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Biaxially stretched polyester film with stable electrical properties and preparation method thereof

A technology of biaxially oriented polyester and electrical properties, which is applied in the field of biaxially oriented polyester film for electrical engineering and its preparation, can solve the problems of poor post-sequence reworkability and uneven roughness of finished products, and achieves roughness of the film. The effect of improved uniformity, stable performance, and improved performance

Active Publication Date: 2020-08-04
ANHUI TONGAI ELECTRONICS MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the roughness uniformity of the finished product obtained by the existing polyester film preparation method is not high, and the post-sequence reprocessing property is not good. Therefore, a kind of thickness uniformity is provided, and the stretchability is excellent. Biaxially oriented polyester film with good heat resistance, stable electrical properties and easy processability in post-process

Method used

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  • Biaxially stretched polyester film with stable electrical properties and preparation method thereof

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Effect test

Embodiment 1

[0023] Embodiment 1: 1), choosing the ultra-bright polyester chip that the viscosity of 30% by weight is more than 0.63 contains magnesium acetate (magnesium acetate content is 180ppm), the high concentration that the viscosity of 20% by weight is more than 0.63 Nanoscale silicon oxide (particle size 2 ~ 3um, the average diameter of silicon oxide particles is about 100nm) polyester chips and 50% by weight of low-concentration silicon oxide polyester chips with a viscosity above 0.63, of which high-concentration nano-scale silicon oxide The silica concentration in the polyester chip was 18000ppm, and the silica concentration in the low-concentration silica polyester chip was 2800ppm.

[0024] 2) Mix the above three kinds of slices, pneumatically transport them to the silo, and then send them to a fluidized bed at 175°C for pre-crystallization, dry them in a drying tower at 170°C for 3-4 hours, and melt them at 280°C when the water content of the slices is less than 40ppm Extrud...

Embodiment 2

[0029] Embodiment 2: 1), choosing the ultra-bright polyester chip that the viscosity of 50% by weight is more than 0.63 contains magnesium acetate (magnesium acetate content is 230ppm), the high concentration that the viscosity of 5% by weight is more than 0.63 Nano-scale silicon oxide (particle size 0.5-1.5um, average diameter of silicon oxide particles is about 125nm) polyester chips and 45% by weight of low-concentration silicon oxide polyester chips with a viscosity above 0.63, in which high-concentration nano-scale The silicon oxide concentration in the silicon polyester chip is 19000ppm, and the silicon oxide concentration in the low-concentration silicon oxide polyester chip is 3000ppm.

[0030] 2) Mix the above three kinds of slices, pneumatically transport them to the silo, and then send them to a fluidized bed at 175°C for pre-crystallization, dry them in a drying tower at 170°C for 3-4 hours, and melt them at 270°C when the water content of the slices is less than 40...

Embodiment 3

[0035] Embodiment 3: 1), choosing the ultra-bright polyester chip that the viscosity of 70% by weight is more than 0.63 contains magnesium acetate (magnesium acetate content is 280ppm), the high concentration that the viscosity of 10% by weight is more than 0.63 Nano-scale silicon oxide (particle size 0.5-1.5um, average diameter of silicon oxide particles is about 150nm) polyester chips and 20% by weight of low-concentration silicon oxide polyester chips with a viscosity above 0.63, in which high-concentration nano-scale The silicon oxide concentration in silicon polyester chips is 20000ppm, and the silicon oxide concentration in low-concentration silicon oxide polyester chips is 3500ppm.

[0036] 2) Mix the above three kinds of slices, pneumatically transport them to the silo, and then send them to a fluidized bed at 175°C for pre-crystallization, dry them in a drying tower at 170°C for 3-4 hours, and melt them at 285°C when the water content of the slices is less than 40ppm ...

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Abstract

The invention discloses a BOPET (biaxially-oriented polyethylene terephthalate) film with stable electrical performance and a preparation method of BOPET film. The BOPET film is prepared from super-bright PET chips containing magnesium acetate, high-concentration nanoscale silicon oxide PET chips and low-concentration silicon oxide PET chips through mixing in a certain ratio, drying, extrusion, filtering, metering, refiltering, film casting, longitudinal drawing, horizontal drawing, hot setting, winding and cutting. Under the condition of thickness guarantee, the BOPET film has higher tensile strength, excellent temperature resistance, stable electrical performance and good workability in follow-up procedures, and is a substrate film applicable to electrical engineering such as capacitors, thermal insulation materials and the like.

Description

technical field [0001] The invention relates to a polyester film and a preparation method thereof, in particular to a biaxially stretched polyester film for electrical engineering and a preparation method thereof. Background technique [0002] Polyester film (PET) 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. Biaxially oriented polyester film (BOPET for short) is made of glossy material (also known as large glossy material, that is, the content of titanium dioxide in raw polyester chips is 0.1%), after drying, melting, extrusion, casting and vertical and horizontal Stretched, high-grade film for a wide variety of uses. 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 used as elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08K5/098C08K3/36B29C48/92
CPCB29C48/0018B29C55/143C08J5/18C08J2367/02C08J2467/02C08K2201/003C08K2201/011C08K2201/014C08L67/02C08L2201/08C08L2203/16C08L2205/025C08L2205/03C08K5/098C08K3/36
Inventor 束长青臧贵章沈伏良
Owner ANHUI TONGAI ELECTRONICS MATERIAL
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