JPWO2014126252A1 - Laminated glass and mounting structure to which the glass is mounted - Google Patents

Abstract

The present invention provides a laminated glass capable of maintaining sound insulation even with further weight reduction, and a mounting structure to which the laminated glass is attached. A laminated glass according to the present invention is sandwiched between a first glass plate, a second glass plate disposed opposite to the first glass plate, and the first glass plate and the second glass plate. An intermediate film, wherein the sum of the thickness of the first glass plate and the thickness of the second glass plate is 2.4 to 3.8 mm, and the Young's modulus of the intermediate film has a frequency of 100 Hz and a temperature of 20 ° C. In, it is 100-1000 MPa.

Description

  The present invention relates to a laminated glass used for a windshield of an automobile and a mounting structure to which the laminated glass is mounted.

Conventional technology

  Glass for automobiles is required to have sound insulation performance in order to cut off engine sounds of automobiles and sounds generated during driving. In this regard, for example, Patent Document 1 describes that the sound insulation performance is affected by the surface density. That is, in order to improve the sound insulation performance, it is necessary to increase the thickness of the glass. On the other hand, from the viewpoint of improving the fuel efficiency of automobiles, the glass is required to be lighter. For this reason, it is desirable that the glass has a smaller thickness. Therefore, conventionally, in order to satisfy these two contradictory performances, a laminated glass having a sum of the thicknesses of the glass on the vehicle outside and the vehicle inside of about 4 mm is used.

JP 2002-326847 A

  By the way, from the ecological point of view in recent years, the demand for reducing the weight of glass has become stronger. However, if the weight is further reduced, the sound insulation performance will be reduced, so both the weight reduction and the improvement of the sound insulation are combined. Laminated glass still had room for improvement. Such a problem is a problem that can occur not only in automobile glass but also in laminated glass that requires weight reduction and sound insulation.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a laminated glass capable of maintaining sound insulation even with further weight reduction, and a mounting structure to which the laminated glass is attached.

  The laminated glass according to the present invention includes a first glass plate, a second glass disposed opposite to the first glass plate, and an intermediate film sandwiched between the first glass and the second glass. The sum of the thickness of the first glass plate and the thickness of the second glass plate is 2.4 to 3.8 mm, and the Young's modulus of the intermediate film is 100 to 1000 MPa at a frequency of 100 Hz and a temperature of 20 ° C. .

  In the laminated glass, the sum of the thickness of the first glass plate and the thickness of the second glass plate can be 2.6 to 3.4 mm.

  In the laminated glass, the thickness of the first glass plate can be made larger than the thickness of the second glass plate.

  At this time, the thickness of the first glass plate can be 1.8 to 5.0 mm. The thickness of the second glass plate can be 0.6 to 5.0 mm.

  In the laminated glass, the tan δ of the intermediate film can be set to 0.1 to 3.0 at a frequency of 100 Hz and a temperature of 20 ° C.

  In the said laminated glass, the thickness of the said intermediate film can be 0.5-5.0 mm.

  Moreover, the laminated glass attachment structure according to the present invention includes any one of the laminated glasses described above and an attachment portion for attaching the laminated glass to a vertical attachment angle of 45 degrees or less. Such an attachment structure is, for example, an automobile or a building, and the attachment portion is a frame or the like for attaching laminated glass. Moreover, a laminated glass can be attached with a well-known method with respect to an attaching part.

  According to the present invention, the sound insulation can be maintained even by further weight reduction.

