JPH07279128A - Transparent sound insulating laminated plate and its manufacture - Google Patents

Abstract

PURPOSE:To provide a lightweight laminated plate excellent in sound insulating property by interposing an ordinary temperature hardening type polymer adhesive between a plurality of transparent methacrylic resin plates, covering it with a heat retaining material followed by hardening, and imparting a prescribed beam transmittance. CONSTITUTION:A soft vinyl chloride gasket 2 is interposed between the peripheries of transparent methacrylic resin plates 1, 3, an acrylic ordinary temperature hardening type polymer adhesive is injected to the inner part, and the surface is covered with a heat retaining material followed by hardening to form an adhesive layer 4. In the formation of such a laminated plate, full beam transmittance is set to 70-90%, haze value to 0.1-20%, and the peak value of loss tangent (tan delta) at -20 deg.C-70 deg.C to 0.2-1. This laminated plate is set in an express-highway, railroad or other noise generating place, and used as a wall body having transparence and sound insulating property. Thus, a lightweight wall body excellent weather resistance and impact resistance can be easily manufactured.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention provides a transparent soundproof wall material for railroads or roads, which has excellent performance. It has high transparency, excellent visibility, soundproofing performance, weather resistance,
The present invention relates to a transparent soundproof laminated plate having improved impact resistance, penetration resistance, anti-scattering performance, etc., and a method for producing the same.

[0002]

2. Description of the Related Art The noise generated by running trains and automobiles has increased more and more in recent years due to the increase in speed, and has a serious impact on the living environment for residents along the railway line, which is a major social problem. Has become. The current countermeasures against the noise problem are to install noise barriers along the railway or road to block or reduce noise.

So far, as the material of the soundproof wall, mainly inorganic materials such as concrete and slate board and organic materials such as a single polycarbonate resin (hereinafter referred to as PC) and a single methacrylic resin have been practically used. ing. Also,
Also in patents, for example, in Japanese Examined Patent Publication No. 59-45509, an adhesive composition made of a three-component system is injected between laminated plates made of inorganic glass, methacrylic resin, PC, etc., and polymerized and cured at room temperature for adhesion. A method for obtaining a transparent sound insulating material is described. Furthermore, JP-A-5-31864
As described in the report, there is a method for producing a transparent sound insulating board by casting acrylic syrup containing polyurethane obtained by introducing alkenyl groups at both ends between two or more acrylic resin layers by casting polymerization. Proposed.

[0004]

However, since inorganic materials such as concrete and slate boards are opaque, the visibility is blocked, the field of view is narrowed, the sunlight is blocked, and it depends on artificial lighting. There are problems such as increased eye fatigue, and there is also a problem that the soundproofing performance is not always sufficient. For organic materials, use P
C has a major problem that it is considerably inferior in weather resistance to inorganic materials and methacrylic resins, while C alone is inferior in impact resistance and penetration resistance to the above materials. Furthermore, even with these organic materials, there is a problem that the soundproofing performance is insufficient by itself.

Further, as for Japanese Patent Publication No. 59-45509, in order to cause a curing reaction by injecting a compound and a monomer containing a ternary vinyl group and a monomer into an adhesive layer and then injecting them into a laminate. In addition to the complicated work process, it is difficult to say that it is advantageous in terms of cost because there are several kinds of substances used for synthesizing the adhesive. Furthermore, since the adhesive contains polypropylene glycol groups, etc., which have extremely high water absorption, the water absorption of the adhesive is significantly increased, and after a long time, a peeling phenomenon occurs due to the influence of moisture at the interface between the laminate and the adhesive layer. There was also the problem of doing. Regarding JP-A-5-31864, although the problem of water absorption is considerably improved, when an adhesive containing acrylic syrup as a main component is cast-polymerized as it is at room temperature, the adhesive in the laminate is Since the progress of the curing reaction varies depending on the location, it becomes difficult to form a uniform adhesive layer, and peeling or bubbles ( Hereinafter, there is still a drawback that defects such as peeling are likely to occur. Moreover, such a phenomenon becomes remarkable as the size of the laminated plate increases, for example, when the length × width is 1 m × 1 m or more.

