JPH07125138A - Sound-insulating transparent rigid laminated body - Google Patents

Abstract

PURPOSE:To obtain the high coefficient of losses and decrease the dependency thereof by laminating an intermediate film with a specific thickness of vinylchloride copolymer containing dimethylphthalate between transparent rigid sheets with a specific thickness. CONSTITUTION:The sound insulation transparent rigid laminated body is obtained in such a manner that an intermediate film with a thickness of 0.1-1.5mm of vinyl chloride/vinylidene chloride copolymer containing dimethylphthalate between transparent rigid sheets with a thickness of 1.9-10mm is laminated. The unit of vinylidene chloride copolymerized acts to lower the melting point of copolymer to render the treating property excellent, in addition, to improve the inner losses, therefore, copolymer is preferably employed here in which the unit of vinyl chloride polymerized is 30-60wt.% and the unit of vinylidene chloride polymerized is 40-70wt.%. When the unit of vinyl chloride polymerized is less than 20 wt.%, the copolymer obtained is likely to be worse in coporimerization, and also to be worse in heat stability. On the contrary, when it comes to be 90 wt.% or more, the inner losses can not be obtained. In the case of dimethylphthalate, a high coefficient can be obtained through the action as a plasticizer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulating transparent hard laminate.

[0002]

2. Description of the Related Art In recent years, in urban areas, there have been problems such as residential noise due to crowded houses and noise and vibration accompanying the development of transportation. In order to solve these problems, sound-insulating laminated glass is widely used as window glass for transportation vehicles such as automobiles and window glass in buildings. The laminated glass in which the interlayer film is laminated between the opposed glasses has improved sound insulation performance as compared with single-glazing having the same total thickness. This is because the intermediate film increases the internal loss and improves the transmission loss. On the other hand, the sound insulation performance of single glass is remarkably deteriorated by the coincidence effect in the frequency range around 2000 Hz. The coincidence effect is a phenomenon in which when a sound wave is incident on glass, a transverse wave is conducted on the glass surface due to the rigidity and inertia of the glass, the transverse wave and the incident sound resonate, and as a result, sound transmission occurs. .

Therefore, it is said that the larger the internal loss of the interlayer film in the coincidence frequency range, the more effective the sound insulating performance is. The interlayer film of the sound insulating laminated glass includes plasticized polyvinyl butyral, a photo-curable resin injection cured film, Plasticized vinyl chloride resins, ethylene / vinyl acetate copolymers and the like are generally used.

[0004]

Generally, the internal loss of the interlayer film has temperature dependence and shows different characteristics depending on the type and thickness of the interlayer film. For example, in a polyvinyl butyral film or the like, at a high temperature of 30 to 40 ° C., the internal loss becomes large and the sound insulation performance is improved. However, at a low temperature of 0 to 10 ° C, the internal loss becomes small, so that the sound insulation performance at the coincidence frequency is deteriorated.

[0005]

The present invention relates to a sound-insulating transparent hard laminate excellent in internal loss as described below.

A sound-insulating transparent hard laminate comprising a transparent hard plate having a thickness of 1.9 to 10 mm and an interlayer film of vinyl chloride / vinylidene chloride copolymer containing dimethyl phthalate having a thickness of 0.1 to 1.5 mm.

The vinyl chloride / vinylidene chloride copolymer in the present invention contains, although not particularly limited to, 20 to 90% by weight of vinyl chloride polymerized units and 10 to 80% by weight of vinylidene chloride polymerized units. Those are preferable. The copolymer may contain other monomer unit components in addition to the both monomer unit components, but is usually substantially composed of both monomer unit components. In particular, the polymerized units of vinylidene chloride lower the softening point of the copolymer to improve the processability and improve the internal loss. Copolymers containing 40 to 70% by weight of units are preferred. When the polymerized unit of vinyl chloride is less than 20% by weight, the copolymerizability of the resulting copolymer tends to be poor and the thermal stability tends to be poor. If it exceeds 90% by weight, it becomes difficult to obtain high internal loss.

The dimethyl phthalate compounded in the copolymer in the present invention acts as a plasticizer, has good compatibility with the copolymer, and has a high loss coefficient. The compounding amount of dimethyl phthalate is 100 parts by weight of the copolymer.
10 to 100 parts by weight is preferable, and 20 to 80 parts by weight is particularly preferable. It is also possible to use dimethyl phthalate together with other plasticizers. However, even in that case, dimethyl phthalate is the main component (dimethyl phthalate based on the total amount of plasticizer).
50% by weight or more) is preferable.

