JPS6027630A - Sound insulating sandwich glass - Google Patents

Abstract

PURPOSE:To manufacture the titled sandwich glass having excellent sound insulating property at a relatively low cost, by bonding a pair of glass plates with an interlayer composed of specific amounts of a vinyl chloride-ethylene-glycidyl methacrylate terpolymer, etc. and a plasticizer. CONSTITUTION:A sound insulating sandwich glass having excellent sound insulating property is manufactured at a relatively low cost, by bonding two or more glass sheets with an interlayer composed of 100pts.wt. of a vinyl chloride-ethylene-glycidyl methacrylate terpolymer, 5-30pts.wt. of a vinyl chloride-ethylene copolymer and 10-50pts.wt. of a plasticizer. The thickness of the interlayer is preferably about 0.3-2.5mm., and the glass plate is an inorganic glass plate having a thickness of about 2-10mm.. The terpolymer is preferably the one composed of about 80-99% vinyl chloride, about 1-10% ethylene and about 1-10% glycidyl methacrylate and having an average polymerization degree of about 500-1,200.

Description

[Detailed description of the invention] The present invention relates to laminated glass with excellent sound insulation properties.

Conventionally, laminated glass, which is formed by bonding two sheets of glass together with an interlayer film made of plasticized polyvinyl plaal resin, has been widely used for windows of various transportation facilities such as automobiles and airplanes, and of buildings.

Although the sound insulation properties of this laminated glass are slightly higher than that of single-pane glass, it is still not sufficient as there is a coincidence region in the sonic frequency band where sound insulation is required.

A laminated glass obtained using an interlayer film made of a vinyl chloride-ethylene-glycidyl methacrylate ternary copolymer and a plasticizer, invented by Kogi, has a sound insulation property KfE higher than that of the conventional laminated glass. Based on the knowledge that , 5 to 30 parts by weight of vinyl chloride-ethylene copolymer and 1
The present invention relates to a sound-insulating laminated glass characterized in that at least two sheets of glass are laminated together using an interlayer film containing 0 to 50% of a plasticizer.

Among the above terpolymers used in the interlayer film, vinyl chloride and ethylene greatly contribute to the sound insulation properties of the laminated glass, glycidyl methacrylate is the main one, and a preferable set of terpolymers YB is vinyl chloride. is 80-99% by weight, ethylene is 1-10% by weight, and glycidyl methacrylate is 1-10% by weight.
Weight% can be increased. In addition, the average degree of polymerization is generally 500~
1200, and the higher the value, the better the laminated glass with penetration resistance tends to be obtained6. The terpolymer can be obtained by polymerizing various starting materials by a conventionally known method, but suspension polymerization is preferred from the viewpoint of thermal stability and economical efficiency. Any suspending agent used in suspension polymerization may be used as long as it is used in the polymerization of vinyl chloride, but when a high J property that allows the properties of the interlayer film to be transmitted is required, polyvinylpyrrolidone, partially cured polyvinyl alcohol, and polyvinyl pyrrolidone may be used. Methyl ether, methylcellulose, etc. are preferably used. Furthermore, the monomers used in the polymerization are usually charged all at once at the beginning of the polymerization process, but it is also possible to charge these monomers in portions during the polymerization.

Hinyl chloride-ethylene copolymer can be obtained by the general KW & turbidity polymerization method similar to the above terpolymer, but it is a little different from the terpolymer because the raw material monomers are cheap and the polymerization operation is easy. It is available at low cost. If the amount used is too large, the adhesion of the interlayer film will be reduced, resulting in a decrease in the impact resistance of the laminated glass, and if it is too small, the cost reduction of the laminated glass will not be substantially achieved. The amount is 5 to 30 parts by weight.

As the plasticizer used in the interlayer film production, what is generally called a plasticizer for polyvinyl chloride can be widely used. Specific examples include heptatarate esters such as dioctyl phthalate and dibutyl heptatalate, adipate esters such as di-2-ethylhexyl adipate and diisodecyl adipate, and epoxy wlj conductors. The amount of plasticizer contained in the interlayer film is KIO to maintain appropriate flexibility and adhesion of the film.
~50% heavy view.

The interlayer film used in the present invention includes the above terpolymer, a vinyl chloride-ethylene copolymer, a plasticizer and, if necessary, an appropriate amount of a stabilizer, an ultraviolet absorber, an antioxidant, a lubricant, a colorant, It is obtained by forming a film from a mixture of fillers and the like by a known processing method such as an extrusion method or a calendar roll method. The film thickness is not particularly limited, but is preferably about 0.3 to 2.5%, particularly preferably about 0.3 to 1%.

Plate glass #-i used in the present invention is preferably an inorganic glass having a thickness of about 2 to 10 mm. In order to obtain a sound-insulating laminated glass, for example, the interlayer film may be sandwiched between two sheets of glass, and then heat-fused and pressed under heat and pressure. In this case, the heating humidity is preferably 80 to 200°C, usually 100 to 180°C. The pressure is the pressure necessary to ensure close contact between the glass plates and to remove bubbles at the interface and in the interlayer film layer, and is preferably 5 to 15.
Kg/(7 is preferred. For hot press bonding, conventional bonding equipment used for plasticized polyvinyl butyral MK, such as a hot press molding machine, a press roll with a heating furnace, a hydraulic or pneumatic autoclave, etc. can be used.

The obtained laminated glass can be used as it is for building windowpanes and automobile windshields, and can also be used as double-glazed glass by joining the four sides with other plate glass through a space. It is possible.

