JP2000325874A - Coating method for protecting painted film of car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating method for protecting a painted film of a car by which a durable coated layer is obtained. SOLUTION: In this coating method, a fist mixed costing material is prepared by mixing a first coating material containing a silicone resin with a second coating material containing a silicone resin and a catalyst by 2:1-4:1 volume ratio. Meanwhile, a second mixed coating material is prepared by mixing a third coating material containing a polyalkylsiloxane with a fourth coating material containing propylene glycol monomethyl ether acetate by 1:2-1:4 volume ratio. Each of the coating materials thus prepared is applied once without any discontinuity on a prescribed coating zone of the car body in one direction using a coating tool and reapplied on the same zone using a recoating tool. The coated zone is polished by plural times in one direction without any discontinuity using a first finishing tool and polished using a second finishing tool until the coated surface has no blurs. The steps mentioned above are carried out on the all coating zones in due order and subsequently the coated zone is dried by leaving as it is or forcibly dried.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method for protecting automotive coatings.

[0002]

2. Description of the Related Art Vehicles, such as passenger cars, are typically shipped with a conversion coating, an undercoat, an intermediate coating, and a topcoat formed on a vehicle body surface (on a steel plate). Sold. A user who has purchased such an automobile usually performs washing and waxing as appropriate in order to protect the paint and maintain a clean appearance. In order to eliminate the need for such waxing or to further improve the appearance, a protective coating is optionally applied to the paint. For example, a sponge buff was attached to a double action polisher and a single action polisher, and a protective coating was formed by rubbing a polymer emulsion until it became transparent. In such a conventional protective coating, the coating layer was often damaged after 3 months, and the gloss was often lost.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coating method for protecting automotive coatings, which can form a durable coating layer.

[0004]

In view of such circumstances, the present inventors have conducted intensive studies and as a result, surprisingly, by applying a specific paint in a specific procedure, a durable coating layer was obtained. Was formed, and the present invention was completed.

That is, the present invention relates to a first mixed paint obtained by mixing (i) a first paint containing a silicone resin and a second paint containing a silicone resin and a catalyst in a volume ratio of 2: 1 to 4: 1. (Ii) Separately, a third paint containing a polyalkylsiloxane and a fourth paint containing propylene glycol monomethyl ether acetate were added in a ratio of 1: 2 to 1:
And mixing at a volume ratio in the range of 4 to obtain a second mixed paint, (ii)
i) using a sponge on which a cotton cloth or a fine cloth is fixed, and applying the first mixed paint once in one direction to a predetermined application zone of an automobile body without a break;
(Iv) Using a sponge fixed to a movable part of a device that performs a reciprocating linear movement and a cotton cloth fixed thereon, and applying the second mixed paint to the zone applied in step (iii) at 5 to 30 cm / sec. (V)
Using an extra-fine cloth, rubbing the zone a plurality of times in one direction, (v
i) Rubbing the zone with an ultrafine cloth until the coating surface is no longer cloudy, performing (vii) steps (i) to (vi) on the sequential application zones, and then (viii) leaving it alone or forcibly drying And a coating method for protecting automotive paint.

[0006] The first paint used in the present invention contains a silicone resin as a coating film forming component. Examples of such a first paint include Fresser D (special product) A liquid (trade name) manufactured by Matsushita Electric Works, Ltd. It includes, as other components, toluene as a solvent, isopropyl alcohol,
Propylene glycol monomethyl ether acetate and dipropylene glycol monomethyl ether are included.

[0007] The second paint used in the present invention contains a silicone resin and a catalyst as film-forming components. The catalyst has a catalytic action for a crosslinking reaction of the coating film forming component. As an example of such a second paint, there may be mentioned Fresser D (special product) B liquid (trade name) manufactured by Matsushita Electric Works, Ltd., which contains methanol and toluene as solvents as other components.

[0008] The third paint used in the present invention contains a polyalkylsiloxane as a coating film-forming component. Examples thereof include Fresser D (special product) D manufactured by Matsushita Electric Works, Ltd.
Liquid (trade name).

The fourth paint used in the present invention contains propylene glycol monomethyl ether acetate, and examples thereof include 1-methoxypropyl-2-acetate and 2-methoxypropyl-1-acetate. For example, the fourth paint can contain 95-99% of the former and 1-5% of the latter. An example of the fourth paint is Fresser D (special product) B manufactured by Matsushita Electric Works, Ltd.
Thinner (trade name).

First, in the step (i), the first paint and the second paint are mixed at a volume ratio in a range of 2: 1 to 4: 1 to form a first paint.
It is a mixed paint. In a preferred embodiment, the volume ratio is 3: 1.
It is. The mixing is performed, for example, by sufficiently stirring in a suitable container. After mixing, the obtained first mixed paint is left to react for 5 to 30 minutes, preferably 10 minutes, and then, usually, within 4 hours, the following step (ii).
Used in i).

