Method for accurately determining rosin softening point by temperature programming headspace gas chromatography

A headspace gas chromatography and temperature-programmed technology is applied in the field of detection of rosin properties, which can solve the problems of cumbersome and time-consuming measurement steps, and achieve the effects of simple operation, overcoming the complexity of instruments, and improving accuracy.

Active Publication Date: 2018-09-14
CHINA TOBACCO YUNNAN IND
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  • Summary
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Problems solved by technology

Obviously, the measurement steps of this method are cumbersome, time-consuming, and require the use of a specific softening point tester, and its application and promotion have certain limitations.

Method used

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  • Method for accurately determining rosin softening point by temperature programming headspace gas chromatography
  • Method for accurately determining rosin softening point by temperature programming headspace gas chromatography
  • Method for accurately determining rosin softening point by temperature programming headspace gas chromatography

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Put 0.75g of block rosin in a headspace bottle, seal it and place the headspace bottle in a headspace sampler, equilibrate at 60°C for 8min, and then detect the signal value of a volatile substance. Then every 3°C rise, equilibrate for 8 minutes, record the signal value of the corresponding volatile substances in the front of the chromatogram, and measure about 8 times in total. Finally, draw a graph of the relationship between the signal value of the volatile substance and the corresponding temperature; determine the softening point of the rosin sample according to the turning point of the graph.

[0027] The conditions of the headspace sampler were as follows: the vibration condition was set to strong oscillation, the pressurization time of the headspace bottle was 15 s, the filling time of the quantitative loop was 10 s, and the transfer time to the GC was 20 s. Gas chromatography operating conditions: hydrogen flame ion detector (FID), carrier gas is nitrogen, combu...

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Abstract

The invention discloses a method for accurately determining the rosin softening point by a temperature programming headspace gas chromatography. Some volatile impurities are contained in rosin solid;when rosin melts, the volatile impurities can fast escape. By the temperature programming headspace gas chromatography, the volatile impurities are determined; the relationship of the temperature andimpurity signals is drawn; the turning point of signal change in the curve is the rosin softening point. The method has the advantages that the determination is fast; the result is objective and accurate; the operation is simple and convenient; the batch detection on the rosin softening point can be realized; the method is suitable for being used under the factory practical production condition and accurately determining the rosin softening point by the headspace gas chromatography in laboratories. The defects of complicated instruments, great errors, low efficiency, great popularization difficulty and the like of the existing method for determining the rosin softening point are overcome.

Description

technical field [0001] The invention relates to the technical field of detection of rosin properties, in particular to a method for accurately measuring the softening point of rosin by using a temperature-programmed headspace gas chromatography. Background technique [0002] Rosin is a substance mainly separated from the secretions of pine trees. It is a very important chemical raw material, which is widely used in paints, coatings, adhesives, papermaking, rubber and other fields. The softening point of rosin is a key factor to measure whether the material can be used to produce products that meet the corresponding requirements and quality. The lower the softening point, the poorer the quality of the product. Therefore, a simple and accurate analytical method for determining the softening point of rosin is of great significance for the quality control of rosin products and the reduction of production costs. [0003] At present, the main method for determining the softenin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/04
CPCG01N25/04
Inventor 余振华戴毅詹建波郑晗朱楚星张莹岳保山谢姣余江柴欣生
Owner CHINA TOBACCO YUNNAN IND
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