Mmetụta nke ime ka ọkpụrụkpụ nkecellulose etherdabere na: ogo nke polymerization nke cellulose ether, ntinye nke ngwọta, ọnụego shear, okpomọkụ na ọnọdụ ndị ọzọ. Njirimara gelling nke ngwọta ahụ pụrụ iche na alkyl cellulose na ihe ndị e mepụtara ya. Njirimara gelation metụtara ogo nnọchi, ntinye nke ngwọta na ihe mgbakwunye. Maka ihe ndị e mepụtara hydroxyalkyl, njirimara gel ahụ na-ejikọkwa na ogo mgbanwe nke hydroxyalkyl. Maka obere viscosity MC na HPMC, enwere ike ịkwadebe ngwọta 10%-15%, enwere ike ịkwadebe viscosity ọkara MC na HPMC ngwọta 5%-10%, yana viscosity dị elu MC na HPMC nwere ike ịkwadebe naanị ngwọta 2%-3%, a na-ejikwa ngwọta viscosity nke cellulose ether ọkwa 1%-2%.
Ether cellulose dị arọ nke nwere oke molekul nwere oke thickening, polima nwere oke molekul dị iche iche nwere viscosities dị iche iche n'otu ngwọta ntinye. Enwere ike inweta viskele ebumnuche naanị site na ịgbakwunye nnukwu molekul ether dị obere. viskele ya anaghị adabere na ọnụego nhazi, viskele dị elu na-eru viskele ebumnuche, na-achọ obere mgbakwunye, viskele dabere na arụmọrụ thickene. Ya mere, iji nweta otu nkwekọ, a ga-enwerịrị nkwa na a ga-enwe ụfọdụ cellulose ether (ntinye nke ngwọta) na viskele ngwọta. Okpomọkụ gel nke ngwọta ahụ na-ebelatakwa n'usoro ka mmụba nke ntinye nke ngwọta ahụ, na gels na okpomọkụ ụlọ mgbe ọ ruru ụfọdụ njupụta. Ngụkọta gelling nke HPMC dị elu na okpomọkụ ụlọ.
Enwere ike ịgbanwe nkwekọ site n'ịhọrọ nha ihe dị n'ime ya na ịhọrọ ethers cellulose nwere ọkwa mgbanwe dị iche iche. Ihe a na-akpọ mgbanwe bụ iwebata ụfọdụ ọkwa nnọchi nke otu hydroxyalkyl na nhazi ọkpụkpụ nke MC. Site n'ịgbanwe ụkpụrụ nnọchi anya nke ihe abụọ ahụ, ya bụ, ụkpụrụ nnọchi anya DS na MS nke otu methoxy na hydroxyalkyl nke anyị na-ekwukarị. Enwere ike nweta ihe dị iche iche achọrọ maka arụmọrụ nke cellulose ether site na ịgbanwe ụkpụrụ nnọchi anya nke ihe abụọ ahụ.
Mmiri mmiri cellulose ether cellulose nwere nnukwu thixotropy, nke bụkwa ihe dị mkpa na cellulose ether. Mmiri mmiri nke MC polymers na-enwekarị mmiri pseudoplastic na nke na-abụghị thixotropic n'okpuru okpomọkụ gel ha, mana ihe ndị Newtonian na-asọ na obere ọnụego shear. Pseudoplasticity na-abawanye ka molekul dị arọ ma ọ bụ njupụta nke cellulose ether, n'agbanyeghị ụdị ihe nnọchi na ogo nke nnọchi. Ya mere, cellulose ethers nke otu ọkwa viscosity, n'agbanyeghị MC, HPMC, HEMC, ga-egosipụta otu ihe ndị ahụ ma ọ bụrụhaala na a na-anọgide na-etinye njupụta na okpomọkụ. A na-emepụta gels nhazi mgbe a na-ebuli okpomọkụ, mmiri thixotropic na-apụtakwa. Mmiri dị elu na obere viscosity cellulose ethers na-egosi thixotropy ọbụna n'okpuru okpomọkụ gel. Ihe onwunwe a bara uru nke ukwuu na nhazi nke ọkwa na ịla n'iyi na owuwu nke ụlọ ngwa agha.
Ọ dị mkpa ka a kọwaa ebe a na oke viscosity nkecellulose ether, ka njigide mmiri ka mma, mana ka viscosity dị elu, otú ahụ ka ibu molekul nke cellulose ether dị elu, na mbelata kwekọrọ na ya na ike ịgbaze ya, nke nwere mmetụta ọjọọ na ntinye moto na arụmọrụ owuwu. Ka viscosity dị elu, otú ahụ ka mmetụta ọkpụrụkpụ ya na moto ahụ na-apụta ìhè, mana ọ bụghị nke zuru oke. Ụfọdụ viscosity dị ọkara na nke dị ala, mana cellulose ether emezigharịrị nwere arụmọrụ ka mma n'imeziwanye ike nhazi nke moto mmiri. Ka viscosity na-abawanye, njigide mmiri nke cellulose ether na-aka mma.
Oge ozi: Eprel-28-2024