In the step (ii), apart from the step (i),
The third paint and the fourth paint are mixed at a volume ratio of 1: 2 to 1: 4 to obtain a third mixed paint. In a preferred embodiment,
The capacity ratio is 1: 3. The mixing is performed, for example, by sufficiently stirring in a suitable container. The obtained second mixed paint is used in step (iv) after mixing, usually within 4 hours.

In the step (iii), the first mixed paint is unidirectionally applied to a predetermined application zone of an automobile body using a sponge on which a cotton cloth or an ultrafine cloth is fixed (hereinafter referred to as an application tool). Apply once without a break. The sponge is made of sponge rubber. The sponge rubber is a foamed rubber, and is formed by blowing a strong air into the uncured latex or adding a foaming agent (for example, sodium bicarbonate) to the rubber which has been strongly masticated to foam. As an example of the cotton cloth, one made of 100% cotton non-woven fabric can be mentioned. Here, the extra-fine cloth is a so-called extra-fine fiber, for example, an extra-fine PET.
A cloth made from fibers. For one-time application, for example, two first mixed paints are applied to the application tool in a length of 3 to 10 cm, preferably about 7 cm. This is applied to a coating zone (usually 0.01 to 0.36).
m ² , preferably about 0.35 m ² ). If it is applied twice, unevenness will occur.

Here, in the present specification, the “coating zone” refers to a range of one coating operation. For example, about 0.35 m ² (about 0.6 mx 0.6 m) is, for example, about 1/4 (about 1/6 for a wagon-type car) at the top of a car and about 1/4 to about 1 at a hood. / 5, about 1/3 vertically for the trunk, about 1/2 vertically for the rear fender, and about 1/2 front and rear for the fender.

In the step (iv), a sponge is fixed to a movable portion of a device which performs a reciprocating linear motion, and a cotton cloth is further fixed thereon (hereinafter, referred to as a recoating tool).
, The second mixed paint is applied at a moving speed of 5 to 30 cm / sec on the zone applied in the step (iii). Here, the sponge is preferably harder. The sponge is attached to the movable part with, for example, a hook-and-loop fastener, and a cotton cloth is wound thereon. When performing recoating, for example, two second mixed paints are applied to the character on the recoating tool in a length of about 7 cm per character.

In the step (v), the application zone is rubbed a plurality of times in one direction using an extra-fine cloth (hereinafter, referred to as a first finishing tool when used in the step (v)). Preferably, 5-
Rub 2-3 times within 10 seconds.

In the step (vi), the application zone is rubbed with a very fine cloth (hereinafter, referred to as a second finishing tool when used in the step (vi)) until the coating surface is free from fogging.

In the step (vii), the above-mentioned (i) to (i)
The step (vi) is sequentially performed on the successive application zones.

Next, an example of the order of the application zones will be described. 1) Top (inside of the ceiling drain) 2) Top molding (outside of the ceiling drain) to rear fender 3) Opposite top molding (outside of the ceiling drain) to rear fender 4) Trunk (wagon type 5) Bonnet 6) Rear door 7) Front door (side mirror) 8) Fender 9) Opposite rear door 10) Opposite front door (side mirror) 11) Opposite fender 12) Rear bumper 13) Front bumper 14) Rear wheel (Left and right) 15) Front wheel (left and right) 16) Rear license plate 17) Front license plate 18) Window washer nozzle 19) Other PP base material

When the coating on all the target coating zones is completed, the coating is left as it is or forcedly dried. In the case of leaving, for example, it is left for 10 to 12 hours or more in a place with indoor ventilation facilities that is not directly exposed to outside air. The forced drying is performed using a heat source such as infrared rays, far infrared rays, and warm air. A flash-off time of 15 minutes or more is applied to the portion where the coating is completed. The forced drying is performed, for example, using an infrared medium-wave dryer at a temperature of 60 ° C to 70 ° C for a period of 15 minutes or more.

The thus formed coating layer for protecting automobile paints has a good appearance and is durable, so that waxing is not required for a long period of time.

[0021]

