Carboxymethyl cellulose:
Ioniccellulose etherAn yi shi daga filaye na halitta (auduga, da dai sauransu) bayan maganin alkali, ta yin amfani da sodium monochloroacetate a matsayin wakili na etherification, da kuma jurewa jerin jiyya. Matsakaicin maye gaba ɗaya shine 0.4 ~ 1.4, kuma aikin sa yana tasiri sosai ta matakin maye gurbin.
(1) Carboxymethyl cellulose ya fi hygroscopic, kuma zai ƙunshi ƙarin ruwa lokacin da aka adana shi a ƙarƙashin yanayi na yau da kullum.
(2) Maganin ruwa na Carboxymethyl cellulose baya samar da gel, kuma danko yana raguwa tare da karuwar zafin jiki. Lokacin da zafin jiki ya wuce 50 ° C, danko ba zai iya jurewa ba.
(3) Kwanciyar PH yana tasiri sosai. Gabaɗaya, ana iya amfani da shi a cikin turmi na tushen gypsum, amma ba a cikin turmi na tushen siminti ba. Lokacin da alkaline sosai, zai rasa danko.
(4) Riƙewar ruwansa ya yi ƙasa da na methyl cellulose. Yana da tasiri mai tasiri akan turmi na tushen gypsum kuma yana rage ƙarfinsa. Duk da haka, farashin carboxymethyl cellulose yana da ƙasa sosai fiye da na methyl cellulose.
Cellulose alkyl ether:
Wakilan sune methyl cellulose da ethyl cellulose. A cikin samar da masana'antu, methyl chloride ko ethyl chloride ana amfani dashi gabaɗaya azaman wakili na etherification, kuma halayen shine kamar haka:
A cikin dabarar, R yana wakiltar CH3 ko C2H5. Tattalin Arziki ba wai kawai yana rinjayar matakin etherification ba, har ma yana rinjayar amfani da alkyl halides. Ƙarƙashin ƙwayar alkali, mafi ƙarfin hydrolysis na alkyl halide. Don rage yawan amfani da wakili na etherifying, dole ne a ƙara yawan ƙwayar alkali. Koyaya, lokacin da aka rage yawan alkyabbar alkali sosai, an rage tasirin kumburi na selulose, wanda ba zai iya amfani da hakkin eBhoration ba, kuma saboda haka ana rage yawan eheritation. Don wannan dalili, za'a iya ƙara ƙwanƙwasa lemun tsami ko ƙwanƙwasa a yayin da ake amsawa. Reactor yakamata ya kasance yana da na'urar motsa jiki mai kyau da tsagewa ta yadda za'a iya rarraba alkali daidai gwargwado.
Methyl cellulose ne yadu amfani da thickener, m da m colloid da dai sauransu Har ila yau, za a iya amfani da matsayin dispersant ga emulsion polymerization, a bonding dispersant ga tsaba, a yadi slurry, wani ƙari ga abinci da kayan shafawa, a likita m, a magani shafi abu, kuma ga latex Paint, bugu Amfani da tawada, da ikon sarrafa lokacin da aka samar da yumbu, da kuma ƙara lokacin da aka samar da ƙarfi, da kuma samar da yumbura, a lokacin da aka fara samar da yumbu. da dai sauransu.
Samfuran Ethyl cellulose suna da ƙarfin injina, sassauci, juriya mai zafi da juriya mai sanyi. Ƙananan ethyl cellulose mai maye gurbin yana narkewa a cikin ruwa kuma yana tsarma maganin alkaline, kuma samfuran da aka maye gurbinsu suna narkewa a mafi yawan kaushi na kwayoyin halitta. Yana da kyau dacewa tare da daban-daban resins da plasticizers. Ana iya amfani da shi don yin robobi, fina-finai, varnishes, adhesives, latex da kayan shafa don magunguna, da sauransu.
Gabatarwar ƙungiyoyin hydroxyalkyl a cikin cellulose alkyl ethers na iya inganta solubility, rage yawan hankali ga salting fita, ƙara yawan zafin jiki da kuma inganta yanayin zafi mai zafi, da dai sauransu Matsayin canji a cikin abubuwan da ke sama ya bambanta da yanayin masu maye gurbin da rabo na alkyl zuwa ƙungiyoyin hydroxyalkyl.
