JPH0365540A - Manufacturing method of laminated glass - Google Patents

Abstract

PURPOSE:To obtain a laminated glass in higher productivity by putting a plastisol between two glass plates set in a mold followed by compression. CONSTITUTION:Two glass plates 1 are put into a mold 3, and a plastisol comprising (A) 100 pts.wt. of a vinyl chloride resin containing 0.1-20wt.% of epoxy group, (B) 20-80 pts.wt. of a plasticizer (e.g. dioctyl adipate), (C) a thermal stabilizer, (D) a ultraviolet light absorber and (E) an antioxidant is injected into a space between these glass plates followed by compression to fill the plastisol between (1) the glass plates 1 and (2) a gasket-forming cavity space 2 between the peripheral edge of said glass plates and the inner surface of the mold 3, followed by heating to effect solidification, thus accomplishing the sealing of said peripheral edge and forming of a gasket 6 at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing laminated glass having a gasket on the peripheral edge, which is applied, for example, to automobile window glass or architectural window glass.

(Prior art) Attaching rubber or synthetic resin gaskets or moldings (hereinafter collectively referred to as gaskets) to the periphery of vehicle window glass such as automobiles or architectural window glass for the purpose of decoration or sealing. is normally done.

Conventionally, this gasket has been attached to a window glass by fitting or adhering a gasket formed by extrusion molding or the like into the peripheral edge of the window glass.

However, with this method, the linearly formed gasket is bent to match the peripheral shape of the window glass during installation, which can cause wrinkles at the corners or make installation difficult when the window glass has a complex shape. In addition, a gasket material such as a molten rubber or elastomer or a raw material mixture that can form rubber or elastomer is injected into a mold, and a gasket is formed around the periphery of the window glass in the mold, with the help of a large number of workers. A method has been proposed for removing it from the mold. However, this method has a problem in that the gasket material infiltrates the contact surface between the mold and the glass, which tends to cause flaking and the like. For this reason, it is necessary to strongly clamp the mold and the glass, but this clamping has the problem of easily damaging the glass due to the force.

On the other hand, laminated glass uses a plastic film, typically made of plasticized polyvinyl butyral, called an interlayer film.
It has been manufactured by sandwiching the glass between two or more sheets of glass, deaerating the glass, pressurizing it, and heating it.

However, this conventional manufacturing method requires membrane processing such as cleaning and cutting of the membrane, humidity conditioning of the membrane, and the need to place the membrane in a vacuum bag, perform preliminary pressure bonding, and then place it in an autoclave and pressurize and heat it. There were problems with low performance and high production costs. On the other hand, as membranes other than plasticized polyvinyl butyral, plasticized vinyl chloride resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, etc. have been proposed; Crimp,
Processes similar to those for plasticized polyvinyl butyral, such as main crimping, are required, and low productivity and high production costs have not been improved.

(Problems to be Solved by the Invention) An object of the present invention is to solve the low productivity of the conventional method for manufacturing laminated glass using an interlayer film, and to solve the problem of the complicated process of attaching Gaskent to the laminated glass. An object of the present invention is to provide a method for manufacturing laminated glass that makes it possible to omit operations.

(Means for Solving the Problems) Thus, according to the present invention, two glass plates are placed in a mold, plastisol is filled between the glass plates, and the plastisol is filled between the glass plates and heated and solidified. By doing so,
A method for manufacturing laminated glass is provided, which is characterized in that sealing of the peripheral edge of a glass plate and gasket molding are performed at the same time.

The polymer for plastisol used in the present invention is preferably one that has adhesive properties to glass and has the property of gelling without melting under appropriate heating conditions; examples include epoxy group-containing vinyl chloride resin. can give.

In the present invention, the epoxy group-containing vinyl chloride resin is
1) A copolymer of vinyl chloride, a monomer having an epoxy group, and an optional monomer copolymerizable with these,
Typical examples include 2) a vinyl chloride copolymer with an epoxy group added thereto, and 3) a vinyl chloride copolymer dispersed with an epoxy group-containing resin that is compatible with the vinyl chloride copolymer.

The epoxy group content in the epoxy group-containing resin is 0.1 to 2
0% by weight, preferably 0.5-10% by weight.

In 1), examples of monomers having an epoxy group include glycidyl ethers of unsaturated alcohols such as allyl glycidyl ether and methallyl glycidyl ether;
glycidyl methacrylate, glycidyl acrylate,
Glycidyl esters of unsaturated acids such as glycidyl-p-vinylbenzoate, methylglycidyl itacone 1, glycidyl ethyl maleate, glycidyl vinyl sulfonate, glycidyl (meth)allylsulfonate, butadiene monooxide, vinylcyclohexene monooxide, 2 Examples include epoxide olefins such as -methyl-5,6-epoxyhexene. Monomers having an epoxy group and monomers that can be copolymerized with vinyl chloride as necessary include fatty acid vinyls such as vinyl acetate and vinyl propionate, olefins such as ethylene and propylene, vinylidene chloride, Examples include vinylidene halides such as vinylidene fluoride, vinyl ethers such as isobutyl vinyl ether, methyl vinyl ether, and cetyl vinyl ether, and allyl compounds such as allyl chloride and methyl allyl ether.

