Study On Synthesis And Emulsification Of Waterborne Epoxy Acrylic Resin For UV Curing

UV curable waterborne coatings is non-toxic,harmless,nonirritating,safety and environmental protection and construction safety has been widely used,UV curable waterborne epoxy acrylate oligomer after curing have good heat resistance,strong corrosion resistance,good weatherability so propertysis the hotspot of current research and developmeant of UV waterborne oligomer.In this paper,bisphenol A epoxy resin E-128 and E=301 as basic raw materials,esterificatioin with acrylic monomer(-CODFH),introduction of double bonds and hydrophilic groups,the synthesis of molecular weight and molecular weight distribution of uniform prepolymer of waterborne epoxy acrylic(EA,EB),and the use of epoxy acrylate prepolymer EB emulsion prepared UV Curing Waterborne Coatings,test result:(1)When n(Molar Number of Epoxy Groups)yn(Molar Number of Carboxyl Groups)=1:1.05,wt(Catalyst dosage-DMBA)=1.0%,wt(Inhibitor dosage-MEHQ)=0.5%;The Prepolymer of waterborne epoxy acrylic type 128 EA:85?×1h+100?×2h+110?×1h,Get Mn is 462.37g.mol-1,Mw is 498.21 g·mol-1,PDI is 1.0775;The synthetic process system the type 301EA:85?×2h+100?×2h+110?×1h,Get:Mn is 1359.7 g·mol-1,Mw is 2566.5 g·mol-1,PDI is 1.8876.(2)Whenwt(Catalyst dosage=DEAB)=1.0%,wt(Inhibitor dosage-MEHQ)=0,1%;The Prepolymer of waterborne epoxy acrylic type128 EB:70?×1.5 h,Get:Mn is 575,8 g·mol-1 Mw is 629.7 g·mol-1?PDI is 1,09;The synthetic process system the type 301 EB:80?×1.5h,Get:Mn is 1483.3 g·mol-1,Mw is 2760.7 g·mol-1,PDI is 1.86.(3)When the degree of neutralization of triethylamine is 100%,n(The number of moles of EA hydroxy epoxy resin)/n(The number of moles of anhydride)=1:1.2,Epoxyacrylic resin emulsion type 128 solid content is 95%,Particle size is 38.2nm,Viscosity is 846mPa·s;Type 301 solid content is 95%,Particle size is 48.2nm;Viscosity is 1746mPa·s.(4)When the solid content of Waterborne UV curable coatings is 95%,The ratio of two glue ingredients(w(128)/w(301))is2:3,Photoinitiator dosage is w/t(184/BP=1:1)=3.24%,Coating film thickness is25?m,UV cured coatings adhesion 0 grade,Flexibility is 1 mm,Impact strength is 55 cm,Water absorption is 5%,Water resistance is 168h of UV curing waterborne epoxy acrylic resin coating.