Cellulose ether bụ polymer sịntetik nke sitere na cellulose eke sitere na mgbanwe kemịkalụ. Cellulose ether bụ ihe sitere na cellulose eke. Ihe mmepụta nke cellulose ether dị iche na polymers sịntetik. Ihe kachasị mkpa ya bụ cellulose, ngwakọta polymer eke. N'ihi ihe dị iche iche nke usoro cellulose eke, cellulose n'onwe ya enweghị ike imeghachi omume na ndị ọrụ etherification. Otú ọ dị, mgbe ọgwụgwọ nke onye na-amụba ihe, a na-ebibi njikọ siri ike hydrogen n'etiti ụdọ molecular na agbụ, na ntọhapụ na-arụ ọrụ nke hydroxyl otu na-aghọ cellulose alkali na-emeghachi omume. Nweta cellulose ether.
Na njikere mix ngwa agha, ihe mgbakwunye ego nke cellulose ether dị nnọọ ala, ma ọ nwere ike budata imeziwanye arụmọrụ nke mmiri mmiri ngwa agha, na ọ bụ isi ihe mgbakwunye na-emetụta arụ ọrụ nke ngwa agha. Nhọrọ ezi uche dị na ya nke cellulose ethers nke ụdị dị iche iche, viscosities dị iche iche, nha nha dị iche iche, ọkwa dị iche iche nke viscosity na ego agbakwunyere ga-enwe mmetụta dị mma na nkwalite arụmọrụ nke ngwa ngwa ntụ ntụ. Ka ọ dị ugbu a, ọtụtụ ngwa agha masonry na plasta adịghị arụ ọrụ njide mmiri na-adịghị mma, na slurry mmiri ga-ekewa mgbe nkeji ole na ole guzoro.
Njide mmiri bụ ọrụ dị mkpa nke methyl cellulose ether, ọ bụkwa arụmọrụ nke ọtụtụ ndị na-emepụta ihe ọkụkụ na-ekpo ọkụ na-ekpo ọkụ, karịsịa ndị nọ na mpaghara ndịda nke nwere okpomọkụ dị elu, na-aṅa ntị. Ihe ndị na-emetụta mmetụta njigide mmiri nke ngwakọta ngwakọta akọrọ gụnyere ọnụọgụ MC agbakwunyere, viscosity nke MC, ịdị mma nke ihe na okpomọkụ nke gburugburu ebe obibi.
Njirimara nke cellulose ethers na-adabere n'ụdị, ọnụ ọgụgụ na nkesa nke ndị nọchiri anya ya. Nkewa nke cellulose ethers na-adaberekwa n'ụdị ihe ngbanwe, ogo nke etherification, solubility na ngwa ngwa metụtara ya. Dị ka ụdị ihe ndị na-anọchi anya na eriri molecular, enwere ike kewaa ya na monoether na ngwakọta ether. MC anyị na-ejikarị bụ monoether, na HPMC bụ ngwakọta ether. Methyl cellulose ether MC bụ ngwaahịa mgbe hydroxyl otu na glucose unit nke eke cellulose dochie methoxy. Usoro nhazi bụ [COH7O2(OH) 3-h(OCH3) h ] x. Otu akụkụ nke otu hydroxyl dị na unit ahụ bụ methoxy Group nọchiri anya akụkụ nke ọzọ site na hydroxypropyl otu, usoro nhazi bụ [C6H7O2 (OH) 3-mn (OCH3) m[OCH2CH(OH)CH3] n] x Ethyl methyl cellulose ether HEMC, ndị a bụ ụdị ndị a na-ejikarị na-ere n'ahịa.
N'ihe gbasara solubility, enwere ike kewaa ya na ionic na ndị na-abụghị ionic. Mmiri-soluble na-abụghị ionic cellulose ethers bụ tumadi mejupụtara abụọ usoro nke alkyl ethers na hydroxyalkyl ethers. A na-ejikarị Ionic CMC eme ihe n'ihe ndị sịntetịt, mbipụta textile na akwa akwa, nchọpụta nri na mmanụ. Ndị na-abụghị ionic MC, HPMC, HEMC, wdg bụ ndị a na-ejikarị na ihe owuwu ụlọ, mkpuchi latex, ọgwụ, kemịkalụ kwa ụbọchị, wdg A na-eji dị ka thickener, mmiri na-ejide mmiri, stabilizer, dispersant na film forming agent.
Njide mmiri nke cellulose ether: Na mmepụta nke ihe owuwu ụlọ, karịsịa akọrọ ntụ ntụ ntụ ntụ, cellulose ether na-arụ ọrụ na-enweghị ike dochie ya, karịsịa na mmepụta nke ngwa agha pụrụ iche (ngwa agha gbanwere), ọ bụ ihe dị mkpa na ihe dị mkpa . Ọrụ dị mkpa nke cellulose ether soluble mmiri na ngwa ngwa nwere akụkụ atọ:
1. Ike njigide mmiri dị mma
2. Mmetụta na ngwa agha agbanwe agbanwe na thixotropy
3. Mmekọrịta na ciment.
Mmetụta njide mmiri nke cellulose ether na-adabere na mmịnye mmiri nke oyi akwa isi, ihe mejupụtara nke ngwa agha ahụ, ọkpụrụkpụ nke akwa akwa akwa akwa akwa akwa akwa akwa akwa akwa akwa, mmiri chọrọ ngwa ngwa, na oge nhazi nke ihe nhazi. Njide mmiri nke cellulose ether n'onwe ya sitere na solubility na akpịrị ịkpọ nkụ nke cellulose ether n'onwe ya. Dị ka anyị niile maara, ọ bụ ezie na cellulose molecular chain nwere ọnụ ọgụgụ buru ibu nke ukwuu hydratable OH otu, ọ bụghị soluble na mmiri, n'ihi na cellulose Ọdịdị nwere nnukwu ogo nke crystallinity. Ike hydration nke otu hydroxyl naanị ezughị iji kpuchie njikọ njikọ hydrogen siri ike na ndị agha van der Waals n'etiti ụmụ irighiri ihe. Ya mere, ọ na-aza naanị ma ọ naghị agbaze na mmiri. Mgbe a na-ewebata ihe ngbanwe n'ime agbụ molekụla, ọ bụghị naanị ihe mgbakwunye na-emebi yinye hydrogen, kamakwa a na-emebi njikọ interchain hydrogen n'ihi ịgbanye ihe nọchiri anya n'etiti ụdọ ndị dị n'akụkụ. Ka nnukwu ihe nọchiri anya ya, ka ebe dị anya n'etiti ụmụ irighiri ihe. Nke ka ukwuu na anya. Mmetụta dị ukwuu nke ibibi njikọ hydrogen, cellulose ether na-aghọ mmiri na-agbaze mgbe cellulose lattice gbasaa na ngwọta na-abanye, na-eme ka ngwọta dị elu nke viscosity. Mgbe okpomọkụ na-ebili, hydration nke polymer na-ada mbà, a na-achụpụkwa mmiri n'etiti agbụ. Mgbe mmetụta akpịrị ịkpọ nkụ zuru ezu, ụmụ irighiri ihe ndị ahụ na-amalite ịgbakọta, na-akpụ ihe nhazi netwọk akụkụ atọ wee tụgharịa.
Oge nzipu: Dec-06-2022