Hydroxypropylmethylcellulose

Mwachidule: amatchedwa HPMC, woyera kapena woyera fibrous kapena granular ufa. Pali mitundu yambiri ya cellulose ndipo imagwiritsidwa ntchito kwambiri, koma timalumikizana kwambiri ndi makasitomala mumakampani opanga zida zomangira ufa. Ma cellulose ambiri amatanthauza hypromellose.

Kupanga: The zopangira waukulu wa HPMC: woyengedwa thonje, methyl kolorayidi, propylene okusayidi, zopangira zina monga flake alkali, asidi, toluene, isopropanol, etc. Kuchitira woyengeka thonje mapadi ndi alkali njira pa 35-40 ℃ kwa theka la ola, atolankhani, pulverize ndi mapaipi a cellulose 35, ndi pafupifupi zaka analandira mapadi 35 ℃ ndi bwino zaka Ulusi wa alkali uli mkati mwazofunikira. Ikani ulusi wa alkali mu ketulo ya etherification, onjezerani propylene oxide ndi methyl chloride motsatira, ndi etherify pa 50-80 ° C kwa maola 5, ndi kuthamanga kwakukulu kwa pafupifupi 1.8 MPa. Kenaka yikani mlingo woyenera wa hydrochloric acid ndi oxalic acid kumadzi otentha pa 90 ° C kuti mutsuke zinthuzo kuti muwonjezere voliyumuyo. Dehydrate ndi centrifuge. Sambani mpaka osalowerera ndale, ndipo chinyontho chikakhala chochepera 60%, chiumeni ndi mpweya wotentha wa 130 ° C mpaka 5%. Ntchito: kusunga madzi, kukhuthala, thixotropic anti-sag, air-entraining workability, retarding setting.

Kusunga madzi: Kusunga madzi ndi chinthu chofunikira kwambiri cha cellulose ether! Popanga matope a putty gypsum ndi zinthu zina, kugwiritsa ntchito cellulose ether ndikofunikira. Kusungidwa kwamadzi kwambiri kumatha kuchitapo kanthu mokwanira phulusa la simenti ndi calcium gypsum (pamene zimachitikira mokwanira, mphamvu zake zimakulirakulira). Pazifukwa zomwezo, kuwonjezereka kwa kukhuthala kwa cellulose ether, kumapangitsa kuti madzi asungidwe bwino (mpata womwe uli pamwamba pa 100,000 viscosity umakhala wochepa); Kuchuluka kwa mlingo, kumapangitsa kuti madzi asungidwe bwino, nthawi zambiri kachulukidwe kakang'ono ka cellulose ether kumatha kusintha kwambiri ntchito ya matope. Kuchuluka kwa madzi osungira madzi, pamene zomwe zilipo zifika pamlingo wina, chizolowezi chowonjezera madzi osungira madzi chimakhala chochepa; kuchuluka kwa kasungidwe ka madzi ka cellulose ether nthawi zambiri kumachepa kutentha kozungulira kumawonjezeka, koma ma ether ena a cellulose apamwamba amakhalanso ndi magwiridwe antchito abwino kwambiri pakatentha kwambiri. Kusunga madzi. The interdiffusion pakati mamolekyu madzi ndi mapadi etero maselo unyolo zimathandiza mamolekyulu madzi kulowa mkati mwa mapalo etere macromolecular unyolo ndi kulandira amphamvu kumanga mphamvu, potero kupanga madzi aulere, entangling madzi, ndi kuwongolera madzi posungira simenti slurry.

Kukhuthala, thixotropic ndi anti-sag: kumapereka mamasukidwe abwino kwambiri kumatope onyowa! Itha kukulitsa kwambiri kumamatira pakati pa matope onyowa ndi matope oyambira, ndikuwongolera magwiridwe antchito amatope a anti-sagging. Kukhuthala kwa ma cellulose ethers kumawonjezeranso kukana kwa kubalalitsidwa komanso kusakanikirana kwa zinthu zomwe zangosakanikirana, kuteteza delamination, tsankho ndi magazi. Kuchulukana kwa ma cellulose ethers pazida zopangira simenti kumachokera ku viscosity ya ma cellulose ether solution. Pazifukwa zomwezo, kuwonjezereka kwa kukhuthala kwa cellulose ether, kumapangitsanso kukhuthala kwa zinthu zosinthidwa simenti, koma ngati mamasukidwe ake ndiakulu kwambiri, zimakhudza kutulutsa ndi kugwiritsira ntchito kwa zinthuzo (monga trowel yomata ndi batch scraper). zovuta). Mtondo wodziyimira pawokha ndi konkriti wodziphatikizira womwe umafunikira madzi ochulukirapo amafunikira kukhuthala kochepa kwa cellulose ether. Kuphatikiza apo, kukhuthala kwa cellulose ether kumawonjezera kufunikira kwamadzi pazinthu zopangira simenti ndikuwonjezera zokolola zamatope. Mkulu mamasukidwe akayendedwe mapadi etere amadzimadzi njira ali mkulu thixotropy, amenenso ndi khalidwe lalikulu la mapadi efa. Amadzimadzi zothetsera mapadi zambiri pseudoplastic, sanali thixotropic otaya katundu m'munsimu awo gel osakaniza kutentha, koma Newtonian otaya katundu pa otsika kukameta ubweya mitengo. Pseudoplasticity imawonjezeka ndi kuchuluka kwa kulemera kwa maselo kapena kuchuluka kwa cellulose ether. Ma gels apangidwe amapangidwa pamene kutentha kumawonjezeka, ndipo kutuluka kwapamwamba kwa thixotropic kumachitika. Ma cellulose ether okhala ndi kuchuluka kwambiri komanso kutsika kwamakhuthala otsika amawonetsa thixotropy ngakhale pansi pa kutentha kwa gel osakaniza. Katunduyu ndiwothandiza kwambiri pakumanga matope omangira kuti asinthe masinthidwe ake ndi kugwa kwake. Kuyenera kudziŵika apa kuti apamwamba mamasukidwe akayendedwe a mapadi efa, ndi bwino kusunga madzi, koma kukhuthala kwapamwamba, ndi apamwamba wachibale maselo kulemera kwa mapadi efa, ndi kuchepa lolingana mu solubility ake, amene ali ndi zotsatira zoipa pa matope ndende ndi workability.

