JP2000325875A - Treatment of painted surface of car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain over a long period of time the effect of a water-repellency coating film for protecting the surfaces of a coating film formed after polishing by means of a buffing compound and removing deposits. SOLUTION: The painted surface of a car is washed using preferably a car detergent, or the like, and polished using a buffing composition being a w/o type emulsion containing a surfactant, polishing particles, an oily component and water and then the water-repellency coating film is formed. The water- repellency coating film is formed by applying a water-repellency coating film forming agent containing wax and silicone compounds as principal components and further preferably a fluorine compound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a painted surface of an automobile. More specifically, the present invention relates to a method for treating an automotive painted surface that forms a water-repellent coating having excellent durability.

[0002]

2. Description of the Related Art When a paint film of an automobile is usually left in the natural world, contaminants such as dust, dust, mud, tar and pitch adhere thereto, and these contaminants cause countless fine scratches on the painted surface. Can be. Such scratches not only significantly reduce the gloss of the coating film, but also the contaminants are firmly fixed,
It works together with acid rain, sunlight, and oxygen, and chemically decomposes and degrades components on the coating film surface. Therefore, it is necessary to effectively remove contaminants adhering to the coating film and to quickly remove countless scratches on the coating surface. In this case, the sponge or brush was rubbed with water containing detergent to wash off the dirt and dust on the painted surface.However, this method alone was not enough to wash off the dirt and dust. Was. For this reason, the surface of the coating film has been slightly scraped off using a so-called buffing abrasive containing fine abrasive particles, thereby removing the adhered substances sticking to the coating film surface.

However, in the state polished with this buff abrasive, the coating film itself is liable to be deteriorated, and if left in this state, the surface of the coating film will be finely scratched again after several days. . For this reason, it is necessary to coat the buffed coating film surface with a wax agent or the like.

[0004]

[0005] However, durability is weak only by coating with a conventional wax agent,
There was a problem that the effect diminished immediately. In other words, even after buffing and coating,
After one month, the effect is lost. For this reason, a new car must be washed about once a month and a coating operation such as waxing must be performed again. It is necessary to sufficiently protect the surface of the coating film after buffing and removing adhered substances. could not.

The present invention has been made in view of the above-mentioned problems of the prior art, and maintains a coating effect for protecting a coating surface from which deposits have been removed by polishing with a buff abrasive for a long period of time. The purpose is to make

Accordingly, the present inventors have made intensive efforts,
An examination of the undercoating method, that is, a pretreatment method at the time of coating, has revealed that the coating effect can be maintained by using the buffing composition which is a W / O emulsion, and the present invention has been completed. Reached.

[0007]

According to the present invention, there is provided a method for treating a painted surface of an automobile, comprising the steps of:
It is characterized in that a water-repellent film is formed after the surface is polished using a buffing composition which is a W / O emulsion containing an oil component and water.

At this time, it is preferable to form a water-repellent film by applying a water-repellent film-forming agent containing wax and a silicone compound as main components. In this case, it is particularly desirable to use a water-repellent film-forming agent containing a fluorine compound.

Further, the present invention is characterized in that a water-repellent film is formed without wiping after surface polishing.

[0010] In the present invention, it is preferable to use one or more selected from the group consisting of alumina, silica, kaolin and diatomaceous earth as the abrasive particles. The thickness is preferably 0.1 to 50 μm.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is characterized in that a buffing abrasive, which is a W / O emulsion, is used as a pretreatment for a coating process. It is desirable to wash the painted surface. This washing step prevents new flaws and stains due to dust, dirt, tar and the like adhering to the painted surface.

[0012] As for the washing method, similarly to the conventional method, after the surface of the paint is wetted with water, the paint is applied using a commercially available car wash shampoo, car wash sponge, car wash brush and the like. It is conceivable to wipe off dirt such as dust and dust on the surface.

[0013] Shampoos for automobiles include anionic surfactants such as polyoxyethylene lauryl ether sulfate, alkylbenzene sulfonate and higher fatty acid soap, coconut oil fatty acid diethanolamide, polyoxyethylene nonylphenyl ether and alkyl glucoside. Examples thereof include those in which a nonionic surfactant is dissolved in water. It is preferable to apply the surface treatment according to the present invention to the coated surface thus washed.

