Polypropylene cable insulating material as well as preparation method and application thereof

A cable insulation and polypropylene technology, which is applied in the field of electrical and electronic material preparation, can solve the problems of reducing the electrical performance of cables and low anti-oxidation efficiency, and achieve the effects of improving service life, improving compatibility, and high oxidation induction period.

Inactive Publication Date: 2020-07-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current problems are: on the one hand, when the amount of antioxidant added is low, the anti-oxidation efficiency is low, and the effect of increasing the service life of the cable is not obvious; when the amount of antioxidant added is high, the electrical performance of the cable is greatly reduced

Method used

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  • Polypropylene cable insulating material as well as preparation method and application thereof
  • Polypropylene cable insulating material as well as preparation method and application thereof
  • Polypropylene cable insulating material as well as preparation method and application thereof

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preparation example Construction

[0033] The invention provides a preparation method of a high thermal oxygen stability polypropylene cable insulation material, said method comprising the steps of:

[0034] A. Knead the isotactic polypropylene particles on a two-roller machine for 10 minutes to fully melt them, and set the temperature to 200°C;

[0035] B. Suspend the mixing, mix the antioxidant powder with polypropylene, so that the antioxidant is fully melted in the isotactic polypropylene;

[0036] C. Continue to fully knead the mixture on a two-roller machine for 15 minutes, set the temperature at 200°C, and then cut it into several parts, each 1-2g;

[0037] D. Degas the mixed material, cool it, and hot press it on the tablet press

[0038] Preferably, the hot pressing method described in step C has the following steps:

[0039] A. Take a portion of the mixed material and place it in a mold with a diameter of 70mm and a depth of 70 / 250μm;

[0040] B. Hot press the mixed material in the tablet machine f...

Embodiment 1

[0044] This embodiment relates to a polypropylene cable insulating material with high thermo-oxidative stability. The polypropylene composite insulating material comprises 99.7% polypropylene matrix and 0.3% thiobisphenol compound filler based on 100% mass fraction. Wherein the preparation method of the polypropylene cable insulation material of high thermo-oxygen stability is as follows:

[0045] A. Mix 29.91g of isotactic polypropylene particles on a two-roller machine for 10 minutes to fully melt them, and set the temperature to 200°C;

[0046] B. Suspend mixing, mix 0.09g 4,4'-thiobis(6-tert-butyl-3-methylphenol) and 4,4'-thiobis-(2-methyl-6-tertbutyl Base phenol) is mixed with isotactic polypropylene respectively, so that it is fully melted in isotactic polypropylene;

[0047] C. Continue to fully knead the mixture on a two-roller machine for 15 minutes, set the temperature at 200°C, and then cut it into several parts, each 1-2g;

[0048] D. Degas the mixed material, co...

Embodiment 2

[0050] This embodiment relates to a polypropylene cable insulating material with high thermo-oxidative stability. The polypropylene composite insulating material comprises 99.5% polypropylene matrix and 0.5% thiobisphenol compound filler in terms of mass fraction of 100%. Other steps are with embodiment 1.

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Abstract

The invention discloses a polypropylene cable insulating material as well as a preparation method and application thereof. The polypropylene cable insulating material is prepared from, taking the massamount of the polypropylene cable insulating material as 100%, 99.5 to 99.9% of a polypropylene matrix and 0.1 to 0.5% of thio bisphenol compound filler. Wherein the thio bisphenol compound comprisesa hindered phenol unit and a sulfur-containing unit, the hindered phenol unit can capture free radicals generated in a matrix through proton transfer, and the sulfur-containing unit can efficiently decompose a hydroperoxide into a harmless product. The polypropylene cable insulating material with high thermal oxidation stability prepared by the invention has the characteristics of long oxidationinduction period, high direct-current breakdown strength, difficulty in accumulation of space charges and the like, and is suitable for high-voltage direct-current cables.

Description

technical field [0001] The invention belongs to the technical field of electrical and electronic material preparation, and in particular relates to a polypropylene cable insulation material and its preparation method and application. Background technique [0002] Polypropylene is an environmentally friendly high-voltage DC cable insulation material. Compared with traditional cross-linked polyethylene insulation materials, it has the advantages of high operating temperature, low electrical conductivity, high breakdown strength, and not easy to accumulate space charges. However, polypropylene materials are prone to aging under the action of heat, oxygen, light, etc., which reduces the breakdown field strength and shortens the service life. Therefore, it is necessary to add antioxidants to polypropylene materials. [0003] The current problems are: on the one hand, when the amount of antioxidant added is low, the anti-oxidation efficiency is low, and the effect of increasing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K5/375H01B3/44
CPCC08K5/375C08K2201/014C08L2201/08C08L2203/202C08L2207/10H01B3/441C08L23/12
Inventor 杜伯学刘畅李忠磊
Owner TIANJIN UNIV
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