Nhanganyaya yeRDP-Redispersible Polymer Powder

Redispersible polymer poda (RDP) ipolymer yakavakirwa poda inoshandiswa mune akasiyana maapplication muindasitiri yekuvaka. RDP yakawanikwa nekupfapfaidza kuomeswa kwepolymer emulsions. Inoshandiswa zvakanyanya mumasisitimu esimende kuvandudza zvimiro zvedhaka senge adhesion, kushorwa kwemvura uye flexural simba.

RDP inoumbwa nemhando dzakasiyana dzemapolymers, anosanganisira vinyl acetate-ethylene (VAE), styrene-butadiene (SB), ethylene-vinyl chloride (EVC), uye polyvinyl doro (PVA). Aya mapolymer akagadzirwa kuti aenderane nemhando dzakasiyana dzemabhainda semendi, lime uye gypsum. Izvo zvinoshandiswa mumhando dzakasiyana-siyana dzekushandisa dzinosanganisira mataira adhesives, self-leveling compounds, waterproofing membranes uye kunze kwekudzivirira uye kupedza masisitimu (EIFS).

Iyo yekugadzira maitiro eRDP ine matatu makuru matanho: polymerization, emulsification uye kupfapfaidza kuomesa. Muchikamu chepolymerization, mamonomers anogadzirwa pasi pemamiriro chaiwo, akadai sekushisa, kumanikidza uye nguva yekuita. Iyo inokonzeresa polymer dispersion inodzikamiswa nema surfactants kudzivirira particle agglomeration. Mune emulsification nhanho, iyo polymer dispersion inogadziriswa zvakare kuti iite emulsion, iyo inozopfapfaidzwa yakaomeswa kuwana RDP. Munguva yekupfapfaidza kuomeswa, mvura inoputika kubva mumadonhwe emulsion, ichigadzira polymer particles. Hupfu hunobuda hunobva hwaunganidzwa uye hwoiswa mukati kuti hutumirwe.

Izvo zvivakwa zveRDP zvinoenderana nezvakati wandei zvakaita serudzi rwepolymer, saizi yechikamu uye chimiro chemakemikari. Iyo inonyanya kushandiswa polymer yeRDP ndeye VAE, ine yakanakisa adhesion uye kudzivirira mvura. Iyo particle size yeRDP inogona kusiyanisa kubva kune mashoma mamicrons kusvika mashoma mamirimita, zvichienderana nekushandisa. Iyo kemikari inoumbwa yeRDP inogona zvakare kusiyana zvichienderana neinodiwa zvivakwa. Semuyenzaniso, maRDP anogona kuve neakawedzera ekuwedzera senge plasticizers, dispersants uye thickeners kuwedzera zvivakwa zvavo.

RDP ine zvakawanda zvakanaka pamusoro pemamwe marudzi emapolymer anoshandiswa mukuvaka. Imwe yemabhenefiti makuru kugona kwayo kupararira mumvura. Izvi zvinoreva kuti RDP inogona kusanganiswa nemvura kuti iite emulsion yakagadzikana, iyo inogona kushandiswa mune zvakasiyana-siyana zvekushandisa. Iyo redispersibility yeRDP inoenderana nemakemikari ayo uye saizi yechikamu. Zvimedu zveRDP zvakagadzirirwa kuti zvienderane nemvura uye zvinopararira nekukurumidza kana zvakasanganiswa nemvura.

Imwe mukana weRDP kugona kwayo kuvandudza mashandiro esimende masisitimu. RDP inogona kuvandudza kunamatira pakati pedhaka uye substrate, kuderedza shrinkage uye kuwedzera simba redhaka. Inovandudzawo kudzivirira kwemvura kwedhaka, kudzivirira kupinda kwemvura uye kuderedza njodzi yemamiriro ekunze.