KR20000060306A - Improvements in and relating to Anti-tracking property in polyolefin compounds - Google Patents

Abstract

PURPOSE: A polyolefinic composition is provided, that is improved in an anti-tracking property and can be used for a high voltage insulating cable by maintaining consistently a tensile strength, the coefficient of expansion, and a volume intrinsic resistance. CONSTITUTION: The polyolefinic composition comprises 100 pts.wt. of a base polymer being either an alone of the polyolefinic elastomer or a blend of polyolefinic thermoplastic resin and polyolefinic elastomer; 10 to 200 pts.wt. of metal hydroxide as a tracking filler; 1 to 20 pts.wt. of metal oxide; 1 to 20 pts.wt. of a silane coupling agent; and 0.2 to 5 pts.wt. of an antioxidant. When the polyolefinic composition accompanies a crosslinking reaction including a chemical and irradiation crosslinking, the composition contains 1 to 3 pts.wt. of peroxide in the chemical crosslinking and 0.5 to 3 pts.wt. of an irradiation crosslinkage coagent in the irradiation crosslinking.

Description

Polyolefin composition with improved tracking resistance {Improvements in and relating to Anti-tracking property in polyolefin compounds}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to polyolefin compounds used for high voltage insulation, and more particularly to polyolefin compositions having improved anti-tracking properties.

Polluted moisture and fog in the atmosphere interact with salts, dust and ionic contaminants to cause leakage currents to flow to the surface of the insulator, thereby raising the temperature to evaporate the moisture to create a dry band on the surface of the insulator. Electrical stress flows through this band and eventually causes a discharge or spark above the breakdown stress.

The spark is so hot that it decomposes the surface to form carbonaceous spots, making the tracks in the form of branches and losing the function of the insulator.

In order to alleviate this phenomenon, when the metal hydroxide is added to the polyolefin-based compound, the surface of the metal hydroxide releases moisture by the flame of high temperature, and the metal hydroxide remains in the metal oxide state, thereby alleviating the tracking phenomenon.

Therefore, conventionally, polyolefin-based compounds having anti-tracking characteristics are usually tracked by using metal hydroxides such as Al (OH) ₃ or Mg (OH) ₂ and metal oxides such as Fe ₂ O ₃ and SiO _2. It is improving sex.

However, in the case of a polyolefin-based compound having improved tracking resistance through a metal hydroxide or a metal oxide, improvement in tracking resistance is not satisfactory.

Accordingly, the present invention has been made in accordance with the conventional technical request as described above, an object of the present invention is to provide an electrically stabilized composition while suppressing the tracking characteristics as much as possible.

The polyolefin composition of the present invention for achieving the above object is a blend of a polyolefin thermoplastic resin and a polyolefin elastomer or 100 parts by weight of the base polymer of the polyolefin elastomer alone, 10 to 200 parts by weight of metal hydroxide as a tracking filler, metal oxide 1-20 parts by weight, 1-20 parts by weight of the silane coupling agent, and 0.2-5 parts by weight of the antioxidant.

Other objects and advantages of the invention will be described below and will be appreciated by the practice of the invention. Furthermore, the objects and advantages of the present invention can be realized by means and combinations indicated in the appended claims.

The inventors of the present invention suggest that when a silane coupling agent is added to a polyolefin-based compound using a metal hydroxide or a metal oxide as a tracking filler, a silane coupling agent having both an inorganic reactor and an organic reactor may be an inorganic filler or It has been found that it is possible to obtain an electrically stabilized composition by acting on the polarity of the base compound to improve the miscibility of the mixture.

In addition, such a silane coupling agent may obtain an effect of suppressing tracking by alleviating the adsorption of electrically polar contaminants such as ionic materials.

The present invention blends a polyolefin-based thermoplastic resin and a polyolefin-based elastomer or 100 parts by weight of the base polymer of the polyolefin-based elastomer alone, 10 to 200 parts by weight of metal hydroxide as a tracking filler, 1 to 20 parts by weight of metal oxide, silane coupling agent 1 20 parts by weight and 0.2 to 5 parts by weight of an antioxidant.

When crosslinking reaction is involved, a crosslinking aid is included. In the case of chemical crosslinking, 1 to 3 parts by weight of peroxide is added, and in the case of irradiation crosslinking, 0.5 to 3 parts by weight of crosslinking aid is added.

Al (OH) ₃ or Mg (OH) ₂ is used as the metal hydroxide to be applied to the present invention, and Fe ₂ O ₃ is preferably used as the metal oxide.

The silane coupling agent used in the present invention improves the tracking resistance while maintaining or improving other physical properties of the base compound.

The silane coupling agent of this invention uses a vinyl type, an epoxy type, methacryloxy type, and an amino type coupling agent.

