JP2000345109A - Peelable coating material having excellent appearance and peeling properties - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a peelable coating material that has excellent transparency, gloss, smoothness, and the like, of a coating film formed therefrom, and also can contribute to the improvement in design of coated matters. SOLUTION: This peelable coating material comprises 5-95 wt.% of a coating film-forming resin, 0.1-50 wt.% of a surfactant, and a trace amount of a defoaming agent, a leveling agent, an ultraviolet absorber and an organic solvent for dilution. The peelable coating material is adjusted in its viscosity with an organic solvent according to machine parts to be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to various objects such as metal, glass, plastics, and painted objects.
The present invention relates to a peelable paint which temporarily protects them from external mechanical and chemical damages and can be peeled off as a free film after fulfilling the purpose.

[0002]

2. Description of the Related Art Peelable paints are paints that are applied to metal products such as mechanical and electrical parts, plastic products, and rubber products to form a coating film, and to prevent scratches, contamination, and rust. After the purpose is achieved, it can be easily peeled off. The raw materials for this coating material are solvent-drying type solvents such as vinyl copolymer resins and ethylcellulose resins, and two-pack type polyol / isocyanate curing for protecting automotive coatings, and other vinyl resins. It was an aqueous system such as a copolymer emulsion or a synthetic rubber latex. These resins are required to have a low adhesive strength to an object to be coated and to have excellent breaking strength of a formed coating film so that the resin can be easily peeled off.

[0003] In the case of water-based paints, these peelable paints are excellent in the ease of peeling at the time of peeling, but they take time to cure and dry because water is used as a diluting solvent. In the case of the emulsion type, a completely transparent coating film could not be obtained and the appearance was poor. Further, since the film has inferior performance such as water resistance and weather resistance, when used outdoors, the coating film is severely deteriorated, and it is difficult to peel off the film.

[0004] As an example of a peelable paint for protecting a coating film of a new car of an automobile, a paint or the like which rapidly cures a relatively low-molecular polyol and an isocyanate prepolymer using an active amine is used. They are excellent in weather resistance and have good peelability after a long period of time, so they are most suitable for this application. However, since it is necessary to spray active amine and resins at the same time, a special two-part proportional spray A painting machine such as a gun is required. Further, since it was of a type in which a coloring pigment such as titanium oxide was kneaded in order to increase weather resistance, it was not satisfactory in terms of improving aesthetic appearance like a general paint.

[0005] In addition, an organic solvent-soluble vinyl-based or cellulose-based resin, which is very common as a peelable paint, can form a transparent film, has a high coating film strength, and has an immediate curability by selecting an organic solvent. Easy to apply. However, there is a difficulty in the most important peelability, and there is a possibility that it is extremely difficult to peel off a long-term coating film in particular.

As described above, various strippable paints of the prior art were able to exhibit their performance under very limited conditions. was difficult. If the coating method can be applied with a simple method such as a brush or a roller, the coating has sufficient toughness to protect the object to be coated, and can be easily peeled off even after a long period of time. Paints can be very easy to use and can be used for general purposes. In addition, if the appearance of the coating film is close to that of a general coating film, the application purpose can contribute not only to the protective film of the object to be coated but also to the improvement of aesthetic appearance.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve these problems, and has been developed to solve the above-mentioned problems. )), And to provide a peelable coating composition that can control the adhesive strength to the object to be coated without impairing the physical strength and appearance properties of the coating film and various properties such as coating work performance. The purpose is to: According to the present invention, it is possible to provide a peelable paint that can be used for a wide range of purposes by compensating for the drawbacks of the conventionally used peelable paint.

[0008]

In order to solve the above problems, the present invention provides an organic solvent-soluble resin of 5 to 95% by weight, a surfactant of 0.1 to 50% by weight, a trace amount of an antifoaming agent, Composition of a peelable paint composition comprising a leveling agent, an ultraviolet absorber, and an organic solvent for dilution, and a colored paint composition in which a coloring dye or a pigment is kneaded with the peelable paint composition for the purpose of improving design. The purpose is to provide the composition.

The resin soluble in an organic solvent of the present invention includes a vinyl-based copolymer resin, a cellulose-based resin, a urethane elastomer resin, a nylon resin, a linear polyester resin, a butyral resin, etc. Any resin having a breaking strength and a breaking elongation can be used. In addition, water-based resins for strippable paints are not the subject of the present invention because a surfactant described later is used as an emulsifier when the emulsion is originally purified. For two-component curable urethane resins used to protect new automotive coatings, etc.
The technique of the present invention can be applied, and in that case, it is desirable to modify the polyol component side by a modified technique. Also,
As practical peelable paints, aromatic hydrocarbon solvents, so as not to attack the coated surface of the object to be coated with these peelable paint solvents,
Those which do not contain strong solvents such as ester solvents, Kent solvents, ether solvents and cellosolve solvents are good.

In order to control the adhesive force between the resin for the peelable paint and the object to be coated, a surfactant is mixed. As this surfactant, anionic surfactant, cationic surfactant, nonionic surfactant can be used,
A nonionic surfactant is desirable from the viewpoint of compatibility with the film-forming resin, and among them, a liquid type of polyoxyethylene alkyl ethers having relatively high hydrophilicity is more preferable. These can be used in a wide range of 0.1 to 50% by weight, but if added in a range exceeding 5%, the strength of the coating film is reduced and the transparency of the coating film is also reduced. A range of 2% or less is appropriate.