Choyambitsa: Ma cellulose ether ali ndi mphamvu zodziwikiratu zopatsa mpweya pazinthu zatsopano za simenti. Ma cellulose ether ali ndi gulu la hydrophilic (gulu la hydroxyl, gulu la ether) ndi gulu la hydrophobic (gulu la methyl, mphete ya glucose), ndi surfactant, limagwira ntchito pamtunda, motero limakhala ndi mphamvu yolowera mpweya. Mphamvu ya mpweya wa cellulose ether idzatulutsa zotsatira za "mpira", zomwe zingathe kupititsa patsogolo ntchito ya zinthu zatsopano zosakanikirana, monga kuonjezera pulasitiki ndi kusalala kwa matope panthawi yogwira ntchito, zomwe zimapindulitsa pakupanga matope; zidzawonjezeranso kutuluka kwa matope. , kuchepetsa mtengo wopangira matope; koma idzawonjezera porosity ya zinthu zowumitsidwa ndikuchepetsa mphamvu zake zamakina monga mphamvu ndi zotanuka modulus. Monga surfactant, mapadi ether alinso wetting kapena lubricating kwenikweni pa particles simenti, amene pamodzi ndi zotsatira zake mpweya-entraining kumawonjezera fluidity wa zipangizo simenti ofotokoza, koma thickening zotsatira kuchepetsa fluidity. Zotsatira za kuyenda ndi kuphatikiza kwa plasticizing ndi thickening zotsatira. Pamene zomwe zili mu cellulose ether ndizochepa kwambiri, zimawonetsedwa makamaka ngati pulasitiki kapena kuchepetsa madzi; pamene zili pamwamba, kukhuthala kwa cellulose ether kumawonjezeka mofulumira, ndipo zotsatira zake zolowetsa mpweya zimakhala zodzaza, choncho ntchitoyo imawonjezeka. Kuchulukitsa kapena kuchuluka kwa madzi.

Kuchedwetsa kuchedwa: Cellulose ether ikhoza kuchedwetsa njira ya hydration ya simenti. Ma cellulose ethers amapatsa matope ndi zinthu zosiyanasiyana zopindulitsa, komanso amachepetsa kutentha kwa simenti koyambirira komanso kuchedwetsa hydration kinetic 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 solution, cellulose ether imachepetsa kusuntha kwa ayoni mu yankho, potero kuchedwetsa njira ya hydration. Kuchulukirachulukira kwa cellulose ether mu mineral gel zakuthupi, m'pamenenso zimawonekera kwambiri kuchedwa kwa hydration. Ma cellulose ether sikuti amangochepetsa kukhazikika, komanso amachepetsa kuuma kwa dongosolo lamatope a simenti. The retardation 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. The retardation zotsatira ndi wamphamvu. Komabe, mamasukidwe akayendedwe a cellulose ether alibe mphamvu pang'ono pa hydration kinetics ya simenti. Ndi kuwonjezeka kwa cellulose ether okhutira, kuika nthawi ya matope kumawonjezeka kwambiri. Pali mgwirizano wabwino wosagwirizana pakati pa nthawi yoyamba yoyika matope ndi zomwe zili mu cellulose ether, ndipo nthawi yomaliza yokonzekera imakhala ndi mgwirizano wabwino wa mzere ndi zomwe zili mu cellulose ether. Titha kuwongolera nthawi yogwiritsira ntchito matope mwa kusintha zomwe zili mu cellulose ether. Pogulitsa, imagwira ntchito yosunga madzi, kukhuthala, kuchedwetsa mphamvu ya simenti ya simenti, ndikuwongolera ntchito yomanga. Kuchuluka kwa madzi osungira madzi kumapangitsa kuti simenti ya gypsum phulusa kashiamu izichita bwino kwambiri, kumawonjezera kukhuthala konyowa, kumapangitsa kuti matope asamayende bwino, ndipo nthawi yomweyo amatha kupititsa patsogolo mphamvu zolimba komanso kumeta ubweya, kuwongolera kwambiri zomangamanga komanso kugwira ntchito moyenera. Nthawi yosinthika. Kupititsa patsogolo kupopera kapena kupopera kwamatope, komanso mphamvu zamapangidwe. Munjira yeniyeni yogwiritsira ntchito, ndikofunikira kudziwa mtundu, kukhuthala, ndi kuchuluka kwa cellulose molingana ndi zinthu zosiyanasiyana, kamangidwe kake, komanso chilengedwe.