A na-ekewakwa oke viscosity nke sodium carboxymethyl cellulose n'ọtụtụ ọkwa dịka ojiji dị iche iche si dị. Oke viscosity nke ụdị ịsa ahụ bụ 10-70 (n'okpuru 100), oke viscosity elu sitere na 200-1200 maka ịchọ mma ụlọ na ụlọ ọrụ ndị ọzọ, oke viscosity nke ọkwa nri dịkwa elu karịa. Ha niile karịrị 1000, viscosity nke ụlọ ọrụ dị iche iche abụghị otu.
N'ihi ọtụtụ ojiji ya.
Ọbara nke sodium carboxymethyl cellulose na-emetụta oke molekul ya, ntinye ya, okpomọkụ ya na uru pH ya, a na-agwakọta ya na ethyl ma ọ bụ carboxypropyl cellulose, gelatin, xanthan gum, carrageenan, locust bean gum, guar gum, agar, sodium alginate, pectin, gum arabic na starch, ihe ndị sitere na ya nwekwara ezigbo ndakọrịta (ya bụ, mmetụta synergistic).
Mgbe uru pH bụ 7, viscosity nke sodium carboxymethyl cellulose solution bụ nke kachasị elu, mgbe uru pH bụ 4~11, ọ na-adịgide adịgide. Carboxymethylcellulose n'ụdị alkali metal na ammonium salts na-agbaze na mmiri. Divalent metal ions Ca2+, Mg2+, Fe2+ nwere ike imetụta viscosity ya. Ígwè dị arọ dịka ọlaọcha, barium, chromium ma ọ bụ Fe3+ nwere ike ime ka ọ gbapụta na ngwọta. Ọ bụrụ na a na-achịkwa njupụta nke ions, dị ka mgbakwunye nke ihe na-eme ka chelating mee ihe citric acid, enwere ike ịmepụta ngwọta viscous karịa, nke na-eme ka chịngọm dị nro ma ọ bụ siri ike.
Sodium carboxymethyl cellulose bụ ụdị cellulose eke, nke a na-ejikarị owu linte ma ọ bụ mkpụrụ osisi mee dị ka ihe eji emepụta ihe ma na-enweta mmeghachi omume etherification na monochloroacetic acid n'okpuru ọnọdụ alkaline.
Dịka nkọwapụta nke ihe ndị e ji arụ ọrụ na nnọchi nke hydrogen hydroxyl na selulose D-glucose site na otu carboxymethyl si dị, a na-enweta ngwakọta polymer mmiri na-agbaze na ọkwa dị iche iche nke nnọchi na nkesa dị iche iche nke molekul.
Ebe ọ bụ na sodium carboxymethyl cellulose nwere ọtụtụ njirimara pụrụ iche na nke magburu onwe ya, a na-ejikarị ya eme ihe n'ụlọ ọrụ kemịkalụ kwa ụbọchị, nri na ọgwụ na mmepụta ụlọ ọrụ ndị ọzọ.
Otu n'ime ihe ndị kacha mkpa na-egosi na sodium carboxymethyl cellulose bụ viscosity nke sodium carboxymethyl cellulose. Uru nke viscosity metụtara ihe dị iche iche dịka ntinye, okpomọkụ na ọnụego shear. Agbanyeghị, ihe ndị dị ka ntinye, okpomọkụ na ọnụego shear bụ ihe ndị dị n'èzí na-emetụta viscosity nke sodium carboxymethyl cellulose.
Ibu ya na nkesa molekul bụ ihe ndị dị n'ime ya na-emetụta viscosity nke ngwọta sodium carboxymethyl cellulose. Maka njikwa mmepụta na mmepe arụmọrụ ngwaahịa nke sodium carboxymethyl cellulose, inyocha ibu ya na nkesa ibu molekul nwere uru ntụaka dị oke mkpa, ebe viscosity Ntụle ahụ nwere ike ịrụ naanị ọrụ ntụaka ụfọdụ.
