KR20220014554A - Heat-resistant coating composition improved crack resistance and method for manufacturing coated body using the same - Google Patents

Abstract

Disclosed are a heat-resistant paint composition with improved crack resistance and a method for manufacturing a coating body using the same. The heat-resistant paint composition with improved crack resistance includes 30 to 40 parts by weight of a polysiloxane resin; 10 to 20 parts by weight of a pigment; and 45 to 50 parts by weight of a solvent.

Description

Heat-resisting paint composition with improved crack resistance and method for manufacturing a coating body using the same

The present disclosure relates to a heat-resistant paint composition having improved crack resistance and a method for manufacturing a coating body using the same.

Recently, the need for resins having various physical properties such as high hardness and high heat resistance compared to conventional organic resins has been highlighted. In this regard, Korean Patent No. 10-0432211 discloses a technology for a coating composition for coating the surface of an article requiring heat resistance (eg, an electric device, an automobile lamp, etc.).

Conventionally, polymer composite paints prepared by adding inorganic fillers to organic binders have been manufactured, but recently, organic/inorganic hybrid paints with excellent stability, heat resistance and compatibility with paints have been developed. In the preparation of the organic-inorganic hybrid paint, polysiloxane is used as a binder, and the polysiloxane serves to improve adhesion between other components in the paint, paint performance, and heat resistance. However, since conventional pure polysiloxane has poor shrink resistance and crack resistance at high temperatures, cracks occur in the coating film when the painted surface is cured at a high temperature of 200° C. or higher, and the original binder function is not properly performed. existed Therefore, there is a need to develop a new heat-resistant paint composition that improves the problems of the prior art.

The technical idea of the present disclosure is to solve the above problems, and it is an object of the present disclosure to provide a technique for manufacturing a coating composition having excellent heat resistance and improved shrinkage resistance and crack resistance.

The problems to be solved by the present invention are not limited to the above problems, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description.

In order to achieve this object, as an embodiment of the present invention, a heat-resistant paint composition with improved crack resistance includes 30 to 40 parts by weight of a polysiloxane resin; 10-20 parts by weight of pigment; and 45 to 50 parts by weight of a solvent.

In addition, the heat-resistant paint composition may further include 4 to 10 parts by weight of an additive.

In addition, the polysiloxane resin may be prepared by reacting different types of organic silanes.

In addition, the organosilane is methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, i-propyltrimethyl Toxysilane, i-propyltriethoxysilane, n-butyltrimethoxysilane, n-butyltriethoxysilane, n-pentyltrimethoxysilane, n-hexyltrimethoxysilane, n-heptyltrimethoxysilane , n-octyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, cyclohexyltrimethoxysilane, cyclohexyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, 3-chloro Propyltrimethoxysilane, 3-chloropropyltriethoxysilane, 3,3,3-trifluoropropyltrimethoxysilane, 3,3,3-trifluoropropyltriethoxysilane, 3-aminopropyltri Methoxysilane, 3-aminopropyltriethoxysilane, 2-hydroxyethyltrimethoxysilane, 2-hydroxyethyltriethoxysilane, 2-hydroxypropyltrimethoxysilane, 2-hydroxypropyltrie Toxysilane, 3-hydroxypropyltrimethoxysilane, 3-hydroxypropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-isocyanatepropyltrimethoxy Silane, 3-isocyanatepropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane, 3-(meth)acryloxypropyltrimethoxysilane, 3-(meth)acryloxypropyltriethoxysilane, 3-ureidopropyltrimethyl Toxysilane, 3-ureidopropyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, diethyldimethoxysilane, diethyldiethoxysilane, di-n-propyldimethoxysilane, di-n-propyldie Toxysilane, di-i-propyldimethoxysilane, di-i-propyldiethoxysilane, di-n-butyldimethoxysilane, di-n-butyldiethoxysilane, di-n-pentyldimethoxysilane, di- n-pentyldiethoxysilane, di-n-hexyldimethoxysilane, di-n-heptyldimethoxysilane, di-n-heptyldiethoxysilane, di-n-octyldimethoxysilane, di-n-octyldiethoxy silane, di-n-cyclohexyldimethoxysilane, di-n-cyclohexyldiethoxysilane, At least one selected from the group consisting of diphenyldimethoxysilane and diphenyldiethoxysilane may be provided.

The polysiloxane resin is prepared by reacting 20 to 25 parts by weight of the methyltrimethoxysilane, 15 to 25 parts by weight of the phenyltrimethoxysilane, and 30 to 65 parts by weight of an organic solvent, and the organic solvent is xylene, butyl acetate , butyl cellosolve, ethyl alcohol, isopropyl alcohol, butyl alcohol, methyl ethyl ketone, methyl isobutyl ketone and at least one selected from the group consisting of propylene glycol monomethyl ether acetate may be provided.

Meanwhile, the polysiloxane resin comprises 20 to 25 parts by weight of the methyltrimethoxysilane, 10 to 20 parts by weight of the phenyltrimethoxysilane, 5 to 10 parts by weight of the 3-(meth)acryloxypropyltrimethoxysilane, and an organic solvent. It is prepared by reacting 30 to 65 parts by weight, and the organic solvent is xylene, butyl acetate, butyl cellosolve, ethyl alcohol, isopropyl alcohol, butyl alcohol, methyl ethyl ketone, methyl isobutyl ketone, and propylene glycol monomethyl ether acetate. It may be provided with at least one selected from the group consisting of.

In order to achieve this object, as another embodiment of the present invention, a method for manufacturing a coating body using a heat-resistant coating composition includes a coating step of applying the heat-resistant coating composition to an object to be coated; and a curing step of curing the coating layer formed in the coating step.

The means for solving the above-described problems are merely exemplary, and should not be construed as limiting the present invention. In addition to the exemplary embodiments described above, there may be additional embodiments described in the drawings and detailed description.

As described above, according to various embodiments of the present invention, since the coating composition is prepared using polysiloxane resins prepared by reacting different types of organosilanes, the content of inorganic substances contained in the heat-resistant coating composition is increased to improve heat resistance and flame retardancy. It has an excellent effect.

