Cellulose ether polymer roba ce da aka yi da cellulose na halitta azaman albarkatun ƙasa ta hanyar gyare-gyaren sinadarai.Cellulose ether ne wanda aka samu daga halitta cellulose, cellulose ether samar da roba polymer ne daban-daban, da mafi asali abu ne cellulose, halitta polymer mahadi.Saboda ƙayyadaddun tsarin tsarin cellulose na halitta, cellulose kanta ba ta da ikon amsawa tare da wakili na etherifying.Amma bayan lura da kumburi wakili, da karfi hydrogen bond tsakanin kwayoyin sarƙoƙi da kuma sarƙoƙi da aka lalace, da kuma aiki na hydroxyl kungiyar da aka saki a cikin alkali cellulose da dauki ikon, da cellulose ether aka samu ta hanyar dauki etherifying wakili - OH kungiyar zuwa cikin. - KO kungiya.
Abubuwan da ke cikin ethers cellulose sun dogara da nau'in, lamba da rarraba abubuwan maye.Har ila yau, ƙaddamar da ether cellulose yana dogara ne akan nau'in maye gurbin, digiri na etherification, solubility da aikace-aikacen da ke da alaƙa za a iya rarraba.Dangane da nau'in maye gurbin akan sarkar kwayoyin halitta, ana iya raba shi zuwa ether guda ɗaya da gauraye ether.Yawancin lokaci ana amfani da MC azaman ether ɗaya, yayin da HPmc shine ether mai gauraya.Methyl cellulose ether MC ne na halitta cellulose glucose naúrar a kan hydroxyl ne methoxide maye gurbinsu da samfurin tsarin dabara [CO H7O2 (OH) 3-H (OCH3) H] X, hydroxypropyl methyl cellulose ether HPmc ne naúrar a kan hydroxyl ne part. na methoxide ya maye gurbin, wani ɓangare na samfurin hydroxypropyl ya maye gurbin, Tsarin tsarin shine [C6H7O2 (OH) 3-MN (OCH3) M [OCH2CH (OH) CH3] N] X da hydroxyethyl methyl cellulose ether HEmc, wanda aka yi amfani da shi sosai. kuma ana sayarwa a kasuwa.
Daga solubility za a iya raba zuwa nau'in ionic da wadanda ba ionic irin.Ruwa mai narkewa mara-ionic cellulose ether yafi hada da alkyl ether da hydroxyl alkyl ether guda biyu jerin iri.Ana amfani da Ionic Cmc galibi a cikin kayan wanka na roba, yadi, bugu, abinci da kuma amfani da man fetur.Non-ionic MC, HPmc, HEmc da sauran galibi ana amfani da su a cikin kayan gini, suturar latex, magani, sunadarai na yau da kullun da sauran fannoni.A matsayin wakili mai kauri, wakili mai riƙe ruwa, stabilizer, dispersant, wakilin samar da fim.
Cellulose ether ruwa riƙewa
A cikin samar da kayan gini, musamman busassun turmi gauraye, ether cellulose yana taka rawar da ba za a iya maye gurbinsa ba, musamman wajen samar da turmi na musamman (turmi da aka gyara), wani bangare ne na dole.
Muhimmiyar rawar da ether mai narkewa ta ruwa mai narkewa a cikin turmi galibi yana da nau'ikan abubuwa guda uku, ɗayan kyakkyawan ikon riƙe ruwa, na biyu shine tasirin daidaiton turmi da thixotropy, na uku shine hulɗa tare da ciminti.
