Hydroxypropyl methylcellulose (HPMC) musanganiswa wepolymer unowanzo shandiswa mukuvaka, kunyanya mugypsum yakatarisana nepurasita, uko inoita basa rakakosha. Sekuwedzera, HPMC inogona kunyatso kuvandudza kushanda kwekushanda, kuchengetedza mvura uye kunamatira kwegypsum yakatarisana nepurasita, saka inoshandiswa zvakanyanya mukuvaka nekushongedza.
1. Basic maitiro eHPMC
HPMC is a non-ionic cellulose ether ine mvura yakanaka solubility uye thickening zvivakwa. Inogona kunyungudika nekukurumidza mumvura kuita yunifomu colloidal fluid, uye ine yakanaka adhesion, lubricity, film-forming uye kuchengetedza mvura. Aya maitiro anoita kuti HPMC ishandiswe zvakanyanya mukuvaka zvinhu, kunyanya yakakodzera kushandiswa mune gypsum-based materials.
Hunhu hukuru hweHPMC hunosanganisira zvinotevera zvinhu:
Kuchengetwa kwemvura: HPMC inogona kuchengetedza hunyoro mugypsum yakatarisana nepurasita, nekudaro ichiwedzera nguva yakavhurika uye nguva yekushanda yechinhu.
Kukora: Semukobvu, HPMC inogona kuwedzera viscosity yepurasita, kudzivirira sagging, uye kunatsiridza brushability.
Lubricity: Iyo yekuzora zvivakwa zveHPMC inovandudza kubata kwekunzwa kwepurasita uye kuita kuti kuvaka kuve nyore.
Firimu-yekugadzira pfuma: Inogona kuumba firimu rekudzivirira pamusoro pepurasita, ichivandudza kutsemuka kwepurasita.
2. Mechanism yekuita kweHPMC mune gypsum yakatarisana nepurasita
Mushure mekuwedzera HPMC kune gypsum yakatarisana neplaster, zvivakwa zvemukati zvinovandudzwa zvakanyanya mune zvinotevera zvinhu:
Kuvandudza kuchengetedza kwemvura: Munguva yekuvaka kwegypsum yakatarisana ne plaster, kana kurasikirwa kwemvura kwakakurumidza, kunotungamirira mukuoma kusina kufanana, kuputika uye kuderedza simba. HPMC inogona kuumba yakanaka hydration firimu ari plaster, kunonoka pasi evaporation mwero wemvura, kuitira kuti plaster anogona kuchengetedza mvura yakakwana panguva kuomesa muitiro, nechokwadi ayo yunifomu kuoma, nokudaro kudzivisa chizvarwa makatsemuka.
Kuvandudza kunamatira: HPMC inogona kuumba firimu yakaonda pamusoro pepurasita, iyo inogona kuwedzera kunamatira kana inosangana nepamusoro pe substrate, kuitira kuti kusungirirwa kwepurasita pamadziro kuwedzere. Kunyanya pane porous uye yakaoma substrates, iyo yekuchengeta mvura mhedzisiro yeHPMC inogona zvakare kudzivirira iyo substrate kubva mukumedza mvura nekukurumidza, nekudaro ichivandudza chisungo chekuita.
Enhad crack resistance: Gypsum yakatarisana nepurasita inotapukana nekutsemuka nekuda kwekushanduka kwetembiricha nehunyoro.HPMC inoderedza kuomeswa shrinkage mwero nekugadzirisa evaporation mwero wemvura, nokudaro zvinobudirira kuderedza njodzi yekutsemuka mune plaster layer. Panguva imwecheteyo, iyo colloid firimu yakaumbwa neHPMC inogona zvakare kupa imwe anti-kutsemuka dziviriro kune plaster.
Kuvandudza kushanda: HPMC inogona kuwedzera viscosity uye plasticity yepurasita, zvichiita kuti zvive nyore kushanda kana uchikwesha uye kuenzanisa. HPMC inovandudza kushanda kwepurasita, uye vashandi vekuvaka vanogona kunyatso kudzora ukobvu uye flatness, iyo inobatsira kuwana yakatsetseka yekupedzisa mhedzisiro.
3. HPMC inovandudza kushanda kwegypsum yakatarisana nepurasita
Kuwedzerwa kweHPMC kune zvakawanda zvinogadziriswa pakuita kwegypsum yakatarisana ne plaster, kusanganisira:
Rheological kunatsiridza: HPMC inogona kuwedzera zvakanyanya viscosity yepurasita, kudzora kuyerera kwepurasita, kudzivirira matambudziko ekudonha, uye kugadzirisa mashandiro ebrashi.
