JPH0624809A - Intermediate film for laminated glass and laminated glass using the same - Google Patents

Abstract

PURPOSE:To improve a scattering preventive property of the broken piece, transparency and a sound shielding property by incorporating dimethyl formamide in an intermediate film for specific laminated glass. CONSTITUTION:30-60 pts.wt. plasticizers, 5-30 pts.wt. dimethyl formamide, 0.5-5 pts.wt. heat stabilizers, 0.05-1 pt.wt. UV absorber, an antioxidant and a resins with 500-1200 average polymerization degree, and they are kneaded at 100-140 deg.C to form a sheet product and obtain the intermediate film for laminated glass in 0.3-1.6mm thickness. The intermediate film is sandwiched between two transparent glass sheets and is preliminarily stuck at 100-120 deg.C under reduced pressure, and then is heated at 100-150 deg.C under 5-15kg/cm<2> pressure in an autoclave to perform normal adhesion and then the laminated glass is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlayer film for laminated glass having excellent sound insulation and a laminated glass using the same.

[0002]

2. Description of the Related Art Laminated glass in which a plasticized polyvinyl butyral resin film is laminated between two transparent glass plates is widely used, for example, as window glass for automobiles and buildings.

This type of laminated glass is excellent in basic characteristics such as scattering of glass fragments and good transparency.
Poor sound insulation. In particular, in the mid-high range near 2000 Hz, the sound insulation is lowered due to the so-called coincidence effect.

The coincidence effect is that when a sound wave is incident on the laminated glass, a transverse wave propagates on the glass surface due to the rigidity and inertia of the glass, and the transverse wave resonates with the incident sound.
This is a phenomenon in which sound transmission occurs.

Recently, for example, with the aim of further improving the living environment, the demand for sound insulation is increasing more and more for window glass of buildings, and laminated glass exhibiting excellent sound insulation performance is required.

Conventionally, it has been proposed to improve the sound insulation by adding an appropriate amount of dimethylformamide to an interlayer film for laminated glass made of a plasticized polyvinyl butyral resin film (see JP-A-3-112835). ).

It is also known that the sound insulating property is improved by using an interlayer film for laminated glass which is made of a plasticized adhesive vinyl chloride resin film (Japanese Patent Laid-Open No. Sho 60).
-27630 and JP-A-3-33039).

[0008]

Such conventional sound insulating interlayer films for laminated glass and laminated glass have excellent anti-scattering properties and excellent transparency, and prevent the sound insulating property from being lowered due to the coincidence effect. Performance is improved.
However, there is still room for improvement.

The object of the present invention is to prevent the deterioration of sound insulation due to the coincidence effect without impairing the basic characteristics required for laminated glass such as the fact that glass fragments are not scattered and the transparency is good. An object is to provide an excellent interlayer film for laminated glass and laminated glass.

[0010]

The above object is to make an intermediate film for laminated glass comprising a plasticized adhesive vinyl chloride resin film contain an appropriate amount of dimethylformamide, and to provide the intermediate film with a planar shape. It can be achieved by laminating between glass plates.

In the present invention, as the adhesive vinyl chloride resin, a known adhesive vinyl chloride resin used in an interlayer film for laminated glass is used. For example, a vinyl chloride-glycidyl methacrylate copolymer, a vinyl chloride-ethylene-glycidyl methacrylate copolymer, or a vinyl chloride resin containing these copolymers is suitable.

The vinyl chloride-glycidyl methacrylate copolymer generally contains 90 to 99% by weight of vinyl chloride component and 10 to 1% by weight of glycidyl methacrylate component.
Then, those having an average degree of polymerization of 500 to 1200 are used.

As the vinyl chloride-ethylene-glycidyl methacrylate copolymer, generally, the vinyl chloride component is 80 to 98% by weight, the ethylene component is 10 to 1% by weight, and the glycidyl methacrylate component is 10 to 1% by weight. so,
An average degree of polymerization of 500 to 1200 is used.

As the vinyl chloride resin containing these copolymers, the above copolymers may be used in combination with vinyl chloride-
Ethylene copolymer, vinyl chloride-vinyl acetate copolymer,
An appropriate amount of vinyl chloride resin such as vinyl chloride-acrylic acid ester copolymer or vinyl chloride-alkyl vinyl ether copolymer is used.

