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Method for detecting red phosphorus content in electronic product by gravimetric method

A technology of electronic products and gravimetric method, which is applied in the field of measuring red phosphorus content in electronic products by gravimetric method, can solve problems such as endangering human health, and achieve the effects of reliable method, easy implementation, and convenient method

Active Publication Date: 2009-07-29
谱尼测试集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of electronic products added with red phosphorus flame retardants is harmful to human health, so the content of red phosphorus in electronic products should be limited, but my country has not yet issued a detection standard for red phosphorus in electronic products

Method used

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  • Method for detecting red phosphorus content in electronic product by gravimetric method
  • Method for detecting red phosphorus content in electronic product by gravimetric method
  • Method for detecting red phosphorus content in electronic product by gravimetric method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: Detection of the precision and recovery rate of red phosphorus content in plastics

[0011] Weigh 10 g of the sample pulverized by the freeze pulverizer (accurately weighed to 0.0001 g), put it into a gas generating bottle, add 100 mL of 40% sodium hydroxide solution preheated to 50 ° C, and connect the nitrogen blowing device. The generated gas was introduced into 50 mL of 5% silver nitrate solution, and nitrogen was blown for 10 minutes. Then use a glass crucible with a constant weight in a constant temperature drying oven at 105°C±2°C to filter the silver nitrate solution. After filtering the supernatant, transfer all the precipitated residue to the filter with a small amount of water. Dry the filter with residue in a constant temperature drying oven at 105°C±2°C for 1 hour, take it out and move it into a desiccator, cool to room temperature, and weigh. Repeat drying, cooling, and weighing until the mass difference between the two weighings is ≤0.2mg.

...

Embodiment 2

[0023] Embodiment 2: Detect the precision and the rate of recovery of red phosphorus content in the resin:

[0024] Weigh 10 g of the sample pulverized by the freeze pulverizer (accurately weighed to 0.0001 g), put it into a gas generating bottle, add 100 mL of 40% sodium hydroxide solution preheated to 50 ° C, and connect the nitrogen blowing device. The generated gas was introduced into 50 mL of 5% silver nitrate solution, and nitrogen was blown for 10 minutes. Then use a glass crucible with a constant weight in a constant temperature drying oven at 105°C±2°C to filter the silver nitrate solution. After filtering the supernatant, transfer all the precipitated residue to the filter with a small amount of water. Dry the filter with residue in a constant temperature drying oven at 105°C±2°C for 1 hour, take it out and move it into a desiccator, cool to room temperature, and weigh. Repeat drying, cooling, and weighing until the mass difference between the two weighings is ≤0.2m...

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Abstract

The invention relates to a method for determining content of red phosphorus in an electronic product by a gravimetric method. The method comprises the following steps: crushing and evenly mixing a sample to be determined, and then adding concentrated alkali liquor to the sample to react with the sample to generate hydrogen phosphide. The gravimetric method is used for determining as follows: the hydrogen phosphide is absorbed by 50mL of 5% aqueous silver nitrate solution; when the reaction is completed, the obtained mixture is pre-baked to a constant-weight No.4 glass colander at 105 DEG C plus or minus 2 DEG C for filtration, and then the mixture is weighed, thus the red phosphorus content can be calculated. The method for detecting the content of the red phosphorus in the electronic product is rapid and effective, and the relative average deviation is less than 10%; therefore, the method for detecting the content of the red phosphorus in the electronic product is reliable and convenient, and can meet the research and production needs.

Description

technical field [0001] The invention relates to a method for measuring the content of red phosphorus in electronic products, in particular to a method for detecting the content of red phosphorus in electronic products by a gravimetric method. Background technique [0002] Red phosphorus (red phosphorus) is a simple substance of phosphorus, and it is an allotrope with white phosphorus. Red phosphorus has good flame retardant properties. It is an inorganic phosphorus flame retardant with excellent performance. It has high efficiency, smoke suppression, and low toxicity. . Phosphorous flame retardants are good substitutes when halogenated flame retardants are increasingly restricted. However, with the development of society, people's demand for green and environmental protection is gradually increasing, and they also pay more attention to their own health. The use of electronic products added with red phosphorus flame retardants is harmful to human health, so the content of ...

Claims

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Application Information

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IPC IPC(8): G01N5/00G01N31/00
Inventor 宋薇
Owner 谱尼测试集团股份有限公司
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