As mentioned above, the sound-insulating laminated glass of the present invention includes 100 parts by weight of the above terpolymer and 5 to 3 parts by weight of vinyl chloride-ethylene copolymer.
Since at least two sheets of glass are bonded together by an interlayer film containing 0 parts by weight and 10 to 50% by weight of plasticizer, the coincidence is lower than that of conventional laminated glass using a plasticized polyvinyl butyral interlayer film. There is almost no occurrence of this phenomenon, and it has good sound insulation properties even in frequency bands other than the coincidence region of the conventional laminated glass. In addition, the sound insulating glass of the present invention is less expensive than laminated glass using the same film in the plasticized terpolymer! li! It is possible to build

Examples of the present invention are shown below.

In addition, the measurement of sound insulation is based on JIS A 1416 K#,
Transmission loss (dB) for 16 types of sounds with frequencies of 125 to 4000 Hz was measured and expressed as the average value.

Example 1 Vinyl chloride with an average polymerization weight of 800 (approximately 93.5% by weight)
-Ethylene (approximately 4% by weight) -Glycidyl methacrylate (
2.5% by weight) copolymer, 100 parts by weight of vinyl chloride (approx.
(about 95% by weight)-ethylene (about 5% by weight) copolymer 2
A resin mixture containing 0 parts by weight and 30% by weight of a phthalic acid group plasticizer was formed into a film by extrusion to obtain an intermediate film having a thickness of 0.38%. Next, two sheets of float plate glass having a thickness of 3% were bonded together to create a laminated glass.

The sound insulation performance of this laminated glass is 125~125 according to JIS method.
When measuring the sound of 4000 Hz, it is as shown in Figure 1, and the average transmission loss at 16 points is 313 d.
It was B.

For comparison, laminated glass using a conventional plasticized polyvinyl butyral interlayer film (film thickness o, 38%, float glass thickness 3% - Comparative Example 1), and single glass with a thickness of 6% (Comparative Example 2), J! Air space between glass with KW 6% is 12%
Similar measurements were also made on the double-glazed glass (Comparative Example 3). As a result #'i in Figure 1, the order KB (average transmission loss 27.5 dB), C (average transmission loss 26.7 dB)
), as shown as D.

Example 2 - A film with a thickness of 0.76~ was produced using the resin mixture obtained in Example 1, and two sheets of glass having a thickness of 3% were bonded together to form a laminated glass. When the sound insulation properties of the obtained laminated glass were measured in exactly the same manner as in Example 1, the average transmission loss at 16 points was 1j32.6 dB.

For comparison, a laminated glass (Comparative Example 4) consisting of a plasticized polyvinyl butyral film with a thickness of 0.76% and two glass sheets with a thickness of 3%, and a vinyl chloride-ethylene-glycidyl methacrylate ternary copolymer were used. Similar measurements were carried out on a laminated glass (Comparative Example 5) consisting of two sheets of glass having a thickness of 3% (Comparative Example 5). .

Average transmission loss #i of the former 27.7dB, second 27.17
It was dB.

Example 3 The interlayer film with a thickness of 0.38% obtained in Example 1 was used, and the thickness was 6.
% and 4% plate glasses were bonded together to make a laminated glass.

The sound insulation properties of the glass were determined to be exactly the same as in Example 1, and the average transmission loss was 36.0 dB.

For comparison, a similar measurement was carried out on a laminated glass (Comparative Example 6) in which plate glasses of 6% and 4% thickness were bonded together with a plasticized polyvinyl butyral film of 0.76% thickness.

The average transmission loss was 8 dB for 3s, a small value despite the large film thickness.

Example 4 A film having a thickness of 114 mm or more was produced using the resin mixture obtained in Example 1, and two sheets of glass having a thickness of 4% were bonded together to form a laminated glass. When the sound insulation properties of the glass were measured in exactly the same manner as in Example 1, the average transmission loss was 35.7 dB.

For comparison, a glass film with a thickness of 6% and a plasticized polyvinyl butyral film with a thickness of 0.76%/a glass film with a thickness of 6% and a thickness of 0.76% were used.
76% plasticized polyvinylgtyral III/6% thickness
A similar measurement was performed on a laminated glass (comparative example?) Vc having a five-layer structure. Average transmission loss #'i35.2
It was dB.

[Brief explanation of drawings]

FIG. 1 is a graph showing the sound transmission loss at each frequency of one example of the laminated glass of the present invention and a comparative example. A...Example 1 (laminated glass with film thickness o, 38%, glass thickness 3%) B...Comparative example 1 (plasticized polyvinyl butyral film thickness 0)
．． 38%, laminated glass with a glass thickness of 3%) C... Comparative Example 2 (single glass with a thickness of 6%) D... Comparative Example 3 (double glass with a glass thickness of 6% and an air space of 12%)

Claims (1)

[Scope of Claims] 1. An intermediate containing 100 parts by weight of a vinyl chloride-ethylene-glycidyl methacrylate terpolymer, 5 to 30 parts by weight of a vinyl chloride-ethylene copolymer, and 10 to 50% by weight of a plasticizer. A sound-insulating laminated glass characterized by having at least two sheets of glass bonded together by a membrane. 2. The laminated glass according to item 1, wherein the interlayer has a thickness of about 0.3 to 25%. 3. Item 1 or F, where the thickness of the plate glass is about 2 to 10%
i. The laminated glass according to the second description.