In addition, according to various embodiments of the present invention, when preparing a polysiloxane resin, a certain amount of phenyltrimethoxysilane is added to methyltrimethoxysilane and reacted together to synthesize a polysiloxane resin, or phenyltrimethoxysilane to methyltrimethoxysilane By adding and reacting a certain amount of silane and 3-(meth)acryloxypropyltrimethoxysilane to synthesize polysiloxane resin, flame retardancy, curability, adhesion, hardness, solvent resistance, and stain resistance while maintaining high inorganic content of heat-resistant paint composition , shrinkage resistance, smoothness, etc. have the advantage of excellent coating film properties.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a flowchart illustrating a method of manufacturing a coating body according to an embodiment of the present invention.

A preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings, but already known technical parts will be omitted or compressed for the sake of brevity of description.

It should be noted that references to "one" or "an" embodiment of the invention herein are not necessarily to the same embodiment, and they mean at least one.

In the following examples, the singular expression includes the plural expression unless the context clearly dictates otherwise.

In the following embodiments, terms such as include or have means that the features or components described in the specification are present, and the possibility that one or more other features or components may be added is not excluded in advance.

In the following embodiments, when it is said that a part such as a film, region, or component is on or on another part, not only when it is directly on the other part, but also another film, region, component, etc. is interposed therebetween. Including cases where

In cases where certain embodiments may be implemented otherwise, a specific process sequence may be performed different from the described sequence. For example, two processes described in succession may be performed substantially simultaneously, or may be performed in an order opposite to the order described. That is, each step of the method described herein may be appropriately performed in any order unless otherwise stated in the specification or clearly contradicted by context.

The term "about" used in front of a numerical value throughout this specification is used in or close to the numerical value when manufacturing and material tolerances inherent in the stated meaning are presented, and to aid understanding of the present application, the term "about" Absolute figures are used to prevent unreasonable exploitation of the stated disclosure by unscrupulous infringers.

<Description of heat-resistant paint composition>

The heat-resistant paint composition according to an embodiment of the present invention may include a polysiloxane resin, a pigment, and a solvent. In one embodiment, the polysiloxane resin may be prepared by reacting different types of organic silanes. For example, a polysiloxane resin can be obtained by adding an organic solvent to different types of organic silanes and performing hydrolysis and condensation reactions using a catalyst and water under a certain temperature.

Here, the organosilane is methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, i-propyltrimethyl Toxysilane, i-propyltriethoxysilane, n-butyltrimethoxysilane, n-butyltriethoxysilane, n-pentyltrimethoxysilane, n-hexyltrimethoxysilane, n-heptyltrimethoxysilane , n-octyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, cyclohexyltrimethoxysilane, cyclohexyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, 3-chloro Propyltrimethoxysilane, 3-chloropropyltriethoxysilane, 3,3,3-trifluoropropyltrimethoxysilane, 3,3,3-trifluoropropyltriethoxysilane, 3-aminopropyltri Methoxysilane, 3-aminopropyltriethoxysilane, 2-hydroxyethyltrimethoxysilane, 2-hydroxyethyltriethoxysilane, 2-hydroxypropyltrimethoxysilane, 2-hydroxypropyltrie Toxysilane, 3-hydroxypropyltrimethoxysilane, 3-hydroxypropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-isocyanatepropyltrimethoxy Silane, 3-isocyanatepropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane, 3-(meth)acryloxypropyltrimethoxysilane, 3-(meth)acryloxypropyltriethoxysilane, 3-ureidopropyltrimethyl Toxysilane, 3-ureidopropyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, diethyldimethoxysilane, diethyldiethoxysilane, di-n-propyldimethoxysilane, di-n-propyldie Toxysilane, di-i-propyldimethoxysilane, di-i-propyldiethoxysilane, di-n-butyldimethoxysilane, di-n-butyldiethoxysilane, di-n-pentyldimethoxysilane, di- n-pentyldiethoxysilane, di-n-hexyldimethoxysilane, di-n-heptyldimethoxysilane, di-n-heptyldiethoxysilane, di-n-octyldimethoxysilane, di-n-octyldiethoxy silane, di-n-cyclohexyldimethoxysilane, di-n-cyclohexyldiethoxysilane, At least one selected from the group consisting of diphenyldimethoxysilane and diphenyldiethoxysilane may be provided.

The polysiloxane resin according to an embodiment may be prepared through hydrolysis and condensation reactions. That is, the polysiloxane resin can be obtained through hydrolysis and condensation reaction by adding an organic solvent, a catalyst, and water to various types of organosilanes under constant temperature conditions.

In one embodiment, an organic solvent and a catalyst are added to a mixture of two or more organic silanes, and the polysiloxane resin is synthesized by stirring at room temperature (for example, 25° C.) to 150° C. for about 1 hour to 24 hours. have. In addition, distillation and removal of hydrolysis by-products or condensation by-products may be performed during stirring. In addition, the reaction temperature and stirring time during the preparation of the polysiloxane resin may be appropriately changed according to the experimental conditions.

The polysiloxane resin according to an embodiment may be prepared by reacting 20-25 parts by weight of methyltrimethoxysilane and 20-25 parts by weight of phenyltrimethoxysilane. As a specific example, the content of methyltrimethoxysilane may be about 20 parts by weight, about 21 parts by weight, about 22 parts by weight, about 23 parts by weight, about 24 parts by weight, or about 25 parts by weight. In addition, the content of methyltrimethoxysilane may be in the range of at least one of the above values and less than or equal to one of the above values.

For example, the content range of methyltrimethoxysilane is about 20 parts by weight to about 22 parts by weight, about 21 parts by weight to about 23 parts by weight, about 22 parts by weight to about 24 parts by weight, about 23 parts by weight to about 25 parts by weight. It may be provided in parts by weight or in the range of about 20 parts by weight to about 25 parts by weight. Methyltrimethoxysilane according to an embodiment may maintain the physical properties and flame retardancy of the coating film at an excellent level within the above range.

If the amount of methyltrimethoxysilane is less than 20 parts by weight, the content of inorganic substances in the polysiloxane resin is reduced, and as a result, the content of inorganic substances contained in the heat-resistant paint composition is reduced, so that heat resistance and flame retardancy may be lowered, and when it exceeds 25 parts by weight, heat resistance Since the content of inorganic substances in the coating composition is too high, cracks may occur in the coating film or there is a risk that the coating film properties may be deteriorated.

In one embodiment, when synthesizing the polysiloxane resin, the content of phenyltrimethoxysilane may be applied in an amount of 15 to 25 parts by weight. As a specific example, the content of phenyltrimethoxysilane is about 15 parts by weight, about 17 parts by weight, about 19 parts by weight, about 20 parts by weight, about 21 parts by weight, about 22 parts by weight, about 23 parts by weight, about 24 parts by weight. It may be provided in parts or about 25 parts by weight. In addition, the content of phenyltrimethoxysilane may be in the range of at least one of the above values and less than or equal to one of the above values.

