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Polypropylene composition for preparing polypropylene microporous membrane and preparation method of polypropylene composition

A polypropylene composition and polypropylene microporous membrane technology, applied in the field of preparation of the polypropylene composition, can solve the problems of difficult control of pore size and porosity, low product quality, influence on the industrialization process of lithium-ion battery separators, and the like, Achieve excellent tensile strength and puncture resistance, improve molding performance, and be suitable for mass production

Inactive Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical and mechanical properties are excellent, and the dry stretching process is relatively simple and pollution-free. It is a common method for the preparation of lithium-ion battery separators, but the pore size and porosity are difficult to control in this process, and the stretching ratio is small, only about 1~ 3. At the same time, it is easy to cause diaphragm perforation when stretching at low temperature, and the product cannot be made very thin
[0005] The dry biaxial stretching process technology is completely developed domestically and has been widely used in the market. However, there is no special material for diaphragm development and supply in the market, which makes it difficult to control the thickness uniformity of the film produced by this process. The production rate of stretched separators is low, and the problem of low product quality is more prominent, which affects the industrialization process of domestic lithium-ion battery separators

Method used

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  • Polypropylene composition for preparing polypropylene microporous membrane and preparation method of polypropylene composition
  • Polypropylene composition for preparing polypropylene microporous membrane and preparation method of polypropylene composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 90 parts of homopolypropylene A powder (weight average molecular weight 301,000, isotactic index 96.0%) and 10 parts homopolypropylene B powder (weight average molecular weight 52,000, isotactic index 97.9%)) , 5 parts of polypropylene wax, 0.1 part of N'N-dicyclohexyl terephthalamide, 0.5 part of nano-calcium carbonate, 0.05 part of antioxidant 1010 and 0.05 part of antioxidant 168 mixed with each other, adding Stir and mix in a high-speed mixer, the stirring speed is 400 rpm, and the stirring and mixing time is 15 minutes. After the mixing is completed, the material is discharged, and the premixed material is immediately added to a twin-screw extruder at a set temperature for melt mixing, extrusion and granulation to obtain a polypropylene composition. The set temperature of the twin-screw extruder is 180~250°C.

[0042] The prepared polypropylene composition is extruded through an extruder at 190-280°C to cast sheets, and stretched longitudinally and transversely in...

Embodiment 2

[0045] 60 parts of homopolypropylene A powder (weight average molecular weight 44.6, isotactic index 96.8%) and 40 parts of homopolypropylene B powder (weight average molecular weight 127,000, isotactic index 97.9%)), 0.5 parts of polypropylene wax, 0.5 parts of calcium suberate, 0.05 parts of antioxidant 1010 and 0.05 parts of antioxidant 168 are mixed together, then added to a high-speed mixer and stirred at a speed of 400 rpm , and the mixing time was 15 minutes. After the mixing is completed, the material is discharged, and the premixed material is immediately added to a twin-screw extruder at a set temperature for melt mixing, extrusion and granulation to obtain a polypropylene composition. The set temperature of the twin-screw extruder is 180~250°C.

[0046] The prepared polypropylene composition is extruded through an extruder at 190-280°C to cast sheets, and stretched longitudinally and transversely in sequence. The stretching temperature is 100-120°C, the stretching ...

Embodiment 3

[0049] 40 parts of homopolypropylene A powder (weight average molecular weight 650,000, isotactic index 97.5%) and 60 parts homopolypropylene B powder (weight average molecular weight 212,000, isotactic index 97.6%)) , 3 parts of polyethylene wax, 0.15 parts of zinc pimelate, 0.1 part of naphthalene dicyclohexylamide, 0.25 parts of nano-silica and 1 part of antioxidant 1010 are mixed with each other, then added to the high-speed mixer and stirred , the stirring speed is 400 rpm, and the mixing time is 15 minutes. After the mixing is completed, the material is discharged, and the premixed material is immediately added to a twin-screw extruder at a set temperature for melt mixing, extrusion and granulation to obtain a polypropylene composition. The set temperature of the twin-screw extruder is 180~250°C.

[0050] The prepared polypropylene composition is extruded through an extruder at 190-280°C to cast sheets, and stretched longitudinally and transversely in sequence. The stre...

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Abstract

The invention relates to a polypropylene composition for preparing a polypropylene microporous membrane. The melt flow rate of the polypropylene composition is 2.5-8.0g / 10min; the oxidation induction time is not lower than 10min; beta-crystal content (KDSC Kimmage Development Studies Centre) is not lower than 90%. The invention further relates to a preparation method for the polypropylene composition. The polypropylene composition provided by the invention improves the moulding processability of the microporous membrane effectively and particularly is suitable for the polypropylene microporous membrane formed by a dry-process dual-elongation technology. The microporous membrane obtained from the polypropylene composition provided by the invention has excellent air permeability, smaller thickness volatility, more excellent tensile strength and puncture resistance. The polypropylene composition can be applied to a lithium-ion battery separator and fields of an artificial kidney dialysis membrane, an artificial lung membrane, aseptic filtration and an aseptic packaging membrane, an air purification membrane, a gas separation membrane, a food preservation membrane, etc.

Description

technical field [0001] The invention relates to a polypropylene composition, in particular to a polypropylene composition for preparing a polypropylene microporous membrane, and also relates to a preparation method of the polypropylene composition. Background technique [0002] Polypropylene microporous membrane is a microporous membrane with an average pore size between 0.01 and 10 microns obtained by special molding methods based on polypropylene. Polypropylene microporous membrane has both the high-efficiency separation ability of functional membrane and the The excellent mechanical properties of the film can completely block various bacteria larger than 0.2~0.5μ and dust above 0.1μ, and even block some larger viruses. Therefore, it is widely used in medicine, batteries, air purification, food industry and even daily life. be widely used. [0003] The dry biaxial stretching process of polypropylene microporous film is to add a β crystal form modifier with nucleating effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/00C08L23/06C08K13/02C08K3/36C08K3/26C08K5/3437C08K5/098C08K5/20C08K5/3435B29B9/06B29C47/92B29C48/92
CPCC08L23/12B29B9/06C08L2203/16C08L2205/03C08L2205/242C08K13/02C08K2003/265C08K5/20C08K5/134C08K5/526C08K5/098C08L23/06C08K3/36C08K5/3437C08K5/3435
Inventor 左胜武傅勇邱敦瑞徐振明张宝强柯卓尚小杰
Owner CHINA PETROLEUM & CHEM CORP
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