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Method for rapidly detecting adulteration of melamine tableware by using infrared spectrum

A technology of infrared spectroscopy and tableware, applied in the field of detection, can solve the problem of not being able to identify the amount of urea-formaldehyde resin added to the blended molded dinner plate, and achieve the effect of simple operation and reliable technology

Pending Publication Date: 2021-06-18
江西省产品质量监督检测院
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a method for quickly detecting the adulteration of melamine tableware by using infrared spectroscopy, which solves the problem that the prior art cannot identify the blended molded tableware with the addition of urea-formaldehyde resin below 30%. question

Method used

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  • Method for rapidly detecting adulteration of melamine tableware by using infrared spectrum
  • Method for rapidly detecting adulteration of melamine tableware by using infrared spectrum
  • Method for rapidly detecting adulteration of melamine tableware by using infrared spectrum

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Making tableware: use urea-formaldehyde resin powder and melamine resin powder to make standard melamine resin tableware (A5), urea-formaldehyde resin tableware (A1) and melamine-urea-formaldehyde blend molded tableware (A1-A5). Among them, the melamine urea-formaldehyde blended molded tableware (A1-A5) is 1:9, 2:8, 3:7, 4:6, 5:5, 6:5, 7 according to the mass ratio of melamine resin and urea-formaldehyde resin :3, 8:2, 9:1 ratio production.

[0030] (2) Detection spectrum: Infrared spectra of standard melamine resin tableware (A5), urea-formaldehyde resin tableware (A1) and melamine urea-formaldehyde blend molded tableware (A1-A5).

[0031] (3) Model building: Import the infrared spectra obtained from standard melamine resin tableware (A5), urea-formaldehyde resin tableware (A1) and melamine urea-formaldehyde blend molded tableware (A1-A5) into the TQ analyst spectral analysis software , randomly select 75% of the infrared spectra of three types of tableware as a c...

Embodiment 2

[0033] Qualitative modeling:

[0034] (1) Create a model file in the TQ analyst spectral analysis software, select DA as the modeling function, define the names of standard melamine resin tableware, urea-formaldehyde resin tableware, and melamine-urea-formaldehyde blended tableware, and establish standard melamine tableware through DA The qualitative model of the infrared spectrum of resin tableware, urea-formaldehyde resin tableware and melamine-urea-formaldehyde blended molded tableware is obtained, and the calculation results and classification distribution diagrams are obtained, such as figure 1 As shown, it can be seen that the infrared spectra of the three types of tableware are well separated, and there is basically no overlap.

[0035] figure 1 Among them, the tableware on the same side as the PC3 axis is unadulterated standard melamine resin tableware, the tableware on the same side as the PC1 axis is urea-formaldehyde resin tableware, and the tableware on the middle...

Embodiment 3

[0040] Quantitative modeling:

[0041] (1) Create a model file in the TQ analyst spectral analysis software, select PLS as the modeling algorithm, select a constant optical path, and define the names of standard melamine resin tableware, urea-formaldehyde resin tableware and melamine-urea-formaldehyde blended molded tableware respectively, and carry out feasible For the performance test, add the infrared spectrograms of three types of tableware, use MSC for spectral pretreatment, and choose 600-4000cm -1 Spectral range, save the quantitative model, and get the calculation result of the quantitative model.

[0042] (2) Use the cross-validation method to verify the quantitative model, and evaluate the performance of the quantitative model by the correlation coefficient R and the predicted mean square error RMSEP between the infrared spectrogram NIR prediction values ​​of the three types of tableware in the verification set and their actual values, as shown in Table 2 shown.

...

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Abstract

The invention discloses a method for rapidly detecting the adulteration of melamine tableware by using infrared spectroscopy, which comprises the following steps of: manufacturing a standard melamine resin dinner plate, a urea resin dinner plate and a melamine-urea formaldehyde blended molding dinner plate, and carrying out infrared spectroscopy detection on the dinner plates to obtain an infrared spectrogram of the dinner plates; then performing data preprocessing on the infrared spectrogram in a multivariate scatter correction data preprocessing mode, respectively establishing a qualitative model and a quantitative model by adopting orthogonal partial least squares-discriminant analysis and partial least squares, verifying the models, and finally importing the infrared spectrogram of the to-be-detected tableware to obtain an analysis report of the to-be-detected tableware. According to the invention, the model is used for identifying samples purchased from the market and adulterated samples, operation is easy, and the technology is reliable, so that whether melamine tableware is adulterated or not can be judged losslessly, rapidly and directly.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a method for quickly detecting adulteration of melamine tableware by using infrared spectroscopy. Background technique [0002] Melamine tableware is made of melamine-formaldehyde resin as the base material and melamine molding powder with α-cellulose as the filler, and is made by compression molding. It is widely used in people's daily life. In the quality and safety indicators of melamine tableware, pollution resistance, heat and humidity resistance, formaldehyde and melamine migration are prone to failure. Among them, some melamine tableware mixed with urea-formaldehyde resin on the market is likely to cause the above-mentioned quality and safety problems, especially the excessive migration of formaldehyde is an important indicator affecting the safety of tableware. [0003] The adulteration of melamine tableware mainly falls into three categories: the first category is ure...

Claims

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Application Information

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IPC IPC(8): G01N21/3563G06F30/20
CPCG01N21/3563G06F30/20G01N2021/3572
Inventor 甘蓓陈奕毛炜翔
Owner 江西省产品质量监督检测院
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