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A water-based emulsion adhesive free formaldehyde demulsification detection reagent and free formaldehyde detection method using the reagent

A detection method, water-based emulsion technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of condensation on the wall of the flask, gas leakage recovery rate, manual monitoring, etc., to achieve rapid response, small impact, and high accuracy of results Effect

Active Publication Date: 2020-05-29
中山永恒检测科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The detection of free formaldehyde content is the main indicator for the environmental protection evaluation of water-based emulsion adhesives. According to the current detection standard GB 18582-2008, the traditional distillation method is used, but the traditional distillation method has the following disadvantages: (1) The problem of air leakage makes the recovery rate low ; (2) Water-based emulsion adhesives are prone to condensation on the wall of the flask during distillation and over-balance, and decompose during continuous heating, resulting in false positive results; (3) Time-consuming, manual monitoring, and low efficiency

Method used

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  • A water-based emulsion adhesive free formaldehyde demulsification detection reagent and free formaldehyde detection method using the reagent
  • A water-based emulsion adhesive free formaldehyde demulsification detection reagent and free formaldehyde detection method using the reagent
  • A water-based emulsion adhesive free formaldehyde demulsification detection reagent and free formaldehyde detection method using the reagent

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Experimental program
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Effect test

Embodiment 1

[0024] A, take by weighing 1g of water-based emulsion adhesive sample, place in the centrifuge tube, add the demulsification detection reagent that is mixed by 20% methanol solution and 1g sodium chloride, mix;

[0025] B. Stand still, centrifuge, transfer the supernatant to a colorimetric tube, rinse the centrifuge tube with an appropriate amount of 20% methanol solution, adjust the pH to 6.0±0.2 with dilute hydrochloric acid solution or dilute sodium hydroxide solution, add methanol solution to the mark;

[0026] C, adding 0.25% acetylacetone solution and shaking;

[0027] D. Place it in a 60°C water bath for 30 minutes, take it out and cool it to room temperature;

[0028] E. Then measure its absorbance at 412nm, and obtain the formaldehyde concentration by comparing with the standard curve.

Embodiment 2

[0030] A, take by weighing 1g of water-based emulsion adhesive sample, place in centrifuge tube, add the demulsification detection reagent that is made by mixing 20% ​​ethanol solution and 1g sodium chloride, mix;

[0031] B. Stand still, centrifuge, transfer the supernatant to a colorimetric tube, rinse the centrifuge tube with an appropriate amount of 20% ethanol solution, adjust the pH to 6.0±0.2 with dilute hydrochloric acid solution or dilute sodium hydroxide solution, add ethanol solution to the mark;

[0032] C, adding 0.25% acetylacetone solution and shaking;

[0033] D. Place it in a water bath at 50°C for 20 minutes, take it out and cool it to room temperature;

[0034] E. Then measure its absorbance at 410nm, and obtain the formaldehyde concentration by comparing with the standard curve.

Embodiment 3

[0036] A, take by weighing 0.5g of aqueous emulsion adhesive sample, be placed in the centrifuge tube, add the demulsification detection reagent that is mixed by 20% ether solution and 3g sodium chloride, mix;

[0037] B. Stand still, centrifuge, transfer the supernatant to a colorimetric tube, rinse the centrifuge tube with an appropriate amount of 20% ether solution, adjust the pH to 6.0±0.2 with dilute hydrochloric acid solution or dilute sodium hydroxide solution, add Diethyl ether solution to the mark;

[0038] C, add acetylacetone solution and shake well;

[0039] D. Place it in a water bath at 55°C for 50 minutes, take it out and cool it to room temperature;

[0040] E, then measure its absorbance at 415nm, and obtain the formaldehyde concentration by comparing with the standard curve.

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Abstract

The invention discloses a waterborne emulsion adhesive free formaldehyde demulsification detection reagent and a free formaldehyde detection method using the same. The reagent is formed by mixing oneor multiple of methanol, alcohol and ethyl ether organic solution of 20-40% and 1-5g of sodium chloride. The detection method includes following steps: A, weighing a waterborne emulsion adhesive sample, putting the same in a centrifugal tube, adding the demulsification detection reagent, and well mixing; B, standing, centrifuging, transferring supernate into a colorimetric tube, using a proper amount of alcohol solution of 20-40% to rinse the centrifugal tube, using diluted hydrochloric acid solution or diluted sodium hydroxide solution to adjust pH to 6.0+ / -0.2, and adding alcohol solution toa scale; C, adding acetylacetone solution, and shaking well; D, putting into water bath of 50-60 DEG C for 20-50min, taking out, and cooling to room temperature; E, measuring light absorbance at 410-415nm, and acquiring formaldehyde concentration through standard curve comparison.

Description

【Technical field】 [0001] The invention relates to the field of paint detection, in particular to an aqueous emulsion adhesive free formaldehyde demulsification detection reagent and a free formaldehyde detection method using the reagent. 【Background technique】 [0002] Formaldehyde is a colorless, highly irritating gas that is volatile. Formaldehyde in indoor air has become the main pollutant affecting human health, especially formaldehyde in winter air is the most harmful to human body. The sources of formaldehyde in the air of households in my country mainly include the following aspects: (1) Artificial boards such as plywood, blockboard, medium density fiberboard and particle board used for interior decoration. The adhesive used in the production of wood-based panels uses formaldehyde as the main component. The residual and unreacted formaldehyde in the panels will gradually be released to the surrounding environment, which is the main formaldehyde in the indoor air. (2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 熊幸罗斌汉陈丽红
Owner 中山永恒检测科技有限公司
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