Redispersible latex poda nemamwe ma inorganic binders (sement, slaked lime, gypsum, etc.) uye akasiyana aggregates, mafirita uye zvimwe zvinowedzera (senge methyl hydroxypropyl cellulose ether, starch ether, lignocellulose, hydrophobic agent, nezvimwewo) yekusanganisa kwemuviri. kugadzira dhaka rakaoma-musanganiswa.Kana iyo yakaoma-yakavhenganiswa dhaka inowedzerwa kumvura uye inokurudzirwa, iyo latex powder particles ichaparadzirwa mumvura pasi pechiito che hydrophilic protective colloid uye mechanical shear.Nguva inodiwa kuti yakajairika redispersible latex poda ipararire ipfupi kwazvo, uye iyi redispersion time index zvakare yakakosha parameter yekuongorora kunaka kwayo.Muchikamu chekutanga chekusanganiswa, latex powder yakatotanga kukanganisa rheology uye kushanda kwevhu.
Nekuda kwehunhu hwakasiyana uye kugadziridzwa kwega yega yakakamurwa latex poda, mhedzisiro iyi zvakare yakasiyana, vamwe vane kuyerera-kunobatsira mhedzisiro, uye vamwe vane inowedzera thixotropy mhedzisiro.Nzira yekushanda kwayo inobva kune zvakawanda, kusanganisira simba re latex powder pakubatana kwemvura panguva yekupararira, kushandiswa kwemaitiro akasiyana-siyana e latex powder mushure mekupararira, simba rekudzivirira colloid, uye simba resimende nemabhandi emvura.Kufurira kunosanganisira kuwedzera kwehuwandu hwemhepo mudhaka uye kugoverwa kwemhepo mabhubhu, pamwe nekufurira kweayo ekuwedzera uye kupindirana nezvimwe zvinowedzera.Naizvozvo, yakasarudzika uye yakakamurwa kusarudzwa kwe redispersible latex poda inzira yakakosha yekukanganisa kunaka kwechigadzirwa.Iyo inonyanya kuzivikanwa maonero ndeyekuti redispersible latex powder inowanzowedzera mhepo yevhu, nekudaro ichiisa kuvakwa kwedhaka, uye hukama uye viscosity ye latex powder, kunyanya iyo inodzivirira colloid, kumvura kana yakapararira. Kuwedzera kwekusungirirwa kunobatsira kuvandudza kubatana kwevhu rekuvaka, nekudaro kuvandudza kushanda kwedhaka.Zvadaro, dhaka rakanyorova rine latex poda dispersion rinoiswa panzvimbo yebasa.Nekudzikiswa kwemvura pamatanho matatu - kunyura kwechigadziko, kushandiswa kwesimende hydration reaction, uye kunyungudika kwemvura yepasi kuenda kumhepo, zvidimbu zveresin zvishoma nezvishoma zvinosvika, iyo inopindirana zvishoma nezvishoma inobatana, uye pakupedzisira inova. firimu repolymer rinopfuurira.Izvi zvinonyanya kuitika mumapores evhu uye pamusoro peiyo yakasimba.
Zvinofanira kusimbiswa kuti kuita kuti muitiro uyu usadzoke, ndiko kuti, apo firimu repolymer rinosangana nemvura zvakare, harizoparadzwi zvakare, uye iyo inodzivirira colloid ye redispersible latex powder inofanira kuparadzaniswa kubva kune polymer film system.Iri harisi dambudziko mune alkaline simende dhaka system, nekuti ichave saponified nealkali inogadzirwa nesamende hydration, uye panguva imwe chete, adsorption yezvinhu zvakaita se quartz ichaiparadzanisa zvishoma nezvishoma kubva muhurongwa, pasina kuchengetedzwa kwe. hydrophilicity Colloids, iyo isinganyungudika mumvura uye inoumbwa nekamwe-nguva kupararira kwe redispersible latex powder, inogona kushanda kwete pasi pemamiriro akaoma, asiwo pasi pemvura yakareba kwenguva refu.Mune zvisiri-alkaline masisitimu, senge gypsum masisitimu kana masisitimu ane mafirita chete, nekuda kwechimwe chikonzero iyo inodzivirira colloid ichiripo muchikamu chekupedzisira chepolymer firimu, izvo zvinokanganisa kushomeka kwemvura kwefirimu, asi nekuti masisitimu aya haashandiswe Mu. nyaya yekunyudzwa kwenguva refu mumvura, uye iyo polymer ichine yayo yakasarudzika mechanical properties, haikanganisi kushandiswa kwe redispersible latex powder mune idzi masisitimu.
Nekuumbwa kweiyo yekupedzisira polymer firimu, sisitimu inoumbwa neinorganic uye organic binders inoumbwa mudhaka rakaporeswa, kureva kuti, iyo hydraulic zvinhu inoumba brittle uye yakaoma sisitimu, uye iyo redispersible latex poda inoumba firimu pakati pegomba uye. nzvimbo yakasimba.Flexible connection.Iyi mhando yekubatanidza inogona kufungidzirwa seyakabatanidzwa kune yakaoma skeleton nezvitubu zvidiki zvakawanda.Sezvo kusimba kwekusimba kwepolymer resin firimu inoumbwa nelatex poda kazhinji kurongeka kwehukuru hwepamusoro kupfuura iyo yezvigadzirwa zvehydraulic, kusimba kwedhaka pachayo kunogona kuvandudzwa, ndiko kuti, kubatana kunovandudzwa.Sezvo kushanduka uye kuparara kwepolymer kwakakwirira kudarika iyo yakaomeswa chimiro sesimende, kukanganisa kwedhaka kunovandudzwa, uye mhedzisiro yekuparadzira kushushikana inovandudzwa zvakanyanya, nekudaro inovandudza kutsemuka kupikisa kwedhaka.
Nguva yekutumira: Mar-07-2023