JPH0334384B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a paint application method, and more specifically, a method for automatically applying a masking paint with a uniform width to the inner peripheral edge of a vehicle window glass as a coating area, The present invention also relates to a paint application method that can prevent paint from drying and solidifying that adheres to the brush at times other than during the application process.

Conventional technology and problems to be solved In recent years, the direct glazing method, in which the window glass is directly attached to the window frame via a sealant, has been adopted on the automobile assembly line, and the gap between the periphery of the window glass and the window frame of the vehicle body is sealed. Therefore, moldings are installed using the flat mount method in an attempt to reduce assembly costs, but moldings tend to become thinner due to the demand for a wider field of view during driving and a larger external appearance of the window glass. Since the sealing material for adhering the window glass is seen through from the outside and impairs the appearance, the periphery of the window glass is masked.

However, this masking is generally done manually using a brush, which requires the skill of the operator to form a masking surface of uniform width, and the work efficiency is low, so automation of the application work is not recommended. It is becoming desired. Even if such automation were to be realized, there is a strong possibility that the paint that adheres to the brush itself during work stoppages would dry and solidify due to the solvent escaping, and this would put a damper on the automation system. It turns out.

The purpose of the present invention is to automatically form a coating film with a uniform width in a simple and quick manner when applying paint with a brush, including the automation of such masking work, and to prevent the drying and solidification of paint that adheres to the brush at times other than during the application process. The purpose of the present invention is to provide a coating method that can be used.

As a result of consideration in view of this purpose, the present inventors found that
Automation is achieved by regulating the widthwise side of the tip of the brush that comes into contact with the application area, and automatically sliding the brush along the application area while supplying a fixed amount of paint.
He discovered that the desired purpose could be achieved by keeping the brush sealed except during application work.
The present invention has now been completed.

Structure and Effects of the Invention That is, the present invention press-fits a paint for brush application from the rear end into a brush means surrounded by leaving a flat rectangular cross-section tip with regulated widthwise sides, and The brush means is automatically moved in sliding contact along the application area while the coating is being leached from the coating area, and a strip-shaped coating film with a uniform width corresponding to the side regulation width of the brush means is formed. To provide a paint application method characterized in that the tip of the brush means is sealed to prevent paint within the brush means from drying and solidifying.

