Kemgbe mmalite e ji esiji ihe na-eme ihe na narị afọ gara aga, sodium alginate (SA) bụ ihe bụ́ isi a na-ebipụta n'ákwà owu.
mado. Agbanyeghị, na mmụba na-aga n'ihu nke ihe ndị mmadụ chọrọ maka nsonaazụ mbipụta, sodium alginate dị ka tapawa mbipụta anaghị eguzogide acid siri ike na alkali.
Na viscosity nhazi dị ntakịrị, ya mere ngwa ya na mbipụta ihuenyo okirikiri (flat) na-ejedebe ruo n'ókè ụfọdụ;
Ọnụ ego sodium alginate na-arị elu, ya mere ndị mmadụ amalitela nyocha banyere ihe ndị ọzọ, cellulose ether bụ otu n'ime ihe ndị dị mkpa.
ụdị. Ma ugbu a, isi ihe eji akwadebe cellulose ether bụ owu, mmepụta ya na-ebelata, ọnụ ahịa na-abawanye.
Ọzọkwa, ihe etherifying ndị a na-ejikarị eme ihe dị ka chloroacetic acid (nke na-egbu egbu) na ethylene oxide (carcinogenic) na-emerụkwa ahụ mmadụ na gburugburu ebe obibi.
N'ihi nke a, n'ime akwụkwọ a, a na-ewepụta cellulose ether site na mkpofu osisi, na sodium chloroacetate na 2-chloroethanol na-eji dị ka ihe na-emepụta ihe na-edozi carboxylate.
Ụdị atọ nke eriri: methyl cellulose (CMC), hydroxyethyl cellulose (HEC) na hydroxyethyl carboxymethyl cellulose (HECMC)
atọcellulose ethersna SA etinyere na owu ákwà reactive dye obibi akwụkwọ, na ha na-ebi akwụkwọ mmetụta tụnyere na mụọ.
mkpụrụ osisi. E kewara isi ihe nchọcha dị na tesis ahụ ụzọ atọ:
(1) Wepụ cellulose n'ime ihe mkpofu osisi. Site na ọgwụgwọ nke ahịhịa ise (osikapa ahịhịa, osikapa husk, ọka wit, pine sawdust).
na bagasse) maka mkpebi siri ike na nyocha nke components (mmiri, ash, lignin, cellulose na hemicellulose), họrọ.
A na-eji ihe ọkụkụ atọ na-anọchite anya osisi (osisi pine, ahịhịa ọka na bagasse) wepụ cellulose, na-amịpụta cellulose.
E mere ka usoro ahụ dịkwuo mma; N'okpuru usoro kachasị mma, a na-enweta akụkụ nke pine cellulose, cellulose ọka wit na bagasse cellulose.
Ịdị ọcha dị n'elu 90%, na mkpụrụ dị n'elu 40%; enwere ike ịhụ ya site na nyocha nke infrared spectrum na ultraviolet absorption spectrum na adịghị ọcha.
A na-ewepụ lignin na hemicellulose, na cellulose enwetara nwere ịdị ọcha dị elu; enwere ike ịhụ ya site na nyocha diffraction X-ray na ọ dị ka ihe ọkụkụ.
N'iji ya tụnyere, kristal ikwu nke ngwaahịa enwetara na-akawanye mma.
(2) Nkwadebe na njirimara nke cellulose ethers. N'iji cellulose osisi pine ewepụtara site na sawdust pine dị ka akụrụngwa, e mere nnwale otu ihe.
The ndọpụ alkali decrystallisation pretreatment usoro nke pine cellulose bụ kacha; na site n'ichepụta orthogonal nnwale na otu-akpata nnwale, ndị
Usoro maka ịkwadebe CMC, HEC na HECMC sitere na osisi pine alkali cellulose bụ nke kachasị mma;
CMC nwere DS ruo 1.237, HEC nwere MS ruo 1.657, na HECMC nwere DS nke 0.869 nwetara. Dị ka nyocha FTIR na H-NMR si kwuo, e webatara otu ether ndị kwekọrọ na ngwaahịa etherification cellulose atọ;
Ụdị kristal nke plain ethers CMC, HEC na HEECMC niile gbanwere na ụdị cellulose II, na crystallinity belatara nke ukwuu.
(3) Ngwa nke cellulose ether tapawa. A na-eji ụdị cellulose ethers atọ a kwadebere n'okpuru ọnọdụ usoro kachasị mma maka akwa owu
Ebipụtara ya na ihe na-esiji ihe na-emeghachi omume ma jiri ya tụnyere sodium alginate. Nnyocha ahụ chọpụtara na SA, CMC, HEC na HECMC anọ na-akpata
The pastes niile bụ pseudoplastic fluids, na pseudoplasticity nke atọ cellulose ethers dị mma karịa nke SA; usoro nke mado guzobe ọnụego nke anọ mado
Ọ bụ: SA> CMC> HECMC> HEC. N'ihe gbasara mbipụta mbipụta, CMC pụtara agba mkpụrụ na ntinye, aka obibi akwụkwọ
Sensitivity, ebipụta agba ngwa ngwa, wdg yiri SA, na depaste ọnụego nke CMC dị mma karịa SA;
SA yiri nke ahụ, mana HEC pụtara ìhè mkpụrụ mkpụrụ, permeability na rubbing ngwa ngwa dị ala karịa SA; HECMC ebipụta mmetụta, ete iguzogide
Ngwa ngwa agba na-ehichapụ dị ka SA, na nkwụsị nke mado dị elu karịa SA, mana mkpụrụ nke agba agba na nkwụsi ike nke HEECMC dị ala karịa SA.
Isi okwu: ihe mkpofu osisi; cellulose; cellulose ether; mgbanwe etherification; mbipụta agba agba na-emeghachi omume;
Oge nzipu: Sep-26-2022