JPS5845214A - Resin composition for electrical insulation - Google Patents

Abstract

PURPOSE:To prepare the titled composition having excellent curability in air, electrical characteristics at high temperature, mechanical properties, and heat resistance, by mixing an unsaturated polyester resin with tris(2-hydroxyethyl)isocyanuric acid diacrylate, etc. at a specific ratio. CONSTITUTION:The objective resin composition is obtained by mixing and stirring (A) 100pts.wt. of an unsaturated polyester resin with (B) 3-50pts.wt. of tris(2-hydroxyethyl)isocyanuric acid diacrylate, triacrylate, dimethacrylate, or trimethacrylate. The unsaturated polyester resin can be prepared by reacting an acid component (e.g. maleic acid) with an alcohol component (e.g. propylene glycol) and if necessary a modifying component (e.g. linseed oil), and dissolving the reaction product in a crosslinkable monomer (e.g. styrene). USE:Impregnation varnish and casting varnish for electrical insulation.

Description

[Detailed description of the invention] Unsaturated polyester resin is mechanical and electrical.

Because it is relatively well-balanced in terms of thermal properties, workability, price, etc., it is used for various purposes.It is also used for insulation, as it has excellent workability, so it can be used for coil impregnation,
It is often used for casting.

However, when used as a coil varnish or casting varnish, conventional unsaturated polyester resins cannot be used.

Since stickiness remains on the surface of the cured product, six methods have been used to prevent this problem. For example, in a casting face, a small amount of solid wax may be added, each acrylate or methacrylate may be added as an air-curing agent, and ether-type glycol, dihydrophthalic acid, vegetable oil, etc. may be added as an unsaturated polyester component. I degenerated and took countermeasures.

On the other hand, for coil impregnation, generally 80 to 150
Since solid wax is cured by heating at ℃, solid wax is ineffective, and even if the above modification method improves air curability, it does not necessarily yield a resin composition with sufficient electrical properties at high temperatures, mechanical properties, heat resistance, etc. I couldn't.

The inventors are concerned with the improvement of these properties.

As a result of extensive research, we found that it has excellent air curing properties.

In addition, we have invented an electrically insulating resin composition that has excellent high-temperature electrical properties (1) mechanical properties and heat resistance.

The electrically insulating resin composition of the present invention comprises 100 parts by weight of an unsaturated polyester resin and 3 to 50 parts of diacrylate, triacrylate, dimethacrylate or trimethacrylate of tris(2-hydroxyethyl)incyanuric acid.
]1 [71 copies.

The present invention relates to an electrically insulating tree composition having preferably 5 to 30 layers.

The resin composition of the present invention can obtain sufficient properties simply by stirring and mixing at room temperature or while heating.

Next, the materials used in the present invention will be described in detail.

The unsaturated polyester resin used is one obtained by reacting a 9th order acid component, an alcohol component, and, if necessary, a modifying component and dissolving it in a crosslinkable monomer.

Acid components include maleic acid, maleic anhydride/acid, unsaturated acids such as fumaric acid, phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, and tetrahydrophthalic anhydride.

Saturated acids such as hexahydrophthalic acid, hexahydrophthalic anhydride, adipic acid, and cepatic acid.

Fatty acids obtained from soybean oil, linseed oil, tall oil, etc. are used.

As the alcohol component, propylene glycol, ethylene glycol, diglobylene glycol, diethylene glycol, 1.3 phthanediol, neopentyl glycol, 1.6 hexane glycol, glycerin, trimethylolpropane, pentaerythritol, etc. are used.

Additionally, linseed oil is added as a modified ingredient if necessary.

Soybean oil, tall oil, dehydrated castor oil, coconut oil, dicyclopentadiene, cyclopentagenate are used.

Diacrylate, triacrylate, dimethacrylate or trimethacrylate of tris(2-hydroxyethyl)isocyanuric acid.

For example, tris-hydroxyethyl isocyanuric acid and acrylic acid or methacrylic acid, a sulfuric acid.

