Cellulose ether bụ ihe mgbakwunye dị mkpa maka ihe owuwu ụlọ, nke a na-ejikarị eme ihe n'ụlọ mposi, ntụ ntụ putty, mkpuchi na ngwaahịa ndị ọzọ iji melite ihe onwunwe anụ ahụ na arụmọrụ owuwu nke ihe ahụ. Ihe ndị bụ isi dị na cellulose ether gụnyere nhazi ntọala cellulose na ihe ndị na-anọchi anya ya site na mgbanwe kemịkalụ, nke na-enye ya ike ịgbaze, ịka nká, idobe mmiri na ihe ndị na-eme ka ọ dị nro pụrụ iche.
1. Nhazi isi nke cellulose
Cellulose bụ otu n'ime polysaccharides kachasị na okike, nke sitere na eriri osisi. Ọ bụ isi ihe dị na cellulose ether ma na-ekpebi nhazi na ihe onwunwe ya. Mkpụrụ ndụ cellulose mejupụtara nkeji glucose jikọtara site na njikọ β-1,4-glycosidic iji mepụta nhazi ogologo agbụ. Nhazi ahịrị a na-enye cellulose ike dị elu na ibu molekul dị elu, mana ọ naghị agbaze na mmiri. Iji melite mmiri nke cellulose ma mee ka ọ dị mma ma kwekọọ na mkpa nke ihe owuwu, ọ dị mkpa ka a gbanwee cellulose site na kemịkalụ.
2. Ihe nnọchi - ihe ndị dị mkpa nke mmeghachi omume etherification
Ihe pụrụ iche nke cellulose ether na-esi na ihe ndị e tinyere n'ime selulose pụta bụ ihe ndị e tinyere n'ime selulose site na mmeghachi omume etherification dị n'etiti otu hydroxyl (-OH) nke cellulose na ihe ndị ether. Ihe ndị a na-ejikarị eme ihe gụnyere methoxy (-OCH₃), ethoxy (-OC₂H₅) na hydroxypropyl (-CH₂CHOHCH₃). Ntinye nke ihe ndị a na-agbanwe ike ịgbaze, ịka nká na idobe mmiri nke cellulose. Dịka ihe ndị dị iche iche ewebatara si dị, enwere ike kewaa cellulose ethers ka ọ bụrụ methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl methyl cellulose (HPMC) na ụdị ndị ọzọ.
Methyl cellulose (MC): A na-emepụta Methyl cellulose site n'itinye ihe ndị na-anọchi methyl (-OCH₃) n'ime otu hydroxyl dị na molekul cellulose. Cellulose ether a nwere ezigbo mmiri na-agbaze ma na-eme ka ọ sie ike, a na-ejikwa ya nke ọma na moto akọrọ, ihe na-eme ka ọ dị nro na ihe mkpuchi. MC nwere ezigbo nchekwa mmiri ma na-enyere aka belata mfu mmiri na ihe owuwu, na-ahụ na moto na ntụ ntụ putty na-arapara na ike.
Hydroxyethyl cellulose (HEC): A na-emepụta Hydroxyethyl cellulose site n'itinye ihe ndị na-agbanwe hydroxyethyl (-OC₂H₅), nke na-eme ka ọ dịkwuo mmiri mmiri ma na-eguzogide nnu. A na-ejikarị HEC eme ihe na mkpuchi mmiri, agba latex na ihe mgbakwunye ụlọ. O nwere ezigbo ihe ndị na-eme ka ihe sie ike ma na-akpụ ihe nkiri ma nwee ike ime ka arụmọrụ owuwu nke ihe ndị ahụ ka mma nke ukwuu.
Hydroxypropyl methylcellulose (HPMC): A na-emepụta Hydroxypropyl methylcellulose site na ntinye hydroxypropyl (-CH₂CHOHCH₃) na ihe ndị ọzọ dị na methyl n'otu oge. Ụdị cellulose ether a na-egosipụta ezigbo njigide mmiri, mmanu na ọrụ dị mma na ihe owuwu dịka ngwa agha akọrọ, ihe nrapado taịlị, na sistemụ mkpuchi mgbidi mpụta. HPMC nwekwara ezigbo iguzogide okpomọkụ na iguzogide ntu oyi, yabụ ọ nwere ike imeziwanye arụmọrụ nke ihe owuwu n'okpuru ọnọdụ ihu igwe dị oke njọ.