In the present invention, the plasticizer 30 is usually added to 100 parts by weight of the adhesive vinyl chloride resin.
-60 parts by weight, preferably 30-45 parts by weight, and dimethylformamide 5-30 parts by weight are blended.

As the plasticizer, known plasticizers used in this type of interlayer film are used. For example, phthalic acid esters such as dioctyl phthalate, aliphatic dibasic acid esters such as dioctyl adipate and dibutyl sebacate, and epoxy derivatives such as epoxidized soybean oil are used.

In addition, triethylene glycol di-2-
Dihydric alcohol esters such as ethyl butyrate and triethylene glycol di-2-ethylhexoate can also be used.

If the blending amount of the plasticizer is too large, the penetration resistance of the interlayer film is lowered, and the plasticizer oozes out to lower the adhesiveness to the glass plate. On the other hand, if the blending amount of the plasticizer is too small, the flexibility of the interlayer film decreases.

On the other hand, if the content of dimethylformamide is too large, the transparency of the interlayer film will be lowered. On the contrary, if the content of dimethylformamide is too small, the fluidity of the interlayer film will not be increased so much and sufficient sound insulation will be obtained. Can't get

Further, in the present invention, a heat stabilizer, an ultraviolet absorber, an antioxidant, a colorant and the like are used if necessary. In particular, in order to prevent coloration, a heat stabilizer is usually added in many cases. Further, in order to improve the weather resistance, an ultraviolet absorber is usually added in many cases.

The heat stabilizer is generally added in an amount of 0.5 to 5 parts by weight based on 100 parts by weight of the adhesive vinyl chloride resin. The ultraviolet absorber is generally added in an amount of 0.05 to 1 part by weight based on 100 parts by weight of the adhesive vinyl chloride resin.

Examples of the heat stabilizer include organic tin compounds such as dibutyl tin laurate, dibutyl tin malate and dioctyl tin malate, and organic tin-containing sulfur compounds of dibutyl or dibutyl or dioctyl tin mercapto type.

The UV absorber is preferably a benzotriazole type, for example, Tinubin P (trade name), Tinuvin 320 (trade name), Tinuvin 326 (trade name), Tinuvin 328 (trade name) manufactured by Ciba Geigy. Etc.

In the present invention, the above-mentioned compound is uniformly mixed, and the mixture is kneaded by an extrusion method, a calender method or the like and formed into a sheet to produce an interlayer film for laminated glass. In this case, the mixture is kneaded at a temperature not lower than the melting point of the resin and at a temperature at which dimethylformamide does not evaporate, for example, in the range of 100 ° C to 140 ° C.

The thicker the film, the better the sound insulation, but practically it is the same as the film thickness of a normal interlayer film for laminated glass, and is generally in the range of 0.3 to 1.6 mm.

In order to manufacture a laminated glass using the thus obtained intermediate film, generally, the intermediate film is sandwiched between two transparent glass plates, and this is put in a rubber bag, for example, and sucked under reduced pressure to about 100 to 120. Pre-bonded at ℃, then at about 100-150 ℃ in an autoclave, about 5
The main adhesion is performed at a pressure of -15 kg / cm ² . In this way, a sound-insulating laminated glass is manufactured.

The glass plate is not limited to a flat plate, but may be a curved plate. Further, the glass plate is not limited to be transparent, and may be semitransparent or opaque. Further, the number of glass plates is not limited to two and may be three or more.

[0028]

When a suitable amount of dimethylformamide is contained in the interlayer film for laminated glass composed of a plasticized adhesive vinyl chloride resin film, the fluidity of the resin film is increased by the action of this dimethylformamide which is a polar solvent. Will increase.

When such an intermediate film is laminated between the flat glass plates, the two glass plates sandwiching the film due to the deformation of the resin film itself are extremely easily deformed.

Therefore, the energy of the sound wave transmitted to the glass plate is absorbed or weakened by the intermediate film, and in particular, 200
In the mid-high range near 0 Hz, deterioration of sound insulation due to the coincidence effect is prevented.

