KR20100040011A

KR20100040011A - Environment-friendly insulation coating composition and coating method using the same

Info

Publication number: KR20100040011A
Application number: KR1020080099039A
Authority: KR
Inventors: 고정우; 김상협
Original assignee: (주)노루페인트
Priority date: 2008-10-09
Filing date: 2008-10-09
Publication date: 2010-04-19

Abstract

PURPOSE: An insulating coating composition is provided to reduce total hydrocarbon value generated in a curing process, to improve work environment by reducing odor, and to suppress the odor generated in post heating of coated products. CONSTITUTION: An insulating coating composition comprises 100.0 parts by weight of a binder mixture containing 20-70 weight% of an unsaturated polyester resin with average molecular weight of 3,000-50,000 and the balance of a diluting agent with an acrylate group; and 0.1-5.0 parts by weight of a hardener. The insulating coating composition further comprises 10-70 parts by weight of filler based on 100.0 parts by weight of the binder mixture. The filler comprises at least one selected from the group consisting of calcium carbonate, talc, silica, aluminium hydroxide and magnesium oxide.

Description

Environment-friendly insulation coating composition and coating method using the same

The present invention relates to an insulating coating composition and a coating method using the same. More particularly, the present invention relates to an insulating coating composition that can be used for electric / electronic parts such as a motor, a transformer, and a coating method using the same.

In general, electrical components such as high voltage transformers, low voltage transformers, home appliances, stators and rotors for industrial motors, alternator motors and starter motors for automotive electronic parts are coated with an insulating coating composition to have electrical stability and stability against external impact. do.

Conventional insulating coating compositions generally include unsaturated polyester resins as binder resins and use styrene monomers as reactive diluents. However, recently, due to environmental problems, the social atmosphere that regulates the use of styrene monomer, which is problematic due to volatility and odors, is increasing, and when the thermosetting process is performed using the insulating coating composition, The odor and vapor of the styrene monomer generated worsens the working conditions of the workplace, and can generate emissions above the total hydrocarbon standard, as well as high pressure transformers, low pressure transformers, home appliances, and industrial products produced by impregnation treatment. In the electric and electronic products produced such as the stator and rotor of the motor, the alternator motor and the starter motor for automotive electronic parts, the characteristic smell of the styrene monomer is generated during the heating by the subsequent operation.

Accordingly, an object of the present invention is to reduce the total hydrocarbon value generated in the curing process, to improve the working environment by reducing the odor, and to reduce the odor generated during the subsequent heating of the coated product insulation coating composition To provide.

Still another object of the present invention is to provide a method of coating an object using an insulating coating composition which can reduce the total hydrocarbon value of the binder to be applied and reduce the odor upon heating.

Insulation coating composition according to an embodiment for achieving the above object of the present invention is a polymer having a weight average molecular weight of about 3,000 to about 50,000 unsaturated polyester resin of about 20 to 70% by weight, a diluent having an extra acrylate group And about 0.1 to 5.0 parts by weight of a curing agent based on 100 parts by weight of the binder mixture and the polymer binder mixture.

According to one embodiment, the polymer binder mixture may further include a filler, and the filler may include calcium carbonate, talc, silica, aluminum hydroxide, magnesium oxide, or a mixture thereof, It may include about 10 to 70 parts by weight based on 100 parts by weight.

According to one embodiment, the polymer binder mixture is a polymerization inhibitor, a curing accelerator or a mixture thereof as an additive About 100 parts by weight of the polymer binder mixture usage It may further comprise 0.1 to 7.0 parts by weight.

According to one embodiment, the polymer binder mixture further comprises a diluent having a benzene group, the content of the diluent having an acrylate group is about 20 to 60% by weight, the content of the diluent having a benzene group is about 1 to 20 weight May contain%.

According to one embodiment, the diluent having an acrylate group is butyl acrylate, methyl methacrylate, acrylic acid, methacrylic acid, dipropylene glycol diacrylate, hydroxy ethyl acrylate, 2-hydroxyethyl methacrylate, hydroxy Hydroxy methacrylate, hydroxypropyl acrylate, hexanediol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate or mixtures thereof, and the diluent having the benzene ring may include vinyltoluene, Chlorostyrene, 2-phenoxyethyl methacrylic acid, 2-phenoxyethyl acrylic acid, ethoxylated bisphenol A diacrylate, ethoxylated bisphenol A dimethacrylate, ethoxylated nonyl phenol acrylate or Mixtures thereof.