The same applies to Japanese Examined Patent Publication No. 59-45509. By the way, it is very important to solve this noise problem in order to further increase the speed of the current Shinkansen, but as mentioned above, various materials and proposals currently used for noise barriers are proposed. The materials used have merits and demerits in performance and the like, and cannot be said to be sufficient for noise suppression. The present invention solves the above-mentioned problems of the conventional soundproof wall material, is lightened at the same time, has a relatively simple work process, and suppresses the cost increase, and a transparent soundproof laminate and its manufacture. It provides the law.

[0007]

Means for Solving the Problems As a result of intensive studies made by the present inventors in order to solve the above-mentioned problems, as a result, they are transparent and have excellent visibility, and also have soundproof performance, weather resistance performance, impact resistance performance, penetration resistance performance, and anti-scattering performance. The performance and the like have been improved, defects such as peeling have not been observed at the interface between the laminate and the adhesive layer, the weight can be reduced, and the transparent soundproof laminate has been obtained in terms of cost. Further, the working process of the present invention is relatively simple, and is a manufacturing method of a transparent soundproofing laminated plate which is advantageous in mass production of a large product while suppressing the occurrence of peeling.

That is, the present invention is one in which at least two or more transparent methacrylic resin units or laminates are integrated by interposing a room temperature curable polymerization adhesive, and have a total light transmittance. 70-95%, haze value 0.1-
20%, and loss tangent (ta
It is a transparent soundproofing laminated plate having a peak value of nδ) of 0.2 to 1.

In the transparent soundproof laminate of the present invention, it is particularly preferable that the center of the laminate is a PC and the surface layer has a methacrylic resin layer, and the room temperature-curing polymerization adhesive is an acrylic adhesive. Is preferred. Further, the method for producing a transparent sound-insulating laminate of the present invention is a method of injecting a room temperature-curable polymerization adhesive between at least two or more transparent methacrylic resin simple substances or laminates, and By covering the whole with a heat insulating material and curing the polymerization adhesive to integrate it, it becomes possible to manufacture a plate having a particularly large size without causing peeling or the like.

Further, the application of the transparent soundproof laminate of the present invention is suitable for a transparent soundproof wall for railways or roads. The transparent soundproof laminate of the present invention will be described in detail below. As the transparent methacrylic resin plate in the present invention, almost all of the transparent methacrylic resin plate containing methacrylate as a main component can be used. For example, impact-resistant methacrylic resin plate, super heat-resistant methacrylic resin plate, methacrylic resin plate biaxially stretched 3 to 5 times, transparent methacrylic resin plate with mesh, etc. It can be expected to improve properties, impact resistance, penetration resistance, anti-scattering property, and heat resistance.

A transparent methacrylic resin laminate is
A transparent resin plate containing methacrylic resin on the surface layer, such as P
C, polystyrene, transparent ABS resin, vinyl chloride resin,
It is a multi-layer board having a polyester resin or the like at its center. Particularly preferred is that the surface layer is a methacrylic resin layer and the central portion is P
C is a coextrusion plate. Alternatively, the surface of the PC may be surface-treated with a hard coat such as a silicon-based, acrylic-based, urethane-based or the like. PC like this
By using as a central part, while maintaining transparency,
Further improvement of impact resistance, penetration resistance, anti-scattering property, and heat resistance is achieved.

Next, two or more transparent methacrylic resin simple substances or laminates are laminated by laminating the peripheral portions of the plates using a soft vinyl chloride gasket or a transparent acrylic-based bonding material. An acrylic cold-setting polymerization adhesive is injected between the laminated plates. The soft vinyl chloride gasket is not particularly limited and, for example, the same one widely used when casting and polymerizing a methacrylic resin can be used. Further, the transparent acrylic adhesive is not particularly limited, either.
For example, a commercially available transparent tape type one side of which is covered with a release film is preferable.

As the room temperature curable polymerization adhesive, an acrylic adhesive is particularly preferable, and a combination mainly containing the following components (1) to (3) is preferable. Ingredient (1)
Is a monomer selected from the monomers of methacrylic acid alkyl esters having an alkyl group with 1 to 10 carbon atoms of 14 to 70.
It is a monomer containing, by weight, preferably methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, butyl methacrylate, isobutyl methacrylate or the like. If less than 14% by weight, the required mechanical strength, heat resistance, hardness, etc. cannot be obtained, and if more than 70% by weight, sufficient viscoelasticity, impact resistance, etc. cannot be obtained. % Is preferable.