Tsarin ruwa na Cellulose ether, ya dogara da tushe na hydroscopicity, abun da ke ciki na turmi, turmi Layer kauri, buƙatun ruwa na turmi, lokacin daɗaɗɗen kayan abu.Riƙewar ruwa na ether cellulose ya fito ne daga solubility da dehydration na cellulose ether kanta.Sanannen abu ne cewa sarƙoƙi na cellulose, ko da yake suna ɗauke da adadi mai yawa na ƙungiyoyin OH masu ruwa sosai, ba su narkewa a cikin ruwa saboda tsarin su na crystalline.Ƙarfin hydration na ƙungiyoyin hydroxyl kadai bai isa ya biya kuɗin haɗin gwiwar hydrogen mai ƙarfi da kuma van der Waals ba.Lokacin da aka shigar da abubuwan maye a cikin sarkar kwayoyin, ba kawai masu maye gurbin suna lalata sarkar hydrogen ba, har ma da haɗin gwiwar hydrogen ɗin yana karye saboda ƙulla abubuwan maye tsakanin sarƙoƙi da ke kusa.Mafi girman abubuwan maye gurbin su, mafi girman nisa tsakanin kwayoyin halitta shine.Mafi girma da lalata tasirin haɗin gwiwar hydrogen, haɓakar cellulose lattice, bayani a cikin ether cellulose ya zama mai narkewa mai ruwa, da samuwar babban danko bayani.Yayin da zafin jiki ya tashi, hydration na polymer yana raguwa kuma ana fitar da ruwa tsakanin sarƙoƙi.Lokacin da tasirin dehydrating ya isa, kwayoyin sun fara haɗuwa kuma gel ɗin yana ninka a cikin hanyar sadarwa mai girma uku.Abubuwan da ke shafar riƙewar ruwa na turmi sun haɗa da danko ether cellulose, sashi, fineness barbashi da zafin sabis.
Mafi girman danko na ether cellulose, mafi kyawun aikin riƙewar ruwa, danko na maganin polymer.Nauyin kwayoyin (digiri na polymerization) na polymer kuma an ƙaddara shi ta hanyar tsayi da ilimin halittar jiki na tsarin kwayoyin halitta na sarkar, kuma rarraba adadin masu maye gurbin kai tsaye yana rinjayar kewayon danko.[eta] = km alfa
Danko na ciki na mafita na polymer
M polymer kwayoyin nauyi
α-polymer halayyar akai-akai
K danko bayani coefficient
Dankowar maganin polymer ya dogara da nauyin kwayoyin halitta na polymer.Danko da maida hankali na cellulose ether mafita suna da alaka da aikace-aikace daban-daban.Saboda haka, kowane cellulose ether yana da yawa daban-daban danko bayani dalla-dalla, danko tsari ne kuma yafi ta hanyar lalatar alkali cellulose, wato karaya na cellulose kwayoyin sarkar cimma.
Don girman barbashi, mafi kyawun barbashi, mafi kyawun riƙewar ruwa.Large barbashi na cellulose ether lamba tare da ruwa, da surface nan da nan narke da kuma samar da wani gel to kunsa sama da abu don hana ruwa kwayoyin daga ci gaba da shiga, wani lokacin dogon lokaci stirring ba za a iya ko'ina tarwatsa narkar da, samuwar wani laka flocculent bayani ko agglomerate.Solubility na ether cellulose yana daya daga cikin abubuwan da za a zabi ether cellulose.
Thickening da thixotropy na cellulose ether
Sakamakon na biyu na ether cellulose - thickening ya dogara da: digiri na ether polymerization cellulose, ƙaddamar da bayani, ƙimar ƙarfi, zafin jiki da sauran yanayi.Kayan gelation na maganin ya keɓanta ga alkyl cellulose da abubuwan da aka gyara.Halayen Gelation suna da alaƙa da matakin maye gurbin, ƙaddamar da bayani da ƙari.Don abubuwan da aka gyara na hydroxyl alkyl, kayan gel kuma suna da alaƙa da matakin gyaran hydroxyl alkyl.Domin bayani taro na low danko MC da HPmc za a iya shirya 10% -15% maida hankali bayani, matsakaici danko MC da HPmc za a iya shirya 5% -10% bayani da kuma high danko MC da HPmc za a iya shirya kawai 2% -3% bayani, kuma yawanci danko na cellulose ether kuma an ƙididdige shi da 1% -2% bayani.Babban nauyin ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar cuta, nau'in polymers daban-daban suna da danko daban-daban, danko da nauyin kwayoyin halitta kamar haka, [η] = 2.92 × 10-2 (DPn) 0.905, DPn shine matsakaici. polymerization darajar da high.Ƙarƙashin nauyin ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar cuta don ƙara ƙarin don cimma maƙasudin danko.Dankin sa yana da ƙasa da dogaro akan ƙimar ƙarfi, babban danko don cimma maƙasudin maƙasudi, adadin da ake buƙata don ƙara ƙasa da ƙasa, danko ya dogara da ƙimar girma.Sabili da haka, don cimma wani daidaituwa, dole ne a ba da garantin wani adadin ether cellulose (mahimmancin bayani) da danko bayani.Gelation zafin jiki na maganin ya ragu a layi tare da karuwa da ƙaddamar da maganin, kuma gelation ya faru a cikin dakin da zafin jiki bayan kai wani matsayi.HPmc yana da babban taro na gelation a dakin da zafin jiki.
