HPMC (hydroxypropyl methylcellulose) ndeye multifunctional polymer additive inoshandiswa zvakanyanya mukuvaka, kunyanya mune simende-based zvinhu. Kuunzwa kweHPMC kunogona kuvandudza zvakanyanya mashandiro esimende-yakavakirwa zvinhu, zvinosanganisira kusimudzira kutsemuka, kuvandudza kushanda uye kudzora hydration maitiro, nekudaro zvinobudirira kuderedza kuitika kwekutsemuka.
Kemikari uye zvemuviri zvimiro zveHPMC
HPMC ndeye semi-synthetic polymer kemikari yakagadziridzwa kubva ku cellulose. Yayo mamorekuru chimiro inosanganisira methyl uye hydroxypropyl inotsiva, ichipa iyo yakasarudzika solubility, thickening, kuchengetwa kwemvura uye firimu-kugadzira zvinhu. Zvikuru zvayo zvinosanganisira:
Kuchengetedzwa kwemvura kwakakwirira: HPMC ine yakanakisa kuchengetedza mvura uye inogona kugadzira firimu rekuchengetedza mvura mukati mechinhu kuti inonoke kubuda kwemvura.
Kukora mhedzisiro: HPMC inogona kuwedzera zvakanyanya viscosity yeiyo slurry, nekudaro ichivandudza kushanda kwayo.
Mafirimu-ekugadzira zvinhu: Yayo yakanaka yekugadzira firimu kugona inogona kuumba inochinjika firimu pamusoro pechinhu, ichipa kumwe kuchengetedzwa kwemuviri.
Iyo pesvedzero meshini yeHPMC pakutsemuka kwesimende-yakavakirwa zvinhu
1. Kuchengetwa kwemvura uye kuderedzwa kwekuoma shrinkage kuputika
Cementitious zvinhu zvinowana yakakura volumetric shrinkage panguva yekuoma, zvakanyanya nekuda kwekurasikirwa kwemvura uye kuomesa shrinkage nekuda kwekuita kwehydration. Kuomesa shrinkage kutsemuka kunowanzo kukonzerwa nekukurumidza kubuda kwemvura mune simenti slurry panguva yekuomeswa kwemaitiro, zvichikonzera kusaenzana kwevhoriyamu shrinkage, zvichikonzera kuputika. Iwo ekuchengetedza mvura zvivakwa zveHPMC anoita basa rakakosha mune izvi:
Inodzikisira kubuda kwemvura: HPMC inochengetedza hunyoro mune simende slurry, nokudaro ichideredza mwero wekubuda kwemvura. Iyi yekuchengeta mvura haingobatsiri chete kurebesa iyo hydration reaction nguva, asi zvakare inoderedza kuomesa shrinkage kunokonzerwa nekubuda kwemvura.
Uniform hydration reaction: Sezvo HPMC ichipa nzvimbo yakagadzikana yemvura, zvimedu zvesimende zvinogona kupinda mune imwe yunifomu uye yakakwana hydration reaction, kuderedza kushushikana kwemukati misiyano uye kuderedza njodzi yekutsemuka kunokonzerwa nekuoma shrinkage.
2. Kuvandudza viscosity uye kugovera kufanana kwezvinhu
HPMC ine kukora mhedzisiro, iyo inoita basa rakakosha mukuvandudza kushanda uye kufanana kwesimende-yakavakirwa zvinhu:
Kuwedzera Viscosity: HPMC inowedzera viscosity ye slurry, inovandudza kushanda panguva yekushandiswa, ichibvumira slurry kuyerera zvirinani uye kuzadza mold kana kuputika, kuderedza voids uye nzvimbo dzisina kuenzana.
Kugovera kwakafanana: Nekuwedzera viscosity ye slurry, HPMC inoita kuti kugoverwa kwemafirita uye mafibhi mu slurry zvakanyanya kunyange, zvichikonzera yunifomu yemukati chimiro panguva yekuomeswa kwemaitiro uye kuderedza kutsemuka nekuda kwenzvimbo yakatarisana yekushushikana.
3. Kuvandudza maitiro ekugadzira mafirimu uye kuchengetedzwa kwepamusoro
Iyo firimu-inogadzira zvimiro zveHPMC inobatsira kugadzira chidziviriro chepamusoro pamusoro pechinhu, icho chine mhedzisiro yakanaka mukudzikisa kutsemuka kwepasi:
Kudzivirirwa kwepamusoro: Iyo inochinjika firimu layer yakaumbwa neHPMC pamusoro peiyo zvinhu inogona kudzivirira pamusoro kubva mukukukurwa nekunze kwezvakatipoteredza uye nekukasira kurasikirwa nehunyoro, nekudaro kuderedza kuitika kwekutsemuka kwepasi.
