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Analysis method for PE pipe

An analysis method and pipe material technology, applied in the field of analysis, can solve problems such as inability to quantify components

Inactive Publication Date: 2015-03-04
上海微谱检测科技集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The PE / EVA system is mainly a mechanical blending system of PE and EVA. The main difference between PE and EVA is that PE is polymerized through the addition of ethylene, and is a high polymer chain connected by repeated -CH2- units, while EVA It is formed by random copolymerization of ethylene and vinyl acetate, and the ratio between the two components is variable. Therefore, conventional methods such as infrared and NMR cannot quantify the components in the PE / EVA system.

Method used

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  • Analysis method for PE pipe
  • Analysis method for PE pipe
  • Analysis method for PE pipe

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specific Embodiment

[0047] Raw material source:

[0048] HDPE, LDPE, LLDPE come from Iranian petrochemical industry.

[0049] EVA18-3 (VA content 18%), EVA14J4 (VA content 14%), EVA18J3 (VA content 18%), EVA6J2 (VA content 6%), EVA4F2 (VA content 4.7%), EVA12J4 (VA content 12%), EVA9F2 (VA content 9%, actual content 7.6%) and EVA K3212 (VA content 21%) are from Yanshan Petrochemical.

[0050] EVA250 (VA content 28%) and EVA560 (VA content 15%) are from DuPont.

[0051] In order to verify the universal applicability of the method of the present invention to the blending system composed of EVA of different types and different VA contents, take a beaker and weigh PE and EVA according to the scheme in the table below, add 60ml of toluene and heat to dissolve, stir evenly and dissolve the toluene Evaporate to dryness to obtain PE / EVA blend system.

[0052]

[0053] Take 0.1g of PE / EVA blend and send it for TGA test, cut the remaining PE pipe into 1mm*1mm sheet and wrap it in filter paper, record...

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Abstract

The invention relates to a method for analyzing content of EVA (Ethylene-Vinyl Acetate) in a PE (Poly Ethylene) pipe. The method comprises the following steps: providing the PE pipe to obtain a first sample to be measured, wherein the PE pipe consists of PE and EVA; analyzing the first sample to be measured by using TGA (Thermal Gravity Analysis) so as to obtain first VA (Vinyl Acetate) content; dissolving the first sample to be measured by using chloroform, separating PE from EVA, calculating to obtain mass of a dissolved matter and a solvend, and drying the solvend to obtain a second sample to be measured; analyzing the second sample to be measured by using TGA so as to obtain second VA content; calculating by the first VA content and the second VA content to obtain content of EVA in a PEEVA system.

Description

technical field [0001] The invention relates to the field of analysis, in particular to a microscopic spectrum analysis technology, in particular to an analysis method for PE pipes. Background technique [0002] PE pipe is mainly made of polyethylene as a raw material and is extruded by a plastic extruder at one time. It is a plastic pipe used in urban water supply pipe networks, irrigation water diversion projects, garbage disposal sites, sewage collection pipeline projects and agricultural sprinkler irrigation projects. Since the PE pipe is connected by hot melt and electric hot melt, the integration of the interface and the pipe is realized, and it can effectively resist the hoop stress and axial impact stress generated by internal pressure. [0003] In the prior art, the ethylene EVA blend system has good softness and a little elasticity, and the higher the proportion of PE, the worse the adhesion. By adjusting the ratio of the two chemical substances to meet differ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00
Inventor 贾梦虹卢鑫吴杰裴丽娟
Owner 上海微谱检测科技集团股份有限公司