JP2737087B2 - Discharge lamp ballast - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a discharge lamp ballast excellent in low noise and heat radiation.

(Prior Art) In general, in a discharge lamp ballast, in addition to being excellent in various electrical characteristics, it is strongly required that a temperature rise is low, a humming sound is small, and the like. These characteristics largely depend on the performance of the insulator (filling material) injected between the ballast case and the so-called impedance element body. Therefore, at present, unsaturated polyester resins are widely used as the filler. However, when the ballast is used for a long time, the hardness of the unsaturated polyester resin increases, and the filler shrinks due to the peeling of the filler from the case. As a result, the heat radiation property is reduced and the growl noise is increased. Further, there is a defect that cracks are generated in the filler due to a heat cycle or the like, which may cause a fatal defect such as disconnection of the coil.

(Problems to be Solved by the Invention) The present invention has been made in order to solve the above-mentioned drawbacks, and has good adhesion of a filler, and the cured product has a long flexibility to generate cracks and the like. It is an object of the present invention to provide a discharge lamp ballast which is excellent in low noise and heat dissipation.

[Constitution of the Invention] (Means for Solving the Problems) As a result of intensive studies to achieve the above object, the present inventors have limited the content of unsaturated components in the acid component in the resin, If the discharge lamp ballast is filled with an unsaturated polyester resin composition having little change with time of the cured product by limiting the amount of the tall oil fatty acid as a component of the fatty acid and limiting the amount of addition, the above object is achieved. That is, the present invention has been completed. That is, the present invention provides: (A) an acid component comprising (a) an unsaturated polybasic acid containing tall oil fatty acid as a main component and (b) a saturated polybasic acid; (B) a polyhydric alcohol component; A polymerizable monomer, and (D) an inorganic filler, as essential components, and tall oil fatty acid as the acid component [(A)
= (A) + (b)], an unsaturated polyester resin composition containing 15 to 30 equivalent% based on the resin component [(A) + (B)], and an impedance element. A discharge lamp ballast characterized by being filled in a housed case.

The (A) acid component used in the present invention comprises (a) an unsaturated polybasic acid containing tall oil fatty acid as a main component and (b) a saturated polybasic acid.

(A) Examples of the unsaturated polybasic acid include maleic anhydride, fumaric acid, itaconic acid, citraconic acid and the like, and any of those usually used as a raw material for unsaturated polyester resins can be used. These unsaturated polybasic acids are used alone or in combination of two or more. In addition to these, tall oil fatty acids are used. Tall oil fatty acids contain relatively few double bonds and reduce the change over time in the hardness of the cured product. This is because soybean oil fatty acid has a large change in hardness with time, and coconut oil fatty acid is not preferred because the surface of the cured product sticks. Examples of the (b) saturated polybasic acid include phthalic anhydride, isophthalic acid, adipic acid, succinic acid, sebacic acid, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, endmethylenetetrahydrophthalic anhydride, and the like. These can be used alone or in combination of two or more. This saturated polybasic acid is used for substituting a part of the unsaturated polybasic acid in accordance with the required characteristics of the unsaturated polyester resin to cause a reaction.

The tall oil fatty acid is used as a partial replacement of the acid component, and its compounding ratio is the acid component [(A) = (a) +
(B)], preferably 15 to 30 equivalent%. If the proportion is less than 15 equivalent%, the curability is poor and
If it exceeds the equivalent%, the hardness of the cured product increases, and the flexibility becomes unfavorable. Further, it is desirable that the tall oil fatty acid is contained in an amount of 40 to 60% by weight based on the resin component [(A) + (B)]. If this ratio is less than 40% by weight, the initial hardness is large and the flexibility is poor, which is not preferable. If the content exceeds 60% by weight, the curability deteriorates, which is not preferable.

Any polyhydric alcohol component (B) used in the present invention can be used without limitation as long as it is used as a raw material of an unsaturated polyester resin. For example, ethylene glycol, propylene glycol, diethylene glycol, 1,
Examples thereof include 3-butanediol, 1,6-hexanediol, glycerin, pentaerythritol, neopentyl glycol and the like, and these can be used alone or as a mixture of two or more.

Examples of the (C) copolymerizable monomer used in the present invention include styrene, vinyl toluene, divinyl benzene, diallyl phthalate, methyl methacrylate, methyl acrylate, ethyl acrylate, and the like. These may be used alone or in combination of two or more. Mix and use.

As the inorganic filler (D) used in the present invention, all of those usually used as fillers can be used without any particular limitation. For example, silica powder, alumina powder, calcium carbonate, clay, gravel and the like can be mentioned, and these can be used alone or in combination of two or more.