The component (2) contains 85 to 5% by weight of a monomer selected from alkyl acrylate monomers having an alkyl group having 1 to 8 carbon atoms, preferably acrylic acid. Monomers such as butyl, isobutyl acrylate, ethyl acrylate, and 2-ethylhexyl acrylate. If the amount exceeds 85% by weight, the required heat resistance, weather resistance, mechanical strength, etc. are reduced, and if less than 5% by weight, sufficient viscoelasticity, low temperature characteristics, impact resistance, etc. cannot be obtained. It is preferable that the content is up to 20% by weight.

Further, the component (3) is the above (1) or (2).
Obtained by polymerizing or copolymerizing 1 to 2 with a number average molecular weight of 500 to 200,000.
It contains 5% by weight. Preferred are those obtained by polymerizing butyl acrylate, isobutyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, isobutyl methacrylate or the like alone or by copolymerizing two or more kinds. If the content of component (3) is less than 1% by weight, the effects of accelerating reaction during curing, improvement of shrinkage and suppression of heat generation cannot be obtained, and if it exceeds 25% by weight, the viscosity of the adhesive becomes too high and the workability is improved. Therefore, the amount of 5 to 20% by weight is preferable. In addition, if the number average molecular weight is less than 500, the above-mentioned effects such as acceleration of the reaction cannot be obtained.
If it exceeds 50,000, the viscosity of the adhesive becomes too high and the workability described above is deteriorated. Therefore, the number average molecular weight is 500.
It is preferably about 150,000 polymers or copolymers.

Instead of the monomer of component (1) or component (2), a monomer that is crosslinkable with the monomer of component (1) or component (2), for example ethylene glycol di (meth). It is also possible to use a copolymer of polyfunctional unsaturated monomers such as acrylate, diethylene glycol di (meth) acrylate, and triethylene glycol di (meth) acrylate.

Thus, the strength of the adhesive with the component (1),
Maintaining heat resistance, weather resistance, hardness, etc., component (2) maintains the viscoelasticity, impact resistance, low temperature characteristics, etc. of the adhesive, and further component (3) controls the viscosity of the adhesive, curing reaction. Has the role of promoting the reaction, suppressing contraction during reaction, suppressing reaction heat, and the like. Since the adhesive is used in the form of syrup by mixing these three components, it is easy to handle. In addition to these, if necessary, generally used plasticizers, ultraviolet absorbers, antioxidants, dyes and pigments, etc. may be used in an appropriate amount.

Incidentally, in some cases, it is sufficient to prepare, for example, two kinds of monomers as raw materials for the components of the adhesive,
Compared with the conventional similar technology, the number of kinds of raw materials is small, which is considerably advantageous in terms of cost. The catalyst to be added to the polymerization adhesive is preferably used in a three-component system in which a redox system that initiates radical polymerization using a reducing agent and a peroxide is combined with an accelerator that accelerates room temperature curing.

An organic or inorganic compound is used as the reducing agent, and an organic compound is particularly preferable, and L-ascorbic acid, gallic acid, or an organic compound containing sulfur in the molecule is preferable. As an accelerator, an organic acid salt system or an organic metal complex system of various metals is used, and a metal (cobalt, manganese) salt of naphthenic acid, a metal (vanadium) complex of acetoacetic acid ester, and a quaternary ammonium salt are used. preferable. An organic or inorganic peroxide is used as a curing agent, and in particular, organic peroxides such as cumene hydroperoxide, diisopropylbenzene hydroperoxide, paraffin hydroperoxide, methyl ethyl ketone peroxide, and dilauroyl peroxide are used. preferable.