For example, the content range of phenyltrimethoxysilane is about 15 parts by weight to about 22 parts by weight, about 21 parts by weight to about 23 parts by weight, about 22 parts by weight to about 24 parts by weight, about 23 parts by weight to about 25 parts by weight. It may be provided in parts by weight or in the range of about 20 parts by weight to about 25 parts by weight. Phenyltrimethoxysilane according to an embodiment may prevent cracks in the coating film and maintain stability of the coating film within the above range.

If the amount of phenyltrimethoxysilane is less than 15 parts by weight, there is a fear that cracks may occur while the coating film shrinks during high temperature curing at 200° C. or higher, and if phenyltrimethoxysilane exceeds 25 parts by weight, heat resistance and flame retardancy may decrease. The content of phenyltrimethoxysilane is preferably applied within the above-mentioned range.

In the preparation of the polysiloxane resin according to an embodiment, the usable organic solvents include xylene, butyl acetate, butyl cellosolve, ethyl alcohol, isopropyl alcohol, butyl alcohol, methyl ethyl ketone, methyl isobutyl ketone, and propylene glycol mono At least one selected from the group consisting of methyl ether acetate may be applied. The organic solvent content is 30 to 65 parts by weight (eg, 30 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, 50 parts by weight, 55 parts by weight, 56 parts by weight, 57 parts by weight, 58 parts by weight, 59 parts by weight, 60 parts by weight, 61 parts by weight, 62 parts by weight, 63 parts by weight, 64 parts by weight or 65 parts by weight).

As a specific example, the content of the organic solvent added during the preparation of the polysiloxane resin may be about 30 parts by weight, about 40 parts by weight, about 50 parts by weight, about 55 parts by weight, about 60 parts by weight, or about 65 parts by weight. In addition, the content of the organic solvent may be in the range of at least one of the above numerical values and less than or equal to one of the above numerical values. For example, the content range of the organic solvent may be provided in a range of about 30 parts by weight to about 60 parts by weight or about 62 parts by weight to about 65 parts by weight.

In one embodiment, when the polysiloxane resin is synthesized using xylene as an organic solvent added during the preparation of the polysiloxane resin, the water content of the resin is reduced and the resistance value is easily adjusted, thereby facilitating electrostatic coating of the paint. And, as an organic solvent, when xylene and butyl cellosolve are mixed in a constant weight ratio (eg, 1:1, 2:1 or 3:1), the coating properties, compatibility, stability, etc. of the coating film are deteriorated. can be further improved.

On the other hand, the polysiloxane resin according to another embodiment is reacted with 20-25 parts by weight of methyltrimethoxysilane, 10-20 parts by weight of phenyltrimethoxysilane, and 5-10 parts by weight of 3-(meth)acryloxypropyltrimethoxysilane can be manufactured by

In another embodiment, when the amount of methyltrimethoxysilane is less than 20 parts by weight, the content of inorganic substances in the polysiloxane resin is reduced, and as a result, the content of inorganic substances contained in the heat-resistant coating composition decreases, so that heat resistance and flame retardancy may be reduced, and more than 25 parts by weight If the inorganic material content in the heat-resistant coating composition is too high, cracks may occur in the coating film or the physical properties of the coating film may be deteriorated.

In another embodiment, when synthesizing the polysiloxane resin, the content of phenyltrimethoxysilane may be applied in an amount of 10 to 20 parts by weight. As a specific example, the content of phenyltrimethoxysilane is about 10 parts by weight, about 11 parts by weight, about 12 parts by weight, about 13 parts by weight, about 14 parts by weight, about 15 parts by weight, about 16 parts by weight, about 17 parts by weight. parts, about 18 parts by weight, about 19 parts by weight, or about 20 parts by weight. In addition, the content of phenyltrimethoxysilane may be in the range of at least one of the above values and less than or equal to one of the above values.

For example, the content range of phenyltrimethoxysilane is about 10 parts by weight to about 13 parts by weight, about 11 parts by weight to about 14 parts by weight, about 12 parts by weight to about 15 parts by weight, about 13 parts by weight to about 15 parts by weight. parts by weight, about 14 parts by weight to about 17 parts by weight, about 15 parts by weight to about 18 parts by weight, about 16 parts by weight to about 19 parts by weight, about 17 parts by weight to about 20 parts by weight, or about 10 parts by weight to about 20 parts by weight It may be provided in the range of parts by weight. Phenyltrimethoxysilane according to another embodiment may prevent cracks in the coating film and maintain stability of the coating film within the above range. If the amount of phenyltrimethoxysilane is less than 10 parts by weight, there is a fear that cracks may occur while the coating film shrinks during high temperature curing at 200° C. or higher, and when phenyltrimethoxysilane exceeds 20 parts by weight, 3-(meth)acryloxypropyltri Since compatibility with methoxysilane may be adversely affected while compatibility with methoxysilane may be negatively affected, the content of phenyltrimethoxysilane is preferably applied within the above-described range.

When preparing a polysiloxane resin according to another embodiment, when 3-(meth)acryloxypropyltrimethoxysilane is added along with methyltrimethoxysilane and phenyltrimethoxysilane to make a polysiloxane resin, other components included in the heat-resistant paint composition Compatibility with other materials may be improved, and crosslinking density and curability may be further improved upon curing of the heat-resistant paint composition.

As a specific example, the content of 3-(meth)acryloxypropyltrimethoxysilane is about 5 parts by weight, about 6 parts by weight, about 7 parts by weight, about 8 parts by weight, about 9 parts by weight or about 10 parts by weight. can In addition, the content of 3-(meth)acryloxypropyltrimethoxysilane may be in the range of at least one of the above values and less than or equal to one of the above values.

For example, the content range of 3-(meth)acryloxypropyltrimethoxysilane is about 5 parts by weight to about 7 parts by weight, about 6 parts by weight to about 8 parts by weight, about 7 parts by weight to about 9 parts by weight; It may be provided in the range of about 8 parts by weight to about 10 parts by weight or about 5 parts by weight to about 10 parts by weight. 3-(meth)acryloxypropyltrimethoxysilane according to an embodiment can be easily cured within the above range and maintain excellent physical properties of the coating film. If 3-(meth)acryloxypropyltrimethoxysilane is less than 5 parts by weight, the effect of improving physical properties is insignificant, and when it exceeds 10 parts by weight, the coating film hardness may decrease and yellowing may occur. - When adding (meth)acryloxypropyltrimethoxysilane, it is preferably applied in an amount of 5 to 10 parts by weight. In addition, since the type and content of the organic solvent that can be used in the preparation of the polysiloxane resin according to another embodiment are the same as described above, the overlapping description will be omitted.

