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Biaxially stretched polyester film for electrical industry and preparation method thereof

A biaxially oriented polyester and electrical industry technology, applied in the field of polyester film, can solve the problems of affecting application, reducing insulation, electrical performance, and difficulty in film production, and achieves stability, reduces production costs, and improves insulation performance. and the effect of electrical performance

Active Publication Date: 2016-01-27
ANHUI GUOFENG PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, with the development of miniaturization and miniaturization in the electronics industry, electrical thin films are also developing towards ultra-thinning. The thinner the film, the more difficult it is to produce, and the production of ultra-thin films will reduce its insulation and electrical properties. , thus affecting its application in electrical industries such as capacitors and electronic product packaging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A biaxially stretched polyester film for the electrical industry is composed of an upper surface layer, a core layer and a lower surface layer, and its preparation method is as follows:

[0022] (1) Dry and crystallize electrical grade PET in a fluidized bed at a temperature of 160°C, and then dry it in a drying tower at a temperature of 150°C for 6 hours to obtain dry raw materials;

[0023] (2) Heat the dry raw material in (1) into a molten state in the main extruder, and filter to obtain the main extruded melt as the core layer;

[0024] (3) Light calcium carbonate with a particle size of 1.2 μm and (1) dry raw materials are used to form a polyester masterbatch with a concentration of 4900ppm of light calcium carbonate;

[0025] (4) Put 80%wt of the polyester masterbatch in (3) and 20%wt of the dry raw material in (1) in two auxiliary extruders, after melting and vacuuming, filter to remove the moisture and Impurities are respectively obtained as the auxiliary extru...

Embodiment 2

[0031] A biaxially stretched polyester film for the electrical industry is composed of an upper surface layer, a core layer and a lower surface layer, and its preparation method is as follows:

[0032] (1) Dry and crystallize electrical grade PEN in a fluidized bed at a temperature of 170°C, and then dry in a drying tower at a temperature of 165°C for 4 hours to obtain dry raw materials;

[0033] (2) Heat the dry raw material in (1) into a molten state in the main extruder, and filter to obtain the main extruded melt as the core layer;

[0034] (3) Light calcium carbonate with a particle size of 20 μm and (1) dry raw materials are used to form a polyester masterbatch with a concentration of 5100 ppm of light calcium carbonate;

[0035] (4) Put 100%wt of the polyester masterbatch in (3) in two auxiliary extruders, after melting and vacuuming, and then filter to remove the water and impurities in the raw materials to obtain the upper surface layer and the lower surface layer res...

Embodiment 3

[0041] A biaxially stretched polyester film for the electrical industry is composed of an upper surface layer, a core layer and a lower surface layer, and its preparation method is as follows:

[0042] (1) Dry and crystallize electrical grade PBT in a fluidized bed at a temperature of 165°C, and then dry it in a drying tower at a temperature of 160°C for 5 hours to obtain dry raw materials;

[0043] (2) Heat the dry raw material in (1) into a molten state in the main extruder, and filter to obtain the main extruded melt as the core layer;

[0044] (3) Light calcium carbonate with a particle size of 10 μm and (1) dry raw materials are used to form a polyester masterbatch with a concentration of 5000 ppm of light calcium carbonate;

[0045] (4) Put 90%wt of the polyester masterbatch in (3) and 10%wt of the dry raw material in (1) in two auxiliary extruders, after melting and vacuuming, filter to remove the moisture and Impurities are respectively obtained as the auxiliary extru...

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Abstract

The invention discloses a biaxially stretched polyester film for the electrical industry and a preparation method thereof. The polyester film is composed of an upper surface layer, a core layer and a lower surface layer, wherein the core layer is composed of polyester, and the upper and lower surface layers are both made of 80-100%wt polyester masterbatch and 0-20%wt polyester, wherein the polyester masterbatch is composed of light calcium carbonate and polyester, and the concentration of light calcium carbonate is 4900-5100ppm. The total thickness of the polyester film made is 2~5μm, the longitudinal and transverse heat shrinkage of the film is 0.5%~1%, the relative permittivity is 2.9~3.4, the volume resistivity is 1014~1016Ω·m, and the DC breakdown voltage 2.0~2.7kV, with thin thickness, good insulation, high electric strength, especially suitable for DC electrical industry film.

Description

technical field [0001] The invention relates to the technical field of polyester films, in particular to a biaxially stretched polyester film for the electrical industry and a preparation method thereof. Background technique [0002] Polyester film is a film material made of polyethylene terephthalate as a raw material, which is made into a thick sheet by extrusion and then biaxially stretched. It has excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, friction resistance, high temperature and low temperature resistance, chemical resistance, oil resistance, air tightness and fragrance retention, and is a commonly used barrier composite film substrate One of them is commonly used as the outer material of retort packaging. Polyester film has been developed to the present. It has relative insulation and is mostly used in the electrical industry. Because polyester electrical film has many excellent characteristics, such as: non-polarity,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/06B32B27/18B32B27/36C08L67/02C08K3/26B29C69/00B29C47/06B29C55/14
Inventor 陈铸红汪中祥
Owner ANHUI GUOFENG PLASTIC
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