Rukunin Hydroxil a kancellulose etherKwayoyin halitta da kuma atom ɗin iskar oxygen da ke kan haɗin ether za su samar da haɗin hydrogen tare da ƙwayoyin ruwa, suna mai da ruwa kyauta zuwa ruwa mai ɗaure, don haka suna taka rawa mai kyau wajen riƙe ruwa; yaɗuwar juna tsakanin ƙwayoyin ruwa da sarƙoƙin ƙwayoyin cellulose ether yana ba da damar ƙwayoyin ruwa su shiga cikin sarƙoƙin ƙwayoyin cellulose ether kuma su fuskanci ƙalubale masu ƙarfi, ta haka ne za su samar da ruwa kyauta da ruwan da ya makale, wanda ke inganta riƙe ruwa na siminti; cellulose ether yana inganta halayen rheological, tsarin hanyar sadarwa mai ramuka da matsin lamba na osmotic na siminti sabo ko kaddarorin samar da fim na cellulose ether suna hana yaɗuwar ruwa.
Rikewar ruwa na cellulose ether da kanta ya samo asali ne daga narkewar da kuma bushewar cellulose ether da kanta. Ƙarfin ruwa na ƙungiyoyin hydroxyl kaɗai bai isa ya biya ƙarfin haɗin hydrogen da ƙarfin van der Waals tsakanin ƙwayoyin ba, don haka yana kumbura kawai amma baya narkewa a cikin ruwa. Lokacin da aka shigar da abubuwan maye a cikin sarkar ƙwayoyin, ba wai kawai abubuwan maye suna lalata sarkar hydrogen ba, har ma haɗin hydrogen na interchain suna lalacewa saboda haɗin abubuwan maye tsakanin sarkar da ke maƙwabtaka. Girman abubuwan maye, girman nisa tsakanin ƙwayoyin, da kuma girman tasirin lalata haɗin hydrogen. Bayan layin cellulose ya kumbura, maganin yana shiga, kuma cellulose ether ya zama mai narkewa cikin ruwa, yana samar da mafita mai ƙarfi, wanda daga nan yake taka rawa wajen riƙe ruwa.
Abubuwan da ke shafar aikin riƙe ruwa:
Danko: Girman danko na cellulose ether, mafi kyawun aikin riƙe ruwa, amma mafi girman danko, mafi girman nauyin kwayoyin halitta na cellulose ether, kuma narkewarsa yana raguwa daidai da haka, wanda ke da mummunan tasiri akan yawan aiki da aikin ginin turmi. Gabaɗaya, ga samfurin iri ɗaya, sakamakon danko da aka auna ta hanyoyi daban-daban sun bambanta sosai, don haka lokacin kwatanta danko, dole ne a yi shi tsakanin hanyoyin gwaji iri ɗaya (gami da zafin jiki, rotor, da sauransu).
Adadin ƙari: Da yawan adadin cellulose ether da aka ƙara a cikin turmi, haka nan ingancin riƙe ruwa yake. Yawanci, ƙaramin adadin cellulose ether na iya inganta yawan riƙe ruwa na turmi sosai. Idan adadin ya kai wani matsayi, yanayin ƙaruwar riƙe ruwa yana raguwa.
Tsantsar ƙwayoyin cuta: Da zarar ƙwayoyin cuta sun yi ƙanƙanta, to, riƙewar ruwa zai fi kyau. Lokacin da manyan ƙwayoyin cellulose ether suka haɗu da ruwa, saman zai narke nan take ya samar da gel don naɗe kayan don hana ƙwayoyin ruwa ci gaba da shiga. Wani lokaci, ko da juyawa na dogon lokaci ba zai iya cimma warwatsewa da narkewa iri ɗaya ba, yana samar da mafita mai tururi ko haɗuwa, wanda ke shafar riƙewar ruwa na cellulose ether sosai. Narkewa yana ɗaya daga cikin abubuwan da ke haifar da zaɓar cellulose ether. Tsantsar kuma muhimmin alamar aiki ne na methyl cellulose ether. Tsantsar tana shafar narkewar methyl cellulose ether. Coarser MC yawanci yana da granular kuma ana iya narke shi cikin sauƙi a cikin ruwa ba tare da haɗuwa ba, amma ƙimar narkewar tana da jinkiri sosai kuma bai dace da amfani da shi a cikin busasshen turmi ba.
Zafin Jiki: Yayin da zafin yanayi ke ƙaruwa, riƙewar ruwa na ethers na cellulose yawanci yana raguwa, amma wasu ethers na cellulose da aka gyara suma suna da kyakkyawan riƙe ruwa a ƙarƙashin yanayin zafi mai yawa; lokacin da zafin ya tashi, ruwan polymers ɗin yana raguwa, kuma ruwan da ke tsakanin sarƙoƙi yana fita. Lokacin da bushewar ta isa, ƙwayoyin suna fara taruwa don samar da gel mai girman uku.
