Method for rapid detecting ISO 9080 grade of PVC pipe material

An ISO9080, polyethylene pipe technology, applied in the grade field, can solve the problems that have not been practically applied, and achieve the effect of a wide range of applications

Inactive Publication Date: 2007-08-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] More and more experiments and molecular simulations support the theoretically predicted existence of crystalline and amorphous interface phases, such as the article "Evidence for a PartiallyOrdered Component in Polyethylene from Wide-angle X-ray Diffraction" by A.M.E.Baker and A.H.Windle (Polymer 2002, 42, 667), article "The Sructure of Crystalline Polymers" by L. Mandelkem (Acc.Chem.Res. 1990, 23, 380), article "Study of Polyethylene by Solid State NMR Relaxation and Spin Diffusion" (Macromolecules 1997, 30, 2474), but this theory has not been practically applied so far

Method used

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  • Method for rapid detecting ISO 9080 grade of PVC pipe material
  • Method for rapid detecting ISO 9080 grade of PVC pipe material
  • Method for rapid detecting ISO 9080 grade of PVC pipe material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Grade determination of different PE pipe materials by solid-state proton nuclear magnetic spectrum analysis technology

[0034] The powders of the two kinds of pipe material resins, the NMR broad-line hydrogen spectrum and the three-phase analysis of the hydrogen spectrum are shown in Figure 1 and Figure 2, respectively. The mass fractions of the three phases are given by the integral area fractions corresponding to the model curves, and the results are shown in Table 1.

[0035] Table 1 The phase content analysis results of two samples of PE1 and PE2 by solid-state NMR broad-line proton spectrum

[0036]

sample

Phase content

Crystalline phase

interface phase

Amorphous phase

PE1

PE2

0.84

0.97

0.14

0

0.02

0.03

[0037] * The result error is not more than 3%.

[0038] According to the results in Table 1, it can be judged that the pipe material corresponding to...

Embodiment 2

[0039] Example 2 Raman Spectroscopy Analysis Technology for Grade Judgment of Different Tube Materials

[0040] When using Raman spectroscopy to analyze the phase structure of solid polyethylene pipes, the basis is 1200cm -1 to 1600cm -1 Peak analysis of the spectrum in the C-H bond torsional vibration and bending vibration regions in the region [13]. The contents of crystalline phase, amorphous phase and interface phase are calculated by the following formulas respectively:

[0041] Crystal phase contentX C = I 1416 / [0.46(I 1295 +I 1303 )]

[0042] Amorphous phase contentX a =I1303 / (I 1295 +I 1303 )

[0043] Interface phase contentX i =1-X c -X a

[0044] Where I refers to the integral area of ​​the spectrum peak, which is given by the computer peak division result.

[0045] The results of the analysis of the two polyethylene phase structures are shown in Table 2:

[0046] Table 2 Raman spectroscopy phase content analysis results of PE1 and PE2 samples

[00...

Embodiment 3

[0050] Example 3 The combination of wide-angle X-ray and DSC analysis technology to determine the grade of different grades of pipe materials

[0051] The wide-angle X-ray (WAXD) method can analyze the phase structure of solid polymers, and the obtained crystalline phase content includes the contribution of the interface phase, and the crystallinity given by DSC technology is approximately equivalent to the highly ordered molecular chain content of the crystalline phase. The difference in crystallinity given by the two test methods reflects the content of the interfacial phase in the solid material, from which the three-phase composition in the polyethylene pipe resin can be distinguished. The analysis and test results of the two samples of PE1 and PE2 are shown in the table 3 shows:

[0052] Table 3 Phase composition analysis of PE pipe materials by WAXD and DSC combined technology

[0053]

[0054] Comparing the results of Examples 1, 2, and 3, it can be found th...

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Abstract

The invention discloses a method to quickly detect polyethylene pipe material rank of ISO9080, it includes (1) detect polyethylene pipe material structure distribution in condensation state, the structure distribution in condensation state includes mass per centum content distribution of crystal phase, interface phase and amorphism phase;(2)compute the mass per centum content distribution of crystal phase, interface phase and amorphism phase;(3) bases the result of the (2)step, process the ISO9080 ratings of the polyethylene pipe material: the mass per centum content of crystal phase is 50-90%for polyethylene pipe material with PE80 rank and more than it, the mass per centum content of interface phase is 5-45%, the mass per centum content of amorphism phase is 0-15%. Compared to pipe certification authority hydrostatic test rating, This method has advantages of convenient, fast, and saving money, accelerate the new pipe material products into research development process, and with high accuracy, wide adaptation.

Description

technical field [0001] The invention relates to a method for evaluating and grading the performance of polyethylene pipe materials, in particular to a method for quickly detecting the ISO9080 grade of polyethylene pipe materials. technical background [0002] Since 1980, polyethylene pipes have been widely used in water and gas transportation, especially after the Kobe earthquake in Japan in 1995, the superiority of PE pipes has been widely recognized by the world. Today, in the gas field, whether it is for the repair and renewal of new laying or old pipelines, polyethylene pipes are one of the main choices. The polyethylene buried gas pipeline is reliable in quality, safe in operation, easy to maintain and economical in cost. [0003] The grading of PE pipe materials is the basis for the application of PE pipes. When grading PE pipes, it is necessary to perform hydrostatic tests for at least 9,000 hours under the three temperature conditions of 20°C, 60°C and 80°C in acco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/44G01N35/00
Inventor 阳永荣严小伟王靖岱历伟蒋斌波
Owner ZHEJIANG UNIV
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