Mmene kutentha yozungulira pa workability wa mapadi etere kusinthidwa gypsum

Ntchito ya cellulose etere kusinthidwa gypsum pa kutentha yozungulira osiyana kwambiri, koma limagwirira ake si bwino. Zotsatira za cellulose ether pa magawo a rheological ndi kusunga madzi a gypsum slurry pa kutentha kosiyanasiyana kozungulira adaphunzira. The hydrodynamic m'mimba mwake wa cellulose ether mu madzi gawo anayeza ndi zazikulu kuwala kubalalitsa njira, ndi mphamvu limagwirira anafufuza. Zotsatira zikuwonetsa kuti cellulose ether imakhala ndi madzi abwino osungira komanso kukhuthala pa gypsum. Ndi kuchuluka kwa cellulose ether, kukhuthala kwa slurry kumawonjezeka ndipo mphamvu yosungira madzi imawonjezeka. Komabe, ndi kuwonjezeka kwa kutentha, mphamvu yosungira madzi ya gypsum slurry yosinthidwa imachepa, ndipo magawo a rheological amasinthanso. Poganizira kuti mgwirizano wa cellulose ether colloid ukhoza kukwaniritsa kusungirako madzi mwa kuletsa njira yoyendetsera madzi, kutentha kwa kutentha kungayambitse kusokonezeka kwa mgwirizano waukulu wopangidwa ndi cellulose ether, motero kuchepetsa kusungidwa kwa madzi ndi ntchito yogwira ntchito ya gypsum yosinthidwa.

Mawu ofunikira:gypsum; Cellulose ether; Kutentha; Kusunga madzi; rheology

0. Chiyambi

Gypsum, monga mtundu wazinthu zokometsera zachilengedwe zomanga bwino komanso zowoneka bwino, zimagwiritsidwa ntchito kwambiri pantchito zokongoletsa. Pogwiritsira ntchito zipangizo za gypsum, wosungira madzi nthawi zambiri amawonjezeredwa kuti asinthe slurry kuti madzi asawonongeke panthawi ya hydration ndi kuumitsa. Cellulose ether ndiye chogwiritsidwa ntchito kwambiri posunga madzi pakali pano. Chifukwa ionic CE idzachita ndi Ca2+, nthawi zambiri imagwiritsa ntchito non-ionic CE, monga: hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether ndi methyl cellulose ether. Ndikofunika kuti muphunzire za cellulose ether gypsum yosinthidwa kuti mugwiritse ntchito bwino gypsum mu engineering engineering.

Selulosi ether ndi mkulu maselo pawiri opangidwa ndi mmene alkali mapadi ndi etherifying agent pansi pa zinthu zina. Nonionic cellulose ether yomwe imagwiritsidwa ntchito pomanga zomangamanga imakhala ndi kubalalitsidwa kwabwino, kusunga madzi, kulumikizana ndi kukhuthala. Kuwonjezera kwa cellulose ether kumakhala ndi zotsatira zoonekeratu pa kusungirako madzi kwa gypsum, koma kupindika ndi kukakamiza mphamvu ya thupi lolimba la gypsum kumachepetsanso pang'ono ndi kuwonjezeka kwa kuchuluka kwa kuwonjezera. Izi ndichifukwa choti cellulose ether imakhala ndi mphamvu yolumikizira mpweya, yomwe imayambitsa thovu panthawi ya kusanganikirana kwa slurry, motero kuchepetsa mphamvu yamakina a thupi lowumitsidwa. Pa nthawi yomweyi, ether ya cellulose yochuluka imapangitsa kuti gypsum mix ikhale yomamatira, zomwe zimapangitsa kuti ntchito yake yomanga ikhale yovuta.

The hydration ndondomeko gypsum akhoza kugawidwa mu masitepe anayi: Kutha kwa kashiamu sulfate hemihydrate, crystallization nucleation wa calcium sulphate dihydrate, kukula kwa crystalline phata ndi mapangidwe crystalline dongosolo. Mu hydration ndondomeko gypsum, ndi hydrophilic zinchito gulu la mapadi efa adsorbing padziko gypsum particles adzakonza mbali ya mamolekyu amadzi, motero kuchedwa ndi nucleation ndondomeko ya gypsum hydration ndi kuwonjezera nthawi yokhazikitsa gypsum. Kupyolera mu kuwona kwa SEM, Mroz adapeza kuti ngakhale kukhalapo kwa cellulose ether kunachedwetsa kukula kwa makristasi, koma kumawonjezera kuphatikizika ndi kuphatikizika kwa makristasi.

