Hydroxypropylcellulose (HEC) bụ ihe sitere na cellulose, polymer eke dị na mgbidi cell osisi.A na-eji HPC eme ihe n'ọtụtụ ụlọ ọrụ dị iche iche dị ka ọgwụ, ihe ịchọ mma na ụlọ ọrụ nri n'ihi imepụta ihe nkiri na ihe na-eme ka ọ dị mma.Njikọ nke hydroxypropylcellulose gụnyere ọtụtụ usoro na usoro ahụ nwere ike ịdị mgbagwoju anya.
Okwu mmalite nke hydroxypropylcellulose:
1. Iji cellulose dị ka mmalite ihe:
Isi mmalite nke cellulose bụ ihe ọkụkụ dị ka pulp osisi ma ọ bụ owu.Cellulose bụ polymer linear nke mejupụtara nkeji glucose jikọtara ya na njikọ β-1,4-glycosidic.Ọ nwere oke polymerization, yana ọtụtụ puku nkeji glucose na-akpụ agbụ ogologo.
2. Mmeghachi omume etherification:
Njikọ nke hydroxypropylcellulose gụnyere iwebata otu hydroxypropyl n'ime ọkpụkpụ azụ cellulose site na etherification.Mmeghachi omume a na-agụnyekarị iji propylene oxide dị ka onye na-ahụ maka alkylating.
Cellulose + propylene oxide → alkali-catalyzed hydroxypropyl cellulose + ngwaahịa cellulose + propylene oxide alkali-catalyzed hydroxypropyl cellulose + site-ngwaahịa
Isi catalysis dị mkpa iji kwalite mmeghachi omume n'etiti otu cellulose hydroxyl na propylene oxide.A na-eme usoro a n'okpuru ọnọdụ a na-achịkwa iji hụ na ngbanwe achọrọ (DS) nke otu hydroxypropyl na agbụ cellulose.
3. Hydroxypropylation:
Hydroxypropylation gụnyere mgbakwunye nke otu hydroxypropyl na ọkpụkpụ azụ cellulose.Mgbanwe a na-eme ka ọ dịkwuo mma na ihe ndị ọzọ a na-achọsi ike na polymer cellulosic.A na-ejikwa nlezianya na-achịkwa ọnọdụ mmeghachi omume, gụnyere okpomọkụ, nrụgide na oge mmeghachi omume iji nweta njirimara ngwaahịa achọrọ.
4. Ọgwụgwọ Alkali:
Mgbe hydroxypropylation gasịrị, a na-ejikarị ọgwụgwọ alkaline mee ihe iji kpochapụ adịghị ọcha acid ọ bụla fọdụrụnụ ma mezie pH nke ngwakọta mmeghachi omume.Nzọụkwụ a dị oké mkpa maka usoro nchacha na-esote.
5. Usoro nchacha:
Mgbe mmeghachi omume etherification gasịrị, a na-eme ọtụtụ usoro nchacha iji nweta hydroxypropylcellulose dị ọcha.Usoro ndị a nwere ike ịgụnye:
Na-asa: saa ngwakọta mmeghachi omume iji wepụ ihe ndị fọdụrụnụ, ihe ndị na-emepụta ihe na cellulose na-emeghị eme.
Filtration: A na-eji nzacha kewapụ ihe adịghị ọcha siri ike na ngwakọta mmeghachi omume.
ihicha: A na-akpọzi hydroxypropyl cellulose dị mmiri iji wepụ mmiri ọ bụla fọdụrụnụ.
6. njikwa arọ nke molikula:
Enwere ike ịchịkwa ịdị arọ nke hydroxypropylcellulose n'oge njikọ iji kwado njirimara ya na ngwa ndị akọwapụtara.A na-enweta nke a site n'ịgbanwe ọnọdụ mmeghachi omume, dị ka ọnụọgụ nke reagents na oge mmeghachi omume.
Mmepụta ụlọ ọrụ:
1. Usoro na-adịte aka ma ọ bụ na-aga n'ihu:
Enwere ike ịme mmepụta nke hydroxypropyl cellulose na nhazi ma ọ bụ na-aga n'ihu.Usoro nhazi ahụ dabara adaba maka mmepụta obere obere, ebe usoro na-aga n'ihu na-adaba adaba maka mmepụta ihe dị ukwuu.
2. njikwa mma:
A na-emejuputa usoro njikwa mma n'oge ọ bụla nke usoro mmepụta iji hụ na ịdị ọcha na ịdị ọcha nke ngwaahịa ikpeazụ.A na-eji usoro nyocha dị ka chromatography, spectroscopy na rheological ọmụmụ iji nyochaa isi ihe dị ka ogo nke nnọchi, ịdị arọ molecular na ịdị ọcha.
Ngwa nke Hydroxypropyl Cellulose:
1. Ụlọ ọrụ na-emepụta ọgwụ:
A na-eji Hydroxypropylcellulose eme ihe n'ọtụtụ ebe na nkwadebe ọgwụ dị ka ihe nkedo, nke na-agbasa na onye na-achịkwa ntọhapụ.Ndakọrịta ya na ụdị ọgwụ dịgasị iche iche na inertness ya na-eme ka ọ bụrụ ihe pụrụ iche.
2. Ụlọ ọrụ ịchọ mma:
N'ụlọ ọrụ ịchọ mma, a na-eji hydroxypropylcellulose na-emepụta ngwaahịa nlekọta ntutu isi, ude anụ ahụ na ngwaahịa nlekọta onwe onye ndị ọzọ.Ihe ndị na-emepụta ihe nkiri ya na-eme ka ọ baa uru na ngwaahịa nlekọta ntutu isi.
3. Ụlọ ọrụ nri:
N'ime ụlọ ọrụ nri, a na-eji hydroxypropylcellulose mee ihe dị ka onye na-eme ihe na-ekpo ọkụ na gelling.A na-achọta ya n'ụdị nri dị iche iche ma na-enyere aka melite ọdịdị na nkwụsi ike ha.
Njikọ nke hydroxypropylcellulose gụnyere etherification nke cellulose site na mgbakwunye nke otu hydroxypropyl.A na-emekarị mmeghachi omume site na ntọala, na-esote usoro nchacha iji nweta ngwaahịa dị oke ọcha.Enwere ike ịrụpụta mmepụta ụlọ ọrụ site na batch ma ọ bụ na-aga n'ihu na usoro njikwa mma siri ike.Hydroxypropylcellulose nwere ngwa dịgasị iche iche na ụlọ ọrụ ọgwụ, ịchọ mma na nri n'ihi ihe pụrụ iche ya na ike ya.Ọganihu na-aga n'ihu nke usoro mmepụta na mmepe nke ngwa ọhụrụ na-emesi ike
Oge nzipu: Dec-26-2023