When preparing the polysiloxane resin according to an embodiment, as an acid or basic catalyst, at least one of acetic acid, formic acid, hydrochloric acid, nitric acid, phosphoric acid, aqueous ammonia and sodium hydroxide may be applied as a usable catalyst. For example, when synthesizing the polysiloxane resin, an 8w/w% aqueous solution of formic acid may be used as a catalyst composed of water and an acid.

In addition, in one embodiment, the content of the catalyst for hydrolysis and condensation of organic silane may be applied in an amount of 7 to 10 parts by weight (eg, 7 parts by weight, 8 parts by weight, 9 parts by weight, or 10 parts by weight). . And, the content of the catalyst may be in the range of at least one of the above values and less than or equal to one of the above values. For example, the content range of the catalyst for the hydrolysis and condensation reaction of organic silane may be provided in a range of about 7 parts by weight to about 9 parts by weight or about 8 parts by weight to about 10 parts by weight. Of course, the content range of the catalyst is not limited to the above-described range, and may be flexibly changed according to the content of the organosilane input during the synthesis of the polysiloxane resin. In addition, the concentration of the catalyst for the hydrolysis and condensation reaction of organosilane can be applied in various ranges.

The heat-resistant paint composition according to an embodiment may include a polysiloxane resin, a pigment, a solvent, an additive, and silica. In one embodiment, the polysiloxane resin may be provided in an amount of 30 to 40 parts by weight. As a specific example, the content of the polysiloxane resin is about 30 parts by weight, about 31 parts by weight, about 32 parts by weight, about 33 parts by weight, about 34 parts by weight, about 35 parts by weight, about 36 parts by weight, about 37 parts by weight, about 38 parts by weight. It may be provided in parts by weight, about 39 parts by weight, or about 40 parts by weight. In addition, the content range of the polysiloxane resin may be in the range of at least one of the above numerical values and less than or equal to one of the above numerical values.

For example, the content range of the polysiloxane resin is about 30 parts by weight to about 33 parts by weight, about 31 parts by weight to about 34 parts by weight, about 32 parts by weight to about 35 parts by weight, about 33 parts by weight to about 37 parts by weight; It may be provided in the range of about 34 parts by weight to about 38 parts by weight, about 35 parts by weight to about 39 parts by weight, about 36 parts by weight to about 40 parts by weight, or about 30 parts by weight to about 40 parts by weight. The polysiloxane resin according to an embodiment may maintain heat resistance and flame retardancy at an excellent level within the above range.

If the amount of the polysiloxane resin is less than 30 parts by weight, the content of inorganic substances in the entire heat-resistant coating composition decreases, heat resistance and flame retardancy may decrease, and the physical properties of the coating film may decrease overall, and if it exceeds 40 parts by weight, the coating film hardness is lowered or the substrate Since there is a risk of lowering adhesion with the polysiloxane resin, the content of the polysiloxane resin is preferably applied within the above-described range.

In one embodiment, the content of the pigment may be applied in an amount of 10 to 20 parts by weight. As a specific example, the content of the pigment is about 10 parts by weight, about 11 parts by weight, about 12 parts by weight, about 13 parts by weight, about 14 parts by weight, about 15 parts by weight, about 16 parts by weight, about 17 parts by weight, about 18 parts by weight. parts, about 19 parts by weight, or about 20 parts by weight. In addition, the content of the pigment may be in the range of at least one of the above values and less than or equal to one of the above values.

For example, the content range of the pigment is in the range of about 10 parts by weight to about 15 parts by weight, about 12 parts by weight to about 17 parts by weight, about 15 parts by weight to about 20 parts by weight, or about 10 parts by weight to about 20 parts by weight. can be provided. The pigment according to an embodiment may maintain the coating film properties at an excellent level within the above range. If the amount of the pigment is less than 10 parts by weight, it may be difficult to realize the color of the paint due to a decrease in hiding power. As a result, the paint workability may be deteriorated.

The heat-resistant paint composition according to an embodiment contains 45-50 parts by weight of a solvent (eg, 45 parts by weight, 46 parts by weight, 47 parts by weight, 48 parts by weight, 49 parts by weight, 50 parts by weight) for coating properties and painting workability. ) may be included. Here, the solvent may be ethyl alcohol, isopropyl alcohol, butyl alcohol, butyl cellosolve, xylene, methyl ethyl ketone, methyl isobutyl ketone, or propylene glycol monomethyl ether acetate, but is not limited to the above-described examples and is known Other types of solvents may be used as solvents. In addition, the content of the solvent may be appropriately adjusted in consideration of the content of other components added to the heat-resistant paint composition. In addition, when xylene and butyl cellosolve are mixed in a constant weight ratio (eg, 1:1, 2:1, or 3:1) as a solvent in the preparation of the coating composition, electrostatic coating of the paint is easy and the coating film of coating property, compatibility, stability, etc. can be further improved.

In addition, the heat-resistant paint composition according to an embodiment contains 4 to 10 parts by weight of an additive (eg, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, or 10 parts by weight) may further include. In one embodiment, as the additive, at least one may be selected from the group consisting of a general dispersing agent, an antifoaming agent, a leveling agent and a viscosity stabilizer, and two or more additives may be mixed in an appropriate amount to exhibit optimal coating film performance. .

<Description of the manufacturing method of the coating body using the heat-resistant paint composition>

A method for manufacturing a coating body according to an embodiment of the present invention will be described according to the flowchart shown in FIG. 1, but for convenience, the order will be attached. In the present specification, the coating means an interior or exterior material in which a heat-resistant coating composition is coated on the surface of an object to be coated and cured to form a coating layer. For example, the coating may be applied as an interior material for automobiles or interior materials for subways in which a coating layer of a heat-resistant coating composition is formed on the surface. However, the article on which the heat-resistant paint composition can be coated is not limited to the above-described example, and may be applied to other articles such as interior materials or exterior materials for construction requiring heat resistance and flame retardancy.

