Method for fast detecting phthalate compound in plastic products

Abstract

A method for quickly detecting phthalic acid esters compound in plastics, comprising: producing a standard sample; performing the infrared spectrum transmission test; obtaining the linear regression equation and correlation coefficient and detecting the plastics. The method uses the di(2-ethy(hexylphthalate)-DEHP as main researching object and the standard sampler is prepared by adding DEHP in the blank solution thereby preventing the change of character substance DEHP due to effect of adding additive and high temperature during expanding a roller, thus the reliability of the standard curve is ensured and the effect of the solvent is not easy to be detected using the infrared spectrum; The curve of peak area ratio of carbonyl peak to carbon-hydrogen telescopic vibration to the concentration is calculated using relative peak area and the effects of the exogenous pollution and other factors are reduced and more reasonably the reliability of the standard curve and the result reality are ensured; the sampler processing way is simple and the infrared spectrum transmission test is performed on by dissolving the plastics to be tested, in favor of lab quick detection.

Description

technical background [0001] The invention relates to a method for quickly detecting phthalate compounds in plastic products, belonging to the technical field of detection of plastic products. Background technique [0002] Phthalates are widely used in PVC products because they can increase the plasticity and strength of plastics. However, it is carcinogenic and can cause damage to the human hormonal system and nervous system. Countries such as the European Union have established some limit standards for phthalates in food, textiles and buildings. The most typical ingredient in phthalates is DEHP. Therefore, it is necessary to establish a rapid and effective method for analyzing and detecting the content of phthalates in plastic products. At present, there are methods such as gas phase, liquid phase, gas-mass spectrometry, and liquid-mass spectrometry to detect the content of phthalates in plastic products. These methods have the advantages of high sensitivity, good separa...

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Problems solved by technology

At present, there are methods such as gas phase, liquid phase, gas-mass spectrometry, and liquid-mass spectrometry to detect the content of phthalates in plastic products. These methods have the advantages of high sensitivity, good separation effect and high precision of quantitative analysis. It is widely used; however, these analytical methods must use large-scale instruments, and there are high equipment and instrument costs, cumbersome operations, and are not suitable for routine use and rapid detection; it is not suitable for the use of grassroots units

Wang Chengyun et al. "Quantitative Determination of DEHP in PVC Toys by Fourier Transform Infrared Spectroscopy" discloses a method for the determination of phthalates. In this experiment, PVC film is melted and hot-pressed into a film. In order to ensure Add some additives—lubricant, heat stabilizer and light stabilizer, etc. to improve the performance of the film. The addition of these materials will cause the increase of the hydroxyl content and affect the infrared spectrum results of the characteristic peaks; this method is in the process of quantification Adopted 1730cm -1 The nearby carbonyl peak is used as a characteristic peak, ignoring the influence of other carbonyl sources, and cannot fully express the content of DEHP in the product

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