Tsarin kwayoyin halitta: Kwayoyin cellulose masu ƙarancin maye gurbin suna da ingantaccen riƙe ruwa.
Kauri da thixotropy
Kauri:
Tasiri kan ƙarfin haɗawa da aikin hana tsagewa: Cellulose ethers suna ba da turmi mai laushi mai kyau, wanda zai iya ƙara ƙarfin haɗa turmi mai laushi tare da matakin tushe da kuma inganta aikin hana tsagewa na turmi. Ana amfani da shi sosai wajen yin turmi mai laushi, turmi mai ɗaure tayal da tsarin rufin bango na waje 3.
Tasiri ga daidaiton abu: Tasirin kauri na cellulose ethers na iya ƙara ƙarfin hana wargajewa da daidaiton kayan da aka haɗa, hana rarraba kayan, rarrabuwa da kuma zubewar ruwa, kuma ana iya amfani da shi a cikin simintin zare, simintin ƙarƙashin ruwa da simintin da ke danne kansa.
Tushe da tasirin kauri: Tasirin kauri na cellulose ether akan kayan da aka gina a siminti ya samo asali ne daga danko na maganin cellulose ether. A ƙarƙashin irin wannan yanayi, girman danko na cellulose ether, mafi kyawun danko na kayan da aka gyara a siminti, amma idan danko ya yi yawa, zai shafi ruwa da aiki na kayan (kamar manne wa wukar da aka yi da siminti). Turmi mai daidaita kansa da siminti mai matse kansa tare da buƙatar ruwa mai yawa yana buƙatar ƙarancin danko na cellulose ether. Bugu da ƙari, tasirin kauri na cellulose ether zai kuma ƙara buƙatar ruwa na kayan da aka gina a siminti da kuma ƙara yawan turmi.
Thixotropy:
Maganin ruwa mai ƙarfi na cellulose ether yana da babban thixotropy, wanda kuma babban siffa ne na cellulose ether. Maganin ruwa na methyl cellulose yawanci yana da pseudoplasticity da rashin thixotropic fluidity a ƙasa da zafin gel ɗinsa, amma yana nuna halayen kwararar Newtonian a ƙananan ƙimar yankewa. Pseudoplasticity yana ƙaruwa tare da ƙaruwar nauyin ƙwayoyin cellulose ether ko taro, kuma ba shi da alaƙa da nau'in maye gurbin da matakin maye gurbin. Saboda haka, cellulose ethers masu matakin danko iri ɗaya, ko MC, HPMC, ko HEMC, koyaushe suna nuna irin wannan halayen rheological matuƙar yawan da zafin ya kasance iri ɗaya. Lokacin da zafin ya tashi, ana samar da gel na tsari, kuma babban kwararar thixotropic yana faruwa. Cellulose ethers masu yawan maida hankali da ƙarancin danko suna nuna thixotropy ko da ƙasa da zafin gel. Wannan kadarar tana da matukar amfani don daidaita matakin da lanƙwasa turmi na gini yayin gini.
Shiga cikin iska
Ka'ida da Tasirin Aiki: Cellulose ether yana da tasiri mai mahimmanci a cikin iska akan kayan da aka yi da siminti sabo. Cellulose ether yana da ƙungiyoyin hydrophilic (ƙungiyoyin hydroxyl, ƙungiyoyin ether) da ƙungiyoyin hydrophobic (ƙungiyoyin methyl, zoben glucose). Yana da aikin surfactant mai aiki a saman, don haka yana da tasirin shigar iska. Tasirin shigar iska zai haifar da tasirin ƙwallo, wanda zai iya inganta aikin kayan da aka haɗa sabo, kamar ƙara ƙarfin turmi da santsi yayin aiki, wanda ke da amfani ga yaduwar turmi; kuma zai ƙara yawan fitar turmi da rage farashin samar da turmi.
Tasiri ga halayen injiniya: Tasirin shigar iska zai ƙara yawan porosity na kayan da aka taurare kuma ya rage halayen injiniyansa kamar ƙarfi da modulus na roba.
Tasirin Ruwa: A matsayinsa na mai surfactant, cellulose ether yana da tasirin jika ko shafawa akan barbashin siminti, wanda tare da tasirin shigar iska yana ƙara yawan ruwan kayan da aka yi da siminti, amma tasirin kauri zai rage yawan ruwan. Tasirin cellulose ether akan yawan ruwan kayan da aka yi da siminti haɗuwa ce ta tasirin plasticization da kauri. Gabaɗaya, idan yawan cellulose ether ya yi ƙasa sosai, galibi yana bayyana azaman tasirin plasticization ko rage ruwa; lokacin da yawan amfani ya yi yawa, tasirin kauri na cellulose ether yana ƙaruwa da sauri, kuma tasirin shigar iska yana ƙaruwa, don haka yana bayyana azaman kauri ko ƙara buƙatar ruwa.
Lokacin Saƙo: Disamba-23-2024