Hydroxypropyl Methyl Cellulose (HPMC)inokosha cellulose ether, iyo inoshandiswa zvakanyanya mukuvaka zvinhu, kunyanya mudhaka semvura inochengetedza uye thickener. Iyo yekuchengeta mvura mhedzisiro yeHPMC mudhaka inokanganisa zvakananga kuita kwekuvaka, kusimba, kukura kwesimba uye kuramba kwemamiriro ekunze kwedhaka, saka kushandiswa kwayo kunoita basa rakakosha mumhando yezvirongwa zvekuvaka.
1. Mvura yekuchengeta zvinodiwa uye zvinokanganisa mudhaka
Doka chinhu chinowanzo shandiswa pakunamira mumapurojekiti ekuvaka, anonyanya kushandiswa pakugadzira masonry, plastering, kugadzirisa, nezvimwe. Panguva yekuvaka, dhaka rinofanira kuchengetedza huwandu hwemwando kuti ive nechokwadi chekushanda kwakanaka uye kunamatira. Kukurumidza kubuda kwemvura mudhaka kana kurasikirwa kwakanyanya kwemvura kunotungamira kune anotevera matambudziko:
Kudzikira simba: Kurasika kwemvura kunokonzeresa kusakwana simende hydration reaction, nekudaro kukanganisa kukura kwesimba kwedhaka.
Kusakwana kusungirirwa: Kurasikirwa kwemvura kuchaita kuti kusakwana kusungirirwa pakati pevhu uye substrate, kunokanganisa kugadzikana kwechivakwa chekuvaka.
Dry cracking uye gollowing: Kusaenzana kugovera kwemvura kunogona kukonzera shrinkage uye kuputika kwedhaka revhu, zvichikanganisa chitarisiko uye hupenyu hwebasa.
Nokudaro, dhaka rinoda simba rakasimba rekuchengetedza mvura panguva yekuvaka nekugadzirisa, uye HPMC inogona kuvandudza zvakanyanya kuchengetwa kwemvura yedhaka, kuvandudza kushanda kwekuvaka uye kunaka kwechigadzirwa chakapedzwa.
2. Mvura yekuchengetedza nzira yeHPMC
HPMC ine kuchengetedzeka kwemvura kwakasimba zvakanyanya, zvakanyanya nekuda kwechimiro chayo chemorekuru uye yakakosha kuita maitiro mudhaka:
Kunyura kwemvura uye kuwedzera: Kune akawanda hydroxyl mapoka mune mamorekuru chimiro cheHPMC, anogona kuumba hydrogen zvisungo nemamorekuru emvura, zvichiita kuti inyure zvakanyanya mvura. Mushure mekuwedzera mvura, mamorekuru eHPMC anogona kutora huwandu hwemvura uye kuwedzera kuita yunifomu gel layer, nekudaro kunonoka kubuda uye kurasikirwa kwemvura.
Maumbirwo emufirimu: HPMC inonyungudika mumvura kuti iite yakakwira-viscosity mhinduro, iyo inogona kugadzira firimu rinodzivirira rakatenderedza zvimedu zvedhaka. Iyi firimu inodzivirira haigone kuvhara munyoro chete, asi zvakare kuderedza kutama kwehunyoro kune substrate, nokudaro kuvandudza kuchengetwa kwemvura kwedhaka.
Kukora mhedzisiro: Mushure mekunge HPMC yanyungudika mumvura, inowedzera viscosity yedhaka, iyo inobatsira kugovera zvakaenzana uye kuchengetedza mvura uye kudzivirira mvura kubva pakudonha kana kurasikirwa nekukurumidza. Iko kukora mhedzisiro inogona zvakare kuvandudza kushanda kwedhaka uye kunatsiridza mashandiro ayo anti-sagging.
