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Method for trapping low molecular volatile substances in polypropylene

A technology of volatile substances and low molecular weight, which is applied in the field of analysis of volatile substances in solids. It can solve the problems of expensive headspace sampler, poor parallelism and representativeness, unstable analysis results, etc., and achieve simple and easy analysis steps. , a large sample size, and the effect of ensuring environmental friendliness

Active Publication Date: 2013-06-26
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the existing method of capturing low-molecular volatile substances is generally the method of trapping and injecting samples by headspace sampler, the amount of sample used for a single analysis of this type of method is small, and the analysis results are affected by sampling and operating parameters, etc. The influence of factors is large, resulting in unstable analysis results, poor parallelism and poor representativeness; in addition, the headspace sampler is expensive and costly, which brings a lot of inconvenience to the analysis and research

Method used

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  • Method for trapping low molecular volatile substances in polypropylene
  • Method for trapping low molecular volatile substances in polypropylene
  • Method for trapping low molecular volatile substances in polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The quartz glass tube 2 is placed in the tubular heating furnace 1; Nitrogen gas is passed into the system until no air exists in the system, and then nitrogen gas is passed into one end of the quartz glass tube 2 at a constant speed of 20 mL / min, The other end of the quartz glass tube 2 is connected to the bubble counter 6 in the liquid nitrogen cold hydrazine 5; the quartz glass tube 2 is heated for 60 min under a nitrogen flow and a constant temperature of 140° C.; at the same time, the glass tube is 2. The end gas is passed into the bubble counter 6 in the liquid nitrogen cold hydrazine 5 for condensation and concentration. After the desorption-condensation and concentration is completed, the bubble counter 6 containing the concentrate is placed at room temperature. After the temperature was stabilized, the gas phase components and the residual liquid phase components were collected and analyzed respectively by gas chromatography-mass spectrometry. see results fig...

Embodiment 2

[0052] In addition to weighing 30g of polypropylene sample 1, the heating temperature of the tubular heating furnace 1 is 100°C, the thermal desorption time is 500min, the inner diameter of the quartz glass tube 2 is 15mm, and the flow rate of the carrier gas is 15mL / min , using the same steps as in Example 1 for processing. The qualitative results of GC-MS detection and analysis of gas phase components and residual liquid phase components are the same as those in Figure 3.

Embodiment 3

[0054] In addition to weighing 70g polypropylene sample 1, the heating temperature of the tubular heating furnace 1 is 150°C, the thermal desorption time is 200min, the inner diameter of the quartz glass tube 2 is 35mm, and the flow rate of the carrier gas is 25mL / min , using the same steps as in Example 1 for processing. The qualitative results of GC-MS detection and analysis of gas phase components and residual liquid phase components are the same as those in Figure 3.

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Abstract

The invention discloses a method for trapping low molecular volatile substances in polypropylene. The method comprises the following steps of: (1) thermally desorbing low molecular volatile substances in polypropylene; and (2) condensing and concentrating a carrier gas containing low molecular volatile substances in polypropylene. The method is suitable for trapping low molecular volatile substances in polypropylene industrially produced and analyzing the composition, and has guiding meaning for troubleshooting and control of smell sources in the production process of polypropylene.

Description

technical field [0001] The invention belongs to the technical field of analysis of volatile substances in solids, and in particular relates to a method for capturing low-molecular volatile substances in polypropylene. Background technique [0002] Polypropylene is a colorless, translucent, non-toxic thermoplastic resin with many excellent properties and processing properties. Polypropylene has high transparency, non-toxicity, light specific gravity, easy processing, impact resistance, high strength, chemical corrosion resistance, twist resistance and electrical insulation; and it is easy to improve performance through copolymerization, blending, filling, reinforcement and other technological measures , so that its toughness, rigidity, heat resistance, flame retardancy and other comprehensive properties are combined, so it has a wide range of uses. At present, polypropylene has been widely used in various fields such as chemical industry, chemical fiber, construction, light ...

Claims

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Application Information

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IPC IPC(8): G01N30/02
Inventor 袁炜宋美丽黄河罗春桃孟永智刘志芳
Owner CHNA ENERGY INVESTMENT CORP LTD
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