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A kind of biaxially stretched poly-4-methyl-1-pentene film and preparation method thereof

A technology of bidirectional stretching and longitudinal stretching, applied to flat products, other household appliances, household appliances, etc., can solve the problems of difficult film formation, easy breakage, and difficulty in controlling the uniformity of thickness, so as to solve the problems of easy breakage and increase plasticity and tensile properties, the effect of preventing degradation

Active Publication Date: 2022-07-01
ANHUI TONGFENG ELECTRONICS
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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 to overcome the problems of easy fracture, difficult control of thickness uniformity and difficult film formation in the stretching of poly-4-methyl-1-pentene film in the prior art, and to provide a biaxially stretched poly-4-methyl-1-pentene film. Method for preparing methyl 1-pentene film and film prepared by the method

Method used

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  • A kind of biaxially stretched poly-4-methyl-1-pentene film and preparation method thereof
  • A kind of biaxially stretched poly-4-methyl-1-pentene film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] An electrical grade poly-4-methyl-1-pentene resin with an ash content of less than 10ppm, a melt index of 18g / 10min, a crystallinity of 40% and an improved electrical grade was used in a nitrogen-isolated environment by a seven-stage heated main extrusion Machine extrusion, extrusion temperature 285 ℃, through metering pump, filter, melt pipeline, filter should use butterfly filter, melt is extruded into sheet shape through die head, die lip opening 0.9mm, die head temperature At 280°C, the melt adhered closely to the chill roll at a temperature of 90-100°C and was cooled and solidified. The back was cooled by a heated air knife. The gas temperature of the air knife was the same as that of the chill roll, and the gas pressure of the air knife was 110 mbar. In the longitudinal stretching area, the longitudinal preheating temperature is set at 130-150 °C, the longitudinal stretching temperature is kept at 140-150 °C, and the longitudinal direction is stretched by 3.5 times...

Embodiment 2

[0028] The preparation method is the same as in Example 1, except that the temperature of the transverse drawing heat setting is adjusted from 160° C. to 120° C., and other process parameters are the same as those of Example 1, to obtain a biaxially oriented polymethylpentene film of the same thickness, The obtained polymethylpentene film was tested for performance, and the performance parameters are shown in Table 1.

Embodiment 3

[0030] The preparation method is the same as in Example 1, except that the longitudinal and transverse stretch ratios are adjusted from 3.5 and 5.0 to 2.85 and 6.15, respectively, to obtain a biaxially stretched poly-4-methyl-1-pentene film of the same thickness, which will be prepared. The performance of the polymethylpentene film was tested, and the performance parameters are shown in Table 1.

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Abstract

The invention relates to a biaxially stretched poly-4-methyl-1-pentene film and a preparation method thereof, and specifically belongs to the technical field of polymer materials. The film belongs to crystalline olefin resin, has strong heat resistance, has a melting point as high as 240°C, and a working temperature of 140-160°C. Set the temperature parameters in the segment, try to control the main factors affecting the crystallization, stretching orientation, and shaping process of poly-4-methyl-1-pentene molecules, so as to ensure the product performance suitable for capacitor films; select the molecular weight during processing. The optimal poly-4-methyl-1-pentene resin, with suitable processing temperature and stretching ratio, can control the crystallinity of the film and prevent material degradation, and realize continuous production of high temperature resistance and good thickness uniformity. Biaxially oriented poly-4-methyl based 1-pentene film.

Description

technical field [0001] The invention relates to the field of capacitor materials, in particular to a biaxially stretched poly-4-methyl-1-pentene film and a preparation method thereof. Background technique [0002] At present, the most commonly used medium for metallized film capacitors is biaxially oriented polypropylene film. The polypropylene particles have good mechanical properties, good chemical stability, and the temperature and stretching ratio of each section of the production line are suitable for control. However, since the melting point of polypropylene film is between 164°C and 176°C, it is difficult to improve the heat resistance of polypropylene film. The test temperature of capacitors made of polypropylene film is usually set at 70°C or 85°C in the durability test. Although high temperature resistant polypropylene film has been developed, in the endurance test, if the test temperature of polypropylene film capacitor is set to 105℃, the working field strength o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D7/01C08L23/20C08K13/02C08K3/36C08K5/098C08K5/12C08J5/18
CPCB29D7/01C08J5/18C08J2323/20C08J2423/20C08K13/02C08K3/36C08K5/098C08K5/12
Inventor 储松潮潘毓娴唐兵冯玲
Owner ANHUI TONGFENG ELECTRONICS
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