Method for detecting ethylene or ethylene propylene rubber content in ethylene-propylene copolymerization polypropylene

An ethylene propylene copolymer polypropylene and ethylene propylene rubber technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of large measurement error, high purchase cost, complicated operation, etc., and achieve fast detection speed, wide detection range, The effect of accurate test results

Inactive Publication Date: 2011-05-25
ZHEJIANG UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the chemical analysis method, radioisotope method and model compound method are cumbersome, time-consuming and labor-intensive, and cannot be applied to the online detection of polypropylene; the homopolymer blending method is rarely used due to large measurement errors; the chemical extraction method not only consumes It takes a long time, and the organic solvent used in the extraction process may also cause environmental pollution; the equipment required for the nuclear magnetic analysis method is large in size and high in purchase costs. At the same time, the nuclear magnetic equipment requires high operating conditions and complicated equipment maintenance. The personnel bring a lot of inconvenience; the sample detection of the infrared analysis method requires the sample preparation of the mold, and the online detection cannot be realized

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for detecting ethylene or ethylene propylene rubber content in ethylene-propylene copolymerization polypropylene
  • Method for detecting ethylene or ethylene propylene rubber content in ethylene-propylene copolymerization polypropylene
  • Method for detecting ethylene or ethylene propylene rubber content in ethylene-propylene copolymerization polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The MultiRAM type Fourier Raman spectrometer produced by German Bruker Company is adopted, and the wavelength of the laser light source used in the spectrometer is 1064nm. Set the spectral scanning range of the spectrometer from 0 to 3600cm -1 , with a resolution of 1cm -1 . Through non-immersion measurement, the Raman spectra of several samples of ethylene-propylene copolymer polypropylene were detected, and the ethylene content and ethylene-propylene rubber content were predicted. The ethylene content and ethylene-propylene rubber content of the known samples are shown in Table 1:

[0033] Table 1 Properties of polypropylene samples

[0034] Sample serial number

MFR

Ethylene content

Ethylene Propylene Rubber Content

1

1.5

7.5

12.5

2

2.5

10.5

16.1

3

10.4

6.8

13.4

4

9.0

9.9

20.0

5

8.8

13.5

22.5

6

2...

Embodiment 2

[0058] The MultiRAM type Fourier Raman spectrometer produced by German Bruker Company is adopted, and the wavelength of the laser light source used in the spectrometer is 1064nm. Set the spectral scanning range of the spectrometer from 0 to 3600cm -1 , with a resolution of 10cm -1 . By non-immersion measurement, the Raman spectrum of the ethylene-propylene copolymer polypropylene sample is detected, and the ethylene content is predicted.

[0059] First, according to the Raman spectrum intensity set I corresponding to the preset characteristic wavenumber set RCS detected by the ethylene content RCS Ethylene content Y with polypropylene EC Carry out modeling by multiple linear regression, concrete process is as embodiment 1, obtains the prediction result of ethylene content in the ethylene-propylene copolymer polypropylene, as Figure 6 shown.

[0060] Then, the preset characteristic wavenumber set RCS is optimized, and the characteristic Raman wavenumber set corresponding ...

Embodiment 3

[0088] The MultiRAM type Fourier Raman spectrometer produced by German Bruker Company is adopted, and the wavelength of the laser light source used in the spectrometer is 1064nm. Set the spectral scanning range of the spectrometer from 0 to 3600cm -1 , with a resolution of 4cm -1 . Through non-immersion measurement, the Raman spectrum of the ethylene-propylene copolymer polypropylene sample is detected, and the ethylene content and ethylene-propylene rubber content are predicted.

[0089] Taking the prediction of ethylene-propylene rubber content as an example, the process is as follows:

[0090] First, the Raman spectrum intensity set I corresponding to the preset characteristic wavenumber set RCS detected according to the content of ethylene-propylene rubber RCS with known EPDM content Y R Modeling is carried out by multiple linear regression, the specific process is as in Example 1, and the prediction result of the ethylene-propylene rubber content is obtained, and the ...

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

No PUM Login to view more

Abstract

The invention discloses a method for detecting the content of ethylene or ethylene propylene rubber in ethylene-propylene polypropylene, comprising the steps of obtaining the raman spectrum of an ethylene-propylene polypropylene sample containing known ethylene or ethylene propylene rubber, preprocessing the raman spectrum, conducting correlation modeling through presetting the content of the known ethylene or ethylene propylene rubber and the intensity of the raman spectrum which corresponds to the raman spectrum characteristic wave number set (RCS) so as to obtain a predicted model, detecting the raman spectrum of the ethylene-propylene polypropylene sample to be detected and preprocessing the raman spectrum, guiding the intensity of the raman spectrum of the ethylene-propylene polypropylene sample to be detected, which corresponds to the RCS into the predicted model so as to detect the content of the ethylene or ethylene propylene rubber in the ethylene-propylene polypropylene sample to be detected, and finally reconstructing the RCS through selecting the characteristic of the raman spectrum in the light of the actual situation. The invention has the advantages of convenience, rapidness, accuracy, environmental protection, and the like and can be used for detecting the content of the ethylene or ethylene propylene rubber in ethylene-propylene polypropylene on line or off line during the manufacturing and the production processes of the ethylene-propylene polypropylene.

Description

technical field [0001] The invention relates to the field of Raman spectrum detection, in particular to a Raman spectrum detection method for the content of ethylene and ethylene-propylene rubber in ethylene-propylene copolymerized polypropylene. Background technique [0002] Polypropylene (PP for short) is a polymer obtained by polymerizing propylene as a monomer, and is an important variety of general-purpose plastics. However, the impact toughness of homopolypropylene is low, especially its brittleness at low temperature greatly limits its use. Therefore, people modify it by adding tough materials to blend or copolymerize it to effectively improve the performance of polypropylene. Make polypropylene more widely used. [0003] In ethylene-propylene copolymerized polypropylene, the addition of ethylene can introduce ethylene-propylene rubber to improve the impact resistance of the product. However, the content of ethylene in the copolymer and the content of ethylene-propy...

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
Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
Inventor 王靖岱陈杰勋阳永荣曹翌佳贺益君黄正梁张雷鸣蒋斌波
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap