JPH01239041A - Production of laminated glass - Google Patents

Abstract

PURPOSE:To enhance durability of laminated glass, increase mechanical strength thereof and simultaneously contrive mass production at a low cost, by combining different kinds of thermoplastic synthetic resin films respectively containing a specific plasticizer and stabilizer, interposing the resultant composite film between sheets of glass and subjecting the glass and film to thermocompression bonding. CONSTITUTION:Different kinds of thermoplastic synthetic resin films respectively containing triethylene glycol.2.ether butyrate or di-N-hexyl adipate as a plasticizer and tridecyl propionate or benzophenones as a stabilizer are combined to form two or more layers of composite films. The resultant composite films are then interposed between sheets of glass and subjected to thermocompression bonding. For example, polyvinyl butyral, polyurethane, EVA, EVA graft terpolymer, polyamide, polycarbonate and polyethylene terephthalate, are cited as the thermoplastic synthetic resins.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to various applications such as building materials, motor vehicles, etc. in which two or more layers of composite films made of different materials are interposed between glass and bonded under heat. This invention relates to a method for manufacturing laminated glass used for.

[Prior Art] The conventional method for manufacturing this type of laminated glass is to insert a layer of film, such as PVB (polyvinyl phthalate), polyurethane, or other various synthetic resin films, between the glass and the glass, and use a pressure bonding method using an autoclave. Alternatively, they were manufactured by thermocompression bonding. In the pressure bonding method using an autoclave, for example, the pressure is 5 to 10 kg/cm2. Glass is placed in an autoclave at a temperature of 80 to 100°C, and the film is placed between the glasses,
Furthermore, the pressure is 10~l S K g,/cm" and the time is 15
This method takes about 20 minutes to press and bond. In this pressure bonding method using an autoclave, PVB is usually used as an intervening film. In addition, in the method using thermocompression bonding, EVA (ethylene vinyl acetate copolymer) or EVA graft terpolymer is usually used as the intervening film.

[Problem to be solved by the invention] L: In the conventional laminated glass manufacturing method, since the film interposed in the middle is a single layer, not only the mechanical strength is insufficient, but also the adhesion to the glass is still insufficient. There was a problem. In addition, the film itself ages over time, or the film deteriorates due to the influence of ultraviolet rays due to the transmission of sunlight, etc., causing problems in terms of the durability of the laminated glass. In the case of the crimping method using an autoclave, the apparatus is large-scale, the process is troublesome, and the cost is high.

The present invention has been made in view of the above points, and its purpose is to increase the strength of the film itself, prevent aging, and increase adhesion to glass, so that it can be used as laminated glass. It is an object of the present invention to provide a method for manufacturing laminated glass that increases the mechanical strength and that can be mass-produced at low cost using an easy pressure bonding method.

[Child role for solving the problem] The method for producing laminated glass according to the present invention uses triethylene glycol-2-etherbutyric acid or di-N as a plasticizer.
- Hexyl adipate containing l-lysosylpropionate and benzophenones as stabilizers, respectively. The structure is such that the film is interposed between the glasses and bonded under heat.

In the present invention, triethylene glycol 2.
The reason for using etherbutyric acid or di-N-hexyl adipate is to promote the plasticity of the thermoplastic synthetic resin film, increase its adhesion to glass, and prevent aging of the film caused by heat, light, etc. This is for the purpose of preventing this. In addition, we decided to use tridecylpropionate and benzophenones as stabilizers because the thermoplastic synthetic resin film absorbs ultraviolet rays, prevents the film from deteriorating, and improves the durability of the laminated glass. be. When combining different types of thermal ijT plastic synthetic resin films, it is necessary to select compatible resins to ensure good adhesion. By combining different types of resins, the mechanical strength of the film increases due to their mutually complementary effects. Thermoplastic synthetic resins that form the film include PVB, polyurethane, EVA, EVA kraft terpolymer, modified ethylene vinyl acetate copolymer, and PE5.
Resins such as (polyether sulfur ether ether ketone), polyamide, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polybenzoyl, polyacetal, and polyphenyl sulfide are used. As an example of a combination of thermoplastic synthetic resin films, for example, in the case of three layers, different resins are used in A. B. If C is a combination of different types such as A/B/C or a combination of different types such as B/A/B, in the case of four layers, different resins may be used as A. B. C. If D is a combination of all different types such as A/B/C/D, or a combination of two types of resins such as A/B/A/B, or A/B/'A/C, A/
A possible combination such as B/C/A is possible. In any case, it is important to select a resin that has good adhesion for bonding with the glass, and it is also necessary to select a resin that has a coefficient of thermal expansion similar to that of the glass.

