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Polyolefin microporous membrane and preparation method thereof

A polyolefin microporous film, polyolefin technology, applied in the field of polyolefin materials, can solve the problems of poor product performance uniformity, affecting product quality, uneven dispersion, etc. high intensity effect

Active Publication Date: 2012-08-29
乐凯胶片股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low dosage of these additives, if these small amounts of additives are directly mixed into these high-viscosity polyolefin resins, it is easy to cause uneven dispersion, resulting in poor product performance uniformity and directly affecting product quality.

Method used

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  • Polyolefin microporous membrane and preparation method thereof

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Experimental program
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preparation example Construction

[0034] The preparation process of the modified ultra-high molecular weight polyolefin masterbatch is as follows:

[0035] Add 40-70% ultra-high molecular weight polyethylene resin, 10-25% modified resin, 15-25% additive and 5-10% lubricant into the mixer, and mix at a temperature of 200-260°C into a blend, extruded and granulated by a screw extruder to obtain a modified ultra-high molecular weight polyolefin masterbatch.

[0036] In the preparation of non-porous slabs, in order to achieve the purpose of mixing the modified ultra-high molecular weight polyolefin masterbatch with high-density polyolefin resin and plasticizer, before entering the twin-screw extruder, the present invention uses pre-mixed In the method of stirring and mixing these raw materials, after mixing and dispersing evenly, they are added to the twin-screw extruder.

[0037] In the present invention, the above-mentioned temperature of mixing and dispersing the raw materials in the mixer is not particularly ...

Embodiment 1

[0045] 1. At a temperature of 240°C, 7 kg of ultra-high molecular weight polyethylene resin with a weight average molecular weight of 5 million, 1 kg of polyethylene resin with a molecular weight of 5000, tetra{β-(3,5-di-tert-butyl-4- Add 1.5 kg of hydroxyphenyl) propionate} pentaerythritol ester and 0.5 kg of magnesium stearate into a mixer, mix evenly, extrude and granulate through a screw extruder to obtain a modified ultra-high molecular weight polyolefin masterbatch.

[0046] 2. At room temperature, add 10 kg of modified ultra-high molecular weight polyolefin masterbatch and 20 kg of high-density polyolefin resin with a weight-average molecular weight of 200,000 to the mixer, and add it to the twin-screw extruder after being uniform. At the same time, 70 kg of liquid paraffin was added, melted at a temperature of 210° C., extruded through a die, and cooled and solidified by a cooling roll at 40° C. to obtain a non-porous thick sheet.

[0047] 3. Simultaneously biaxially s...

Embodiment 2

[0051] 1. At a temperature of 260°C, 9 kg of ultra-high molecular weight polyethylene resin with a weight average molecular weight of 4 million, 2 kg of polyethylene resin with a molecular weight of 5000, 1 kg of dioctyl phthalate, and dioctadecyl pentaerythritol Add 1.5 kilograms of bisphosphite and 1.5 kilograms of polyethylene wax into a mixer, mix uniformly, and then extrude and granulate through a screw extruder to obtain modified ultra-high molecular weight polyolefin masterbatches.

[0052] 2. At room temperature, add 15 kg of modified ultra-high molecular weight polyolefin masterbatch and 30 kg of high-density polyolefin resin with a weight-average molecular weight of 800,000 into the mixer, and add it to the twin-screw extruder after being uniform. At the same time, 55 kg of liquid paraffin was added, melted at a temperature of 230° C., extruded through a die, and cooled and solidified by a cooling roll at 30° C. to obtain a non-porous thick sheet.

[0053] 3. Simulta...

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Abstract

The invention relates to a polyolefin microporous membrane and a preparation method thereof. The polyolefin microporous membrane is composed of a modified superhigh molecular weight polyolefin master grain and high-density polyolefin, wherein the modified superhigh molecular weight polyolefin master grain is composed of the following components by weight percent: 40-70% of superhigh molecular weight polyethylene resins, 10-25% of modified resins, 15-25% of additives and 5-10% of lubricants. The quantity of crystal points of the polyolefin microporous membrane provided by the invention is reduced; the tensile strength is high; the homogeneity of product property is excellent; the method is simple in process; and the prepared polyolefin microporous membrane product has a suitable pore size,excellent ventilating property, a low-temperature disconnecting function and excellent mechanical property.

Description

technical field [0001] The invention relates to polyolefin materials, in particular to a polyolefin microporous membrane and a preparation method thereof. Background technique [0002] Polyolefin microporous membrane is a porous membrane with a polymer membrane and a pore size between 5nm and 1000nm. Polyolefin microporous membranes are used in various applications such as battery separators and capacitor separators, especially when they are used as lithium-ion battery separators, and their performance greatly affects battery characteristics, production efficiency, and safety. [0003] Early polyolefin microporous membranes were prepared from a single high molecular weight polyethylene (500,000-1 million), which has a suitable pore size and closed-cell function, but has the disadvantage of insufficient puncture strength. Later, in order to improve the puncture strength of the polyolefin microporous membrane, so that the polyethylene microporous membrane not only has the fun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K5/01B29C69/02B29B9/06
Inventor 宋红芹千昌富韩继庆张永升高敬宇
Owner 乐凯胶片股份有限公司
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