1. Coating step <S101>

In this step, the coating layer may be formed on the surface of the object by applying the above-described heat-resistant coating composition to the object to be coated. In this step, a coating layer can be formed on the surface of the object to be coated with a coating film thickness of 15 to 100 μm. As a specific example, the thickness of the coating film coated on the surface of the object to be coated is about 15 μm, about 16 μm, about 17 μm, about 18 μm, about 19 μm, about 20 μm, about 21 μm, about 22 μm, about 23 μm, about 24 μm, about 25 μm, about 26 μm, about 27 μm, about 28 μm, about 29 μm, about 30 μm, about 40 μm, about 50 μm, about 60 μm, about 70 μm, about 80 μm, about 90 μm or about 100 μm. In addition, the thickness of the coating film may be applied in a range of at least one of the above values and less than or equal to one of the above values. For example, the range of the coating film thickness coated on the object to be coated is about 15 μm to about 16 μm, about 16 μm to about 17 μm, about 17 μm to about 18 μm, about 18 μm to about 19 μm, about 19 μm. to about 20 μm or about 15 μm to about 100 μm may be provided. Of course, the thickness of the coating film is not limited to the above-described example, and may be changed as necessary.

The coating method performed in this step is not limited to any specific method as long as it is a method of forming a coating layer by coating a paint on the substrate, which is the object to be coated, bar coating, slit coating, dip coating, roll coating, spin coating, spray coating, needle coating A person skilled in the art can arbitrarily select and apply it from known coating methods such as a paper method, an impregnation method, and a gravure coating method.

2. Curing step <S102>

In this step, the coating layer formed in step S101 may be cured. In one embodiment, heat treatment may be performed on the coating layer. As a specific example, in this step, the coating layer may be thermally cured at a temperature of 50 to 250° C. for 10 to 60 minutes. The heat treatment temperature and time performed in this step can be adjusted within an appropriate range so that the coating layer can be sufficiently cured.

Hereinafter, the present invention will be described in more detail through specific examples and experimental examples. Since the following Examples and Experimental Examples are merely examples to help the understanding of the present invention, the scope of the present invention is not limited or limited thereto.

1. Synthesis of polysiloxane resin

Methyltrimethoxysilane, phenyltrimethoxysilane, and 3-(meth)acryloxypropyltrimethoxysilane in a 4-neck glass flask reactor equipped with a reflux condenser, nitrogen inlet, stirrer and heating device. (unit: g), 47 g of organic solvent (organic solvent is formulated by setting the weight ratio of xylene and butyl cellosolve to 2:1) and 8 g of 8w/w% formic acid aqueous solution were added and 70 under a nitrogen stream. The mixture was stirred at ℃ for 2 hours, stirred at 110℃ for 1 hour, unreacted substances, reaction by-products and moisture were removed through a Deanstock trap, and filtered through a 1㎛ bag filter to obtain a polysiloxane resin.

ingredient Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 ¹ methyltrimethoxysilane 24 22 20 25 18 27 ² Phenyltrimethoxysilane 10 13 16 20 22 8 ³ 3-(meth)acryloxypropyltrimethoxysilane 10 8 6 5 3 12
main)
1: methyltrimethoxysilane (DOW's OFS-6060)
2: Phenyltrimethoxysilane (DOW's OFS-6124)
3: 3-(meth)acryloxypropyltrimethoxysilane (CG-0174 from QUFU)

2. Preparation of heat-resistant paint composition using polysiloxane resin of Example 1

Mix in the same composition as in Table 2 below, but mix each polysiloxane resin, pigment, solvent and additives (dispersant, antifoaming agent) at the content (unit: g) shown in Table 2 below in a 1L container, and stir for 1 hour. Then, a heat-resistant paint composition was completed.

ingredient production example
One production example
2 production example
3 Comparative Preparation Example 1 Comparative Preparation Example 2 ¹ polysiloxane resin 30 35 40 25 45 ² pigment 20 15 10 25 5 ³ solvent 46 46 46 46 46 ⁴ dispersant 2 2 2 2 2 ⁵ Antifoam 2 2 2 2 2
main)
1: Polysiloxane resin (Example 1)
2: Pigment (Tiona RCl 575 from Cristal)
3: Solvent (Xylene from GS Caltex and Butyl cellosolve from Yeocheon NCC are mixed in a weight ratio of 2:1)
4: Dispersant (Disperbyk 182 by BYK)
5: Defoamer (BYK-054 by BYK)

3. Preparation of heat-resistant paint composition using polysiloxane resin of Example 2

Mix in the same composition as in Table 3 below, but mix each polysiloxane resin, pigment, solvent and additives (dispersant, antifoaming agent) at the content (unit: g) shown in Table 3 below in a 1L container, and stir for 1 hour Then, a heat-resistant paint composition was completed.

ingredient production example
4 production example
5 production example
6 Comparative Preparation Example 3 Comparative Preparation Example 4 ¹ polysiloxane resin 30 35 40 25 45 ² pigment 20 15 10 25 5 ³ solvent 46 46 46 46 46 ⁴ dispersant 2 2 2 2 2 ⁵ Antifoam 2 2 2 2 2
main)
1: Polysiloxane resin (Example 2)
2: Pigment (Tiona RCl 575 from Cristal)
3: Solvent (Xylene from GS Caltex and Butyl cellosolve from Yeocheon NCC are mixed in a weight ratio of 2:1)
4: Dispersant (Disperbyk 182 by BYK)
5: Defoamer (BYK-054 by BYK)

4. Preparation of heat-resistant paint composition using polysiloxane resin of Example 3

Mix in the same composition as in Table 4 below, but mix each polysiloxane resin, pigment, solvent and additives (dispersant, antifoaming agent) at the content (unit: g) shown in Table 4 below in a 1L container, and stir for 1 hour. Then, a heat-resistant paint composition was completed.

ingredient production example
7 production example
8 production example
9 Comparative Preparation Example 5 Comparative Preparation Example 6 ¹ polysiloxane resin 30 35 40 25 45 ² pigment 20 15 10 25 5 ³ solvent 46 46 46 46 46 ⁴ dispersant 2 2 2 2 2 ⁵ Antifoam 2 2 2 2 2
main)
1: Polysiloxane resin (Example 3)
2: Pigment (Tiona RCl 575 from Cristal)
3: Solvent (Xylene from GS Caltex and Butyl cellosolve from Yeocheon NCC are mixed in a weight ratio of 2:1)
4: Dispersant (Disperbyk 182 by BYK)
5: Defoamer (BYK-054 by BYK)