Ma cellulose ether ali ndi magulu a hydrophilic kotero kuti ali ndi hydrophilicity, polima unyolo wautali wolumikizana wina ndi mnzake kuti ukhale ndi kukhuthala kwakukulu, kuyanjana kwa awiriwa kumapangitsa mapadi kukhala ndi zotsatira zabwino zosunga madzi ochulukirapo pa gypsum mix. Bulichen anafotokoza njira yosungira madzi ya cellulose ether mu simenti. Pakusakanikirana pang'ono, cellulose ether adsorb pa simenti kuti amwe madzi mu intramolecular ndikutsagana ndi kutupa kuti akwaniritse kusunga madzi. Panthawi imeneyi, kusungirako madzi kumakhala koipa. Mlingo waukulu, cellulose ether ipanga mazana a nanometers ku ma microns ochepa a colloidal polima, kutsekereza dongosolo la gel osakaniza mu dzenje, kuti akwaniritse kusunga bwino madzi. Kachitidwe ka cellulose ether mu gypsum ndi chimodzimodzi ndi simenti, koma kuchuluka kwa SO42- ndende mu gawo lamadzimadzi la gypsum slurry kudzafooketsa mphamvu yosunga madzi ya cellulose.

Kutengera zomwe zili pamwambazi, zitha kupezeka kuti kafukufuku wapano pa cellulose etha kusinthidwa gypsum makamaka amayang'ana pa hydration process ya cellulose ether pa gypsum mix, katundu wosungira madzi, zida zamakina ndi microstructure ya thupi lowuma, ndi makina a cellulose ether. kusunga madzi. Komabe, kafukufuku wokhudzana ndi kuyanjana pakati pa cellulose ether ndi gypsum slurry pa kutentha kwakukulu akadali osakwanira. Ma cellulose etha amadzimadzi njira adzakhala gelatinize pa enieni kutentha. Pamene kutentha ukuwonjezeka, ndi mamasukidwe akayendedwe a mapadi etere amadzimadzi njira pang`onopang`ono kuchepa. Pamene kutentha kwa gelatinization kwafika, cellulose ether imalowetsedwa mu gel yoyera. Mwachitsanzo, pomanga chilimwe, kutentha kozungulira kumakhala kwakukulu, gel osakaniza katundu wa cellulose ether amayenera kutsogolera kusintha kwa magwiridwe antchito a gypsum slurry. Ntchitoyi imayang'ana zotsatira za kukwera kwa kutentha pakugwira ntchito kwa cellulose etere kusinthidwa gypsum zakuthupi kudzera muzoyeserera mwadongosolo, ndipo imapereka chitsogozo chogwiritsa ntchito gypsum ya cellulose etere.

1. Yesani

1.1 Zida Zopangira

Gypsum ndi mtundu wa β-gypsum womanga zachilengedwe woperekedwa ndi Beijing Ecological Home Group.

Ma cellulose etha osankhidwa kuchokera ku Shandong Yiteng Gulu la hydroxypropyl methyl cellulose ether, zofotokozera za 75,000 mPa·s, 100,000 mPa·s ndi 200000mPa · s, kutentha kwa gelation pamwamba pa 60 ℃. Citric acid idasankhidwa ngati gypsum retarder.

1.2 Mayeso a Rheology

Chida choyesera cha rheological chomwe chinagwiritsidwa ntchito chinali RST⁃CC rheometer yopangidwa ndi BROOKFIELD USA. Magawo achilengedwe monga pulasitiki viscosity ndi zokolola za shear stress of gypsum slurry zidatsimikiziridwa ndi chidebe chachitsanzo cha MBT⁃40F⁃0046 ndi CC3⁃40 rotor, ndipo deta idakonzedwa ndi pulogalamu ya RHE3000.

