JPS6050505B2 - Perimeter masking method and masking device for vehicle windshields - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION L゛Low 1 Tashan I, ノL゛↓゛=F Small Circle This invention relates to a fluorocarbon method and a masking device.

In recent years, the direct glazing method, in which the windshield is directly attached to the window frame via a sealant, has been adopted on the automobile assembly line, and the molding method using the flat mount method has been adopted to seal the gap between the periphery of the windshield and the vehicle window frame. However, due to the demand for a wider field of view during driving and a larger appearance of the window glass, there is a tendency for the windshield to become thinner and thinner. The above sealing material is visible from the outside,
The periphery of the window glass is now masked to avoid disturbing the appearance.

However, this masking method generally requires applying an opaque inorganic ceramic paint to the inner periphery of the glass in a uniform width using a so-called screen printing method, and baking and hardening it at a high temperature of 700°C or higher, which is close to the glass melting temperature. Therefore, the current situation is that glass manufacturers simultaneously perform the curve forming process of the window glass, which increases manufacturing costs. Further, when attaching the window glass to the vehicle window frame, a primer is applied in the form of a film on the masking surface, but the application process is extremely time-consuming. 7. Therefore, in view of the current situation, the present inventors have conducted various studies and found that an organosilane-based organic solvent-based room-temperature curing coating film containing carbon black has a masking effect equivalent to that of the above-mentioned ceramic paint, and also has a function as a primer. Focusing on this, the present invention was completed by adopting a special method and device for the application. An object of the present invention is to provide a method that can easily and quickly form a masking surface on the peripheral edge of a window glass.

In order to form a masking surface with a uniform width around the periphery of the window glass, an inorganic ceramic paint can be applied and baked to harden using the so-called screen printing method, but such a method cannot be used on an assembly line, so an alternative method is needed. It is necessary to provide

Generally, paint is applied using a brush, a roller brush, or by a spray method, but with such methods, it is difficult to apply the paint in a uniform width as with screen printing.
Therefore, another object of the present invention is to provide an apparatus suitable for masking the periphery of a window glass to a uniform width. In the masking method of the present invention, an organosilane-based organic solvent type room temperature curing coating containing carbon black is used. The paint comprises (a) one or more reaction products of an epoxy silane and a silane having a functional group active toward epoxy groups, (b) a film-forming substance, a polyisocyanate, and a polyisocyanate and an isocyanate. (c) one or more substances selected from the group consisting of reaction products with silanes having active functional groups;
It consists of carbon black and is dissolved or dispersed in a suitable organic solvent. It is prepared separately. The epoxysilane used is γ-glycidoxypropyltrimethoxysilane,
γ-glycidoxypropylmethyldimethoxysilane, 3
●4-Epoxycyclohexylethyltrimethoxysila. silane, 3●4-epoxycyclohexylethylmethyldimethoxysilane, γ-glycidoxypropylmethyldiisopropenoxysilane, etc., and one or more of these may be blended.

Silanes having a functional group active toward epoxy groups include aminomethyltriethoxysilane, N-(β-aminoethyl)aminomethyltrimethoxysilane, aminomethylmethyldiethoxysilane, and N-(β-aminoethylsilane). ethyl)aminomethyltributoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropylmethyldiethoxysilane, γ-aminoisobutyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, N
-bis(β-hydroxyethyl)-γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-
Examples include aminopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, N-(β-a)minoethyl)-γ-amino-β-methylpropyltrimethoxysilane, and the like.
Mix seeds or two or more types. These silanes are
Normally, a mixture of silanes having a functional group active against epoxy groups may be blended at a ratio of 0.3 to 1 mole per mole of epoxysilane, but preferably , the two are reacted in advance, and one or more of the reaction products are blended.

This reaction can be carried out in an organic solvent such as methyl ethyl ketone by leaving it at room temperature for about 2 hours. , water, phenol, resorcinol, and other catalysts may also be used. Film-forming substances include polyester resins, chlorinated rubber, polyvinyl chloride resins, polyacrylate resins, silicone resins, epoxy resins, ethylene-vinyl acetate copolymers, and usually one or more of these. 1 to 1 part is added to w parts (weight parts, the same applies hereinafter) of the epoxy silane mixture or reaction product.

