Mu kapangidwe ka dothi la ufa wowuma,cellulose etherndi chowonjezera chofunikira chokhala ndi kuchuluka kwapang'onopang'ono, koma chingathe kusintha kwambiri kusakaniza ndi kumanga ntchito yamatope. Kunena mwachidule, pafupifupi zonse zonyowa zosakaniza zamatope zomwe zimatha kuwonedwa ndi maso amaperekedwa ndi cellulose ether. Ndiwochokera ku cellulose yomwe imapezeka pogwiritsa ntchito cellulose kuchokera ku nkhuni ndi thonje, kuchitapo kanthu ndi caustic soda, kenako ndi etherifying ndi etherifying agent.
Mitundu ya ma cellulose ethers
A. Hydroxypropyl methyl cellulose (HPMC), yomwe imapangidwa makamaka ndi thonje yoyengedwa kwambiri ngati yaiwisi, imakhala ndi etherified mwapadera pansi pamikhalidwe yamchere.
B. Hydroxyethyl methylcellulose (HEMC), ether yopanda ionic cellulose, ndi mawonekedwe oyera a ufa, osanunkhiza komanso osakoma.
C. Hydroxyethyl cellulose (HEC), chosakhala ndi ionic, choyera m'mawonekedwe, chosanunkha, chosakoma komanso chosavuta kuyenda.
Pamwambapa ndi ma ethers omwe si a ionic cellulose, ndi ma ionic cellulose ethers (monga carboxymethyl cellulose CMC).
Pa ntchito youma ufa matope, chifukwa ayoni mapadi (CMC) ndi wosakhazikika pamaso pa ayoni kashiamu, ndi kawirikawiri ntchito inorganic gelling kachitidwe ndi simenti ndi slaked laimu monga cementing zipangizo. M'malo ena ku China, ma putty ena mkati mwakhoma okonzedwa ndi wowuma wosinthidwa ngati zida zazikulu zomangira simenti ndi ufa wa Shuangfei monga zodzaza zimagwiritsa ntchito CMC ngati chokhuthala. Komabe, chifukwa mankhwalawa amakhala ndi mildew ndipo sagonjetsedwa ndi madzi, amachotsedwa pang'onopang'ono ndi msika. Pakadali pano, ether ya cellulose yomwe imagwiritsidwa ntchito kwambiri ku China ndi HPMC.
Cellulose ether imagwiritsidwa ntchito makamaka ngati chosungira madzi komanso chokhuthala muzinthu zopangidwa ndi simenti.
Ntchito yake yosungira madzi imatha kulepheretsa gawo lapansi kuti lisatenge madzi ochulukirapo ndikulepheretsa kutuluka kwa madzi, kuti zitsimikizire kuti simenti ili ndi madzi okwanira pamene ili ndi madzi. Tengani ntchito pulasitala monga chitsanzo. Pamene slurry wamba simenti ikugwiritsidwa ntchito pamunsi pamwamba, youma ndi porous gawo lapansi mwamsanga kuyamwa madzi ochuluka kuchokera slurry, ndi simenti slurry wosanjikiza pafupi ndi maziko wosanjikiza mosavuta kutaya madzi zofunika hydration. , kotero osati sangakhoze kupanga simenti gel osakaniza ndi kugwirizana mphamvu pamwamba pa gawo lapansi, komanso sachedwa warping ndi madzi seepage, kuti pamwamba simenti slurry wosanjikiza n'zosavuta kugwa. Pamene grout yomwe imagwiritsidwa ntchito imakhala yopyapyala, zimakhalanso zosavuta kupanga ming'alu mu grout yonse. Chifukwa chake, m'mbuyomu kupaka pulasitala, madzi nthawi zambiri amagwiritsidwa ntchito kunyowetsa gawo lapansi poyamba, koma ntchitoyi sikuti imangogwira ntchito komanso imatenga nthawi, komanso magwiridwe antchito ndi ovuta kuwongolera.
Nthawi zambiri, kusungidwa kwa madzi a simenti slurry kumawonjezeka ndi kuchuluka kwa zomwe zili mu cellulose ether. Kuchuluka kwa kukhuthala kwa cellulose ether yowonjezeredwa, kumapangitsa kuti madzi asungidwe bwino.
Kuphatikiza pa kusungirako madzi ndi kukhuthala, cellulose ether imakhudzanso zinthu zina za matope a simenti, monga kubweza, kulowetsa mpweya, ndi kuwonjezereka kwa mgwirizano. Cellulose ether imachepetsa kuyika ndi kuuma kwa simenti, motero kumatalikitsa nthawi yogwira ntchito. Chifukwa chake, nthawi zina amagwiritsidwa ntchito ngati coagulant.
Ndi chitukuko cha matope osakaniza owuma,cellulose etherchakhala chinthu chofunika kwambiri chosakaniza matope a simenti. Komabe, pali mitundu yambiri ndi mawonekedwe a cellulose ether, ndipo mtundu pakati pa magulu umasinthasintha.
Nthawi yotumiza: Apr-25-2024