The first step in the present invention is a step of polishing the surface of the coating using a buffing composition.
This step is a step of completely removing the deposits adhering to the coating surface and removing fine scratches on the coating surface, and is for the next second step, ie, the coating treatment. By this step, the durability of the subsequently formed water-repellent coating is improved.

The buffing composition used in this step is a buffing composition containing a surfactant, abrasive particles, an oily component and water, and is a W / O emulsion. The buffing composition is manufactured by combining a conventionally known surfactant, abrasive particles, and an oil component.

The surfactant is not particularly limited as long as it can form a W / O emulsion, and examples thereof include cationic surfactants such as aliphatic quaternary amine salts and higher alcohol sulfates. Anionic surfactants, amphoteric surfactants such as carboxybetaine, polyoxyethylene alkyl ethers and polyethylene glycol fatty acid esters, polyglycerin fatty acid esters,
Nonionic surfactants such as sorbitan fatty acid esters are included. Examples of these various fatty acid esters include esters with fatty acids such as lauric acid, palmitic acid, stearic acid, oleic acid, and sesquioleic acid.

These surfactants can be used alone or in combination of two or more. It is determined mainly depending on the oil component and the amount thereof, but the amount is generally 0.1 to 10% by weight, preferably 0.2 to 5% by weight in the composition.
It is.

Among these surfactants, nonionic surfactants are particularly preferably used. Nonionic surfactants are preferred because they have good compatibility with oily components and can easily adjust W / O emulsions. In particular, those having a low HLB (hydrophilic lipophilic balance), specifically those having an HLB of 1 to 9, are preferable because a W / O emulsion can be easily obtained and a stable emulsion can be obtained. Used.

The abrasive particles are not particularly limited as long as they can be conventionally used as a buffing composition. For example, alumina, silica, kaolin, diatomaceous earth, silica stone, diatomaceous earth, barlite, calcium carbonate , Zeolite, alumina, aluminum hydroxide, hydrous silicic acid, chromium oxide, titanium oxide, zinc oxide, iron oxide, zirconium oxide, silicon oxide, cerium oxide, magnesium oxide, calcium fluoride, bentonite, montmorillonite, shirasu balloon, mica, Examples include various natural and synthetic inorganic powders such as calcium silicate, zirconium silicate, diamond, glass, and ceramic. One or two or more of these can be used. Particularly, since they are available at low cost and stably, one or more of those selected from the group consisting of alumina, silica, kaolin, and diatomaceous earth are used. Is desirable. These abrasive particles make it possible to remove tar, mud, and surface oxides adhered to the painted surface.

If these abrasive particles are too large, they often cause deep scratches on the coating surface, whereas if they are too fine, the abrasive effect cannot be sufficiently exerted. In addition, since large particles settle out immediately, particles having a particle size of 50 μm or less, more preferably 20 μm or less, are used. Those having a diameter of less than 0.1 μm have almost no polishing effect. The particle size in the present invention means a value measured by volume conversion. Further, the particle size of 0.1 to 50 μm, when converted to volume,
It means that the particles in the range occupy 90% or more of the total volume of the whole particles in the compounding. In addition, the compounding amount of the abrasive particles is generally 5 to 5 in the buffing composition.
It is used within the range of 20% by weight.

The oil component is added to remove the oil component on the surface of the coating. Although not particularly limited as the oily component, for example, industrial gasoline, kerosene, mineral spirits, straight solvent, normal paraffinic or isoparaffinic, naphthenic, odorless various aliphatic solvents, chlorinated solvents, Examples include aromatic solvents, ester solvents, ether solvents, ketone solvents, alcohol solvents, glycol ether solvents, silicone solvents, and fluorine solvents. Since these are used after being emulsified with water, they are usually preferably used in a liquid state at normal temperature, but are not limited to liquid ones as long as the emulsified state can be kept uniform.
In order to eliminate the need for wiping after polishing, those having high volatility are more preferably used.

