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Method for determining content of platinum in fluorine polymer

A technology of fluoropolymer and determination method, which is applied in the field of chemical analysis, can solve the problems of low platinum element content determination, inability to use and difficult to dissolve, etc., and achieve the effect of convenient and quick digestion and improved accuracy

Active Publication Date: 2019-06-28
深圳怡诚新材料有限公司
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Problems solved by technology

[0033] The purpose of the present invention is to provide a method for determining the content of platinum in fluoropolymers, aiming at solving the problem that the method for determining the content of platinum in solid samples in the existing ICP-OES atomic emission spectrometry analysis has low platinum content and cannot be used for Problems with poorly soluble platinum-containing fluoropolymers

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  • Method for determining content of platinum in fluorine polymer
  • Method for determining content of platinum in fluorine polymer
  • Method for determining content of platinum in fluorine polymer

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specific Embodiment

[0054] In the above step S03, the platinum element is detected on the solution sample to be tested by using the ICP-OES method, which can be carried out by using a commonly used ICP-OES testing instrument on the market. As a specific embodiment, the ICP-OES test instrument adopts the German SPECTRO ARCOS full-spectrum direct-reading plasma emission spectrometer; the ICP-OES test conditions are:

[0055] Instrument parameters: observation height 2mm; atomizer flow rate 0.75L / min; power: 1430W; plasma gas 12L / min; auxiliary gas flow rate 0.9L / min; reference wavelength, platinum 214.423nm.

[0056] In the examples of the present invention, the platinum content in the fluoropolymer is determined by a fluorine gas high-temperature dynamic digestion device. preferred, such as figure 1 As shown, the high-temperature dynamic digestion device includes a combustion system 1 and an ash collection system 3 communicated through a calcium fluoride glass tube 2, wherein the combustion syste...

Embodiment 1

[0066] Preparation of standard solution:

[0067] Use the above-mentioned 1000mg / L platinum standard solution to dilute step by step to 0.1mg / L, 0.2mg / L, 0.5mg / L, 1.0mg / L as the standard solution, and draw the platinum content to make a standard curve, such as figure 2 shown. The linear coefficient of the standard curve is 0.99986, and the detection limit is 0.0025mg / L (solution concentration).

Embodiment 2

[0069] A method for measuring platinum content in fluoropolymers, said method is high-temperature dynamic digestion of fluorine gas, comprising the following steps:

[0070] S21. First pass 30% fluorine-nitrogen mixed gas into the digestion device at a flow rate of 20ml / min, and then heat the temperature of the heating zone to around 2500°C; The gas burns rapidly, and the fluoropolymer turns into carbon tetrafluoride, hydrogen fluoride and other gases at high temperature and is burned;

[0071] S22. After the sample is burned, use 100ml of aqua regia to dissolve and clean, the combustion chamber, the glass tube, the collection bottle, and the condenser tube 32 to prepare a solution sample to be tested containing platinum solution;

[0072] S23. Using the ICP-OES method to detect the platinum element in the solution sample to be tested, and obtain the content of the platinum element in the sample. The ICP-OES test instrument adopts the German SPECTRO ARCOS full-spectrum direct...

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Abstract

The invention provides a method for determining content of platinum in a fluorine polymer. The method comprises the following steps that fluorine / nitrogen mixed gas is used to pre-treat a solid sampleto be determined under the heating condition; ash constituents of the pre-treated sample is dissolved by an inorganic acid to obtain a solution sample to be determined; and an ICP-OES method is usedto detect platinum element in the solution sample to be determined, and the content of platinum in the sample is obtained. Via the provided method, the fluorine contained polymer hard to dissolve is dissolved fully, the detection accuracy is improved, the defect that the detected platinum content is relatively low when the fluorine contained polymer is treated by a present dissolving method is overcome, and the method can be suitable for detecting the platinum content in a polytetrafluoroethylene material and a fluorine contained anti-fingerprint paint.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis, in particular to a method for determining platinum content in fluoropolymers. Background technique [0002] Fluoropolymers are polymer materials developed for military purposes in the 1940s. With the advancement of science and technology, fluoropolymers have been greatly developed, and their application fields have also expanded rapidly. The research on fluoropolymers began at Dupont Company in the United States, which first developed polytetrafluoroethylene (PTFE) (R.J.Plunkett, US Pat. 2230654, 1939.), which opened the prelude to the research on fluoropolymers. In 1946, PTFE products began to emerge in the market. In the 1960s, fluorine coatings based on polytetrafluoroethylene were applied to cooking products, and the prepared non-stick pans and other cookware achieved good market effects. Subsequently, coatings based on polyvinylidene fluoride (PVDF) occupy an important position i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73G01N1/44G01N1/28
Inventor 方福全周济苍南军义谢亮
Owner 深圳怡诚新材料有限公司
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