In the present invention, the method for producing the copolymer may be a conventional method for producing a vinyl chloride / vinylidene chloride copolymer, and examples thereof include suspension polymerization, emulsion polymerization and solution polymerization. From the viewpoint of properties, emulsion polymerization is preferred. The catalyst used in the polymerization reaction is generally known oil-soluble organic peroxides, oil-soluble organic non-peroxides, water-soluble inorganic peroxides, or redox type catalysts when polymerization is carried out at low temperatures. 0.01 to 1% by weight can be used. The emulsifying agent or suspending agent used in emulsion polymerization or suspension polymerization is a generally known emulsifier or suspension agent in an amount of 0.05 to
5% by weight can be used. In the present invention, it goes without saying that a commercially available vinyl chloride / vinylidene chloride copolymer can be used.

In the present invention, the vinyl chloride / vinylidene chloride copolymer may further contain a heat stabilizer and other compounding agents, if necessary. Generally, when forming an interlayer film of laminated glass and when bonding and processing the interlayer film with glass, the interlayer film is exposed to high heat for a relatively long time. Therefore, in order to improve the thermal stability of this interlayer film, it is preferable to add a thermal stabilizer. Examples of heat stabilizers include fatty acid lead salts such as stearic acid, fatty acid metal salt compounds such as cadmium salts, barium salts and zinc salts, inorganic lead compounds such as basic lead sulfate, and organic tin compounds such as dialkyltin compounds. Is mentioned. These heat stabilizers are preferably added in an amount of 0.5 to 100 parts by weight based on 100 parts by weight of the copolymer.
It is used in a ratio of 5 parts by weight.

Further, the vinyl chloride / vinylidene chloride copolymer may optionally contain an ultraviolet absorber, an antioxidant,
A compounding agent such as a coloring agent can also be compounded. As the ultraviolet absorber, benzotriazole or the like is used, for example, 2 (2'-hydroxy-5'-methylphenyl) benzotriazole, (2'-hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2 (2'-hydroxy
-4'-octoxyphenyl) benzotriazole and the like are preferably used.

A composition obtained by mixing the above-mentioned compounding agent with the copolymer of the present invention can be used, for example, in a kneading machine capable of shear-melting a resin such as a roll molding machine, a twin-screw kneading machine, an extruder, a Banbury mixer. The obtained resin composition can be formed into a film or a sheet by a thermoforming method such as roll molding, calender molding, extrusion molding, blow molding. The thickness of this film or sheet is 0.1-
1.5 mm is preferred.

The transparent hard plate is preferably an inorganic glass which is widely used as a window glass in traffic vehicles and buildings as described above. Alternatively, it may be made of a hard plastic such as an acrylic resin or a polycarbonate resin called organic glass. The transparent hard plate used in the present invention has a thickness of 1.9 to 10 mm.

To prepare a laminate using the vinyl chloride / vinylidene chloride copolymer intermediate film obtained as described above, usually, the intermediate film is sandwiched between two transparent hard plates and heated and pressed. It may be heat-melted and pressure-bonded, and a sticking device which is usually used when a laminated body such as a laminated glass is prepared using an intermediate film can be used. In this case, the heating temperature is preferably 80 to 200 ° C, usually 100 to 180 ° C. The pressure may be a pressure required for adhering the interlayer film and the transparent hard plate and for removing bubbles that may exist in the interface and the interlayer, and is preferably 5 to 15 kg / cm ² . Further, a vacuum heating method may be used, or a combination thereof may be used.

The laminate of the present invention preferably has a three-layer structure of transparent hard plate / intermediate film / transparent hard plate, but is not limited to this and may have a multilayer structure. The thickness of the interlayer film is 0.1 to 1.5 mm. Further, the transparent hard plate having two or more may be composed of a combination of transparent hard plates having different materials. When there are two or more intermediate film layers, some of the intermediate films may be intermediate films other than the above materials. The preferred laminate of the present invention is a laminate having a three-layer structure in which an interlayer film is sandwiched between two sheets of inorganic glass (hereinafter simply referred to as glass).

[0016]

EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these examples. "Parts" in Examples and the like indicate parts by weight.

