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Biaxially oriented poly (4-methyl-1-pentene) film and preparation method thereof

A technology of biaxial stretching and longitudinal stretching, which is applied to flat products, other household appliances, applications, etc., can solve problems such as difficulty in film formation, difficulty in controlling thickness uniformity, and easy breakage, so as to solve the problems of easy breakage, prevention of degradation, Effect of increasing plasticity and tensile properties

Active Publication Date: 2021-02-26
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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  • Biaxially oriented poly (4-methyl-1-pentene) film and preparation method thereof
  • Biaxially oriented poly (4-methyl-1-pentene) film and preparation method thereof
  • Biaxially oriented poly (4-methyl-1-pentene) film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026]Use an improved electrical grade poly-4-methyl-1-pentene resin with an ash content of less than 10ppm, a melt index of 18g / 10min, and a crystallinity of 40%. It is extruded by seven-stage heating in a nitrogen-isolated environment Extrusion by machine, extrusion temperature is 285℃, after metering pump, filter, melt pipeline, filter should be butterfly filter, melt is extruded into sheet through die, die lip opening 0.9mm, die temperature At 280°C, the melt is closely attached to the chill roll at a temperature of 90-100°C and cooled and solidified. The back side is cooled by a heated air knife. The air knife gas temperature is the same as the chill roll temperature, and the air knife gas pressure is 110 mbar. In the longitudinal stretching zone, the longitudinal preheating temperature is set at 130-150°C, and the longitudinal stretching temperature is maintained at 140-150°C to stretch 3.5 times in the length direction, and then the lengthwise heating is carried out through a...

Embodiment 2

[0028]The preparation method is the same as in Example 1. The difference is that the transverse stretching heat setting temperature is adjusted from 160°C to 120°C. The other process parameters are the same as in Example 1, and the biaxially oriented polymethylpentene film with the same thickness is prepared. The prepared polymethylpentene film is 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, 5.0 to 2.85 and 6.15, respectively, to obtain a biaxially stretched poly-4-methyl-1-pentene film of the same thickness. The performance test of the polymethylpentene film is performed, and the performance parameters are shown in Table 1.

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Abstract

The invention relates to a biaxially oriented poly (4-methyl-1-pentene) film and a preparation method thereof, and particularly belongs to the technical field of high polymer materials. The film belongs to crystalline olefin resin, and is high in heat resistance, the melting point reaches up to 240 DEG C, and the working temperature can reach 140-160 DEG C. According to the preparation method of the poly (4-methyl-1-pentene) film, by setting temperature parameters of all sections in a production line, main factors influencing crystallization, stretching orientation and shaping processes of poly (4-methyl-1-pentene) molecules are controlled, and it is guaranteed that the product performance suitable for capacitor films is obtained; in the processing course, poly (4-methyl-1-pentene) resin with the optimal molecular weight is selected, the crystallization degree of the film is controlled and material degradation is prevented according to the temperature and stretching ratio suitable forprocessing, and the biaxially oriented poly (4-methyl-1-pentene) film which is resistant to high temperature and good in thickness uniformity is continuously produced.

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 and good chemical stability. The temperature and stretching ratio of each section of the production line are suitable for control and biaxially oriented film formation. However, because the melting point of polypropylene film is between 164°C and 176°C, it is difficult to improve the heat resistance of polypropylene film. Capacitors made of polypropylene film are usually set at 70°C or 85°C in the durability test. Although high-temperature-resistant polypropylene film has been developed today, in the durability test, if the test temperature of the polypropylene film capacitor is set to 105 ℃, the working fie...

Claims

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Application Information

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Patent Type & Authority Applications(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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