Coating method according to an embodiment for realizing another object of the present invention is about 20 to 70 weight of unsaturated polyester resin with a weight average molecular weight of about 3,000 to 50,000, butyl acrylate, methyl methacrylate, acrylic acid, methacrylic acid, Dipropylene glycol diacrylate, hydroxy ethyl acrylate, 2-hydroxyethyl methacrylate, hydroxy methacrylate, hydroxypropyl acrylate, hexanediol diacrylate, tripropylene glycol diacrylate, trimethylolpropane A polymer binder mixture comprising a diluent having an extra acrylate group including triacrylate alone or in combination, and an insulating coating composition comprising about 0.1 to 5.0 parts by weight of a curing agent based on 100 parts by weight of the polymer binder mixture are contained in the object. Coating, To cure the insulating coating composition coated on the group object.

According to one embodiment, the object may be preheated, cooled, impregnated in the insulating coating composition, and the object impregnated in the insulating coating composition may be filtrated for a predetermined time.

According to one embodiment, the insulating coating composition may be heated to cure the insulating coating composition.

Insulating coating composition according to an embodiment for achieving another object of the present invention is about 20 to 70% by weight of an unsaturated polyester resin having a weight average molecular weight of about 3,000 to 50,000, about 20 to 60% by weight of a diluent having an acrylate group, About 0.1 to 5.0 parts by weight of the curing agent, about 10 to 70 parts by weight of the filler, the polymerization inhibitor and the curing accelerator, respectively, based on the polymer binder mixture including about 1 to 20% by weight of the diluent having a benzene ring and 100 parts by weight of the polymer binder mixture. An insulating coating composition having a weight average molecular weight of about 3,000 to 50,000 containing 0.1 to 7.0 parts by weight of an additive included alone or in combination is coated on the object, and the insulating coating composition coated on the object is cured by heating.

According to the insulation coating composition of the present invention described above, it is possible to improve the odor problem in the working environment and process occurs when applying the existing insulation coating composition. In addition, the total hydrocarbon (THC) value generated during the curing process during coating on the object is significantly reduced to 10% or less compared to the total hydrocarbon value generated during the curing process during coating using the insulating coating composition using a conventional styrene monomer as a diluent. Can improve working environment and air pollution. In addition, in the produced electrical and electronic products such as high voltage transformers, low voltage transformers, electrical appliances, stators and rotors of industrial motors, alternator motors and starter motors for automotive electronic parts coated with the insulating coating composition of the present invention, odor problems generated during assembly and heating Can be improved.

Hereinafter, an insulating coating composition and a coating method using the same according to embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments, and a person of ordinary skill in the art may implement the present invention in various other forms without departing from the technical spirit of the present invention.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. The singular forms “a,” “an” and “the” include plural expressions unless the context clearly indicates otherwise. It is to be understood that the combination is intended to be present, but not to exclude in advance the possibility of the presence or addition of one or more other features or numbers, steps, operations, components, parts or combinations thereof. Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Insulation coating composition

The insulating coating composition of the present invention comprises a polymer binder mixture and a curing agent. Specifically, the insulating coating composition comprises an unsaturated polyester resin, a polymer binder mixture comprising a diluent having an acrylate group, and a curing agent.

As an example, the insulating coating composition may include about 20 to 70% by weight of an unsaturated polyester resin, a polymer binder mixture including an extra acrylate group, and about 0.1 to 5.0 parts by weight of a curing agent based on 100 parts by weight of the amount of the polymer binder. It may have a composition.

The unsaturated polyester resin of the present invention has a weight average molecular weight of about 3,000 to 50,000. The unsaturated polyester resin applied to the polymer binder mixture may be obtained by polymerization of a polyhydric alcohol and a polybasic acid.

For example, in order to obtain the unsaturated polyester resin, first, about 1 to 1.5 moles of polyhydric alcohol and about 1 mole of polybasic acid are added to a reactor and gradually heated with stirring to increase the temperature to about 160 to 180 ° C. for about 1 to 3 hours. Keep it. At this time, dehydration proceeds as a condensation reaction of the polybasic acid and the polyhydric alcohol occurs. The reaction temperature is then increased to about 190-240 ° C. over about 2-3 hours and then maintained. After that, the acid value and viscosity were measured, and when the desired value was reached, the reaction was stopped by cooling. As a result, the unsaturated polyester resin can be obtained.

Examples of the polyhydric alcohol include ethylene glycol, ethylene glycol, dietylene glycol, propylene glycol, dipropylene glycol, triethylolpropane, and neopentyl glycol. , 1,6-hexanediol (1,6-hexanediol), pentaerythritol, tris-hydroxyethyl isocyanurate, ethylene oxide addition bisphenol-A (bisphenol-A), and the like, each of which may be used alone or in combination.

Examples of the polybasic acid include phthalic anhydride, tetrahydro phthalic anhydride, isophthalic acid, terephthalic acid, sebacic acid, adipic acid, and azelaic acid. (azelaic acid), trimellilic anhydride, fumaric acid, maleic anhydride, soya fatty acid, linseed fatty acid, and the like, each of which may be used alone or in combination. .

