Preparation And Characterization Of Hydroxy Acrylic Resin

In this paper,the preparation process and properties of high solids hydroxy acrylic resin were investigated.High solids hydroxy acrylic resin was yield using glycidyl ester of versatic acid(Shivena-9),styrene(St),hydroxyethyl acrylate(HEA),methyl methacrylate(MMA),butyl acrylate(BA)acrylic acid(AA)as main monomers,di-tert-pentyl peroxide(DTAP)as an initiator,mercaptoethanol(ME)as a chain transfer agent,xylene as solvent by free radical polymerization and semi-continuous solution polymerization process.The effects of functional monomer such as dodecafluoroheptyl methacrylate(MBFA-12)and vinyltriethoxysilane(VTEO)on the properties of hydroxy acrylic resin were investigated.Two-component polyurethane were obtained by reaction between hydroxy acrylic resin and IPDI trimer.The preparation and properties of polyurethane films were detailedly studied.Finally,a two-component polyurethane coating film with good adhesion,good salt and water resistance was obtained.The effect of the amount of ME,DTAP,Shivena-9 and functional monomers MBFA-12 and VTEO on the properties of resin and polyurethane films were studied.The polyurethane films were characterized by fourier transform infrared spectroscopy(FT-IR),thermogravimetric analyzer(TGA),differential scanning calorimetry(DSC)and contact angle tester.The results show that resins with low viscosity narrow molecular weight distribution are obtained when the amount of DTAP and ME is 4% and 2% respectively.The thermal decomposition temperature(Td5)(the quality loss of the polyurethane coating film was 5%)was gradually increased with the increase in the amount of Shivena-9 from20% to 30%.Increasing the amount of MBFA-12 can significantly reduce the viscosity of the resin,but it will affect the conversion of the monomers.When the amount of MBFA-12 is increased from 0% to 15%,the contact angle of the two-component polyurethane coating film and Td5 are increased with the coating film better acid and alkali resistance.On the basis of 9% of MBFA-12,the introduction of VTEO can significantly increase the contact angle of the polyurethane coating film.Finally,a hydroxy acrylic resin with a solid content of 90% is obtained,which satisfies the requirement of reducing the volatile organic compound(VOC)of the coating.The obtained two-component polyurethane film has good adhesion,salt water resistance and comprehensive performance,which can meet the requirements of automotive refinish paint.