It is produced by reacting in a nitrogen stream for 3 to 5 hours in a solvent such as toluene in the presence of a catalyst such as phenothiazine. Approximately 2 to 3 moles of acrylic acid or methacrylic acid are reacted per mole of tris(2-hydroxyethyl)isocyanuzJl.

For curing the resin composition of the present invention, curing agents include acyl peroxides such as benzoyl peroxide and acetyl peroxide, and hydroperoxides such as tert-butyl peroxide and cumenehydrobamioxide.

Ketone peroxides such as methyl ethyl ketone peroxide and cyclohexanone peroxide, and ditertiary butyl peroxide.

Dialkyl peroxides such as dicumyl peroxide, oxyperoxides such as tert-butyl peroxyacetate, etc. can be used.

The amount of curing agent added is generally in the range of 0.5 to 5 parts by weight, preferably 1 to 3 parts by weight, per 100 parts by weight of the resinous composition.

Furthermore, naphthenic acid or octenoic acid metal salts (such as cobalt, manganese, iron, lead, etc.), which are generally used as curing accelerators, can be used when curing the resin composition of the present invention, and the amount added is per 100 weight of the resin composition. It can be used in a range of 0 to 5 parts by weight.

As the crosslinkable monomer, styrene and its WI conductor,
Divinylbenzene, acrylic esters or methacrylic esters, various allyl esters, various allyl ethers, etc. are used.

The amount used is preferably in the range of 30 to 70 parts by weight based on the resin composition.

Furthermore, if necessary, quinones such as hydroquinone, paratertiary butylcatechol, pyrogallol, and other commonly used quinones can be used as monopolymerization inhibitors, and the amount added is as follows: 0
The range is 0.1 part by weight.

The present invention will be described in detail. Parts are by weight.

Example 1, Production of unsaturated polyester resin A 35 parts of soybean oil fatty acid, 10 parts of tetrahydrophthalic anhydride, 15 parts of maleic anhydride, 20 parts of dipropylene glycol
parts, diethylene glycol 20 parts, hydroquinone 0.
02 parts was heated to 150°C for 1 hour, then raised to 210°C over 5 hours, and heated and cotton-combined at 210°C for 4 hours to obtain an acid value of 22.5.
An unsaturated polyester was synthesized. 5.0 parts of this unsaturated polyester was stirred and dissolved in 50 parts of styrene monomer to produce unsaturated polyester resin A.

2 Production of unsaturated polyester resin B Maleic anhydride fi 15.0 parts, isophthalic acid 37.0 parts, propylene glycol 48.0 parts, hydroquinone 0
．． 02 parts were heated to 150° C. for 1 hour, the temperature was raised to 220° C. over 6 hours, and the mixture was fed at 220° C. for 4 hours to synthesize an unsaturated polyester having an acid value of 25.2. This unsaturated polyester 6
0 part was stirred and dissolved in 40 parts of styrene monomer to produce unsaturated polyester resin B.

Triacrylate (FA731A manufactured by Hitachi Chemical) or trimethacrylate (FA731M manufactured by Hitachi Chemical) of the unsaturated polyester resin A obtained above and (tris-hydroxyethyl in 2B) IJ incyanuric acid^
was blended with the composition shown in Table 1, and 1.0 parts by weight of manganese 8thinaphthenate was added to form an aI fat composition.

According to JIS C2105 Solvent-free resin for electrical insulation.

The properties of the resin composition and its cured product were measured. The results are shown in Table 1.

From Table 1 below, the electrically insulating resin compositions (7fL2-6 and A9-13) that are examples of the present invention have long drying times and improved volume resistivity and adhesive strength at 9,100°C. Moreover, the resinous composition of the present invention, which has a small loss on heating, is shown to be effective as a varnish for impregnating electrically insulating coils and a varnish for casting.

Claims (1)

[Claims] 1. Unsaturated polyester resin 100 radio wave part and Tris (
Diacrylate and triacrylate of 2-hydroxyethyl)incyanuric acid. An electrically insulating resin composition containing 3 to 50 parts of dimethacrylate or trimethacrylate.