PET (polyethylene terephthalate) composite for producing thermal aging resistant insulating film and preparation method of PET compound

Abstract

The invention relates to a PET (polyethylene terephthalate) composite for producing a thermal aging resistant insulating film. The PET composite comprises the following raw materials in parts by mass: 100 parts of PET chips, 0.1-1.0 part of bisoxazolinyl benzene, 0.1-1.0 part of pentaerythritol, 0.1-1.0 part of triphenyl phosphite and 0.01-0.50 part of bisphenol A type epoxy resin, wherein the softening point of the bisphenol A type epoxy resin is 85-155 DEG C; the epoxy value of the bisphenol A type epoxy resin is 0.02-0.14eq / 100g. The PET composite is simple in process procedures, the high-temperature degradation speed of the PET can be reduced, the thermal aging resistance of the PET composite can be improved, the service life of the insulating film under a high-temperature condition can be prolonged, and the PET composite is free of additives harmful for human bodies and the environment, and can be used for producing the thermal aging resistant insulating film of a grade of 190 DEG C.

Description

Technical field [0001] The invention relates to a PET composite used for producing a heat-resistant aging insulating film and a preparation method thereof, and belongs to the technical field of polyester film manufacturing. Background technique [0002] Polyethylene terephthalate (PET) is a crystalline polymer with excellent creep resistance, fatigue resistance, friction resistance, abrasion resistance, chemical resistance, dimensional stability, gas and Low water vapor permeability and excellent electrical insulation. It is widely used in automotive, electrical and electronic, insulating materials and other fields. Biaxially oriented PET film has excellent physical and mechanical properties in a wide temperature range. It can be used for a long time at 120°C, and can withstand high temperatures of 150°C for short-term use. It is widely used in plate making, packaging, optical, and insulating films. In recent years, along with the development of electrical or electronic componen...

AI Technical Summary

Problems solved by technology

[0009] At present, in order to improve the heat resistance of PET film, a small amount of (auxiliary) antioxidant, heat stabilizer and nucleating agent are added on the basis of PET slices, but each antioxidant, heat stabilizer and nucleating agent are not easy to produce in PET film. Uniform dispersion in the resin seriously affects the PET molecular chain structure and the biaxial stretching production process of the insulating film, as well as the surface smoothness, gloss, electrical insulation performance and mechanical properties of the insulating film

Furthermore, the temperature of the PET insulating film during extrusion is as high as 280°C or more, and the additives such as antioxidants will be partially decomposed during the processing process, and migration and precipitation will occur during the film making process. The heat resistance effect is not obvious enough, which affects the long-term heat and oxygen resistance performance of the film, and the operability is poor

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