Unsaturated polybasic acids such as fumaric acid, maleic anhydride, soya fatty acid, and rinse fatty acid are preferably used in the range of about 60 to 95 mol% with respect to 100 mol of the polybasic acid. In addition, in order to reduce the drying time in the coating process, it is preferable that the polybasic acid include soya fatty acid, lean seed fatty acid, etc., which include a relatively large number of unsaturated groups.

When the content of the unsaturated polyester applied to the polymer binder mixture is less than about 20% by weight of the polymer binder mixture, the thickness of the dry coating film is lowered, and the physical properties are worsened. When the content of the unsaturated polyester is greater than about 70% by weight, the viscosity is high and the workability is poor. Thus, the polymeric binder mixture comprises about 20 to 70% by weight of unsaturated polyester resin, preferably about 40 to 65% by weight.

Examples of the diluent having an acrylate group include butyl acrylate, methyl methacrylate, acrylic acid, methacrylic acid, dipropylene glycol diacrylate, Hydroxy ethyl acrylate, 2-hydroxyethyl methacrylate, hydroxy methacrylate, hydroxypropyl acrylate, hexanediol diacryl Hexanediol diacylate, tripropylene glycol diacrylate and trimethylolpropane trimethacrylate, and the like, which may be used alone or in combination.

The curing agent included in the insulating coating composition may include an organic peroxide. Examples of the organic peroxide include benzoyl peroxide, methyl ethyl ketone peroxide, acetyl peroxide, di-tert-butyl peroxide, t-butyl peroxybenzoate, t-butyl peroxytrimethyl cyclohexane, lauroyl peroxide These etc. can be mentioned, These can be used individually or in mixture, respectively. The amount of the curing agent may be about 0.1 to 5.0 parts by weight based on 100 parts by weight of the polymer binder mixture.

When the curing agent included in the insulating coating composition is less than about 0.1 part by weight with respect to 100 parts by weight of the polymer binder mixture, the drying property deteriorates, and when it exceeds about 5.0 parts by weight, the storage property of the insulating coating composition is deteriorated. Accordingly, the curing agent includes about 0.1 to 5.0 parts by weight, and preferably about 0.5 to 2 parts by weight based on 100 parts by weight of the polymer binder mixture.

As another example, the polymer binder mixture may further include a predetermined filler. Examples of the filler include calcium carbonate, talc, silica, aluminum hydroxide, magnesium oxide, and the like, which may be used alone or in combination. The content of the filler may include about 10 to 70 parts by weight based on 100 parts by weight of the polymer binder mixture. If less than about 10 parts by weight based on 100 parts by weight of the polymer binder mixture, the inherent properties of the filler are less likely to appear in the paint, and when it exceeds about 70 parts by weight, the dried coating film may be hard and cracks may occur. Thus, the insulating coating composition comprises about 10 to 70 parts by weight, and preferably about 30 to 65 parts by weight based on 100 parts by weight of the polymer binder mixture.

As one example, the polymer binder mixture may further include additives such as a curing accelerator and a polymerization inhibitor. The curing accelerator may reduce the working time by increasing the curing rate in the curing process to be described later.

Examples of the curing accelerator may include metal salts such as cobalt, manganese, copper, and lead, and an appropriate content may vary depending on gelation time. After the polymerization inhibitor is prepared for the unsaturated polyester resin, the polymerization proceeds during storage can prevent the undesirable increase in molecular weight.

Examples of the polymerization inhibitor include hydroquinone, methylhydroquinone, p-tert-butylcatechol, benzoquinone, m-dinitrobenzene, and the like. And these may be used alone or in combination, respectively.

As an example, the additive may include about 0.1 to 7.0 parts by weight based on 100 parts by weight of the polymer binder mixture.

The polymer binder mixture may further include a diluent having a benzene group. Including a diluent having a benzene group may increase the curing rate, but when included in excess of 20% by weight or more may increase the total hydrocarbon value generated in the curing process. Therefore, the diluent having a benzene group in the polymer binder mixture may include about 1 to 20% by weight, preferably about 1 to 10% by weight.

As another example, the polymer binder mixture is about 20 to 70% by weight of unsaturated polyester resin, the content of the diluent having an acrylate group is about 20 to 60% by weight, and the content of the diluent having the benzene group is about 1 to 20 weight It may have a composition of%.

Examples of the diluent having a benzene ring include vinyltoluene, chlorostyrene, 2-phenoxyethyl methacrylate, 2-phenoxyethyl acrylate, Ethoxylated bisphenol A diacrylate, ethoxylated bisphenol A dimethacrylate, and ethoxylated nonyl phenol acrylate. These may each be used alone or in combination.