It is sectional drawing which shows one Embodiment of the laminated glass which concerns on this invention. It is the front view (a) and sectional view (b) which show the amount of doubles of a curved laminated glass. It is a graph which shows the relationship between the general frequency and sound transmission loss of a curved glass plate and a planar glass plate. It is a schematic plan view which shows the measurement position of the thickness of a laminated glass. It is a graph which shows the relationship between the frequency and sound transmission loss in the conventional laminated glass. It is a graph which shows the relationship between the frequency and sound transmission loss in the conventional laminated glass. It is a graph which shows the result of the simulation regarding a Young's modulus and the total thickness of a glass plate. It is the schematic which shows the attachment method of a laminated glass. It is a graph which shows the result of evaluation of an outside glass board. It is a model figure of the simulation for outputting sound transmission loss. It is a graph which shows the result of evaluation about the thickness of an interlayer film. It is a graph which shows the result of evaluation about the thickness of an interlayer film. It is a graph which shows the result of evaluation about the thickness of an interlayer film. It is a graph which shows the result of evaluation about the thickness of an interlayer film. It is a graph which shows the result of evaluation about the thickness of an interlayer film. It is a graph which shows the result of evaluation about the total thickness of a glass plate. It is a graph which shows the result of evaluation about the attachment angle of a laminated glass.

1 Outer glass plate (first glass plate)
2 Inside glass plate (second glass plate)
3 interlayer film

DETAILED DESCRIPTION OF THE INVENTION

  Hereinafter, an embodiment of a laminated glass according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a laminated glass according to the present embodiment. As shown in the figure, the laminated glass according to this embodiment includes an outer glass plate (first glass plate) 1, an inner glass plate (second glass plate) 2, and an intermediate film 3 sandwiched between these glass plates. It consists of The outer glass 1 is a glass plate disposed on the side susceptible to disturbance, and the inner glass 2 is a glass plate disposed on the opposite side. Therefore, for example, when this laminated glass is used as a glass of an automobile, the glass plate on the outside of the vehicle becomes an outer glass plate, and when used as a building material, the side facing outward becomes an outer glass plate. However, depending on the disturbance that can be received, the arrangement may be opposite. Hereinafter, each member will be described.

<1. Outer glass plate and inner glass plate>
As the outer glass plate 1 and the inner glass plate 2, known glass plates can be used, and they can be formed of heat ray absorbing glass, general clear glass, green glass, or UV green glass. However, when this laminated glass is used for an automobile window, it is necessary to realize a visible light transmittance in accordance with the safety standard of the country where the automobile is used. For example, the required solar radiation absorption rate can be secured by the outer glass plate 1, and the visible light transmittance can be adjusted by the inner glass plate 2 so as to satisfy the safety standard. Below, an example of a composition of clear glass and an example of a composition of heat ray absorption glass are shown.

(Clear glass)
SiO ₂ : 70 to 73% by mass
Al ₂ O ₃ : 0.6 to 2.4% by mass
CaO: 7 to 12% by mass
MgO: 1.0 to 4.5 mass%
R ₂ O: 13 to 15% by mass (R is an alkali metal)
Fe total iron oxide in terms of _{2 O 3 (T-Fe 2} O 3): 0.08~0.14 wt%

(Heat ray absorbing glass)
The composition of the heat-absorbing glass, for example, based on the composition of the clear glass, the proportion of the total iron oxide in terms of _{Fe 2 O 3 (T-Fe} 2 O 3) and 0.4 to 1.3 wt%, CeO ₂ ratio as 0-2 mass%, the proportion of TiO ₂ and 0 to 0.5 wt%, framework component of the glass (mainly, SiO ₂ and Al ₂ O ₃₎ to T-Fe ₂ O _3, CeO _The composition can be reduced by an increase of ₂ and TiO ₂ .

  In general, the total thickness of the outer glass plate and the inner glass plate that achieves both weight reduction and sound insulation is about 4.0 mm. However, in the laminated glass according to the present embodiment, the purpose is to reduce the weight. The total thickness of the outer glass plate 1 and the inner glass plate 2 is preferably 2.4 to 3.8 mm, more preferably 2.6 to 3.4 mm, and 2.7 to 3.2 mm. It is particularly preferred that Thus, since it is necessary to reduce the total thickness of the outer glass plate 1 and the inner glass plate 2 for weight reduction, the thickness of each glass plate is not particularly limited, For example, the thickness of the outer glass plate 1 and the inner glass plate 2 can be determined as follows.