The mixing ratio of the components (1) to (3) and the catalyst is 100 parts by weight of the whole polymerization adhesive.
The reducing agent is blended in an amount of 0.1 to 5.0 parts by weight, but if it is less than 0.1 parts by weight, the curing reaction will be slow, and if it exceeds 5.0 parts by weight, the adhesive will be colored and the strength will decrease. 0.2
~ 2.0 parts by weight. The accelerator is added in an amount of 0.1 to 5.0 parts by weight, but if the amount is less than 0.1 parts by weight, the acceleration of the curing reaction will be insufficient, and if it exceeds 5.0 parts by weight, heat will be generated, making it difficult to control the curing reaction. Since peeling occurs in the adhesive layer, it is preferably 0.2 to 3.0 parts by weight. Curing agent is 0.05 ~
Although 3.0 parts by weight is blended, if it is less than 0.05 parts by weight, the curing reaction is not sufficiently performed and unreacted monomer remains, which is not preferable, and if it exceeds 3.0 parts by weight, heat is generated to cure. It is preferably 0.1 to 2.0 parts by weight because it becomes difficult to control the reaction, or the low molecular weight component increases and the physical properties deteriorate. These catalysts are reducing agents in the polymerization adhesive,
Mix the accelerator and curing agent in this order and mix well.

What is particularly important is to mix the three-component system of these adhesives and the catalyst in a predetermined amount, whereby an adhesive layer having high transparency can be formed and a proper viscoelastic body can be obtained. Therefore, the soundproofing performance can be improved over a wide temperature range. The transparent soundproofing laminate thus obtained is significantly lighter than concrete, etc., and has improved weather resistance, impact resistance, penetration resistance, shatterproof performance, etc. even compared to organic materials. It has excellent transparency with a total light transmittance of 70 to 95% and a haze value of 0.1 to 20%, and is a scale for converting the vibration energy of sound into the vibration heat energy of a viscoelastic body. The loss tangent (tan δ) has a peak value of 0.2 to 1 in the temperature range of −20 to 70 ° C. and is excellent in soundproofing performance.

Next, the method for producing the transparent sound-insulating laminate of the present invention will be described with reference to the drawings using a transparent methacrylic resin plate as an example (the same applies when a transparent methacrylic resin laminate is used). . FIG. 1 is a cross-sectional view of a laminated plate in which two transparent methacrylic resin plates 1 and 3 are stacked using a soft vinyl chloride gasket 2.

First, a soft vinyl chloride gasket 2 is attached to the entire periphery of the transparent methacrylic resin plate 1 (even if an acrylic bonding material is used instead of the soft vinyl chloride gasket, the work is Almost unchanged.). After that, the transparent methacrylic resin plate 3 is superposed on this, and the edges of the three sides are sandwiched by a small jig such as a mantis vise (hereinafter referred to as a jig), leaving one side, and the methacrylic resin plate is placed. The edges of the three sides of 1 and 3 are joined. Thereby, as shown in FIG. 1, the adhesive layer 4 is formed between the two methacrylic resin plates. The thickness of the adhesive layer 4 is adjusted with the soft vinyl chloride gasket 2 and the jig.

The size of the methacrylic resin plate is 10 cm in length
~ 5 m, width 10 cm ~ 3 m, thickness 0.5 ~ 50 mm is selected, usually two sheets are laminated to form a laminated plate, but three or more sheets may be laminated if necessary. Alternatively, different kinds of methacrylic resin plates may be combined, and may be arbitrarily changed according to the purpose of use.

The soft vinyl chloride gasket has a diameter of 5
It is selected and used from about 10 mm (when an acrylic bonding material is used, it is selected from those having a width of 2 to 10 mm and a thickness of 0.5 to 5 mm, but in a large-sized laminated plate A width of 5 to 10 mm and a thickness of 2 to 5 mm are used). FIG. 2 shows the operation of injecting the polymer adhesive 5 into the laminate.

The one side where the above-mentioned edges are not joined serves as an injection portion for the polymerization adhesive 5. However, since the polymerization adhesive 5 is contracted in volume during the curing reaction, the injection amount of the adhesion layer 4 is set. It is preferable that the volume is equal to or larger than the volume. Therefore, it is preferable to insert a removable spacer 6 near the injection port in advance to widen and secure a necessary space portion in the adhesive layer 4. Further, in order to remove residual air inside the adhesive layer 4 after injecting the polymerized adhesive 5, an injection needle 7 for removing air is previously attached to the end portion.
It is desirable to install.

