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Method for rapidly determining residual quantity of formaldehyde in water-based adhesive

A rapid determination, water-based technology, applied in the preparation of test samples, material analysis by observing the impact on chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of high cost, low efficiency, It is unfavorable for the rapid determination of large batches of samples, etc.

Pending Publication Date: 2021-05-28
CHINA TOBACCO JIANGSU INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The test strip method or kit method is mainly used for the rapid determination of formaldehyde in the air; while the determination method of formaldehyde residual in water-based adhesive mainly adopts spectrophotometry and HPLC method. Although the detection results of these instrument analysis methods are accurate and reliable, but There are disadvantages such as low efficiency, high cost, and not conducive to rapid determination of large quantities of samples

Method used

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  • Method for rapidly determining residual quantity of formaldehyde in water-based adhesive

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Experimental program
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Embodiment 1

[0038] Production of standard color charts:

[0039] S1. First configure a ferric ammonium sulfate solution with a mass concentration of 2.0%, take 5 mL of the solution and add 10 mL of ethanol to mix and shake well to obtain a soaking solution;

[0040] S2. Take 1~5mL of the test strip soaking solution prepared in step S1 and add it dropwise to the center of ϕ12cm qualitative filter paper, place the filter paper on a square glass plate with a side length of 20cm, and then cover the glass plate with a glass of the same size Cover plate, in order to make the filter paper fully absorb the soaking solution and prevent the soaking solution from being adsorbed to the glass cover plate, after the soaking solution is completely spread on the filter paper, soak for 2 minutes;

[0041] S3. Put the square glass plate in step S2 in a vacuum drying oven at 100°C for 2 minutes and take it out to remove moisture and ethanol on the test strip. The purpose is to ensure that the test strip doe...

Embodiment 2

[0045] S1. First configure a ferric ammonium sulfate solution with a mass concentration of 1.0%, take 5 mL of the solution and add 5 mL of ethanol to mix and shake well to obtain a soaking solution;

[0046] S2. Take 1~5mL of the test strip soaking solution prepared in step S1 and add it dropwise to the center of ϕ12cm qualitative filter paper, place the filter paper on a square glass plate with a side length of 20cm, and then cover the glass plate with a glass of the same size Cover plate, in order to make the filter paper fully absorb the soaking solution and prevent the soaking solution from being adsorbed to the glass cover plate, after the soaking solution is completely spread on the filter paper, soak for 1 min;

[0047] S3. Put the square glass plate in step S2 in a vacuum drying oven at 50°C for 1 minute and take it out to remove the moisture and ethanol on the test strip. The purpose is to ensure that the test strip does not turn yellow and eliminate background interfe...

Embodiment 3

[0051] S1. First configure a ferric ammonium sulfate solution with a mass concentration of 5.0%, take 1 mL of the solution, add 5 mL of ethanol, mix and shake well to obtain a soaking solution;

[0052] S2. Take 1~5mL of the test strip soaking solution prepared in step S1 and add it dropwise to the center of ϕ12cm qualitative filter paper, place the filter paper on a square glass plate with a side length of 20cm, and then cover the glass plate with a glass of the same size Cover plate, in order to make the filter paper fully absorb the soaking solution and prevent the soaking solution from being adsorbed to the glass cover plate, after the soaking solution is completely spread on the filter paper, soak for 5 minutes;

[0053] S3. Put the square glass plate in step S2 in a vacuum drying oven at 120°C for 5 minutes and take it out to remove moisture and ethanol on the test strip. The purpose is to ensure that the test strip does not turn yellow and eliminate background interferen...

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Abstract

The invention discloses a method for rapidly determining the residual quantity of formaldehyde in a water-based adhesive, wherein the method comprises the following steps: S1, mixing and shaking up an ammonium ferric sulfate solution and ethanol to obtain a soaking solution; S2, sucking the soaking solution, dropwise adding to the center of qualitative filter paper, placing the qualitative filter paper on a glass plate after soaking, and then covering the glass plate with a same glass cover plate; S3, placing the glass plate in a vacuum drying oven, drying, taking out the glass plate, and cutting the filter paper into a test strip for later use; S4, weighing a water-based adhesive sample, putting the water-based adhesive sample into a 10 mL centrifugal tube, adding 1-5 mL of a 0.05% phenol reagent solution, carrying out vortex oscillation extraction for 10-12 min, standing, taking 0.5-0.6 [mu]L of supernatant liquid at the center of the test strip, putting the test strip into a drying oven, drying, and taking out the test strip; S5, absorbing 0.5-5 [mu]L of a hydrochloric acid solution, dropwise adding the hydrochloric acid solution to the center of the test strip, and carrying out a chromogenic reaction; S6, making a standard colorimetric card; and S7, comparing the color-developed test strip with a standard colorimetric card, and carrying out quantitative analysis. The method is simple, convenient, rapid and reliable to operate, and can be suitable for rapidly measuring the residual quantity of formaldehyde in the water-based adhesive in batches.

Description

technical field [0001] The invention relates to the technical field of formaldehyde determination, in particular to a method for rapidly determining residual formaldehyde in water-based adhesives. Background technique [0002] Water-based adhesive refers to the adhesive that uses water as the dispersion medium, also known as water-based adhesive. It is a type of adhesive that has developed rapidly in my country in recent years. In 2012, the output reached 3.41 million tons, accounting for about 60.9% of the total adhesive output. Compared with solvent-based adhesives, water-based adhesives have the advantages of environmental protection, low cost, non-combustibility, safe production and use, and easy viscosity adjustment due to the use of water as the dispersion medium. The water-based adhesive for tobacco is one of the tobacco materials, and it is mainly used for the bonding of cigarette laps, cigarette joints, filter rod midlines, cartons and small box packaging. Due to t...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N1/38G01N1/34
CPCG01N21/78G01N1/38G01N1/34
Inventor 成涛张春晖胡奇刘阚张钺王仰勋白国强侯世聪王光耀林雅文郭军伟王洪波赵乐
Owner CHINA TOBACCO JIANGSU INDAL