Ma cellulose ether amatha kusintha kwambiri magwiridwe antchito a matope onyowa, ndipo ndi chowonjezera chachikulu chomwe chimakhudza ntchito yomanga matope. Kusankhidwa koyenera kwa ma cellulose ethers amitundu yosiyanasiyana, ma viscosity osiyanasiyana, makulidwe osiyanasiyana a tinthu, magawo osiyanasiyana a mamasukidwe akayendedwe ndi kuchuluka kowonjezera kudzakhala ndi zotsatira zabwino pakuchita bwino kwa matope owuma a ufa. Pakalipano, matope ambiri omanga ndi pulasitala sakhala ndi ntchito yabwino yosungira madzi, ndipo matope amadzi amalekanitsidwa pakangopita mphindi zochepa. Kusungirako madzi ndi ntchito yofunikira ya methyl cellulose ether, komanso ndikuchitanso komwe opanga matope ambiri am'nyumba, makamaka omwe ali kumadera akum'mwera komwe kumatentha kwambiri, amalabadira. Zomwe zimakhudza momwe madzi amasungiramo matope owuma a ufa amaphatikiza kuchuluka kwa kuwonjezera, mamasukidwe akayendedwe, fineness of particles, ndi kutentha kwa chilengedwe chogwiritsa ntchito.
Kusungirako madzi kwa cellulose ether
Popanga zida zomangira, makamaka matope a ufa wowuma, ether ya cellulose imagwira ntchito yosasinthika, makamaka popanga matope apadera (matope osinthidwa), ndi gawo lofunikira komanso lofunikira. Ntchito yofunika kwambiri ya madzi sungunuka mapadi etero mu matope makamaka ali mbali zitatu, mmodzi kwambiri madzi posungira mphamvu, wina ndi chikoka pa kusasinthasintha ndi thixotropy wa matope, ndipo chachitatu ndi mogwirizana ndi simenti. Mphamvu yosungira madzi ya cellulose ether imadalira kuyamwa kwamadzi kwa gawo loyambira, kapangidwe ka matope, makulidwe a matope, kuchuluka kwa madzi kwa matope, komanso nthawi yoyika zinthu. Kusungidwa kwamadzi kwa cellulose ether komweko kumachokera ku kusungunuka ndi kutaya madzi m'thupi kwa cellulose ether yokha. Monga ife tonse tikudziwa, ngakhale cellulose maselo unyolo muli ambiri hydratable OH magulu kwambiri hydratable, si sungunuka m'madzi, chifukwa mapadi kapangidwe ndi mkulu digiri crystallinity. Mphamvu ya hydration yamagulu a hydroxyl yokha sikokwanira kuphimba zomangira zamphamvu za haidrojeni ndi mphamvu za van der Waals pakati pa mamolekyu. Choncho, zimangotupa koma sizisungunuka m'madzi. Pamene cholowa m'malo anadzetsa mu unyolo maselo, osati m'malo kuwononga unyolo wa haidrojeni, komanso interchain wa haidrojeni chomangira anawonongedwa chifukwa wedging wa m'malo pakati moyandikana unyolo. Cholowa m'malo chimakhala chachikulu, ndiye kuti mtunda pakati pa mamolekyu ndi waukulu. Kuchuluka kwa mtunda. Zotsatira zazikulu za kuwononga zomangira za haidrojeni, cellulose ether imakhala yosungunuka m'madzi pambuyo poti latisi ya cellulose ikuchulukira ndipo yankho limalowa, ndikupanga yankho lapamwamba kwambiri. Kutentha kukakwera, hydration ya polima imafooka, ndipo madzi pakati pa maunyolo amathamangitsidwa. Pamene kuchepa madzi m'thupi zotsatira zokwanira, mamolekyu amayamba aggregate, kupanga atatu azithunzithunzi maukonde dongosolo gel osakaniza ndi apangidwe kunja.
Nthawi zambiri, kukwezeka kwa mamachulukidwe kumapangitsa kuti madzi asungidwe bwino. Komabe, kukwezeka kwa mamasukidwe apamwamba komanso kulemera kwa maselo, kuchepa kofananirako kusungunuka kwake kudzakhala ndi vuto lalikulu pa mphamvu ndi ntchito yomanga ya matope. The apamwamba mamasukidwe akayendedwe, ndi zoonekeratu kwambiri thickening zotsatira pa matope, koma si mwachindunji molingana. Kukwera kwa mamasukidwe akayendedwe, m'pamenenso matope onyowa amakhala owoneka bwino kwambiri, ndiye kuti, pakumanga, amawonetsedwa ngati kumamatira ku scraper ndi kumamatira kwakukulu ku gawo lapansi. Koma sizothandiza kuwonjezera mphamvu zamapangidwe a dothi lonyowa palokha. Pakumanga, ntchito yotsutsa-sag sizowonekera. M'malo mwake, ma viscosity ena apakati komanso otsika koma osinthidwa a methyl cellulose ethers ali ndi ntchito yabwino kwambiri pakuwongolera mphamvu zamapangidwe amatope onyowa.
