hydroxypropyl methylcellulose (HPMC) mu pulasitala wopepuka wochokera ku gypsum

Pulasitiki yopepuka yopangidwa ndi gypsum ndi zinthu zomangira zosawononga chilengedwe zomwe zimagwiritsidwa ntchito kwambiri pomanga makoma, makina otetezera kutentha komanso kukonza maziko okongoletsera. Imapangidwa ndi gypsum yomangira ngati chinthu chachikulu chomangira simenti, chowonjezeredwa ndi zinthu zopepuka (monga perlite, vitrified microspheres, mipira ya thovu, ndi zina zotero). Chifukwa cha makhalidwe a gypsum yokha, monga kuuma mwachangu ndi liwiro lolimba, kuchepa kwakukulu, komanso kusaphwanyika mosavuta, kuti iwonjezere magwiridwe antchito ake omangira ndikugwiritsa ntchito bwino, nthawi zambiri pamafunika kuwonjezera zowonjezera zosiyanasiyana kuti ziwongolere magwiridwe antchito ake. Pakati pawo,hydroxypropyl methylcellulose (HPMC), monga ether yofunika kwambiri yogwira ntchito ya cellulose, imagwira ntchito yofunika kwambiri pa pulasitala yopepuka yopangidwa ndi gypsum.

1. Makhalidwe oyambira a HPMC

HPMC ndi polima yosasungunuka m'madzi yomwe imapangidwa ndi kusintha kwa etherification kwa cellulose yachilengedwe yokhala ndi mamolekyulu ambiri. Ili ndi mphamvu yabwino yosunga madzi, kukhuthala, kukhuthala, kupanga filimu komanso kuyimitsidwa. Nthawi zambiri imawonjezedwa ngati ufa ku pulasitala, matope ndi zipangizo zina zomangira zouma, ndipo imatupa ndikusungunuka mwachangu ikakhudzana ndi madzi kuti igwire ntchito.

2. Ntchito yaikulu ya HPMC mu pulasitala wopepuka wochokera ku gypsum

2.1. Limbikitsani kusunga madzi ndikuwonjezera nthawi yogwirira ntchito

Gypsum imakhala ndi nthawi yochepa yoyambira kuyika madzi komanso imayamwa madzi mwamphamvu, ndipo imatha kutaya madzi mwachangu panthawi yomanga, zomwe zimapangitsa kuti pakhale mavuto monga kusweka ndi ufa. HPMC ili ndi madzi abwino kwambiri ndipo imatha kupanga filimu yamadzi yofanana mu matope, kuchepetsa kulowa kwa madzi omasuka mu substrate, ndikuchedwetsa kusungunuka kwa madzi, motero:

Onetsetsani kuti gypsum ili ndi madzi okwanira komanso kuti zinthuzo zikhale zolimba;

Kuchepetsa ming'alu yocheperako ndikuwongolera ubwino wowonekera;

Wonjezerani nthawi yogwirira ntchito yomanga, onjezerani magwiridwe antchito komanso kusinthasintha kwa ntchito yomanga, makamaka m'malo otentha kwambiri komanso ouma.

2.2. Kuwongolera kapangidwe ndi magwiridwe antchito

HPMC imatha kusintha kwambiri kusinthasintha ndi kuchuluka kwa pulasitala ya gypsum, zomwe zimapangitsa kuti matope ake azikhala ofewa komanso onyowa. Makamaka zimawonetsedwa mu:

Zosavuta kusakaniza ndi kugwiritsa ntchito, zosavuta kugwiritsa ntchito;

Chepetsani kutsetsereka ndi kupangika kwa ufa wa zinthu;

Onetsetsani kuti pulasitala pakhoma ndi yofanana ndipo onjezerani kuti pamwamba pake pakhale posalala.

2.3. Kulimbitsa mphamvu zomatira komanso zoletsa kugwa

HPMC imatha kupanga filimu yabwino yothira madzi pakati pa matope ndi substrate, kukonza kugwirizana pakati pa pulasitala ndi khoma, motero ingathandize:

Kuchepetsa mavuto obowoka ndi kugwa;

Wonjezerani luso loletsa kugwa kwa nthaka pomanga pamwamba moyimirira, zomwe zimapangitsa kuti zinthuzo zisagwere pansi, zomwe zimathandiza kuti pakhale kumangidwa kwa zigawo zokhuthala;

Thandizani kupanga gawo lomaliza losalala komanso lolimba.

