Site na nyocha na nchịkọta nke nsonaazụ ule cellulose ether na isiakwụkwọ atọ ahụ, nkwubi okwu bụ isi bụ ndị a:
5.1 Mmechi
1. Cellulose ether mmịpụta site na ihe ọkụkụ
(1) A tụrụ ihe ndị mejupụtara ihe ọkụkụ ise (mmiri, ash, àgwà osisi, cellulose na hemicellulose), na-ahọrọ ihe ọkụkụ atọ na-anọchi anya ya, sawdust pine na ọka wit.
na bagasse iji wepụta cellulose, na usoro nke mmịpụta cellulose bụ nke kachasị mma. N'okpuru usoro kachasị mma, ihe
Ịdị ọcha nke lignocellulose, ọka ọka wit cellulose na bagasse cellulose dị elu karịa 90%, ihe ha na-amịpụta dị elu karịa 40%.
(2) Site na nyocha nke ụdị infrared dị iche iche, enwere ike ịhụ na mgbe ọgwụgwọ gasịrị, ngwaahịa cellulose na-esi na ọka wit, bagasse na pine sawdust amịpụtara.
Na 1510 cm-1 (skeletal vibration nke benzene mgbanaka) na gburugburu 1730 cm-1 (na-agbatị vibration absorption nke na-abụghị conjugated carbonyl C = O)
Enweghị ọnụ ọgụgụ dị elu, na-egosi na lignin na hemicellulose dị na ngwaahịa a na-amịpụta bụ isi wepụrụ, na cellulose nwetara nwere ịdị ọcha dị elu. site na odo odo
Enwere ike ịhụ site na mpụta mmịpụta dị iche iche na ọdịnaya ọdịnaya nke lignin na-ebelata mgbe niile mgbe usoro ọgwụgwọ ọ bụla gasịrị, nnabata UV nke cellulose enwetara na-ebelata.
Ọkpụkpụ a na-enweta spectral dị nso na ultraviolet absorption spectral curve nke oghere potassium permanganate, na-egosi na cellulose enwetara dị ọcha. nke X
Ntụle dị iche iche nke X-ray gosiri na kristal ikwu nke cellulose ngwaahịa enwetara na-akawanye mma.
2. Nkwadebe nke cellulose ethers
(1) A na-eji otu ihe nnwale ahụ mee ihe iji kwalite usoro nhazi nke alkali decrystallisation pretreatment nke pine cellulose;
A na-eme nyocha orthogonal na nyocha otu ihe na nkwadebe nke CMC, HEC na HECMC sitere na pine osisi alkali cellulose, n'otu n'otu.
njikarịcha. N'okpuru usoro nkwadebe kachasị mma, CMC nwere DS ruo 1.237, HEC nwere MS ruo 1.657 nwetara.
na HECMC nwere DS nke 0.869. (2) Dị ka nyocha FTIR si kwuo, ma e jiri ya tụnyere cellulose osisi pine mbụ, a na-etinye carboxymethyl nke ọma n'ime cellulose ether CMC.
Na cellulose ether HEC, otu hydroxyethyl jikọtara nke ọma; na cellulose ether HECMC, otu hydroxyethyl jikọtara nke ọma
Otu Carboxymethyl na hydroxyethyl.
(3) Enwere ike nweta ya site na nyocha H-NMR na a na-ebute ìgwè hydroxyethyl n'ime ngwaahịa HEC, na HEC na-enweta site na nchịkọta dị mfe.
molar ogo nke nnọchi.
(4) Dị ka nyocha XRD si kwuo, ma e jiri ya tụnyere cellulose osisi pine mbụ, cellulose ethers CMC, HEC na HEECMC nwere.
Ụdị kristal niile gbanwere na ụdị cellulose II, na kristal na-ebelata nke ukwuu.
3. Ngwa nke cellulose ether tapawa
(1) Ihe ndị bụ isi nke mado mbụ: SA, CMC, HEC na HECMC bụ mmiri mmiri pseudoplastic, na
Pseudoplasticity nke cellulose ethers atọ dị mma karịa nke SA, ma e jiri ya tụnyere SA, ọ nwere uru PVI dị ala, nke dị mma maka ibipụta ezigbo ụkpụrụ.
Ifuru; Usoro nke nhazi nhazi nke pastes anọ bụ: SA> CMC> HECMC> HEC; ikike ijide mmiri nke CMC mbụ mado,
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Ndakọrịta nke urea na nnu na-egbochi nsị S yiri SA, na nkwụsi ike nchekwa nke CMC mbụ mado dị mma karịa SA, mana
Ndakọrịta nke HEC raw paste dị njọ karịa nke SA;
Ndakọrịta na nkwụsi ike nchekwa nke sodium bicarbonate dị njọ karịa SA;
SA yiri nke ahụ, mana ikike ijide mmiri, ndakọrịta na sodium bicarbonate na nkwụsi ike nchekwa nke HEECMC raw paste dị ala karịa SA. (2) Mbipụta arụmọrụ nke mado: CMC pụtara agba mkpụrụ na permeability, obibi mmetụta, obibi agba fastness, wdg bụ ihe niile tụnyere SA.
na ọnụ ọgụgụ depaste nke CMC dị mma karịa nke SA; ọnụ ọgụgụ ịda mbà n'obi na mbipụta nke HEC yiri SA, ma ọdịdị nke HEC dị mma karịa nke SA.
Olu agba, permeability na agba ngwa ngwa na-ehichapụ dị ala karịa SA; HECMC ebipụta mmetụta, agba ngwa ngwa na rubbing yiri SA;
Oke tapawa dị elu karịa SA, mana mkpụrụ nke agba pụtara ìhè na nkwụsi ike nchekwa nke HECMC dị ala karịa SA.
5.2 Ndụmọdụ
Site na ntinye ngwa nke 5.1 cellulose ether tapawa nwere ike nweta, cellulose ether tapawa nwere ike iji na-arụ ọrụ.
Tapawa na-ebi akwụkwọ, karịsịa anionic cellulose ethers. N'ihi na iwebata hydrophilic otu carboxymethyl, isii-membered
Mmeghachi omume nke otu hydroxyl bụ isi na mgbanaka, na ụgwọ na-adịghị mma mgbe ionization gasịrị n'otu oge ahụ, nwere ike ịkwalite agba agba nke eriri na agba agba. Agbanyeghị, n'ozuzu,
Mmetụta ngwa nke cellulose ether ebipụta mado adịghị mma, tumadi n'ihi ogo nke nnọchi ma ọ bụ molar nnọchi nke cellulose ether.
N'ihi ogo dị ala nke nnọchi, nkwadebe nke cellulose ethers nwere ogo ngbanwe dị elu ma ọ bụ ogo ngbanwe molar dị elu chọrọ ọmụmụ ihe ọzọ.
Oge nzipu: Ọktoba 08-2022