A method for evaluating ultra-high molecular weight polyethylene resin with online rheometer

A technology of ultra-high molecular weight and polyethylene resin, applied in the direction of DC flow characteristics measurement, etc., can solve problems such as unsatisfactory, incompletely consistent states, and inability to truly reflect the rheological properties of polymer melts, and achieve accurate and effective results. Good and efficient effect

Active Publication Date: 2021-11-12
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of the off-line rheometer, the test results are not completely consistent with the actual production state, and cannot truly reflect the rheological properties of the polymer melt during processing, and cannot meet the actual processing needs. Therefore, On-line rheometer has been more and more widely used
[0004] At present, there is no systematic correspondence between the processing performance of ultra-high molecular weight polyethylene lithium battery separators or fiber-specific resins and film-forming or spinnability. Enterprises often adjust process parameters through experience

Method used

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  • A method for evaluating ultra-high molecular weight polyethylene resin with online rheometer
  • A method for evaluating ultra-high molecular weight polyethylene resin with online rheometer
  • A method for evaluating ultra-high molecular weight polyethylene resin with online rheometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Get two kinds of ultra-high-molecular-weight polyethylene resins with different performance characteristics, numbering 1#, 2#, dissolve them in paraffin oil respectively, add antioxidant 168, and the mass concentration is 0.1wt.%, to form a semi-dilute solution (ultra-high molecular weight The concentration of polyethylene is 20wt.%). After feeding the obtained semi-dilute solution into the twin-screw extruder, open the pressure closed-loop control system to provide a stable extrusion pressure, and open the side channel between the extruder melt pump and die The melt enters the capillary rheometer at a constant pressure, and is extruded through the die of the capillary rheometer, and the obtained online rheological parameters (test results such as figure 1 As shown, the k value represents the slope of the straight line) to regulate its processing technology, then cast or calender to form a nascent film, and finally judge the film-forming performance by thermally induced ...

Embodiment 2

[0048] Get ultra-high molecular weight polyethylene resins with different performance characteristics, numbering 3#, 4#, 5#, dissolve them in paraffin oil respectively, add antioxidant 1076, and the concentration is 0.1wt.%, to form a semi-dilute solution (ultrahigh Molecular weight polyethylene concentration is 20wt.%), after feeding the obtained semi-dilute solution into the twin-screw extruder, open the pressure closed-loop control system to provide a stable extrusion pressure, and open the side path between the extruder melt pump and the mouth The valve between the molds, the melt enters the capillary rheometer at a constant pressure, and is extruded through the die of the capillary rheometer, and the obtained online rheological parameters (test results such as figure 2 As shown, the k value represents the slope of the straight line) to regulate its processing technology, then cast or calender to form a nascent film, and finally judge the film-forming performance by therma...

Embodiment 3

[0053] Get ultra-high molecular weight polyethylene resin, number 6#, dissolve in paraffin oil respectively, add antioxidant 1076, concentration is 0.1wt.%, form semi-dilute solution (concentration of ultra-high molecular weight polyethylene is 20wt.%), After feeding the obtained semi-dilute solution into the twin-screw extruder at different processing temperatures, open the pressure closed-loop control system to provide stable extrusion pressure, open the side channel between the extruder melt pump and the die valve, the melt enters the capillary rheometer at a constant pressure, is extruded through the die of the capillary rheometer, and passes through the online rheological parameters obtained (test results such as image 3 As shown, the k value represents the slope of the straight line) to regulate its processing technology, then cast or calender to form a nascent film, and finally judge the film-forming performance by thermally induced phase separation and biaxial stretchi...

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Abstract

The invention relates to a method for evaluating ultra-high molecular weight polyethylene resin with an online rheometer. The method analyzes the online viscosity of the ultra-high molecular weight polyethylene resin, and then prepares a lithium battery by thermally induced phase separation and biaxial stretching technology Separators or fibers prepared by extraction, drying and multi-stage stretching, and their properties are analyzed to obtain the corresponding relationship between the online viscosity of the resin, the film-forming performance of the separator, and the spinnability of the fibers. Therefore, the film-forming properties and spinnability of ultra-high molecular weight polyethylene can be judged by the online viscosity of the resin. Compared with the prior art, the present invention has the advantages of simple method, good effect and the like.

Description

technical field [0001] The invention relates to the field of polymer material molding and processing, in particular to a method for evaluating and preparing ultra-high molecular weight polyethylene resin for lithium battery separators or fibers by using an online rheometer. Background technique [0002] Due to its long molecular chain and high molecular weight, ultra-high molecular weight polyethylene (UHMWPE) has excellent mechanical properties, wear resistance and chemical corrosion resistance that other materials cannot match. As a high-end product in the lithium battery separator, UHMWPE diaphragm has excellent comprehensive performance, especially its melt is gelatinous at high temperature, melts without collapsing, and has excellent resistance to short circuit and explosion that may occur when overcharging or high temperature Safety protection is the preferred raw material for power lithium battery separator materials. [0003] Rheology is the viscous and elastic defo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/04
CPCG01N11/04
Inventor 茆汉军张玉梅王新威徐迅孙勇飞
Owner SHANGHAI RES INST OF CHEM IND
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