In order to obtain the vinyl chloride copolymer used in the present invention using these monomers, well-known methods for polymerizing vinyl chloride such as suspension polymerization and emulsion polymerization can be employed. . For example, when used as a plastisol,
For the purpose of maintaining appropriate fluidity of plastisol, emulsion polymerization or ξ-chloro suspension polymerization, which is a preferred method for producing vinyl chloride resin for paste processing, is preferred.

In 2), examples of the method for adding an epoxy group include a method in which the vinyl chloride resin is dehydrochlorinated by heat treatment or contact with an alkali compound, and then epoxidized with an organic peracid or the like.

In 3), the epoxy group-containing resin refers to a copolymer of a monomer having an epoxy group and a monomer copolymerizable therewith.

The plastisol used in the present invention is prepared by mixing resins, plasticizers, heat stabilizers, ultraviolet absorbers, antioxidants, lubricants, fillers, colorants, etc. according to the purpose. and degassed.

A wide variety of plasticizers that are generally called plasticizers for polyvinyl chloride can be used. For example, aliphatic plasticizers include dioctyl adipate, butyl diglycol adipate, dioctyl azelate, dibutyl sepacate, diisodecyl adipate, etc., and phthalate plasticizers include dioctyl phthalate, dibutyl phthalate, diisobutyl phthalate, butyl Examples include benzyl phthalate, dilauryl phthalate, dioctyl phthalate, etc. Phosphoric acid plasticizers include tricylenyl phosphate, tricresyl phosphate, talesyl diphenyl phosphate, trischloroethyl phosphate, trischloroethyl phosphite, tributyl phosphate, etc. can be given. Examples of epoxy derivatives include epoxidized soybean oil and epoxy fatty acid monoester.

Polyester plasticizers can also be used in some cases. The appropriate amount of the plasticizer to be blended is 20 to aOmffi parts per 100 parts by weight of the vinyl chloride resin. If there is too much plasticizer, the film strength will decrease, and if it is too little, it will become hard.

Suitable heat stabilizers include alkylated tin compounds of fatty acids such as butyltin laurate, butyltin maleate, and octyltin maleate, and alkyltin-containing sulfur compounds such as di-normal octyltin bis(isooctylthioglycolic acid ester) salt. used for. It is also possible to use a metal soap type stabilizer together with these.

Benzotriazole-based UV absorbers are excellent, such as 2(2'-hydroxy-5'methylphenyl)benzotriazole, 2(2'hydroxy-3'-tert-butyl-5'-methylphenyl)-5- Chlorobenzotriazole, 2(2'-hydroxy-3',
5'-tertiarybutylphenyl)-5-chlorobenzotriazole, 2(2'-hydroxy-4'-octoxyphenyl)hencytriazole, and the like are preferably used.

Phenolic antioxidants are excellent as antioxidants, such as 2,6-ditertiary-butyl p-cresol, 2,2'-methylenebis(4methyl-6-tertiary-butylphenol), and 4,4'-butylidenebis. (
3-methyl-6-tert-butylphenol), 4
．． Examples include 4'-thiobis(3-methyl-6-tert-butylphenol).

Further, if necessary, a crosslinking agent, a thickener, a diluent, a silane type or titanate type coupling agent, etc. are added.

Since plastisol is in liquid form, dust and foreign matter can be removed using filters, etc., and storage and transportation are handled in closed systems such as tanks and pipelines, making quality control easy and suitable for automation. There is.

Next, two glass plates are placed in a mold, and the plastisol is injected between the two glass plates and compressed.

This compression is an operation performed to prevent the glass from peeling off from the film during the subsequent heating process and to maintain a constant thickness of the film. The plastisol is filled between the glass plates, and is also filled into the space between the peripheral edge of the glass plate and the inner surface of the mold, which are connected to the glass plate, and into the space of the cavity for molding. This cavity space for gas molding may extend over the entire circumference of the glass plate, or may extend partially depending on the circumstances.

Then, the plastisol in the peripheral edge of the glass plate and the gasket molding cavity space is preheated and solidified, and the peripheral edge of the glass plate is sealed and the gasket is preformed.