Makhalidwe a gypsum mix amagwirizana ndi machitidwe a rheological a Bingham fluid, omwe nthawi zambiri amaphunzira pogwiritsa ntchito chitsanzo cha Bingham. Komabe, chifukwa cha pseudoplasticity ya cellulose ether yowonjezeredwa ku gypsum yosinthidwa ndi polima, kusakaniza kwa slurry nthawi zambiri kumapereka katundu wina wometa ubweya wa ubweya. Pankhaniyi, mtundu wosinthidwa wa Bingham (M⁃B) utha kufotokozera bwino mayendedwe opindika a gypsum. Pofuna kuphunzira kumeta ubweya wa gypsum, ntchitoyi imagwiritsanso ntchito chitsanzo cha Herschel⁃Bulkley (H⁃B).

1.3 Kuyesa kusunga madzi

Njira yoyesera imatchula GB/T28627⁃2012 Plastering Plaster. Panthawi yoyesera kutentha ngati kusinthasintha, gypsum idatenthedwa pasadakhale 1h pasadakhale kutentha kofananira mu uvuni, ndipo madzi osakanikirana omwe amagwiritsidwa ntchito poyeserera anali preheated 1h mu kutentha kofananira mukusamba kwamadzi nthawi zonse, ndi chida chogwiritsidwa ntchito. anali atatenthedwa.

Mayeso a 1.4 Hydrodynamic m'mimba mwake

The hydrodynamic m'mimba mwake (D50) wa HPMC polima mgwirizano mu madzi gawo anayeza ntchito zazikulu kuwala kumwaza tinthu kukula analyzer (Malvern Zetasizer NanoZS90).

2. Zotsatira ndi zokambirana

2.1 Rheological katundu wa HPMC kusinthidwa gypsum

Kukhuthala kowonekera ndi chiŵerengero cha kumeta ubweya wa ubweya ndi kumeta ubweya wamadzimadzi ndipo ndi chizindikiro chosonyeza kutuluka kwa madzi omwe si a Newtonian. Kuwoneka kowoneka bwino kwa gypsum slurry kusinthidwa ndi zomwe zili mu cellulose ether pansi pazigawo zitatu zosiyana (75000mPa·s, 100,000mpa ·s ndi 200000mPa·s). Kutentha kwa mayeso kunali 20 ℃. Pamene kumeta ubweya wa rheometer ndi 14min-1, zikhoza kupezeka kuti kukhuthala kwa gypsum slurry kumawonjezeka ndi kuwonjezeka kwa kuphatikizidwa kwa HPMC, ndipo kukwezedwa kwa HPMC kumawoneka bwino, kuwonjezereka kwa kukhuthala kwa gypsum slurry kudzakhala kokwera. Izi zikuwonetsa kuti HPMC ili ndi kukhuthala koonekera bwino komanso kukhudzika kwa viscosification pa gypsum slurry. Gypsum slurry ndi cellulose ether ndi zinthu zomwe zimakhala ndi viscosity. Mu kusakaniza gypsum kusakaniza, mapadi etere ndi adsorbed padziko gypsum hydration mankhwala, ndi maukonde opangidwa ndi mapadi etere ndi maukonde opangidwa ndi gypsum kusakaniza ndi interwoven, chifukwa mu "superposition effect", amene kwambiri bwino kukhuthala wonse wa zida zosinthidwa za gypsum.

Ma shear ⁃ stress curves of pure gypsum (G⁃H) and modified gypsum (G⁃H) paste doped with 75000mPa· s-HPMC, monga momwe atengera chitsanzo chosinthidwa cha Bingham (M⁃B). Zitha kupezeka kuti ndi kuwonjezeka kwa kumeta ubweya wa ubweya, kumeta ubweya wa kusakaniza kumawonjezeranso. The pulasitiki mamasukidwe akayendedwe (ηp) ndi zokolola kukameta ubweya maganizo (τ0) mfundo za gypsum koyera ndi HPMC kusinthidwa gypsum pa kutentha osiyana amapezeka.

