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Polyolefin composite insulating material with high thermal-oxidative stability and preparation method thereof

A composite insulation and polyolefin technology, applied in the direction of insulators, organic insulators, plastic/resin/wax insulators, etc., can solve the problems of affecting the service life of polyolefin materials, low molecular weight of antioxidants, migration, etc., to reduce internal defects , low dielectric constant, and the effect of reducing interface polarization

Active Publication Date: 2016-04-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used antioxidants have low molecular weight, will be partially volatilized during high temperature processing, and will also migrate during use, thus affecting the service life of polyolefin materials

Method used

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  • Polyolefin composite insulating material with high thermal-oxidative stability and preparation method thereof
  • Polyolefin composite insulating material with high thermal-oxidative stability and preparation method thereof
  • Polyolefin composite insulating material with high thermal-oxidative stability and preparation method thereof

Examples

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Embodiment 1

[0042] This embodiment relates to a polyolefin composite insulation material with high thermo-oxidative stability, the composite material is made of 98% by mass fraction of polyethylene as a matrix and 2% by mass fraction of polydopamine-coated antioxidant functionalized graphite oxide Alkenes are used as fillers. The preparation process of polydopamine-coated antioxidant functionalized graphene oxide is as follows: figure 1 shown, prepared by the following steps:

[0043]A. Chemical exfoliation of graphene: According to the improved Hummer'sMethod reported in the literature (G.Q.Shi, et al., J.Am.Chem.Soc., 2008, 130, 5856.), graphite oxide was prepared by chemical exfoliation alkene;

[0044] B. Activation of antioxidants: Dissolve antioxidants in methanol and react with ethylenediamine to obtain activated antioxidants. The solid-to-liquid ratio (g / ml) of the antioxidant to ethylenediamine is 1:3 to 5, and 1:4 is selected in this embodiment; the antioxidant is 3-(3,5-di-t...

Embodiment 2

[0053] This embodiment relates to a polyolefin composite insulation material with high thermal oxygen stability, the composite material is made of 98.5% by mass fraction of polypropylene as a matrix and 1.5% by mass fraction of polydopamine-coated antioxidant functionalized graphite oxide Alkenes are used as fillers. Wherein the preparation of the antioxidant functionalized graphene oxide coated with polydopamine is the same as in Example 1, the difference is: in step B, the solid-to-liquid ratio (g / ml) of the antioxidant and ethylenediamine 1:3, the antioxidant is 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid; in step C, the amount of the activated antioxidant is graphene oxide quality 20% of.

[0054] This embodiment also relates to a method for preparing a polyolefin composite insulating material with high thermo-oxygen stability, the method comprising the following steps:

[0055] Step 1, adding 4.925g of polypropylene polymer matrix to 52mL of toluene solution, s...

Embodiment 3

[0060] This example relates to a polyolefin composite insulation material with high thermo-oxidative stability, the composite material is functionalized with 99% by mass fraction of ethylene-propylene copolymer as a matrix and 1% by mass fraction of polydopamine-coated antioxidant Graphene oxide is used as filler composition. Wherein the preparation step of the antioxidant functionalized graphene oxide coated with polydopamine is the same as in Example 1, the difference is: in step B, the solid-to-liquid ratio (g / ml) of the antioxidant and ethylenediamine ) is 1:5, and the antioxidant is 3-(3,5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate; in step C, the activated antioxidant The consumption is 35% of graphene oxide quality. The antioxidant is.

[0061] This embodiment also relates to a method for preparing a polyolefin composite insulating material with high thermo-oxygen stability, the method comprising the following steps:

[0062] Step 1, adding 4.95g of the et...

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Abstract

The invention discloses a polyolefin composite insulating material with the high thermal-oxidative stability and a preparation method thereof. The polyolefin composite insulating material is prepared from, by mass, 98%-99.5% of a polyolefin polymer matrix and 0.5%-2% of modified graphene oxide packing, wherein antioxidant-functionalized graphene oxide coated with polydopamine is adopted as the modified graphene oxide; through a grafted antioxidant, the thermal-oxidative stability of the material can be improved, and the graphene oxide can play a role in inhibiting migration of the antioxidant. By adopting the modified graphene oxide, not only can the interface bonding force between the polymer matrix and the packing be enhanced, but also the graphene oxide can be prevented from being deep reduced in the preparation process of the composite insulating material, and therefore the composite material keeps the good insulating property. The prepared polyolefin composite insulating material with the high thermal-oxidative stability has the advantages of being long in oxidation induction time, low in dielectric constant and dielectric loss and the like and is suitable for electric wire and cable insulating materials.

Description

technical field [0001] The invention belongs to the technical field of electrical and electronic material preparation, and relates to a polymer electrical insulating material, in particular to a polyolefin composite insulating material with high thermal oxygen stability and a preparation method thereof. Background technique [0002] Polyolefin materials have low dielectric constant, low dielectric loss, high breakdown strength, excellent mechanical properties and chemical resistance, and are widely used in wire and cable insulation. During processing and use, polyolefins are susceptible to aging and degradation under the action of heat and oxygen. Therefore, antioxidants and the like are usually added during the preparation process to improve its service life. The commonly used antioxidants have low molecular weight, will be partially volatilized during high-temperature processing, and will also migrate during use, thus affecting the service life of polyolefin materials. ...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/12C08L23/16C08L23/08C08K9/10C08K9/04C08K3/04C08K5/134C08K5/13H01B3/44
CPCC08K3/04C08K5/13C08K5/1345C08K9/04C08K9/10C08L2201/08C08L2203/20H01B3/441C08L23/06C08L23/12C08L23/0815
Inventor 黄兴溢卜晶江平开张军
Owner SHANGHAI JIAO TONG UNIV
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