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Method for detecting chloride ions in polyisobutylene

A technology of polyisobutylene and detection method, which is applied in the direction of electrochemical variables of materials, etc., can solve the problems of inability to directly dissolve or extract with water, and achieve the effect of high accuracy

Inactive Publication Date: 2011-11-23
SHANDONG HONGRUI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional methods such as dissolution and extraction are not suitable for polyisobutylene, because chloride ions are adsorbed and coated in organic polymer macromolecules, and cannot be directly dissolved or extracted with water

Method used

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  • Method for detecting chloride ions in polyisobutylene
  • Method for detecting chloride ions in polyisobutylene
  • Method for detecting chloride ions in polyisobutylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take 5.0g polyisobutylene sample (HRD-350), after quenching with liquid nitrogen, the sample temperature is -120~-170°C, quickly grind it in a mortar until the particle size is ≤200μm, divide the sample into five parts, and weigh the sample accurately If the weight error is ≤0.1mg, put the sample into the platinum basket combustion chamber, put it into the oxygen combustion bottle with 10.0mL water added in advance, tighten the screw cap of the oxygen combustion bottle, connect the oxygen cylinder, and pass oxygen at a flow rate of 3.0L / min for 2min. When the oxygen combustion bottle is filled with oxygen (the oxygen pressure generated should be lower than the safety pressure specified by the manufacturer), quickly disconnect the oxygen system. Put the oxygen combustion bottle containing the sample into the combustion device, close the door of the combustion device, press the "START" switch, the light source will continue to work for 10 seconds, ignite the sample and bur...

Embodiment 2

[0050] Take 5.0 g of polyisobutylene sample (HRD-550), the operation steps are the same as in Example 1, the particle size of the pretreated sample is less than 200 μm, and the measurement results are shown in Table 2.

[0051]Table 2. HRD-550 sample chloride ion determination results, sample particle size ≤ 200μm.

[0052]

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Abstract

The invention discloses a method for detecting chloride ions in polyisobutylene and belongs to a detection method of a halogen element, especially to a detection method of a chlorine element in a high-molecular polymer. The method for detecting chloride ions in polyisobutylene mainly comprises the following steps of: (1) polyisobutylene pretreatment: letting a polyisobutylene sample embrittle at low temperature in liquid nitrogen and grinding the sample into particles with the particle size being 100-200 microns; (2) letting the sample combust in an oxygen combustion bottle containing an absorption solution by charging oxygen, and letting chloride ions be fully absorbed by the absorption solution; (3) detecting the content of chloride ions in the absorption solution by the potentiometric titration method; (4) calculating the content of chloride ions in polyisobutylene. By adopting the liquid-nitrogen quenching method, polyisobutylene becomes a brittle solid and is processed into particles with small size to guarantee the complete combustion of polyisobutylene and the effective precipitation of chloride ions, so as to make it possible to precisely detect the content of chloride ions in the polyisobutylene polymer. The technical scheme provided by the invention is also suitable for the detection of chloride ions in other polyolefin polymers.

Description

technical field [0001] The invention belongs to a detection method for halogen elements, in particular to a detection method for chlorine elements in polyolefins. Background technique [0002] Chlorine is present in many polymeric materials. For the detection of chloride ions, most of them focus on the detection of chloride ions in aqueous solution. Such as chlorine ion detection in boiler water; chloride ion detection in alkaline aqueous solution; chloride ion detection in lime slurry; chloride ion detection in drinking water, and chloride ion detection in sewage, etc. The main methods are conductivity determination, potentiometric titration, conventional chemical titration, ion photometer and ion chromatography. In the above-mentioned many methods, the sample to be tested is a solution in which chlorine element exists in an ion state. For the polyisobutylene polymer of the colloid, the above-mentioned method cannot be directly adopted, and the chloride ion in the polyis...

Claims

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Application Information

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IPC IPC(8): G01N27/42
Inventor 张毅鸿朱庆增杨明哲李春晓
Owner SHANDONG HONGRUI NEW MATERIAL TECH
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