[0031]

EXAMPLES Examples and comparative examples of the present invention will be shown below. Example 1 Production of interlayer film for laminated glass Vinyl chloride-ethylene-glycidyl methacrylate copolymer having an average polymerization degree of 680 (93% by weight of vinyl chloride, 5% by weight of ethylene, 2% by weight of glycidyl methacrylate) 100
40 parts by weight of dioctyl adipate, 1.5 parts by weight of dioctyltin mercapto-based heat stabilizer (TBS # 8831, manufactured by Nitto Kasei Co., Ltd.), 0.3 parts by weight of benzotriazole-based ultraviolet absorber (Tinuvin P: manufactured by Ciba Geigy), 0.3 parts by weight. Parts by weight,
Dimethylformamide (5 parts by weight) was mixed, and a film was formed by an extrusion method (extrusion temperature: 120 to 130 ° C.) to a thickness of 0.
A 38 mm transparent interlayer film for laminated glass was obtained.

Production of Laminated Glass Using the above-mentioned interlayer film, it was sandwiched from both sides with transparent float glass (length 30 cm × width 30 cm × thickness 3 mm), placed in a rubber bag, and removed under a vacuum of 20 mmHg for 20 minutes. After the evacuation, it was transferred to an oven at 110 ° C. while being deaerated, and further vacuum pressed while holding at 110 ° C. for 30 minutes.

The laminated glass pre-bonded in this manner was heated in an air-type autoclave at a temperature of 135 ° C. and a pressure of 1
Main bonding was carried out for 20 minutes under the condition of 2 kg / cm ² to produce a transparent laminated glass.

Evaluation of Sound Insulation Property of Laminated Glass The sound insulation performance of this laminated glass was measured for sounds of 125 to 4000 Hz according to JIS A1416, and a graph showing the relationship between sound frequency (Hz) and transmission loss (dB) was obtained. It was created, and the minimum transmission loss (TL value) in the mid-high range near the sound frequency of 2000 Hz, which is a problem, was determined. As a result, the TL value is 38 dB, which indicates excellent sound insulation.

The basic characteristics required for laminated glass are
When measured according to JIS R3205, this laminated glass satisfied this standard.

Example 2 In Example 1, the compounding amount of dimethylformamide was adjusted to 2
Changed to 0 parts by weight. Other than that was performed like Example 1. As a result, the TL value was 38 dB, which was excellent in sound insulation and satisfied JIS R3205.

Example 3 In Example 1, the amount of dioctyl adipate added was 3
The amount was changed to 0 part by weight, and the compounding amount of dimethylformamide was changed to 30 parts by weight. Other than that was performed like Example 1. As a result, the TL value was 39 dB, indicating excellent sound insulation and satisfying JIS R3205.

Example 4 In Example 1, the amount of dioctyl adipate added was 3
The amount was changed to 5 parts by weight, and the compounding amount of dimethylformamide was changed to 20 parts by weight. Other than that was performed like Example 1. As a result, the TL value was 38 dB, which was excellent in sound insulation and satisfied JIS R3205.

Example 5 In Example 4, 35 parts by weight of dioctyl adipate was changed to 35 parts by weight of dioctyl phthalate. Other than that was performed like Example 4. As a result, the TL value is 38d
B showed excellent sound insulation and satisfied JIS R3205.

Example 6 In Example 4, 35 parts by weight of dioctyl adipate was changed to 35 parts by weight of dibutyl sebacate. Other than that was performed like Example 4. As a result, the TL value is 39 dB
It showed excellent sound insulation and satisfied JIS R3205.

Comparative Example 1 In Example 1, no dimethylformamide was added. Other than that was performed like Example 1. As a result, the TL value was 35 dB, and the sound insulation was inferior to that of each example. In addition, JIS R3205 is satisfied.

[0042]

As described above, the interlayer film of the laminated glass of the present invention is the interlayer film for laminated glass, which is made of the plasticized adhesive vinyl chloride resin film, and contains dimethylformamide. Energy can be absorbed or weakened, and a decrease in sound insulation due to the coincidence effect can be prevented.

The interlayer film of the laminated glass of the present invention has the same transparency and impact resistance to impact as the conventional interlayer film for laminated glass comprising a plasticized polyvinyl butyral resin film or an adhesive vinyl chloride resin film. It has good penetrability, good adhesion between glass and interlayer film, and is excellent in safety because glass fragments do not scatter when broken.

Therefore, the interlayer film of laminated glass and the laminated glass of the present invention are particularly suitable for use as window glass for buildings and the like which require high sound insulation performance.

Claims (2)

[Claims] 1. An interlayer film for laminated glass, characterized in that the interlayer film for laminated glass, which comprises a plasticized adhesive vinyl chloride resin film, contains dimethylformamide. 2. A laminated glass, wherein the interlayer film according to claim 1 is laminated between planar glass plates.