Thickening ndi Thixotropy wa Cellulose Ether
Palinso ubale wabwino wa mzere pakati pa kusasinthika kwa phala la simenti ndi mlingo wa cellulose ether. Selulosi ether akhoza kwambiri kuonjezera mamasukidwe akayendedwe a matope. Mlingo waukulu kwambiri, zotsatira zake zimakhala zoonekeratu. High-viscosity cellulose ether amadzimadzi njira ali mkulu thixotropy, amenenso ndi khalidwe lalikulu la mapadi ether.
thickening zimadalira mlingo wa polymerization wa mapadi efa, njira ndende, kukameta ubweya mlingo, kutentha ndi zina. Katundu wa gelling wa yankho ndi wapadera kwa alkyl cellulose ndi zotuluka zake zosinthidwa. Makhalidwe a gelation amakhudzana ndi kuchuluka kwa m'malo, ndende ya yankho ndi zowonjezera. Kwa zotumphukira zosinthidwa za hydroxyalkyl, mawonekedwe a gel amalumikizananso ndi digiri yakusintha kwa hydroxyalkyl. Pakuti otsika mamasukidwe akayendedwe MC ndi HPMC, 10% -15% yankho akhoza kukonzekera, sing'anga mamasukidwe akayendedwe MC ndi HPMC akhoza kukonzekera 5% -10% yankho, pamene mkulu mamasukidwe akayendedwe MC ndi HPMC akhoza kukonzekera 2% -3% yankho, ndipo Kawirikawiri Gulu la mamasukidwe a cellulose ether limayikidwanso ndi 1% -2% yankho. High molecular kulemera cellulose ether ali mkulu thickening dzuwa. Munjira yofananira, ma polima okhala ndi zolemetsa zosiyanasiyana zama cell amakhala ndi ma viscosity osiyanasiyana. Madigiri apamwamba. Chandamale mamasukidwe akayendedwe angapezeke kokha ndi kuwonjezera kuchuluka otsika maselo kulemera cellulose ether. Kukhuthala kwake kumadalira pang'ono kumeta ubweya wa ubweya, ndipo kukhuthala kwapamwamba kumafika kukhuthala kwa chandamale, ndipo kuchuluka komwe kumafunikira kumakhala kochepa, ndipo kukhuthala kumadalira kukhuthala kwamphamvu. Choncho, kuti akwaniritse kusasinthasintha kwina, kuchuluka kwa cellulose ether (kukhazikika kwa yankho) ndi kukhuthala kwa yankho ziyenera kutsimikiziridwa. Kutentha kwa gel osakaniza kumachepetsanso mofanana ndi kuwonjezeka kwa ndende ya yankho, ndi gel osakaniza kutentha kwa firiji atatha kufika pamtundu wina. The gelling ndende ya HPMC ndi mkulu kutentha firiji.
Kuchedwa kwa Cellulose Ether
Ntchito yachitatu ya cellulose ether ndikuchedwetsa njira ya hydration ya simenti. Ma cellulose ether amawonjezera matope okhala ndi zinthu zosiyanasiyana zopindulitsa, komanso amachepetsa kutentha koyambirira kwa simenti ndikuchedwetsa hydration dynamic process ya simenti. Izi sizothandiza kugwiritsa ntchito matope m'madera ozizira. Kuchedwetsaku kumachitika chifukwa cha kutengeka kwa ma cellulose ether mamolekyu pa zinthu za hydration monga CSH ndi ca(OH)2. Chifukwa cha kuchuluka kwa mamasukidwe akayendedwe a pore yankho, mapadi ether amachepetsa kuyenda kwa ayoni mu yankho, potero kuchedwa hydration ndondomeko. Kuchulukirachulukira kwa cellulose ether mu mineral gel zakuthupi, m'pamenenso zimawonekera kwambiri kuchedwa kwa hydration. Cellulose ether sikungochedwetsa kukhazikitsa, komanso kuchedwetsa kuuma kwa dongosolo la matope a simenti. The retarding zotsatira za cellulose ether zimadalira ndende yake mu mchere gel osakaniza dongosolo, komanso dongosolo mankhwala. Kukwera kwa methylation ya HEMC, kumapangitsanso kuchepa kwa cellulose ether. Chiŵerengero cha m'malo mwa hydrophilic m'malo mwa madzi ochulukirapo. Komabe, kukhuthala kwa cellulose ether sikukhudza kwenikweni ma kinetics a simenti.
Mumatope, cellulose ether imagwira ntchito yosunga madzi, kukhuthala, kuchedwetsa mphamvu ya simenti ya simenti, ndikuwongolera ntchito yomanga. Kusunga madzi abwino kumapangitsa kuti simenti ikhale yokwanira, imatha kusintha kukhuthala konyowa kwamatope, kuonjezera mphamvu yomangirira yamatope, ndikusintha nthawi. Kuonjezera cellulose ether ku makina kupopera matope matope akhoza kupititsa patsogolo kupopera kapena kupopera ntchito ndi structural mphamvu ya matope. Chifukwa chake, ether ya cellulose ikugwiritsidwa ntchito kwambiri ngati chowonjezera chofunikira mumatope osakaniza okonzeka
Nthawi yotumiza: Dec-26-2022