Kuchokera ku pulasitiki mamasukidwe akayendedwe (ηp) ndi zokolola kukameta ubweya maganizo (τ0) mfundo za gypsum koyera ndi HPMC kusinthidwa gypsum pa kutentha osiyana, zikhoza kuoneka kuti zokolola maganizo a HPMC kusinthidwa gypsum adzakhala kuchepa mosalekeza ndi kuwonjezeka kutentha, ndi zokolola. kupsinjika kudzatsika 33% pa ​​60 ℃ poyerekeza ndi 20 ℃. Poyang'ana pulasitiki kukhuthala pamapindikira, zitha kupezeka kuti kukhuthala kwa pulasitiki kusinthidwa kwa gypsum slurry kumachepanso ndi kuwonjezeka kwa kutentha. Komabe, zokolola maganizo ndi pulasitiki mamasukidwe akayendedwe koyera gypsum slurry kuwonjezeka pang'ono ndi kuwonjezeka kutentha, zomwe zimasonyeza kuti kusintha magawo rheological wa HPMC kusinthidwa gypsum slurry m`kati kutentha kuwonjezeka chifukwa cha kusintha kwa HPMC katundu.

Mtengo wa kupsinjika kwa zokolola za gypsum slurry umawonetsa kuchuluka kwa kumeta ubweya wa ubweya pamene slurry imakana kumeta ubweya wa ubweya. Kuchuluka kwa kupsinjika kwa zokolola, m'pamenenso gypsum slurry ikhoza kukhala yokhazikika. Kukhuthala kwa pulasitiki kumawonetsa kusinthika kwa gypsum slurry. Kukula kwa kukhuthala kwa pulasitiki ndikotalikirapo, nthawi yayitali ya kumeta ubweya wa slurry idzakhala. Pomaliza, magawo awiri a rheological a HPMC osinthidwa gypsum slurry amachepetsa mwachiwonekere ndi kuwonjezeka kwa kutentha, ndipo kukhuthala kwa HPMC pa gypsum slurry kumachepa.

Kumeta ubweya wa slurry kumatanthawuza kumeta ubweya wa ubweya kapena kumeta ubweya wa ubweya wonyezimira womwe umawonetsedwa ndi slurry pamene akumeta ubweya. Zotsatira za kumeta ubweya wa slurry zitha kuweruzidwa ndi pseudoplastic index n yomwe imapezeka pamapindikira oyenerera. Pamene n <1, gypsum slurry imasonyeza kumeta ubweya wa ubweya, ndipo kumeta ubweya wa ubweya wa gypsum slurry kumakhala pamwamba ndi kuchepa kwa n. Pamene n> 1, gypsum slurry inasonyeza kumeta ubweya wa ubweya, ndipo kumeta ubweya wa ubweya wa gypsum slurry ukuwonjezeka ndi kuwonjezeka kwa n. Ma curve opindika a HPMC osinthidwa gypsum slurry pa kutentha kosiyana kutengera mtundu wa Herschel⁃Bulkley (H⁃B), motero amapeza pseudoplastic index n ya HPMC modified gypsum slurry.

Malinga ndi pseudoplastic index n ya HPMC kusinthidwa gypsum slurry, kukameta ubweya wa gypsum slurry wosakanikirana ndi HPMC ndi kukameta ubweya wa ubweya, ndipo n phindu limawonjezeka pang'onopang'ono ndi kuwonjezeka kwa kutentha, zomwe zimasonyeza kuti kumeta ubweya wa ubweya wa HPMC kusinthidwa gypsum kudzakhala kovuta. kukhala wofooka pamlingo wakutiwakuti ukakhudzidwa ndi kutentha.

Kutengera kusinthika kowoneka bwino kwa kukhuthala kwa gypsum slurry yosinthidwa ndi kumeta ubweya wa ubweya wowerengedwa kuchokera ku data ya kumeta ubweya wa 75000 mPa · HPMC pa kutentha kosiyana, zitha kupezeka kuti kukhuthala kwa pulasitiki wa gypsum slurry wosinthidwa kumachepa mwachangu ndi kuchuluka kwa kukameta ubweya, zomwe zimatsimikizira zotsatira zoyenera za mtundu wa H⁃B. Mawonekedwe osinthika a gypsum slurry adawonetsa kumeta ubweya wa ubweya. Ndi kuwonjezeka kwa kutentha, mawonekedwe owoneka bwino a kusakaniza amachepetsa pang'onopang'ono pa mlingo wochepa wa kukameta ubweya, zomwe zimasonyeza kuti kumeta ubweya wa ubweya wa gypsum slurry wosinthidwa kumachepa.