Any paint that is generally applied with a brush can be used as the paint that is the object of the present invention. Among them, as the masking paint, it is preferable to use an organosilane-based organic solvent type cold-curing paint containing carbon black. Since this silane paint has the function as a primer, it is possible to omit the primer treatment that is necessary when using, for example, an inorganic ceramic paint. The above silane-based paints include (a) epoxysilane (γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, 3,4-epoxycyclohexylethyltrimethoxysilane, 3,4-epoxycyclohexylethylmethyl dimethoxysilane, γ-glycidoxypropylmethyldiisopropenoxysilane, etc.) and silanes with functional groups active towards epoxy groups (aminomethyltriethoxysilane,
N-(β-aminoethyl)aminomethyltrimethoxysilane, aminomethylmethyldiethoxysilane, N-(β-aminoethyl)aminomethyltributoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropylmethyldiethoxy Silane, γ-aminopropylmethyldiethoxysilane, γ-aminoisobutyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, N-bis(β-hydroxyethyl)-γ-aminopropyltriethoxysilane, N-(β- N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, N-(β-aminoethyl)-γ-amino-β-methylpropyltrimethoxysilane, etc. ) and the reaction product (the reaction is set at a ratio of 0.3 to 1 mole of silane having a functional group active toward epoxy groups per mole of epoxysilane, and the reaction is carried out in an organic solvent such as methyl ethyl ketone at room temperature for about 20 hours. A mixture of one or more of (b )
Film-forming substances (polyester resin, chlorinated rubber,
Polyvinyl chloride resin, polyacrylate resin, silicone resin, epoxy resin, ethylene vinyl acetate copolymer, etc.), polyisocyanate [trimethylhexamethylene diisocyanate, hesamethylene diisocyanate, isophorone diisocyanate, lysine diisocyanate methyl ester, tolylene diisocyanate, desmodyur N (polyisocyanate manufactured by Bayer), Coronate HL (polyisocyanate manufactured by Nippon Polyurethane), etc.], and silanes having active functional groups in the polyisocyanate and isocyanate groups [aminomethyltriethoxysilane, N-(β-amino ethyl)aminomethyltrimethoxysilane, aminomethylmethyldiethoxysilane, N-(β-
aminoethyl)aminomethyltributoxysilane, γ-aminopropyltriethoxysilane, γ
-aminopropylmethyldiethoxysilane, γ-
Aminoisobutyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, N-bis(β-hydroxyethyl)-γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ
-aminopropyltrimethoxysilane, N-(β
-aminoethyl)-γ-aminopropylmethyldimethoxysilane, N-(β-aminoethyl)-γ-
Amino-β-methylpropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, 3,4-epoxycyclohexylethyltrimethoxysilane, 3,4-epoxycyclohexylethylmethyldimethoxy (c) carbon black or a pigment component containing it [lamp Inorganic pigments such as black, titanium white, red iron oxide, titanium yellow, zinc white, red lead, cobalt blue, iron black, aluminum powder, etc., Neo Pomelo Black RE, Neo Black RE, Orazol Black
CN, Orazol Black Ba (all manufactured by Ciba-Geigy), and Spiron Blue 2BH (manufactured by Hodogaya Chemical Co., Ltd.)], and these are mixed with a suitable organic solvent (ketone such as methyl ethyl ketone or acetone). esters such as ethyl acetate, butyl acetate, ethers such as ethyl ether, tetrahydrofuran, dioxane, toluene, xylene, methylene chloride, etc.), and if necessary, add ultraviolet absorbers and fillers ( glass powder, glass flakes, molecular sieves, powdered silica gel, clay, ultrafine powdered silicic acid, etc.), thickeners, dehydrating agents, plasticizers (butylbenzyl phthalate, dioctyl phthalate, dibutyl phthalate, chlorinated paraffin, etc.), etc. Consists of a blended system. The mixing ratio of the above essential components (a to c) is usually 100 parts (by weight, the same applies hereinafter) of component (a) to 100 to 200 parts of component (b), and the total of components (a) and (b). (c) component 5 to 100 parts
The amount may be selected to be 200 copies, preferably 30 to 100 copies.

Hereinafter, the paint application method according to the present invention will be described in detail with reference to the accompanying drawings.

A paint applicator suitable for carrying out the method of the invention is shown, for example, in FIGS. 1 and 2. In this device, a paint pumping pipe 2 is inserted into the brush means 1 having a flat rectangular tip 1a from its rear end (see Fig. 2), and the pipe 2 is bundled and fixed, while the tip 1a is left in place and the brush is removed. The entire means is surrounded by a box-shaped container 3, and the distal end 1 is surrounded by regulating pieces 3a, 3a protruding from both sides of the container 3.
Regulate the width direction side of a. The above pressure feeding pipe 2
is connected to an automatic paint supply device consisting of a pressure pump 5 and a paint storage tank 6 to supply a fixed amount of paint. Here, a system is adopted in which a pressure pump 5 (fan flow pump, commonly known as a caterpillar pump) is installed between the pressure feed pipe 2 and the paint storage tank 6, but instead of this, air pressure, inert gas, solvent vapor, etc. Accordingly, the system may be such that the paint in the storage tank 6 is supplied by a pressurized pressure tank system. Further, as for the means (not shown) for automatically sliding the brush means 1 along the application site, a conventional system may be adopted, for example, a pipe cover 2 preferably connected to or integrally formed with the container 3. 'or the upper end of the container 3 may be attached to the arm of an automatic control robot that operates in response to command signals. Furthermore,
If necessary, it is preferable to provide a guide means 4 for aligning the widthwise end of the tip end of the brush means 1 along the periphery of the window glass W.

The brush means may be of any type as long as it can be applied by dipping liquid into it and is resistant to solvents, and may be constructed using a member capable of utilizing capillary action, such as a tampon or felt, in addition to an ordinary brush for application. It is preferable that the tip portion 1a protrudes from the opening of the container by about 2 to 10 mm.

