JP2524909B2 - Method for manufacturing window glass with gasket - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for easily forming a window glass with a gasket applied to a window glass for an automobile or a window glass for a building.

[0002]

2. Description of the Related Art A gasket made of synthetic resin or rubber is usually attached to the periphery of window glass for automobiles for the purpose of sealing and decoration. Conventionally, a method of fitting or adhering a preformed gasket to the periphery of the window glass has been adopted for attaching the gasket to the window glass. In these methods, since the gasket is attached while being bent around the curved glass peripheral edge, there is a problem in that the attachment is difficult and wrinkles tend to deteriorate the appearance. Further, there is a problem that it requires manpower.

In order to solve this problem, in recent years, a window glass is placed in a molding die having a space at its peripheral portion, and a gasket material such as synthetic resin or rubber is injected into the space portion in a molten state. There has been proposed a method for producing a window glass with a gasket, which is taken out from a mold after being cooled and is integrated with a gasket material at a peripheral portion of the glass.

However, in this method, since the synthetic resin or rubber is injected in a melted and highly viscous state, there is a problem that the gasket material easily penetrates into the contact surface between the glass and the mold to cause burrs and the like. . In order to avoid this, if the mold is strongly tightened to eliminate the gap, there is a problem that the glass is broken. Especially when the window glass is bent, it is difficult to make the degree of curvature of the glass uniform. Therefore, when the mold is tightened,
There are places where stress is applied intensively, which often leads to breakage.

Further, when a synthetic resin or rubber is used as a gasket material, it is injected into a mold after being melted in an injection molding machine to impart fluidity, but since it has a high viscosity in a molten state, it is injected at a high pressure. Requires that. Therefore, the melt enters the gap between the glass and the mold,
It becomes extremely difficult to prevent the formation of burrs.

In order to solve the above problems, it has been proposed to use plastisol as a gasket molding material (JP-A-1-122722). In this method, a window glass is placed in a molding die, a cavity space for gasket molding is formed between the peripheral portion of the window glass and the inner surface of the molding die, and plastisol as a gasket forming material is injected into the space. This is a method of solidifying by heating.

According to this method, since it is possible to inject at a low pressure, it is not necessary to tighten the glass so strongly that burr can be prevented from occurring. However, even in this method, since the viscosity of the plastisol is low, it is conceivable that the sol may infiltrate into the gap and cause burrs if the mold and glass are not fastened tightly. Also, since plastisol is injected at a low pressure into a closed mold, unless the air escape area is devised considerably, it will be molded with air bubbles entrapped,
There is a concern that the appearance may be impaired and that problems may occur with the strength of the product.

[0008]

DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted intensive studies to solve these drawbacks, and as a result, a gun cap having an arbitrary cross-sectional shape and using a specific gasket molding material was formed on the peripheral edge of the glass. It was found that a gasket can be formed under normal pressure without using a mold and a high-pressure injection device by adhering to the glass peripheral edge while continuously moving along the same to discharge the gasket material continuously. ,
The present invention has been completed.

[0009]

According to the present invention, a vinyl chloride resin and a plasticizer are used, and the viscosity at room temperature is 500,000 cps or more at a shear rate of 1 sec ^-1.
Viscosity below 1,000,000 cps and shear rate 100s
A plastigel having a viscosity of 500,000 cps or less at ec ^-1 is supplied to the discharge mouthpiece by a pump, and the plastigel having a predetermined shape that moves along the peripheral edge of the glass plate at substantially the same speed as the discharge speed is used. A method for producing a window glass with a gasket is provided, in which a plastigel having a cross section of the predetermined shape is directly attached to a peripheral portion of a glass plate while being discharged, and then heated and melted.

The plastigel referred to in the present invention will be described. The plastigel used in the present invention is a dispersion containing polyvinyl chloride and a plasticizer as essential components, and is usually a high viscosity composition that does not flow-deform under its own weight. Polyvinyl chloride is a vinyl chloride homopolymer or a copolymer with other monomers, and is a fine particle polymer having a primary particle size of 0.1 to 5 μm obtained by emulsion polymerization or fine suspension polymerization. Any of those used for plastisol or plastigel processing can be used. A vinyl chloride resin having a large particle size obtained by suspension polymerization may be mixed with this as an optional component.

Plasticizers include DOP, DHP, DINP, D
Phthalic acid ester such as IDP, fatty acid ester such as DOA and DOS, polyester such as condensate of adipic acid and polyethylene glycol, acrylic acid ester, methacrylic acid ester, phosphoric acid ester such as TCP may be used alone or in combination. Used. In addition, compounding agents usually used for processing polyvinyl chloride, such as diluents, stabilizers, pigments, ultraviolet absorbers and fillers, can be optionally used.

Examples of the method for increasing the viscosity include fine particle inorganic substances such as silicic acid anhydride and calcium carbonate, organic / inorganic composite thixotropic agents, organic thixotropic agents, and the like, and a necessary amount of the polyvinyl chloride and plasticizer composition Used in addition to.