Pogwiritsira ntchito gypsum putty, gypsum slurry imayenera kukhala yosavuta kupunduka pakupukuta ndikukhalabe okhazikika pa mpumulo, zomwe zimafuna gypsum slurry kukhala ndi makhalidwe abwino ometa ubweya wa ubweya, ndi kumeta ubweya wa ubweya wa HPMC wosinthidwa gypsum ndi osowa. kumlingo wakutiwakuti, zomwe sizothandiza pomanga zida za gypsum. The mamasukidwe akayendedwe a HPMC ndi chimodzi mwa magawo ofunika, komanso chifukwa chachikulu chimene chimagwira ntchito ya thickening kusintha makhalidwe osiyanasiyana otaya kusakaniza. Ma cellulose ether ali ndi mphamvu ya gel yotentha, kukhuthala kwake kwamadzimadzi kumachepa pang'onopang'ono pamene kutentha kumawonjezeka, ndipo gel osakaniza amalowa pamene akufika kutentha kwa gelation. Kusintha kwa rheological magawo a mapadi etere kusinthidwa gypsum ndi kutentha zimagwirizana kwambiri ndi kusintha mamasukidwe akayendedwe, chifukwa thickening zotsatira ndi chifukwa cha superposition wa mapadi efa ndi wosanganiza slurry. Muukadaulo wothandiza, kukhudzidwa kwa kutentha kwa chilengedwe pakuchita kwa HPMC kuyenera kuganiziridwa. Mwachitsanzo, kutentha kwa zinthu zopangira kuyenera kuwongoleredwa pakutentha kwambiri m'chilimwe kuti mupewe kusagwira bwino ntchito kwa gypsum yosinthidwa chifukwa cha kutentha kwambiri.

2.2 Kusunga madzi kwaHPMC yosinthidwa gypsum

Kusungidwa kwa madzi kwa gypsum slurry kusinthidwa ndi mitundu itatu yosiyana ya cellulose ether kumasinthidwa ndi piritsi la mlingo. Ndi kuwonjezeka kwa mlingo wa HPMC, kuchuluka kwa madzi osungira madzi a gypsum slurry kumakhala bwino, ndipo kuwonjezeka kumakhala kokhazikika pamene mlingo wa HPMC ufika 0.3%. Pomaliza, madzi osungira madzi a gypsum slurry ndi okhazikika pa 90% ~ 95%. Izi zikuwonetsa kuti HPMC ili ndi zotsatira zodziwikiratu zosunga madzi pamiyala yamiyala, koma kusungirako madzi sikuli bwino kwambiri pamene mlingo ukukulirakulira. Mafotokozedwe atatu a HPMC madzi posungira madzi kusiyana si lalikulu, mwachitsanzo, pamene zili 0.3%, madzi posungira mlingo osiyanasiyana 5%, kupatuka muyezo ndi 2.2. The HPMC ndi mamasukidwe akayendedwe apamwamba si mlingo wapamwamba posungira madzi, ndi HPMC ndi kukhuthala otsika kwambiri si mlingo wotsika madzi posungira. Komabe, poyerekeza ndi gypsum yoyera, kuchuluka kwa madzi osungiramo madzi a HPMC atatu a gypsum slurry kumakhala bwino kwambiri, ndipo kuchuluka kwa madzi a gypsum osinthidwa mu 0.3% kumawonjezeka ndi 95%, 106%, 97% poyerekeza ndi blank gulu lolamulira. Ma cellulose ether amatha kusintha kusungidwa kwamadzi kwa gypsum slurry. Ndi kuchuluka kwa HPMC zili, kuchuluka kwa madzi posungira madzi a HPMC kusinthidwa gypsum slurry ndi makulidwe osiyana pang'onopang'ono kufika machulukitsidwe mfundo. 10000mPa·sHPMC idafika pamalo okhazikika pa 0.3%, 75000mPa·s ndi 20000mPa·s HPMC idafika pamalo okhazikika pa 0.2%. Zotsatira zikuwonetsa kuti kusungidwa kwamadzi kwa 75000mPa·s HPMC kusinthidwa gypsum kusintha ndi kutentha pansi pa mlingo wosiyana. Ndi kuchepa kwa kutentha, kuchuluka kwa madzi osungira madzi a HPMC kusinthidwa gypsum kumachepa pang'onopang'ono, pamene madzi osungira madzi a gypsum yoyera amakhalabe osasintha, kusonyeza kuti kuwonjezeka kwa kutentha kumachepetsa mphamvu yosungira madzi ya HPMC pa gypsum. Mlingo wosungira madzi wa HPMC unatsika ndi 31.5% pamene kutentha kunakwera kuchoka pa 20 ℃ kufika ku 40 ℃. Kutentha kumakwera kuchoka pa 40 ℃ kufika ku 60 ℃, kuchuluka kwa madzi osungira madzi a HPMC mosinthidwa gypsum kumakhala kofanana ndi gypsum yoyera, kusonyeza kuti HPMC yataya mphamvu yokonza kusungirako madzi kwa gypsum panthawiyi. Jian Jian ndi Wang Peiming anapempha kuti mapadi efa palokha ali ndi chodabwitsa matenthedwe gel osakaniza, kutentha kusintha kudzachititsa kusintha mamasukidwe akayendedwe, morphology ndi adsorption wa mapadi efa, amene ayenera kutsogolera kusintha ntchito kusakaniza slurry. Bulichen adapezanso kuti kukhuthala kwamphamvu kwamayankho a simenti okhala ndi HPMC kunatsika ndikuwonjezeka kwa kutentha.

