Method for rapidly detecting polyethylene tube special-purposed material grade

A technology of polyethylene pipes and special materials, applied in the field of grades, can solve problems such as practical application

Active Publication Date: 2013-03-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, this technology has not been prac

Method used

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  • Method for rapidly detecting polyethylene tube special-purposed material grade
  • Method for rapidly detecting polyethylene tube special-purposed material grade
  • Method for rapidly detecting polyethylene tube special-purposed material grade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 Differential Scanning Calorimetry Thermal Grading Technology for Grade Judgment of PE Pipe Material

[0020] The DSC temperature rise scanning curves of two kinds of pipe material resin powders after continuous annealing self-nucleation technology are as follows: figure 1 and figure 2 shown. The integral areas corresponding to various melting peaks of the curves are given by the integral area percentages of the corresponding model curves, and the results are shown in Table 1.

[0021] The mass percentage analysis results of different sequence lengths (different wafer thicknesses) of the two samples of Table 1 PE1 and PE2

[0022]

[0023] Note: sample 1 and sample 2 are natural color powder respectively

[0024] According to the results in Table 1, it can be judged that the pipe material corresponding to the sample PE1 is PE63 or lower, and the pipe material corresponding to the PE2 sample is PE80 or higher. This result is consistent with the labeling...

Embodiment 2

[0025] Example 2 Differential Scanning Calorimetry Thermal Grading Technology for Grade Judgment of PE Pipe Material

[0026] The DSC temperature rise scanning curves of the natural color pellets and mixed black materials of the two kinds of tube material resins after continuous annealing and self-nucleation technology are as follows: image 3 and Figure 4 shown. The integral areas corresponding to the various melting peaks of the curves are given by the integral area percentages of the respective corresponding model curves, and the results are shown in Table 2.

[0027] The mass percentage analysis results of different sequence lengths (different wafer thicknesses) of the two samples of Table 2 PE1 and PE2

[0028]

[0029] Note: Samples 1 and 1 are natural color materials of pellets; sample 2 is mixed black pellets. According to the results in Table 2, it can be judged that the pipe material corresponding to the sample PE1 is PE63 or lower grade, and the pipe material ...

Embodiment 3

[0030] Example 3 Differential scanning calorimetry thermal classification technology determines the grade of PE pipe material The powder of two kinds of pipe material resins, the DSC temperature rise scanning curve after the continuous annealing self-nucleation technology treatment is as follows Figure 5 and Image 6 shown. The integral areas corresponding to various melting peaks of the curves are given by the integral area percentages of the corresponding model curves, and the results are shown in Table 3.

[0031] Table 3 The mass percentage analysis results of the different sequence lengths (different wafer thicknesses) of the two samples of PE1 and PE2

[0032]

[0033] Note: Samples 1 and 1 are natural color materials of pellets; Sample 2 is tube sheet

[0034] According to the results in Table 3, it can be judged that the pipe material corresponding to the sample PE1 is PE63 or lower, and the pipe material corresponding to the PE2 sample is PE80 or higher. This r...

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Abstract

The invention relates to a method for rapidly detecting the grade of a polyethylene tube special-purposed material. The method comprises the steps that: (1) a sample is detected, such that a differential scanning calorimetric curve is obtained; (2) various melting peaks on the curve are divided into four groups according to a temperature no lower than 127 DEG C, a temperature of 127-120 DEG C, a temperature of 110-120 DEG C, and a temperature no higher than 110 DEG C; corresponding integral areas are calculated; weight percentages and corresponding crystallizable sequence lengths are calculated, wherein a long sequence comprises no less than 260 methylene groups, a relatively long sequence comprises 260-160 methylene groups, a non-long sequence comprises 160-90 methylene groups, and a short sequence comprises no more than 90 methylene groups; and according to the lengths of the crystallizable sequences, polyethylene tube material grading is carried out according to quality contents, wherein long sequence content is 30-86%, relatively long sequence content is 3-25%, non-long sequence content is 3-30%, and short sequence content is 0-50%. The method provided by the invention is convenient, fast, and fund-saving. With the method, tube material novel product research and development processes can be accelerated, and online detection can be carried out.

Description

technical field [0001] The invention relates to a method for performance evaluation and grading of polyethylene pipe materials, in particular to a method for quickly detecting the ISO9080 grade of polyethylene pipe materials. Background technique [0002] Special materials for polyethylene pipes refer to the raw materials used in industry, agriculture, and pressure pipes in daily life, mainly including high-density polyethylene (HDPE) and medium-density polyethylene (MDPE), which are special materials for resin manufacturers at home and abroad in recent years. focus of research and development. Due to the use of special materials for pipes to produce pipes, this type of pipes has outstanding chemical corrosion resistance, low temperature resistance, heat resistance, wear resistance, low friction coefficient, good welding performance, no pollution to the conveying medium, long service life, and low manufacturing and installation costs. Low-level excellent performance, more a...

Claims

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Application Information

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IPC IPC(8): G01N25/20
Inventor 卢晓英白玮义建军刘新元祖凤华李红明崔伟松毛静
Owner PETROCHINA CO LTD
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