A method for quantitative determination of entanglement degree of ultra-high molecular weight polyethylene resin

A technology of ultra-high molecular weight and polyethylene resin, applied in the preparation of test samples, measuring devices, and analysis materials, etc., can solve the problems of complex implementation steps and large errors, and achieve high-efficiency evaluation standards, reliable data, and simple methods Effect

Active Publication Date: 2021-10-08
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a simple and efficient method for quantitatively measuring the degree of entanglement of UHMWPE resin in order to overcome the complex implementation steps and large errors in the above-mentioned prior art

Method used

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  • A method for quantitative determination of entanglement degree of ultra-high molecular weight polyethylene resin
  • A method for quantitative determination of entanglement degree of ultra-high molecular weight polyethylene resin
  • A method for quantitative determination of entanglement degree of ultra-high molecular weight polyethylene resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 1# UHMWPE (viscosity average molecular weight is 0.5×10 6 g / mol) resin 3g, get 27g paraffin oil as solvent, add antioxidant 168, mass concentration is 1wt.%, UHMWPE powder, paraffin oil, antioxidant are added in the measuring cup, form semi-dilute solution (UHMWPE concentration is 10wt. .%), using an anti-settling design stirring paddle, setting the stirring rate to 100rpm / min, rapidly raising the temperature to 200°C at a heating rate of 50°C / min, and obtaining the change curve of the viscosity of the system with time at a constant temperature of 200°C, as figure 1 Shown, (η max -η eq ) / η max The ratio of is 0.146, so as to quantitatively measure the degree of entanglement of 1# UHMWPE resin itself.

Embodiment 2

[0030] Take 2#UHMWPE (viscosity average molecular weight is 1.5×106 g / mol) resin 3g, get 27g paraffin oil as solvent, add antioxidant 168, mass concentration is 1wt.%, UHMWPE powder, paraffin oil, antioxidant are added in the measuring cup, form semi-dilute solution (UHMWPE concentration is 10wt. .%), using an anti-settling design stirring paddle, setting the stirring rate to 100rpm / min, rapidly raising the temperature to 200°C at a heating rate of 50°C / min, and obtaining the change curve of the viscosity of the system with time at a constant temperature of 200°C, as figure 2 Shown, (η max -η eq ) / η max The ratio of is 0.162, so as to quantitatively measure the degree of entanglement of 2# UHMWPE resin itself.

Embodiment 3

[0032] Take 3# UHMWPE (viscosity-average molecular weight is 4×10 6 g / mol) resin 0.3g, get 29.7g paraffin oil as solvent, add antioxidant 1010, mass concentration is 1wt.%, UHMWPE powder, paraffin oil, antioxidant are added in the measuring cup, form semi-dilute solution (UHMWPE concentration 1wt.%), set the stirring rate as 400 rpm / min, rapidly heat up to 200°C at a heating rate of 80°C / min, and obtain the change curve of the viscosity of the system with time at a constant temperature of 200°C, as image 3 Shown, (η max -η eq ) / η max The ratio of is 0.296, so as to quantitatively measure the degree of entanglement of 3# UHMWPE resin itself.

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Abstract

The invention relates to a method for quantitatively measuring the degree of entanglement of ultra-high molecular weight polyethylene resin. The ultra-high molecular weight polyethylene resin to be tested is mixed with a solvent and stirred to obtain a mixed slurry, and the temperature is rapidly raised to a temperature above the melting point of the ultra-high molecular weight polyethylene resin. Lower constant temperature treatment for a period of time, obtain the change curve of viscosity with time, pass in the viscosity change curve (η max ‑η eq ) / η max The value of is a quantitative measure of the degree of entanglement of UHMWPE resins. Compared with the prior art, the invention quickly and simply quantitatively characterizes the molecular chain entanglement degree of the ultra-high molecular weight polyethylene resin, and solves the problems of complicated implementation steps and large errors in the prior art.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a method for quantitatively measuring the entanglement degree of ultra-high molecular weight polyethylene resin. Background technique [0002] In recent years, the processing of ultra-high molecular weight polyethylene (UHMWPE) resin and small molecule solvent has been widely used in the field of high-strength fibers and lithium battery separators. After the wire sheet is stretched and the solvent is extracted, a lithium battery separator or fiber is prepared. Due to the macromolecular entanglement structure of UHMWPE, it is very difficult to dissolve it. If it is only melted under the action of heat, the molecular chain movement is slow and easy to degrade, and the processing performance is poor. It is necessary to add a low molecular weight plasticizer to improve its solubility. Melt fluidity. The preparation of uniform UHMWPE solution has become an important link in the enti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/00G01N1/38G01N1/44
CPCG01N1/38G01N1/44G01N11/00G01N2001/386
Inventor 茆汉军徐迅张玉梅王新威张文阳郭建双
Owner SHANGHAI RES INST OF CHEM IND
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