JP2006103975A - Method for preventing whitening of laminated glass - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide laminated glass hardly generating whitening. <P>SOLUTION: The method for preventing whitening of laminated glass is characterized in that a sealing material is applied or adhered to the end of the laminated glass in thickness of 1-5 mm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fore edge processing method for preventing whitening after the production of laminated glass.

  In the laminated glass, a resin layer of an intermediate film existing between two sheets of glass exists as an adhesive layer of two sheets of glass, and has good transparency, weather resistance and adhesion, and good penetration resistance. It has the basic performance required for laminated glass, such as glass fragments are less likely to scatter, and is widely used, for example, in window glass for automobiles and buildings.

Laminated glass is classified into two types, film laminated glass and resin laminated glass, depending on the production method.
Film-laminated glass is a glass in which a thermoplastic resin film is sandwiched between two sheets of glass and bonded by heating and pressing. Resin-injected laminated glass is made by injecting a liquid resin raw material between two sheets of glass. Glass that has been reaction hardened and bonded.

  It is known that laminated glass is whitened when water vapor diffuses inside an intermediate film between two sheets of glass, causing irregular reflection of light and lowering transparency. In other words, the laminated glass is usually used in a form in which the four sides are enclosed inside the sash, and water does not penetrate into the sash while the sealing material around the glass is healthy, and the glass edge is wet. Although it is almost never in a state, when the sealing material is in a deteriorated state, water penetrates into the sash, the water is heated by direct sunlight, becomes water vapor, and the glass edge is exposed to a high humidity state. And water vapor diffuse into the glass, causing whitening.

  On the other hand, in the case of film laminated glass, a technique for preventing whitening by improving the components of the intermediate film has been reported (see Patent Document 1). However, it is difficult to prevent water vapor from penetrating the interface between the interlayer film and the glass when the adhesive interface originally faces the outside in a case where the wet interface is extremely wet.

On the other hand, in the case of resin-injected laminated glass, two glasses are fixed to each other by a tape-like end sealing material that adheres or adheres to the four sides except for the injection port in order to inject the liquid resin for casting. Laminated glass is obtained by curing the resin injected into. As this end sealing material, butyl tape, polyacrylate pressure-sensitive adhesive tape, and the like are used, and among them, polyacrylate is frequently used because it can ensure transparency.
However, it is known that in resin-injected laminated glass, water vapor permeates through the interface between the end sealing material and the glass, and a whitening phenomenon occurs. Measures to prevent it are necessary.
That is, when the laminated glass is placed in a high humidity atmosphere, the intermediate film is in direct contact with the ambient air at the periphery of the laminated glass, causing a problem that the peripheral intermediate film is whitened.
JP-A-10-273345

  An object of the present invention is to solve the above problems. That is, an object of the present invention is to provide a method for preventing whitening of the laminated glass.

In such a situation, as a result of intensive studies, the present inventors can easily prevent whitening of the laminated glass if a sealing material is applied or adhered to the edge of the laminated glass at a thickness of 1 mm to 5 mm. The present invention has been completed.
That is, the present invention provides the following method.

<1> A method for preventing whitening of laminated glass, wherein a sealing material is applied or adhered to the edge of the laminated glass with a thickness of 1 mm to 5 mm.

<2> The whitening prevention method according to <1>, wherein the sealing material is a sealing material used around the glass.

<3> The whitening prevention method according to <1>, wherein the sealing material is a combination of a butyl tape and a sealing material used around the glass, or a combination of hot melt butyl and a sealing material used around the glass.

<4> The whitening prevention method according to <2> or <3>, wherein the sealing material is a two-component silicone sealing material or a polyisobutylene sealing material.

  According to the present invention, since the processing is performed on the edge portion of the glass, the basic performance required for the laminated glass such as transparency, weather resistance, adhesion, penetration resistance, etc. is not impaired, and the atmosphere is high in humidity. Even when placed inside, it is possible to provide a laminated glass in which the penetration of water vapor from the peripheral portion of the laminated glass is small and the occurrence of whitening is small.

