Hydroxypropyl Methylcellulose (HPMC)chinhu chakakosha cellulose ether komboni inoshandiswa zvakanyanya mukuvaka zvinhu, kunyanya mune simende-based mortars, gypsum-based materials uye coatings. HPMC inoita basa rakakosha mukuvandudza zvimiro zvedhaka, kusanganisira kuvandudza maitiro ekudzivirira mvura.
1. Kuvandudza kuchengetwa kwemvura kwedhaka
Chimwe chezvinhu zvinonyanya kukosha zveHPMC ndeyekugona kwayo kuchengetedza mvura. Kuwedzera HPMC kudhaka kunogona kuderedza zvakanyanya mwero wekurasikirwa kwemvura mudhaka. Iyo chaiyo performance ndeye:
Wedzera iyo simende hydration reaction time: HPMC inogona kuchengetedza humidity yakakodzera mukati medhaka uye ive nechokwadi chekuti masimende masimende anonyatsoita nemvura kuti agadzire denser hydration chigadzirwa.
Inodzivirira kuumbwa kwekutsemuka: Kukurumidza kurasikirwa kwemvura kunogona kuita kuti dhaka rideredze uye ritange micro-cracks, nokudaro kuderedza kudzivirira kwemvura.HPMCinogona kuderedza chiyero chekurasikirwa kwemvura uye kuderedza kutsemuka kunokonzerwa nekuoma kwakaoma.
Iko kuvandudzwa kwekuita kwekuchengetedza mvura kunoita kuti chimiro chemukati chedhaka denser, chinoderedza porosity, uye zvakanyanya kunatsiridza kusamira kwedhaka, nekudaro kunowedzera kushanda kwayo kwemvura.
2. Kuvandudza kushanda kwedhaka
Iyo viscosity maitiro eHPMC anovandudza rheological zvimiro zvedhaka, nekudaro zvichivandudza kushanda kwayo:
Deredza kubuda ropa: HPMC inogona kuparadzira mvura zvakaenzana, ichibvumira mvura kuti igoverwe zvakadzikama mudhaka uye kuderedza maburi anokonzerwa nekuparadzaniswa kwemvura.
Kuvandudza kunamatira kwedhaka: HPMC inonatsiridza simba rekubatanidza pakati pedhaka uye chigadziko, ichibvumira dhaka kuti rivhare pamusoro peiyo base zvinhu zvakanyanya padyo, nekudaro ichideredza mukana wekunyorova kunopinda kuburikidza nemukaha pakati pechigadziko uye dhaka. .
Kuvandudzwa kwehutano hwekuvaka kunobata zvakananga kushandiswa kwemvura yevhu. Unifomu uye dense dhaka rinovhara layer rinogona kudzivirira hunyoro kupindira.
3. Gadzira firimu rinodzivirira pamusoro
HPMC ine zvimiro zvekugadzira firimu uye inogona kuumba firimu rakatetepa uye rakaomarara rekudzivirira pamusoro pedhaka:
Deredza huwandu hwekubuda kwemvura: Mushure mekuvakwa kwapera, HPMC ichagadzira firimu rekudzivirira pamusoro pevhu kudzikisa kusvetwa kwehunyoro mukati medhaka nekunze kwezvakatipoteredza.
Vhara kupinza kwemvura: Iyo HPMC layer mushure mekuumbwa kwefirimu ine imwe dhigirii rekudzivirira mvura uye inogona kushandiswa sechivharo kudzivirira hunyoro hwekunze kupinda mukati medhaka.
Kudzivirirwa kwepamusoro uku kunopa kumwe kuchengetedzwa kwekudzivirira kwemvura kwedhaka.
4. Deredza porosity yedhaka
HPMC inogona kunyatso kuvandudza iyo microstructure yedhaka. Maitiro ayo ekuita ndeaya:
Kuzadza mhedzisiro: HPMC mamorekuru anogona kupinda mukati meiyo microporous chimiro mudhaka uye zvishoma kuzadza pores, nekudaro ichidzikisa hunyoro nzira.
Kuvandudza kusimba kwezvigadzirwa zve hydration: Kuburikidza nekuchengetedza mvura, HPMC inovandudza kufanana uye kusimba kwezvigadzirwa zvesimende hydration uye inoderedza huwandu hwemapores makuru mudhaka.
Kuderedzwa kwevhu porosity hakungonatsiridza mashandiro ekudzivirira mvura, asiwo kunovandudza kusimba kwedhaka.
5. Kuvandudza kudzivirira kwechando uye kusimba
Kupinda kwemvura kuchaita kuti dhaka rikanganiswe nekuda kwechando chiri mumhepo yakaderera tembiricha. Iyo yekudzivirira mvura yeHPMC inogona kuderedza kupinda kwemvura uye kuderedza kukuvadzwa kwedhaka kunokonzerwa nechando-thaw kutenderera:
Dzivirira kuchengetwa kwemwando: Deredza kuchengetedzeka kwemwando mukati medhaka uye kuderedza chando chemhepo.
Hupenyu hwakawedzerwa hwematope: Nekudzikisa kurwiswa kwemvura uye kukuvara kwechando, HPMC inowedzera kusimba kwenguva refu kwedhaka.
HPMC inovandudza kushanda kwemvura yedhaka kuburikidza nezvinhu zvinotevera: kuvandudza kuchengetedza kwemvura, kugadzirisa kushanda, kuumba firimu rekudzivirira, kuderedza porosity nekuvandudza chando chekudzivirira. Iyo synergistic mhedzisiro yezvivakwa izvi inoita kuti dhaka riratidze zvirinani kudzivirira mvura mukushandisa zvinoshanda. Ingave mumadhaka ekuvharisa mvura, madhiri ekuzvimisikidza kana anonamira ematairi,HPMCinoita basa rinokosha.
Mumashandisirwo anoshanda, huwandu hweHPMC hwakawedzerwa hunoda kugadziridzwa zvinoenderana nezvinodiwa chaizvo kuti ive nechokwadi chekuti haingoite yakanakisa yekudzivirira mvura, asi zvakare kuchengetedza chiyero chezvimwe zviratidzo zvekuita zvedhaka. Kuburikidza nekushandisa zvine musoro kweHPMC, kuita kwekusapinda mvura kwezvinhu zvekuvaka kunogona kuvandudzwa zvakanyanya uye kuchengetedzwa kwakavimbika kunogona kupihwa kumapurojekiti ekuvaka.
Nguva yekutumira: Nov-23-2024