The present invention will be described in more detail with reference to the following examples. Example 1 A coating according to the present invention was applied to a Toyota Car Model Mark II. This passenger car has a coating such as urethane resin coating. 90 ml of Matsushita Electric Works Co., Ltd. Fresher D (special product) A liquid as the first paint is thoroughly mixed by stirring 30 ml of Matsushita Electric Works Co., Ltd. Fresher D (special product) B solution as the second paint. Thus, a first mixed paint was obtained. Separately, 40 ml of Matsushita Electric Works Fresser D (special product) D liquid as the third paint and 120 ml of Matsushita Electric Works Fresser D (special product) B thinner as the fourth paint are stirred for 0.5 minute. Thus, the mixture was sufficiently mixed to obtain a second mixed paint.
After mixing, the mixture was allowed to stand for 10 minutes, and the first mixed paint, which had passed about 0.17 hours, was applied to the application tool in a length of about 7 cm per character.
The book was attached. Using this application tool, approximately 0.35 m ² of the first application zone “top” was applied once in one direction without a break. Next, two pieces of the second mixed paint were applied to the multi-coating tool with a length of about 7 cm per character. Using the re-coating tool, the re-coating zone was re-applied within 15 seconds from the first application at a moving speed of about 10 cm / sec. Then, it was rubbed three times in one direction without any break within 5 seconds with the first finishing tool.
Then, the coated surface was rubbed with a second finishing tool within 5 seconds until no fogging was observed on the coated surface. Next, the coating process was similarly performed on the next coating zone “top molding”. Thus, as described in paragraph [0018], the application zone “opposite top molding” is changed to “other P
The same coating process was performed on the “P substrate”. After 15 minutes from the completion of coating on the final coating zone, 1 hour at 80 ° C. using an infrared medium-wave dryer manufactured by Cerashine Co., Ltd.
Forced drying was performed for 5 minutes.

A 5 × 5 cm test piece was cut from the hood of the automobile on which the protective coating layer was formed by the above-described process, and the protective coating layer was evaluated using the test piece. Evaluation is based on the Sunshine Weather Accelerated Weathering Test (SW
OM) (JIS K 5400). This is to test weatherability by repeatedly applying ultraviolet irradiation and water spray. The weather resistance was judged by visual change in appearance and contact angle which is an index of the surface condition. Table 1 shows the results.

[0023]

[Table 1]

From Table 1, it can be seen that the coating layer formed by the method of the present invention did not change its appearance until the operation time was 1200 hours (corresponding to the actual exposure time of 3 years). Further, although the contact angle was slightly reduced by 1200 hours, judging from the magnitude of the contact angle, it can be seen that good water repellency was still maintained even at 1200 hours.

[0025]

According to the present invention, there is provided a coating method for protecting automotive coatings, which can provide a durable coating layer. In addition, Fresselar D described in this specification
Even if a coating like the prior art was applied using a system paint, the surface became sticky and could not be rubbed out like a polymer. An excellent protective coating layer can be formed.

Claims (10)

[Claims] (1) A first paint containing a silicone resin and a second paint containing a silicone resin and a catalyst are 2: 1.
(Ii) Separately, a third paint containing polyalkylsiloxane and a fourth paint containing propylene glycol monomethyl ether acetate were mixed in a ratio of 1: 2-1. : 4 to obtain a second mixed paint, and (iii) using a sponge on which a cotton cloth or an ultrafine cloth is fixed to apply the first mixed paint to a predetermined application zone of an automobile body. (Iv) Zone applied in step (iii) using a sponge fixed to the movable part of a device that performs a reciprocating linear motion and a cotton cloth fixed thereon. And (v) rubbing the zone a plurality of times in one direction using a very fine cloth, and (vi) coating the zone with a very fine cloth. (Viii) The steps (i) to (vi) are sequentially performed on the application zone, and then (viii) the sheet is left as it is or subjected to forced drying. Coating method for painting protection. 2. The first paint contains toluene, isopropyl alcohol, propylene glycol monomethyl ether acetate and dipropylene glycol monomethyl ether in addition to the silicone resin, the second paint contains methanol and toluene in addition to the silicone resin and the catalyst, The coating composition comprises only a polyalkylsiloxane, and the fourth coating composition comprises 1-methoxypropyl-2-acetate and 2-methoxypropyl-1-acetate.
The described method. 3. The first paint is Freseller D (special product) A.
A liquid, the second paint is a Fressera D (specialty) B liquid, the third paint is a Fressera D (specialty) D liquid, and the fourth paint is a Fressera D (specialty) B thinner. The method of claim 1. 4. The first paint and the second paint in the step (i).
The method of claim 1 wherein the paints are mixed at a volume ratio of 3: 1 and the third and fourth paints are mixed at a volume ratio of 1: 3 in step (ii). 5. An application zone having an area of 0.01 to 0.36.
^2. The method of claim 1, wherein m2. 6. The first mixed paint is left to react for 5 to 30 minutes after mixing, and used in step (iii) within 4 hours after the reaction.
The method according to claim 1, wherein the second mixed paint is used in step (iv) within 4 hours after mixing. 7. In the step (iv), 5 to 3 overcoats are applied.
The step (iv) is performed at a moving speed of 0 cm / sec.
2. The method of claim 1, wherein the method starts within 5 to 20 seconds after termination. 8. The method according to claim 1, wherein step (v) is performed within 5 to 10 seconds by rubbing 2-3 times. 9. The method according to claim 1, wherein the step (vi) is performed within 5 seconds.
The described method. 10. The method according to claim 1, wherein in step (viii), forced drying is performed at 60 ° C. to 70 ° C. for 5 to 30 minutes.