Examples of the polyisocyanate include trimethylhexamethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, lysine diisocyanate methyl ester, tolylene diisocyanate, Desmodyur N (Pol-r socyanate manufactured by Bayer AG),
Examples include Coronate HL (polyisocyanate manufactured by Nippon Polyurethane Co., Ltd.), and one or more of them are usually blended in an amount of 1 to 2 (2) per 1 part of the epoxy silane mixture or reaction product.

Preferably, the number is 5 to 1. Examples of the silane having an active functional group in the isocyanate group include aminomethyltriethoxysilane, N-(β-aminoethyl)aminomethyltrimethoxysilane, aminomethylmethyldiethoxysilane, and N-(β-aminoethyl)aminomethyl. Tributoxysilane, 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-
Glycidoxypropylmethyldimethoxylolan, 3●4
- epoxycyclohexylethyltrimethoxysilane,
Examples include 3,4-epoxycyclohexylethylmethyldimethoxysilane, γ-glycidoxypropylmethyldiisopropenoxysilane, etc., which can be reacted with the polyisocyanate to form one or more of the reaction products. Usually, 1 to 2 (2) parts of the epoxy silane mixture or reaction product are mixed.

Pigment components include inorganic pigments such as carbon black, lamp black, titanium white, red iron, titanium yellow, zinc white, lead red, cobalt blue, iron black, aluminum powder, etc. Examples include organic dyes and pigments such as Sol Black Ba (both manufactured by Ciba Geigy) and Spiron Blue 2BH (manufactured by Hodogaya Chemical Co., Ltd.), but carbon black is particularly preferred for the purpose of the present invention, and carbon black is particularly preferred for the purposes of the present invention. 0.5 to 2 for w part of ingredients not included? Blend. Preferably, the amount is 3 to m parts. Examples of organic solvents used include ketones such as methyl ethyl ketone and acetone, esters such as ethyl acetate and butyl acetate, ethers such as ethyl ether, tetrahydrofuran, and dioxane, toluene, xylene, and methylene chloride. One or more of them per epoxy silane mixture or reaction product,
Mix 5 to 500 parts. Other UV absorbers, fillers such as glass powder, glass flakes, molecular sieves, powdered silica gel, clay, ultrafine silicic acid, thickeners, dehydrating agents, butylbenzyl phthalate, dioctyl phthalate, dibutyl phthalate A plasticizer, such as chlorinated paraffin, which imparts flexibility to the primer film and improves adhesive strength, may be included. In order to apply such an organosilane-based organic solvent-based room-temperature curing paint containing carbon black to the peripheral edge of a window glass in the form of a band of uniform width, it is preferable to use a masking device as shown in FIG.

In this device, a paint pumping vibrator 2 is inserted into a brush means 1 having a flat rectangular tip 1a from its rear end and is bound and fixed, while the entire brush means is provided with a container 3, leaving only the tip 1a. The container 3 is sealed with regulating pieces 3a, 3a protruding from both sides of the container 3 to regulate the widthwise side surfaces of the tip.

Reference numeral 4 denotes a guide means for aligning the widthwise side 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.

Its tip 1a is 2~1D from the container opening! It is preferable to make it protrude by about Wt. It is preferable that the tip portion 1a is sealed from the outside air with a suitable lid except during the coating operation, so that the paint inside the brush means does not dry and harden. 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, with the central part, which is slightly shorter than the tip 1a of the brush means, as the apex.

The pressure-feeding vibrator 2 is connected to a paint storage tank 6 via a pressure-feeding pump 5.
connected to. A fan flow pump (commonly known as a caterpillar pump) is used as the pressure pump, but instead of the pressure pump, the automatic paint supply system can be constructed using a pressurized pressure tank system that pressurizes the gate paint in the tank 6 using air pressure, etc. I can bring it. When paint is pressurized into the brush means 1 from the pressure feed vibrator 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 slid on the inner peripheral edge of the window glass W, the width direction side surface of the tip portion 1a is regulated by the regulating piece. , a coating surface 7 of uniform width is formed.