Next, a polymerization adhesive 5 containing a certain amount of a catalyst.
As shown in FIG. 2, a fixed amount is injected from one side where the edges of the laminated plate are not joined. The amount to be injected is represented by the following formula (1). W (g) = V (cm 2) × (1 + B) × D (g / cm 2) × 1.05 (1) (W in the formula is the injection weight of the polymerized adhesive 5, V is the adhesive layer 4 of the laminate. Volume, B is the volumetric shrinkage rate of the polymerized adhesive 5, D is the density of the polymerized adhesive 5, and 1.05 is a coefficient for correcting the variation in the thickness of the adhesive layer.) When pouring the polymerized adhesive 5, Laminated plate angle 10 ° ~
It is easy to operate if it is tilted at 30 ° (work can be done easily by using a tilting table whose angle can be changed arbitrarily). If the dimensions of the laminate are small (generally, the vertical and horizontal lengths are each 30 cm or less), it is difficult to secure a space portion necessary for the injection amount of the polymerized adhesive 5 in the adhesive layer 4, and therefore the bonding is performed. It is advisable not to insert the spacer 6 on one side, but also to sandwich this portion with a jig, join all the edges, and press fit from the injection needle 7 at the end using a syringe or the like.

After the polymerization adhesive 5 is injected, the spacer 6 on the injection port side is removed, and one side that is not bonded is also sandwiched and bonded by a jig. With this, all the peripheral portions of the laminated plates are joined. Further, the air inside the adhesive layer 4 is extracted from the injection needle 7 at the end, and after confirming that the air has been completely extracted, the injection needle 7 is removed, and the trace is sandwiched by a jig and joined.

Conventionally, as described above, when a curable polymerization adhesive is injected into such a laminated plate and reacted as it is, volume contraction of the adhesive occurs due to the curing reaction, and the corners and edges of the laminated plate are caused. Then, a defect such as peeling may occur at the interface between the laminated plate and the adhesive layer, and in particular, as the size of the laminated plate increases, this defect often occurs.

Therefore, the inventors of the present invention mainly use 500 in the vertical and horizontal directions.
As a result of intensive studies centering on a large-sized laminated plate having a size of mm × 500 mm or more, a method for solving this problem was found by using a heat insulating material to prevent the heat generated during the curing reaction of the adhesive from being radiated to the outside. That is, this method suppresses the unevenness of the reaction depending on the location during the curing reaction, and can prevent the occurrence of defects at the corners and the peripheral edge of the laminate, which tends to delay the reaction, and in order to form a uniform adhesive layer. It was confirmed that the effect was obtained, and that the effect became more remarkable as the size of the laminated plate increased.

As shown in FIG. 3, the outer surface of the laminated plate is covered with a heat insulating material 8 which is excellent in heat insulation, has a finely textured surface, and has a smooth surface. Make sure there are no gaps between them. On the upper part of the upper heat insulating material 8,
A glass plate or a synthetic resin plate, which is longer than the vertical and horizontal dimensions of the laminated plate by about 10 cm, has a smooth surface and has a certain weight (for example, a laminated plate having a length and width of 1 m and a thickness of 20 mm is about 50 kg). It is preferable to place the weight as a weight 9 to enhance the adhesion between the upper heat insulating material 8 and the laminated plate.

After that, the laminated plate is kept horizontal, and
By leaving it in a room temperature environment of -30 ° C for a whole day and night, it is possible to obtain a high-quality transparent sound-insulating laminate without peeling or the like. In addition, by leaving the ambient temperature high,
It can be shortened. The heat insulating material 8 has a foaming ratio of 30.
It is preferable to use, for example, a polyethylene foam type, a polyurethane foam type, or a rubber sponge type which has a fine and smooth surface and is light and has a good heat insulating property. As for the size of the heat insulating material 8, one used above and below the laminate is at least 1 more than the vertical and horizontal dimensions of the laminate.
0% or more is large, and the thickness is preferably about 10 mm to 50 mm. What is used for the four side surface portions of the laminate is the same as the length or width of the laminate and the width is 10 to 10 mm.
It is preferable that the thickness is about 50 mm and the thickness is the same as the thickness of the whole laminated plate.