  The outer glass plate 1 mainly needs durability and impact resistance against external obstacles. For example, when this laminated glass is used as a windshield of an automobile, the outer glass plate 1 has impact resistance performance against flying objects such as pebbles. is necessary. On the other hand, as the thickness increases, the weight increases. From this viewpoint, the thickness of the outer glass plate 1 is preferably 1.8 mm or more, 1.9 mm or more, 2.0 mm or more, 2.1 mm or more, or 2.2 mm or more. On the other hand, the upper limit of the thickness of the outer glass is preferably 5.0 mm or less, 4.0 mm or less, 3.1 mm or less, 2.5 mm or less, 2.4 mm or less. Among them, it is preferably larger than 2.1 mm and 2.5 mm or less, particularly preferably 2.2 mm or more and 2.4 mm or less. Which thickness is adopted can be determined according to the application of the glass.

  When prescribing the thickness of the outer glass plate 1 as described above, the inner glass plate 2 is preferably made thinner than the outer glass plate 1 in order to reduce the weight of the laminated glass. Specifically, considering the strength of the glass, the thickness of the inner glass plate 2 is preferably in the order of 0.6 mm or more, 0.8 mm or more, 1.0 mm or more, and 1.3 mm or more. On the other hand, the upper limit of the thickness of the inner glass plate 2 is 5.0 mm or less, 4.0 mm or less, 3.1 mm or less, 2.5 m or less, 2.0 mm or less, 1.6 mm or less, 1.4 mm or less, 1.3 mm. Hereinafter, it is preferable in the order of less than 1.1 mm. Among these, for example, 0.6 mm or more and less than 1.1 mm, or greater than 2.1 mm and 2.5 mm or less, and particularly preferably 2.2 mm or more and 2.4 mm or less. Which thickness is used for the inner glass plate 2 can also be determined according to the purpose of the glass.

  Further, the shape of the outer glass plate 1 and the inner glass plate 2 according to the present embodiment may be either a planar shape or a curved shape. However, since the sound transmission loss (STL) of the glass described later is lower in the curved shape, the curved glass particularly requires an acoustic measure. The reason why the STL value is lower in the curved shape than in the planar shape is that the curved shape is more influenced by resonance.

  Furthermore, when the glass has a curved shape, the sound insulation performance decreases when the amount of double is increased. The double amount is an amount indicating the bending of the glass plate. For example, when a straight line L connecting the center of the upper side and the center of the lower side is set as shown in FIG. The largest distance between the two is defined as a double amount D.

  FIG. 3 is a graph showing a relationship between a general frequency and sound transmission loss of a curved glass plate and a planar glass plate. According to FIG. 3, the curved glass plate has no significant difference in sound transmission loss in the range of the doubly amount of 30 to 38 mm, but the sound transmission is in a frequency band of 4000 Hz or less compared to the planar glass plate. It can be seen that the loss is decreasing. Therefore, when producing a curved glass plate, the amount of double is better, but for example, when the amount of double exceeds 30 mm, the Young's modulus of the core layer of the intermediate film is set to 18 MPa (frequency) as will be described later. 100 Hz, temperature 20 ° C.) or less.

  Here, an example of a method for measuring the thickness when the glass plate is curved will be described. First, about a measurement position, as shown in FIG. 4, it is two places up and down on the center line S extended in the up-down direction at the center of the left-right direction of a glass plate. The measuring instrument is not particularly limited, and for example, a thickness gauge such as SM-112 manufactured by Teclock Co., Ltd. can be used. At the time of measurement, it is arranged so that the curved surface of the glass plate is placed on a flat surface, and the end of the glass plate is sandwiched by the thickness gauge and measured. Even when the glass plate is flat, it can be measured in the same manner as when the glass plate is curved.

