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Method for preparing porous film by adopting high molecular weight polyolefin and product and application thereof

A high molecular weight, porous film technology, applied in the direction of electrical components, circuits, battery components, etc., can solve the problems that cannot meet the requirements of power lithium-ion batteries, the distribution of porous film pores, poor pore structure, mechanical properties, high temperature, etc. Low puncture strength and other problems, to achieve the effect of thermal shutdown characteristics and thermal dimensional stability, low cost, high temperature puncture strength

Active Publication Date: 2011-08-17
LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is relatively complex and costly. The weight average molecular weight of the polyethylene raw material used in the preparation is generally 100,000 to 200,000 g / mol, and the molecular weight distribution is 25 to 40. Due to the small molecular weight, the molecular weight distribution is relatively wide. , the prepared porous film has poor pore distribution and pore structure, low mechanical properties and high-temperature puncture strength, and cannot meet the requirements of power lithium-ion batteries. At the same time, the porous film material prepared by this method has a low fusing temperature. The high temperature use of the battery has certain hazards

Method used

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  • Method for preparing porous film by adopting high molecular weight polyolefin and product and application thereof
  • Method for preparing porous film by adopting high molecular weight polyolefin and product and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] ①Take the high molecular weight polyolefin A with a weight average molecular weight of 500,000 g / mol and a molecular weight distribution (Mw / Mn) of 10 and the high molecular weight polyolefin B with a weight average molecular weight of 2 million g / mol and a molecular weight distribution of 20 at a ratio of 2:1 Mix together to obtain high molecular weight polyolefin raw materials, then take 1 part of non-polar solvent white mineral oil in parts by weight and soak 9 parts of high molecular weight polyolefin raw materials at a temperature of 50 °C for 6 hours;

[0033] ② Take 100 parts by weight of high molecular weight polyolefin after soaking treatment, mix with 1 part of anti-adhesive agent ABPP05 and 1 part of antioxidant 1010, and mix them in a single-screw extrusion equipment at an extrusion temperature of 230 ° C to prepare co- masterbatch;

[0034] ③On the cast film unit, under the condition of casting sheet temperature of 25°C, the masterbatch is stretched by biax...

Embodiment 2

[0037] Repeat the operation of embodiment 1, the difference is:

[0038] In step ①, the high-molecular-weight polyolefin raw material is only polyolefin A, the non-polar solvent is white mineral oil and paraffin oil mixed in a weight ratio of 1:1, and the weight ratio of the non-polar solvent to the high-molecular-weight polyolefin raw material is 1 : 4. The immersion temperature is 70°C, and the immersion time is 10h; in step ②, 100 parts by weight of soaked high molecular weight polyolefin, 1 part of anti-adhesive agent ABPP05 and 2 parts of antioxidant 1010 are mixed, and passed through double The screw extruder is mixed to prepare the blend masterbatch; in step ③, the longitudinal stretching temperature is 90°C, the longitudinal stretching ratio is 3 times, the transverse stretching temperature is 150°C, and the transverse stretching ratio is 5 times, and the obtained film material The thickness is 40um; in step ④, the non-polar solvent is xylene, the extraction temperatur...

Embodiment 3

[0040] Repeat the operation of embodiment 1, the difference is:

[0041] In step ①, in the high molecular weight polyolefin raw material, the weight ratio of polyolefin A to polyolefin B is 7:1, the non-polar solvent is mixed with xylene and paraffin oil in a weight ratio of 1:1, and the non-polar solvent and The weight ratio of high-molecular-weight polyolefin raw materials is 1:4, the soaking temperature is 90°C, and the soaking time is 14 hours; in step ②, 100 parts by weight of soaked high-molecular-weight polyolefin are taken, 2 parts of anti-adhesive agent ABPP05 and 1 part of antioxidant 1010 is mixed and mixed by an internal mixer to form a blend masterbatch; in step ③, the longitudinal stretching temperature is 100°C, the longitudinal stretching ratio is 4 times, the transverse stretching temperature is 150°C, and the transverse stretching temperature is 150°C. The ratio is 6 times, and the thickness of the obtained film material is 33um; in step ④, the non-polar solv...

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Abstract

The invention discloses a method for preparing a porous film by adopting high molecular weight polyolefin. The method comprises the following steps of: (1) performing soaking treatment on the high molecular weight polyolefin; (2) blending the soaked high molecular weight polyolefin and materials such as thermoplastic resin, auxiliary agent and the like to prepare blended master batch; (3) preparing the obtained blended master batch into a film material; and (4) extracting the film material to obtain the porous film. The porous film has the characteristics of high mechanical strength, high porosity, uniform aperture size, high ion permeability, excellent dielectric property and the like, can be used as a lithium ion battery diaphragm, and has better safety; and the method has simple process and easily controlled conditions, is suitable for mechanized large-scale production, and has low cost and high efficiency.

Description

technical field [0001] The invention relates to the field of film technology, in particular to a method for preparing a porous film from high molecular weight polyolefin, and also relates to the porous film obtained by the method and the application of the porous film. Background technique [0002] During the production and use of lithium-ion batteries, in order to avoid battery explosion caused by short-circuiting the positive and negative electrodes of the battery, a porous thin film material must be used as a separator in the middle, which can provide ion channels for lithium ions in the battery and improve The cycle charge and discharge time of the lithium-ion battery can increase the specific capacity of the lithium-ion battery at the same time, and play a role in protecting the safe use of the lithium-ion battery. Its performance determines the interface structure and internal resistance of the battery. Separator materials used in batteries need to have excellent mecha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28B29C55/12C08L23/12C08L23/06C08L23/08C08L23/14C08L23/16H01M2/16
CPCY02E60/12Y02E60/10
Inventor 沈勇
Owner LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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