Incidentally, when a gasket made of soft vinyl chloride is used, the gasket portion at the edge of the laminated plate lacks transparency, so that portion may be cut with a cutter such as a panel saw if necessary. Although such a manufacturing method has a drawback that there are many manual operations, the operation itself is easy, and further, according to this method, there are almost no restrictions on the length, width and thickness of the laminated plate, It is possible to mass-produce large-sized products at once by stacking laminated plates and heat insulating materials in multiple layers alternately, which is advantageous in terms of cost and is extremely highly practical. The effect is obtained.

[0034]

EXAMPLES The present invention will be described below with reference to examples. Total light transmittance, haze value: measured according to JIS K7105. Loss tangent (tan δ): length of 50 m from the laminated body of each example
m, 5 mm wide test piece was cut out, and a dynamic viscoelasticity measuring device (DVE-V4FT Rheospectler, manufactured by Rheology)
Was measured under the conditions of a bending mode vibration frequency of 110 Hz and a measurement temperature range of −50 to 100 ° C.

Drop weight test: From the laminate of each example, length x width is 1
A 50 mm × 150 mm test piece was cut, held horizontally, and a 2 kg steel ball was dropped vertically from a distance of 1 m in height to make a visual determination. Environmental test: Conducted a cold heat and high humidity cycle test. Measurement temperature range -20 70 ° C./half-day cycle, humidity 95% RH The results of appearance inspection after exposure are shown for 60 consecutive days (1,440 hours) or longer.

[0036]

[Example 1] Two colorless and transparent super heat-resistant acrylic resin plates (Derathermo manufactured by Asahi Kasei Kogyo Co., Ltd.) having a length x width of 500 mm x 500 mm and a plate thickness of 1.5 mm, and a diameter of 5 mm
Using a soft vinyl chloride gasket of No. 3, three side edges of the peripheral edge of the resin plate, except for one side edge, were joined with a jig to adjust the thickness of the adhesive layer to 2 mm to obtain a laminated plate. .

As a polymerization adhesive, 96 g (32% by weight) of a methyl methacrylate monomer and 144 g (48% by weight) of a butyl acrylate monomer and 60 g of a butyl acrylate polymer (equivalent to a number average molecular weight of about 1,000). (2
(0% by weight), and then add 100 p of UV absorber
An adhesive was prepared by adding pm equivalent. Polymerized adhesive 100
0.5 parts by weight of L-ascorbic acid as a catalyst
By weight, 0.75 parts by weight of a metal complex accelerator having methyl acetoacetate as a main component and ethyl acetoacetate and vanadium, and 0.3 part by weight of cumene hydroperoxide were mixed and mixed well.

The injection amount into the laminated plate was calculated according to the above formula (1), and an appropriate amount of this polymerization adhesive was injected from one side of the laminated plate which was not joined to leave the adhesive layer. The air inside was completely removed. After that, the outer surface of the laminated plate was completely covered with a heat insulating material made of polyethylene foam having a foaming ratio of 30 times and a thickness of 20 mm to be in close contact with the heat insulating material.
It was left to stand overnight at room temperature of 0 to 30 ° C. The obtained transparent soundproofing laminate had no peeling or the like and had high transparency and excellent performance. The evaluation results are shown in Table 1.

[0039]

[Example 2] Two transparent impact-resistant acrylic resin plates (Delagrass SR manufactured by Asahi Kasei Kogyo Co., Ltd.) having a length x width of 914 mm x 914 mm and a plate thickness of 2.5 mm and made of soft vinyl chloride having a diameter of 5 mm Using a gasket, three side edges of the peripheral edge of the resin plate, leaving one side edge, were joined with a jig to adjust the thickness of the adhesive layer to 2 mm to obtain a laminated plate.

As a polymerization adhesive, 400 g (40% by weight) of a methyl methacrylate monomer and 400 g (40% by weight) of a butyl acrylate monomer, and 200 g of a butyl acrylate polymer (equivalent to a number average molecular weight of about 1,000).
(20% by weight) and mix it with UV absorber 10
An adhesive was prepared by adding 0 ppm equivalent. After that, as a result of carrying out by the same method as in Example 1, there was no peeling or the like, and the transparency was high and the performance was excellent. The evaluation results are shown in Table 1.