These oil components are emulsified in a medium consisting of water together with a surfactant to form a W / O emulsion. The amount of water is not particularly limited, but is preferably set to about 60% by weight or less.
When the blending amount of water is larger than this amount, the formed W /
The O-type emulsion may be easily separated, and the stability may be deteriorated.

The W / O emulsion is obtained by a conventional method. For example, water is poured into an oily component in which a surfactant has been dissolved in advance, and the emulsion is formed by sufficiently stirring, and then the abrasive particles are blended. It can be obtained by putting the agent into an oily component in which it has been dissolved in advance, and stirring it sufficiently. When considering the dispersibility of the abrasive particles,
Generally, the latter can obtain a stable buffing composition.

The viscosity of the buffing composition is adjusted as necessary in consideration of the coating efficiency and the like. The viscosity range at this time is usually 100 to 3000 centipoise,
Preferably, it is adjusted to 100 to 1000 centipoise. First, the viscosity can be easily adjusted by changing the type and amount of the oil component. In addition, various viscosity modifiers such as hydrous aluminum silicate, dimethyl dioctadecyl salt of montmorillonite clay, alkali-soluble acrylic polymer emulsion, colloidal silica, lead oleate, zinc oleate, zinc stearate, and aluminum stearate may be added. Can also be adjusted.

Of course, a buffing composition containing a polyhydric alcohol such as ethylene glycol or propylene glycol as a pigment, dye, perfume, or other stabilizer, preservative, or antifreeze in addition to the above-mentioned components may be used. They can be used.

The coated surface of an automobile is polished using such a hub polishing composition. Polishing is usually carried out by applying an appropriate amount of the polishing agent to a so-called polishing buff such as a sponge or a waste cloth, or by applying an appropriate amount of the polishing agent to a painted surface of an automobile and using the polishing buff. At this time, polishing is performed using a buff polishing machine, and the rotation speed of the buff is preferably 1000 to 2000 rpm. When the rotational speed is less than 1000 rpm, sufficient polishing power cannot be obtained, the surface polishing finish is poor, and the sustainability of the water-repellent coating cannot be improved. On the other hand, if it exceeds 2,000 rpm, the polishing power is too strong and the coating film is undesirably polished unnecessarily. In this manner, the paint surface is smoothed by scraping off the deposits and scratches that could not be sufficiently removed only by car washing, and then wiped off with a dry rag or the like. After that, the second step is performed. When a buffing abrasive, which is a W / O emulsion, is used, water droplets hardly remain on the polished surface, and when not necessary, the next step can be performed without wiping with a wiping cloth. You can also move.

In the present invention, polishing is preferably performed using a buff polishing composition containing a silicone compound which is an organopolysiloxane or various derivatives thereof.
Among them, the so-called silicone oil in the form of oil is preferably used. Examples of the silicone oil include dimethyl silicone oil and various modified silicone oils thereof, for example, methylphenyl-modified silicone oil, methyl hydrogen-modified silicone oil, alkyl-modified silicone oil, alkyl aralkyl-modified silicone oil, fluorine-modified silicone oil, and polyether-modified silicone oil. Silicone oil, alcohol-modified silicone oil, amino-modified silicone oil, epoxy-modified silicone oil, epoxy / polyether-modified silicone oil, phenol-modified silicone oil, carboxyl-modified silicone oil, mercapto-modified silicone oil, other methacryloxy, halogen, and alkoxy groups Modified with various organic functional groups such as carboxylic acid, ester group, amide group, imide group and methacryl group Recone oil and the like. These can be used alone or in combination of two or more. In addition, the amount of these compounds is 0.2
-20% by weight, preferably 0.5-10% by weight.
If the amount is less than 0.2% by weight, the effect of adding silicone oil cannot be sufficiently exerted. On the other hand, 20% by weight
When the value exceeds the above, the effect of the silicone oil becomes large and the silicone film remains. As a result, there is a greater possibility that the finished state after the surface treatment is deteriorated, for example, the water-repellent coating formed thereafter tends to be uneven. By blending such a silicone compound, polishing workability becomes easy.

