Waterborne polymer modified with zeolite for environment‐friendly slow‐release coated urea

Abstract

In order to improve the slow‐release effectiveness of waterborne polymer coated fertilizers, an environment‐friendly coated urea was developed by zeolite and waterborne polymer of starch soluble, polyvinyl alcohol, sodium carboxymethyl cellulose, and chitosan. The properties of different mesh and content of zeolite on the membranes and the slow‐release property of coated urea were investigated. Zeolite decreased water vapor, ammonium permeability and porosity of waterborne polymer with an increased ammonium adsorption, and contributed to improve the slow‐release effectiveness of coated urea. In particular, zeolite‐modified waterborne polymer of 200 mesh and 3% content had best effect with 10.8%, 16.5%, and 59.8% decrease of water absorption capacity, water vapor permeability and ammonium permeability, 17.7% increase of water contact angles. Zeolite‐modified waterborne polymer coated urea for the coating contents of 7% had the best effect on the nutrient accumulate release rate. Therefore, zeolite‐modified waterborne polymers have potential to improve the slow‐release effectiveness of coated urea.

A crosslinked waterborne poly(urethane‐urea) oligomer enables mechanically strong waterborne polyacrylate–poly(urethane‐urea) hybrid films with superior film‐forming ability

“…With the increasing severity of environmental problems and the enhancement of environmental awareness, waterborne coatings have gained increasing attention in a broad range of applications including metal protection, wood decoration or building surface due to the lower release of volatile organic compounds. [1][2][3][4][5] Waterborne polyurethane (WPU) and waterborne polyacrylate (WPA) are two kinds of resins commonly used in waterborne coatings. [6][7][8] WPU has excellent adhesion, elasticity, cold resistance, high glossiness, and other characteristics, but the water resistance, weather resistance and aging resistance of a single WPU film is relatively poor and relatively high cost.…”