As an example, the polymer binder mixture including the diluent having the benzene group may further include about 10 to 70 parts by weight of the filler based on 100 parts by weight of the polymer binder mixture. Examples of the filler include calcium carbonate, talc, silica, aluminum hydroxide, magnesium oxide, and the like, which may be used alone or in combination.

As an example, the polymer binder mixture including the diluent having the benzene group may further include additives such as a curing accelerator and a polymerization inhibitor. These may each be used alone or in combination. The additive may include about 0.1 to 7.0 parts by weight based on 100 parts by weight of the polymer binder mixture.

Coating method

Hereinafter, a coating method using the above-described insulating coating composition will be described.

For the coating method, first, the insulation coating composition is prepared.

According to the coating method using the insulating coating composition according to an embodiment of the present invention, a polymer binder mixture comprising about 20 to 70% by weight of an unsaturated polyester resin having a weight average molecular weight of about 3,000 to 50,000 and an extra acrylate group And about 0.1 to 5.0 parts by weight of a curing agent based on 100 parts by weight of the polymer binder mixture is coated.

As an example, examples of the diluent including an acrylate group applied to the polymer binder mixture include butyl acrylate, methyl methacrylate, acrylic acid, methacrylic acid, dipropylene glycol diacrylate, hydroxy ethyl acrylate, 2-hydroxy Ethyl methacrylate, hydroxy methacrylate, hydroxypropyl acrylate, hexanediol diacrylate, tripropylene glycol diacrylate and trimethylolpropane triacrylate, and the like, each of which may be used alone or in combination. Can be.

The curing agent applied to the polymer binder mixture may include an organic peroxide. Examples of the organic peroxide include benzoyl peroxide, methyl ethyl ketone peroxide, acetyl peroxide, di-tert-butyl peroxide, t-butyl peroxybenzoate, t-butyl peroxytrimethyl cyclohexane, lauroyl peroxide These etc. can be mentioned, These can be used individually or in mixture, respectively.

As an example, the polymer binder mixture may further include an additive including a predetermined filler and a curing accelerator, a polymerization inhibitor, and the like. Examples of the filler include calcium carbonate, talc, silica, and the like, and examples of the curing accelerator include metal salts such as cobalt, manganese, copper, and lead. Examples of the polymerization inhibitor include the filler and the curing accelerator, Additives, such as polymerization inhibitors, include hydroquinone, methylhydroquinone, p-tert-butylcatechol, benzoquinone, m-dinitrobenzene, and the like, and these may be used alone or in combination.

For example, 10 to 60 parts by weight of the filler, and 0.1 to 7.0 parts by weight of the additive may be included based on 100 parts by weight of the polymer binder mixture.

Examples of the object include high voltage transformers, low pressure transformers, electrical appliances such as stators and rotors for home appliances, industrial motors, alternator motors and starter motors for automotive electronic parts, and the like. The coating method may be continuously performed using a conveyor belt or the like.

Specifically, when coating the object, the object may be preheated before coating the insulating coating composition on the object. For example, the preheating may be performed at about 50 to 100 ° C., and the preheating time may be about 10 to 60 minutes.

Next, the preheated object may be cooled. This cooling is for cooling the surface of the object, for example, it may be made by using air, it is preferable that the surface temperature of the object is cooled to about 40 to 50 ℃.

Next, the cooled object is coated by impregnating the insulating coating composition. For example, the impregnation time is about 1 to 30 minutes and the dropping time is about 10 seconds to 10 minutes.

The insulating coating composition coated on the object may be filtered for a predetermined time before curing. Since the insulating coating composition is a fluid, it may flow on the surface of the object for a predetermined time by gravity or the like even after the impregnation and dripping steps. Therefore, it is preferable to stabilize the coating layer made of the insulating coating composition by going through the filter step for a predetermined time. For example, the filter may be performed at room temperature for about 5 to 30 minutes.

Next, the insulating coating composition coated on the object through the curing process is cured.

As an example, the curing process may be a thermosetting process. For example, the heat curing may be performed at about 100 to 170 ° C. for about 15 to 120 minutes, and heat may be applied to the insulating coating composition using a hot air drying furnace or the like.

According to a coating method using an insulating coating composition according to another embodiment of the present invention, about 20 to 70% by weight of an unsaturated polyester resin having a weight average molecular weight of about 3,000 to 50,000 and about 20 to 60% by weight of a diluent having an acrylate group About 0.1 to 5.0 parts by weight of a curing agent, about 10 to 70 parts by weight of a filler, a polymerization inhibitor and a curing accelerator based on a polymer binder mixture including about 1 to 20% by weight of a diluent having a benzene ring and 100 parts by weight of the polymer binder mixture. Each is coated with an insulating coating composition comprising about 0.1 to 7.0 parts by weight of additives, alone or in combination.

