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Lead-containing paint coating standard substance and preparation method thereof

A standard substance and paint coating technology, applied in the field of lead-containing standard substances, can solve the problems affecting the accuracy of toy chemical testing and large interference, and achieve the effect of fast speed, good uniformity and high stability

Active Publication Date: 2017-02-08
DONGGUAN LUNGCHEONG INST OF INTELLIGENT TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the world, there is only lead-containing coating standard substance in the United States, but the lead-containing coating standard substance in the United States is prepared by scraping the paint from the outer wall, and then crushing and mixing it evenly before subpackaging. For inorganic coatings, the current ICP-OES test has relatively large interference, which affects the accuracy of toy chemical tests

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] A standard preparation method for lead-containing paint coatings, the steps of which are as follows: slowly start a vacuum heating mixer, weigh paint and filler (fly ash) and gradually put them into the vacuum heating mixer. The selected paint is polyvinyl / acrylic resin paint, the ratio of paint to filler is about 2:1, and a small amount of boiling oil and water is needed for better diffusion. Then slowly put in the calculated and weighed analytically pure lead chromate, set the stirring speed of the heating mixer at about 60-120 rpm, but without heating, and start the vacuum pump, and stir for 2-4 hours. This process is to make the chromic acid Lead pigments diffuse evenly into the paint. After 2-4 hours, stir while slowly heating, so that the temperature of the mixed material gradually rises to 50-60 degrees, and stir for 1-2 hours. This process is to eliminate the solvent in the paint and make the paint more viscous. Since the drying temperature of the paint should ...

Embodiment 1

[0019] Embodiment 1 making content is the dry coating standard substance of 90mg / kg:

[0020] First take a small amount of wet paint standard substance, apply it on a glass sheet, weigh the mass before drying, then dry the wet paint standard substance in an oven for about 3 hours, weigh the mass after drying, and calculate the solid content of the paint to be about 50%. Weigh 3.8kg of wet paint after peeling. According to the measurement, the solid content of simple wet paint is 50%, that is, the final solid content of simple paint is 1.9kg, and then add 1.9kg of additives (fly ash), then the final The theoretical dry coating standard substance formed is about 3.8kg. Add about 0.6g of analytically pure lead chromate pigment, set the stirring speed of the heating mixer at about 60-120 rpm, but without heating, and start the vacuum pump, stir for 2-4 hours, this process is to make the lead chromate pigment uniform Diffuses into paint. After 2-4 hours, stir while slowly heating...

Embodiment 2

[0021] Embodiment 2 making content is the dry coating standard substance of 200mg / kg:

[0022] First take a small amount of wet paint standard substance, apply it on a glass sheet, weigh the mass before drying, then dry the wet paint standard substance in an oven for about 3 hours, weigh the mass after drying, and calculate the solid content of the paint to be about 40%. Weigh 0.8kg of the wet paint after peeling. According to the measurement, the solid content of the pure wet paint is 50%, that is, the final solid content of the pure paint is 0.32kg, and then add 0.32kg of additives (fly ash), then the final The theoretical dry coating standard substance formed is about 0.64kg. Add about 0.25g of analytically pure lead chromate pigment, set the stirring speed of the heating mixer at about 60-120 rpm, but without heating, and start the vacuum pump, stir for 2-4 hours, this process is to make the lead chromate pigment uniform Diffuses into paint. After 2-4 hours, stir while s...

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Abstract

The invention relates to a lead-containing standard substance and a preparation method thereof. The standard substance is a mixture formed by adding analytically pure lead chromate into polyvinyl or acrylic resin paint and fly ash. The preparation method comprises the following steps of: putting the paint and the fly ash into a vacuum heating stirrer gradually according to a mass ratio of 2:1, making the lead content according to needs, putting the pure lead chromate of the content into the stirrer, letting the heating stirrer to perform stirring for 2-4h, slowly heating the mixture to make the temperature of the mixture gradually raised to 50-60 degrees, and performing stirring for 1-2h, then taking the mixture out, smearing the mixture on a glass plate, placing the glass plate in a drying box, then carrying out scraping and crushing, conducting sieving by a 0.5mm sieve, and performing complete and uniform mixing, thus obtaining the lead-containing paint coating standard substance. The standard substance provided in the invention has good uniformity, can realize fast mass production, and the prepared lead-containing paint coating standard substance has high stability.

Description

technical field [0001] The invention relates to a lead-containing standard substance, specifically refers to a lead-containing paint coating standard substance for testing lead content and a preparation method thereof. Background technique [0002] Lead-containing paint coating reference materials (reference materials) are widely used in toy chemical testing, and China has not yet approved similar reference materials / standard reference materials. In the world, there is only lead-containing coating standard substance in the United States, but the lead-containing coating standard substance in the United States is prepared by scraping the paint from the outer wall, and then crushing and mixing it evenly before subpackaging. For inorganic coatings, the current ICP-OES test has relatively large interference, which affects the accuracy of toy chemical tests. This lead-containing coating standard substance is seriously inconsistent with the standard substance matrix tested by the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
Inventor 梁钟铭
Owner DONGGUAN LUNGCHEONG INST OF INTELLIGENT TECH
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