[0041]

[Example 3] Two colorless and transparent biaxially stretched acrylic resin plates having a length x width of 500 mm x 500 mm and a plate thickness of 1.2 mm (a 6 mm plate of Delagrass K manufactured by Asahi Kasei Corporation was hot-pressed). Which is biaxially stretched 5 times) and a width of 6 m
Using a transparent acrylic adhesive with a thickness of 2 mm and a thickness of 2 mm,
Among the peripheral edges of the resin plate, one side was left and three sides were joined to form a laminated plate. After that, as a result of carrying out by the same method as in Example 1, there was no peeling or the like, and the transparency was high and the performance was excellent. The evaluation results are shown in Table 1.

[0042]

[Example 4] Two colorless and transparent acrylic resin plates (Delagrass A manufactured by Asahi Kasei Corporation) having a length x width of 914 mm x 914 mm and a plate thickness of 3 mm, and a width of 6 mm and a thickness of 2 mm
Using the transparent acrylic-based bonding agent described in (3) above, three side edges of the peripheral edge portion of the resin plate were bonded, leaving one side edge, to form a laminated plate. After that, as a result of carrying out in the same manner as in Example 2,
There was no peeling and the like, and the transparency was high and the performance was excellent. The evaluation results are shown in Table 1.

[0043]

Fifth Embodiment A PC sheet in which two methacrylic resin layers have an average of 100 μm in two colorless and transparent surface layers having a length × width of 300 mm × 300 mm and a plate thickness of 3 mm, and a width of 6 mm and a thickness of 2 m
Using a transparent acrylic-based bonding agent of m, three side edges of the peripheral edge of the resin plate were left and three side edges were bonded to form a laminated plate. After that, the same procedure as in Example 1 was carried out, and as a result, a transparent soundproof laminated plate was obtained. The evaluation results are shown in Table 1.

[0044]

[Comparative Example 1] The same type as that used in Example 3 but with a plate thickness of 1
The total light transmittance of a 0 mm methacrylic resin plate is 9
It was 2.6% and the haze was 0.8%. Also, -20 to
The tan δ value in the temperature range of 70 ° C. is 0.04 to 0.
It was between 07 and no peak value was observed. The evaluation results are shown in Table 1.

[0045]

Comparative Example 2 A PC sheet having a methacrylic resin layer having an average of 100 μm in the surface layer used in Example 5 had a total light transmittance of 89.1% and a haze of 1.0%. Also, −
The tan δ value in the temperature range of 20 to 70 ° C. was between 0.01 and 0.03 with no peak value. The evaluation results are shown in Table 1.

[0046]

[Table 1]

[0047]

EFFECT OF THE INVENTION The transparent sound-insulating laminate of the present invention has high transparency and excellent visibility, exhibits excellent sound-insulating performance over a wide temperature range, and has weather resistance, impact resistance, penetration resistance, anti-scattering performance, etc. It is also suitable as a material for a transparent soundproof wall for railways or roads because it is improved and the weight is reduced.

Further, according to the manufacturing method of the present invention, it is possible to prevent the occurrence of a non-uniform layer such as peeling in the adhesive layer which occurs in the manufacturing process of the transparent soundproof laminate, and the work is relatively easy even for a large product. In addition, it is also advantageous in terms of cost, and excellent effects with high practicality can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a laminated plate in which two transparent methacrylic resin plates are stacked via a soft vinyl chloride gasket.

FIG. 2 is a perspective view showing an operation of injecting a polymerization adhesive.

FIG. 3 is a cross-sectional view in which the outer surface of the laminated plate is covered with a heat insulating material.