Examples of the diluent having the benzene ring include vinyltoluene, chlorostyrene, 2-phenoxyethyl methacrylic acid, 2-phenoxyethyl acrylic acid, ethoxylated bisphenol A diacrylate, and ethoxylated bisphenol A dimethacrylate. And ethoxylated nonyl phenol acrylate, and the like, which may be used alone or in combination, respectively.

The additives including the unsaturated polyester resin, the curing agent, the filler and the curing accelerator, the polymerization inhibitor, and the like are substantially the same as the unsaturated polyester resin, the curing agent, the filler and the curing accelerator, the polymerization inhibitor, and the like of the above-described insulation coating composition. It will be omitted.

When coating the object, the object may be preheated before coating the insulation coating composition to the object. Next, the preheated object may be cooled. Next, the cooled object is coated by impregnating the insulating coating composition. The insulating coating composition coated on the object may be filtered for a predetermined time before curing. Next, the insulating coating composition coated on the object through a curing process is heated and cured.

Hereinafter, the insulating coating composition and the coating method using the same according to the present invention will be described through specific examples and comparative examples.

Example 1

The flask was equipped with a thermometer, condenser, stirrer and condenser and a temperature raising device was attached. About 530 g of fatty acid, about 580 g of propylene glycol, about 300 g of phthalic acid, about 1,030 g of ethylene glycol, about 2,050 g of maleic anhydride, and about 1.3 g of hydroquinone are added to the solution, and the temperature is increased to about 180 ° C. while gradually stirring. It was kept at this temperature for about 1 hour. Then, the temperature was raised to about 240 ° C. over about 2 hours and then maintained at this temperature. The acid value was measured while watching the reaction, and the acid value was terminated at about 20 or less, and the temperature of the solution was cooled to about 100 ° C. or lower. Then, about 2,000 g of butyl acrylate, which is a diluent containing acrylate, and hexanediol di The solution was diluted with about 1,000 g of acrylate and about 300 g of 2-phenoxyethyl methacrylic acid, a diluent comprising benzene. Next, about 5 g of cobalt naphthenate was added as a curing accelerator to obtain a polymer binder mixture having a final viscosity of A-I (Gardner viscosity). About 1% by weight of benzoyl peroxide as a curing agent was added to the entire polymer binder mixture to obtain an insulating coating composition.

Example 2

The flask was equipped with a thermometer, a condenser, a stirrer, and a condenser, and a temperature raising device was attached. About 530 g of fatty acid, about 580 g of propylene glycol, about 300 g of phthalic acid, about 1,030 g of ethylene glycol, about 2,050 g of maleic anhydride, and about 1.3 g of hydroquinone are added to the solution, and the temperature is increased to about 180 ° C. while gradually stirring. It was kept at this temperature for about 1 hour. Then, the temperature was raised to about 240 ° C. over about 2 hours and then maintained at this temperature. The acid value was measured while watching the reaction, and the acid value was terminated at about 20 or less, the temperature of the solution was cooled to about 100 or less, and then about 2500 g of butyl acrylate, a diluent containing acrylate, and hexanediol diacrylate. The solution was diluted to about 1500 g. Next, about 5 g of about 10% cobalt naphthenate was added as a curing accelerator to obtain a polymer binder mixture having a final viscosity A-I (Gardner viscosity). About 1% by weight of benzoyl peroxide as a curing agent was added to the entire polymer binder mixture to obtain an insulating coating composition.

Example 3

The flask was equipped with a thermometer, a condenser, a stirrer, and a condenser, and a temperature raising device was attached. About 530 g of fatty acid, about 580 g of propylene glycol, about 300 g of phthalic acid, about 1030 g of ethylene glycol, about 2050 g of maleic anhydride, and about 1.3 g of hydroquinone were added to the solution, and the temperature was increased to about 180 ° C. while gradually stirring. Was maintained for about 1 hour. Then, the temperature was raised to about 240 ° C. over about 2 hours and then maintained at this temperature. The acid value was measured while watching the reaction, and the acid value was terminated at about 20 or less, and the temperature of the solution was cooled to about 100 ° C. or lower. Then, about 2000 g of butyl acrylate, which is a diluent containing acrylate, and hexanediol diacryl The solution was diluted with about 1000 g of rate and about 300 g of 2-phenoxyethyl methacrylic acid, a diluent comprising benzene. Next, about 5 g of about 10% cobalt naphthenate was added as a curing accelerator to obtain a polymer binder mixture having a final viscosity A-I (Gardner viscosity). To about 50 g of the polymer binder mixture, about 30 g of silica, about 15 g of tripropylene glycol diacrylate, and about 5 g of about 10% cobalt naphthenate were added to obtain a polymer binder mixture. About 1 g of benzoyl peroxide was added to the polymer binder mixture as a curing agent to obtain an insulation coating composition.

