HPMC mu pulasitala wa gypsum

Hydroxypropyl Methylcellulose (HPMC)ndi ether ya cellulose yosakhala ionic, yomwe imagwiritsidwa ntchito kwambiri popanga zipangizo zomangira, makamaka mu matope osakaniza ouma, guluu wa matailosi, ufa wa putty ndi zinthu zopangidwa ndi gypsum.

1. Chidule cha pulasitala wa gypsum

Pulasitiki ya gypsum ndi chinthu chomangira khoma chomwe chimapangidwa ndi gypsum ngati simenti, chomwe chili ndi ubwino womanga mosavuta, kuumitsa mwachangu komanso kusamala chilengedwe. Malinga ndi chiŵerengero cha zowonjezera zosiyanasiyana, zinthu zomwe zili ndi makhalidwe osiyanasiyana monga kupaka pulasitiki pamanja, kupopera gypsum ndi gypsum yodziyimira payokha zimatha kukonzedwa. Ngakhale kuti pulasitiki ya gypsum mwachibadwa imakhala yolimba komanso yolimba, imakhalabe ndi mavuto monga kusasunga madzi bwino, kusweka mosavuta komanso kumanga koyipa panthawi yomanga, kotero ndikofunikira kuwonjezera zinthu zoyenera kuti ziwongolere magwiridwe ake antchito.

2. Njira yogwirira ntchito ya HPMC

Popeza ndi polima yosungunuka m'madzi yothandiza kwambiri, HPMC imapangitsa kuti pulasitala wa gypsum ugwire bwino ntchito kudzera m'mbali zotsatirazi:

2.1. Kusunga bwino madzi:

HPMC ili ndi mphamvu yabwino yosungira madzi ndipo imatha kuchepetsa kwambiri kutayika kwa madzi a gypsum panthawi yomanga. Mbali imeneyi ndi yofunika kwambiri pakuwonjezera nthawi yoyambira yoyika gypsum ndikukweza nthawi yogwirira ntchito yomanga, makamaka pa kutentha kwambiri kapena zigawo zoyambira zomwe zimayamwa madzi ambiri, zomwe zingapewe ming'alu ndi kuchepa kwa kumamatira.

2.2. Kapangidwe kabwino ndi kagwiritsidwe ntchito:

HPMC imatha kuwonjezera kukhazikika ndi kukhuthala kwa matope, kupangitsa kuti pulasitala ya gypsum ikhale yosalala panthawi yopaka pulasitala ndi kulinganiza khoma, kuchepetsa kukana kwa zida ndikuwonjezera magwiridwe antchito omanga. Pa gypsum yopopedwa ndi makina, HPMC ndi chida chofunikira kwambiri chowongolera rheology.

2.3. Kugwira ntchito bwino koletsa kugwa:

Pakumanga khoma lokhuthala kapena loyima, kuwonjezera HPMC kungathandize kwambiri kuti pulasitala isagwedezeke, zomwe zimathandiza kuti ikhale yolimba komanso kuti isagwedezeke mosavuta.

2.4. Kukhazikika kwa thovu ndi kufalikira kofanana:

Thovu laling'ono limapangidwa mosavuta panthawi yosakaniza. HPMC imatha kulimbitsa thovu izi, zomwe zimathandiza kuchepetsa kuchuluka kwa pulasitala ndikuwonjezera mphamvu yoteteza kutentha, koma sizikhudza mphamvu zake zamagetsi.

2.5. Kugwirizana kowonjezereka:

HPMC imatha kupanga kapangidwe ka filimu yosinthasintha pakati pa gypsum ndi substrate, motero imapangitsa kuti mgwirizano ugwire bwino ntchito komanso kuchepetsa mavuto abwino monga kusweka ndi kuchotsedwa kwa zipolopolo.

3. Malangizo a kagwiritsidwe ntchito ka HPMC ndi mlingo

HPMC nthawi zambiri imawonjezeredwa ku gypsum dry mix mu mawonekedwe a ufa ndikusakanikirana kwathunthu ndi zinthu zina (monga aggregate yopepuka, mchenga wa quartz, retarder, ndi zina zotero) kudzera mu njira yosakaniza youma. Mlingo wake nthawi zambiri umayendetsedwa pa 0.1% ~ 0.3% (kutengera zinthu zouma), ndipo chiŵerengero chenichenicho chiyenera kukonzedwa bwino ndikusinthidwa malinga ndi zinthu monga njira yopangira zinthu, njira yomangira ndi nyengo.

Popopera gypsum, kuti pakhale kusalala ndi kupopera bwino kwa kapangidwe kake, HPMC yokhala ndi digiri yapamwamba yosinthira komanso kukhuthala koyenera (monga 50,000100,000 mPa.s) ikhoza kusankhidwa, pomwe mu gypsum yopangidwa ndi pulasitiki pamanja, mitundu ya kukhuthala kwapakati (20,00060,000 mPa.s) ingasankhidwe kuti iganizire momwe kapangidwe kake kamvekere komanso momwe kamaletsera kutsika.

4. Machenjezo ndi zovuta

Ngakhale kuti HPMC yabweretsa zabwino zambiri pa gypsum plaster, mfundo zotsatirazi ziyenera kukumbukiridwa popanga ndi kugwiritsa ntchito njira zopangira:

Kufalikira kofanana: HPMC iyenera kufalikira mokwanira kuti isakumane, ndipo kufalikira kwake kungawongoleredwe mwa kusakaniza mouma kapena kusungunuka musanasungunuke.

Kugwirizana ndi zowonjezera zina: HPMC iyenera kugwira ntchito mogwirizana ndi zinthu zochepetsera madzi, zinthu zochepetsera madzi, zinthu zokulitsa, ndi zina zotero kuti ipewe zotsatirapo zoyipa.

Kusankha koyenera kwa kukhuthala: kukhuthala kwakukulu sikukwera, koma kumakhala bwino. Kukhuthala kwakukulu kungayambitse mavuto osakanikirana, kusayenda bwino kwa madzi, komanso kusokoneza magwiridwe antchito a kupopa.

Ndi chitukuko cha zipangizo zomangira zobiriwira komanso kufalikira kwa zomangamanga zopangidwa ndi makina, zofunikira pakugwira ntchito kwa pulasitala wa gypsum zikuwonjezekanso. HPMC ipitiliza kuchita gawo lofunika kwambiri pakulamulira magwiridwe antchito omanga ndikukweza kukhazikika kwa khalidwe. Nthawi yomweyo, zinthu zosinthidwa zambiri za cellulose ether zidzagwiritsidwa ntchito limodzi ndiHPMCkukwaniritsa zofunikira zinazake zogwirira ntchito, monga HPMC/HEMC compounding system ndi multifunctionalufa wa latex wosungunukansonjira yosakanikirana, kuthandiza zinthu za gypsum kukula kuti zikhale ndi magwiridwe antchito apamwamba komanso magwiridwe antchito ambiri.