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Preparation method of reference material for analysis of UV absorber content in polystyrene plastic

A polystyrene plastic and reference substance technology, which is applied in the direction of material separation, material analysis, and measurement devices, can solve problems such as uneven agglomeration, poor uniformity between additives and polymer matrix, and reference substances that do not have the value of analysis and testing. , to achieve the effect of overcoming uneven dispersion and avoiding the decomposition of additives

Inactive Publication Date: 2014-06-25
珠海出入境检验检疫局检验检疫技术中心
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, we know that the solid-state blending method has great disadvantages. The uniformity between the additive and the polymer matrix is ​​often poor, which leads to uneven phenomena such as agglomeration.
The existence of these problems makes the prepared reference materials not have the corresponding analytical test use value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of preparation method of ultraviolet absorber content reference substance in polystyrene plastics, comprises the following steps:

[0021] 1) Remove the polymerization inhibitor in styrene monomer

[0022] Take 500mL of analytically pure styrene in a separatory funnel, wash with 50mL of 10wt% sodium hydroxide solution three times, and then wash twice with an equal volume of water. After the second water wash, filter the styrene through a Buchner funnel (Φ67 mm) filled with a layer of anhydrous sodium sulfate with a thickness of 1 cm at the bottom of the filter paper, and pour the filtered styrene into a brown reagent bottle in a refrigerator at 4°C;

[0023] 2) Addition of target ultraviolet absorber to be tested

[0024] UV absorber (UV-531 (2-hydroxy-4-n-octyloxybenzophenone, CAS No.1843-05-6)) was added to the treated styrene monomer to make concentrations of 20g / L, 2 g / L, 0.2g / L solutions, transfer the solution to a large-mouth glass bottle sealed with a s...

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Abstract

The invention discloses a preparation method of a reference material for analysis of UV absorber content in polystyrene plastic, which comprises the following steps of : 1) removing and analysizing a polymerization inhibitor in a pure styrene monomer; 2) dissolving a target UV absorbing additive in the obtained styrene monomer in the previous step, dispersing sufficiently to prepare solution with gradient concentration; 3) prepolymerizing the obtained solution in the previous step; and 4) molding and polymerizing the product obtained in the the previous step. According to the invention, the process adopts a means adding the UV absorbing additive to styrene monomer to disperse sufficiently to form uniform solution. The subsequent prepolymerization and molding polymerization ways enable the UV absorber to be dispersed in polystyrene matrix uniformly, overcome the problem of uneven dispersion of additive in matrix caused by blending and also avoids the problem of decomposition of UV absorber. The product obtained by the process can be used to determine the analysis experiment of content and migration of the UV absorbing additive in food contacting polymer material.

Description

Technical field [0001] The invention involves the preparation method of reference substances in a polystyrene plastic content. Background technique [0002] The existing plastic analysis is mainly used for polyethylene (PE) or polypropylene (PP) material.Planting or blown physical processing methods. [0003] However, we know that there are great disadvantages of solid -state mixing methods. The uniformity between the auxiliary and the polymer matrix is often poor, resulting in uneven phenomenon such as reunion.The existence of these problems makes the prepared reference substances do not have corresponding analysis and test value. Invention content [0004] The purpose of the present invention is to provide a preparation method for analyzing the content of ultraviolet absorbers based on polyophenylene plastic. [0005] The technical solution adopted by the present invention is: [0006] An analysis of the content of ultraviolet absorbers in a polystyrene plastic uses the prepar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F112/08C08F2/44G01N30/88
Inventor 陈朝方李忠彭彬徐泽伍利兵陈晶宏廖佳陈小清罗玉玮曹乃斌王平利张国兵刘健
Owner 珠海出入境检验检疫局检验检疫技术中心