Hakanan za'a iya daidaita daidaito ta hanyar zaɓar girman barbashi da ethers cellulose tare da digiri daban-daban na gyare-gyare.Abin da ake kira gyare-gyare shine gabatarwar ƙungiyar hydroxyl alkyl a wani mataki na maye gurbin akan tsarin kwarangwal na MC.Ta hanyar canza dabi'un maye gurbin dangi biyu, wato, DS da MS dangi maye dabi'un methoxy da hydroxyl.Ana buƙatar kaddarorin daban-daban na ether cellulose ta hanyar canza dabi'un maye gurbin dangi na nau'ikan maye biyu.
dangantaka tsakanin daidaito da gyare-gyare.A cikin hoto na 5, ƙari na ether cellulose yana rinjayar yawan amfani da ruwa na turmi kuma yana canza yanayin ruwa da siminti, wanda shine tasiri mai zurfi.Mafi girman sashi, yawan amfani da ruwa.
Cellulose ethers da aka yi amfani da su a cikin kayan gini na foda dole ne su narke da sauri a cikin ruwan sanyi kuma su samar da tsarin tare da daidaitattun daidaito.Idan adadin shear da aka bayar har yanzu yana juye-juye da colloidal samfurin mara inganci ko mara kyau.
Har ila yau, akwai kyakkyawar dangantaka tsakanin ciminti slurry daidaito da kuma sashi na cellulose ether, cellulose ether iya ƙwarai ƙara danko na turmi, mafi girma da sashi, da mafi fili sakamako.
Maganin ruwa na Cellulose ether tare da babban danko yana da babban thixotropy, wanda shine ɗayan halayen ether cellulose.Maganganun ruwa na nau'in nau'in polymers na Mc yawanci suna da pseudoplastic, ruwa maras-thixotropic a ƙasa da zafin gel ɗin su, amma kaddarorin kwararar Newtonian a ƙananan ƙimar ƙarfi.Pseudoplasticity yana ƙaruwa tare da haɓakar nauyin kwayoyin halitta ko tattarawar ether cellulose kuma yana da zaman kansa daga nau'in maye gurbin da digiri.Saboda haka, cellulose ethers na wannan danko sa, ko MC, HPmc ko HEmc, ko da yaushe nuna guda rheological Properties idan dai da taro da kuma zazzabi zauna akai.Lokacin da yawan zafin jiki ya karu, gel ɗin tsari yana samuwa kuma babban thixotropic yana faruwa.Cellulose ethers tare da babban taro da ƙananan danko suna nuna thixotropy ko da a ƙasa da zafin jiki na gel.Wannan kadarar tana da matuƙar fa'ida ga ginin turmi don daidaita magudanar ruwa da kayan rataye.Ya kamata a bayyana a nan cewa mafi girma danko na cellulose ether, mafi kyawun riƙewar ruwa, amma mafi girma da danko, mafi girman nauyin kwayoyin halitta na cellulose ether, daidaitattun raguwa na solubility, wanda yana da mummunar tasiri akan. da turmi taro da yi yi.Mafi girman danko, mafi bayyane tasirin tasirin turmi, amma ba cikakkiyar alaƙa ba ce.Wasu ƙananan danko, amma gyare-gyaren ether cellulose a inganta ƙarfin tsarin tsarin jika yana da kyakkyawan aiki, tare da karuwar danko, haɓakar ruwa na cellulose ether ya inganta.
Lokacin aikawa: Maris-30-2022