Cellulose ether wani nau'in polymer ne da aka yi daga cellulose na halitta ta hanyar gyaran sinadarai. Cellulose ether wani nau'in cellulose ne da aka samo daga cellulose na halitta. Samar da cellulose ether ya bambanta da polymers na roba. Mafi mahimmancin kayansa shine cellulose, wani mahaɗin polymer na halitta. Saboda takamaiman tsarin cellulose na halitta, cellulose kanta ba ta da ikon yin aiki tare da wakilan etherification. Duk da haka, bayan maganin maganin kumburi, haɗin hydrogen mai ƙarfi tsakanin sarƙoƙin kwayoyin halitta da sarƙoƙi suna lalacewa, kuma sakin ƙungiyar hydroxyl mai aiki ya zama cellulose mai amsawa. Sami cellulose ether.
A cikin turmi mai gauraya, adadin ƙarin cellulose ether yana da ƙasa sosai, amma yana iya inganta aikin turmi mai jika sosai, kuma babban ƙari ne wanda ke shafar aikin ginin turmi. Zaɓin da ya dace na ethers cellulose iri-iri, viscosities daban-daban, girman barbashi daban-daban, matakan danko daban-daban da ƙarin adadin zai yi tasiri mai kyau akan inganta aikin turmi busasshe. A halin yanzu, turmi da yawa na dutse da filastik ba su da aikin riƙe ruwa mai kyau, kuma slurry ɗin ruwa zai rabu bayan 'yan mintuna kaɗan na tsayawa.
Rike ruwa muhimmin aiki ne na methyl cellulose ether, kuma aiki ne da masana'antun turmi na busasshe na cikin gida, musamman waɗanda ke yankunan kudu masu yanayin zafi mai yawa, ke mai da hankali a kai. Abubuwan da ke shafar tasirin riƙe ruwa na turmi na busasshen cakuda sun haɗa da adadin MC da aka ƙara, ɗanɗanon MC, ɗanɗanon barbashi da zafin yanayin amfani.
Halayen ethers na cellulose sun dogara ne akan nau'in, adadi da rarrabawar abubuwan maye. Rarraba ethers na cellulose kuma ya dogara ne akan nau'in abubuwan maye, matakin etherification, narkewa da halayen aikace-aikacen da suka shafi hakan. Dangane da nau'in abubuwan maye akan sarkar kwayoyin halitta, ana iya raba shi zuwa monoether da gauraye ether. MC da muke amfani da shi yawanci shine monoether, kuma HPMC shine gaurayen ether. Methyl cellulose ether MC shine samfurin bayan an maye gurbin rukunin hydroxyl akan sashin glucose na cellulose na halitta da methoxy. Tsarin tsarin shine [COH7O2(OH)3-h(OCH3)h ]x. Wani ɓangare na rukunin hydroxyl da ke kan naúrar ana maye gurbinsa da rukunin methoxy, sannan ɗayan ɓangaren kuma ana maye gurbinsa da rukunin hydroxypropyl, tsarin tsarin shine [C6H7O2(OH)3-mn(OCH3)m[OCH2CH(OH)CH3] n]x Ethyl methyl cellulose ether HEMC, waɗannan su ne manyan nau'ikan da ake amfani da su sosai kuma ake sayarwa a kasuwa.
Dangane da narkewar sinadaran, ana iya raba shi zuwa ionic da non-ionic. Ethers cellulose marasa ionic masu narkewa cikin ruwa galibi sun ƙunshi jerin alkyl ethers guda biyu da hydroxyalkyl ethers. Ana amfani da Ionic CMC galibi a cikin sabulun sabulu na roba, buga yadi da rini, binciken abinci da mai. Ana amfani da Non-ionic MC, HPMC, HEMC, da sauransu galibi a cikin kayan gini, shafa latex, magani, sinadarai na yau da kullun, da sauransu. Ana amfani da su azaman mai kauri, wakilin riƙe ruwa, mai daidaita, mai wargazawa da wakilin samar da fim.
Rikewar cellulose ether a cikin ruwa: A cikin samar da kayan gini, musamman busasshen turmi, cellulose ether yana taka muhimmiyar rawa, musamman wajen samar da turmi na musamman (turmi da aka gyara), abu ne mai mahimmanci kuma mai mahimmanci. Muhimmin rawar da cellulose ether mai narkewa cikin ruwa ke takawa a cikin turmi galibi yana da fannoni uku:
1. Kyakkyawan ƙarfin riƙe ruwa
2. Tasiri akan daidaiton turmi da thixotropy
3. Hulɗa da siminti.
Tasirin riƙe ruwa na cellulose ether ya dogara ne akan shan ruwa na layin tushe, abun da ke cikin turmi, kauri na layin turmi, buƙatar ruwa na turmi, da lokacin saita kayan saitawa. Rike ruwa na cellulose ether da kansa ya fito ne daga narkewa da bushewar cellulose ether da kanta. Kamar yadda muka sani, kodayake sarkar kwayoyin cellulose tana ɗauke da adadi mai yawa na ƙungiyoyin OH masu sauƙin sha, ba ya narkewa a cikin ruwa, saboda tsarin cellulose yana da babban matakin crystallinity. Ikon sha ruwa na ƙungiyoyin hydroxyl kaɗai bai isa ya rufe ƙarfin haɗin hydrogen da ƙarfin van der Waals tsakanin ƙwayoyin ba. Saboda haka, yana kumbura kawai amma baya narkewa a cikin ruwa. Lokacin da aka shigar da maye a cikin sarkar kwayoyin, ba wai kawai maye yana lalata sarkar hydrogen ba, har ma haɗin hydrogen na interchain yana lalacewa saboda ɗaure maye tsakanin sarkar da ke maƙwabtaka. Mafi girman maye, mafi girman nisa tsakanin ƙwayoyin. Mafi girman nisa. Yayin da tasirin lalata haɗin hydrogen ya fi girma, cellulose ether yana narkewa cikin ruwa bayan layin cellulose ya faɗaɗa kuma maganin ya shiga, yana samar da maganin ɗanɗano mai yawa. Lokacin da zafin jiki ya tashi, ruwan polymer ɗin zai yi rauni, kuma ruwan da ke tsakanin sarƙoƙi zai fita. Lokacin da tasirin bushewa ya isa, ƙwayoyin suna fara taruwa, suna samar da gel mai girman uku kuma suna naɗewa.
Lokacin Saƙo: Disamba-06-2022