JPS5819808A - Resin composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin composition for electric field mitigation sleeves and tapes.

At the terminals and connections of high-voltage electrical cables, stress can be alleviated by using sleeves or tapes made of so-called low-impedance materials that have a high dielectric constant or low specific resistance, and cover the areas where the electric field is concentrated. Various studies are being carried out to make the terminals and connections more compact.

Various materials have been proposed as such materials having a high dielectric constant or low specific resistance, such as combinations of insulating polymers with carbon black, metal powder, titanium compounds, etc. added thereto.

However, these conventional combinations have the disadvantage that a material having the most ideal resistivity of 10<7> to 10<9> Ω-F cannot be obtained from the results of electric field analysis.

As a result of various formulation studies, we found that polyolefin-
By adding an organic tin compound to a carbon black-based material having an IQ of 11 to 1013, it was discovered through electric field analysis that a composition with a specific resistance of 107 to 109 Ω, which is considered to be ideal, could be obtained, and the present invention was developed. completed.

Example IIX sheet was prepared with the formulation shown in Table 1, and 2MeV
The dielectric constant and specific resistance of the samples were measured by irradiating them with 20 Mraclls using an accelerator, as they were, and after heating them at 160° C. for 4 days.

The results were as shown in Table 2.

In other words, if only carbon was added to the ethylene-vinyl acetate copolymer as in Comparative Examples E and F, the specific resistance would be 10.
It was not possible to obtain formulations 7-109.

D formulation with 20 parts of acetylene black added: no heating, 1
After heating at 60°C for 4 days, both values were 10111, which is too high.

The performance of formulation E containing 30 parts of acetylene black was extremely unstable, with a value of 1012.106 or less after heating at 160° C. for 4 days without heating.

, F formulation with 40 parts of acetylene black added is not heated.
106. After heating at 160°C for 4 days, the specific resistance is 10” or less, which is too low.

Various studies were conducted by changing the type of carbon black, but 10
The range of 7 to 109 was very unstable and good results could not be obtained.

We also considered using metal powder and titanium compounds, but the result was still 10.
7 to 109 were not obtained.

However, as shown in Examples A, B, and C, ethylene vinyl acetate copolymer with 20 parts of carbon black and further added with nibutyltin malate, butyltin laurate, sulfur-containing butyltin, etc., can be heated without heating. After 4 days at 160°C, stable performance was obtained at 1 fS of 8 to 109.

It was done.

According to electric field analysis, a material with a resistivity of 107 to 109 is ideal for relaxing the electric field, and since sleeves or tapes can be made from such materials and placed over areas where the electric field is concentrated, cables can be It is possible to make the terminal section and connection section of the terminal compact.

Note that, as the organic tin, in addition to the compounds used in the examples (in addition to octyltin malate, octyltin laurate, etc.), similarly good results were obtained.

Furthermore, in addition to vinyl ethyleneate copolymer, ethylene ethyl acrylate, α-olefin polymer, polybutene-1, ethylene propylene rubber, etc. are used as polymers, and carbon black and organic tin compounds are added thereto. Similarly, a stable formulation with a specific resistance of 107 to 109 Ω was obtained.

Table 1 Distribution *Butyltin malate Three-share machine synthesis■ Product name Hayashi Butyltin Laurate Three-share machine synthesis■ Product name Akira Sulfur-containing butyltin Three-share machine synthesis■ Product name Table 2 Electrical performance

Claims (2)

[Claims] (1) By adding carbon black and an organic tin compound to polyolein, the specific resistance can be increased from 10' to 109Ω.
A resin composition characterized in that it is made into "ffi". (2) f A patent claim characterized in that the tin compound is a compound selected from butyltin malate, butyltin laurate, sulfur-containing butyltin, octyltin malate, and octyltin laurate, either alone or as a blend @WiII (1) Current status @ low resin composition.