Nekugadzirwa nekushandiswa kwependi yelatex inobva mumvura, sarudzo yechinhu chinosimbisa pendi yelatex inosiyana-siyana. Kugadziriswa kwerheology uye kudzora viscosity yependi yelatex kubva pamazinga ekucheka akakwira, epakati neakaderera. Kusarudzwa nekushandiswa kwezvinosimbisa pendi yelatex nependi yelatex mumasisitimu akasiyana e emulsion (pure acrylic, styrene-acrylic, nezvimwewo).
Basa guru rezvikukutu mupendi dzelatex, umo rheology iri chimwe chezvinhu zvakakosha zvinoumba chitarisiko uye mashandiro emafirimu ependi. Fungawo nezvemhedzisiro yekusviba kwepigment pakunaya kwepigment, kugona kukwesha, kuenzana, kuzara kwefirimu rependi, uye kudonha kwefirimu repamusoro panguva yekukwesha vertical. Idzi inyaya dzemhando yepamusoro dzinowanzo fungwa nevagadziri.
Kuumbwa kwependi kunokanganisa rheology yependi yelatex, uye viscosity inogona kugadziriswa nekuchinja huwandu hwe emulsion uye huwandu hwezvimwe zvinhu zvakasimba zvakapararira mupendi yelatex. Zvisinei, huwandu hwekugadzirisa hwakaganhurirwa uye mutengo wakakwira. Viscosity yependi yelatex inonyanya kugadziriswa ne thickeners. Zvinowanzo shandiswa thickeners ndeizvi: cellulose ether thickeners, alkali-swellable polyacrylic acid emulsion thickeners, non-ionic associative polyurethane thickeners, nezvimwewo. Hydroxyethyl cellulose ether thickener inonyanya kuwedzera viscosity yepakati nepasi ye latex, uye ine thixotropy yakakura. Kukosha kwezvibereko kwakakura. Chain huru ye hydrophobic ye cellulose thickener inobatanidzwa nemamorekuru emvura akakomberedza kuburikidza ne hydrogen bonding, iyo inowedzera huwandu hwemvura ye polymer pachayo. Nzvimbo yekufamba kwezvikamu yakasununguka inoderedzwa. Viscosity yesystem inowedzera, uye chimiro che network chakabatana chinoumbwa pakati pe pigment ne emulsion particles. Kuti pigments dziparadzanise, emulsion particles hadziwanzo nyere.
Nguva yekutumira: Mbudzi-02-2022