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Method for determining carbon black content of PE reclaimed material by using combustion method

A technology of recycled material and combustion method, which is used in chemical analysis by combustion and weighing by removing certain components. The black content detection error increases and other problems, to achieve the effect of achieving as much consistency as possible, complete pyrolysis, and reducing the probability of oxidation

Inactive Publication Date: 2018-08-24
江阴爱科森博顿聚合体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the upper limit of the pyrolysis temperature using the combustion method in the prior art is 600°C, and the holding time during the pyrolysis process is relatively short (in the GB / T2951.41 standard, the holding time is 10 minutes after the temperature is raised to 600°C), so that PE The pyrolysis process of recycled materials is not thorough enough, which leads to the large carbon black content data of PE recycled materials finally measured by combustion method
[0005] In addition, when measuring the carbon black content of PE materials in the prior art, after the PE sample is pyrolyzed at high temperature, the temperature of the combustion boat containing the PE sample passing through the combustion tube containing nitrogen is relatively high, resulting in a high temperature in the PE sample. Part of the carbon black exposed to air will be oxidized, which will increase the detection error of carbon black content.

Method used

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Effect test

Embodiment 1

[0028] A method for the carbon black content of PE recycled materials by combustion method, including the steps of initial weighing of PE recycled materials, pyrolysis, weighing after pyrolysis, combustion, and weighing after combustion, wherein pyrolysis is carried out at 600°C under nitrogen atmosphere , the holding time is extended to 50min, and the temperature is lowered to 450°C under the nitrogen atmosphere, then the nozzle is opened, and the combustion boat is dragged to the nozzle to cool for 5min, the atmosphere flow rate is the same as the existing detection standard, and then the combustion boat is removed Take it out of the combustion tube, cool it in a desiccator for 10-20 minutes, and weigh it; then put the combustion boat into the combustion tube, and pass air or oxygen into the combustion tube at a temperature of (600±20)°C at an appropriate flow rate , to burn the residual carbon black, take out the combustion boat from the combustion tube again, cool it in the...

Embodiment 2

[0031] A method for the carbon black content of PE recycled materials by combustion method, including the steps of initial weighing of PE recycled materials, pyrolysis, weighing after pyrolysis, burning, and weighing after burning, wherein PE recycled materials are heated in a nitrogen atmosphere at 600 ° C After pyrolysis, extend the holding time to 50 minutes, and then lower the temperature from 600°C to 400°C, and then open the nozzle to avoid partial oxidation of PE recycled materials in contact with air at a high temperature of 600°C, which will cause carbon black Content detection is not accurate.

Embodiment 3

[0033] A method for the carbon black content of PE recycled materials by combustion method, including the steps of initial weighing of PE recycled materials, pyrolysis, weighing after pyrolysis, burning, and weighing after burning. When the temperature is lowered from 850°C to 450°C, drag the combustion boat to the nozzle, cool for 5 minutes, cool to room temperature in a desiccator, and weigh it; Pass it into the combustion tube to burn the residual carbon black, take out the combustion boat from the combustion tube again, cool it in a desiccator for 10-20 minutes, and weigh it again.

[0034] Nitrogen gas is passed at the temperature of 0-850° C., so that the pyrolysis temperature condition is consistent with the pyrolysis temperature condition of the thermogravimetric analysis method.

[0035]After the above-mentioned high-temperature pyrolysis at 850°C, the temperature inside the tube is lowered to 450°C, which can avoid part of the PE recycled material being oxidized in c...

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PUM

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Abstract

The invention relates to the testing technical field of black polyethylene plastics for wires and cables, and discloses a method for determining carbon black content of a PE reclaimed material by using a combustion method, the method includes initial weighing of a PE sample, pyrolysis, weighing after the pyrolysis, combustion, weighing after the combustion, and other steps. In the process ofweighing after the pyrolysis, after cooling in a nitrogen atmosphere to 400 DEG C-450DEG C, the opening of a combustion tube is opened, a combustion boat is dragged to the opening for cooling for 5 min, andthe combustion boat is taken out of the combustion tube. The accuracy of detection of the carbon black content in the PE reclaimed material can be improved by changing of temperature of oxygen introduction in the combustion method or heat insulating time of nitrogen gas introduction at 600DEG C or changing of the temperature of oxygen introduction in the combustion method from 600 DEG C to 850 DEG C, so that the result of the method is substantially consistent with the result of a thermogravimetric analysis method.

Description

technical field [0001] The invention relates to the technical field of black polyethylene plastic detection for electric wires and cables, in particular to a method for measuring the carbon black content of PE reclaimed materials by using a combustion method. Background technique [0002] In the prior art, the detection methods of carbon black content in polyethylene plastic (PE) mainly include thermogravimetric analysis method and combustion method. For example, the National Standard GB / T2951.41 of the People's Republic of China (Part 41 of General Test Methods for Insulation and Sheathing Materials of Electric and Optical Cables) stipulates the detection standards of thermogravimetric analysis and combustion method. [0003] However, when the two different methods of thermogravimetric analysis and combustion method are used for detection, the measured data have certain errors, especially for the use of recycled materials to make PE materials, the PE recycled materials meas...

Claims

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Application Information

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IPC IPC(8): G01N31/12G01N5/04
CPCG01N5/04G01N31/12
Inventor 苏迎旭黄小明
Owner 江阴爱科森博顿聚合体有限公司