Example 4

The flask was equipped with a thermometer, a condenser, a stirrer, and a condenser, and a temperature raising device was attached. About 530 g of fatty acid, about 580 g of propylene glycol, about 300 g of phthalic acid, about 1030 g of ethylene glycol, about 2050 g of maleic anhydride, and about 1.3 g of hydroquinone were added to the solution, and the temperature was increased to about 180 ° C. while gradually stirring. Was maintained for about 1 hour. Then, the temperature was raised to about 240 ° C. over about 2 hours and then maintained at this temperature. The acid value was measured while watching the reaction, and the acid value was terminated at about 20 or less, the temperature of the solution was cooled to about 100 or less, and then about 2500 g of butyl acrylate, a diluent containing acrylate, and hexanediol diacrylate. The solution was diluted to about 1500 g. Next, about 5 g of about 10% cobalt naphthenate was added as a curing accelerator to obtain a polymer binder mixture having a final viscosity A-I (Gardner viscosity). About 1% by weight of benzoyl peroxide as a curing agent was added to the entire polymer binder mixture to obtain an insulating coating composition. To about 50 g of the polymer binder mixture, about 30 g of silica, about 15 g of tripropylene glycol diacrylate, and about 5 g of about 10% cobalt naphthenate were added to obtain a polymer binder mixture. About 1 g of benzoyl peroxide was added to the polymer binder mixture as a curing agent to obtain an insulation coating composition.

Comparative Example 1

The flask was equipped with a thermometer, a condenser, a stirrer, and a condenser, and a temperature raising device was attached. About 530 g of fatty acid, about 580 g of propylene glycol, about 300 g of phthalic acid, about 1030 g of ethylene glycol, about 2050 g of maleic anhydride, and about 1.3 g of hydroquinone were added to the solution, and the temperature was increased to about 180 ° C. while gradually stirring. Was maintained for about 1 hour. Then, the temperature was raised to about 240 ° C. over about 2 hours and then maintained at this temperature. The acid value was measured while watching the reaction, the reaction was terminated at an acid value of about 20 or less, the temperature of the solution was cooled to about 100 ° C. or less, and the solution was diluted with about 3300 g of styrene monomer. Next, about 5 g of about 10% cobalt naphthenate was added as a curing accelerator to obtain a polymer binder mixture having a final viscosity A-I (Gardner viscosity). About 1% by weight of benzoyl peroxide as a curing agent was added to the entire polymer binder mixture to obtain an insulating coating composition.

Comparative Example 2

The flask was equipped with a thermometer, a condenser, a stirrer, and a condenser, and a temperature raising device was attached. About 530 g of fatty acid, about 580 g of propylene glycol, about 300 g of phthalic acid, about 1030 g of ethylene glycol, about 2050 g of maleic anhydride, and about 1.3 g of hydroquinone were added to the solution, and the temperature was increased to about 180 ° C. while gradually stirring. Was maintained for about 1 hour. Then, the temperature was raised to about 240 ° C. over about 2 hours and then maintained at this temperature. The acid value was measured while watching the reaction, the reaction was terminated at an acid value of about 20 or less, the temperature of the solution was cooled to about 100 or less, and the solution was diluted with about 4000 g of styrene monomer. Next, about 5 g of about 10% cobalt naphthenate was added as a curing accelerator to obtain a polymer binder mixture having a final viscosity A-I (Gardner viscosity). About 1% by weight of benzoyl peroxide as a curing agent was added to the entire polymer binder mixture to obtain an insulating coating composition.

Comparative Example 3

The flask was equipped with a thermometer, a condenser, a stirrer, and a condenser, and a temperature raising device was attached. About 530 g of fatty acid, about 580 g of propylene glycol, about 300 g of phthalic acid, about 1030 g of ethylene glycol, about 2050 g of maleic anhydride, and about 1.3 g of hydroquinone were added to the solution, and the temperature was increased to about 180 ° C. while gradually stirring. Was maintained for about 1 hour. Then, the temperature was raised to about 240 ° C. over about 2 hours and then maintained at this temperature. The acid value was measured while watching the reaction, the reaction was terminated at an acid value of about 20 or less, the temperature of the solution was cooled to about 100 ° C. or less, and the solution was diluted with about 3300 g of styrene monomer. Next, about 5 g of about 10% cobalt naphthenate was added as a curing accelerator to obtain a polymer binder mixture having a final viscosity A-I (Gardner viscosity). To about 50 g of the polymer binder mixture, about 30 g of silica, about 15 g of styrene mononer, and about 5 g of about 10% cobalt naphthenate were added to obtain a polymer binder mixture. About 1 g of benzoyl peroxide was added to the polymer binder mixture as a curing agent to obtain an insulation coating composition.

