JPS592443B2 - resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a discharge lamp ballast that generates vibration and heat when energized;
This invention relates to a resin composition used to fill electrical equipment such as small power transformers, and provides a resin composition with excellent adhesion and vibration-proofing effects.

In general, electrical equipment such as discharge lamp ballasts and small power transformers that have built-in transformers, chokes, etc. are used to fix internal coils, resistors, etc., to prevent moisture, and to dissipate heat generated when energizing, and to prevent iron cores due to magnetostriction and magnetic force. In order to prevent vibrations caused by vibrations of coils caused by vibration and electromagnetic force, the inside of the case of electrical equipment is filled with resin or a compound containing resin and an inorganic filler.

This type of compound has (1) good adhesion to the case and no cracking, (2) good electrical insulation, (3) good heat dissipation, (4) ) It is highly elastic and can absorb noise caused by electric vibration, (5) It has good compound filling workability,
In particular, it must be able to contain a large amount of an inorganic filler with excellent heat dissipation properties, have appropriate fluidity, and have an appropriate curing speed even when cured at room temperature; (6) Compatibility with various insulating materials. Various properties are required, such as good properties.

Conventionally, as this type of compound, a compound in which an inorganic filler is blended with an unsaturated polyester resin, which is well-balanced in terms of price and properties, has been used.

However, when ordinary unsaturated polyester resin is injected into the case and cured, it shrinks during curing, resulting in poor adhesion to the case, making the ballast noise louder, cracking easily, and lacking moisture resistance. It was hot. In addition, noise from the ballast cannot be prevented because the hardened filling material is hard and cannot absorb the vibrations of the core caused by the magnetic force.

In view of this current situation, the inventors of the present invention have made extensive studies to correct the drawbacks of resins mentioned above. As a result, they have developed a resin that has excellent adhesion to the case and is flexible, without sacrificing the features of conventional unsaturated polyester resin. We have completed a resin composition that is highly elastic and has an excellent vibration-damping effect, and that can sufficiently exhibit its characteristics even when cured at room temperature.

That is, the present invention uses 10 to 20 equivalent % of synchropentanenyl monomaleate and 20 to 30 equivalent % of saturated dibasic acid.
, 10-20 fatty acids having at least one double bond
40-80% by weight of unsaturated alkyd obtained by reacting % by weight and 50-60% by weight of polyhydric alcohol (.A)
The present invention relates to a resin composition containing 20 to 60% by weight (B) of a polymerizable vinyl monomer.

Syncropentanenyl monomaleate can be obtained by reacting syncropentadiene, maleic anhydride, and water or syncropentadiene and maleic acid.

The reaction temperature is 150°C or lower. Reaction temperature is 150℃
If it exceeds 100%, synchlopentadiene is thermally decomposed into cyclopentadiene and added to the double bond of maleic acid, resulting in a decrease in the degree of unsaturation of the polyester, which adversely affects the curability and electrical properties. Synchropentadiene, maleic anhydride, and water are reacted in approximately equimolar amounts, and in the case of reaction of synclopentadiene and maleic acid, they are also reacted in approximately equimolar amounts.

Due to the strong dissociative nature of the primary carboxylic acid of maleic acid, an addition reaction between synchropentadiene and the primary carboxyl group of maleic acid takes place in the absence of a catalyst, yielding synclopentanenyl monomaleate.

When water and maleic anhydride are used, maleic acid is first produced and the above reaction occurs.

In addition, maleic acid partially transfers to fumaric acid above its melting point, and fumaric acid is difficult to undergo an addition reaction with synchropentadiene in the absence of a catalyst, so to prevent fumarization, the reaction temperature should be 140°C or lower. is desirable.

The excellent adhesion in the present invention is largely due to the use of synchropentanenyl monomaleate. The amount of synchropentanenyl monomaleate can be practically used if it is 10 to 20 equivalent % based on the unsaturated alkyd, and preferably 10 to 15 equivalent %. 10
If it is less than 20 equivalent %, the curability and adhesion will be poor, and if it exceeds 20 equivalent %, the resulting compound will be too hard, lose its flexibility, and have a poor vibration damping effect.

As the saturated dibasic acid in the present invention, phthalic anhydride, phthalic acid, adipic acid, a mixture thereof, etc. can be used, and the amount thereof is 20 to 30% relative to the unsaturated alkyd in terms of curability, adhesion, and hardness. Equivalent %. If it is less than 20 equivalent%, the resulting cured product will not have sufficient vibration damping properties;
If it exceeds , the electrical insulation properties will be poor.