Cellulose hydroxyalkyl ether:
Wakilan sune hydroxyethyl cellulose da hydroxypropyl cellulose. Etherifying jamiái su ne epoxides kamar ethylene oxide da propylene oxide. Yi amfani da acid ko tushe a matsayin mai kara kuzari. Masana'antu samar da shi ne don amsa alkali cellulose tare da etherification wakili: hydroxyethyl cellulose tare da babban canji darajar ne mai narkewa a cikin ruwan sanyi da ruwan zafi. Hydroxypropyl cellulose tare da babban canji darajar yana narkewa ne kawai a cikin ruwan sanyi amma ba cikin ruwan zafi ba. Hydroxyethyl cellulose za a iya amfani da a matsayin thickener ga latex coatings, yadi bugu da rini pastes, takarda size kayan, adhesives da m colloid. Amfani da hydroxypropyl cellulose yayi kama da na hydroxyethyl cellulose. Hydroxypropyl cellulose tare da ƙananan ƙimar musanyawa za'a iya amfani dashi azaman kayan haɓakar magunguna, wanda zai iya samun duka abubuwan ɗaurewa da tarwatsawa.
Carboxymethylcellulose, an rage shi azamanCMC, gabaɗaya yana wanzuwa a cikin nau'in gishirin sodium. Wakilin etherifying shine monochloroacetic acid, kuma amsawar shine kamar haka:
Carboxymethyl cellulose shine mafi yawan amfani da ether mai narkewa da ruwa. A da, an yafi amfani da shi azaman hakowa laka, amma a yanzu an mika shi a matsayin ƙari na wanka, slurry tufafi, latex Paint, shafi na kwali da takarda, da dai sauransu. Pure carboxymethyl cellulose za a iya amfani da a abinci, magani, kayan shafawa, da kuma a matsayin m ga tukwane da molds.
Polyanionic cellulose (PAC) wani nau'in ionic necellulose etherkuma babban samfuri ne na maye gurbin carboxymethyl cellulose (CMC). Farin fari ne, fari-fari ko ɗan rawaya foda ko granule, mara guba, mara daɗi, mai sauƙin narkewa a cikin ruwa, yana samar da ingantaccen bayani tare da wani ɗanko, yana da mafi kyawun kwanciyar hankali na juriya na zafi da juriya na gishiri, da ƙaƙƙarfan kaddarorin antibacterial. Babu mildew da lalacewa. Yana da halaye na babban tsarki, babban matsayi na maye gurbin, da rarraba iri ɗaya na maye gurbin. Ana iya amfani da shi azaman ɗaure, thickener, rheology modifier, ruwa asarar rage, dakatar da stabilizer, da dai sauransu Polyanionic cellulose (PAC) ne yadu amfani a duk masana'antu inda CMC za a iya amfani da, wanda zai iya ƙwarai rage sashi, sauƙaƙe amfani, samar da mafi kwanciyar hankali da kuma saduwa mafi girma tsari bukatun.
Cyanoethyl cellulose shine samfurin amsawa na cellulose da acrylonitrile a ƙarƙashin catalysis na alkali:
Cyanoethyl cellulose yana da babban dielectric akai-akai da ƙarancin asara kuma ana iya amfani dashi azaman matrix resin don phosphor da fitilu na lantarki. Za a iya amfani da ƙananan musanya cyanoethyl cellulose azaman insulating takarda don masu canji.
An shirya manyan ethers barasa mai kitse, alkenyl ethers, da ethers barasa mai ƙanshi na cellulose, amma ba a yi amfani da su a aikace ba.
Hanyoyin shirye-shiryen ether na cellulose za a iya raba su zuwa hanyar matsakaici na ruwa, hanyar narkewa, hanyar kneading, hanyar slurry, hanyar gas mai ƙarfi, hanyar lokaci na ruwa da haɗuwa da hanyoyin da ke sama.
Lokacin aikawa: Afrilu-28-2024