JPH0567751B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for painting joints on an exterior wall without causing cracks in the coating film on the exterior wall.

[Background Art] In the conventional case, as shown in FIG.
The joints 3 between the exterior materials 2 are filled with caulking material 4, and the surface of the caulking material 4 is coated with paint 8 for finishing. There was a problem that cracks 9 were generated in the coating film due to shrinkage force.

[Object of the invention] The present invention was made to solve the above problems, and its purpose is to absorb the shrinkage force of the paint applied to the surface of the caulking material, and to The purpose is to prevent cracks from occurring in the film, thereby improving quality and coating productivity.

[Disclosure of the Invention] The method of painting the joints of an exterior wall of the present invention includes filling the joints 3 between the exterior materials 2 of the exterior wall 1 with a caulking material 4, and then applying an undercoat paint to the surface of the caulking material 4. A coating film 5 is formed, and after cracks 6 occur on this undercoat film 5, a topcoat is applied to form a topcoat film 7. With this configuration, the above object can be achieved. It is something.
That is, the top coat is infiltrated into the cracks 6 formed in the undercoat film 5 of the undercoat, and the anchoring effect of the top coat absorbs the shrinkage force of the top coat during curing, thereby causing cracks in the top coat 7. It is possible to prevent this from occurring.

The present invention will be explained below based on the accompanying drawings.
A joint portion 3 is formed between the exterior materials 2 of the outer wall 1. First, the joint portion 3 is filled with a caulking material 4 such as a sealant, which is a modified silicone that tends to cause cracks in the paint film. Then,
An undercoat paint is applied to the surface of this caulking material 4 and cured at room temperature or by heating to form an undercoat film 5. In this case, as shown by arrows in FIG. 1, network-like cracks 6 are generated in the undercoat film 5 due to the shrinkage force of the undercoat due to hardening of the undercoat and the movement of the uncured caulking material 4. The depth of the crack 6 is shallow because the undercoat film 5 is formed thinly by applying approximately 10 to 20 g/m ² of undercoat paint. As the undercoat paint, a hard paint is preferable because it tends to cause cracks 6. Thereafter, a top coat is applied onto the undercoat 5 and cured to form a top coat 7, completing the finishing of the outer texture 1. In this case, the top coat paint penetrates into the cracks 6 of the undercoat film 5, and the top coat paint portions 7a that harden within the cracks 6 serve as anchors to bring the top coat film 7 into close contact with the undercoat film 5. This anchoring effect absorbs the shrinkage force of the coating film due to curing of the top coating material, thereby preventing cracks from occurring in the top coating film 7. Incidentally, by using an elastic paint such as an elastic acrylic paint or an elastic urethane paint as the top coat, the shrinkage force of the paint film can be absorbed and cracks can be made less likely to occur.

[Effects of the Invention] In the present invention, caulking material is filled in the joints between exterior wall materials, and then the undercoat paint is applied to the surface of the caulking material, so that there is no shrinkage of the paint film due to hardening of the undercoat paint. Cracks can occur in the undercoat film due to force and movement of uncured caulking material, and after cracks occur in the undercoat film, a topcoat is applied to form a topcoat film, so in this case, the topcoat is applied. The paint penetrates into the cracks of the undercoat, and the hardened topcoat within these cracks acts as an anchor, allowing the topcoat to adhere to the undercoat. It absorbs the shrinkage force of the film and does not cause cracks in the top coat, which improves the quality and productivity of exterior wall painting.

[Brief explanation of the drawing]

1 and 2 are plan sectional views showing the steps of an embodiment of the present invention, and FIG. 3 is a plan sectional view showing an outer wall according to a conventional example together with its function, in which 1 is an outer wall, 2
3 is an exterior material, 3 is a joint part, 4 is a caulking material, 5 is an undercoat film, 6 is a crack, and 7 is an overcoat film.

Claims (1)

[Scope of Claims] 1. A caulking material is filled in the joints between exterior wall materials, and then an undercoat is applied to the surface of the caulking material to form an undercoat film, and cracks occur in this undercoat film. A method for painting joints on exterior walls, which is characterized by subsequently applying a topcoat paint to form a topcoat film. 2. The method for painting joints in an exterior wall according to claim 1, wherein the caulking material is modified silicone.