CMC na-abụkarị ogige polymer anionic nke a kwadebere site n'imeghachi cellulose eke na caustic alkali na monochloroacetic acid, nke nwere ibu molekụla nke 6400 (± 1 000). Ihe ndị bụ isi na-emepụta bụ sodium chloride na sodium glycolate. CMC bụ nke mgbanwe cellulose eke. Òtù nri na ọrụ ugbo nke United Nations (FAO) na Òtù Ahụ Ike Ụwa (WHO) na-akpọ ya n'ihu ọha " cellulose gbanwere".
àgwà
Isi ihe na-egosi iji tụọ àgwà CMC bụ ogo nke nnọchi (DS) na ịdị ọcha. N'ozuzu, ihe onwunwe nke CMC dị iche iche mgbe DS dị iche; ogo dị elu nke ngbanwe, ka mma solubility dị mma, na mma nghọta na nkwụsi ike nke ngwọta. Dị ka akụkọ si kwuo, nghọta nke CMC ka mma mgbe ogo nke nnọchi bụ 0.7-1.2, na viscosity nke ngwọta mmiri ya bụ nke kasị ukwuu mgbe pH uru bụ 6-9. Iji hụ na àgwà ya dị mma, na mgbakwunye na nhọrọ nke onye na-ahụ maka etherifying, a ga-atụlekwa ihe ụfọdụ na-emetụta ogo nke nnọchi na ịdị ọcha, dị ka mmekọrịta dose n'etiti alkali na etherifying agent, oge etherification, usoro mmiri mmiri, okpomọkụ. , pH uru, ngwọta ntinye uche na salts.
Nyocha nke uru na ọghọm nke sodium carboxymethyl cellulose
Mmepe nke sodium carboxymethyl cellulose bụ n'ezie na-enwetụbeghị ụdị ya. Karịsịa n'ime afọ ndị na-adịbeghị anya, mgbasawanye nke mpaghara ngwa na mbelata ụgwọ ọrụ mmepụta ihe emeela ka mmepụta nke carboxymethyl cellulose na-ewu ewu karị. Ngwaahịa ndị a na-ere ere na-agwakọta.
Mgbe ahụ, otu esi achọpụta àgwà sodium carboxymethyl cellulose, anyị na-enyocha site na ụfọdụ echiche anụ ahụ na nke kemịkal:
Nke mbụ, enwere ike ịmata ya na okpomọkụ carbonization ya. Igwe ikuku carbonization izugbe nke sodium carboxymethyl cellulose bụ 280-300 Celsius C. Mgbe a na-eme ka carbonized tupu okpomọkụ a erute, mgbe ahụ ngwaahịa a nwere nsogbu. (Na-emekarị carbonization na-eji ọkụ muffle)
Nke abuo, a na-amata ya site na okpomọkụ nke ngbanwe ya. N'ozuzu, sodium carboxymethyl cellulose ga-agbanwe agba mgbe ọ ruru ụfọdụ okpomọkụ. Ọnọdụ okpomọkụ bụ 190-200 Celsius C.
Nke atọ, enwere ike ịmata ya site na ọdịdị ya. Ọdịdị nke ọtụtụ ngwaahịa bụ ọcha ntụ ntụ, na urughuru size bụ n'ozuzu 100 ntupu, na ihe gbasara nke puru nke ịgafe bụ 98.5%.
Sodium carboxymethyl cellulose bụ ngwaahịa cellulose a na-ejikarị eme ihe ma nwee ọtụtụ ngwa ngwa, ya mere enwere ike inwe ụfọdụ nṅomi na ahịa. Yabụ otu esi amata ma ọ bụ ngwaahịa nke ndị ọrụ chọrọ nwere ike ịgafe ule njirimara a.
Họrọ 0.5g nke sodium carboxymethyl cellulose, nke na-ejighị n'aka ma ọ bụ ngwaahịa nke sodium carboxymethylcellulose, igbari ya na 50mL mmiri na nwuo, tinye obere ego oge ọ bụla, kpalie na 60 ~ 70 ℃, na okpomọkụ maka 20 nkeji mee otu ngwọta edozi, dị jụụ Mgbe nchọpụta mmiri ahụ gasịrị, a na-eme ule ndị a.
1. Tinye mmiri na ngwọta ule iji gbasaa ugboro 5, tinye 0.5mL nke ngwọta chromotropic acid na 1 dobe ya, ma kpoo ya na mmiri ịsa mmiri maka nkeji 10 ka ọ pụta ìhè-acha odo odo.
2. Tinye 10 ml nke acetone na 5 mL nke ngwọta ule, maa jijiji na mix nke ọma iji mepụta mkpọda na-acha ọcha.
3. Tinye 1mL nke ketone sulfate test solution na 5mL nke ngwọta ule, gwakọta ma maa jijiji iji mepụta ìhè na-acha anụnụ anụnụ flocculent precipitate.
4. Ihe fọdụrụ na-enweta site na ash nke ngwaahịa a na-egosi mmeghachi omume nkịtị nke nnu sodium, ya bụ, sodium carboxymethyl cellulose.
Site na usoro ndị a, ị nwere ike ịchọpụta ma ngwaahịa a zụrụ azụ bụ sodium carboxymethyl cellulose na ịdị ọcha ya, nke na-enye usoro dị mfe ma dị irè maka ndị ọrụ ịhọrọ ngwaahịa n'ụzọ ziri ezi.
Oge nzipu: Nov-12-2022