Comparative Example 4

The flask was equipped with a thermometer, a condenser, a stirrer, and a condenser, and a temperature raising device was attached. About 530 g of fatty acid, about 580 g of propylene glycol, about 300 g of phthalic acid, about 1,030 g of ethylene glycol, about 2,050 g of maleic anhydride, and about 1.3 g of hydroquinone are added to the solution, and the temperature is increased to about 180 ° C. while gradually stirring. It was kept at this temperature for about 1 hour. Then, the temperature was raised to about 240 ° C. over about 2 hours and then maintained at this temperature. The acid value was measured while watching the reaction, the reaction was terminated at an acid value of about 20 or less, the temperature of the solution was cooled to about 100 ° C. or less, and the solution was diluted with about 4000 g of styrene monomer. Next, about 5 g of about 10% cobalt naphthenate was added as a curing accelerator to obtain a polymer binder mixture having a final viscosity A-I (Gardner viscosity). To about 50 g of the polymer binder mixture, about 30 g of silica, about 15 g of styrene mononer, and about 5 g of about 10% cobalt naphthenate were added to obtain a polymer binder mixture. About 1 g of benzoyl peroxide was added to the polymer binder mixture as a curing agent to obtain an insulation coating composition.

A plurality of high pressure transformers were prepared, preheated and air cooled, and impregnated into the insulating coating compositions of Examples 1 to 4 and Comparative Examples 1 to 4, respectively, followed by a filter and a curing process. The high pressure transformers impregnated in the insulation coating compositions of each of Examples 1 to 4 and Comparative Examples 1 to 4 were dried in a hot air drying furnace at about 170 ° C. for about 1 hour. The physical properties of the coating layer obtained from the insulating coating compositions of Examples 4 and Comparative Examples 1 to 4 were measured and shown in Table 1 below.

Table 1.

The viscosity was measured according to the test method of BROOKFIELD (LVT) at about 25 ℃, the dielectric breakdown strength was measured according to the test method of KSC-2312, the volume resistivity is It was measured according to the test method of KSC-2312, and the gelling time was measured according to the test method of KSC-2312 at about 120 ° C.

The smell of the insulation coating composition is determined to be good if the smell is not felt at all at about 5 cm from the nose by putting the coating composition in a 1 L container.

After curing the coating composition, the smell is put into a 4L container, the high-pressure transformer or motor cured with the coating composition, and after sealing it is heated at about 90 ℃ for about 60 minutes to open the airtight lid, if you do not feel any smell at about 5cm position is good, if you feel the smell It is judged to be defective.

The total hydrocarbon (THC) measurement was carried out by applying the respective coating compositions in the drying equipment line using the actual coating composition and then operating the work line under the same conditions, and exhausting the total hydrocarbon (THC) measurement equipment. The actual total hydrocarbon (THC) measurement as measured in the doc is indicated.

The total hydrocarbon measurement value is the result of a simple laboratory experiment and was measured to be about 10% or less of the comparative example measurement value when the actual impregnation line was applied to satisfy the environmental regulation measurement value.

The weight loss (%) measurement experiment was performed by curing the coating composition in a container having a diameter of about 9 cm at about 120 ° C. for about 60 minutes and measuring the weight of the insulating coating composition after curing with respect to the weight of the initial liquid coating composition to determine a weight loss experimental value. do.

* Weight loss (%) = [1- {(C)-(A)} / {(B)-(A)}] × 100

(A: container weight, B: insulating coating composition + weight of container after adding liquid coating composition, C: insulating coating composition + weight of container after curing)

Referring to Table 1, it can be seen that the coating layer formed from the insulating coating composition of Examples 1 to 4 has similar physical properties compared to the coating layer formed from the insulating coating composition of Comparative Examples 1 to 4. In addition, the total hydrocarbon concentration and the weight loss value were significantly lower in the insulating coating composition and the object coated with the insulating coating composition, and the problem of the smell of the insulating coating composition in the liquid state of the insulating coating composition and the cured product was also significantly improved. Appeared to be.

The insulating coating composition of the present invention described above has properties similar to those of the insulating coating composition containing a conventional styrene monomer. The insulation coating composition may significantly improve the total hydrocarbon concentration and the weight loss generated when the insulation coating composition is manufactured. In addition, in the produced electrical and electronic products such as high voltage transformers, low pressure transformers, home appliances, industrial motor stators and rotors, alternator motors and starter motors for automotive electronic parts coated with the insulating coating composition, the odor problems generated during assembly and improvement are improved. can do. Therefore, the cured product coated with the insulating coating composition may significantly improve the coating composition odor problem.

As described above with reference to the embodiments of the present invention, those skilled in the art may variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. I can understand that you can.