Another method for increasing the viscosity is to add a plasticizer to
There is a method of dissolving a polymer such as rubber or resin. Polyvinyl chloride, NBR, EVA as preferred dissolving polymers
And the like. In addition, it may be soluble in a plasticizer and may have a high viscosity. As another method for increasing the viscosity, a dispersion of polyvinyl chloride and a plasticizer may be heat-treated to absorb and swell the plasticizer into the polyvinyl chloride resin in an appropriate amount. If the dispersion of polyvinyl chloride and the plasticizer is heated too much, it will gel, so it is necessary to heat it appropriately.

Although any of the above methods may be used, the viscosity of plastigel is 50 at a shear rate of 1 sec ^-1 .
It must be 10,000 cps or higher. If it is less than 500,000 cps, the discharged plastigel may flow and flow out. On the other hand, if it is more than 5 million cps, the fluidity is poor and ejection is difficult.

The plastigel used in the present invention must have a viscosity of 500,000 cps or less at a shear rate of 100 sec ^-1 . If it is higher than this, the supply pipe resistance is large, and the supply pressure must be increased, which is not only the object of the present invention, which makes easy molding impossible,
The dischargeability is poor and it becomes impossible to discharge in an arbitrary shape.

Next, a method for adhering the plastigel of the present invention to the peripheral portion of the glass will be described. FIG. 1 shows a state in which the plastigel is attached to the peripheral edge of the glass while being ejected from the ejection gun. Reference numeral 1 is glass, 2 is a discharged plastigel, 3 is a gun discharge mouthpiece, and 4 is a plastigel supply hose.

That is, the plastigel is supplied from the tank storing the plastigel to the discharge mouthpiece by the pump, and the plastigel is sequentially deposited while being discharged from the mouthpiece having a predetermined shape along the peripheral edge of the glass. It is a thing. By making the discharge speed and the moving speed of the die almost the same, the same shape as the die can be formed.

Further, by changing the moving speed of the die, the amount of the plastigel deposited can be arbitrarily changed, so that the cross-sectional shape can be changed.

When the plastigel of the present invention is used, it is not necessary to increase the supply pressure so much, and the plastigel discharged maintains the cross-sectional shape of the die and is not deformed by its own weight. Can be formed. The plastigel supply device is not particularly limited, but preferably has a structure capable of discharging plastigel from the mouthpiece at a constant speed, and examples thereof include a snake pump, a gear pump, and an extrusion screw pump.

It is possible to partially adhere to the peripheral portion of the glass or only part thereof. When forming on the entire peripheral edge of the glass, the discharge start portion and the discharge end portion are discontinuous, but since the plastigel can easily give a shape, it is easy to correct it to a continuous shape with a spatula or the like.

After adhering the plastigel to the periphery,
The plastigel melts by heating and develops strength by cooling to room temperature. The heating can be performed by any method used for melting the plastisol, such as hot air, high frequency dielectric heating, or high frequency induction heating, but it is necessary to provide sufficient heat for melting. FIG. 2 shows the formed window glass with a gasket.

Further, the plastigel used in the present invention preferably has adhesiveness to glass. To give adhesiveness to plastigel, polyvinyl chloride resin
It may be a copolymer of vinyl chloride and another functional group-containing monomer. Examples of functional group-containing monomers include hydroxyl group-containing monomers such as 2-hydroxypropyl methacrylate, epoxy group-containing monomers such as glycidyl methacrylate, carboxyl group-containing monomers such as maleic anhydride, and amino group-containing monomers such as dimethylaminoethyl methacrylate. Is mentioned. Adhesiveness to glass can be imparted by mixing these copolymers alone or with ordinary polyvinyl chloride. A cross-linking agent depending on the type of the functional group may be used together to increase the adhesive strength. Another method of imparting adhesiveness is applying a primer to the surface of glass. Adhesiveness can be imparted by previously applying an adhesive primer to the portion to which the gasket is attached.

As another method of imparting adhesiveness, a method of adding an adhesiveness-imparting agent to plastigel can be mentioned.
Examples of the adhesion-imparting agent include polyethyleneimine, polyamide resin, and epoxy resin.

The adhesiveness is considered to be exhibited by the reaction between the hydroxyl group on the glass surface and the functional group or hydrogen bonding.
The adhesive strength is determined by a 90 ° peel test. The adhesive strength is preferably 0.1 kg / cm (pulling speed 200 mm / min) or more, and particularly preferably 1 kg / cm or more.

[0025]

As described above, according to the present invention, a window glass with a gasket can be easily manufactured under a normal pressure without using an expensive mold and a high-pressure injection device with a simple shape of a discharge mouthpiece. Further, not only can the glass be prevented from being broken, but a gasket can be easily added to a large glass.

[0026]

EXAMPLES The present invention will be described in more detail with reference to the following examples. The parts and% in the examples and comparative examples are based on weight unless otherwise specified.

