Preparation method of hard elastic polypropylene film

A polypropylene film, hard elastic technology, applied in the field of polymer chemistry, can solve the problems of complex preparation process of microporous film, low elastic recovery rate, high equipment investment, etc.

Inactive Publication Date: 2010-04-28
JIANGSU SHENLONG VENTURE GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The elastic recovery rate of the existing hard elastic polypropylene film is low, and the elastic recovery rate is only about 90%, which results in complicated preparation process and high equipment investment for the microporous film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The isotacticity is ≥96%, the density is 0.9±0.05g / cm 3 The extrusion grade polypropylene resin is extruded through the gap of the flat die of the extruder at a temperature of 180-250 °C, the width of the die gap is 1.5mm, and then the stretching speed is 20m / min, and the stretching ratio is 1:100 , and then cooled by a cooling roll, the temperature of the cooling roll is 100° C., and the cooled film is annealed at a temperature of 120° C. for 20 minutes to obtain a hard elastic polypropylene film with an elastic recovery rate of 95%.

Embodiment 2

[0012] The isotacticity is ≥96%, the density is 0.9±0.05g / cm 3 The extrusion grade polypropylene resin is extruded through the gap of the flat die of the extruder at a temperature of 180-250 °C, the width of the die gap is 1.8mm, and then stretched, the stretching speed is 20m / min, and the stretching ratio is 1:150, then cooled by a cooling roll, the temperature of the cooling roll is 80°C, and the cooled film is annealed at a temperature of 125°C for 20min to obtain a hard elastic polypropylene film with an elastic recovery rate of 96%.

Embodiment 3

[0014] The isotacticity is ≥96%, the density is 0.9±0.05g / cm 3 The extrusion grade polypropylene resin is extruded through the gap of the flat die of the extruder at a temperature of 180-250 ° C, the width of the die gap is 2.0 mm, and then stretched by the drafting roller at a stretching speed of 20 m / min. The stretch ratio is 1:200, and then cooled by a cooling roll, the temperature of the cooling roll is 45°C, and the cooled film is annealed at a temperature of 125°C for 5 minutes to obtain a hard elastic polypropylene film with an elastic recovery rate of 97%.

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Abstract

The invention relates to a preparation method of hard elastic polypropylene film and is characterized in that the method includes the following steps: extrusion grade polypropylene resin with the degree of isotacticity more than or equal to 96% and density of 0.9 plus or minus 0.05g / cm<3> is extruded by flat die gap of an extruder at the temperature of 180-250 DEG C, the width of die gap is 1.5-3.0mm, then the resin is drawn by a drawing roller at drawing speed of 20-40m / min and drawing ratio of 1:100-300, then the film is cooled by a cooling roller and the temperature of the cooling roller is 30-110 DEG C, and the cooled thin film is annealed at 120-150 DEG C for 5-60min. The hard elastic polypropylene film prepared by the preparation method of the invention has high recovery rate, and the recovery rate can reach more than 95%.

Description

(1) Technical field [0001] The invention relates to a preparation method of a hard elastic polypropylene film, which belongs to the technical field of polymer chemistry. (2) Background technology [0002] The microporous membrane is located between the positive and negative electrodes of the lithium-ion battery and is an important part of the lithium-ion battery. The main function of the microporous membrane is to isolate the positive and negative electrodes of the battery, so that the electrons in the battery cannot pass through freely; but it can allow the ions in the electrolyte to pass freely between the positive and negative electrodes. [0003] Polypropylene can be extruded at high speed followed by heat treatment at appropriate temperature to obtain a hard elastic material. To obtain a polymer material with hard elasticity, the key is to make the polymer molecular chain highly oriented, and then heat treatment to obtain a lamellar structure (row lamellar structure) t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/02B29C47/92B29C71/02B29L7/00B29K23/00B29C48/92
CPCB29C48/08B29C48/92B29C2948/9258B29C2948/92704B29C2948/92895B29C2948/92923B29C2948/92933
Inventor 单卫忠薛志刚薛峰
Owner JIANGSU SHENLONG VENTURE GROUP
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