, ọ na-adịkarị gburugburu 50-70 ° C, iji hụ na cellulose na-agbaze kpamkpam na ịnweta maka mmeghachi omume ahụ.
Mgbakwunye nke Ethylene Oxide (EO): Ethylene oxide (EO) na-agbakwunye nwayọọ nwayọọ na arịa mmeghachi omume mgbe ọ na-ejigide okpomọkụ ma na-akpali akpali. Mmeghachi omume ahụ bụ exothermic, ya mere njikwa okpomọkụ dị oké mkpa iji gbochie ikpo ọkụ.
Nleba anya mmeghachi omume: A na-enyocha ọganihu nke mmeghachi omume site na nyocha ihe nlele n'oge oge. Enwere ike iji usoro dị ka Fourier-transform infrared spectroscopy (FTIR) iji chọpụta ogo nnọchi (DS) nke otu hydroxyethyl na ọkpụkpụ azụ cellulose.
Nnọpụiche na ịsa: Ozugbo enwetara DS a chọrọ, a na-emenyụ mmeghachi omume ahụ site na iji acid na-ewepụ ihe ngwọta alkaline, nke na-abụkarị acetic acid. A na-eji mmiri na-asachapụ nke ọma HEC nke ọma iji wepụ ihe ọ bụla reagents na adịghị ọcha.
3. Ịdị ọcha na ihicha
A na-asachapụ HEC a na-asacha site na nzacha ma ọ bụ centrifugation iji wepụ ihe ọ bụla na-adịghị ọcha. A na-akpọzi HEC dị ọcha ka ọ bụrụ ọdịnaya mmiri dị iche iche iji nweta ngwaahịa ikpeazụ.
Njikwa ogo
Njikwa mma dị mkpa n'oge usoro mmepụta HEC iji hụ na ịdị ọcha na ịdị ọcha nke ngwaahịa ikpeazụ. Isi paramita iji nyochaa gụnyere:
Ogo nnọchi anya (DS)
Viscosity
Ọdịnaya nke mmiri
pH
Ịdị ọcha (enweghị ihe adịghị ọcha)
A na-ejikarị usoro nyocha dị ka FTIR, nha viscosity, na nyocha elemental maka njikwa mma.
Ngwa nke Hydroxyethyl Cellulose (HEC)
HEC na-achọta ngwa n'ime ụlọ ọrụ dị iche iche n'ihi njirimara ya dị iche iche:
Ọgwụ: A na-eji ya dị ka ihe na-eme ka ọ sie ike na nkwusioru ọnụ, nhazi ihe na usoro nnyefe ọgwụ na-achịkwa.
Ihe ịchọ mma: A na-ejikarị ude, lotions, na shampoos eme ihe dị ka ihe na-esikwu ike na nkwụsi ike.
Nri: Agbakwunyere na ngwaahịa nri dị ka ihe na-eme ka ọ sie ike na gelling, emulsifier, na stabilizer.
Ihe owuwu: Ejiri ya na ụrọ na grouts sitere na ciment iji meziwanye arụmọrụ na njide mmiri.
Ihe gbasara gburugburu na nchekwa
Mmetụta gburugburu ebe obibi: Mmepụta nke HEC gụnyere iji kemịkalụ dị ka ethylene oxide na alkalis, nke nwere ike inwe mmetụta gburugburu ebe obibi. Ijikwa ihe mkpofu kwesịrị ekwesị na ịgbaso ụkpụrụ dị mkpa iji belata mmetụta gburugburu ebe obibi.
Nchekwa: Ethylene oxide bụ gas na-arụ ọrụ nke ukwuu ma na-ere ọkụ, na-ebute ihe egwu nchekwa n'oge njikwa na nchekwa. Ikuku ikuku zuru oke, akụrụngwa nchedo onwe onye (PPE), na usoro nchekwa dị mkpa iji hụ na nchekwa ndị ọrụ.
Hydroxyethyl cellulose (HEC) bụ polymer bara uru nke nwere ngwa dị iche iche na ụlọ ọrụ sitere na ọgwụ na-ewu ụlọ. Mmepụta ya gụnyere etherification nke cellulose na ethylene oxide n'okpuru ọnọdụ alkaline. Usoro njikwa ogo dị oke mkpa iji hụ na nkwekọ na ịdị ọcha nke ngwaahịa ikpeazụ. Ekwesịrị ileba anya n'ihe gbasara gburugburu ebe obibi na nchekwa n'oge usoro mmepụta. Site n'ịgbaso usoro na ụkpụrụ kwesịrị ekwesị, HEC nwere ike ịmepụta nke ọma mgbe ọ na-ebelata mmetụta gburugburu ebe obibi ma hụ na nchekwa ndị ọrụ.
Ntuziaka a zuru oke na-ekpuchi usoro mmepụta nke hydroxyethyl cellulose (HEC) n'ụzọ zuru ezu, site na akụrụngwa na njikwa mma na ngwa, na-enye nghọta zuru oke nke usoro mmepụta polymer a dị mkpa.
Oge nzipu: Eprel-10-2024