5. Preparation of heat-resistant paint composition using polysiloxane resin of Example 4

Mix in the same composition as in Table 5 below, but mix each polysiloxane resin, pigment, solvent and additives (dispersant, antifoaming agent) at the content (unit: g) shown in Table 5 below in a 1L container, and stir for 1 hour Then, a heat-resistant paint composition was completed.

ingredient production example
10 production example
11 production example
12 Comparative Preparation Example 7 Comparative Preparation Example 8 ¹ polysiloxane resin 30 35 40 25 45 ² pigment 20 15 10 25 5 ³ solvent 46 46 46 46 46 ⁴ dispersant 2 2 2 2 2 ⁵ Antifoam 2 2 2 2 2
main)
1: Polysiloxane resin (Example 4)
2: Pigment (Tiona RCl 575 from Cristal)
3: Solvent (Xylene from GS Caltex and Butyl cellosolve from Yeocheon NCC are mixed in a weight ratio of 2:1)
4: Dispersant (Disperbyk 182 by BYK)
5: Defoamer (BYK-054 by BYK)

6. Preparation of heat-resistant paint composition using polysiloxane resin of Comparative Example 1

Mix in the same composition as in Table 6 below, but mix each polysiloxane resin, pigment, solvent and additives (dispersant, antifoaming agent) at the content (unit: g) shown in Table 6 below in a 1L container, and stir for 1 hour Then, a heat-resistant paint composition was completed.

ingredient Comparative Preparation Example 9 Comparative Preparation Example 10 Comparative Preparation Example 11 ¹ polysiloxane resin 30 35 40 ² pigment 20 15 10 ³ solvent 46 46 46 ⁴ dispersant 2 2 2 ⁵ Antifoam 2 2 2
main)
1: Polysiloxane resin (Comparative Example 1)
2: Pigment (Tiona RCl 575 from Cristal)
3: Solvent (Xylene from GS Caltex and Butyl cellosolve from Yeocheon NCC are mixed in a weight ratio of 2:1)
4: Dispersant (Disperbyk 182 by BYK)
5: Defoamer (BYK-054 by BYK)

7. Preparation of heat-resistant paint composition using polysiloxane resin of Comparative Example 2

Mix in the same composition as in Table 7 below, but mix each polysiloxane resin, pigment, solvent and additives (dispersant, antifoaming agent) at the content (unit: g) shown in Table 7 below in a 1L container, and stir for 1 hour Then, a heat-resistant paint composition was completed.

ingredient Comparative Preparation Example 12 Comparative Preparation Example 13 Comparative Preparation Example 14 ¹ polysiloxane resin 30 35 40 ² pigment 20 15 10 ³ solvent 46 46 46 ⁴ dispersant 2 2 2 ⁵ Antifoam 2 2 2
main)
1: Polysiloxane resin (Comparative Example 2)
2: Pigment (Tiona RCl 575 from Cristal)
3: Solvent (Xylene from GS Caltex and Butyl cellosolve from Yeocheon NCC are mixed in a weight ratio of 2:1)
4: Dispersant (Disperbyk 182 by BYK)
5: Defoamer (BYK-054 by BYK)

8. Preparation of test specimens

Each heat-resistant paint composition was applied to a steel sheet having a size of 7 cm X 15 cm using an electrostatic spraying device so that the thickness of the coating film was 100 μm. Thereafter, the coating layer was cured at 230° C. for 10 minutes to prepare a test specimen.

9. Testing and Evaluation Methods

For the test specimens prepared as described above, curing, adhesion, hardness, solvent resistance, stain resistance, shrinkage resistance, flame retardancy and smoothness of the coating film were evaluated through the method described below, and the results are shown in Table 8.

Experimental environment conditions

The test environment, that is, the place where the test is conducted, should be in a place where there is no direct sunlight and very little gas, steam, dust and ventilation at a temperature of 20±2℃ and a humidity of 65±5% (hereinafter referred to as ‘room temperature’). In principle, those left for more than 72 hours after painting were used for the experiment.

Hardenability evaluation

It was checked whether a nail scratch occurred by scraping the coating film of the cured test specimen with a nail. If a nail scratch occurred, it was evaluated as poor curability, and if it did not occur, it was evaluated as good.

Adhesion evaluation

A cross-cutting test method was performed on the cured coating film of the test specimen, and a glass tape was used in this case. That is, the film or layer formed on the specimen is cut into 100 checkered slices with a size of 1 mm * 1 mm, and a glass tape is attached to the slice. gender was evaluated.

Hardness evaluation

For hardness evaluation, a 45° inclination using a Mitsubishi pencil and a 1 kg load were applied to evaluate whether the coating film was abnormal when moved 2 cm. When evaluating 5 times, if the maximum pencil hardness value is 3H or more (ie, 3H or harder than 3H) when there are no scratches in all 5 times, the hardness is evaluated as good, and if less than 3H (ie, if it is softer than 3H) The hardness was evaluated as poor.

Solvent resistance evaluation

Methyl ethyl ketone was applied to the gauze, and a certain force was applied to the specimen on which the coating film was formed to rub the gauze, and then the number of times the gauze was rubbed until the coating film was peeled off to reveal the substrate was measured.

Contamination resistance evaluation

To evaluate the stain resistance, the surface of the coating film formed on the test specimen was contaminated with oily magic, and after 30 seconds, a constant force was applied to remove the magic marks with a tissue, and then the surface condition of the coating film was visually evaluated. That is, if traces of magic marks remain on the surface of the coating film, the stain resistance was evaluated as poor, and if not, it was evaluated as good.

Shrink resistance (crack resistance) evaluation

Each heat-resistant coating composition is applied to a steel plate of 7cm X 15cm in size using electrostatic spray equipment so that the thickness of the coating film becomes 100㎛, and immediately after curing the coating layer at 230℃ for 10 minutes, visually inspect whether or not cracks occur in the coating film. Thus, if cracks did not occur, the shrinkage resistance was evaluated as good, and if it did, the shrinkage resistance was evaluated as poor.