It is preferable that the regulating piece 3a is formed by cutting out a chevron-shaped or circular shape on both sides of the box-shaped container 3, with the central part, which is slightly shorter than the tip 1a of the brush means, as the apex.

When paint is pressurized into the brush means 1 from the pressure pipe 2 by the pressure pump 5, it fills the brush means 1 with capillary action and gradually begins to seep out from the tip 1a, as shown in FIG. When the guide means 4 is brought into contact with the peripheral edge of the window glass W, and the tip portion 1a is moved to slide into contact with the inner peripheral edge of the window glass W by the above-mentioned robot system,
Since the side surfaces in the width direction of the tip portion 1a are defined by the regulating pieces, the coating film 7 having a uniform width is automatically formed.

Note that the pumping amount should be adjusted in relation to the coating speed, and is set in consideration of the physical properties of the paint and the structure of the brush means.

In this way, it is possible to form a coating film with a desired uniform width.
The tip 1a of the brush means 1 is sealed from the outside air with a suitable lid (not shown), and solvent vapor is inserted to prevent the paint inside the brush means 1 from drying and solidifying. Preferably, the lid is fixed, and when the coating operation is finished, the tip 1a of the brush means is automatically inserted into the lid under the control of the above-mentioned robot system so as to be sealed from the outside air. .

Next, the present invention will be explained in more detail with reference to Production Examples and Examples.

Production example (manufacture of organosilane-based organic solvent-based room-temperature curing paint containing carbon black) 236 g of a 10% methyl ethyl ketone solution of γ-glycidoxypropyltrimethoxysilane is placed in a reaction vessel.
and 222 g of a 10% methyl ethyl ketone solution of N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane were added and mixed, and the mixture was allowed to stand at 50°C for 20 hours to obtain a solution of the reaction product.

100 parts of the solution of the epoxysilane reaction product, 10 parts of carbon black, and 10 parts of silicone resin are thoroughly stirred and mixed in a closed container to obtain the title paint.

Example The paint prepared in the manufacturing example was pumped using the paint applicator shown in Fig. 1 at a paint feed rate of 0.59 g/min, and a window glass W was coated at a coating speed of 15 m/min as shown in Fig. 3. Width over 3m of inner peripheral edge of
Form a masking surface of 2.0cm and 10μ thick in 15 seconds. The width error is ±0.5mm, the thickness error is about ±3μ,
It can be seen that the masking surface is industrially acceptable. In addition, when the tip of the brush means was sealed from the outside air with a lid and filled with solvent vapor other than during coating work, the paint did not dry and solidify and the brush method became unusable even after one day. I was able to work again.

After drying this masked surface for 1 minute, without applying a primer, a sealant, such as a one-component moisture-curing urethane sealant (trade name Betaseal #551, manufactured by Sunstar Giken Co., Ltd.), is directly applied in a bead shape. After curing for one week and performing a peel test, the sealant failed cohesively and the adhesiveness was good. Separately, the back side of the glass coated with the above paint was irradiated for 5,000 hours using a Sunshine Weather-Ometer, but there were no problems with the paint peeling, cracking, discoloration, blistering, etc., and it showed good weather resistance.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the paint application device used in the present invention, Fig. 2 is a sectional view taken along the line - - in Fig. 1, and Fig. 3 is an explanatory diagram of masking work using the paint application device of Fig. 1. . DESCRIPTION OF SYMBOLS 1...Brush means, 1a...Tip part, 2...Pipe for pressure feeding, 3...Container, 3a...Regulation piece, 4...
guide member.

Claims (1)

[Scope of Claims] 1. A paint for brush application is press-fitted from the rear end into a brush means surrounded by leaving a flat rectangular cross-section tip portion with restricted widthwise sides, and is allowed to ooze out from the tip portion. At the same time, the brush means is automatically moved in sliding contact with the coating area to form a band-shaped coating film with a uniform width corresponding to the width of the side surface of the brush means, and the tip of the brush means is automatically moved along the coating area. A method for applying paint, characterized in that the paint within the brush means is sealed to prevent the paint from drying and solidifying. 2. The paint application method according to item 1, wherein a guide means is provided and the width direction side end of the brush means is slidably moved along the application area.