The present invention is a method for preventing whitening of a laminated glass, characterized in that a sealing material is applied or adhered to the edge of the laminated glass with a thickness of 1 mm to 5 mm.
Details will be described below.

(Sealing material)
Examples of the sealing material used in the present invention include a sealing material used around glass.
Examples of the sealing material resin used here include polysulfide, modified polysulfide, polyisobutylene, silicone, polyurethane, epoxy, acrylic, UV curable polyester, acrylic urethane, styrene / butadiene copolymer, polypropylene, and butyl rubber, and particularly silicone. Polyisobutylene is preferred.
The above resins may be used alone or in combination of two or more. A preferred combination includes a combination of hot melt butyl and the above sealing material.
The sealing material may be a tape. Examples include acrylic tape, butyl tape, and aluminum tape.

(Laminated glass)
The inorganic glass plate used in the laminated glass of the present invention is not particularly limited, and soda lime glass (for example, product name: AS manufactured by Asahi Glass Co., Ltd.) used for general construction (for windows) can be used. In addition, inorganic glass plates having various compositions can be used depending on the application. Moreover, not only normal plate glass but tempered glass, such as tempered glass, double tempered glass, and semi-tempered glass, can also be used.
As the interlayer film used in the laminated glass of the present invention, an EVA resin sheet, a polyurethane resin sheet, a polyvinyl butyral resin sheet, or the like can be used. In addition, resin sheets of various materials can be used depending on the application.
Moreover, as a laminated glass which can be used for this invention, resin injection laminated glass other than the said film laminated glass may be sufficient.

(Sealing method)
The present invention is characterized in that the sealing material is applied or adhered to the edge of a laminated glass with a thickness of 1 mm to 5 mm.
The application method is not particularly limited, but in the case of a sealing material, application using a seal gun and pressing with a spatula can be mentioned, and in the case of a two-component mixed factory seal, depending on the hand-mixed two-component mixed seal gun and spatula In the case of a resin such as a presser and a paint, application with a roller or a brush can be mentioned.
Adhesion mainly refers to adhering the tape to the fore edge, and when the tape is an adhesive tape, it may be applied to the forehead as it is.
In the case where the laminated glass is chamfered glass, since the intermediate film portion of the fore edge is a recess, whitening can be more effectively prevented by applying or bonding a sealing material to the recess.
Furthermore, whitening can be further prevented by applying a resin to the edge of the laminated glass and adhering the tape.
As such a combination of resin and tape, a combination of the sealing material and butyl tape, a combination of aluminum tape and sealing material, a combination of acrylic tape and sealing material, and the like are preferable.
In addition to the case where the laminated glass is put one by one in the sash and the glass edge is hidden, there is a case where the laminated glass is disliked by use of the sash by design and the glass is seen to be connected. For example, there are those obtained by a glass screen method that eliminates the sash on the vertical side and connects the glass horizontally and does not use a sash frame. Even in such a case, the present invention can prevent whitening by processing the edge.

Example 1
300 mm square resin-injected laminated glass using 6 mm thick glass (Float glass manufactured by Asahi Glass Co., Ltd.), acrylic adhesive tape (Sumitomo 3M Co., VHB acrylic foam structural bonding tape) and acrylic resin (Kemetal Co., Naphtolan) The four sides of the forehead were sealed with a thickness of 1 mm using the following silicone sealant and polyisobutylene sealant. Moreover, it compared with the glass sealed with the butyl tape and the aluminum tape, and the resin injection | pouring laminated glass which was not sealed. These cross sections are shown in FIG.
These glasses were placed in a constant temperature and humidity chamber at 70 ° C. and 95%, and the occurrence of whitening was compared. The results are shown in Table 1.

