JPH06176938A - Electric device insulating resin composition - Google Patents

Abstract

PURPOSE:To enhance rust-proof capability of a core and a plug by a method wherein an insulating resin composition mixing unsaturated polyester resin with nitric acid dicyclohexyl ammonium is soaked in an electric device to be insulated. CONSTITUTION:In an electric device insulating resin composition, (A) unsaturated polyester resin and (B) nitric acid dicyclohexyl ammonium are soaked and (B) components are 0.2 to 6.0 pts.wt., while (A) components are 100 pts.wt. Unsaturated polyester and a crosslinking monomer are soaked in the used (A) components. Acid components and alcohol components and further denaturation components act each other to obtain the unsaturated polyester. Also, as the crosslinking monomer, styrene, vinyltoluene, alpha-methylstyrene, tertiary butylstyrene, etc., are used. Thus, when the electric device is kept under a high humidity and an airtight condition for a long term, it is possible to prevent a generation of rust on the surface of plug of a core or a transformer of the electric device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for electrical equipment insulation treatment, and more particularly to a resin composition for electrical equipment insulation treatment which prevents rusting of metal surfaces such as motors and transformers.

[0002]

2. Description of the Related Art Unsaturated polyester resins composed of unsaturated polyester and a crosslinkable monomer are harmonized in terms of mechanical, electrical and thermal characteristics, workability and economical efficiency, and therefore FRP laminated. It is used in many applications including boards. Further, this resin is also widely used as an impregnating varnish for motors, transformers and the like because it has excellent properties and workability for electrical insulation. However, conventional motors and transformers treated with varnish are used in high humidity, or when they are stored in a closed state for a long period of time, due to moisture, oxygen, etc., the core of the motor or transformer, The metal plug for power input of the adapter transformer was rusted, which had the drawbacks of lowering the product value, increasing iron loss, and poor conduction of the plug.

[0003]

DISCLOSURE OF THE INVENTION The present invention eliminates the above-mentioned drawbacks of the prior art and prevents the rust of the core of an electric device or the input plug of a transformer from being rusted under high humidity. It is to provide things.

[0004]

Means for Solving the Problems As a result of intensive investigations, the present inventors have found that by mixing dicyclohexylammonium nitrate with an unsaturated polyester resin, the unsaturated polyester resin can be sealed under a high humidity or for a long period of time as compared with a conventional unsaturated polyester varnish. It has been found that it is possible to prevent rust from being generated on the surface of the core of an electric device or the plug surface of a transformer when stored in. The present invention is
(A) unsaturated polyester resin and (B) dicyclohexylammonium nitrate.
The present invention relates to a resin composition for electrical equipment insulation treatment, which is 0.2 to 6.0 parts by weight with respect to 100 parts by weight of components.

The component (A) used in the present invention contains an unsaturated polyester and a crosslinkable monomer. The unsaturated polyester is obtained by reacting the following acid component and alcohol component and, if necessary, a modifying component. Examples of the acid component include unsaturated acids such as maleic acid, maleic anhydride and fumaric acid, phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic acid and hexahydroanhydride. Saturated acids such as phthalic acid, adipic acid and sebacic acid, and vegetable oils and fats such as soybean oil and fats, linseed oils and fats, tall oils and fats and acids are used. As the alcohol component,
For example, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, 1,3
-Butanediol, neopentyl glycol, glycerin, trimethylolpropane, pentaerythritol and the like are used. Examples of the modifying component include linseed oil, soybean oil, tall oil, dehydrated castor oil, coconut oil, dicyclopentadiene, cyclopentadiene and the like. Examples of the crosslinkable monomer include styrene, vinyltoluene, α
-Methyl styrene, tertiary butyl styrene, divinylbenzene, various acrylic acid esters and / or methacrylic acid esters, various allyl esters, various allyl ethers, and the like. The amount of the crosslinkable monomer used is
Preferably, the total amount is 100 parts by weight and the range is 80 to 40 parts by weight with respect to 20 to 60 parts by weight of unsaturated polyester.

The component (B) used in the present invention, dicyclohexylammonium nitrate, is a known compound and can be used as a reagent or for industrial use. For industrial use, the product name Kirest T. manufactured by Kirest Co., Ltd. V. I have. The amount of dicyclohexyl ammonium nitrate used is 0.2 to 6.0 parts by weight with respect to 100 parts by weight of the component (A). Dicyclohexylammonium nitrate is 0.
If it is less than 2 parts by weight, the rust preventive effect of the core of the electric device,
In addition, the rust preventive effect of the plug of the adapter transformer is insufficient, and even if it exceeds 6.0 parts by weight, these effects are not significantly improved.

The resin composition for electrical equipment insulation treatment according to the present invention includes, as a curing agent, acyl peroxide such as benzoin peroxide and acetyl peroxide, hydroperoxide such as tertiary butyl peroxide and cumene hydroperoxide. Ketone peroxide such as oxide, methyl ethyl ketone peroxide, cyclohexanone peroxide, dialkyl peroxide such as ditertiary butyl peroxide and dicumyl peroxide, oxyperoxide such as tertiary butyl peroxyacetate, etc. are used. The amount of the curing agent added is 0.1% with respect to 100 parts by weight of the component (A).
5 to 5 parts by weight is preferable.