Enhanced frost resistance: Iyo colloid firimu yakaumbwa neHPMC ine inodzivirira pane plaster kusvika pamwero wakati, ichidzivirira plaster kubva kuchando uye kuputika munzvimbo dzakaderera tembiricha, uye kuvandudza chando kuramba.
Kuvandudza shrinkage resistance:HPMC kunowedzera mwando uri mupurasita, kunoderedza dambudziko rekuputsika kunokonzerwa nekubuda kwemvura, uye kunoita kuti purasita irambe yakasimba uye isanyanya kutsemuka.
Kunatsiridza kunamatira: Iyo yekubatanidza zvivakwa zveHPMC inogona kuvandudza kunamatira kwepurasita pamusoro peiyo substrate, zvichiita kuti iyo yekupfeka isaite kudonha.
4. Chengetedzo mukushandiswa kweHPMC
Kunyangwe HPMC ine akawanda mabhenefiti egypsum yakatarisana ne plaster, zvinotevera zvinhu zvinofanirwa kucherechedzwa mukushandiswa kwayo:
Kuwedzera huwandu hwekudzora: Yakawandisa HPMC yekuwedzera ichaita kuti plaster inamira zvakanyanya, zvichiita kuti zviome kutsvedzerera, zvichikanganisa maitiro ekuvaka. Kazhinji kutaura, huwandu hwekuwedzera hweHPMC hunofanirwa kudzorwa mukati meiyo 0.1% -0.5%, uye kugadziriswa zvinoenderana nezvinodiwa chaizvo.
Kunyangwe kusanganisa:HPMC inoda kunyatsomutswa kana yakasanganiswa nezvinhu zvakaita segypsum kuti ive nechokwadi chekupararira kweyunifomu uye kuita kwakafanana. HPMC inogona kunyungudutswa mumvura kutanga, yozowedzerwa kugypsum yekusanganisa, kana inogona kusanganiswa zvakaenzana padanho rehupfu rakaoma.
Kuenderana nezvimwe zvinowedzera: Mu gypsum yakatarisana nepurasita, HPMC inowanzoshandiswa pamwe nezvimwe zvinowedzera, zvakadai semvura inoderedza, zvigadziridzo zvemvura, nezvimwewo. Paunenge uchiwedzera zvinyorwa zvakawanda, teerera kuenderana kwavo kuti urege kupindirana kunokanganisa kushanda.
5. Kukosha kweHPMC muindasitiri
Mune gypsum yakatarisana nepurasita uye zvimwe zvekuvaka, HPMC, sechinhu chinowedzera kiyi, inoita basa rakakosha mukuvandudza mashandiro emidziyo nekuda kwekuchengetedza kwayo mvura kwakanakisa, kunamatira, kukora uye kutsemuka kuramba. Mumakore achangopfuura, nekuwedzera kuri kudiwa kwezvinhu zvekuvaka zvakasvibirira, maitiro ekuchengetedza kwezvakatipoteredza eHPMC akaita kuti zvishoma nezvishoma kufarirwa nemusika. Muzvivakwa zvemazuva ano, HPMC haingogadzirise mashandisirwo egypsum yakatarisana ne plaster, asi zvakare inovandudza kunaka kwekuvaka uye kushanda nesimba, uye inosimudzira hunyanzvi hwekuvaka.
Kushandiswa kweHPMC mugypsum yakatarisana neplaster hakungokwidziri kuchengetedza kwemvura, kunamatira uye kutsemuka kuramba kwechinhu, asi zvakare kunovandudza mashandiro ekuvaka, zvichiita kuti ive yekuwedzera yakakosha mukuvaka. HPMC yakasarudzika maitiro uye akawanda-akatarisana maitiro ekuvandudza akaita kuti iwedzere kukosha mukuvaka, ichipa yakasimba rutsigiro rwehunyanzvi rwepamusoro-mhando, yakakwirira-yakasimba yekupedzisa kuvaka. Mune ramangwana, nekuenderera mberi kwekuvandudza tekinoroji yekuvaka, tarisiro yekushandiswa kweHPMC mune gypsum-yakavakirwa zvinhu ichave yakakura.
Nguva yekutumira: Nov-19-2024