In the second step of the present invention, a water-repellent film is formed by a water-repellent film-forming agent after removing adhering substances and fine scratches, to give a gloss to the polished surface and to remove dirt such as dust and dust. This is a step of preventing the substance from re-adhering.

In this step, for example, a water-repellent film-forming agent is uniformly applied to the coating surface smoothed in the first step using a sponge or the like, and then dried for about 5 to 15 minutes. Wiping with a clean rag or the like may be used.

The water-repellent film forming agent to be used is not particularly limited as long as it contains a wax and a silicone compound as main components and can form a water-repellent film.
Generally, it is commercially available as a car wax agent. Specifically, a product obtained by dissolving or mixing a polyethylene wax and a silicone compound in a petroleum-based solvent and having a high film-forming ability is preferably used.

Examples of the silicone compound include various organopolysiloxanes. Among them, dimethylpolysiloxane is particularly preferred, and modified dimethylpolysiloxane obtained by partially modifying dimethylpolysiloxane with an organic functional group is preferred. Used.

Examples of the modified dimethylpolysiloxane include amino-modified dimethylpolysiloxane, alkyl-modified dimethylpolysiloxane, alkylaralkyl-modified dimethylpolysiloxane, fluorine-modified dimethylpolysiloxane, epoxy-modified dimethylpolysiloxane, carboxy-modified dimethylpolysiloxane, and methacryloxy. Modified dimethylpolysiloxane, ester-modified dimethylpolysiloxane, amide-modified dimethylpolysiloxane, polyether-modified dimethylpolysiloxane, alcohol-modified dimethylpolysiloxane, phenol-modified dimethylpolysiloxane, methylphenyl-modified dimethylpolysiloxane, methylhydrogen-modified dimethylpolysiloxane And mercapto-modified dimethylpolysiloxane.

One or more of these silicone compounds may be used as a water-repellent film-forming agent in combination with a polyethylene wax, a surfactant, a solvent, and the like, if necessary. Furthermore, when considering the wiping workability as a finish and the hardness of the entire wax (easiness of application),
It is preferable to add a small amount of synthetic or natural wax to these.

Examples of such synthetic or natural waxes include beeswax, carnauba wax, candelilla wax, rice wax, wood wax, beeswax, and the like.
Examples include hydrocarbon waxes such as whale wax, lanolin, hydrogenated castor oil, ozokerite, ceresin, montan wax, microcrystalline, Fischer-Tropsch wax, polypropylene wax, paraffin wax, and derivatives thereof.

Further, in order to improve the fixability of the water-repellent coating to the coating surface, it is desirable to use those components further containing a fixing resin. The fixable resin is a resin that is dissolved or dispersed in a petroleum-based solvent, and is capable of fixing a film formed by curing by volatilization of the solvent to the surface of the coating film. A resin, a fluorine resin, an acrylic resin, an acrylic silicone resin, or the like is used, but is not limited to these resins.

Further, as the water repellent film forming agent, it is preferable to use a material to which a fluorine compound is added in order to further increase the water repellency. As the fluorine compound, for example,
Perfluoroalkyl polyethers and derivatives of various perfluoroalkyl polyethers having a hydroxyl group, carboxyl group, or isocyanate group introduced at the terminal of perfluoroalkyl polyether, and low-polymerized products of ethylene tetrafluoride or ethylene trifluoride. Can be. Among them, it is more preferable to use a fluorine compound modified with a hydroxyl group.
Such a fluorine compound modified with a hydroxyl group has excellent fixability to the above-mentioned polished surface, and can further improve the durability of the water-repellent coating.

As described above, by polishing the coated surface using the buffing composition which is a W / O emulsion, the subsequently formed water-repellent coating is sufficiently fixed on the coated surface. The durability of the water-repellent effect can be improved. In addition, since a buffing abrasive, which is a W / O emulsion, is used, polishing debris does not stick to the painted surface during polishing, and there is an advantage that the polishing operation can be easily performed. In particular, by blending the silicone oil in the buffing abrasive, the polishing operation is further facilitated, and the overall operation efficiency can be further improved.

[0038]

EXAMPLES Next, the present invention will be described in more detail with reference to Examples, but it goes without saying that the present invention is not limited to the following Examples.

