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On-line detection system and method for performance parameters of propylene copolymer

A propylene copolymer and detection system technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of high toxicity, low accuracy, and no online detection system in chemical extraction methods

Active Publication Date: 2012-10-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of traditional homopolypropylene such as weak rigidity and poor impact resistance have always affected its processing performance and use performance.
The chemical extraction method is highly toxic and the operation steps are complicated; and online detection cannot be realized
Infrared spectroscopy requires pretreatment such as film pressing, and it is not suitable for online detection
Raman spectroscopy can realize online detection due to its non-destructive testing characteristics, but there is no online detection system based on Raman spectroscopy
In addition, the current method of Raman detection of xylene soluble content and ethylene content in propylene copolymer is not accurate enough for data processing.

Method used

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  • On-line detection system and method for performance parameters of propylene copolymer
  • On-line detection system and method for performance parameters of propylene copolymer
  • On-line detection system and method for performance parameters of propylene copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The cold mold experiment simulates the sampling and sample purging process: the propylene copolymer sample used in the experiment is provided by Qilu Petrochemical, with a density of 900kg / m 3 , The particle size distribution is measured by the sieving experiment (see Table 1), and the test results show that the weight of the material with a particle size less than 0.09mm only accounts for 0.4% of the total weight. Air transportation is used for product transportation in the industry, with an air volume of 7000m 3 / h, the gas volume flow rate in the cold model experiment is reduced to 1000m 3 / h, the cyclone separator used is designed to have a critical separation particle size of 0.0065mm, which is less than 0.09mm, so as to ensure that all materials can be separated from the conveying airflow.

[0064] Table 1 particle size distribution

[0065]

[0066] The material of the laboratory design cyclone separator is plexiglass. The main design parameters: the cylind...

Embodiment 2

[0074] Establish a black box model to calculate the performance parameters of the propylene copolymer: the MultiRam Fourier Raman spectrometer produced by the German Bruker company is used, and the detection parameters are as follows: the scanning range is 50-3600cm -1 , the laser intensity is 500mW, and the resolution is 4cm -1 , the number of scans is 32 times. Non-immersion measurement, detecting the Raman spectra of several propylene copolymer reference samples, and predicting the xylene soluble content, ethylene content and ethylene content in the soluble content of the propylene copolymer sample to be tested. See Table 3 for the xylene soluble content, ethylene content and ethylene content in the soluble content of the samples.

[0075] Table 3 The indicators of the samples

[0076]

[0077] First of all, in order to reduce the scattering effect caused by uneven particle distribution and particle size, and effectively enhance the spectral information related to the ...

Embodiment 3

[0084] Calculation of performance parameters of propylene copolymer by superposition method: MultiRam Fourier Raman spectrometer produced by German Bruker company is used, and the detection parameters are as follows: the scanning range is 50-3600cm -1 , the laser intensity is 500mW, and the resolution is 4cm -1 , the number of scans is 32 times. Non-immersion detection density is 950kg / m 3 High-density polyethylene (LDPE for short) reference sample with a density of 890kg / m 3 Raman spectra of homopolypropylene (referred to as PP) reference sample and xylene leached matter (referred to as XS) reference sample. Non-immersion detection density is 900kg / m 3 The Raman spectrum of the propylene copolymer test sample (sample 1 in embodiment 2). The xylene soluble content, ethylene content and ethylene content in the soluble content of sample 1 were calculated by superposition method.

[0085] Assume that the molecular content of homopolyethylene contained in the sample of propyl...

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Abstract

The invention discloses an on-line detection system for performance parameters of propylene copolymer. The on-line detection system comprises an on-line sampler, a detection tank for containing samples collected by the on-line sampler, a Raman spectrometer used for collecting the Raman spectrum signals of the samples in the detection tank and a processor for calculating the collected Raman spectrum signals to obtain the performance parameters of the propylene copolymer. In addition, the invention also relates to an application method for the system. The method mainly comprises an on-line sampling method and a spectral analysis method. According to the invention, the blank in the field of industrial rapid and accurate on-line detection of contents of xylene soluble and ethylene in the propylene copolymer as well as content of ethylene in a soluble substance is filled up, and a strong basis is provided for the monitoring and optimization of propylene copolymer production.

Description

technical field [0001] The invention relates to a system and method for detecting performance parameters of propylene copolymers, in particular to a system and method for detecting performance parameters of propylene copolymers by using Raman spectroscopy. Background technique [0002] Polypropylene (Polypropylene) plastic has been in a strong trend since its commercial production in 1957. In the mid-1990s, it became the most demanded plastic in the thermoplastic market. However, the disadvantages of traditional homopolypropylene such as weak rigidity and poor impact resistance have always affected its processing performance and use performance. Heterophase impact copolymer polypropylene is a new type of polypropylene that introduces ethylene copolymerization into ethylene-propylene rubber during the polymerization process to improve the impact resistance of traditional homopolypropylene. Due to its good impact resistance and excellent processability, heterophase impact cop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 王靖岱杨遥蒋斌波黄正梁廖祖维阳永荣张擎蒋云涛何乐路周利
Owner ZHEJIANG UNIV