In this preforming, the resin particles are swollen by the plasticizer due to heating, and the particles loosely melt together on the surface layer and become fixed, and the plastisol no longer has fluidity.
Since the center of the particles is not gelled, the physical strength of the molded product is poor. This heating temperature varies depending on the resin composition, but is selected from the range of 110 to 230°C. The heating time varies depending on the temperature and heating method, but is selected from the range of 1 second to 10 minutes in consideration of productivity and the like.

After the seal and gasket have been preformed in this way, the glass with the gasket is removed after cooling if necessary. The gasketed glass obtained in this way is
By further heating, the remaining plastisol layer other than the peripheral area and the previously gelled peripheral edge/gasket are melted and gelled, and a strong elastic membrane and gasket are incorporated into the laminated glass and molded at the same time.

In this melt gelation, the entire resin particle is gelled to the center, so the physical strength of the molded product is high. The temperature and time of this heating have variable factors similar to those for preforming, but each
The temperature is selected from the range of 230°C and 1 second to 30 minutes. At this time, it is also possible to take measures to prevent excessive heating by covering the preformed portion with metal or the like to delay heating.

Further, instead of employing such a two-step heating process, heating that serves as both steps may be performed in one step. In this case, the heating conditions need to be set at a time shorter than that in the case of the above-mentioned preforming.

Here, heating methods include hot air Wi ring heating, (far)
Heating devices used in normal paste processing, such as infrared heating, dielectric heating, and induction heating, can be used.

Furthermore, since air bubbles are prevented from entering between the glass plates during plastisol filling, a pressurizing and heating device such as an autoclave is not required.

(Effects of the Invention) Thus, according to the present invention, compared to the conventional technology, a series of operations such as cleaning, drying, cutting, and humidity conditioning of the membrane associated with handling the membrane can be omitted, and since it is a liquid substance, it is possible to eliminate the need for a closed system. Since it can be handled easily, there is no need for a large-scale lean room. Furthermore, since the pressure bonding process using an autoclave can be omitted and the glass periphery can be easily sealed in a short time, the series of processes can be carried out in continuous online production, making it possible to manufacture laminated glass with high productivity and at low cost. becomes.

Furthermore, since a gasket can be formed on the periphery of the laminated glass without damaging the laminated glass, it is possible to manufacture laminated glass that does not require manual attachment of the gasket.

(Example) The present invention will be described in more detail with reference to Examples below.

[AF of plastisol]

Consisting of 92% vinyl chloride, 3% glycidyl methacrylate, and 5% ethylene, average particle size 1μ, average degree of polymerization 120
0 parts of epoxy group-containing vinyl chloride resin, 10 parts of dioctyl phthalate, 30 parts of dioctyl adipate,
4 parts of diptyltin polymercaptide and 0.3 parts of 2.2'-methylenebis4-methyl-6-tert-butylphenol are placed in a vacuum type high speed defoaming mixer and mixed and defoamed.

[Manufacture of laminated glass]

FIGS. 1 and 2 show a state in which a glass plate is placed in a mold in an embodiment of the present invention.

As shown in FIG. 1, a glass plate 1 is placed inside a mold 3, and a cavity space 2 defined by the mold 3 and the peripheral edge of the glass plate is formed. This cavity space 2 is formed all around the peripheral edge of the glass plate.

After two glass plates 1 each measuring 3cm x 3Qcm and having a thickness of 3cm were placed in the mold 3, plastisol was injected between the glass plates and the mold was pressed down. The plastisol that filled between the glass plates penetrated into the cavity space and further filled the cavity space.

Note that the plastisol that overflowed from the mold 3 was collected.

Next, 160 c of pressurized steam was passed through space 4 for 5 minutes.
After heating and solidifying the plastisol in the cavity space 2 and the plastisol at the periphery of the glass plate 1, the steam is stopped,
Cooling water was passed through space 4 for 5 minutes to cool it. After cooling, the mold 3 was opened and the laminated glass gasket material was taken out.

This preformed gasket material is made of 140 pieces of laminated glass.
The mixture was heated at ℃ for 30 minutes to obtain a laminated glass gasket material.

[Brief explanation of the drawings] Figure 1 is a partial cross-sectional view showing the glass plate placed on the mold, Figure 2 is a plan view showing the glass placed on the mold, and Figure 3 is the gasket. It is a sectional view of laminated glass. The explanation of the symbols is as follows. l glass plate, 2: cavity space, 3: mold, 4:
Space (for steam, cooling water), 5: Laminated glass, 6: Gas queso 1~

Claims (1)

[Claims] Two glass plates are placed in a mold, and the plastisol is interposed between the glass plates and compressed to form a cavity space for forming a gasket between the peripheral edge of the glass plate and the inner surface of the mold, and the plastisol is placed between the glass plates. A method for producing laminated glass, which is characterized by simultaneously sealing the peripheral edge of a glass plate and forming a gasket by filling the glass and heating and solidifying the glass.