Method for stably detecting content of antioxidant 168

A stable detection and anti-oxidant technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problem of low addition amount, and achieve the effect of strong adaptability and simple conversion

Pending Publication Date: 2019-03-19
广东省医疗器械质量监督检验所
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Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a method for stably detecting the content of antioxidant 168, which avoids the problem that the detection result will be lower than the actual amount added due to the oxidation of antioxidant 168 in the polymer production process

Method used

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  • Method for stably detecting content of antioxidant 168
  • Method for stably detecting content of antioxidant 168
  • Method for stably detecting content of antioxidant 168

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Embodiment 1

[0022] A method for stably detecting the content of antioxidant 168, comprising the steps of: measuring the content of antioxidant 168 and antioxidant 168 oxides in the detection matrix, and the content of antioxidant 168 is based on the determined content of antioxidant 168 and the content of antioxidant 168 Oxygen 168 oxide content calculation.

[0023] Antioxidant 168 has a phosphorous acid structure and is extremely unstable. In a stability investigation, the content of antioxidant 168 dropped sharply by 50% after 24 hours, and the prepared liquid needed to be put on the machine within 1 hour, which brought great trouble to the content detection. Through the research, the content of the antioxidant 168 oxide (tris(2,4-di-tert-butylphenyl)phosphate) was observed to increase continuously by using the self-made method. Through the conversion superposition of the two and the correction of 168 oxide, the sum of the concentration of 168 and 168 oxide can maintain a relatively s...

Embodiment 2

[0036] A method for stably detecting the content of antioxidant 168, comprising the steps of: measuring the content of antioxidant 168 and antioxidant 168 oxides in the detection matrix, and the content of antioxidant 168 is based on the determined content of antioxidant 168 and the content of antioxidant 168 Oxygen 168 oxide content calculation.

[0037] The present invention uses liquid chromatography to respectively measure the content of antioxidant 168 and antioxidant 168 oxides in the detection matrix, and the liquid chromatography conditions are: chromatographic column: C18, 5μm, 4.6mm×250mm; mobile phase: water: tetrahydrofuran: acetonitrile = 1:3:6, flow rate: 1.5ml / min; wavelength: 280nm for quantification of antioxidant 168, 266nm for antioxidant 168 Quantification of oxides; injection volume: 20 μl. The present invention selects dual-wavelength quantification, selects different wavelengths for antioxidant 168 oxide and antioxidant 168 for quantification, obtains ...

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Abstract

A method for stably detecting content of an antioxidant 168 includes the steps of determining content of the antioxidant 168 and content of oxide of the antioxidant 168 of a to-be-tested substrate, wherein the content of antioxidant 168 is calculated according to the determined contents of the antioxidant 168 and oxide of the antioxidant 168. With joint detection of the antioxidant 168 and the oxidant thereof, the problem that it is difficult to detect content of the antioxidant 168 due to the unstable property thereof is solved. The method has prospectiveness since it has not been introducedto the domestic industrial standard; the method has no need to change original chromatographic condition and has high adaptability and simple conversion; besides polyethylene and polypropylene products, the method can also be applied to development of various medicinal preparations, with good results achieved.

Description

technical field [0001] The invention relates to the field of content detection, in particular to a method for stably detecting the content of antioxidant 168. Background technique [0002] Tris(2,4-di-tert-butylphenyl)phosphite (hereinafter referred to as Antioxidant 168) is one of the most widely used antioxidants in the field of plastic infusions, and is generally used in combination with main antioxidants 1010 and 1076 , has an excellent synergistic effect. It can effectively prevent the thermal degradation of polypropylene and polyethylene in basic injection molding, and give the polymer additional long-term protection. The oxidation mechanism is to achieve the purpose of anti-oxidation by decomposing the peroxide produced by further degradation of plastics. [0003] GB / T25277-2010 Determination of phenolic antioxidants and erucamide slip agents in plastic homopolypropylene (PP-H) by liquid chromatography, European Pharmacopoeia 3.1.3 Polyolefins and other standards ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06
Inventor 方旻曲亚南颜林谢新艺黄梓为
Owner 广东省医疗器械质量监督检验所
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