3. HPMC kuchengetedza mvura inovandudza kushanda kwedhaka
HPMC inovandudza kuchengetwa kwemvura kwedhaka, iyo isina kunanga ine mhedzisiro yakanaka pane yayo yemuviri uye kemikari. Inonyatso kuratidzwa muzvikamu zvinotevera:
3.1 Kuvandudza kushanda kwedhaka
Kushanda kwakanaka kunogona kuvimbisa kutsetseka kwekuvaka. HPMC inowedzera viscosity uye kuchengetwa kwemvura kwedhaka, kuitira kuti dhaka rirambe rakanyorova panguva yekuvaka, uye hazvisi nyore stratify uye precipitate mvura, nokudaro kuvandudza zvikuru operability yekuvaka.
3.2 Wedzera nguva yakazaruka
Kuvandudzwa kwekuchengetedza mvura kweHPMC kunogona kuchengetedza dhaka rakanyorova kwenguva yakareba, kurebesa nguva yakavhurika, uye kuderedza chiitiko chekuoma kwedhaka nekuda kwekukurumidza kurasikirwa kwemvura panguva yekuvaka. Izvi zvinopa vashandi vekuvaka nguva yakareba yekugadzirisa uye zvinobatsira kuvandudza kunaka kwekuvaka.
3.3 Wedzera kusimba kwechisungo chedhaka
Kusimba kwechisungo chedhaka kunoenderana zvakanyanya neiyo hydration reaction ye simenti. Kuchengetedzwa kwemvura kunopiwa neHPMC kunovimbisa kuti masimende anogona kuve akazara mvura, kudzivirira kusakwana kusungirirwa kunokonzerwa nekurasikirwa kwemvura kwekutanga, nekudaro zvinobudirira kuvandudza kusimba kwechisungo pakati pedhaka uye substrate.
3.4 Deredza kupera nekutsemuka
HPMC ine yakanakisa kuchengetedza kwemvura kuita, iyo inogona kuderedza zvakanyanya kukurumidza kurasikirwa kwemvura, nekudaro ichidzivirira shrinkage uye shrinkage kuputika kunokonzerwa nekurasikirwa kwemvura panguva yekugadzika kwedhaka, nekuvandudza kutaridzika uye kusimba kwedhaka.
3.5 Wedzera kuomesa-kunyungudika kwedhaka
Kuchengetwa kwemvura kweHPMCinoita kuti mvura iri mudhaka igoverwe zvakaenzana, iyo inobatsira kuvandudza kuwanda uye kufanana kwedhaka. Ichi chimiro chakafanana chinogona kuramba zvirinani kukuvadzwa kunokonzerwa nechando-thaw kutenderera munzvimbo dzinotonhora uye kugadzirisa kusimba kwedhaka.
4. Ukama pakati pehuwandu hweHPMC uye mhedzisiro yekuchengeta mvura
Huwandu hweHPMC hwakawedzerwa hwakakosha pakuchengetedza mvura kwedhaka. Kazhinji, kuwedzera huwandu hwakakodzera hweHPMC kunogona kuvandudza zvakanyanya kuchengetwa kwemvura kwedhaka, asi kana yakawandisa yawedzerwa, inogona kuita kuti dhaka risave viscous, zvichikanganisa kushanda kwekuvaka uye simba mushure mekuoma. Naizvozvo, mumashandisirwo anoshanda, huwandu hweHPMC hunoda kudzorwa zvine mutsindo zvichienderana neforoma chaiyo uye zvinodiwa zvekuvaka zvedhaka kuti uwane yakanakisa kuchengetedza mvura.
Sechinhu chakakosha chekuchengetedza mvura uye mukobvu, HPMC inoita basa risingadzokerike mukuvandudza kuchengetwa kwemvura kwedhaka. Iyo haingogone chete kuvandudza zvakanyanya kushanda uye kuvaka kuita kwedhaka, asi zvakare zvinobudirira kurebesa nguva yakavhurika, kuwedzera simba rekubatanidza, kuderedza shrinkage kuparuka, uye kugadzirisa kusimba uye nechando-kunyunguduka kuramba kwedhaka. Mukuvaka kwemazuva ano, kushandiswa kwakanaka kweHPMC hakugone chete kugadzirisa dambudziko rekurasikirwa kwemvura yematope, asiwo kuvimbisa kunaka kweprojekti uye kuwedzera hupenyu hwebasa rechivako.
Nguva yekutumira: Nov-12-2024