The unsaturated polyester resin composition used in the present invention contains an acid component, a polyhydric alcohol component, a copolymerizable monomer and an inorganic filler as essential components, but if necessary, as long as it does not violate the purpose of the present invention. Other components can be added and blended. For example, there are a curing agent, a curing accelerator, a pigment and the like.
Use peroxides such as benzoyl peroxide, tert-butylperoxybenzoate, lauroyl peroxide and cumene hydroperoxide as a curing agent, and metal salts such as cobalt, manganese, lead, zinc and tin as a curing accelerator. be able to.

The unsaturated polyester resin composition used in the present invention comprises 1
Tall oil fatty acid and polyhydric alcohol are reacted in a two-stage reaction,
Next, unsaturated polybasic acid, saturated polybasic acid, and polyhydric alcohol are reacted in a two-stage reaction, and then a copolymerizable monomer is added,
Further, it can be produced by adding and kneading a curing accelerator, a curing agent, and an inorganic filler. Then, this composition is injected into a ballast containing an impedance element, filled therein, and cured by heating to form a discharge lamp ballast. The curing temperature of the composition is desirably 50 to 150 ° C. If the temperature is less than 50 ° C, the hardness becomes large, the flexibility becomes poor, and the material becomes brittle. Not preferred. A more desirable temperature range is 80-110 ° C.

(Action) In the present invention, the hardness (flexibility) of the cured product can be controlled well by reducing the amount of unsaturated polybasic acid in the acid component using tall oil fatty acid, By the degree of unsaturation and the blending of the predetermined amount, the initial hardness does not change much with the lapse of time, and an unsaturated polyester resin composition having good heat dissipation due to the effect of the inorganic filler can be obtained. By using this composition, it is possible to obtain a discharge lamp ballast having a low humming property and a good heat radiation property.

(Examples) Next, the present invention will be described with reference to examples. In the following Examples and Comparative Examples, “parts” means “parts by weight”.

Example 1 A reaction vessel equipped with a stirrer, a thermometer, a nitrogen gas inlet tube and a cooler was charged with 55.2 parts of glycerin and 168 parts of tall oil fatty acid Hartle FA20 (trade name, manufactured by Harima Kasei Co., Ltd.), and nitrogen gas was passed therethrough. While heating, take a predetermined amount of water at 180 to 210 ° C to obtain an intermediate having an acid value of 4.2, and cool to 100 ° C. 100
℃, diethylene glycol 19.1 parts, maleic anhydride 11.8 parts and tetrahydrophthalic anhydride 88.2
Was added, and the polymerization inhibitor hydroquinone was added and blended in an amount of 0.05% by weight based on the total amount. Heating was resumed, the temperature was gradually increased, and esterification was advanced at 200 to 210 ° C. to obtain an acid value of 21.
Was used as the reaction end point. Thereafter, the mixture was cooled to 100 ° C., and 200 parts of styrene was added to obtain a 60% solution. To 100 parts of this solution, 0.4 part of a 6% solution of cobalt naphthenate as a curing accelerator and 1.5 parts of methyl ethyl ketone peroxide as a curing agent were added and mixed, and then 300 parts of 200-mesh silica powder was kneaded to obtain an unsaturated polyester resin composition. I got This is 10-15
After standing for one minute, it was poured into a ballast case containing an impedance element therein, and was heated and cured at 100 ° C. for two hours to produce a rapid start ballast for two 110 W fluorescent lamps. The cured composition showed almost no shrinkage, good adhesion to the case wall, and excellent flexibility.

Using this ballast, the growling noise and the temperature rise of the coil were measured, and the results are shown in Table 1. The effect of the present invention was confirmed.

Example 2 A ballast was manufactured in the same manner as in Example 1 except that the acid value end point was changed to 18, and the ballast was tested in the same manner. The results are shown in Table 1. The effect of the present invention was confirmed.

Comparative Example A ballast was manufactured in the same manner as in Example 1 except that soybean oil fatty acid was used in place of the tall oil fatty acid, and a ballast was similarly tested. The results are shown in Table 1. Was.

[Effects of the Invention] As is clear from the above description and Table 1, the discharge lamp ballast of the present invention uses the unsaturated polyester resin composition having a specific composition to provide a close contact between the case wall and the composition. Since the cured product had good properties, the cured product had good flexibility, and there was no occurrence of cracks or the like over a long period of time, it had excellent characteristics in terms of low humming and heat radiation, and was highly reliable.

Claims (1)

(57) [Claims] 1. An acid component comprising (A) (a) an unsaturated polybasic acid containing tall oil fatty acid as a main component and (b) a saturated polybasic acid, (B) a polyhydric alcohol component, and (C) copolymerization. And (D) an inorganic filler as essential components, and tall oil fatty acid as the acid component [(A)
= (A) + (b)], an unsaturated polyester resin composition containing 15 to 30 equivalent% based on the resin component [(A) + (B)], and an impedance element. A discharge lamp stabilizer characterized by being filled in a case accommodated therein.