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Quick determination method for methyl content in polyethylene copolymer

A polyethylene copolymer, a rapid determination technology, applied in measurement devices, color/spectral property measurement, material analysis by optical means, etc.

Inactive Publication Date: 2006-05-03
SINOPEC YANGZI PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the test time of this instrument is too long, which is not conducive to the determination of large quantities of polyolefin materials

Method used

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  • Quick determination method for methyl content in polyethylene copolymer
  • Quick determination method for methyl content in polyethylene copolymer
  • Quick determination method for methyl content in polyethylene copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Determination of Methyl Content in Polyethylene Copolymer Standard Sample

[0020] use 13 C-NMR nuclear magnetic resonance method measures each ethylene and different monomer (propylene, butene, hexene) copolymer methyl content value (set as true value), 13 The C-NMR nuclear magnetic resonance method was determined by the Structural Testing Center of the University of Science and Technology of China (national open laboratory) certified by the National Metrology Bureau.

[0021] This method is divided into three parts: the methyl content in the ethylene-propylene copolymer, the methyl content in the ethylene-butylene copolymer, and the methyl content in the ethylhexyl copolymer, depending on the difference in the comonomer in the polyethylene copolymer. For convenience, set R=10X.

[0022] 1.1 Regression analysis of methyl content in ethylene-propylene copolymer and formulation of standard working curve:

[0023] Sample

1#

2#

3#

4#

...

Embodiment 2

[0029] 2.1 Test equipment

[0030] This method is applicable to various models of FT-IR Fourier transform infrared spectrometers. The instrument used in the present invention is:

[0031] (1) German Bruker IFS 66 / S infrared spectrum analyzer

[0032] Light source energy: >26000

[0033] Resolution: 4.0cm -1

[0034] Number of scans: 32 times

[0035] (2) American PE company: SPECAC molding machine

[0036] Pressure: 0-15t

[0037] Temperature: 0-300°C

[0038] 2.2 Test conditions

[0039] Test environment temperature: 25±5℃

[0040] Test environment humidity: R≤55%

[0041] 2.3 Test sample production

[0042] (1) Place the sample pellets (or powder) in the metal mold of the SPECAC compression molding machine lined with aluminum foil (to facilitate the peeling off of the film), and the mold frame is selected as the "C" frame by Beer's law

[0043] (2) The temperature of the molding machine is controlled at 172°C±2°C. The metal mold is heated and melted on the SPECA...

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Abstract

The invention relates to a method for measuring methyl content of the polyethylene copolymer. It can measure the methyl content of the ethane and dissimilar integral copolymer. It uses Fourier transformation infrared spectrometer to measure the odds ratio X of the light absorbing value of the methyl character peak 1378-1379cm-1 peak area and the light absorbing value of the polythene copolymer character peak 2100-1980cm-1 peak area, then it uses the regression formula Yú¢KX+b to compute the methyl content Y% (K, b is constant).

Description

1. Technical field [0001] The present invention relates to the analysis method of polyolefin, in particular, the method for rapid determination of methyl content in the copolymer of ethylene and different monomers (propylene, butene, hexene). 2. Background technology [0002] In recent years, in the development of high-performance and differentiated polyethylene resins, major companies in the world have increasingly adopted the technical route of polymerizing ethylene and other comonomers to obtain polyethylene copolymers with excellent performance. Their chemical properties, crystallization properties, rheological properties, and processing properties are increasingly diverse, which requires analytical studies of their chemical structures. [0003] The determination of the methyl content in the polyethylene copolymer can obtain information such as the content of the monomer in the polyethylene copolymer and the degree of branching, so as to provide a basis for the molecular...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/00G01N21/35
Inventor 杨素
Owner SINOPEC YANGZI PETROCHEM
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