Hydroxyethyl cellulosebụ ihe dị mkpa sitere na cellulose. N'ihi uru dị n'ọtụtụ akụrụngwa akụrụngwa, nke enwere ike imeghari, ihe na-emebi emebi, nke na-adịghị egbu egbu, ịdị mma biocompatibility, na nnukwu mkpụrụ, nyocha na ntinye ya adọtala nlebara anya nke ukwuu. . Uru viscosity bụ ihe ndekọ arụmọrụ dị oke mkpa nke hydroxyethyl cellulose. N'akwụkwọ a, hydroxyethyl cellulose na viscosity uru n'elu 5 × 104mPa·s na ash uru na-erughị 0.3% kwadebere site mmiri mmiri-phase njikọ usoro site alkalization na etherification abụọ nzọụkwụ usoro.
Usoro alkalization bụ usoro nkwadebe nke alkali cellulose. N'akwụkwọ a, a na-eji ụzọ abụọ alkalization. Usoro nke mbụ bụ iji acetone dị ka ihe mgbaze. Akụrụngwa cellulose na-adabere ozugbo na ụfọdụ ntinye nke ngwọta mmiri sodium hydroxide. Mgbe emechara mmeghachi omume basification, a na-agbakwunye onye na-ahụ maka etherifying iji mee mmeghachi omume etherification ozugbo. Ụzọ nke abụọ bụ na cellulose raw material na-alkalized na mmiri mmiri ngwọta nke sodium hydroxide na urea, na alkali cellulose nke a kwadebere usoro a ga-squeezed iji wepụ ngafe lye tupu etherification mmeghachi omume. A na-enyocha cellulose alkali nke a kwadebere site na ụzọ dị iche iche site na infrared spectroscopy na mgbasa ozi X-ray. Dị ka njirimara nke ngwaahịa ndị a kwadebere site na mmeghachi omume etherification, a na-ekpebi usoro nhọrọ.
Iji chọpụta usoro nchịkọta etherification kacha mma, a na-enyocha usoro mmeghachi omume nke antioxidant, lye na glacial acetic acid na mmeghachi omume etherification mbụ. Mgbe ahụ mepụta usoro nnwale nke mmeghachi omume otu ihe, chọpụta ihe ndị na-enwe mmetụta dị ukwuu na arụmọrụ nke hydroxyethyl cellulose a kwadebere, ma jiri viscosity nke 2% aqueous solution nke ngwaahịa ahụ dị ka ihe ntụnye aka. Nsonaazụ nnwale na-egosi na ihe ndị dị ka ọnụọgụ diluent ahọpụtara, ọnụọgụ ethylene oxide agbakwunyere, oge alkalization, okpomọkụ na oge mmeghachi omume mbụ, okpomọkụ na oge mmeghachi omume nke abụọ niile nwere mmetụta dị ukwuu na arụmọrụ nke ngwaahịa. Edepụtara atụmatụ nnwale orthogonal nke nwere ihe asaa na ọkwa atọ, na ntụgharị mmetụta sitere na nsonaazụ nnwale nwere ike iji anya nyochaa isi ihe na nke abụọ yana mmetụta mmetụta nke ihe ọ bụla. Iji kwadebe ngwaahịa ndị nwere ụkpụrụ viscosity dị elu, a haziri atụmatụ nnwale kachasị mma, na atụmatụ kacha mma maka ịkwadebe hydroxyethyl cellulose bụ nke mechara kpebie site na nsonaazụ nnwale.
Njirimara nke a kwadebere elu-viscosityhydroxyethyl celluloseA na-enyocha ma nwalere, gụnyere mkpebi nke viscosity, ọdịnaya ash, nnyefe ọkụ, ọdịnaya mmiri, wdg, site na infrared spectroscopy, resonance magnetik, gas chromatography, X-ray diffraction, Thermogravimetric-differential thermal analysis na ụzọ njirimara ndị ọzọ na-eji. iji nyochaa na mara nhazi ngwaahịa ahụ, edo edo edo edo, ogo ngbanwe molar, crystallinity, thermal. nkwụsi ike, wdg. Ụzọ nnwale na-ezo aka na ụkpụrụ ASTM.
Hydroxyethyl cellulose, ihe dị mkpa sitere na cellulose, dọtara uche n'ihi nnukwu akụrụngwa akụrụngwa ya, nke enwere ike imeghari, ihe na-emebi emebi, nke na-adịghị egbu egbu, nke na-ekwekọghị na ya, na nnukwu mkpụrụ. Viscosity nke hydroxyethyl cellulose bụ ihe dị oke mkpa na-egosi arụmọrụ ya. Viscosity nke hydroxyethyl cellulose a kwadebere dị n'elu 5 × 104mPa·s, na ọdịnaya ntụ erughị 0.3%.
N'ime akwụkwọ a, a kwadebere hydroxyethyl cellulose dị elu-viscosity site na usoro njikọ mmiri-phase site na alkalization na etherification. Usoro alkalization bụ nkwadebe nke alkali cellulose. Họrọ n'ime ụzọ abụọ alkalization. Otu bụ na ihe cellulose na-agbanye ozugbo na acetone dị ka ihe na-eme ka mmiri dị na sodium hydroxide ngwọta, wee nweta mmeghachi omume etherification site na onye na-emepụta ihe. Nke ọzọ bụ na ihe cellulosic bụ alkalized na aqueous sodium hydroxide ngwọta na urea. A ghaghị iwepụ alkali nke dị na cellulose alkali tupu mmeghachi omume. N'akwụkwọ a, a na-amụ ihe dị iche iche alkali celluloses site na infrared spectroscopy na X-ray diffraction. N'ikpeazụ, a na-anabata usoro nke abụọ dịka njirimara nke ngwaahịa etherification si dị.
Iji chọpụta usoro nkwadebe nke etherification, a na-amụ usoro mmeghachi omume nke antioxidant, alkali na glacial acetic acid na usoro iri nri. Ekpebiri ihe ndị na-emetụta nkwadebe nke hydroxyethyl cellulose site na nnwale otu ihe. Dabere na viscosity uru nke ngwaahịa na 2% aqueous ngwọta. Nsonaazụ nnwale na-egosi na olu nke diluent, ọnụọgụ ethylene oxide, oge alkalization, okpomọkụ na oge nke mbụ na nke abụọ rehydration nwere mmetụta dị ukwuu na arụmọrụ ngwaahịa. A nabatara usoro ihe asaa na ọkwa atọ iji chọpụta ụzọ nkwadebe kacha mma.
Anyị na-enyocha njirimara nke njikerehydroxyethyl cellulose, gụnyere viscosity, ash, ìhè transmittance, mmiri, wdg The structural characterization, substituent homogeneity, nnọchi molarity, crystallinity na thermal kwụsie ike e atụle site infrared, nuklia magnetik resonance, gas chromatography, X-ray diffraction, DSC na DAT, na na usoro ule nakweere ụkpụrụ ASTM.
Oge nzipu: Eprel-25-2024