Preparation and Properties of the Water-Based Acrylate Adhesive for Biaxially Oriented Polypropylene
To cope with the increasing demands for biaxially oriented polypropylene(BOPP)adhesives brought about by the rapid development of express industry,this study aimed to develop a water-based acrylate adhesive suitable for BOPP films.A semi-continuous emulsion polymerization process was employed to investigate the effects of acrylic acid(AA)and β-hydroxyethyl methacrylate(HEMA)on the viscosity,solid content,and particle size of the adhesives.The relationships among structures,rheology and adhesive properties of the adhesives were analyzed using an extensional rheometer.Adhesive strength on the BOPP substrate was evaluated.The results indicate that the addition of composite functional monomers has little effect on the emulsion particle size,the particle size of the emulsion is maintained at about 250 nm.The composite functional monomers could enhance the interactions between fluid molecules,leading to an increase of adhesive viscosity.Rheology and contact angle analyses show that the adhesive with a 2%mass fraction composite functional monomer exhibits the lowest cohesive energy,flexible molecular chains,and a contact angle of 92.4°.These properties facilitate the adhesives to infiltrate on the surface of the BOPP film,improving the adhesive strength.The acrylate adhesive synthesized via a 2%mass fraction composite functional monomer possesses the best performances,with a peel strength of 21.44 N/50mm on the BOPP film,low viscosity,and high solid content.It has a good market application prospect.
万方数据
维普