[Explanation of symbols]

 1 Transparent Methacrylic Resin Plate 2 Soft Vinyl Chloride Gasket 3 Transparent Methacrylic Resin Plate 4 Adhesive Layer 5 Polymerization Adhesive 6 Spacer 7 Injection Needle 8 Heat Insulating Material 9 Weight

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[Procedure amendment]

[Submission date] May 13, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

Heretofore as the material of the sound barrier, mainly the inorganic materials concrete and slate plates and the like, (hereinafter referred to as PC) single polycarbonate <br/> Bone over preparative resin and single organic system such as a methacrylic resin The material is in practical use. Also,
Also in patents, for example, in Japanese Patent Publication No. 59-45509, an adhesive composition consisting of a three-component system is injected between laminated plates composed of inorganic glass, methacrylic resin, PC, etc., and polymerized and cured at room temperature for adhesion. A method for obtaining a transparent sound insulating material is described. Furthermore, JP-A-5-3186
As disclosed in Japanese Patent No. 4, between two or more acrylic resin layers,
There has been proposed a method for producing a transparent sound insulating plate by stacking acrylic syrup containing polyurethane obtained by introducing alkenyl groups at both ends by cast polymerization.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

Next, a polymerization adhesive 5 containing a certain amount of a catalyst.
As shown in FIG. 2, a fixed amount is injected from one side where the edges of the laminated plate are not joined. The amount to be injected is represented by the following formula (1). W (g) = V ( cm ³ ) × (1 + B) × D (g / cm ³ ) × 1.05 (1) (W in the formula is the injection weight of the polymerization adhesive 5 and V is the adhesion of the laminated plate. The volume of the layer 4, B is the volume shrinkage ratio of the polymer adhesive 5, D is the density of the polymer adhesive 5, and 1.05 is a coefficient for correcting the thickness variation of the adhesive layer.) When injecting the polymer adhesive 5 , The laminated plate at an angle of 10 °
It is easy to operate if it is tilted at 30 ° (work can be done easily by using a tilting table whose angle can be changed arbitrarily). If the laminate has a small size (generally, the length and width are each 30 cm or less), it is difficult to secure a space necessary for the injection amount of the polymerized adhesive 5 in the adhesive layer 4, and therefore, the bonding is performed. It is advisable not to insert the spacer 6 on one side, but also to sandwich this part with a jig, join all the edges, and press fit from the injection needle 7 at the end using a syringe or the like.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

Drop weight test: From the laminate of each example, length x width is 1
A 50 mm × 150 mm test piece was cut, held horizontally, and a 2 kg steel ball was dropped vertically from a distance of 1 m in height to make a visual determination. Environmental test: Conducted a cold heat and high humidity cycle test. The results of visual inspection after exposure under the following formula conditions are shown.

[Equation 1]

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0037

[Correction method] Change

[Correction content]

As a polymerization adhesive, 96 g (32% by weight) of a methyl methacrylate monomer and 144 g (48% by weight) of a butyl acrylate monomer and 60 g of a butyl acrylate polymer (equivalent to a number average molecular weight of about 1,000). (2
(0% by weight), and then add 100 p of UV absorber
An adhesive was prepared by adding pm equivalent. Polymerized adhesive 100
Relative to the weight part, L- ascorbate bottles acid 0.5 as a catalyst
By weight, 0.75 parts by weight of a metal complex accelerator having methyl acetoacetate as a main component and ethyl acetoacetate and vanadium, and 0.3 part by weight of cumene hydroperoxide were mixed and mixed well.

Claims (5)

[Claims] 1. A room temperature curable polymerization adhesive is interposed between at least two or more transparent methacrylic resin units or laminates, and integrated, and has a total light transmittance of 7 or less.
0 to 95%, haze value is 0.1 to 20%, and-
A transparent soundproof laminated plate having a peak value of loss tangent (tan δ) of 0.2 to 1 at 20 to 70 ° C. 2. The transparent soundproof laminate according to claim 1, wherein the methacrylic resin laminate has a polycarbonate resin as a central portion and a methacrylic resin layer as a surface layer portion. 3. The transparent soundproofing laminate according to claim 1, wherein the room-temperature-curable polymerization adhesive contains an acrylic monomer as a main component. 4. A room temperature curable polymerization adhesive is injected between at least two transparent methacrylic resin units or laminates according to any one of claims 1 to 3, and all of these outer surfaces are heat insulating materials. A method for producing a transparent sound-insulating laminate, which is characterized in that the polymerized adhesive is cured and integrated by curing. 5. A transparent soundproof wall for railways or roads according to claim 1.