To create a film with two or more layers, the film is tri-laminated using hot melt or adhesive. For example, EVA kraft terpolymer film and PVB film are tri-laminated with EVA hot melt adhesive to create a composite film. The thickness of this composite film for building materials is 0.67 mm, of which the standard thickness for EVA film is 0.271 m11. In the case of automobiles, for example, in the case of a three-layer composite film, the thickness of the center film is 0.25 to 0.31 mm, and the thickness of the EVA films on both sides of the center film is 0.625 to 0.3 mm.

The composite film obtained by Kita's method is placed between glasses and set in a high-temperature pressure machine. The conditions at this time are a temperature of 100 to 120℃, a pressure of 10 to 15Kg/c112, and a time of 15 to 20℃.
Heat and press in this state for a minute. In this way, by applying high temperature and high pressure, the composite film becomes soft, increases its plasticity, removes air bubbles between the glass and the composite film, and improves its adhesion to the glass.

After thermocompression bonding for the predetermined time, it is taken out from the high temperature pressure machine and cooled for a predetermined time to obtain the desired laminated glass.

[Effect of the invention] As can be seen from the above explanation, the present invention uses I as an nf plastic agent.
- Two or more layers of thermoplastic synthetic resin films containing lyethylene glycol 2-etherbutyric acid or di-N-hexyl adipate, tridecylpropionone-1 or benzophenones as stabilizers, respectively, are combined. This is a laminated glass manufacturing method in which a composite film is formed, and then the composite film is interposed between glasses and bonded by thermocompression, so the plasticity of the composite film is increased, the adhesion with the glass is improved, and the aging of the composite film is prevented. or planned. Therefore, in combination with the multilayering of the film, the mechanical strength of the laminated glass is increased, and excellent effects can be obtained in that a product conforming to various standards such as JIS, AS, ECE, etc. can be obtained. In addition, since the thermoplastic synthetic resin film contains the above-mentioned specific stabilizer, the film has the unique effect of absorbing ultraviolet rays well, preventing film deterioration, and improving the durability of laminated glass. play. Moreover, since the laminated glass can be manufactured by a convenient thermocompression bonding method, it has the advantage that it can be mass-produced at low cost and that laminated glass with the same bonding strength as the autoclave method can be obtained.

[Example] ■Manufacture of PVB film (Duyang part) PVB resin (manufactured by Chang Chun) 100G N-hexyl adipate 50 (CH3)
4 (COOCsHt:+)2 tridecylpropionate 3 The above mixture was mixed upward in a Banbury mixer, and kneaded by passing it through an Omingrow J. Next, it was passed through a reverse Shisei Calendar roll, and then passed through a clean crawl. And the thickness is 0.2~0.7
A film was produced by adjusting the concentration to 1.

■Manufacture of EVA graft terpolymer film EVA graft terpolymer 100 di-N-hexyl adipate 10 tridecyl propionate 3 benzophenone mark
A film was manufactured in the same manner as the 0.2PVB film, with the thickness adjusted to 0.2 to 0.3 mm.

■Hot-melt type adhesive Ethylene acetate vinyl polymer-100 Di-N-hexyl adipate 5 Tritesyl propionate 2 Bennephenone mark 0. 1" mixture of 70-12
The mixture was heated to 0°C, mixed upwards, and then cooled to form an adhesive.

In addition, instead of using the above-mentioned PVB film and EVA craft terpolymer film, polyurethane film, P
When using a film such as ES or PEEK, a two-component polyurethane adhesive is used as the adhesive.

The components of this two-component adhesive were as follows.

Desmolin N 100Des
100Des 176 40Coronate L 20Ethyl acetate
20 trolls
40MEK
20MIBK 2
0 In the case of this two-component adhesive, coat with the roll coach and ing method and 1 to lye laminate.

After applying the hot-melt adhesive described in (2) above to both sides of the PVB film in (2) above, apply the EVA plant terpolymer film in (2) above to both sides of the PVB film in (1) and laminate one layer using a dry laminating machine. A three-layer composite film was produced. Next, the three-layer composite film was placed between glasses and placed in a high-temperature pressure machine to be bonded by thermocompression. The temperature at this time is 100-120
℃, the pressure is 10~15Kg/cm2, and the time is 15~15Kg/cm2.
It was 20 minutes. After the thermocompression bonding was completed, the glass was cooled and taken out to obtain a desired laminated glass.

The obtained laminated glass had high adhesion between the composite film and the glass, and had excellent mechanical strength and durability for use in automatic products, building materials, etc.

Claims (1)

[Claims] Two or more layers of different thermoplastic synthetic resin films containing triethylene glycol 2-etherbutyric acid or di-N-hexyl adipate as a plasticizer and tridecylpropionate and benzophenones as stabilizers. 1. A method for manufacturing laminated glass, which comprises forming a composite film, and then interposing the composite film between glasses and bonding them by thermocompression.