Flexible coverage: Iyi firimu layer ine imwe nhanho yekuchinjika uye inogona kutora chikamu chekushushikana panguva yekushomeka kushoma, nekudaro kudzivirira kana kudzikisa pasi kuwedzera kwekutsemuka.
4. Rongedza hydration process
HPMC inogona kudzora iyo hydration process ye simenti, iyo inoita basa rakakosha mukuderedza kushushikana kunokonzerwa nekusaenzana hydration:
Slow-release hydration: HPMC inogona kuderedza kukurumidza hydration reaction, ichibvumira mvura iri mu simenti slurry kuti isunungurwe zvishoma nezvishoma, nokudaro ichipa imwe yunifomu uye inochengetedza hydration nharaunda. Izvi zvinononoka-kuburitsa mhedzisiro inoderedza kushushikana kunokonzerwa nekusaenzana hydration maitiro, nekudaro kuderedza njodzi yekutsemuka.
Mienzaniso yekushandisa yeHPMC mune dzakasiyana-siyana-simende-yakavakirwa zvinhu
HPMC inoshandiswa zvakanyanya musimende-yakavakirwa zvinhu, zvinosanganisira asi kwete kuganhurirwa kuzvikwiriso pasi, ekunze madziro machira, madhaka uye kongiri kugadzirisa zvinhu. Iyi inotevera mimwe mienzaniso chaiyo yekushandisa:
1. Kuzvigadzika pasi zvinhu
Kuzvimisa-leveling pasi zvinhu zvinoda mvura yakanaka uye yekubatanidza zvivakwa uchidzivirira kutsemuka kwepamusoro. HPMC inonatsiridza kuyerera uye kupedzwa kwepamusoro kwechinhu kuburikidza nekukora uye kuchengetedza kwemvura mhedzisiro uku ichideredza kuitika kwekutsemuka kwepasi.
2. Kunze kwemadziro pendi
Pendi yekunze inoda kunamatira kwakanaka uye kuramba kutsemuka. Iyo firimu-inogadzira zvimiro uye kuchengetwa kwemvura kweHPMC inovandudza kunamatira uye kuchinjika kwejasi, nekudaro ichiwedzera kupotera kwekupokana uye mamiriro ekunze.
3. Kugadzirisa zvinhu
Concrete kugadzirisa zvinhu zvinoda simba rakakwirira uye kukurumidza kuoma paunenge uchichengetedza kuoma kwakaderera shrinkage. HPMC inopa yakanakisa kuchengetedza kwemvura uye hydration yekudzora masimba, ichibvumira iyo yekugadzirisa zvinhu kuchengetedza yakaderera yakaoma shrinkage panguva yekuomeswa kwemaitiro uye kuderedza njodzi yekupwanya mushure mekugadzirisa.
Kungwarira pakushandisa HPMC
Kunyangwe HPMC iine mhedzisiro yakakosha mukudzikisa kutsemuka kwesimende-yakavakirwa zvinhu, zvinotevera mapoinzi achiri kuda kucherechedzwa panguva yekushandiswa:
Dosage control: Iyo dosage yeHPMC inofanirwa kunyatsoenderana nezvinodiwa fomula. Zvakawanda kana zvishoma zvinokanganisa maitiro echinhu. Kazhinji kutaura, iyo dosage iri pakati pe0.1% - 0.5%.
Kusanganisa Uniformity: HPMC inoda kunyatsosanganiswa nezvimwe zvinhu kuti ive nechokwadi chekuti inoshanda mukati mese slurry.
Mamiriro ekuvaka: Mamiriro ekuvaka (senge tembiricha, humidity) zvakare ane chekuita nemhedzisiro yeHPMC, uye inofanirwa kugadziridzwa zvinoenderana nemamiriro chaiwo.
Senge inobudirira simende-yakavakirwa zvinhu zvekuwedzera, HPMC inoita basa rakakosha mukudzikisa kutsemuka kwesimende-yakavakirwa zvinhu kuburikidza neyakasiyana yekuchengetedza mvura, kukora, firimu-kuumba uye hydration control zvivakwa. Inononoka kubuda kwemvura, inovandudza kufanana kwezvinhu, inodzivirira zvinhu, uye inogadzirisa hydration process, nekudaro ichideredza zvakanyanya njodzi yekupwanya. Naizvozvo, mukushandiswa kwesimende-yakavakirwa zvinhu, kushandisa zvine musoro kweHPMC hakungogone kuvandudza mashandiro ezvinhu, asiwo kuwedzera hupenyu hwayo hwebasa uye kuderedza mari yekugadzirisa.
Nguva yekutumira: Jun-26-2024