The resonance method (mechanical impedance method) based on the central excitation method was used for measuring the loss coefficient. this is,
This is a method in which the mechanical impedance at the excitation point in the center of the sample is detected, and the loss coefficient is calculated from the frequency showing the peak of the impedance curve in the vibration mode and the half-value width (width of the frequency that is 3 dB smaller than the peak value). The size of the test piece is 25 mm × 300 mm, and the structure is that the interlayer film is laminated between two pieces of 2.8 mm glass.

Example 1 900 parts of water containing 49 parts of vinyl chloride, 75 parts of vinylidene chloride and 0.275 parts of potassium persulfate,
Charge 1.650 parts of sodium dodecylbenzene sulfonate as a surfactant into the reactor and stir at 50 ° C with stirring.
The reaction was carried out for 13 hours to obtain a copolymer.

50 parts of dimethyl phthalate and 3 parts of tin stabilizer were added to 100 parts by weight of the obtained copolymer. 17
Roll kneading at 0 ℃ for 10 minutes, press at 140 ℃ for 5 minutes,
A film having a thickness of 0.3 mm was obtained. This film is 2.8m thick
It was sandwiched between two m 2 glass plates and pre-compressed in a vacuum bag at 120 ° C. under reduced pressure, and then thermocompression-bonded in an autoclave at 140 ° C. and 10 kg / cm ² to prepare a sound-insulating transparent hard laminate. 25mm for this
A test piece was obtained by cutting into a strip of × 300 mm. The loss coefficient at 0 ° C., 20 ° C. and 40 ° C. of this test body was measured.

Comparative Example 1 A test body was prepared and tested in the same manner as in Example 1 except that polyvinyl butyral having a glass transition temperature of 13 ° C. was used as the intermediate film.

Comparative Example 2 A test body was manufactured and tested in the same manner as in Example 1 except that a photocurable resin-injection-cured film was used as the intermediate film.

Comparative Example 3 A test sample was prepared and tested in the same manner as in Example 1 except that an ethylene-vinyl acetate copolymer was used as the intermediate film.

Comparative Example 4 A test body was prepared and tested in the same manner as in Example 1 except that a commercially available plasticizer-blended soft vinyl chloride resin was used as the interlayer film.

The results of the loss factors measured in the examples and comparative examples are shown in FIGS.

FIG. 1 is a graph showing the sound insulation performance of a transparent hard laminate at 0 ° C. as a loss coefficient with respect to frequency. The loss factor of the hard transparent laminate of Example 1 in which the interlayer film in which vinyl chloride / vinylidene chloride copolymer was mixed with dimethyl phthalate was laminated between the glasses was higher than that of other comparative examples at any frequency. It is clear that also has a high loss coefficient.

FIG. 2 is a graph showing the sound insulation performance of the transparent hard laminate at 20 ° C. as a loss coefficient with respect to frequency. As in FIG. 1, it is apparent that Example 1 has a higher loss coefficient at any frequency than the other comparative examples.

FIG. 3 is a graph showing the sound insulation performance of the transparent hard laminate at 40 ° C. as a loss coefficient with respect to frequency. As in FIGS. 1 and 2, it is apparent that Example 1 has a higher loss coefficient at any frequency than other comparative examples.

[0028]

The sound-insulating transparent hard laminate of the present invention has the effects of having a high loss coefficient and having little temperature dependence.

[Brief description of drawings]

FIG. 1 is a graph showing the sound insulation performance of a transparent hard laminate at 0 ° C. as a loss coefficient with respect to frequency.

FIG. 2 is a graph showing the sound insulation performance of a transparent hard laminate at 20 ° C. as a loss coefficient with respect to frequency.

FIG. 3 is a graph showing the sound insulation performance of a transparent hard laminate at 40 ° C. as a loss coefficient with respect to frequency.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroyuki Watanabe Inventor Hiroyuki Watanabe 1150 Hazawa-machi, Kanagawa-ku, Yokohama, Kanagawa Asahi Glass Co., Ltd. Central Research Laboratory

Claims (3)

[Claims] 1. A sound-insulating transparent hard laminate comprising a transparent hard plate having a thickness of 1.9 to 10 mm and an interlayer film of vinyl chloride / vinylidene chloride copolymer containing dimethyl phthalate having a thickness of 0.1 to 1.5 mm. body. 2. A unit in which the copolymer is a vinyl chloride polymerized unit 20 to 20.
The sound-insulating transparent hard laminate according to claim 1, which is a copolymer containing 90% by weight and 10 to 80% by weight of a polymerized unit of vinylidene chloride. 3. The sound-insulating transparent hard laminate according to claim 1, wherein the transparent hard plate is plate glass.