Further, if necessary, the accelerator and the polymerization inhibitor may be added in a usual amount. Examples of the accelerator include manganese naphthenate, lead naphthenate, cobalt naphthenate, cobalt octenoate, and the like. As the polymerization inhibitor, for example, quinones such as hydroquinone, tertiary butyl catechol and p-benzoquinone are used.

The resin composition of the present invention is applied to the insulation treatment of motors such as air conditioner fans, electric fans and washing machines, power transformers of televisions, stereos, compact disc players and the like, and adapter transformers equipped with a metal plug for power input. It

[0010]

The present invention will be described with reference to the following examples. The middle part of the following examples means parts by weight. Production Example 1 4474 parts (11 mol) of dipropylene glycol, 498 parts (3 mol) of isophthalic acid, 392 parts (4 mol) of maleic anhydride, 456 parts (3 mol) of tetrahydrophthalic anhydride and 0.22 part of hydroquinone were added. Put in a two-necked flask and heat-condense at 210 ° C for 10 hours to give an acid value of 21.5.
Of unsaturated polyester was synthesized. 40 parts of this unsaturated polyester, 60 parts of styrene, and 0.5 parts of 8% manganese naphthenate were dissolved by stirring to obtain unsaturated polyester resin A. Production Example 2 341 parts (5.5 mol) of ethylene glycol, 296 parts (2.0 mol) of phthalic anhydride, 196 parts (2.0 mol) of maleic anhydride, 560 parts (2.0 mol) of soybean oil and fatty acid.
And 0.24 parts of hydroquinone were placed in a four-necked flask and heated and condensed at 200 ° C. for 8 to 12 hours to give an acid value of 20.8.
Of unsaturated polyester was synthesized. 40 parts of this unsaturated polyester, 60 parts of styrene, and 0.5 parts of 8% manganese naphthenate were dissolved by stirring to obtain unsaturated polyester resin B.

Examples 1 to 6 Unsaturated polyester resin A or B with generalite, 30
Alternatively, 100 (toluene / formaldehyde resin manufactured by General Petrochemical Industry Co., Ltd.) and benzoyl peroxide were dissolved in a mixing ratio shown in Table 1 to obtain a resin composition of the present invention. With respect to these resin compositions, gelation time, drying time, volume resistivity, plug corrosiveness, and core rust preventive ability were evaluated by the test methods described below, and the results are shown in Table 1.

Comparative Examples 1 and 2 Benzoyl peroxide was dissolved in unsaturated polyester resin A or B at the compounding ratio shown in Table 1 and evaluated in the same manner as in Examples. The results are shown in Table 1.

Test method (1) Gelation time It was measured according to the gelation time test method of JIS C 2105. (2) Drying time The drying time was measured according to the JIS C 2105 drying time test method. (3) Volume resistivity Using a 2.0 mm resin plate which was heated and cured at 120 ° C. for 2 hours, the volume resistivity at 25 ° C. was measured according to JIS C2105. (4) Corrosion of plug An adapter transformer (core size: 48 x 45 x 25 mm) equipped with a power input plug (nickel-plated product) is dipped in the resin composition for 2 minutes and then pulled up to 10 in air.
Let stand for 1 minute and cure at 120 ° C. for 1 hour. 500 g of this varnished adapter transformer and 10 g of deionized water
Place it in a cc glass beaker and seal it as shown in FIG.
The number of days until the plug was corroded was determined by leaving it in a constant temperature bath at 0 ° C. In FIG. 1, 1 is an adapter transformer, 2 is a power input plug, 3 is ion water, and 4 is a 500 cc glass beaker. (5) Corrosion resistance of core In the test of (4), after left in a thermo-hygrostat for 5 days, the generation state of rust on the core of the power transformer was observed and evaluated according to the following criteria. ◯: No rust was generated. Δ: Rust was generated in the surface area of the core of about 10 to 20%. X: Rust was generated in the surface area of the core of about 40 to 60%.

[0014]

[Table 1]

[0015]

EFFECTS OF THE INVENTION By impregnating electric equipment with the resin composition for electric equipment insulation treatment of the present invention and performing insulation treatment, the rust preventive ability of the core and the plug is remarkably improved even under high humidity. It is possible to manufacture excellent electrical equipment.

[Brief description of drawings]

FIG. 1 is an apparatus for testing the corrosiveness of plugs performed in Examples and Comparative Examples.

[Explanation of symbols]

 1 Adapter transformer 2 Power input plug 3 Ion water 4 500cc glass beaker

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Claims (1)

[Claims] 1. An (A) unsaturated polyester resin and (B) dicyclohexylammonium nitrate are contained, and (B) component is added to 100 parts by weight of (A) component.
A resin composition for electrical equipment insulation treatment, which comprises 2 to 6.0 parts by weight.