3. Mmiri na-agbaze ma na-eme ka ọ sie ike
Mmiri nke cellulose ether na-agbaze dabere n'ụdị na ogo nnọchi nke ihe nnọchi (ya bụ, ọnụọgụ nke otu hydroxyl e tinyere na nkeji glucose ọ bụla). Ogo kwesịrị ekwesị nke nnọchi na-eme ka molekul cellulose nwee ike ịmepụta otu ngwọta n'ime mmiri, na-enye ihe ahụ ezigbo ihe onwunwe nke ịdị arọ. N'ihe owuwu ụlọ, cellulose ethers dị ka ihe ndị na-eme ka ihe sie ike nwere ike ime ka viscosity nke ihe owuwu dịkwuo elu, gbochie nhazi na nkewa nke ihe, ma si otú a melite arụmọrụ owuwu.
4. Idochi mmiri
Mmiri nke cellulose ether dị oke mkpa maka ịdị mma nke ihe owuwu ụlọ. N'ihe ndị dị ka moto na ntụ ntụ putty, cellulose ether nwere ike ịmepụta ihe mkpuchi mmiri dị oke n'elu ihe ahụ iji gbochie mmiri ịpụ ngwa ngwa, si otú a na-agbatị oge mepere emepe na ike nke ihe ahụ. Nke a na-arụ ọrụ dị mkpa n'ime ka ike njikọ dịkwuo mma ma gbochie mgbawa.
5. Rheology na arụmọrụ owuwu
Mgbakwunye nke cellulose ether na-eme ka ihe owuwu ụlọ dịkwuo mma nke ukwuu, ya bụ, mmụba na mgbanwe nke ihe ndị dị n'okpuru ike mpụga. Ọ nwere ike ime ka njigide mmiri na mmanụ dị n'ime ngwa agha dịkwuo mma, mee ka ike ịmịpụta ihe na ịdị mfe nke ihe owuwu dịkwuo mma. N'ime usoro owuwu dịka ịgba mmiri, ịkpụcha na ịkpụcha ihe, cellulose ether na-enyere aka belata iguzogide ma melite arụmọrụ ọrụ, ebe ọ na-ahụ na mkpuchi otu ihe na-enweghị ịda ada.
6. Ndakọrịta na nchekwa gburugburu ebe obibi
Cellulose ether nwere ezigbo ndakọrịta na ọtụtụ ihe owuwu ụlọ, gụnyere simenti, gypsum, lime, wdg. N'oge usoro owuwu ahụ, ọ gaghị emeghachi omume na ihe ndị ọzọ metụtara kemịkalụ iji hụ na ihe ahụ kwụsiri ike. Na mgbakwunye, cellulose ether bụ ihe mgbakwunye akwụkwọ ndụ akwụkwọ ndụ na nke na-adịghị emebi gburugburu ebe obibi, nke sitere na eriri osisi eke, ọ naghị emerụ gburugburu ebe obibi ahụ, ma na-emezu ihe achọrọ maka nchekwa gburugburu ebe obibi nke ihe owuwu ọgbara ọhụrụ.
7. Ihe ndị ọzọ emezigharịrị
Iji mee ka arụmọrụ nke cellulose ether ka mma, enwere ike itinye ihe ndị ọzọ emezigharịrị na mmepụta n'ezie. Dịka ọmụmaatụ, ụfọdụ ndị nrụpụta ga-eme ka iguzogide mmiri na iguzogide ihu igwe nke cellulose ether dịkwuo mma site na iji silicone, paraffin na ihe ndị ọzọ. Mgbakwunye nke ihe ndị a emezigharịrị na-abụkarị iji mezuo ihe achọrọ maka ojiji, dị ka ịbawanye mgbochi na-adịgide adịgide nke ihe ahụ na mkpuchi mgbidi mpụta ma ọ bụ ngwa agha mmiri na-adịghị.
Dịka ihe dị mkpa n'ihe owuwu ụlọ, cellulose ether nwere ihe ndị dị iche iche na-arụ ọrụ, gụnyere ịka nká, idobe mmiri, na ime ka rheological dịkwuo mma. Ihe ndị bụ isi dị na ya bụ nhazi ntọala cellulose na ihe ndị e tinyere n'ime ya site na mmeghachi omume etherification. Ụdị cellulose ether dị iche iche nwere ngwa na arụmọrụ dị iche iche na ihe owuwu n'ihi ọdịiche dị na ihe ndị e tinyere n'ime ha. Cellulose ethers nwere ike ọ bụghị naanị ime ka arụmọrụ owuwu nke ihe dịkwuo mma, kamakwa ime ka mma na ndụ ọrụ nke ụlọ dịkwuo mma. Ya mere, cellulose ethers nwere atụmanya sara mbara maka ihe owuwu nke oge a.
Oge ozi: Sep-18-2024