JPH02167376A - Film reparative agent an method for repair using the same - Google Patents

Abstract

PURPOSE:To obtain a film reparative agent, consisting essentially of a nondrying oil and silicone resin and useful for repairing defect parts caused by scratches, etc., occurring on matte coated surfaces. CONSTITUTION:The objective reparative agent consisting essentially of a nondrying oil (e.g. castor or olive oil) and a silicone resin (e.g. straight-chain dimethylpolysiloxane or methylphenylpolysiloxane). The above-mentioned reparative agent is applied to defect parts caused by scratches, etc., on matte clear or colored coated surfaces to carry out repair thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the repair of paint films, and more particularly to a repair agent useful for repairing defects caused by scratches and the like occurring on matte painted surfaces, and a repair method using the same.

BACKGROUND OF THE INVENTION The outer panels of building materials, household goods, office equipment, etc. are often painted to have a low gloss, so-called "matte" surface, in order to improve their cosmetic appearance. Its glossiness is often 60% or less based on 60 degree specular reflectance.

Even on the above-mentioned outer panel, which has a matte painted surface, there may be scratches, scratches, etc. on the painted surface during transportation or handling.
Scratches (in this specification, these are collectively referred to as "scratches, etc.") are likely to occur, thereby degrading the appearance.

Traditionally, scratches and other scratches that occur on matte painted surfaces have been repaired by applying an acrylic lacquer containing polyethylene wax or silica powder that dries and hardens when the solvent evaporates at room temperature. However, it is difficult to match the gloss level of the non-repaired area, the applied coating liquid tends to flow down and it is not easy to finish the coated surface uniformly, and if the film thickness changes, the level of gloss becomes dull. However, there is a strong desire to develop a drastic repair method for matte painted surfaces.

Therefore, the present inventors conducted intensive research on a method of repairing a matte coating film that eliminates the above-mentioned defects, and as a result, achieved the objective and completed the present invention.

That is, the present invention relates to (1) a coating repair agent containing a non-drying oil and a silicone resin as main components, and (2) a method for repairing a matte clear coated surface or a colored coated surface.

The coating repair agent of the present invention is a liquid composition containing a non-drying oil and a silicone resin as main components.

First, non-drying oils are substances that are liquid at room temperature and do not harden into a solid state by themselves or by heating. Specifically, non-drying oils are organic oils such as fatty oils (for example, castor oil and olive The iodine value of
0 or less) and mineral oils (inorganic oily substances) such as machine oil and gear oil. Incidentally, waxes such as paraffin, katabara wax, carnauba wax, and polyethylene wax are unsuitable for repairing matte coatings.

Next, silicone resin is a compound having a siloxane bond in its molecule, and can be used in the form of liquid or fine powder at room temperature, for example,
■Silicone oils such as linear dimethylpolysiloxane, methylphenylpolysiloxane, methylalkylpolysiloxane, and methylvinylpolysiloxane, ■Organopolysiloxanes with a three-dimensional network structure, ■Stearic acid in the silicone oil from ■ above. Examples include silicone greases containing metal soaps such as sodium and lithium stearate, and fatty acid diesters ■Polyester-modified polydimethylsiloxane.

Further, the combination of the non-drying oil and the silicone resin is not particularly limited, but it is preferable to use a silicone resin that is completely or almost incompatible with the non-drying oil.

Although the composition ratio of the above-mentioned circumferential components can be arbitrarily selected, for example,
40-60% by weight of non-drying oil, based on its total weight
, the silicone oil is preferably in the range of 60 to 40% by weight.

The method of mixing the surrounding components can be carried out arbitrarily, and in the case of a yarn in which the surrounding components are incompatible, it is desirable that fine particles (liquid or solid) of the silicone resin are dispersed in the non-drying oil.

Furthermore, the coating repair agent of the present invention can be obtained by mixing the above peripheral components, and an organic solvent may be used in combination with the peripheral components. These solvents may be compatible with either or both of the above-mentioned peripheral components, but may be incompatible with each other.

The paint film repair agent of the present invention is useful for repairing scratches and the like that occur on matte painted surfaces. In other words, when the repair agent is applied to areas such as scratches, it penetrates and moistens the cracks, scratches, etc., and as a result, the whitening phenomenon caused by the scratches, etc. disappears, and the gloss of the repaired area is also different from other areas. Therefore, defects such as scratches are eliminated. The amount of application is determined so that the repair agent penetrates into areas such as scratches,
It is sufficient to wet the area, and it is preferable to wipe off any excess applied.

In this repair agent, the non-drying oil easily penetrates into areas such as scratches and does not volatilize, so it does not volatilize even after a long period of time.On the other hand, by mixing the silicone resin, the non-drying oil It becomes possible to make the coating film matte, and the degree of matteness can be easily adjusted by adjusting the amount of silicone resin blended. Therefore, when scratches etc. occur on a painted surface with a matte finish, by applying the above-mentioned repair agent to the scratched area (painted surface) and removing the excess as necessary, the gloss will be restored based on the phenomenon described above. Scratches and the like disappear without changing the gloss of the eraser coating, and the scratches and the like are hardly or not visible at all. Moreover, by applying the repair agent, weather resistance, water resistance, etc. can be improved.

As long as the coating surface to which the coating repair agent of the present invention can be applied, the outermost coating layer may be either transparent or colored (including metallic). The most preferable method for applying the repair agent is to rub it into the scratched area (painted surface) with a cloth or foam impregnated with the repair agent; It can also be applied by wiping off the excess.

Examples 1 to 2 Paint film repair agents of the present invention were obtained based on the components and blending ratios (weight) shown in Table 1.

Table (*1) Non-drying oil: (a): “Bonnock #1800” (Nippon Oil ■ part name, mineral oil, molecular weight 38o) (b): “Faircoal #32” (same mineral oil, molecular weight 200) ( *2) Silicone resin (a) Polyester-modified polydimethylsiloxane (b)
Dimethylpolysiloxane Examples 3 to 4 Scratches were made on the film coated with acrylic melamine resin anion electrodeposition paint (matte clear) and cured by heating using #400 waterproof paper.

Next, an appropriate amount of the above repair agents (A) and (B) was applied to the scratched area using a sponge, and when the excess repair agent was wiped off with gauze, the scratch disappeared and a good repair finish was obtained.

Test results:

Claims (2)

[Claims] (1) A paint film repair agent whose main components are non-drying oil and silicone resin. (2) A paint film repair method, which comprises repairing defective areas such as scratches on a matte clear coated surface or a colored coated surface by applying the repair agent according to claim (1).