In order to further improve the practicality of the peelable paint,
The following various auxiliary ingredients are added: First, by mixing a silicon-based leveling agent for smoothness of a coating film and an antifoaming agent as a foaming inhibitor for the coating film, the appearance of the coating film of the peelable paint becomes close to that of a general paint. For outdoor use, it is necessary to add an antioxidant and an ultraviolet absorber in order to impart weather resistance. The paint of the present invention is similar to the conventional peelable paint in that the coating is deteriorated by heat and ultraviolet rays, and the peelability is remarkably reduced when the coating becomes brittle. In addition, since general peelable paint resin has a high molecular weight and high viscosity, it is necessary to adjust the paint viscosity with an organic solvent for dilution according to the coating method.
The type depends on the type of film forming resin used, but when considering the effect on the object to be coated, those that do not contain strong solvents such as aromatic hydrocarbons, esters, ketones, and ethers Although it is desirable, when it is used for general purposes, it is most desirable to design it mainly with an alcohol-based solvent because it does not attack the object to be coated.

The peelable paint can be colored by mixing various colorant components. The addition of the above-mentioned surfactant,
Since the stability of the colorant components such as pigments and dyes in the coating is not impaired, the same coloring as that of a general coating is possible, and there is no problem in mixing aluminum powder, pearl powder and various metal powders. By adding these various design-imparting components, the peelable paint not only protects the object to be coated, but also leads to the improvement of design properties similar to general paints.

Further, glossiness and transparency are not required according to the purpose of use, and when the peelable paint is used exclusively as a protective material, a coating film such as a heating type foaming agent, talc, plastic powder, charcoal, etc. is formed. It is also possible to take measures to secure the film thickness by mixing a type of increasing type additive which does not react with the resin, various additives, or the like and does not lower the peeling performance.

In the present invention, a film-forming resin, a surfactant, various additives, and a colorant can be previously compounded as one liquid, if necessary. The diluting solvent may be added to the coating depending on the coating machine to be used and the desired coating viscosity, or may be adjusted to an arbitrary viscosity at the time of coating.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, various resins soluble in organic solvents have been described as having excellent coating workability and good appearance and gloss and transparency like general paints. It was stated that the peelability was not stable depending on the conditions. In the present invention, without reducing the advantages of those resins,
In order to obtain stable peelability, it is the kind and amount of the surfactant that controls the peel strength.

Since the above-mentioned various organic solvent-soluble resins have essentially no compatibility with a surfactant, the surfactant is added to the surface of the object to be coated and the surface of the coating after forming the cured film. Orient. This surfactant layer greatly affects the quality of the peelability. If the amount of the surfactant is increased, the peel strength decreases, and the peeling becomes easier.However, a decrease in the film forming strength, a turbidity of the coating film, or a decrease in the water resistance significantly deteriorates the weather resistance. May decrease. Also, a surfactant having a high hydrophilicity is good for improving the releasability, but may reduce the gloss of the coating film surface or cause cloudiness of the coating film when immersed in water. These problems can be solved by examining the type and amount of the surfactant.

To improve the releasability, an attempt was made to add a silicon-based or fluorine-based surface conditioner other than a surfactant. No formation was observed and the initial objective was not achieved. From this, as control of these peeling performance,
It was found that a surfactant is most suitable as a resin modifier, and that this surfactant is required to have an appropriate affinity and releasability for the resin used.

As an additional advantage, by adjusting the amount of these hydrophilic surfactants, the substrate can function as a strong general coating at the time of use of the object to be coated, and can be easily removed by using high-pressure washing water when stripping is desired. It has become possible to control the adhesive force such as peeling.

[0019]

EXAMPLES Examples and effects of the present invention will be described below with reference to examples and comparative examples. However, the exemplification is merely for explaining the present invention, and is not intended to limit the idea of the present invention.

A polyester polyol / isophorone diisocyanate-based urethane elastomer is used as a film-forming resin, and a polyoxyethylene higher alcohol ether-based nonionic surfactant is mixed for improving peeling to prepare a base for peelable paint. For the use of air atomization spray as a coating method, the peelable paint base described above was mixed using a mixed solvent of isopropyl alcohol / isobutyl alcohol,
Adjust for 12 seconds with a Ford Cup # 4 viscosity. If foaming or the like is observed in the test coating, a silicon-based antifoaming agent is added, and if it is desired to improve smoothness, a small amount of the same leveling agent is added.

When a color paint is used, a color paste obtained by kneading the urethane elastomer resin, the alcohol-based solvent and the color pigment is preferably prepared and mixed with the peelable paint base. In addition, translucent colored paints can be obtained by mixing alcohol-soluble dyes with the peelable paint base, and colored paints with metallic luster can be adjusted by mixing aluminum powder, pearl powder, and various metal powders. It is. For example, these are uncolored stainless steel and aluminum,
It is applied to changing the design for a certain period of time while retaining metallic luster by painting chrome plating on automobile tire wheels and bumpers.

[0022]

[Table 1]

[0023]

The strippable paint of the present invention not only protects the original object to be coated, but also can control the adhesive force according to the intended use, as well as the high transparency and gloss of the coating film.
By mixing a coloring agent for smoothness or the like, a unique paint having a design similar to that of a general paint can be obtained while being a peelable paint.

Claims (2)

[Claims] 1. A mixture of a film-forming resin (5 to 95%) and a surfactant containing a nonionic surfactant (0.1 to 50%), a defoaming agent, a leveling agent, an ultraviolet absorber, and an organic compound. A strippable coating composition comprising a solvent and the like. 2. A colored coating composition in which a pigment or dye is kneaded into the strippable coating composition of claim 1.