Kusintha kwa kusunga madzi kwa osakaniza chifukwa cha kuwonjezeka kwa kutentha kuyenera kuphatikizidwa ndi makina a cellulose ether. Bulichen adalongosola njira yomwe cellulose ether imatha kusunga madzi mu simenti. M'makina opangidwa ndi simenti, HPMC imapangitsa kuti madzi asungidwe slurry pochepetsa kutsekemera kwa "keke yosefera" yopangidwa ndi simenti. Ena ndende ya HPMC mu madzi gawo kupanga mazana angapo nanometers kwa ma microns ochepa a colloidal mayanjano, ili ndi buku lina la polima dongosolo akhoza bwino pulagi madzi kufala njira kusakaniza, kuchepetsa permeability wa "sefa keke", kuti akwaniritse kusunga madzi moyenera. Bulichen adawonetsanso kuti HPMCS mu gypsum imawonetsa njira yomweyo. Choncho, phunziro la hydromechanical m'mimba mwake wa mgwirizano wopangidwa ndi HPMC mu madzi gawo akhoza kufotokoza zotsatira za HPMC pa madzi posungira gypsum.

2.3 Hydrodynamic diameter ya HPMC colloid association

Tinthu kugawa zokhotakhota zosiyanasiyana woipa wa 75000mPa·s HPMC mu madzi gawo, ndi tinthu kugawa zokhotakhota atatu specifications HPMC mu madzi gawo pa ndende ya 0,6%. Tingaone kuchokera tinthu kugawa pamapindikira a HPMC atatu specifications mu madzi gawo pamene ndende ndi 0,6% kuti, ndi kuwonjezeka HPMC ndende, ndi tinthu kukula kwa kugwirizana mankhwala anapanga mu madzi gawo komanso kumawonjezera. Pamene ndende ndi otsika, ndi particles opangidwa ndi HPMC aggregation ndi ang'onoang'ono, ndi gawo laling'ono chabe la HPMC akaphatikiza mu particles pafupifupi 100nm. Pamene HPMC ndende ndi 1%, pali ambiri colloidal mayanjano ndi hydrodynamic awiri pafupifupi 300nm, chomwe ndi chizindikiro chofunika kwambiri pamakhala maselo. Izi "chachikulu voliyumu" polymerization dongosolo akhoza bwino kuletsa madzi kufala njira mu Kusakaniza, kuchepetsa "permeability mkate", ndi lolingana madzi posungira gypsum kusakaniza pa ndende imeneyi ndi wamkulu kuposa 90%. Ma diameter a hydromechanical a HPMC okhala ndi ma viscosities osiyanasiyana mu gawo lamadzimadzi amakhala ofanana, omwe amafotokozera kuchuluka kwa kasungidwe kwamadzi kwa HPMC kusinthidwa gypsum slurry ndi ma viscosities osiyanasiyana.

