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Two-way stretched polyester thin-film of capacitor and its production

A technology of biaxially stretching polyester and polyester film, which is applied to the parts of fixed capacitors, the dielectric of fixed capacitors, etc.

Inactive Publication Date: 2007-01-17
SHANGHAI ZIDONG FILM MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is no good solution to solve the problem that the polyester film for capacitors with a thickness of less than 6 μm has good processability, dielectric properties, and thermal stability at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] The technical solution of the invention is further explained in conjunction with the embodiments:

[0029] Preparation of polyester raw materials:

[0030]A certain shape of silica with a certain particle size is mixed in ethylene glycol to prepare a ethylene glycol suspension of silica, and polyester chips are produced according to the conventional polymer synthesis method (PTA method). Esterification reaction, and then polycondensation reaction. Before polycondensation, add the ethylene glycol suspension of silica and the polycondensation catalyst and stabilizer in the prior art. At 280℃, the vacuum degree is 10-66.7Pa, and the stirring speed is 80rpm. It takes 2-3 hours to prepare the mother chip, and the mother chip M1 contains 3000 ppm of Fuji Silicon S310 (particle size of 100 nm).

[0031] The processing process of the film in the example of the invention:

[0032] The polyester raw material is melted and extruded through an extruder, and electrostatically adsorbed o...

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PUM

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Abstract

A biaxially oriented polyester film with high dielectric intensity in thin type can be used on capacitor and it has features as surface resistance being greater than 1x1014, relative dielectric constant being greater than 2.8, DC dielectric intensity being greater than 450 and frictional coefficient being less than 0.60. Its preparing method includes using proper additives and polyester pellets as raw material, utilizing special polyester film production device and applying biaxially oriented polyester film process to prepare said biaxially oriented polyester film.

Description

Technical field [0001] The invention relates to a biaxially stretched polyester film, in particular to a biaxially stretched polyester film suitable for use in miniature capacitors. At the same time it relates to the production method of the film. Background technique [0002] As a film, plastic films can be produced continuously in large quantities, although they cannot be obtained with other materials. Due to their high strength, durability, transparency, flexibility and good surface characteristics, they are widely used in various fields such as magnetic recording media, agriculture, packaging, construction materials, etc. In summary, biaxially oriented polyester films are used in various fields because they have excellent performance in mechanical properties, thermal properties, electrical energy and chemical resistance. Especially as the base film of tapes, they are Unmatched by other materials. [0003] In addition to excellent mechanical and chemical properties, polyester ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/14H01G4/18C08J5/22
Inventor 徐志强窦立岩唐延寿吴建平陈国刚
Owner SHANGHAI ZIDONG FILM MATERIAL CO LTD
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