Cellulose ether zuwa turmi gypsum

Dukansu carboxymethyl cellulose da methyl cellulose za a iya amfani da a matsayin ruwa-retaining jamiái don plaster, amma ruwa-retaining sakamako na carboxymethyl cellulose ne da yawa m fiye da na methyl cellulose, da kuma carboxymethyl cellulose ƙunshi sodium gishiri, don haka shi ne ba dace da plaster. paris. Yana da sakamako na retarding kuma yana rage ƙarfin filastar paris. Methyl cellulose abu ne mai dacewa don kayan siminti na gypsum wanda ke haɗa ruwa, kauri, ƙarfafawa, da viscosifying, sai dai cewa wasu nau'in suna da tasiri mai tasiri lokacin da adadin ya girma. fiye da carboxymethyl cellulose. A saboda wannan dalili, yawancin gypsum composite gelling kayan sun ɗauki hanyar haɗakarwar carboxymethyl cellulose da methyl cellulose, waɗanda ba wai kawai suna aiwatar da halayensu ba (kamar tasirin karboxymethyl cellulose na retarding, tasirin ƙarfafa methyl cellulose), kuma suna ba da fa'idodin gama gari. (kamar ajiyar ruwa da tasirin su). Ta wannan hanyar, duka aikin riƙewar ruwa na kayan simintin gypsum da cikakken aikin simintin simintin gypsum za a iya inganta su, yayin da karuwar farashin ke kiyayewa a mafi ƙasƙanci.

Yaya mahimmancin danko na methyl cellulose ether don turmi gypsum?

Danko shine muhimmin ma'auni namethyl cellulose etheryi.

Gabaɗaya magana, mafi girman danko, mafi kyawun tasirin riƙe ruwa na turmi gypsum. Duk da haka, mafi girma da danko, mafi girman nauyin kwayoyin halitta na methyl cellulose ether, da kuma raguwa mai dacewa a cikin solubility zai yi mummunan tasiri akan ƙarfin da aikin ginin turmi. Mafi girma da danko, mafi bayyananne tasirin thickening akan turmi, amma ba daidai ba ne kai tsaye. Mafi girman danko, da ƙarin danko turmi zai kasance. A lokacin ginawa, an nuna shi a matsayin mai mannewa ga scraper da high adhesion zuwa substrate. Amma ba taimako ba ne don ƙara ƙarfin tsarin jika da kanta. Bugu da ƙari, a lokacin ginawa, aikin anti-sag na turmi rigar ba a bayyane yake ba. Akasin haka, wasu matsakaici da ƙananan danko amma gyare-gyaren ethers na methyl cellulose suna da kyakkyawan aiki wajen inganta ƙarfin tsarin jika.

Yaya mahimmancin fineness na cellulose ether zuwa turmi?

Fineness kuma muhimmin ma'aunin aiki ne na methyl cellulose ether. Ana buƙatar MC da aka yi amfani da shi don busassun busassun turmi don zama foda tare da ƙananan abun ciki na ruwa, kuma fineness kuma yana buƙatar 20% zuwa 60% na girman barbashi ya zama ƙasa da 63m. Rashin lafiya yana rinjayar solubility na methyl cellulose ether. Coarse MC yawanci granular ne, wanda ke da sauƙin tarwatsawa da narke cikin ruwa ba tare da haɓaka ba, amma yawan narkewa yana da jinkirin gaske, don haka bai dace da amfani da busassun busassun turmi ba. Wasu samfuran cikin gida suna flocculent, ba sauƙin tarwatsawa da narkewa cikin ruwa ba, kuma suna da sauƙin haɓakawa. A busasshen turmi foda, MC yana tarwatsewa tsakanin aggregates, filaye masu kyau da siminti da sauran kayan siminti. Kyakkyawan isasshen foda kawai zai iya guje wa methyl cellulose ether agglomeration lokacin haɗuwa da ruwa. Lokacin da aka ƙara MC da ruwa don narkar da agglomerates, yana da wuyar tarwatsawa da narkewa. M MC ba kawai ɓatacce ba ne, amma kuma yana rage ƙarfin gida na turmi. Lokacin da irin wannan busasshen turmi na foda a cikin babban yanki, saurin warkar da turmi na gida zai ragu sosai, kuma za a sami tsagewa saboda lokutan warkewa daban-daban. Don turmi da aka fesa tare da aikin injiniya, abin da ake buƙata don fineness ya fi girma saboda ɗan gajeren lokacin haɗuwa.

Har ila yau, tarar MC yana da wani tasiri a kan riƙewar ruwa. Gabaɗaya magana, ga methyl cellulose ethers tare da danko iri ɗaya amma lafiya daban-daban, a ƙarƙashin adadin ƙari iri ɗaya, mafi kyawun mafi kyawun mafi kyawun tasirin riƙewar ruwa.