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Method for determining VOC content in EPS foam

A measurement method and foam technology, applied in the field of analysis and detection, can solve the problems of TD tube pollution, cumbersome detection steps, long thermal desorption time, etc., to achieve the effect of ensuring accuracy and consistency, reducing loss, and reducing sample preparation time

Pending Publication Date: 2022-05-13
青岛科大新橡塑检测服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The conventional method for the determination of VOC content in EPS foam is the bag method. The detection method has cumbersome detection steps. During the detection process, it is necessary to ensure that a number of conditions are stable. The repeatability of the detection results is not good, and the recovery rate of the target is not high.
Another detection method is to put the sample directly into the TD tube for thermal desorption and GC / MS analysis. The existing method takes a long time for thermal desorption, and it is easy to cause pollution of the TD tube, and it is impossible to distinguish the substances that contribute greatly to the odor.

Method used

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  • Method for determining VOC content in EPS foam
  • Method for determining VOC content in EPS foam
  • Method for determining VOC content in EPS foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, this experimental example detects the content of TVOC in the sample.

[0032] 1. Sample pretreatment: Accurately weigh 0.0103g of EPS foam sample with a particle size of 12-20 mesh, wrap it with a 300-mesh nickel mesh, put it in an empty TD sample tube, and wait for analysis on the machine.

[0033] 2. Preparation of standard sample: Take 0.02g of styrene with a micro-injector and add it to the volumetric flask, dilute to 10ml with methanol, and mix it with ultrasonic waves as the standard solution. At this time, the concentration of styrene in the standard solution is 2000ppm. The concentration of styrene standard solution is diluted with methanol to 50ppm, 100ppm, 200ppm, 500ppm, 1000ppm. Then use a micro-sampling needle to take 1ul of the standard solution and inject it into the sample tube of Tenax TA, and wait for analysis on the machine.

[0034] 3. Thermal desorption instrument conditions: Instrument: analysis temperature: 75°C; analysis time: 10mi...

experiment example 2

[0040] This experimental example detects the content of TVOC in the sample.

[0041] 1. Sample pretreatment: Accurately weigh 0.0109g of EPS foam sample with a particle size of 12-20 mesh, wrap it with a 300-mesh nickel mesh, put it in an empty TD sample tube, and wait for analysis on the machine.

[0042] 2. Preparation of standard sample: Take 0.02g of styrene with a micro-injector and add it to the volumetric flask, dilute to 10ml with methanol, and mix it with ultrasonic waves as the standard solution. At this time, the concentration of styrene in the standard solution is 2000ppm. The concentration of styrene standard solution is diluted with methanol to 50ppm, 100ppm, 200ppm, 500ppm, 1000ppm. Then use a micro-sampling needle to take 1ul of the standard solution and inject it into the sample tube of Tenax TA, and wait for analysis on the machine.

[0043] 3. Thermal desorption instrument conditions: Instrument: analysis temperature: 75°C; analysis time: 10min; cold hydraz...

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Abstract

The invention discloses a method for determining the content of VOC (volatile organic compound) in EPS (expandable polystyrene) foam, which comprises the following steps: step 1, pretreatment: accurately weighing the EPS foam, wrapping the EPS foam with a 300-mesh nickel net, putting the wrapped EPS foam into a TD (thermal desorption) sample tube, and performing thermal desorption treatment and GC / MS (gas chromatography / mass spectrometry) qualitative analysis on the EPS foam in the TD sample tube to obtain a qualitative result; step 2, establishing a standard sample, taking styrene as an external standard substance, performing quantitative treatment on a qualitative result in the step 1, connecting the rear end of a chromatographic column with an olfactory discrimination instrument, and analyzing detected substances by an olfactory discriminator; and step 3, quantitative treatment: in the quantitative treatment process in the step 2, the VOC content in the EPS is defined as TVOC, and then the content of the VOC in the EPS is measured through a quantitative formula of the TVOC. The method has the beneficial effects that the accuracy and consistency of detection results are ensured, the detection time is shortened, and the detection efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of analysis and detection, in particular to a method for measuring VOC content in EPS foam. Background technique [0002] EPS foam, also known as expanded polystyrene foam (Expanded Polystyrene, referred to as EPS), is a light-weight polymer. It uses polystyrene resin to add a foaming agent, and heats it to soften it to generate gas to form a hard closed cell. Structural foam plastic. Existing EPS foam products contain volatile organic compounds-VOC. The content of VOC in EPS is an important indicator of environmental testing, so it is very important for the detection of VOC in EPS. [0003] The conventional method for determining the VOC content in EPS foam is to use the bag method for detection. The detection method has cumbersome detection steps, a number of conditions need to be stable during the detection process, poor repeatability of test results, and low recovery rate of target objects. Another det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/06G01N30/88
CPCG01N30/06G01N30/88
Inventor 陈福花韩冰王雪李伟王文刘涵
Owner 青岛科大新橡塑检测服务有限公司