Miyendo yogawa kukula kwa tinthu 75000mPa·s HPMC yokhala ndi 1% pa kutentha kosiyana. Ndi kuwonjezeka kwa kutentha, kuwonongeka kwa HPMC colloidal association kungapezeke mwachiwonekere. Pa 40 ℃, voliyumu yayikulu ya mgwirizano wa 300nm idazimiririka ndikuwola kukhala tinthu tating'ono ta 15nm. Ndi kuwonjezeka kwina kwa kutentha, HPMC imakhala tinthu tating'onoting'ono, ndipo kusungirako madzi kwa gypsum slurry kumatayika kwathunthu.

Chodabwitsa cha katundu HPMC kusintha ndi kuwuka kwa kutentha amadziwikanso monga kutentha gel osakaniza katundu, alipo maganizo wamba kuti pa kutentha otsika, HPMC macromolecules choyamba omwazika m'madzi kupasuka njira, HPMC mamolekyu mu ndende mkulu adzapanga lalikulu tinthu mayanjano. . Kutentha kumawuka, hydration ya HPMC imafooka, madzi pakati pa maunyolo amachotsedwa pang'onopang'ono, magulu akuluakulu a mayanjano amamwazikana pang'onopang'ono m'tinthu tating'onoting'ono, kukhuthala kwa yankho kumachepa, ndipo mawonekedwe atatu amtundu wa maukonde amapangidwa pamene gelation kutentha kumafika, ndipo gel yoyera imayamba.

Bodvik adapeza kuti mawonekedwe a microstructure ndi adsorption a HPMC mu gawo lamadzimadzi adasinthidwa. Kuphatikizidwa ndi chiphunzitso cha Bulichen cha HPMC colloidal association kutsekereza njira yoyendera madzi ya slurry, zidatsimikiziridwa kuti kuwonjezeka kwa kutentha kunayambitsa kupasuka kwa HPMC colloidal association, zomwe zinachititsa kuchepa kwa kusunga madzi kwa gypsum yosinthidwa.

3. Mapeto

(1) Cellulose ether palokha imakhala ndi kukhuthala kwakukulu komanso "superimposed" zotsatira ndi gypsum slurry, kusewera momveka bwino. Pa kutentha kwa firiji, kukhuthala kwake kumakhala koonekera kwambiri ndi kuwonjezeka kwa mamasukidwe akayendedwe ndi mlingo wa cellulose ether. Komabe, ndi kuwonjezeka kwa kutentha, kukhuthala kwa cellulose ether kumachepa, kukhuthala kwake kumafowoka, kumeta ubweya wa zokolola ndi kukhuthala kwa pulasitiki wa gypsum mix mix, pseudoplasticity imafooka, ndipo nyumba yomanga imakula.

(2) Ma cellulose ether adathandizira kusungirako madzi kwa gypsum, koma pakuwonjezeka kwa kutentha, kusungirako madzi kwa gypsum yosinthidwa kunatsikanso kwambiri, ngakhale pa 60 ℃ kudzataya mphamvu yosungira madzi. Mlingo wosungira madzi wa gypsum slurry udasinthidwa kwambiri ndi cellulose ether, ndipo kuchuluka kwa madzi a HPMC kusinthidwa kwa gypsum slurry ndi kukhuthala kosiyana pang'onopang'ono kunafika pakukhutitsidwa ndi kuchuluka kwa mlingo. Kusungidwa kwa madzi a Gypsum nthawi zambiri kumakhala kolingana ndi kukhuthala kwa cellulose ether, kukhuthala kwakukulu kumakhala ndi zotsatira zochepa.

(3) Zinthu zamkati zomwe zimasintha kasungidwe ka madzi a cellulose ether ndi kutentha zimagwirizana kwambiri ndi mawonekedwe a cellulose ether mu gawo lamadzimadzi. Pazigawo zina, cellulose ether imakonda kuphatikizika ndikupanga mayanjano akuluakulu a colloidal, kutsekereza mayendedwe amadzi osakaniza a gypsum kuti asunge madzi ambiri. Komabe, ndi kuwonjezeka kwa kutentha, chifukwa cha matenthedwe a gelation katundu wa cellulose ether palokha, kale anapanga lalikulu colloid mayanjano redisperses, kumabweretsa kuchepa kwa ntchito posungira madzi.