Vinyl-based vinyl vinyl trichloro silane (vinyltrichloro silane), vinyl trimethoxy silane (vinyltrimetoxy silane), vinyl triethoxy silane (vinyltrietoxy silane), vinyl tri (β- methoxy ethoxy) silane (vinyltri (β-metoxy etoxy) silane) is used.

As an epoxy type, (beta)-(3,4 epoxy cyclohexyl) ethyl triepoxy silane, (gamma)-glycidoxy propyl trimethoxy silane, (gamma)-glycidoxy propylmethyl diethoxy silane, (gamma)-glycidoxy propyl triethoxy silane Etc. are used.

As a methacryloxy type, (gamma) -methacryloxy propylmethyl diethoxy silane, (gamma) -methacryloxy propyl triethoxy silane, (gamma)-methacryloxy propyl triethoxy silane, etc. are used.

As an amino system, N- (beta) (amino ethyl) (gamma) -amino propyl methyl dimethoxy silane, N- (beta) (amino ethyl) (gamma)-amino propyl trimethoxy silane, and N- (beta) (amino ethyl) (gamma)-amino propyl methyl diethoxy silane , γ-amino propyltrimethoxy silane, γ-amino propylmethyltriethoxy silane, N-phenyl-γ-amino propyltrimethoxy silane and the like are used.

In addition, γ-chloro propyltrimethoxy silane and γ-mercapto propyltrimethoxy silane and the like can be used.

Hereinafter, the composition of Examples and Comparative Examples according to the present invention will be described through Table 1, and the measurement results for the physical properties thereof will be disclosed in Table 2.

<Table 1>

(Unit: parts by weight)

<Table 2>

As can be seen from Table 2, the embodiment of the present invention can be seen that the tracking resistance is significantly improved compared to the comparative example.

The present invention significantly improves the tracking resistance while maintaining the same physical properties of the composition used for high voltage insulation, such as tensile strength, elongation, and volume resistivity.

Claims (10)

100 parts by weight of a polyolefin-based thermoplastic resin and a polyolefin elastomer or 100 parts by weight of a base polymer of a polyolefin elastomer alone, 10 to 200 parts by weight of a metal hydroxide as a tracking filler, 1 to 20 parts by weight of a metal oxide, and 1 to 20 parts by weight of a silane coupling agent. Part, Polyolefin-based composition comprising 0.2 to 5 parts by weight of an antioxidant. The method of claim 1, When the polyolefin-based composition is accompanied by a crosslinking reaction, in the case of chemical crosslinking, 1-3 parts by weight of peroxide is added, and in the case of irradiation crosslinking, 0.5-3 parts by weight of a crosslinking aid is added. . The method of claim 1, The metal hydroxide is Al (OH) ₃ or Mg (OH) ₂ Polyolefin-based composition, characterized in that. The method of claim 1, Polyolefin-based composition, characterized in that the metal oxide is Fe ₂ O ₃ . The method according to claim 3 or 4, Said silane coupling agent is any of vinyl type, epoxy type, methacryloxy type, and amino type, The polyolefin type composition characterized by the above-mentioned. The method of claim 5, The vinyl coupling agent may be vinyltrichloro silane, vinyltrimethoxy silane, vinyltriethoxy silane, vinyl tri (β-methoxy ethoxy) silane (vinyltri (β) -metoxy etoxy) silane) polyolefin-based composition, characterized in that. The method of claim 5, The epoxy coupling agent is β- (3,4 epoxy cyclohexyl) ethyltriepoxy silane, γ-glycidoxy propyltrimethoxy silane, γ-glycidoxy propylmethyldiethoxy silane, γ-glycidoxy propyl tree It is an ethoxy silane, The polyolefin type composition characterized by the above-mentioned. The method of claim 5, Said methacryloxy coupling agent is (gamma) -methacryloxy propylmethyl diethoxy silane, (gamma) -methacryloxy propyl triethoxy silane, and (gamma) -methacryloxy propyl triethoxy silane, The polyolefin type composition characterized by the above-mentioned. The method of claim 5, The amano-based coupling agent is N-β (aminoethyl) γ-amino propylmethyldimethoxy silane, N-β (aminoethyl) γ-amino propyltrimethoxy silane, N-β (aminoethyl) γ-amino propylmethyl It is diethoxy silane, (gamma) -amino propyl trimethoxy silane, (gamma) -amino propylmethyl triethoxy silane, and N-phenyl- (gamma)-amino propyl trimethoxy silane, The polyolefin type composition characterized by the above-mentioned. The method according to claim 3 or 4, The silane coupling agent is γ-chloro propyltrimethoxy silane or γ-mercapto propyltrimethoxy silane, characterized in that the polyolefin-based composition.