Nekuvandudzwa uye kushandiswa kwemvura-based latex pendi, kusarudzwa kwelatex pendi thickener kwakasiyana. Kugadziriswa kwerheology uye viscosity kudzora kwelatex pendi kubva kumusoro, yepakati uye yakaderera shear mitengo. Kusarudzwa uye kushandiswa kwezvakakora zvependi yelatex uye latex pendi mune akasiyana emulsion masisitimu (pure acrylic, styrene-acrylic, nezvimwewo).
Basa guru remakobvu mune latex pendi, umo rheology chimwe chezvinhu zvakakosha zvinoumba kutaridzika uye kuita kwemafirimu epende. Uyezve funga nezve mhedzisiro yeviscosity pane pigment kunaya, brushability, kuenzana, kuzara kwefirimu repende, uye sag yefirimu repamusoro panguva yekukwesha yakatwasuka. Idzi inyaya dzemhando dzinowanzo fungwa nevagadziri.
Kuumbwa kwekuputira kunokanganisa rheology yepende ye latex, uye viscosity inogona kugadziriswa nekushandura kusanganiswa kwe emulsion uye kusanganiswa kwezvimwe zvinhu zvakasimba zvakaparadzirwa mupende ye latex. Zvisinei, chiyero chekugadzirisa chishoma uye mari yacho yakakwirira. Iyo viscosity yepende ye latex inonyanya kugadziriswa ne thickeners. Inowanzo shandiswa thickeners ndeiyi: cellulose ether thickeners, alkali-swellable polyacrylic acid emulsion thickeners, non-ionic associative polyurethane thickeners, etc. Hydroxyethyl cellulose ether thickener inonyanya kuwedzera yepakati uye yakaderera shear viscosity ye latex pendi, uye ine thixotropy yakakura. Iko kukosha kwegoho rakakura. Iyo hydrophobic main chain ye cellulose thickener inosanganiswa nemamorekuru emvura akatenderedza kuburikidza nehydrogen bonding, iyo inowedzera huwandu hwemvura yepolymer pachayo. Nzvimbo yekusununguka kwekufamba kwezvikamu inoderedzwa. Iyo viscosity yehurongwa inowedzerwa, uye muchinjika-yakabatana network inoumbwa pakati pe pigment uye emulsion particles. Kuti aparadzanise mavara kubva kune mumwe nemumwe, emulsion particles haawanzo adsorb.
Nguva yekutumira: Nov-02-2022