Development and Application Of Biaxial Oriented Poly 4-methyl-1-pentene(BOPMP)Film for Capacitor
Poly 4-methyl-1-pentene(PMP)is a new thermoplastics with isotatic structure.The PMP is crystalline resin with melting point between 220℃and 240℃and good heat resistance,can be used at high temperature and has excellent electrical insulation and dielectric performance.Compared with polypropylene resin,the melting point is higher 60℃,dielectric constant and dielectric loss are similar.With the development of electronic industry in China,the usage amount of PMP has incresed significantly in recent years.At present,the PMP is only produced by Mitsui Chemical Corporation of Japan,of which the application is limited in China due to its limted production and high price.Therefore,the method of biaxial stretching is tried to produce poly methyl pentene(BOPMP)film,process it into metallized film to produce capacitor.Finally,the performance of the capacitor is correspondingly tested and evaluated.The breakdown voltage strength of BOPMP film produced with diffrent types has large difference and the loss angle tanget value and dielectric constant of BOPMP film capacitor are close to those of BOPP film capacitor at different frequencies,but its performance under high temperature needs verification further.The important research direction is how to improve the breakdown voltage and heat resistance of BOPMP film,develop PMP parcile material suitable for biaxial streching and produce high quality BOPMP capacitor film.
metallized film capacitorpoly(4-methyl-1-pentene)biaxial stretchingBOPMP
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