Thermosetting paint composition, thermosetting paint film forming method and painting object

Abstract

The present invention provides a thermosetting paint composition, a thermosetting paint film forming method and a painting object, capable of reducing iota air bubble marks greatly and forming a paint film with excellent evenness. The thermosetting paint composition is coated on a surface of a porous material which coating face has a plurality of thin holes and is thermosetted to form the paint film, and contains a thermosetting resin component for forming the paint film by heating and solidifying, a dissolvant component for dissoluting the thermosetting resin component, and a paint film selfregeneration component. The paint film self regeneration component is heated after being coated by a paint in a first heating temperature range till a temperature of 110 DEG C, after the paint film ruptures due to the air bubbles of holes of the porous material, the paint film is melted to block the air bubbles in a second heating temperature range from 110 DEG C to a thermosetting temperature. The air bubble (14) is generated in the first heating temperature range, after breaking of the air bubble, the fluidness of the paint film is improved by the paint film self regeneration component in asecond heating temperature range to be melted again to form the smooth paint film (17).

Description

technical field

[0001] The present invention relates to a thermosetting coating composition that forms a good coating film on a material having fine pores on the surface such as die casting, a method for forming a thermosetting coating film, and a coated article. Background technique

[0002] Conventionally, when coating the surface of a porous material such as die casting, when the paint is applied and dried by heating, defects such as blisters and pinholes occur, resulting in a high failure rate.

[0003] The generation mechanism of the blisters, pinholes, etc. is considered to be as follows:

[0004] (1) A large number of fine pores exist near the surface of a porous material such as die casting.

[0005] (2) Fine pores communicate with the surface.

[0006] (3) There is moisture in the pores from the air (atmosphere) or the surface.

[0007] (4) If paint is applied to the surface, the outlet of the hole is covered, but the space inside the hole is rarely completely fi...

Examples

Embodiment approach

[0052] The thermosetting coating composition of the present invention is a thermosetting coating composition that forms a coating film by coating on the surface of a porous material having a plurality of fine pores on the coating surface and thermally curing it, including: forming a coating film by heating and curing The thermosetting resin component, the solvent component that dissolves the thermosetting resin component, and the self-regenerating component of the coating film. The self-regenerating component of the coating film is formed by heating in the first heating temperature range up to 110°C after the coating is applied. After bubbles in the pores of the material cause cracks in the coating film, the coating film remelts the components that block the bubbles in the second heating temperature range above 110°C and before the thermosetting temperature.

[0053] Here, the difference between the present invention and the prior art will be described using the drawings.

[0...

Embodiment 1

[0109] Example 1 is an example in which the addition of acetylmalic acid was 5% by weight. In the first heating temperature step (first heating step), the temperature was raised from 90 to 125°C over 30 minutes (temperature increase rate: 1.17°C / min). In addition, in the second heating temperature step (second heating step), the temperature was raised from 125°C to 160°C over 30 minutes (temperature increase rate: 1.17°C / min). In addition, in the third heating temperature step (third heating step), the resin was cured by heating at 160° C. for 20 minutes.

Embodiment 2

[0111] Example 2 is an example in which the addition of acetylmalic acid was 5% by weight. In the 1st heating temperature process (1st heating process), after holding at 90 degreeC for 10 minutes, it heated up to 125 degreeC over 5 minutes. Moreover, in the 2nd heating temperature process (2nd heating process), after holding at 125 degreeC for 10 minutes, it heated up to 160 degreeC over 5 minutes. And in the 3rd heating temperature process (3rd heating process), it heated at 160 degreeC for 20 minutes, and hardened resin.

technical field

[0001] The present invention relates to a thermosetting coating composition that forms a good coating film on a material having fine pores on the surface such as die casting, a method for forming a thermosetting coating film, and a coated article. Background technique

[0002] Conventionally, when coating the surface of a porous material such as die casting, when the paint is applied and dried by heating, defects such as blisters and pinholes occur, resulting in a high failure rate.

[0003] The generation mechanism of the blisters, pinholes, etc. is considered to be as follows:

[0004] (1) A large number of fine pores exist near the surface of a porous material such as die casting.

[0005] (2) Fine pores communicate with the surface.

[0006] (3) There is moisture in the pores from the air (atmosphere) or the surface.

[0007] (4) If paint is applied to the surface, the outlet of the hole is covered, but the space inside the hole is rarely completely fi...

Examples

Embodiment approach

[0052] The thermosetting coating composition of the present invention is a thermosetting coating composition that forms a coating film by coating on the surface of a porous material having a plurality of fine pores on the coating surface and thermally curing it, including: forming a coating film by heating and curing The thermosetting resin component, the solvent component that dissolves the thermosetting resin component, and the self-regenerating component of the coating film. The self-regenerating component of the coating film is formed by heating in the first heating temperature range up to 110°C after the coating is applied. After bubbles in the pores of the material cause cracks in the coating film, the coating film remelts the components that block the bubbles in the second heating temperature range above 110°C and before the thermosetting temperature.

[0053] Here, the difference between the present invention and the prior art will be described using the drawings.

[0...

Embodiment 1

[0109] Example 1 is an example in which the addition of acetylmalic acid was 5% by weight. In the first heating temperature step (first heating step), the temperature was raised from 90 to 125°C over 30 minutes (temperature increase rate: 1.17°C / min). In addition, in the second heating temperature step (second heating step), the temperature was raised from 125°C to 160°C over 30 minutes (temperature increase rate: 1.17°C / min). In addition, in the third heating temperature step (third heating step), the resin was cured by heating at 160° C. for 20 minutes.

Embodiment 2

[0111] Example 2 is an example in which the addition of acetylmalic acid was 5% by weight. In the 1st heating temperature process (1st heating process), after holding at 90 degreeC for 10 minutes, it heated up to 125 degreeC over 5 minutes. Moreover, in the 2nd heating temperature process (2nd heating process), after holding at 125 degreeC for 10 minutes, it heated up to 160 degreeC over 5 minutes. And in the 3rd heating temperature process (3rd heating process), it heated at 160 degreeC for 20 minutes, and hardened resin.

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