This application may be carried out manually, but preferably an automatically guided system is used.

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.

Due to the nature of the paint, the above coated surface not only has the same effect as masking with conventional inorganic ceramic paint, but also has the same effect as applying a primer, so it can be sealed using the direct glazing method without applying a new primer. The window glass can be attached directly to the window frame using the material.

In addition, unlike inorganic ceramic paints, there is no need for the complicated work of applying and baking them using screen printing, and the masking surface can be formed quickly and easily on the vehicle manufacturing assembly line, reducing the price of the window glass and the cost of installation work. width is reduced. Hereinafter, the present invention will be explained in more detail based on Examples. Production example (manufacture of organosilane-based organic solvent-based room temperature curing paint containing carbon black)
A 10% solution of γ-glycidoxypropyltrimethoxysilane in methyl ethyl ketone 236y and N-
A solution 222y of 10% methyl ethyl ketone of β-(aminoethyl)-γ-aminopropyltrimethoxysilane is added and mixed, and the mixture is allowed to stand at 50°C for 2 hours to obtain a solution of the reaction product.

A solution of the epoxysilane reaction product 10(2) (parts by weight, same hereinafter), 10 parts of carbon black, and w parts of a silicone resin are sufficiently stirred and mixed in a closed container to obtain the title coating material.

EXAMPLES Using the masking device shown in FIG. 1, the paint prepared in the manufacturing example was applied to a window glass W at a coating speed of 15 l/min while the paint was pumped at a paint feed rate of 0.59 f/min as shown in FIG.
Width 2.0cm 1 Thickness 1 over the inner peripheral edge 3TrL of
A masking surface with a thickness of 0 μm is formed using a vacuum cleaner.

Width error ±0.5T! It can be seen that the Rlnl thickness error is about ±3μ, which is an industrially acceptable masking surface. After drying this masking surface for 1 minute, a sealant such as a one-component moisture-curing urethane sealant (trade name Petaseal #551, manufactured by Sunstar Chemical Co., Ltd.) is directly applied in a bead shape without applying a primer. After curing for one week, a peel test was performed, but the sealant failed cohesively and the adhesiveness was good.

Separately, the back side of the glass coated with the above paint was irradiated with a Sunshine Weather-Ometer for 500 seconds, but there were no problems with the paint peeling, cracking, discoloration, or blistering, indicating good weather resistance. .

[Brief explanation of drawings]

FIG. 1 is a perspective view of a masking device according to the present invention, and FIG.
The figure is a sectional view taken along the line ■--■ in FIG. 1, and FIG. 3 is an explanatory diagram of a masking operation using the masking device shown in FIG. 1. 1... Brush means, 1a... Tip part, 2...
・・・・・・Vibrator for pressure feeding, 3・・・・・・Airtight container, 3
a... Regulation piece, 4... Guide member.

Claims (1)

[Scope of Claims] 1. In order to form a masking surface of uniform width on the inner peripheral edge of a vehicle window glass, an organosilane-based organic solvent-based cold-curing paint containing carbon black is applied to a tip portion whose widthwise side surface is regulated. Pressing the brush into a sealed brush means from the rear end and allowing the brush to seep out from the tip, while sliding the brush means along the inner periphery of the window glass;
A method for masking the periphery of a vehicle window glass, the method comprising forming a band-shaped coated surface having a uniform width corresponding to the side surface regulation width of the brush means. 2. Insert and fix the tip of the paint pressure pipe into the brush means from its rear end, and enclose and seal the entire brush means with a container, leaving only the tip, and close the tip with a regulating piece protruding from the side of the container. Regulating the width direction side of the section,
A masking device characterized in that the paint can be press-fitted into the hair removal means through the pressure-feeding pipe. 3. The method according to item 2, further comprising guide means for aligning the widthwise side end of the tip of the brush means along the periphery of the window glass. 4. The device according to item 2, comprising a lid for sealing the tip of the brush means.