Ƙungiyoyin hydroxyl akancellulose etherkwayoyin halitta da kwayoyin oxygen a kan ether bond za su samar da hydrogen bond tare da kwayoyin ruwa, juya ruwa kyauta zuwa ruwa mai ɗaure, don haka yana taka rawa mai kyau a cikin ruwa; da yaduwar juna tsakanin kwayoyin ruwa da cellulose ether kwayoyin sarƙoƙi damar ruwa kwayoyin shiga cikin ciki na cellulose ether macromolecular sarkar da kuma zama a karkashin karfi contraitant, game da samar da free ruwa da kuma entangled ruwa, wanda inganta ruwa riƙe da ciminti slurry; cellulose ether inganta rheological Properties, porous cibiyar sadarwa tsarin da osmotic matsa lamba na sabo ne ciminti slurry ko fim-forming Properties na cellulose ether hana yaduwar ruwa.
Riƙewar ruwa na ether cellulose kanta ya fito ne daga solubility da dehydration na cellulose ether kanta. Ƙarfin hydration na ƙungiyoyin hydroxyl kadai bai isa ya biya kuɗin haɗin gwiwar hydrogen mai karfi da kuma dakarun van der Waals tsakanin kwayoyin halitta ba, don haka kawai yana kumbura amma ba ya narke cikin ruwa. Lokacin da aka shigar da masu maye a cikin sarkar kwayoyin halitta, ba kawai abubuwan da ke maye gurbin suna lalata sarƙoƙi na hydrogen ba, har ma da haɗin gwiwar hydrogen ɗin suna lalata saboda ƙulla abubuwan maye tsakanin sarƙoƙi da ke kusa. Girman abubuwan maye, mafi girman nisa tsakanin kwayoyin halitta, kuma mafi girman tasirin lalata haɗin gwiwar hydrogen. Bayan da cellulose lattice ya kumbura, bayani ya shiga, kuma ether cellulose ya zama ruwa mai narkewa, yana samar da babban bayani mai danko, wanda zai taka rawa wajen riƙe ruwa.
Abubuwan da ke shafar aikin riƙe ruwa:
Danko: Mafi girman danko na ether cellulose, mafi kyawun aikin riƙewar ruwa, amma mafi girman danko, mafi girman nauyin kwayoyin halitta na cellulose ether, kuma solubility yana raguwa daidai da haka, wanda yana da mummunar tasiri akan ƙaddamarwa da aikin ginin. na turmi. Gabaɗaya magana, don samfurin iri ɗaya, sakamakon danko da aka auna ta hanyoyi daban-daban ya bambanta sosai, don haka lokacin kwatanta danko, dole ne a aiwatar da shi tsakanin hanyoyin gwaji iri ɗaya (ciki har da zafin jiki, rotor, da sauransu).
Adadin ƙari: Mafi girman adadin ether cellulose da aka ƙara zuwa turmi, mafi kyawun aikin riƙewar ruwa. Yawancin lokaci, ƙaramin adadin ether na cellulose zai iya inganta haɓakar ruwa na turmi sosai. Lokacin da adadin ya kai wani matakin, yanayin ƙara yawan riƙe ruwa yana raguwa.
Barbashi fineness: Mafi kyawun barbashi, mafi kyawun riƙewar ruwa. Lokacin da manyan barbashi na cellulose ether suka hadu da ruwa, nan da nan saman ya narke kuma ya samar da gel don kunsa kayan don hana kwayoyin ruwa daga ci gaba da shiga. Wani lokaci, ko da dogon lokacin da stirring ba zai iya cimma uniform watsawa da rushewa, forming wani turbid flocculent bayani ko agglomeration, wanda ƙwarai rinjayar da ruwa riƙe da cellulose ether. Solubility yana daya daga cikin abubuwan da za a zabi ether cellulose. Fineness kuma muhimmin alamar aiki ne na methyl cellulose ether. Fineness yana rinjayar solubility na methyl cellulose ether. Coarser MC yawanci granular ne kuma ana iya narkar da shi cikin sauƙi a cikin ruwa ba tare da ƙaranci ba, amma adadin narkarwar yana jinkiri sosai kuma bai dace da amfani da busasshiyar turmi ba.
Zazzabi: Yayin da yanayin zafin jiki ya tashi, riƙewar ruwa na ethers cellulose yawanci yakan ragu, amma wasu ethers cellulose da aka gyara kuma suna da kyakkyawan tanadin ruwa a ƙarƙashin yanayin zafi mai zafi; lokacin da zafin jiki ya tashi, hydration na polymers ya raunana, kuma ana fitar da ruwa tsakanin sarƙoƙi. Lokacin da rashin ruwa ya isa, kwayoyin sun fara haɗuwa don samar da gel ɗin tsarin cibiyar sadarwa mai girma uku.
