Preparation method of multilayer compound polymer micro-porous film

A composite polymer and multi-layer composite technology, which is applied in nanotechnology, electrical components, electrochemical generators, etc. for materials and surface science, can solve problems such as low efficiency and complex film-making process, and achieve high efficiency, Simple preparation process and excellent performance

Inactive Publication Date: 2017-06-13
宁波科乐新材料有限公司
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AI-Extracted Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned deficiencies, the purpose of the present invention is to provide a kind of preparation method of multi-layer composite polyme...
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Abstract

The invention relates to a preparation method of a multilayer compound polymer micro-porous film in the field of battery diaphragms. The method comprises the following steps: a, melting and extruding polyethylene and polypropylene respectively through an extruder, wherein the flowing rate of polyethylene melt is 0.1-2g per/10min, the density of the polyethylene melt is 0.95-0.964g/cm<3>, the flowing rate of the polypropylene melt is 0.2-2.5g/10min, the polyethylene melt and the polypropylene melt are compounded in a T-shaped neck mould to form 2-5 layers of compound sheets with thickness of 1.5-4.5mm; b, carrying out wind blade cooling on the compound sheets in the step a at the temperature of 50-100 DEG C; c, drawing the compound sheets in the step b through a film winding machine to obtain a polyolefin film; and d, annealing the polyolefin film, drawing the polyolefin film in one direction, and shaping to obtain the multilayer compound polymer micro-porous film with a micro-porous structure. The preparation method of the multilayer compound polymer micro-porous film is simple and is high in efficiency; and the prepared micro-porous film is excellent in performance.

Application Domain

Material nanotechnologySecondary cells +1

Technology Topic

PolypropylenePolyolefin +6

Examples

  • Experimental program(5)

Example Embodiment

[0017] Example 1
[0018] 1. Extrude polyethylene and polypropylene from extruder A and extruder B respectively, and compound them in a T-die. The melt flow rate of polyethylene is 0.1g/10min, and the density is 0.96g/cm. 3 , the melt flow rate of polypropylene is 2.0g/10min. The screw diameter of extruder A is 40mm, the aspect ratio is 30, the number of revolutions is 22n/min, the barrel temperature is 150°C, the die temperature is 230°C, and the flow channel temperature is 240°C. The screw diameter of extruder B is 60mm, the length-diameter ratio is 35, the number of revolutions is 25n/min, the temperature of the barrel is 200℃, the temperature of the die head is 150℃, the temperature of the runner is 240℃, and the temperature of the T-shaped die is At 200°C, the number of polyethylene/polypropylene composite layers is four.
[0019] 2. The four-layer polyethylene/polypropylene composite sheet extruded through a die is cooled by an air knife, and the air knife temperature is 90°C.
[0020] 3. The four-layer polyethylene/polypropylene composite film is drawn through a film winding machine to obtain a polyolefin film;
[0021] 4. The polyolefin film is annealed and uniaxially stretched. Both polyethylene and polypropylene are crystalline polymers. After the polymer film is uniaxially stretched in the longitudinal direction, the lamellae are separated and a large number of microfibers appear, resulting in A network structure of slit-like voids, that is, a large number of micropores, can be heated to obtain a multi-layer polyethylene/polypropylene composite microporous membrane with a microporous structure. The thickness of the prepared polyethylene/polypropylene composite microporous membrane is 20 μm, the average size of the micropores is 20 nm, and the porosity of the composite microporous membrane is 20%.

Example Embodiment

[0022] Example 2
[0023] The experimental raw materials used were the same as those in Example 1. The screw diameter of the extruder A in Example 1 was changed to 50 mm, the aspect ratio was changed to 25, the number of revolutions was changed to 25 n/min, and the temperature of the barrel was changed to 200 ° C. The head temperature was changed to 230°C, and the runner temperature was changed to 190°C. The screw diameter of extruder B was changed to 20mm, the aspect ratio was changed to 30, the number of revolutions was changed to 15n/min, the barrel temperature was changed to 150°C, the head temperature was changed to 200°C, and the runner temperature was changed to 230°C. The temperature of the T-die was changed to 260°C, and the number of polyethylene/polypropylene composite layers was two. The thickness of the prepared polyethylene/polypropylene composite microporous membrane is 10 μm, the average size of the micropores is 50 nm, and the porosity of the composite microporous membrane is 50%.

Example Embodiment

[0024] Example 3
[0025] The experimental raw materials and operations are the same as those in Example 1, and the number of polyethylene/polypropylene composite layers is adjusted to five layers. The thickness of the prepared polyethylene/polypropylene composite microporous membrane is 40 μm, the average size of the micropores is 38 nm, and the porosity of the composite microporous membrane is 60%.

PUM

PropertyMeasurementUnit
The melt flow rate0.1 ~ 2.0g/10min
Density0.95 ~ 0.964g/cm³
The melt flow rate0.2 ~ 2.5g/10min

Description & Claims & Application Information

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