Using a car (dark gray metallic car) that has just been purchased, its ceiling was subjected to the following surface treatment with a combination of a buffing abrasive and a water-repellent film-forming agent as shown in Table 1. .

After the vehicle was washed with an automobile shampoo, the painted surface was wiped off with a rag and the painted surface was dried. Thereafter, 2 g of the buffing composition was taken into a sponge buff and polished at a rotation speed of 1500 rpm using a polishing rotor. Then, a water-repellent film forming agent was applied immediately without wiping to form a water-repellent film. For film formation, 2 g of a water-repellent film-forming agent was used and spread evenly and thinly with a urethane sponge. After that, it was air-dried for about 15 minutes and polished with a clean cotton towel.

With respect to the durability of the water-repellent coating thus formed, the following test was conducted to confirm the effect of the present invention.

(Sustainability test) First, a water drop was dropped on the treated surface immediately after the surface treatment, and the shape of the water drop was confirmed. After that, park the vehicle outdoors and take about 10
The actual vehicle to prospect the 0km. After 1 month, 2 months and 3 months from the start of the test, after washing each car, the water repellency was confirmed in the same manner as immediately after the start of the test, and the maintenance of the coating effect was confirmed. As for the water repellency, the shape of the water droplet was compared with that immediately after the treatment, and the change in the water droplet shape was obtained as a good water droplet as in the initial stage (◎). The evaluation was made in four stages: spreading (○), water droplets spreading compared to the initial stage (△), and almost no water drops (x). The results are shown in Table 1. The buffing composition and the water-repellent film-forming agent were tested using the following compositions.

[Buff Polishing Composition] (Example 1) Component Name Compounding Amount (% by Weight) Sorbitan Sesquioleate (HLB: 3.7) 1.0 Tarpen Oil 25.0 Alumina 10.0 Water 59. 0 Ethylene glycol 5.0 Total 100.0

In the above components, ethylene glycol is added to water and dissolved by stirring, and then alumina is added to sufficiently disperse. Separately, sorbitan sesquioleate is added to turpentine oil and uniformly stirred and mixed. The dispersion was added to this liquid, and the mixture was stirred until it became uniform to obtain a W / O emulsion buffing composition.

(Example 2) Ingredient name Component amount (% by weight) Sorbitan sesquioleate (HLB: 3.7) 0.8 Dimethylpolysiloxane 5.0 Amino-modified dimethylpolysiloxane 0.5 Tarpen oil 23.7 Alumina 10.0 Water 55.0 Ethylene glycol 5.0 Total 100.0

In the above components, ethylene glycol is added to water and dissolved by stirring, and then alumina is added to sufficiently disperse. Separately, sorbitan sesquioleate, dimethylpolysiloxane, and amino-modified dimethylpolysiloxane are added to terpene oil and uniformly stirred and mixed. The dispersion is added to this liquid, and the mixture is stirred until it becomes uniform.
A buffing composition of the type emulsion was obtained.

(Comparative Example) Component name Compounding amount (% by weight) Sodium alkylbenzene sulfonate 3.0 Alumina 10.0 Tarpen oil 25.0 Water 67.0 Ethylene glycol 5.0 Total 100.0

In the above-mentioned components, sodium alkylbenzene sulfonate and ethylene glycol are added to water and dissolved by stirring, and alumina is added and sufficiently dispersed until uniform. While further stirring, add terpen oil and stir,
An O / W emulsion buffing composition was obtained.

(Water-Repellent Film Forming Agent 1) Component Name Compounding Amount (% by Weight) Tarpen Oil 87.7 Polyethylene Wax (Molecular Weight 655) 3.0 Carnauba Wax 0.3 Dimethylpolysiloxane (350cs) 3.5 Granular Polytetrafluoroethylene (particle size: about 0.3 μm, solid content: 50%) 5.0 Alkyl methacrylate copolymer (solid content: 25%) 0.5 Total: 100.0

The above component amounts were taken, dissolved by heating at about 110 ° C., and then cooled to room temperature to obtain a dispersed water-repellent film forming agent 1.