Further, as the fatty acid having at least one double bond, soybean oil fatty acid, linseed oil fatty acid, dehydrated castor oil fatty acid, tung oil fatty acid, and mixtures thereof are used.

Monoglycerides such as soybean oil, linseed oil, dehydrated castor oil, tung oil, and mixtures thereof may be used in combination with the fatty acids. The amount of this fatty acid is set to 10 to 20 equivalent % based on the unsaturated alkyd from the viewpoint of the vibration-proofing effect of the cured product, the electrical insulation properties, and the curability of the composition. As the polyhydric alcohol used in the unsaturated alkyd in the present invention, polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1,6-hexanediol, mixtures thereof, etc. are used. .

The reason why the polyhydric alcohol is contained in an amount of 50 to 60 equivalent % based on the unsaturated alkyd is to prevent the unsaturated alkyd from becoming cloudy and having a low molecular weight.

The amount of polyhydric alcohol used is in excess of 0 to 30 equivalent % based on the acid component.

Preferably 5 to 20 equivalent %〇In addition, the unsaturated alkyd (.A) can be prepared by adjusting the acid value and viscosity using a melting method or a solvent method (xylene, toluene, etc.) in the same way as the method for synthesizing ordinary unsaturated polyester resins. can be obtained by managing
A known catalyst may be used if necessary.

A resin composition is obtained by dissolving 40 to 80% by weight of the unsaturated alkyd thus obtained in 20 to 60% by weight of a polymerizable vinyl monomer such as styrene or vinyltoluene.

If the content of the polymerizable vinyl monomer is less than 20% by weight, the viscosity of the unsaturated polyester resin will increase, making it impossible to incorporate a large amount of inorganic filler, resulting in a decrease in heat dissipation.

If the content of the polymerizable vinyl monomer exceeds 60% by weight, copolymerizability with unsaturated alkyds decreases, making it impossible to obtain a resin composition with excellent crack resistance. If necessary, a curing catalyst, a curing accelerator, a polymerization inhibitor, an inorganic filler, etc. may be added to the resin composition of the present invention in commonly used amounts.

As the curing catalyst, methyl ethyl ketone peroxide, benzoyl peroxide, cyclohexanone peroxide, cumene hydroperoxide, dicumyl peroxide, tert-butyl peroxide, etc. can be used.

The curing accelerator may be any substance that decomposes peroxide by redox reaction and facilitates generation of active radicals, such as organic metal salts such as naphthenates of cobalt, manganese, lead, etc. Examples include dimethylaniline. As a curing method, a method of curing at room temperature or by heating using the above-mentioned curing catalyst and curing accelerator is applied.

As the polymerization inhibitor, commonly used ones such as quinones such as hydroquinone, p-benzoquinone, pyrogallol, and catechol are used.

Examples of the inorganic filler include silica sand, calcium carbonate, silica, hydrated alumina, river sand, and agarite, and talc and the like may be added as an anti-settling agent.

The particle size of these inorganic fillers can be arbitrarily selected, and fillers with different particle sizes or different types of fillers may be combined. Since the moisture content of these fillers deteriorates the insulation coating of enamelled copper wires used in coils of electrical equipment, it is better to keep it as low as possible, and it is preferably controlled to 0.15% by weight or less. When the curing temperature of the compound is in the range of room temperature to 120°C, a cured product with excellent flexibility, adhesion, and vibration-proofing effect can be obtained.

The resin composition of the present invention is mainly suitable for casting.

Next, the present invention will be explained using Examples and Comparative Examples.

Parts or percentages refer to parts or percentages by weight.

Example 1 277 parts of synchropentadiene, 206 parts of maleic anhydride
1 part and 41 parts of water were reacted at 140°C for 2 hours in a nitrogen gas stream to synthesize synchropentanenyl monomaleate, to which 207 parts of phthalic anhydride, 392 parts of soybean oil fatty acid and 266 parts of propylene glycol were added. A dehydration condensation reaction is carried out according to a conventional method at 150 to 210°C in a nitrogen gas stream, and 1000 parts of the resulting resin is mixed with 0.0 parts of hydroquinone.
It was dissolved in 540 parts of styrene monomer containing 2%, and 0.7% of 6% cobalt octenoate and 0.03% of dimethylaniline were added to the total composition.