2.4. Sinthani kusinthasintha ndi kukhuthala kwa mphamvu

HPMC ili ndi mphamvu yabwino yowongolera kukhuthala kwa yankho. Ikasungunuka m'madzi, imapanga dongosolo la viscoelastic colloid, lomwe limakhazikitsa gypsum slurry yonse, limaletsa kugawikana ndi kugawa, komanso limawongolera kukhazikika kwa voliyumu ya zinthuzo. Nthawi yomweyo, malinga ndi kuchuluka kwa kukhuthala ndi kuchuluka kwa mitundu yosiyanasiyana ya HPMC, ogwiritsa ntchito amatha kusintha kusinthasintha kwa pulasitala kuti igwirizane ndi njira zosiyanasiyana zomangira (monga kupaka pulasitala ndi manja ndi kupopera makina).

2.5. Kulimbitsa kukana ming'alu pambuyo pomanga

Pulasitiki yopepuka yopangidwa ndi gypsum imakonda kusweka chifukwa cha kupepuka kwake komanso kufupika kwakukulu. HPMC imatha kuchepetsa kupsinjika ndi ming'alu mwa kuwonjezera kusunga madzi, kukhazikika pang'onopang'ono komanso kusinthasintha. Kuphatikiza apo, HPMC imathanso kukulitsa kukana kwa plasitiki kusintha, ndikupangitsa kuti ikhale yoyenera kwambiri m'malo osiyanasiyana oyambira.

3. Malangizo Ogwiritsira Ntchito HPMC

Njira Yowonjezerera: HPMC nthawi zambiri imasakanizidwa ndi ufa wina ngati chinthu chosakaniza chouma pasadakhale. Sikoyenera kuiyika mwachindunji m'madzi ndikuyisakaniza kuti isagwirizane.

Kuwongolera Mlingo: Kuwonjezera kwambiri kungayambitse nthawi yochuluka yotseka, kuchepa kwa mphamvu, komanso kuchepa kwa kumamatira. Kuchuluka koyenera kowonjezera ndi 0.1% ~ 0.5%.

Kusankha chitsanzo: HPMC yokhala ndi kukhuthala kosiyana ndi madigiri osinthira iyenera kusankhidwa malinga ndi kapangidwe ka chinthucho kuti iganizire momwe chimagwirira ntchito komanso momwe chimagwirira ntchito.

4. Kufunika kwa HPMC pakulimbikitsa zipangizo zomangira zobiriwira

Malinga ndi zomwe zikuchitika panopa polimbikitsa kusungira mphamvu komanso kumanga nyumba zosamalira chilengedwe, pulasitala wopepuka wochokera ku gypsum ukugwiritsidwa ntchito kwambiri m'nyumba zobiriwira chifukwa cha ubwino wake wa zinthu zongowonjezedwanso, mpweya wochepa wa carbon, komanso chitonthozo chabwino. HPMC, monga chowonjezera chofunikira kwambiri pakupanga pulasitala wa gypsum, sikuti imangowonjezera magwiridwe antchito ake, komanso imawonjezera kugwiritsa ntchito bwino ntchito yomanga komanso kuchuluka kwa zinthu zomwe zimagwiritsidwa ntchito, imachepetsa kutaya kwa zinthu zomwe zimachitika chifukwa chokonzanso, ndipo ndi chinthu chofunikira kwambiri cholimbikitsira chitukuko chokhazikika cha zipangizo zobiriwira.

Hydroxypropyl methylcellulose (HPMC) imagwira ntchito zosiyanasiyana mu pulasitala wopepuka wochokera ku gypsum, kuphatikizapo kusunga madzi, kukhuthala, mafuta odzola, kuletsa kugwa ndi kulimbitsa mgwirizano, zomwe zimapangitsa kuti plaster ya gypsum ikhale yogwira ntchito bwino, komanso kuti ikhale ndi moyo wautali. Chifukwa cha kuchuluka kwa kufunika kwa zipangizo zopepuka, zosunga mphamvu komanso zosawononga chilengedwe m'makampani omanga, kufunika kwa HPMC m'makina opangidwa ndi gypsum kudzaonekera kwambiri, ndipo kufunika kwake kwaukadaulo ndi malo ogwiritsira ntchito pamsika zidzapitirira kukula. Kusankha ndi kugwiritsa ntchito bwino HPMC kudzapereka maziko olimba owongolera magwiridwe antchito a makina opangidwa ndi gypsum ndikuwonetsetsa kuti ntchito zomanga ndizabwino.