JP2000154312A - Resin composition for electric insulation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a resin composition for electric insulation, having improved crack resistance. SOLUTION: This resin composition for electric insulation consists essentially of (A) an unsaturated polyester, (B) a xylene resin, and (C) a reactive monomer selected from an acrylic ester, a methacrylic ester, and a derivative thereof, and obtained by blending a monomer α having <=140 molecular weight and a monomer β having >=200 molecular weight. The amounts of each compounded components are 95-30 pts.wt. unsaturated polyester A, 5-70 pts.wt. xylene resin B, and 40-300 pts.wt. reactive monomer C based on 100 pts.wt. total of the resin components A and B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a modified unsaturated polyester resin composition having a low viscosity and excellent in crack resistance and adhesion as compared with conventional resin compositions of the same type, and is used for fluorescent lamps. The present invention relates to a resin composition for electrical insulation suitable for being embedded in a ballast.

[0002]

2. Description of the Related Art Conventionally, a method of using a resin composition containing flexible unsaturated polyester as a main component and styrene as a reactive monomer has been used for casting insulation of a fluorescent lamp ballast housed in a case. General.

[0003] In recent years, ballasts are often used outdoors. In this case, the temperature difference between when the ballast is operating and when it is stopped is large, and the temperature difference between seasons is large, so that the ballast is subjected to intense cold heat. Cases are increasing.

[0004] Further, even in indoor applications, ballasts have been miniaturized, and the number of times of operation and stoppage has increased, so that intense cooling heat has been added in many cases as in the case of outdoors.

[0005]

Under such severe operating conditions, the ballast may cause cracks due to cold or heat deterioration and cause a rare shot, so that an improvement in crack resistance has been demanded.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a resin composition for electric insulation with improved crack resistance.

[0007]

Means for Solving the Problems As a result of intensive studies aimed at achieving the above object, the present inventor combined unsaturated polyester and xylene resin as described later and obtained two kinds of reactive monomers. It has been found that the addition of a body improves crack resistance, and the present invention has been completed.

That is, the present invention relates to a monomer selected from (A) an unsaturated polyester, (B) a xylene resin, and (C) an acrylic ester, a methacrylic ester and a derivative thereof, and having a molecular weight of 140 As an essential component, a reactive monomer in which the following monomer α and a monomer β having a molecular weight of 200 or more are blended, 95 to 30 parts by weight of the unsaturated polyester (A) and 5 to 5 parts of the xylene resin (B)
To 70 parts by weight, and 40 to 3 parts by weight of the reactive monomer (C) based on 100 parts by weight of the resin component [(A) + (B)].
A resin composition for electrical insulation characterized by being blended in a ratio of 00 parts by weight.

Hereinafter, the present invention will be described in detail.

The unsaturated polyester (A) used in the present invention is obtained by adding an acid component and an alcohol component and reacting them. As the acidic component used here, maleic acid, maleic anhydride, unsaturated acids such as fumaric acid and phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic acid, Saturated acids such as hexahydrophthalic anhydride and adipic acid are listed, and these can be used alone or as a mixture of two or more.

The alcohol component includes propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, 1,3-butanediol,
Neopentyl glycol, glycerin, pentaerythritol, tris (2-hydroxyethyl) isocyanurate, polyether polyalcohol and the like can be mentioned, and these can be used alone or in combination of two or more.

The unsaturated polyester resin can be modified, if necessary, by adding a modifying component other than the thermosetting polyester resin. Modifying components other than the thermosetting polyester resin include linseed oil, soybean oil, tall oil,
Examples thereof include petroleum resins and dicyclopentadiene, and these can be used alone or in combination of two or more.
(A) The compounding ratio of the unsaturated polyester is desirably 95 to 30 parts by weight. If the amount is less than 30 parts by weight, sufficient flexibility cannot be obtained, and if it exceeds 95 parts by weight, sufficient mechanical, electrical and thermal properties cannot be obtained, which is not preferable.

The (B) xylene resin used in the present invention is obtained by condensation of xylene and aldehyde, and commercially available products such as Nicanol L, Nicanol LL,
Nicanol H, Nicanol M (trade name, manufactured by Mitsubishi Gas Chemical Company) and the like can be used, and these can be used alone or in combination of two or more. The compounding amount of the xylene resin is 5 to
It is preferred to be in the range of 70 parts by weight. Outside this range, sufficient flexibility cannot be obtained, which is not preferable.

The reactive monomer (C) used in the present invention comprises 2
Compounding different types of monomers (α, β)
Both monomers β are selected from allyl esters of acrylic esters and their derivatives and methacrylic esters and their derivatives.

Among them, the monomer α has a molecular weight of 1
40 or less, such as methyl methacrylate, ethyl methacrylate, methacrylic acid (2-hydroxyethyl), allyl methacrylate, etc., which can be used alone or in combination as the monomer α. The monomer β has a molecular weight of 200 or more, and includes alkyl methacrylate, tridecyl methacrylate, stearyl methacrylate, lauryl methacrylate, and the like.
These may be used alone or in combination as the monomer β.

As the reactive monomer (C), the monomer α
Is desirably mixed at a ratio of 30 to 70% by weight, and the monomer β is mixed at a ratio of 70 to 30% by weight. Outside this range,
It is not preferable because sufficient flexibility cannot be obtained or the curing reaction is delayed.

