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Method for quickly detecting crosslinked polyethylene cable insulating material structure

A technology for cross-linked polyethylene and cable insulation, which is applied in the direction of applying stable tension/pressure to test material strength, analyze materials, and measurement devices. It can solve problems such as indirect characterization methods, poor repeatability, and long experiment cycles.

Inactive Publication Date: 2011-09-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, volatile organic solvents are often used in the equilibrium swelling measurement, so the repeatability of the measurement results is poor
[0007] To sum up, although the existing characterization techniques can reflect the crystal structure and crosslinking degree of XLPE cable materials to a certain extent, there are still some characterization methods that are not direct, the combination of methods is not enough, and the experiment cycle is long. Many shortcomings such as poor repeatability

Method used

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  • Method for quickly detecting crosslinked polyethylene cable insulating material structure
  • Method for quickly detecting crosslinked polyethylene cable insulating material structure
  • Method for quickly detecting crosslinked polyethylene cable insulating material structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Put 96.7g of polyethylene PE1030, 0.3g of glycol bis-3-(3-tert-butyl-4-hydroxy-5-methylphenyl) propionate and 3.0g of dicumyl peroxide in the internal mixer , at a temperature of 110° C., 30 rpm, blended for 6 minutes, and discharged to obtain a premixed material. 10 g of the premixed material was cross-linked in a vulcanizer at a temperature of 175° C. for 10 minutes to obtain cross-linked polyethylene.

[0058] The above-mentioned cross-linked polyethylene is subjected to thermal classification analysis, and the results of the thermal classification experiment are further calculated with Thomson-Gibbs equation (1) and statistical formulas (2)-(4), and the wafer thickness distribution curve and number average of the sample are obtained. Wafer thickness L n , Weight average wafer thickness L w , Wafer distribution coefficient I, the results are shown in Tables 1 to 4 and Figure 1.

[0059] L = 2 σ ...

Embodiment 2

[0074] Put 97.8g of polyethylene PE1030, 0.2g of 2,6-di-tert-butyl-4-ethylphenol and 2.0g of 2,5-dimethyl-2,5-di-tert-butylperoxyhexane into the internal mixer , at 118° C., 50 rpm, blended for 9 minutes, and discharged to obtain a premixed material. 10 g of the premixed material was cross-linked in a vulcanizer at 170° C. for 15 minutes to obtain cross-linked polyethylene.

[0075] The above-mentioned cross-linked polyethylene was subjected to thermal classification analysis, and the Thomson-Gibbs equation (1) and statistical formulas (2)-(4) were used to further calculate the results of the thermal classification experiment to obtain the wafer thickness distribution curve and the number average of the samples. Wafer thickness L n , Weight average wafer thickness L w , Wafer distribution coefficient I, the results are shown in Tables 1 to 4 and Figure 1.

[0076] L = 2 σ Δ ...

Embodiment 3

[0091] Put 100.0 g of polyethylene PED4 in an internal mixer, blend at 115° C., 40 rpm, and discharge for 7 minutes to obtain a premixed material. 10 g of the premixed material was cross-linked in a vulcanizer at 175° C. for 10 minutes to obtain cross-linked polyethylene.

[0092] The above-mentioned cross-linked polyethylene was subjected to thermal classification analysis, and the Thomson-Gibbs equation (1) and statistical formulas (2)-(4) were used to further calculate the results of the thermal classification experiment to obtain the wafer thickness distribution curve and the number average of the samples. Wafer thickness L n , Weight average wafer thickness L w , Wafer distribution coefficient I.

[0093] L = 2 σ Δ H 0 * T m 0 ...

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Abstract

The invention discloses a method for quickly detecting a crosslinked polyethylene cable insulating material structure. The method has the characteristics that: crystallinity, wafer thickness and distribution of a crosslinked polyethylene cable material are detected by a thermal fractionation method; elasticity modulus and entanglement density of the crosslinked polyethylene cable material at a high temperature are detected by a dynamic mechanical method; and a simple and effective method for detecting the crosslinked polyethylene cable insulating material structure is provided by synthesizing the thermal fractionation method and the dynamic mechanical method. By the method, theoretical basis is provided to improve a polymerization process of a polyethylene basic material and adjust a formula of the polyethylene cable insulating material. The method is simple and convenient in test process, sensitive and accurate in result and high in repeatability.

Description

technical field [0001] The invention relates to a method for rapidly detecting the structure of cross-linked polyethylene cable insulating material, which belongs to the field of polymer structure characterization. Background technique [0002] Compared with oil-filled cables, ultra-clean XLPE insulated cables have the advantages of simple structure, fewer production processes, fast production speed, short manufacturing cycle, light weight of cables, convenient installation and use, and are conducive to large-scale production. It is difficult to solve the problem of high drop laying of cables, especially without the danger of major fires caused by oil leakage. The working temperature of the XLPE insulated cable can reach 90°C, and the cross-section of the conductor with the same ampacity can be reduced by one to two grades, which can save the conductor by 20% to 30%, and the cost is also low. Therefore, with the continuous development of the material industry and related in...

Claims

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Application Information

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IPC IPC(8): G01N25/12G01N3/08G01N9/00G01N5/04G01B21/08C08L23/06C08K5/14C08J3/24
Inventor 向明盖景刚杨峰亢健曹亚蔡燎原蓝方
Owner SICHUAN UNIV
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