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Polyolefin composition for preparing millipore membrane and preparation method thereof and millipore membrane prepared from polyolefin composition

A polyolefin and composition technology, applied in the field of microporous membranes, can solve the problems of low stretching rate and lower production efficiency, and achieve the effects of high relative dispersion, pollution avoidance, and low room temperature xylene soluble content

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A problem existing in the prior art is that in order to ensure sufficient porosity and ideal pore size, a relatively large amount of inorganic filler must be added. rate, you need to use a lower stretching rate, which greatly reduces production efficiency

Method used

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  • Polyolefin composition for preparing millipore membrane and preparation method thereof and millipore membrane prepared from polyolefin composition
  • Polyolefin composition for preparing millipore membrane and preparation method thereof and millipore membrane prepared from polyolefin composition
  • Polyolefin composition for preparing millipore membrane and preparation method thereof and millipore membrane prepared from polyolefin composition

Examples

Experimental program
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Effect test

Embodiment 1

[0077] 1. Modification of diatomite with silane coupling agent: Weigh a certain amount of silane coupling agent KH-550 (γ-aminopropyltriethoxysilane, industrial grade, Hubei New Blue Sky New Material Co., Ltd. ) was hydrolyzed in 95%wt ethanol solution for 1h until clarified to obtain a silane coupling agent hydrolyzate with a coupling agent concentration of 5wt%. Diatomite slurry with a concentration of 20%wt (a suspension formed of diatomite in water, diatomite is a diatomite product produced by Celite Company with a brand name of super floss, with a particle size range of 0.1-20 μm) is heated to 90°C, add silane coupling agent hydrolyzate, react for 2 hours and then filter with suction; then dry at 110°C for 2 hours; finally sieve to obtain modified diatomite.

[0078] 2. Preparation of polyolefin composition: take the above-mentioned modified propylene-butene-1 random copolymer and diatomaceous earth according to a weight ratio of 50 / 50, and fully mix them in a high-speed ...

Embodiment 2

[0092] Same as Example 1, except that the extruded film is biaxially stretched, the stretching rate is 7 times / second, and the transverse and longitudinal stretching ratios are 4 times at 150°C. No membrane rupture. The obtained microporous membrane has a thickness of 30 μm and a pore diameter ranging from 1 to 12 μm.

Embodiment 3

[0094] Same as Example 1, except that the propylene-butene-1 random copolymer is taken out according to the weight ratio of 40 / 60 with diatomaceous earth. No membrane rupture. The membrane thickness is 50 μm, and the pore size ranges from 1 to 20 μm.

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Abstract

The invention relates to a polyolefin composition for preparing a millipore membrane. The polyolefin composition contains a propylene-butene-1 random copolymer and diatomite which are co-mixed, wherein the weight ratio of the propylene-butene-1 random copolymer to the diatomite is 30:70 to 80:20. The content of butylene-1 in the propylene-butylene-1 random copolymer is 1-6 mol%, and preferably is 3-6 mol%; the butylene-1 relative dispersity determined according to a nuclear magnetic resonance method is more than 98.5%, and preferably is more than 99.0%; the particle size of the diatomite is in a range of 0.1-20 [mu]m. The preparation method comprises carrying out melt co-mixing of the components comprising the propylene-butene-1 random copolymer and the diatomite according to the amount to obtain the polyolefin composition. The polyolefin composition is used for preparing the millipore membrane, and can significantly improve the membrane-drawing speed under conditions without membrane rupture and of ensuring the porosity and the pore size.

Description

technical field [0001] The present invention relates to a polyolefin composition, more specifically, to a polyolefin composition for preparing a microporous membrane, a preparation method thereof and a microporous membrane prepared therefrom. Background technique [0002] Polymer microporous membrane products are widely used in battery separators, ultrafiltration, microfiltration, food preservation film, composite paper, enzyme-loaded reactors and other applications. Polyolefin resin has the characteristics of excellent mechanical properties, excellent corrosion resistance, electrical insulation, low density and low price. Therefore, the microporous membrane made of polyolefin resin also has the advantages of light weight, low price, excellent mechanical properties, solvent resistance, and chemical stability. Now many foreign companies have industrialized products of polymer microporous membranes. [0003] The blending and stretching method is a common method for preparing...

Claims

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Application Information

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IPC IPC(8): C08L23/14C08K9/06C08K3/34C08F210/06C08F210/08C08F4/649C08F4/646
CPCC08F210/06C08K3/34C08K2201/003C08L2203/16C08L23/14C08F4/6494
Inventor 刘宣伯郭梅芳张龙贵郭敏任毅高达利邹浩罗水源
Owner CHINA PETROLEUM & CHEM CORP
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