Hydroxypropyl methylcellulose (HPMC) bụ polymer nke na-eme ka mmiri na-edozi mmiri nke ọkara nke a na-ejikarị eme ihe na ụlọ ọrụ ọgwụ, ihe owuwu na nri, n'etiti ndị ọzọ. A na-enweta ya site na cellulose, polymer eke dị na mgbidi cell osisi. Ihe na-esonụ bụ ntụle n'ozuzu nke usoro mmepụta HPMC:
Isi mmalite nke cellulose:
Isi akụrụngwa maka mmepụta HPMC bụ cellulose, nke enwere ike nweta ya site na osisi pulp ma ọ bụ akwa akwa. Mkpụrụ osisi bụ ihe a na-ahụkarị n'ihi na ọ na-aba ụba ma na-akwụ ụgwọ.
Ọgwụgwọ Alkali:
A na-eji ihe alkali (na-emekarị sodium hydroxide) agwọ cellulose iji wepụ adịghị ọcha na hemicellulose. Usoro a, nke a na-akpọ mercerization, na-emepụta cellulose dị ọcha.
Etherification:
A na-edobe cellulose dị ọcha na etherification, mmeghachi omume kemịkalụ nke na-ewebata otu ether n'ime ọkpụkpụ cellulose. Maka HPMC, a na-ewebata ma hydroxypropyl na otu methyl na molekul cellulose.
Hydroxypropylation:
A na-eji propylene oxide ewebata otu hydroxypropyl n'ime cellulose. Nzọụkwụ a na-agụnye mmeghachi omume nke propylene oxide na cellulose n'ihu onye na-eme ihe.
Methylation:
A na-ewebata otu methyl n'ime cellulose hydroxypropylated site na iji methyl chloride ma ọ bụ dimethyl sulfate. A na-akpọ nzọụkwụ a methylation.
Na-anọpụ iche na ịsa:
Mgbe mmeghachi omume etherification gasịrị, a na-ewepụ ngwaahịa ahụ iji wepụ isi ihe ọ bụla fọdụrụnụ. A na-asachakwa HPMC nke a na-esi na ya pụta iji wepụ ngwaahịa na kemịkalụ na-emeghị eme.
ihicha:
Nzọụkwụ ikpeazụ gụnyere ihicha HPMC iji wepụ oke mmiri wee nweta ngwaahịa achọrọ n'ụdị ntụ ntụ ma ọ bụ granular.
Ọ dị mkpa iburu n'obi na nkọwa nkọwa nke usoro mmepụta nwere ike ịdịgasị iche n'etiti ndị na-emepụta ihe, ha nwere ike iji ọnọdụ dị iche iche, ihe ndị na-emepụta ihe, na reagents iji nweta ọrụ HPMC chọrọ. Tụkwasị na nke a, a na-emejuputa usoro njikwa mma n'oge usoro mmepụta ahụ iji hụ na nkwekọ na ịdị ọcha nke ngwaahịa ikpeazụ.
Oge nzipu: Nov-24-2023