Preparation method of polyolefin microporous film

A technology of polyolefin microporous membrane and polypropylene, which is applied in the direction of flat products, applications, coatings, etc., can solve the problems of poor uniformity of microporous membrane pores, complicated preparation process, and low production rate, and achieve uniform pores and low equipment investment. Small, high production rate effect

Active Publication Date: 2010-04-21
CANGZHOU MINGZHU SEPARATOR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, solve the existing problems of complex preparation process, low production rate, and poor uniformity of microporous membrane pores, provide a non-polluting environment, small equipment investment, high production rate, Preparation method of polyolefin microporous membrane with uniform micropores

Method used

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  • Preparation method of polyolefin microporous film

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Using polypropylene as raw material, its index is average molecular weight 300000, density 0.902g / cm 3 , melt index 3.0 g / 10 minutes. The specific process is:

[0019] A1. Casting to prepare the base film. Under the condition of 240 ° C, the raw material polypropylene is melted and extruded with a T-shaped casting head, the die opening is 1.2 mm, the temperature of the cooling roll is 30 ° C, and the drafting rate is 180 meters. / min to make a basement film;

[0020] B1, annealing treatment, put the base film prepared in step A1 into an oven for annealing treatment, the oven temperature is 150°C, and the annealing treatment time for the single-layer film is 15 minutes;

[0021] C1, multi-point stretching to form holes, the base film after the annealing treatment in step B1 is first cold-drawn at 20°C and a draw ratio of 350% / min to form silver streak defects, and then at a temperature of 145°C and 150 % / min under the stretching ratio of multi-point stretching to form...

Embodiment 2

[0024] Using polyethylene as raw material, its index is the average molecular weight of 200,000 and the density of 0.964g / cm 3 , High-density polyethylene with a melt index of 0.4 g / 10 minutes. The specific process is:

[0025] A2. Casting to prepare the base film. Under the condition of 200 ° C, the raw material polyethylene is melted and extruded with a T-shaped casting head, the die opening is 1.2 mm, the temperature of the cooling roll is 25 ° C, and the drafting speed is 180 meters. / min to make a basement film;

[0026] B2, annealing treatment, put the base film prepared in step A into an oven for annealing treatment, the temperature of the oven is 90°C, and the annealing treatment time for the single-layer film is 2 hours;

[0027] C2, multi-point stretching to form holes, the base film after the annealing treatment in step B is first cold-drawn at 28°C and a stretching ratio of 400% / min to form silver streak defects, and then at a temperature of 105°C and 150 % / min ...

Embodiment 3

[0030] Using polypropylene as raw material, its index is the average molecular weight of 300,000 and the density of 0.902g / cm 3 , melt index 3.0 g / 10 minutes.

[0031] The specific process is:

[0032] A3. Casting to prepare the base film, the raw material polypropylene is melted and extruded on a casting machine under the condition of 230° C., the die gap is 1.2 mm, the temperature of the cooling roll is 30° C., and the drawing speed is 180 m / min. Make basement membrane;

[0033] B3, annealing treatment, put the base film prepared in step A1 into an oven for annealing treatment, and anneal at 90°C, 105°C, and 120°C for 30 minutes;

[0034] C3, multi-point stretching to form holes, the base film after the annealing treatment in step B1 is first cold-drawn at 23°C and a stretching ratio of 400% / min to form silver streak defects, and then at a temperature of 140°C and Multi-point stretching at a stretching ratio of 150% / min to form a microporous structure;

[0035] D3, heat ...

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Abstract

The invention relates to a preparation method of a polyolefin microporous film, aiming to solve the problems that the traditional preparation method of the polyolefin microporous film has complicated process, low production speed and poorer uniformity of microporous space. A polyolefin microporous film product is prepared by the following steps: a. base film preparation by casting; b. multi-stage annealing processing; c. hole forming by multipoint stretching; and d. heat setting processing. The method does not need solvent, has no pollution to the environment, low equipment investment, high production speed and uniform microporous space, and is suitable for preparing various polyolefin microporous films used for poromeric materials, ultra filtration, film filtration, super capacitors, battery diaphragm materials and the like.

Description

technical field [0001] The invention relates to a preparation method of polyolefin microporous membrane. Background technique [0002] Polyolefin microporous membrane is a polymer membrane, which is a porous membrane with a pore size between 5nm and 1000nm. Single-layer polyolefin microporous membranes are used in breathable materials such as diapers, medical dressings, clothing linings, liquid separation, super Filtration and membrane filtration, as well as supercapacitor and battery separator materials. With the increasing development and wide application of polymer products, the technical requirements for polymer polyolefin microporous membranes used in polymer products, especially gas permeable materials, ultrafiltration, membrane filtration, supercapacitors and battery diaphragm materials are also getting higher and higher. . In the known technology, the existing polyolefin microporous membrane preparation methods mainly include dry method (melt stretching method) and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/02B29C41/24B29C41/52B29C71/02B29C55/02B29L7/00B29K23/00
Inventor 谷传明徐长城牛树章赵静
Owner CANGZHOU MINGZHU SEPARATOR TECH CO LTD
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