Polyester film for electrical insulation

A technology of electrical insulation and polyester film, applied in the direction of organic insulators, plastic/resin/wax insulators, layered products, etc., can solve problems such as high cost, poor visibility, and increased leakage, and achieve good apparent density Effect

Inactive Publication Date: 2000-01-19
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (2) In the above-mentioned refrigerant device, if the heat-resistant film is used alone, the cost will be high
[0008] (3) When used for motor insulation, etc., molding processability (th...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0014] The polyester used in the polyester film of the present invention refers to a polymer crystalline thermoplastic resin composition obtained through esterification, and this polyester is obtained by polycondensation of a dicarboxylic acid component and a glycol component .

[0015] As the dicarboxylic acid component, terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid, cyclohexanedicarboxylic acid, diphenylethanedicarboxylic acid, etc. can be used, and as the glycol component, ethylene glycol and propylene glycol can be used. , 1,4-butanediol, cyclohexanedimethanol, etc. Among them, terephthalic acid and naphthalene-2,6-dicarboxylic acid are preferable as the acid component, and ethylene glycol and propylene glycol are preferable as the glycol component.

[0016] The melting point of the polyester is preferably 250° C. or higher from the viewpoint of heat resistance, and preferably 300° C. or lower from the viewpoint of productivity. Examples of such idea...

Embodiment 1～8、 comparative example 2～4

[0057] With the calcium acetate of 0.09 weight part as catalyst, with the dimethyl terephthalate of 85 weight parts and the ethylene glycol of 60 weight parts, carry out transesterification reaction by conventional method, add the trimethyl phosphate containing 0.20 weight % then Ethylene glycol solution, then add the ethylene glycol slurry containing calcium carbonate with an average particle size of 1.1 μm, relative to polyethylene terephthalate, the content of calcium carbonate is as shown in Table 1, then, with 0.03 parts by weight of antimony trioxide is used as a catalyst for polycondensation reaction to prepare polyethylene terephthalate with an intrinsic viscosity of 0.68dl / g.

[0058] After the polyethylene terephthalate was vacuum-dried at 170°C, it was supplied to an extruder heated to 280°C, extruded through a T-shaped die, and cooled and solidified with a cooling drum at 30°C to obtain an unstretched membrane. Then heat the film to 85-95°C, stretch it 3.3-4.1 tim...

Embodiment 9

[0061] With the same method as Example 1, only the polyethylene terephthalate with an intrinsic viscosity of 0.51dl / g was obtained, and samples were prepared with the same calcium carbonate addition and film-making conditions. In addition, when polyethylene terephthalate having an intrinsic viscosity of 1.6 dl / g was used, the stretching stress was too high, so stretching could not be performed at all. Example 10, 11

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Abstract

A polyester film for electrical insulation is characterized in that the apparent density of the film is 1.37-0.85 g/cm<3>; the tension elastic modulus is 2.0-4.5 GPa. A film which includes little low polymer, low cost, excellent heat resistance, impact endurance test resistance, forming processing performance, good assembly stability and better identify performance can be made. In addition, the film can reduce leakage current when being used on motor for insulation.

Description

field of invention [0001] This invention relates to polyester films and laminated films for electrical insulation. More specifically, it relates to polyester films and laminated films used for insulation of motors on compressors used in refrigeration devices such as refrigerators and air conditioners, and various electrical insulation. The purpose is to reduce the content of oligomers and improve the quality of assembled devices Stability, visibility of dyed device parts, molding processability, etc., and reduction of leakage. Background of the invention [0002] In the past, the method of using polyester film with high intrinsic viscosity was adopted to reduce the content of oligomers. In addition, the method of using terminal blocking agent was adopted to improve the hydrolysis resistance of polyester film. [0003] In addition, in order to satisfy the above two characteristics at the same time, although various methods of using heat-resistant films can also be adopted, t...

Claims

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Application Information

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IPC IPC(8): B32B27/36C08J5/18H01B3/30
Inventor 永井逸夫青木精三出口雄吉
Owner TORAY IND INC
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