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Polyester film and producing process thereof

A technology of polyester film and polyester, applied in the field of polyester film and its manufacturing, can solve the problems affecting the range and effect of use, high production cost of polyester film, production environment pollution, etc., to improve stability and performance , the effect of preventing environmental pollution

Inactive Publication Date: 2008-05-14
YIHUA GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, since various polyester films for capacitors at home and abroad do not use regenerated polyester films as additional raw materials in the manufacture, the production cost of the polyester films is usually high; at the same time, the existing polyester film production, Since most of the masterbatch slices are produced by the DMT method, and toxic methanol is used in the processing of raw materials, not only the process route for the production of polyester film raw materials is long, but also the production environment is polluted
In addition, in terms of product performance, the dielectric strength of polyester film for ordinary capacitor dielectrics is about 500V / μ at DC, about 220V / μ at AC, and the high temperature resistance is usually within 100°C. These performance indicators are relatively low, so in practice Use may affect the scope and effect of its use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]1), the selected intrinsic viscosity is 20 parts of regenerated particles of polyester waste above 0.595; 1.5 parts of super bright polyester chips containing IPA1.7% are synthesized by conventional PTA method; 55.5 parts of super bright polyester chips without any additives , whose intrinsic viscosity is above 0.62; 15 parts of polyester chip masterbatches containing silicon oxide concentration of 3200PPM; 8 parts of polyester chips containing calcium acetate 90PPM.

[0041] 2) Mix the above five kinds of slices, crystallize at 190°C, dry at 160°C for 3 hours, melt and extrude at 285°C when the water content of the slices is less than 30PPM, and cast in a quenching roll at 25°C.

[0042] 3) Longitudinal stretching was carried out at a stretching temperature of 82°C and a stretching ratio of 3.35, and cooling treatment was carried out at 35°C.

[0043] 4) Transverse stretching is carried out at a stretching temperature of 102° C. and a stretching ratio of 3.65.

[0044]...

Embodiment 2

[0048] Get 30 parts of silicon oxide polyester chips; 20 parts of regenerated particles of polyester waste; 50 parts of super-bright polyester chips; make film according to the method of Example 1, and obtain a film with a thickness of 10 μ whose properties are shown in Table 1

[0049] After the capacitor film made by this method is made into a capacitor, the withstand voltage durability becomes poor at high temperature, but it can be used normally at 85 ° C, and the dielectric loss tangent % is relatively high. Its outstanding advantage is lower cost.

Embodiment 3

[0051] Get 22 parts of silicon oxide polyester slices; get 8 parts of calcium acetate polyester slices; get 20 parts of regenerated particles of polyester waste; get 50 parts of super-bright polyester slices; make film according to the method of Example 1 to obtain a thickness of 6 μ The properties of the film are shown in Table 1

[0052] It can be seen that the addition of calcium acetate improves the performance of insulation, dielectric loss tangent, and 105°C withstand voltage durability at high temperatures.

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PUM

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Abstract

The polyester film is made with 0.62 over viscosity lustrous polyester slice, 0.58 over viscosity regenerated grain and 0.62 over viscosity monox polyester slice. The making process of the polyester film includes mixing lustrous polyester slice, regenerated grain, monox polyester slice, lustrous IPA polyester slice and calcium acetate polyester slice in certain proportion, drying, extrusion, filtering, metering, casting film, longitudinal stretching, transverse stretching, thermally setting and cutting. The polyester film has the advantages of low production cost, high product performance, high dielectric strength, high heat stability, short production process and no environmental pollution in production process.

Description

technical field [0001] The invention relates to a polyester film and a manufacturing method thereof, in particular to a polyester film which can be used as a capacitor medium and an electrical insulating material and a manufacturing method thereof. Background technique [0002] In the production process of polyester film, due to factors such as production process and manufacturing method, a large amount of waste will inevitably be produced, especially in the process of forming a film by biaxial stretching, about 20-50% of edge film and waste film will be produced If these polyester wastes cannot be recycled directly, it will certainly increase the manufacturing cost of the polyester film and bring a lot of trouble to its disposal. Since polyester films generally have good physical and chemical properties and superior electrical properties, they can often be used as capacitor dielectrics and electrical insulation materials. At present, in the production of polyester films us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L67/03
Inventor 李建新高宏保邱大宏王正康王彩虹
Owner YIHUA GROUP CORP