Flame-retardant evaluation

When measured by the non-combustible test method (KS F ISO 1182), the mass reduction rate is 30% or less, and when measured by the gas toxicity test method (KS F 2271), the gas toxicity (average behavior of rats due to the combustion gas of the specimen when 8 rats are observed If the stop time) is 11 minutes or more, the flame retardancy is evaluated as excellent, and if all of the above conditions are not satisfied, the flame retardancy is evaluated as poor.

smoothness evaluation

Evaluate the degree to which the presence of surface curvature is felt when the painted surface of the cured specimen is touched by hand. If the surface curvature can be clearly felt by touch, the surface smoothness is poor, and the surface smoothness is excellent because the presence of surface curvature cannot be felt. It was evaluated as good.

division hardenability adherence Hardness solvent resistance stain resistance shrinkage resistance flame retardant smoothness Preparation Example 1 Good 95/100 Good Episode 45 Good Good Great Good Preparation 2 Good 95/100 Good Episode 46 Good Good Great Good Preparation 3 Good 95/100 Good Episode 46 Good Good Great Good Preparation 4 Good 95/100 Good Episode 46 Good Good Great Good Preparation 5 Good 95/100 Good Episode 47 Good Good Great Good Preparation 6 Good 95/100 Good Episode 57 Good Good Great Good Preparation 7 Good 98/100 Good Episode 48 Good Good Great Good Preparation 8 Good 99/100 Good Episode 49 Good Good Great Good Preparation 9 Good 98/100 Good Episode 49 Good Good Great Good Preparation 10 Good 99/100 Good 50 episodes Good Good Great Good Preparation 11 Good 99/100 Good 50 episodes Good Good Great Good Preparation 12 Good 100/100 Good 50 episodes Good Good Great Good Comparative Preparation Example 1 Good Unable to measure due to cracking Unable to measure due to cracking Unable to measure due to cracking error error Great Good Comparative Preparation Example 2 Good 100/100 error 40 episodes Good Good Great Good Comparative Preparation Example 3 Good Unable to measure due to cracking Unable to measure due to cracking Unable to measure due to cracking error error Great Good Comparative Preparation Example 4 Good 100/100 error Episode 42 Good Good Great Good Comparative Preparation Example 5 Good Unable to measure due to cracking Unable to measure due to cracking Unable to measure due to cracking error error Great Good Comparative Preparation Example 6 Good 100/100 error Episode 43 Good Good Great Good Comparative Preparation Example 7 Good Unable to measure due to cracking Unable to measure due to cracking Unable to measure due to cracking error error Great Good Comparative Preparation Example 8 Good 100/100 error Episode 38 error Good Great Good Comparative Preparation Example 9 Good 95/100 error Episode 48 Good Good Great Good Comparative Preparation Example 10 Good 95/100 error Episode 48 Good Good Great Good Comparative Preparation Example 11 Good 94/100 error Episode 49 Good Good Great Good Comparative Preparation Example 12 Good 90/100 Good Episode 42 error error Great Good Comparative Preparation Example 13 Good 90/100 Good Episode 42 error error Great Good Comparative Preparation Example 14 Good 95/100 Good Episode 43 error error Great Good

As shown in Table 8, Preparation Examples 1 to 12 of the present invention confirmed that the surface properties of the coating film were generally excellent in curability, adhesion, hardness, solvent resistance, stain resistance, shrinkage resistance, flame retardancy and smoothness. can And, through the experimental results of Comparative Preparation Examples 1 to 8, when the content of each component included in the coating composition exceeds or is less than the input amount range for each component, it can be confirmed that the surface properties of the coating film are relatively lowered compared to those of Preparation Examples. can In addition, looking at the results of Comparative Preparation Examples 9 to 14, even if the content of the polysiloxane resin is set to be the same as in Preparation Examples, when the content of each organosilane added during the preparation of the polysiloxane resin is outside a specific range, the coating film properties are lowered it can be seen that

10. Further fabrication of test specimens and determination of inorganic content

Each of the polysiloxane resins of Examples 1 to 4 was applied to a steel sheet having a size of 7 cm X 15 cm with an electrostatic spraying device so that the thickness of the coating film was 100 μm. Thereafter, the coating layer was cured at 230° C. for 10 minutes to prepare a test specimen. The prepared specimen was put into a thermogravimetric analysis, and inorganic content was measured at a high temperature of 750° C. or higher. Table 9 shows the results of the measured mineral content.

division Example 1 Example 2 Example 3 Example 4 mineral content 73% by weight 71% by weight 71% by weight 70% by weight

As can be seen from the measurement results in Table 9, the polysiloxane resins of Examples 1 to 4 had an inorganic material content of 70% by weight or more that remained even at a high temperature of 750° C. or higher, so it could be seen that the inorganic material was contained in a high ratio in the polysiloxane resin. .

11. Additional fabrication of test specimens and evaluation of physical properties

Mix in the same composition as in Table 10, but mix each polysiloxane resin, pigment, solvent and additives (dispersant, antifoaming agent) at the content (unit: g) shown in Table 10 in a 1L container, and stir for 1 hour. Then, a heat-resistant paint composition was completed. Thereafter, the heat-resistant coating composition was applied to a steel sheet having a size of 7 cm X 15 cm by using an electrostatic spraying device, and each was applied so that the thickness of the coating film was 100 μm. Thereafter, the coating layer was cured at 230° C. for 10 minutes to prepare a test specimen. The prepared test specimens were evaluated for sclerosis, adhesion, hardness, solvent resistance, stain resistance, shrinkage resistance, flame retardancy and smoothness of the coating film in the same manner as in the above evaluation method, and the results are shown in Table 11.

ingredient Comparative Preparation Example 15 Comparative Preparation Example 16 ¹ polysiloxane resin 40 40 ² pigment 10 10 ³ solvent 46
(Butyl Cellosolve used alone) 46
(The weight ratio of xylene to butyl cellosolve is 4:1) ⁴ dispersant 2 2 ⁵ Antifoam 2 2
main)
1: Polysiloxane resin (Example 4)
2: Pigment (Tiona RCl 575 from Cristal)
3: Solvent (Xylene from GS Caltex, Butyl cellosolve from Yeocheon NCC)
4: Dispersant (Disperbyk 182 by BYK)
5: Defoamer (BYK-054 by BYK)

division hardenability adherence Hardness solvent resistance stain resistance shrinkage resistance flame retardant smoothness Comparative Preparation Example 15 evaluation
impossible evaluation
impossible evaluation
impossible evaluation
impossible evaluation
impossible evaluation
impossible not rated not rated Comparative Preparation Example 16 Good 94/100 Good Episode 45 Good Good Great error

As shown in Table 11, in Comparative Preparation Example 15, in which butyl cellosolve was used alone in the solvent, it was difficult to adjust the resistance value of the paint to a level suitable for electrostatic painting, and an operation error occurred in the electrostatic spray equipment, so that the painting itself was not performed, so a coating film could not be formed. In Comparative Preparation Example 16, in which xylene and butyl cellosolve were mixed in a weight ratio of 4:1, it was confirmed that the coating film smoothness was lowered due to the excessive addition of xylene.