The resulting composition was designated as resin composition a. Example 2 227 parts of synchropentadiene and 244 parts of maleic acid were reacted in a nitrogen gas stream at 140°C for 2 hours to synthesize synchropentanenyl monomaleate, which was then mixed with 468 parts of diethylene glycol, 343 parts of soybean oil fatty acid, and linseed oil. 147 parts of fatty acid, 153 parts of adipic acid, and 155 parts of phthalic anhydride are added, and a dehydration condensation reaction is carried out in a nitrogen gas stream at 150 to 210°C according to a conventional method.

1,500 parts of the obtained resin was dissolved in 910 parts of styrene monomer containing 0.02% of hydroquinone, and 0.7% of 6% cobalt octenoate and 0.03% of dimethylaniline were added to the total composition. The resulting composition was used as resin composition b.
And so. Example 3 558 parts of synchropentanenyl monomaleate synthesized in the same manner as in Example 1, 188 parts of propylene glycol
parts, diethylene glycol 239 parts, adipic acid 274 parts
56 parts of phthalic anhydride, 420 parts of soybean oil fatty acid, and 105 parts of linseed oil fatty acid were subjected to a dehydration condensation reaction in a nitrogen stream at 150 to 210°C according to a conventional method to obtain a resin of 1600 parts.
0.02(f) of styrene monomer JMoV0 containing 0.02(f) of hydroquinone, 6% cobalt octenoate (0.7Cf1), 0.07% dimethylaniline based on the total composition.
was added.

The resulting composition was designated as resin composition c. Comparative example 1 609 parts of propylene glycol, 40 parts of dilopylene glycol
2 parts, 392 parts of maleic anhydride, and 888 parts of phthalic anhydride were subjected to a dehydration condensation reaction at 150 to 210°C in a nitrogen gas stream, and 2000 parts of the resulting resin was mixed with 0.0 parts of hydroquinone.
0.5% of 6% cobalt octenoate was added to the total composition by dissolving it in 2000 parts of styrene monomer containing 1%.

The resulting composition was designated as resin composition d. Comparative Example 2 660 parts of dicyclopentadienyl monomale, 1.3 parts of propylene glycol 9, 8.3 parts of trimethylolpropane 5, and 2.7 parts of soybean oil fatty acid 18 were heated at 150 to 210°C in a nitrogen gas stream. A dehydration condensation reaction was carried out, and the obtained resin 800V was dissolved in 430 parts of styrene monomer containing 0.02% of hydroquinone, and 0.5% of 6% cobalt octenoate was added to the total composition.

The resulting composition was designated as resin composition e. Example 1 above
~3. To 100 parts by weight of the resin compositions a-e obtained in Comparative Examples 1 and 2, 1 part by weight each of methyl ethyl ketone peroxide was added in the case of room temperature curing, and 1 part by weight of cyclohexanone peroxide was added in the case of heat curing, and then silica sand was added as the main component. 350 parts of an inorganic filler (H-122, trade name manufactured by Hyōsangyo Co., Ltd.) was added and the uniformly mixed compound was injected into a 40W two-lamp fluorescent lamp ballast of the Rabbit Star type, and the mixture was heated under specified conditions. hardened with.

After curing, Table 1 shows the adhesion between the ballast compound and the case and the results of a popping sound test. To measure the noise when installing the fixture, set the above ballast to a fixture for two 40W lights, attach it to a plywood board with a thickness of 12 mm, turn it on, and place the microphone of a sound level meter at a distance of 10 mm from the fluorescent light. was set and the noise was measured. The hardness of the compound was measured using a Shore hardness meter.

The resin composition of the present invention improves the adhesion to the case, which has been considered a drawback of conventional unsaturated polyester resin compositions, and also improves the vibration damping effect by softening the compound and giving it elasticity. , discharge lamp ballasts, small power transformers, etc. can be made to have lower noise levels.

Claims (1)

[Claims] 1 Dicyclopentadienyl monomaleate 10-20
40-80% by weight of an unsaturated alkyd obtained by reacting 20-30% by weight of a saturated dibasic acid, 10-20% by weight of a fatty acid having at least one double bond, and 50-60% by weight of a polyhydric alcohol. A resin composition containing (A) and 20 to 60% by weight of a polymerizable vinyl monomer (B).