The mixing ratio of the reactive monomer (C), which is the sum of the monomer α and the monomer β, is 40 to 40 parts by weight based on 100 parts by weight of the above-mentioned unsaturated polyester (A) and xylene resin (B). It is desirable to mix it in a ratio of 300 parts by weight. (C) If the proportion of the reactive monomer is less than 40 parts by weight, the viscosity is high and the workability is impaired.
Exceeding the weight part is not preferred because sufficient curing reactivity and flexibility cannot be obtained.

The resin composition for electrical insulation of the present invention comprises an unsaturated polyester, a xylene resin and a reactive monomer as essential components.
If necessary, other components such as a curing agent, a curing accelerator, a polymerization inhibitor, a coloring agent, an antifoaming agent, a leveling agent, and the like can be added and compounded. Examples of the curing agent include organic peroxides, for example, benzoyl peroxide, tertiary butyl peroxide, acetyl peroxide, acyl peroxides such as methyl ethyl ketone peroxide, cumene hydride peroxide, and the like. These can be used in combination.
It is desirable to add 0.5 to 3 parts by weight of the curing agent to 100 parts by weight of the resin composition. Examples of the curing accelerator include metal salts of naphthenic acid or octylic acid (salts of cobalt, manganese, zinc, zirconium, etc.), and these can be used alone or in combination of two or more. Examples of the polymerization inhibitor include quinones such as hydroquinone, p-tert-butylcatechol, and pyrogallol, and these can be used alone or in combination of two or more.

The resin composition for electrical insulation of the present invention comprises an unsaturated polyester, a xylene resin, a reactive monomer, a curing agent,
It can be easily produced by blending a curing accelerator and other components and uniformly stirring and mixing. The resin composition for electrical insulation manufactured in this manner can be widely used in the field of electrical insulation, and is particularly suitable as a casting material for fluorescent lamp stabilizers because of its excellent crack resistance and good adhesion. can do.

[0020]

The resin composition for electrical insulation of the present invention uses a xylene resin in combination and mixes two or more reactive monomers having different molecular weights as compared with the conventional unsaturated polyester resin composition. Thereby, the crack resistance was able to be improved.

[0021]

Now, the present invention will be described in further detail with reference to Examples. However, it should be understood that the present invention is by no means restricted by such specific Examples. In the following Examples and Comparative Examples, “parts” means “parts by weight”.

[Production of Modified Unsaturated Polyester Resin] A-1 0.07 part of hydroquinone was added to 7 parts of phthalic anhydride, 54 parts of soybean oil, 14 parts of pentaerythritol, 14 parts of maleic anhydride and 11 parts of propylene glycol. In addition, the reaction was performed at 180 to 210 ° C. to obtain a resin having an acid value of 25. Hydroquinone 0.01 was added to the obtained resin.
Parts were blended.

A-2 Tetrahydrophthalic anhydride 14
Parts, maleic anhydride 22 parts, soybean fatty acid 24 parts, ethylene glycol 22 parts, diethylene glycol 14 parts, and glycerin 4 parts, 0.02 part of hydroquinone was added and reacted at 180 to 210 ° C. to give a resin having an acid value of 25. Obtained. 0.01 part of hydroquinone was further added to the obtained resin.

Examples 1 to 3 The compositions shown in Table 1 were blended and sufficiently stirred to produce a resin composition.

COMPARATIVE EXAMPLE The compositions shown in Table 1 were blended and sufficiently stirred to produce a resin composition.

Crack resistance tests were performed using the resin compositions produced in Examples 1 to 3 and Comparative Example. The results are shown in Table 1. The present invention was excellent, and the effect was able to be confirmed.

The test method for crack resistance is as follows. A flat washer having a diameter of 10 mm was allowed to stand at the center of the metal dish, and 20 g of resin was poured into the dish and cured at room temperature for 24 hours to obtain a test piece. Using a dry ice / IPA solution on the low-temperature side and a drier on the high-temperature side, a cooling / heating cycle test was performed under the conditions shown in Table 2 to check for the occurrence of cracks.

[0028]

[Table 1]

[0029]

[Table 2]

[0030]

As is apparent from the above description and Table 1, the resin composition for electrical insulation of the present invention has excellent crack resistance as compared with the conventional resin composition, It is suitable for casting electrical insulation equipment such as ballasts for use.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H01B 3/44 H01B 3/44 PF term (Reference) 4J002 CE00X CF21W EH076 GQ01 4J027 AB02 AB06 AB07 AB15 AB16 AB17 AB18 AB19 AB23 AB24 AB25 AB28 BA02 BA07 BA08 BA12 CA10 5G305 AA13 AB16 AB34 BA09 CA02 CA12 CA55 CB08

Claims (1)

[Claims] 1. A monomer α selected from (A) an unsaturated polyester, (B) a xylene resin, and (C) an acrylate ester, a methacrylate ester and a derivative thereof, and having a molecular weight of 140 or less. And a reactive monomer in which a monomer β having a molecular weight of 200 or more is blended as an essential component.
30 parts by weight, the xylene resin of (B) is 5 to 70 parts by weight,
And the reactive monomer of (C) is the resin component [(A)
+ (B)] A resin composition for electrical insulation, which is blended in an amount of 40 to 300 parts by weight with respect to 100 parts by weight.