Silicone sealant: Yokohama Rubber silicone 70, primer No. 70
Polyisobutylene-based sealing material: Made of Yokohama Rubber, Milex, Primer No. 85
Butyl Tape: Mitsuboshi Belting Butyl Tape Aluminum Tape: Sumitomo 3M Aluminum Foil Tape No. 431

  As a result, the one sealed with a silicone sealant or polyisobutylene sealant did not whiten for 21 days, but the glass that was not sealed whitened within 3 days. Although both the aluminum tape and the butyl tape were effective in preventing whitening, they were not sufficient, and whitening occurred in 14 days.

Example 2
In order to further enhance the whitening prevention function of Example 1, a test body (see FIG. 2) in which the edge treatment is doubled with the primary sealing material and the secondary sealing material applied to the surface of the step portion of the glass edge is produced. The whitening prevention performance was evaluated.
The laminated glass used was the same resin-injected laminated glass as in Example 1.
As a result of putting these glasses into a constant temperature and humidity chamber at 70 ° C. and 95% and comparing the occurrence of whitening, no whitening was observed until 28 days.

Butyl tape: PG naphtham butyl tape φ1.7mm
Hot melt butyl: Yokohama Rubber HOTELT M-145 Thickness 1mm
Silicone sealant: Yokohama Rubber Silicone 70, Primer No. 70
Polyisobutylene-based sealing material: Yokohama Rubber Milex, Primer No. 85

Example 3
The same whitening prevention performance as Example 1 was evaluated also about the film laminated glass.
The film laminated glass used here is a glass produced by using two pieces of 6 mm float glass and using 0.76 mm polyvinyl butyral (PVB) and ethylene vinyl acetate (EVA) as an intermediate film. The glass used here was a ramipene manufactured by Nippon Sheet Glass Co., Ltd. and had a thickness of 12.3 mm.
As a result of the whitening acceleration test in a constant temperature and humidity state of 70 ° C. and 95% for 28 days, the whitened glass is a glass that has not been subjected to sealing treatment, and whitening occurs in the test specimen in which water vapor transmission is reduced by the sealing material. There was no.

Example 4
Considering the use of laminated glass with a small opening in a horizontal window, a joint adhesion test of the sealing material was performed.
As the adhesion test, an H-type test body that is a test for sealing the sealing material was produced and the test was performed (see FIG. 3). A sealing material was applied to the surface of a 5 cm square float glass so as to be 1 mm thick, and after 4 weeks, a test specimen for adhesion to the glass surface was prepared using a sealing material for glass for 4 weeks. After the lapse of time, an adhesion test was performed. The tensile speed was 5 mm / min, and was judged according to the judgment situation.
Two types of sealing materials were used: a silicone-based sealing material and a polyisobutylene-based sealing material, and the same two types of sealing materials for bonding glass to each other.

Silicone sealant: Yokohama Rubber silicone 70, primer No. 70
Polyisobutylene-based sealing material: Made of Yokohama Rubber, Milex, Primer No. 85

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention.

    According to the present invention, since the processing is performed on the edge portion of the glass, the basic performance required for the laminated glass such as transparency, weather resistance, adhesion, penetration resistance, etc. is not impaired, and the atmosphere is high in humidity. Even when placed inside, it is possible to provide a laminated glass in which the penetration of water vapor from the peripheral portion of the laminated glass is small and the occurrence of whitening is small.

It is a figure which shows the cross section of the fore edge of Example 1. FIG. It is a figure which shows the cross section of the fore edge of Example 2. FIG. 6 is a diagram showing an adhesion test of Example 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing material 2 Glass 3 Intermediate film 4 Sealing material 11 for glass Primary sealing material 12 Secondary sealing material

Claims (4)

  A method for preventing whitening of laminated glass, comprising applying or bonding a sealing material to a small edge of a laminated glass with a thickness of 1 mm to 5 mm.   The whitening prevention method according to claim 1, wherein the sealing material is a sealing material used around the glass.   The whitening prevention method according to claim 1, wherein the sealing material is a combination of butyl tape and a sealing material used around the glass, or a combination of hot-melt butyl and a sealing material used around the glass.   The whitening prevention method according to claim 2 or 3, wherein the sealant is a two-component silicone sealant or a polyisobutylene sealant.

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