Iwu Newton n'ihe gbasara rheology, biko gụọ ihe dị mkpa gbasara "rheology" na kemistri anụ ahụ, ọ na-esiri ike ịkọwa ya n'otu ahịrịokwu ma ọ bụ abụọ. Ọ bụrụ na ị ga-ekwu ya: maka ngwọta cmc dị nro nke dị nso na mmiri Newtonian, nrụgide shear na-adaba na ọnụego njedebe, a na-akpọkwa njikọ proportional dị n'etiti ha viscosity coefficient ma ọ bụ kinematic viscosity.
A na-enweta viscosity site na ike dị n'etiti agbụ molekul cellulose, gụnyere ike mgbasa na njikọ hydrogen. Karịsịa, polymerization nke ihe ndị sitere na cellulose abụghị nhazi ahịrị kama ọ bụ nhazi nwere ọtụtụ alaka. Na ngwọta ahụ, ọtụtụ cellulose nwere ọtụtụ alaka na-ejikọ ọnụ iji mepụta nhazi netwọk oghere. Ka nhazi ahụ siri ike, otú ahụ ka ike dị n'etiti agbụ molekul dị na ngwọta ahụ sikwuo ike.
Iji mepụta mmiri mmiri n'ime mmiri mmiri nke ihe ndị sitere na cellulose, a ga-emeri ike dị n'etiti agbụ molekul, yabụ ngwọta nwere nnukwu polymerization chọrọ ike ka ukwuu iji mepụta mmiri mmiri. Maka nha viscosity, ike dị na ngwọta CMC bụ ike ndọda. N'ọnọdụ ike ndọda na-adịgide adịgide, nhazi agbụ nke ngwọta CMC nwere nnukwu polymerization nwere ike dị ukwuu, mmiri ...
Ọdịiche dị n'etiti sodium carboxymethyl cellulose na-adaberekarị na ibu molekul, ọ nweghịkwa ihe jikọrọ ya na oke mgbanwe. Ka oke mgbanwe na-abawanye, otú ahụ ka ibu molekul na-abawanye, n'ihi na ibu molekul nke otu carboxymethyl e tinyere na ya buru ibu karịa otu hydroxyl gara aga.
Nnu sodium nke cellulose carboxymethyl ether, nke bụ anionic cellulose ether, bụ ntụ ntụ ma ọ bụ granule ọcha ma ọ bụ mmiri ara ehi, nke nwere njupụta nke 0.5-0.7 g/cm3, ọ fọrọ nke nta ka ọ ghara isi ísì, ọ naghị atọ ụtọ, ọ dịkwa hygroscopic. Ọ dị mfe ịgbasa n'ime mmiri iji mepụta ngwọta colloidal doro anya, ọ naghịkwa agbaze na ihe mgbaze organic dị ka ethanol. pH nke ngwọta mmiri 1% bụ 6.5 ruo 8.5. Mgbe pH>10 ma ọ bụ <5, viscosity nke sodium carboxymethylcellulose na-ebelata nke ukwuu, arụmọrụ ya kacha mma mgbe pH=7.
Ọ kwụsiri ike n'ọkụ. Ọ na-arị elu ngwa ngwa n'okpuru 20℃, ọ na-agbanwekwa nwayọ nwayọ na 45℃. Okpomọkụ ogologo oge karịa 80℃ nwere ike imebi colloid ma belata viscosity na arụmọrụ nke ukwuu. Ọ na-agbaze ngwa ngwa na mmiri, ngwọta ahụ na-apụta ìhè; ọ na-adịgide nke ukwuu na ngwọta alkaline, ọ dịkwa mfe ịgbaze ma ọ bụrụ na acid dị. Mgbe uru pH bụ 2-3, ọ ga-apụta ìhè.
Oge ozi: Nọvemba-07-2022