High-strength polyethylene microporous film and preparation method and application thereof

A high-strength polyethylene, microporous membrane technology, applied in separation methods, chemical instruments and methods, membranes, etc., can solve the problems of shortened service life, low strength, limitations, etc., to solve the problems of shortened service life, wide application range, Long service life effect

Active Publication Date: 2018-09-14
QINGDAO LANKETU MEMBRANE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the patent application CN102512875A proposes a method for preparing an ultra-high molecular weight polyethylene filter material, which uses a sintering method to press the ultra-high molecular weight polyethylene powder together. Due to the lack of biaxial stretching, a larger tensile strength cannot be achieved. Tensile strength; patent application CN107283976A proposes a preparation method of microporous polyethylene gas-permeable membrane, but this method limits its application due to the residue of pore-forming agent
Therefore, how to solve the problem of shortened service life of microporous membrane materials on the market due to low strength will be an important topic of current research in this field.

Method used

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  • High-strength polyethylene microporous film and preparation method and application thereof
  • High-strength polyethylene microporous film and preparation method and application thereof
  • High-strength polyethylene microporous film and preparation method and application thereof

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preparation example Construction

[0026] The embodiment of the present invention provides a method for preparing a high-strength polyethylene microporous membrane, comprising the following steps:

[0027] S1: The polyethylene B and the reaction solvent are mixed in proportion and injected into the reaction vessel for high temperature swelling.

[0028] S2: The polyethylene A and the mixed solution after high temperature swelling are mixed in proportion and then melted to obtain a high temperature melt. The high temperature melt is filtered and metered, pumped into a flat die, and cooled to obtain an oil-containing cast sheet.

[0029] In this step, the polyethylene and the mixed solvent are mutually dissolved at high temperature to form a homogeneous solution, and then heated to phase separation during the cooling process, so that the components in the obtained oil-containing cast sheet can be evenly distributed.

[0030] S3: preheating the oil-containing cast slab and performing high-temperature bidirectional...

Embodiment 1

[0048] Raw materials: polyethylene A has a viscosity-average molecular weight of 1 million, polyethylene B has a viscosity-average molecular weight of 2.3 million, and the reaction solvent is 50# paraffin oil.

[0049] Mix polyethylene B and paraffin oil at a mass ratio of 1:19 and inject it into the swelling tank for high temperature swelling, then mix polyethylene A and high temperature swollen solution according to the mass ratio of polyethylene A and polyethylene B to the mass ratio of the reaction solvent After mixing 3:7, pour it into twin-screws with a diameter of 120mm and an aspect ratio of 52, and melt at a screw speed of 80r / min to obtain a high-temperature melt with a maximum temperature of 220°C. The high-temperature melt is filtered and metered and then pumped into the In the flat die, it flows out through the slit of the die, and then is cooled and formed by a cooling roll at 30°C to obtain an oil-containing cast sheet;

[0050] Preheat the oil-containing cast s...

Embodiment 2

[0055] Preparation method is the same as implementation 1, the difference is:

[0056] The mass ratio of polyethylene B to paraffin oil is 1:9, and the ratio of the total mass of polyethylene A and polyethylene B to the solvent mass is 1:3.

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Abstract

The invention provides high-strength polyethylene microporous film and a preparation method and application thereof, belongs to the field of film materials and can solve the problem that microporous film in the market has shorter life due to low strength. The preparation method according to the technical scheme includes: proportionally mixing polyethylene B and a reaction solvent, injecting the mixture into a reaction container, and carrying out high-temperature swelling; proportionally mixing polyethylene A and the mixture subjected to high-temperature swelling, melting the resultant to obtain high-temperature melt, filtering and metering the high-temperature melt, pumping the melt into a plate mold head, cooling to obtain an oil-bearing casting; subjecting the oil-bearing casting to primary bidirectional drawing, performing extracting, and performing secondary bidirectional drawing to obtain polyethylene film; rolling the thermally treated polyethylene film to obtain the high-densitypolyethylene microporous film. The invention applies to the preparation of high-strength polyethylene microporous film.

Description

technical field [0001] The invention belongs to the field of film materials, and in particular relates to a high-strength polyethylene microporous film, its preparation method and its application. Background technique [0002] Membrane is a material with selective separation function. The selective separation of membrane is used to realize the separation, purification, concentration and other processes of different components of feed liquid. The difference between membrane separation and traditional filtration is that the membrane can separate in the molecular range, and it is a physical process that does not require phase changes and additives. Polymer membrane separation technology has been widely used in industrial, agricultural and domestic sewage treatment, air purification, water resource regeneration and other fields due to its advantages of high efficiency and low energy consumption. The core component of membrane separation technology is the microporous separation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D69/02B01D67/00B01D53/22
CPCB01D53/228B01D67/0016B01D69/02B01D71/26B01D2325/24
Inventor 郅立鹏陈继朝徐阳厉勇杨波吕展飞徐宾
Owner QINGDAO LANKETU MEMBRANE MATERIALS CO LTD
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