Determination method of formaldehyde content in waterborne coating adhesive

A technology of formaldehyde content and water-based coatings, which is applied in the direction of analyzing materials through chemical reactions and material analysis through observation of the impact on chemical indicators, and can solve problems such as difficult control of distillation effects

Inactive Publication Date: 2016-08-17
HEFEI JUHE RADIAL CHEM TECH
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  • Abstract
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Problems solved by technology

The main difference of this experimental method is that a defoamer is added during the distillation process. Because many bubbles are generated during the distillation process, it is difficult to control the distillation effect, so a defoamer is added to optimize the distillation effect and speed.

Method used

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  • Determination method of formaldehyde content in waterborne coating adhesive

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Embodiment 1

[0091] The mensuration of the formaldehyde content in the water-based paint binder of the present embodiment comprises step 1), the calibration of formaldehyde standard stock solution; Step 2), the preparation of formaldehyde standard solution and step 3), the drawing of standard curve; It is characterized in that Including step 4), the determination of formaldehyde content, the step 4) includes a distillation step, adding a defoamer in the distillation step.

[0092] Step 1) specifically includes the following operations:

[0093] a) Pipette 20.00mL formaldehyde standard stock solution into a 250ml iodine bottle, add 0.05mol / L iodine solution, 25.0mL, immediately add 1 mol / L sodium hydroxide solution drop by drop until the color fades to light yellow After standing for 15 minutes, add 11 mL of 1mol / L hydrochloric acid solution to acidify;

[0094] b) Titrate with the calibrated sodium thiosulfate solution until light yellow, add 1mL of the newly prepared 1g / 100mL starch indi...

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Abstract

The invention discloses a determination method of formaldehyde content in a waterborne coating adhesive. The method comprises the steps of standardization of a formaldehyde standard reserving solution, formaldehyde standard using solution preparation and drawing of a standard curve; the method is characterized by further comprising the step of determination of the formaldehyde content, wherein the distillation step is included, and a defoaming agent is added in the distillation step. According to the determination method of the formaldehyde content in the waterborne coating adhesive, the distilling effect and speed are optimized.

Description

technical field [0001] The invention relates to a method for measuring formaldehyde content in water-based paint binders. Background technique [0002] Nowadays, the national standards for free formaldehyde in water-based coatings are becoming more and more stringent, and it is a mandatory standard that all enterprises must implement. Therefore, the accuracy of formaldehyde determination is not only related to the interests of various enterprises, but also related to the health of the general public. The method that has been used in national standards and environmental standards is acetylacetone spectrophotometry. This method is also widely used in food and textile industries. It is a classic and recognized method, but due to different detection substances, the operation is different. The main difference of this experimental method is that a defoamer is added during the distillation process, because many bubbles are generated during the distillation process, and it is diffi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 李曼莉葛翔唐红涛
Owner HEFEI JUHE RADIAL CHEM TECH
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