Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 polymer microporous membrane to the art, so that it can solve the technical problems that the existing membrane-making process is relatively complicated and the efficiency is low.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Extrude polyethylene and polypropylene from extruder A and extruder B respectively, and compound them in a T-shaped 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 rotation speed is 22n / min, the barrel temperature is 150°C, the head temperature is 230°C, and the runner temperature is 240°C. The screw diameter of extruder B is 60mm, the aspect ratio is 35, the rotation speed is 25n / min, the barrel temperature is 200°C, the head temperature is 150°C, the runner temperature is 240°C, and the T-shaped die temperature is At 200°C, the number of polyethylene / polypropylene composite layers is four.

[0019] 2. The four-layer polyethylene / polypropylene composite sheet extruded through the die is cooled by the air knife, and the temperature of the air knife is 90°C.

[0020] 3. The four-layer polyethylene / polypropyle...

Embodiment 2

[0023] The experimental raw materials adopted are the same as in Example 1, and the screw diameter of the extruder A in Example 1 is changed to 50mm, the aspect ratio is changed to 25, the number of revolutions is changed to 25n / min, and the barrel temperature is changed to 200°C. The head temperature is changed to 230°C, and the runner temperature is changed to 190°C. The screw diameter of extruder B is changed to 20mm, the length-to-diameter ratio is changed to 30, the rotation speed is changed to 15n / min, the barrel temperature is changed to 150°C, the head temperature is changed to 200°C, and the runner temperature is changed to 230°C. The temperature of the T-shaped die is changed to 260°C, and the number of polyethylene / polypropylene composite layers is 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%.

Embodiment 3

[0025] Experimental raw materials and operations are the same as 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%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
The melt flow rateaaaaaaaaaa
Densityaaaaaaaaaa
The melt flow rateaaaaaaaaaa
Login to View More

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.

Description

technical field [0001] The invention relates to the field of battery diaphragms, and relates to a method for preparing a multilayer composite polymer microporous membrane suitable for lithium-ion battery diaphragms. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic products such as notebook computers and mobile phones. Compared with nickel-cadmium batteries and nickel-metal hydride batteries, lithium-ion batteries have the advantages of high energy density, long life and high voltage. The composition of lithium-ion batteries includes: lithium oxide positive electrode, carbon negative electrode, polymer separator and electrolyte. The polymer separator separates the positive electrode and negative electrode materials. It is an insulator of electrons, but allows ions to migrate through. As we all know, if a lithium battery is short-circuited or misconnected, an abnormal current will be generated inside it, which will cause a sharp ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M2/14H01M2/16B82Y30/00H01M10/0525H01M50/403H01M50/446
CPCB82Y30/00H01M10/0525H01M50/446H01M50/403H01M50/449Y02E60/10
Inventor 王岳明王冠杰王杰南
Owner 宁波科乐新材料有限公司
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com