As described above, according to various embodiments of the present invention, since the coating composition is prepared using polysiloxane resins prepared by reacting different types of organosilanes, the content of inorganic substances contained in the heat-resistant coating composition is increased to improve heat resistance and flame retardancy. It has an excellent effect.

In addition, according to various embodiments of the present invention, when preparing a polysiloxane resin, phenyltrimethoxysilane is added in a certain amount to methyltrimethoxysilane and reacted together to synthesize a polysiloxane resin, or phenyltrimethoxysilane to methyltrimethoxysilane By adding a certain amount of oxysilane and 3-(meth)acryloxypropyltrimethoxysilane and reacting it to synthesize a polysiloxane resin, the content of inorganic substances in the heat-resistant paint composition is maintained high while improving the stability and compatibility of the paint and further improving the heat resistance characteristics. It can be improved, and there is an advantage in that the coating film properties such as curability, adhesion, hardness, solvent resistance, and stain resistance are excellent. Moreover, the heat-resistant paint composition according to various embodiments of the present invention does not include a separate polymer resin, but has excellent shrink resistance and crack resistance, so that cracks do not occur on the surface of the coating film when cured at a high temperature of 200° C. or higher.

In addition, according to various embodiments of the present invention, since the inorganic content is relatively higher than the organic content, the amount of carbonization during combustion is small and the amount of harmful gas generated is excellent in flame retardancy. Therefore, it is possible to prepare a coating body having a beautiful appearance and excellent flame retardancy by coating a heat-resistant paint composition on an article requiring heat resistance.

In addition, the coating composition according to various embodiments of the present invention satisfies the important physical properties of shrinkage resistance, crack resistance, hardness, coating properties, etc. as a high-temperature baking type heat-resistant coating agent, and reduces the content of organic matter in the paint and reduces stability and compatibility It is possible to further improve the heat-resistance characteristics by increasing

As described above, the detailed description of the present invention has been made by way of examples, but since the above-described exemplary embodiments have only been described with preferred examples of the present invention, it should not be understood that the present invention is limited only to the above examples. No, the scope of the present invention should be understood as the following claims and their equivalents.

Claims (7)

30-40 parts by weight of polysiloxane resin;
10-20 parts by weight of pigment; and
45-50 parts by weight of a solvent; characterized in that it contains
A heat-resistant paint composition with improved crack resistance. According to claim 1,
The heat-resistant paint composition is
Additives 4 to 10 parts by weight; characterized in that it further comprises
A heat-resistant paint composition with improved crack resistance. According to claim 1,
The polysiloxane resin is characterized in that it is prepared by reacting different types of organic silanes.
A heat-resistant paint composition with improved crack resistance. 4. The method of claim 3,
The organic silane is methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, i-propyltrimethoxysilane Silane, i-propyltriethoxysilane, n-butyltrimethoxysilane, n-butyltriethoxysilane, n-pentyltrimethoxysilane, n-hexyltrimethoxysilane, n-heptyltrimethoxysilane, n-Octyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, cyclohexyltrimethoxysilane, cyclohexyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, 3-chloropropyl Trimethoxysilane, 3-chloropropyltriethoxysilane, 3,3,3-trifluoropropyltrimethoxysilane, 3,3,3-trifluoropropyltriethoxysilane, 3-aminopropyltrime Toxysilane, 3-aminopropyltriethoxysilane, 2-hydroxyethyltrimethoxysilane, 2-hydroxyethyltriethoxysilane, 2-hydroxypropyltrimethoxysilane, 2-hydroxypropyltriethoxy Silane, 3-hydroxypropyltrimethoxysilane, 3-hydroxypropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-isocyanatepropyltrimethoxysilane , 3-isocyanate propyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2 -(3,4-epoxycyclohexyl)ethyltriethoxysilane, 3-(meth)acryloxypropyltrimethoxysilane, 3-(meth)acryloxypropyltriethoxysilane, 3-ureidopropyltrimethoxy Silane, 3-ureidopropyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, diethyldimethoxysilane, diethyldiethoxysilane, di-n-propyldimethoxysilane, di-n-propyldiethoxy Silane, di-i-propyldimethoxysilane, di-i-propyldiethoxysilane, di-n-butyldimethoxysilane, di-n-butyldiethoxysilane, di-n-pentyldimethoxysilane, di-n -pentyldiethoxysilane, di-n-hexyldimethoxysilane, di-n-heptyldimethoxysilane, di-n-heptyldiethoxysilane, di-n-octyldimethoxysilane, di-n-octyldiethoxysilane , di-n-cyclohexyldimethoxysilane, di-n-cyclohexyldiethoxysilane, diphene characterized in that at least one selected from the group consisting of nyldimethoxysilane and diphenyldiethoxysilane
A heat-resistant paint composition with improved crack resistance. 5. The method of claim 4,
The polysiloxane resin is prepared by reacting 20-25 parts by weight of the methyltrimethoxysilane, 15-25 parts by weight of the phenyltrimethoxysilane, and 30-65 parts by weight of an organic solvent,
The organic solvent is at least one selected from the group consisting of xylene, butyl acetate, butyl cellosolve, ethyl alcohol, isopropyl alcohol, butyl alcohol, methyl ethyl ketone, methyl isobutyl ketone and propylene glycol monomethyl ether acetate. characterized by
A heat-resistant paint composition with improved crack resistance. 5. The method of claim 4,
The polysiloxane resin comprises 20 to 25 parts by weight of the methyltrimethoxysilane, 10 to 20 parts by weight of the phenyltrimethoxysilane, 5 to 10 parts by weight of the 3-(meth)acryloxypropyltrimethoxysilane, and 30 parts by weight of an organic solvent. Prepared by reacting ~65 parts by weight,
The organic solvent is at least one selected from the group consisting of xylene, butyl acetate, butyl cellosolve, ethyl alcohol, isopropyl alcohol, butyl alcohol, methyl ethyl ketone, methyl isobutyl ketone and propylene glycol monomethyl ether acetate. characterized by
A heat-resistant paint composition with improved crack resistance. A coating step of applying the heat-resistant paint composition according to any one of claims 1 to 6 to an object to be coated; and
A curing step of curing the coating layer formed in the coating step; characterized in that it comprises
A method for producing a coating body using a heat-resistant paint composition.

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