Claims

A polymer binder mixture comprising 20 to 70% by weight of an unsaturated polyester resin having a weight average molecular weight of 3,000 to 50,000 and a diluent having an extra acrylate group; And

An insulating coating composition comprising 0.1 to 5.0 parts by weight of a curing agent based on 100 parts by weight of the polymer binder mixture.

The method of claim 1, further comprising 10 to 70 parts by weight of the filler with respect to 100 parts by weight of the polymer binder mixture, wherein the filler comprises at least one selected from the group consisting of calcium carbonate, talc, silica, aluminum hydroxide and magnesium oxide. Insulation coating composition, characterized in that.

According to claim 1, wherein the diluent having an acrylate group is butyl acrylate (butyl acrylate), methyl methacrylate (methyl methacrylate), acrylic acid (acrylic acid), methacrylic acid (methacrylic acid), dipropylene glycol diacrylate ( dipropylene glycol diacrylate, hydroxy ethyl acrylate, 2-hydroxyethyl methacrylate, hydroxy methacrylate, hydroxypropyl acrylate Insulation coating, characterized in that it comprises at least one selected from the group consisting of hexanediol diaacrylate (hexanediol diacylate), tripropylene glycol diacrylate (tripropylene glycol diacylate) and trimethylolpropane trimethacrylate (trimethylolpropane trimethacrylate) Composition

The insulating coating composition of claim 2, further comprising 0.1 to 7.0 parts by weight of an additive including an polymerization inhibitor, a curing accelerator, or a mixture thereof, based on 100 parts by weight of the polymer binder mixture.

The method of claim 1, wherein the polymer binder mixture further comprises a diluent having a benzene group, the content of the diluent having an acrylate group is 20 to 60% by weight, the content of the diluent having a benzene group is 1 to 20% by weight Insulation coating composition, characterized in that.

The diluent having an acrylate group according to claim 5, wherein the diluent having an acrylate group is butyl acrylate, methyl methacrylate, acrylic acid, methacrylic acid, dipropylene glycol diacrylate, hydroxy ethyl acrylate, 2-hydroxyethyl methacrylate, hydroxy. At least one selected from the group consisting of hydroxy methacrylate, hydroxypropyl acrylate, hexanediol diacrylate, tripropylene glycol diacrylate and trimethylolpropane triacrylate,

The diluent having a benzene ring is vinyltoluene, chlorostyrene, 2-phenoxyethyl methacrylate, 2-phenoxyethyl acrylate, ethoxylay At least one selected from the group consisting of ethoxylated bisphenol A diacrylate, ethoxylated bisphenol A dimethacrylate and ethoxylated nonyl phenol acrylate Insulation coating composition comprising one.

The method of claim 5, further comprising 10 to 70 parts by weight of the filler based on 100 parts by weight of the polymer binder mixture, wherein the filler comprises at least one selected from the group consisting of calcium carbonate, talc, silica, aluminum hydroxide and magnesium oxide. Insulation coating composition, characterized in that.

The insulating coating composition according to claim 7, further comprising 0.1 to 7.0 parts by weight of an additive including an polymerization inhibitor, a curing accelerator, or a mixture thereof, based on 100 parts by weight of the polymer binder mixture.

20 to 70% by weight of unsaturated polyester resins having a weight average molecular weight of 3,000 to 50,000 and butyl acrylate, methyl methacrylate, acrylic acid, methacrylic acid, dipropylene glycol diacrylate, hydroxy ethyl acrylate, 2-hydroxyethyl Extra acrylate groups including at least one selected from the group consisting of methacrylate, hydroxy methacrylate, hydroxypropyl acrylate, hexanediol diacrylate, tripropylene glycol diacrylate and trimethylolpropane triacrylate Coating an insulating coating composition comprising 0.1 to 5.0 parts by weight of a curing agent with respect to 100 parts by weight of the polymer binder mixture including a diluent having a weight of the polymer binder mixture; And

Coating method comprising curing the insulating coating composition coated on the object.

The method of claim 9, wherein the coating on the object comprises:

Preheating the object;

Cooling the object;

Impregnating the object into the insulating coating composition; And

Coating the object impregnated in the insulating coating composition for a predetermined time.

The method of claim 9, wherein curing the insulating coating composition comprises:

Coating the insulating coating composition.

Weight average molecular weight 3,000 to 50,000 Polymer binder mixture comprising 20 to 70% by weight unsaturated polyester resin, 20 to 60% by weight diluent having an acrylate group, 1 to 20% by weight diluent having a benzene ring and 100% by weight of the polymer binder mixture Coating an object with an insulating coating composition comprising from 0.1 to 5.0 parts by weight of a curing agent, from 10 to 70 parts by weight of a filler, from 0.1 to 7.0 parts by weight of an additive including a polymerization inhibitor, a curing accelerator or a mixture thereof; And

Coating method comprising the step of curing by heating the insulating coating composition coated on the object.