The Preparation And Research Of Raw Materials For The High-Transparent Polyester Film

In the film production process, there will be adhesion, this process will add a variety of additives, while the transparency of the film decline.In this paper , we make SiO₂ powder that be treated by KH-570 blend with EG.We synthetic PET by Semi-continuous esterification method and test the PET by X-Ray,DSC,SEM,etc.We analysis the treated powder and find that the SiO₂ that place over a long period of time will reunite。After ultrasonic treatment SIO₂ can be effectively dispersed in the EG, and with the time of ultrasound,the dispersity will be better.Through the IR and TG,we find that SiO₂ and KH-570 occurred in a chemical reaction,When the quality of the SiO₂ and KH-570 is 1:1 ,KH-570 can achieve the complete package SiO₂ surface coverage.The modified PET of the SEM test showed that the modified SiO₂ can be dispersed evenly in the PET, with the increase in the amount of SiO₂, the effect of dispersion descend, with the ultrasound time, dispersion effect will be betterThrough the viscosity of the test , the nanocomposite of molecular weight and viscosity increases with the content coming down. DSC shows that with the increasing of SiO₂ ,PET's Tg, Tc decline, Tm up after the first drop.The crystallization of PET performance tests show that SiO₂ in the PET played the role of the nucleating agent, with the addition of SiO₂ increases, the crystallization rate of change fast, crystallinity increases.