(Water-repellent film forming agent 2) Component name Compounding amount (% by weight) Tarpen oil 85.0 Polyethylene wax (molecular weight 655) 2.0 Polyethylene wax (molecular weight 500) 3.0 Dimethyl polysiloxane (1000 cs) 1.5) Dimethylpolysiloxane (10cs) 3.0 Granular polytetrafluoroethylene (particle diameter: about 4 μm, solid content: 50%) 5.0 OH-modified fluororesin solution (solid content: 45%) 0.5 Total 100.) 0

The above component amounts were taken, dissolved by heating at about 110 ° C., and then cooled to room temperature to obtain a dispersed water-repellent film forming agent 2.

(Water-Repellent Film Forming Agent 3) Component Name Compounding Amount (% by Weight) Tarpen Oil 94.0 Carnauba Wax 3.0 Dimethylpolysiloxane (350cs) 3.0 Total 100.0

The above component amounts were taken, dissolved by heating at about 110 ° C., and then cooled to room temperature to obtain a dispersed water-repellent film forming agent 3.

[Test Results] As can be seen from Table 1, O /
In the case where a surface abrasive which is a W-type emulsion was used, even when almost all water-repellent film-forming agents were used, water repellency was not observed after about one month, and a fluorine compound was added. Even when the water-repellent film-forming agent was used, no water repellency was observed after 2 months, and the coating effect could not be maintained.

On the other hand, in the method according to the present invention, when the water-repellent film-forming agent to which the fluorine compound was not added was used, the water-repellency tended to decrease gradually. The coating effect was sufficiently maintained. In addition, by adding the fluorine compound, the durability was improved, and especially when the OH-modified fluorine compound was added, the coating effect could be further maintained.

[0057]

[Table 1]

[0058]

According to the method for treating a car painted surface according to the present invention, a water-repellent film is formed after polishing using a buffing composition which is a W / O emulsion, and thus a water-repellent coating is formed. The effect of the water-repellent coating can be maintained for a long period of time. Further, the polishing operation can be completed in a short time without being hindered by polishing dust and the like, and the efficiency of the surface treatment operation can be improved.

This method is particularly effective for a water-repellent film composed of a water-repellent film-forming agent containing a wax and / or a silicone compound as a main component, and by using a film-forming agent containing a fluorine compound. The painted surface of the vehicle can be protected more effectively.

As described above, according to the present invention, not only the durability of the water-repellent coating film applied after the buffing operation can be further improved, but also the working efficiency of the surface of the automobile coating can be improved. is there.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09D 127/12 C09D 127/12 183/04 183/04 191/06 191/06 191/08 191/08 C09K 3/14 550 C09K 3/14 550C 550Z 3/18 101 3/18 101 (72) Inventor Ryotaro Hidaka 1-4-6 Minamishinmachi, Chuo-ku, Osaka-shi, Osaka Reference) 4D075 BB02X CA36 DA23 DB02 DC12 EA02 EA13 EA37 EB16 EB42 EC02 EC03 EC53 4H020 BA06 BA11 BA12 BA32 4J038 BA202 BA212 CB082 CD092 CD122 DF002 DL031 DL051 DL071 DL081 DL091 DL121 GA01 GA03 GA07 GA07 GA07 GA07

Claims (6)

[Claims] 1. The method of claim 1, wherein the surface of the coating is coated with a surfactant and abrasive particles
A method for treating the surface of an automobile paint, which comprises forming a water-repellent film after polishing the surface with a buffing composition which is a W / O emulsion containing an oil component and water. 2. The method according to claim 1, wherein the water-repellent film is formed by applying a water-repellent film-forming agent containing wax and a silicone compound as main components. 3. The method of claim 2, wherein the water repellent film forming agent further contains a fluorine compound. 4. The method for treating a painted surface of an automobile according to claim 1, wherein the water-repellent film is formed without wiping after the surface is polished. 5. The polishing particles according to claim 1, wherein the abrasive particles are at least one selected from the group consisting of alumina, silica, kaolin, and diatomaceous earth.
Or the method for treating an automobile painted surface according to 4. 6. The abrasive particles have a particle size of 0.1 to 50 μm.
m.
A method for treating an automotive painted surface as described in the above.