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Preparation method of synchronously-stretched polypropylene high-temperature-resistant film for wireless charging

A technology of synchronous stretching and wireless charging, which is applied in the field of polypropylene film, can solve the problems that polypropylene film cannot be mass-produced, ultra-thin films cannot be solved, and longitudinal thermal shrinkage is large, so as to improve film-forming property and thickness uniformity , the effect of large adjustment space

Active Publication Date: 2020-06-09
泉州嘉德利电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production of ultra-thin films faces difficulties such as difficult film formation, difficulty in mass production, and large longitudinal thermal shrinkage.
At present, domestic manufacturers of polypropylene films for capacitors cannot mass-produce polypropylene films with a thickness below 2.5 μm. Moreover, the production lines of polypropylene films for capacitors in China all use asynchronous stretching, which cannot solve the difficulties faced by ultra-thin films.

Method used

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  • Preparation method of synchronously-stretched polypropylene high-temperature-resistant film for wireless charging

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Embodiment 1

[0031] A method for preparing a synchronously stretched polypropylene high temperature resistant film for wireless charging

[0032] Include the following steps:

[0033] Step I, raw material preparation: dry the raw material for 3 hours at a temperature of 100° C., and set aside; wherein, the raw material is polypropylene with an isotacticity of 98.1% and an ash content of 15 ppm, p-dimethyldibenzylidene sorbitol and Modified silica; the mass ratio of polypropylene, p-dimethyldibenzylidene sorbitol and modified silica is 10:0.01:0.65; the preparation process of modified silica is as follows: the mass fraction is 1.5% Add silicon dioxide to the modified agent solution and stir and mix for 3 minutes, then grind and disperse for 2 hours, and finally filter and dry to obtain the modified silicon dioxide; wherein, in the modified agent solution, sodium lauryl sulfate, dopamine, The mass ratio of propylene glycol and water is 1:0.6:3:15; the mass ratio of modifier solution to sili...

Embodiment 2

[0039] A method for preparing a synchronously stretched polypropylene high temperature resistant film for wireless charging

[0040] Include the following steps:

[0041]Step I, raw material preparation: dry the raw material for 4 hours at a temperature of 120° C., and set aside; wherein, the raw material is polypropylene with an isotacticity of 98.9% and an ash content of 20 ppm, p-dimethyldibenzylidene sorbitol and Modified silica; the mass ratio of polypropylene, p-dimethyldibenzylidene sorbitol and modified silica is 10:0.02:0.65; the preparation process of modified silica is as follows: the mass fraction is 3.5% Add silicon dioxide to the modified agent solution and stir and mix for 5 minutes, then grind and disperse for 6 hours, and finally filter and dry to obtain the modified silicon dioxide; wherein, in the modified agent solution, sodium lauryl sulfate, dopamine, The mass ratio of propylene glycol and water is 2:0.6:3:15; the mass ratio of modifier solution to silic...

Embodiment 3

[0047] A method for preparing a synchronously stretched polypropylene high temperature resistant film for wireless charging

[0048] Include the following steps:

[0049] Step 1, raw material preparation: the raw material is dried under the condition of 105 ℃ for 4 hours and set aside; wherein, the raw material is polypropylene with isotacticity of 98.3% and ash content of 16ppm, p-dimethyldibenzylidene sorbitol and Modified silica; the mass ratio of polypropylene, p-dimethyldibenzylidene sorbitol and modified silica is 10:0.02:0.65; the preparation process of modified silica is as follows: the mass fraction is 2.0% Add silicon dioxide to the modifying agent solution and stir and mix for 5 minutes, then grind and disperse for 3 hours, and finally filter and dry to obtain the modified silicon dioxide; wherein, in the modifying agent solution, sodium lauryl sulfate, dopamine, The mass ratio of propylene glycol and water is 1.2:0.6:3:15; the mass ratio of modifier solution to si...

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Abstract

The invention discloses a preparation method of a synchronously-stretched polypropylene high-temperature-resistant film for wireless charging. The preparation method of the synchronously-stretched polypropylene high-temperature-resistant film for wireless charging comprises the steps of raw material preparation, extrusion molding, synchronous stretching and stretching aftertreatment. According tothe synchronously-stretched polypropylene high-temperature-resistant film for wireless charging, a synchronously-stretched polypropylene film production line is selected, a longitudinal and transversesynchronous stretching technology is adopted, and compared with an asynchronously-stretched production line in which the polypropylene film is stretched longitudinally and then transversely, the polypropylene film produced by the synchronous stretching line has the advantages that the longitudinal stretching strength of the polypropylene film is greatly improved by about 20 percent, and the mechanical property, the electrical property and the thickness uniformity of the polypropylene film are greatly improved.

Description

technical field [0001] The invention relates to the technical field of polypropylene films, in particular to a method for preparing a synchronously stretched polypropylene high-temperature-resistant film for wireless charging. Background technique [0002] With the rapid development of technology and the rapid development of electric vehicles and electronics industries, wireless charging technology has become a hot research topic today. At present, wireless charging technology has begun to be widely used in charging piles and mobile phones, and its advantages are mainly convenience and safety. The requirements for capacitors in wireless charging technology are small size, large capacity, and high temperature resistance. Furthermore, the capacitance of a capacitor is inversely proportional to the thickness of the medium. [0003] In order to meet the needs of use, thinner films must be developed as insulating media. However, the production of ultra-thin films faces difficu...

Claims

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Application Information

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IPC IPC(8): H01G4/14H01G4/33H01G13/00B29C48/00B29C48/08B29C55/14
CPCB29C55/14B29C48/0018B29C48/08H01G4/14H01G4/33H01G13/00
Inventor 黄炎煌
Owner 泉州嘉德利电子材料有限公司
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