A kind of quantitative detection method of polypropylene beta crystal form nucleating agent

A quantitative detection method and β-crystal technology, applied in the field of analytical chemistry, can solve the problems of unsuitability for rapid and batch detection, high technical requirements for operators, expensive equipment and other problems, to reduce detection costs, low technical requirements, The effect of reducing sample loss

Active Publication Date: 2021-03-12
SHANXI CHEM RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The former has expensive equipment, high maintenance costs, and high technical requirements for operators, so it cannot be popularized in plastic processing production lines; although the latter has lower requirements for operators, the sample digestion process requires high temperature, long digestion time, and requires Distillation, absorption and other cumbersome steps are not suitable for rapid and batch detection

Method used

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  • A kind of quantitative detection method of polypropylene beta crystal form nucleating agent
  • A kind of quantitative detection method of polypropylene beta crystal form nucleating agent
  • A kind of quantitative detection method of polypropylene beta crystal form nucleating agent

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Weigh 0.5 g (β-nucleating agent 1 or 2 or 3) solid sample, accurate to 0.0001 g, put it in a polytetrafluoroethylene high-pressure digestion tank, add catalyst Cu, carefully add 15 mL of sulfuric acid, and tightly cover the digestion tank , after 30 min of cold digestion, the reaction gas was released. Transfer the digestion tank to a high-temperature oven, set the reaction temperature to 200 °C, and react for 40 min. After the reaction is complete, close the oven, and take out the high-pressure digestion tank after the oven cools down naturally. In a fume hood, deflate slowly until the gas is exhausted. Neutralize the remaining solution with sodium hydroxide solution (400 g / L), filter, and dilute the filtrate to 500 mL with water. Take 1 mL of the above water sample into a 50 mL colorimetric tube, and add water to volume. Add 1.0 mL potassium sodium tartrate solution and 1.5 mL Nessler's reagent respectively, and shake well. Stand for 10 min, and measure the absorb...

Embodiment 2

[0027] Weigh 0.5 g (β-nucleating agent 1) solid sample, accurate to 0.0001 g, put it in a polytetrafluoroethylene high-pressure digestion tank, add the catalyst (copper oxide or copper sulfate powder), and carefully add 15 mL of sulfuric acid , Cover the digestion tank tightly, and after 30 minutes of cold digestion, release the reaction gas. Transfer the digestion tank to a high-temperature oven, set the reaction temperature to 200 °C, and react for 40 min. After the reaction is complete, close the oven, and take out the high-pressure digestion tank after the oven cools down naturally. In a fume hood, deflate slowly until the gas is exhausted. Neutralize the remaining solution with sodium hydroxide solution (400 g / L), filter, and dilute the filtrate to 500 mL with water. Take 1 mL of the above water sample into a 50 mL colorimetric tube, and add water to volume. Add 1.0 mL potassium sodium tartrate solution and 1.5 mL Nessler's reagent respectively, and shake well. Stand ...

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Abstract

The invention relates to a quantitative detection method for a beta crystal nucleating agent of polypropylene, which belongs to the field of analytical chemistry. The invention discloses a method for quantitatively detecting the nucleating agent of beta crystal form of polypropylene, which is to digest the nucleating agent with sulfuric acid in the presence of a catalyst. After neutralization with sodium hydroxide, the content of ammonia nitrogen was measured by Nessler's reagent spectrophotometry. The invention is applied in the field of nucleating agents for the first time, and the method does not require solvents, is simple and convenient to operate, has low requirements on the technical level of operators, short detection period, and economical cost, and is suitable for rapid and batch quantitative analysis of products on plastic processing production lines.

Description

technical field [0001] The invention relates to a quantitative detection method for a beta crystal nucleating agent of polypropylene, which belongs to the field of analytical chemistry. Background technique [0002] Polypropylene β crystal nucleating agent plays a prominent role in optimizing the impact strength and heat distortion temperature of polypropylene products. Studies have shown that the purity of the nucleating agent directly affects the performance of the product. However, during the detection process, it was found that the β-nucleating agent is difficult to dissolve in organic solvents, so modern qualitative and quantitative detection techniques (such as liquid chromatography, gas chromatography, etc.) cannot be used to quantify its purity. [0003] The nucleating agents of β crystal form are mainly imide compounds. Therefore, the quantitative analysis of β nucleating agents can be realized by establishing a quantitative analysis and detection method for nitrog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 王克智林福华张国才代燕琴薛晓虎薛周桁张惠芳毛晨曦张建军李训刚王冉刘凤玉李少阳张鸿宇李向阳巩翼龙王凯王晶王晨杨树竹唐钰
Owner SHANXI CHEM RES INST
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