Example 1 FIG. 1 shows a device for ejecting plastigel directly to the peripheral edge of the glass according to the present invention, and a state in which the plastigel is attached to the peripheral edge of the glass while ejecting the plastigel from a gun mouthpiece having a predetermined shape. FIG. 1 is glass, 2 is ejected plastigel, 3 is gun ejection cap,
4 shows a plastigel supply hose. Zeon 121 (Nippon Zeon Co., Ltd. vinyl chloride resin) 100 parts, diisononyl phthalate 50 parts, Shiroishi CCR (Shiraishi Industry Co., Ltd.)
70 parts of finely granulated calcium carbonate, 3 parts of a Ba—Zn heat stabilizer, 3 parts of carbon black and 10 parts of silicic acid anhydride were mixed with a Hobart mixer and defoamed to prepare a plastigel. The viscosity of this plastigel composition has a shear rate of 1 sec ^-1.
Was 2.5 million cps and the shear rate was 100 sec ^-1 and was 150,000 cps. This plastigel is put in a tank, pressurized by a snake pump, and discharged from a hose 4 having an inner diameter of 10 mmφ at 100 cm ³ / min from a gun discharge mouthpiece 3, 30 cm ×
A gel having a maximum thickness of 10 mm in the vertical direction of the glass surface and a width of 12 mm in the horizontal direction was attached while moving to the peripheral portion of a glass having a thickness of 50 cm × 5 nm, and heated in a hot air oven at 190 ° C. for 15 minutes. Then, it was cooled to near room temperature. The plastigel was smoothly discharged from the discharge mouthpiece, the cross-sectional shape maintained a predetermined shape, and the shape did not change even after heating, and it was possible to obtain a window glass with a gasket with satisfactory appearance and strength. .

Example 2 A similar test was conducted by using the following composition instead of the compounded composition of Example 1, and the discharge of the plastigel from the discharge nozzle was smooth and the cross-sectional shape was a predetermined shape. Was maintained, and the shape did not change after heating. In addition, a gasket having a strong adhesion to the glass and not easily peeled was obtained. Formulation Example 2 Zeon 121 100 Diisononyl phthalate 50 White luster CCR 70 Ba-Zn heat stabilizer 3 Carbon black 3 Silica anhydride 20 Polyethyleneimine 5 Shear rate 1 sec ^-1 hour 2.8 million cps, 100 sec ^-1 hour 18
10,000 cps

Example 3 Instead of ZEON 121 of Example 1, 97% vinyl chloride,
Average particle size 1 consisting of 3% glycidyl methacrylate
The same operation as in Example 1 was carried out except that an epoxy group-containing vinyl chloride resin having a μ and an average degree of polymerization of 1200 was used to obtain a glass with a gasket having no problem in appearance. The viscosity of this plastigel composition was 2.7 million cps at a shear rate of 1 sec ^-1 , and 180,000 cps at a shear rate of 100 sec ^-1 .

Comparative Example 1 The composition of Example 1 was used, except for the white luster CCR, the shear rate was 1
sec ^-1 is 75,000 cps, 100 sec ^-1 is 20,000 cps
When a plastigel showing the characteristics of s 2 was obtained and the same operation as in Example 1 was carried out, the plastigel was smoothly discharged from the discharge mouthpiece, but the desired shape could not be maintained and it immediately flowed out.

COMPARATIVE EXAMPLE 2 With the composition of Example 1, the amount of white luster CCR was increased from 70 parts to 100 parts, and the shear rate was 1 sec ^-1 to 6 million cps, 100.
When the same operation as in Example 1 was performed using a plastigel exhibiting a characteristic of 300,000 cps at sec ^-1 , the dischargeability was poor and some air bubbles remained.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a method for producing a window glass with a gasket of the present invention.

FIG. 2 is a view showing a window glass with a gasket manufactured by this method.

[Explanation of symbols]

 1 Glass 2 Discharged Plastigel 3 Gun Discharge Port 4 Plastigel Supply Hose 5 Pump or Pressurizer 6 Plastigel Tank 7 Gasket

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B29L 31:26 B29L 31:26 (56) Reference JP-A-2-103278 (JP, A) Kaihei 1-122722 (JP, A) JP 63-175057 (JP, A) JP 62-236848 (JP, A) JP 2-251592 (JP, A)

Claims (1)

(57) [Claims] 1. A vinyl chloride resin and a plasticizer, which have a viscosity at room temperature of 500,000 cps at a shear rate of 1 sec ^-1.
As described above, a plastigel having a viscosity of 5,000,000 cps or less and a viscosity of 500,000 cps or less at a shear rate of 100 sec ^-1 was supplied to the discharge mouthpiece by a pump, and was applied along the peripheral edge of the glass plate at almost the same speed as the discharge rate. Of a window glass with a gasket, characterized in that the plastigel having a cross section of the predetermined shape is directly attached to the peripheral edge of the glass plate while the plastigel is ejected from the ejection mouthpiece having a predetermined shape to be moved and heated and melted. Production method.