Tsarin kwayoyin halitta: Cellulose ethers tare da ƙananan canji suna da mafi kyawun riƙe ruwa.
Thickening da thixotropy
Kauri:
Tasiri kan iyawar haɗin gwiwa da aikin anti-sagging: Cellulose ethers suna ba da turmi mai laushi mai kyau danko, wanda zai iya haɓaka ikon haɗin gwiwar rigar turmi tare da tushe mai tushe kuma yana haɓaka aikin rigakafin sagging na turmi. Ana amfani dashi ko'ina a cikin plastering turmi, tile bonding turmi da waje rufi tsarin 3.
Effect on material homogeneity: The thickening sakamako na cellulose ethers kuma iya ƙara anti-watsawa ikon da kuma homogeneity na freshly gauraye kayan, hana abu stratification, segregation da ruwa seepage, kuma za a iya amfani da fiber kankare, karkashin ruwa kankare da kai compacting kankare. .
Tushen da tasiri na sakamako mai kauri: Tasirin kauri na ether cellulose akan kayan tushen siminti ya fito ne daga danko na ether ether cellulose. A karkashin irin wannan yanayi, mafi girman danko na ether cellulose, mafi kyawun danko na kayan da aka gyara na siminti, amma idan danko ya yi yawa, zai shafi ruwa da aiki na kayan (kamar manne wa wukar plastering. ). Turmi mai daidaita kai da kankare kanka tare da buƙatun ruwa mai yawa suna buƙatar ƙarancin danko na ether cellulose. Bugu da ƙari, tasirin daɗaɗɗen ether na cellulose zai kuma ƙara yawan buƙatar ruwa na kayan da aka gina da siminti da kuma ƙara yawan fitar da turmi.
Thixotropy:
High-danko cellulose ether ruwa bayani yana da babban thixotropy, wanda kuma shi ne babban hali na cellulose ether. Maganin ruwa mai ruwa na methyl cellulose yawanci yana da pseudoplasticity da ruwa mara-thixotropic a ƙasa da zafin gel ɗin sa, amma yana nuna kaddarorin kwararar Newtonian a ƙananan ƙimar ƙarfi. Pseudoplasticity yana ƙaruwa tare da haɓakar cellulose ether nauyi ko maida hankali, kuma ba shi da alaƙa da nau'in maye da matakin maye gurbin. Saboda haka, cellulose ethers na wannan danko sa, ko MC, HPMC, ko HEMC, ko da yaushe nuna guda rheological Properties muddin maida hankali da kuma zafin jiki zauna akai. Lokacin da yawan zafin jiki ya tashi, an kafa gel na tsari, kuma babban hawan 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 fa'ida sosai don daidaita daidaitawa da sagging na turmi gini yayin gini.
Shigar da iska
Ƙa'ida da tasiri akan aikin aiki: Cellulose ether yana da tasiri mai mahimmanci na iska akan sabbin kayan tushen ciminti. Cellulose ether yana da ƙungiyoyi biyu na hydrophilic (ƙungiyoyin hydroxyl, ƙungiyoyin ether) da ƙungiyoyin hydrophobic (ƙungiyoyin methyl, zoben glucose). Yana da surfactant tare da aikin saman, don haka yana da tasirin haɓakar iska. Tasirin haɓakar iska zai haifar da tasirin ball, wanda zai iya inganta aikin aiki na sabbin kayan da aka gauraye, kamar haɓaka filastik da santsi na turmi yayin aiki, wanda ke da amfani ga yaduwar turmi; zai kuma kara yawan turmi da rage tsadar turmi.
Tasiri akan kaddarorin injina: Tasirin haɓakar iska zai haɓaka porosity na kayan da aka taurare kuma ya rage kaddarorin injinsa kamar ƙarfi da modules na roba.
Tasiri kan ruwa: A matsayinsa na surfactant, cellulose ether shima yana da tasirin jika ko mai a jikin siminti, wanda tare da isar da iskar sa yana kara yawan ruwan siminti, amma tasirinsa mai kauri zai rage yawan ruwa. Tasirin ether cellulose a kan ruwa na kayan da aka yi da siminti shine haɗuwa da filastik da tasiri. Gabaɗaya magana, lokacin da adadin ether cellulose ya ragu sosai, galibi yana bayyana azaman filastik ko tasirin rage ruwa; lokacin da adadin ya yi yawa, tasirin ƙwayar ether na cellulose yana ƙaruwa da sauri, kuma tasirin sa na iska yana jin daɗin cikawa, don haka yana bayyana kamar ƙara ko ƙara buƙatar ruwa.
Lokacin aikawa: Dec-23-2024