Synthesis And Properties Of Water-soluble Acrylic Resine Used For Modification Of Bopet Film

Biaxial orientation polyethylene terephthalate(BOPET) film is widely used in printing, packaging and so on for its excellent comprehensive properties. But its surface tension is lower which couldn't meet the application requirements, so we must improve the surface properties of BOPET film. However the surface tension of BOPET corona film would degradate during conservation in actual application. Especially in the hot and humid conditions, it decrease rapidly, which resulting in the aluminum plate and printing ink easily fall off from the film. Thus the corona aluminum laminated BOPET films cannot match the need of package at high lever. How to improve the surface energy of poly film and maintain stability at longer time is a common problem of abroad and home industry. The purpose of this project is looking for a kind of water-soluble acrylic resin used as paint for the modification of poly film,and improve resistance degradation of surface tension and water -resisted of BOPET film under the fastness of aluminum layer.Firstly,the paper studied the copolymerization system considering the properties of BOPET film. The results show that,when methyl methacrylate(MMA), butyl acrylate(BA), acrylic acid(AA) and 2-hydroxyethylmethacrylate (HEMA) are used as monomers of copolymer,the hydrosol synthesized by solution polymerization has outstanding propetries,and smootht ransparency coating can be obtained with the paint based the resin.The paper researched the effect of monomer content on properties of coating film and found the optimization process parameters. Repeat and magnify experiment results showed that the process has better repeatability and stability. We obtained the high surface tension of 56mN·cm^-1, adhesion of 0 level and good water -resisted of coating resin by self-crossing modification. DSC and TG results indicated that the crossing modification resin has better thermal stability.Finally, according to the properties of aluminum laminated films, the coating process was researched to determine the coating process parameters. The BOPET coating film has better properties of resisting degradation of surface tension under the condition of the best coating process parameters. The surface tension only reduce 5 mN·cm^-1 after 70h in the hot air of 90℃.And the aluminum layer's adhesion of BOPET coating aluminum laminated film is still as high as 1.86 N/15mm after being treated 20min in boiling water,which indicated that it has excellent properties of boiled water- resisted. At last, the paper analyzed the mechanism of degradation of the BOPET film's surface tension and the adhesion fastness and shedding theory of the aluminum layer.