<2. Interlayer>
As described above, when the total thickness of the outer glass plate 1 and the inner glass plate 2 is reduced, there is a general concern that the sound insulation performance is lowered. In this regard, the present inventor is as follows. It was examined.

  First, it is generally said that the frequency of sounds that humans can easily hear is 2000 to 5000 Hz. In general, it is also known that laminated glass having a thickness of about 4.0 mm has a reduced sound insulation performance in the frequency range of 2000 to 5000 Hz due to the coincidence effect. FIG. 5 is a graph showing the results of simulating the relationship between the frequency and sound transmission loss (SLT) in laminated glass having an outer glass plate and an inner glass plate each having a thickness of 2.0 mm. According to this graph, it can be seen that the sound transmission loss is reduced in a frequency range of 2000 to 5000 Hz that is easy for humans to hear.

When this point is further examined, it is generally known that when the thickness of the glass is reduced, the coincidence frequency is shifted to the high frequency side as shown in the following equation (1).

  FIG. 6 is a graph showing the relationship between the frequency and sound transmission loss (STL) of a laminated glass using an interlayer film having a relatively low Young's modulus. As shown in the figure, when comparing the STL of the first laminated glass whose outer glass plate and the inner glass plate are both 2 mm and the STL of the second laminated glass whose outer glass plate is 2 mm and whose inner glass plate is 1.5 mm, It can be seen that the coincidence frequency of the second laminated glass having a small total thickness is shifted to a higher frequency side than the first laminated glass. Furthermore, since the surface density is reduced by reducing the total thickness, the STL is also reduced.

  However, when the present inventor uses the intermediate film 3 having a Young's modulus of 100 MPa or more at a frequency of 100 Hz and a temperature of 20 ° C., the acoustic wave is reduced in the above-described frequency range of 2000 to 5000 Hz even if the total thickness of the glass plate is reduced. It has been found that the transmission loss is improved over the laminated glass having a large total thickness. FIG. 7 shows a third laminated glass STL in which the outer glass plate and the inner glass plate are both 2 mm and the outer glass plate are 2 mm when the intermediate film 3 having a Young's modulus of 100 MPa is used at a frequency of 100 Hz and a temperature of 20 ° C. The inner glass plate is a graph showing the STL of the fourth laminated glass having a thickness of 1.0 mm. According to the figure, although the thickness of the inner glass plate 2 is reduced to 1.0 mm as in the case of the fourth laminated glass, the coincidence frequency shifts to the high frequency side as compared with the third laminated glass having a large total thickness. It has been found that in the above frequency region, sound transmission loss hardly decreases, but rather an improved region is generated, and sound insulation performance is improved.

  From the above viewpoint, the total thickness of the laminated glass and the thicknesses of the glass plates 1 and 2 are defined as described above, and the intermediate film 3 can be selected based on the Young's modulus. Specifically, it is preferably 100 to 1000 MPa, more preferably 200 to 1000 MPa at a frequency of 100 Hz and a temperature of 20 degrees. Furthermore, 400-1000 MPa is preferable. As will be described later, if the Young's modulus is too small, the coincidence frequency does not increase in the above-described frequency region. On the other hand, if the Young's modulus is too large, the impact resistance performance decreases, which is not preferable. As a measuring method, for example, frequency dispersion measurement can be performed with a strain amount of 0.05% using a solid viscoelasticity measuring apparatus DMA 50 manufactured by Metravib. Hereinafter, unless otherwise specified, in this specification, the Young's modulus is a value measured by the above method. However, when the Young's modulus is 200 MPa or less, an actual measurement value is used. When the Young's modulus is greater than 200 MPa, a calculated value based on the actual measurement value is used. The calculated value is based on a master curve calculated by using the WLF method from the actually measured value.

  Further, the tan δ of the intermediate film is preferably 0.1 to 3.0, more preferably 0.1 to 1.0, and more preferably 0.2 to 0.4 at a frequency of 100 Hz and a temperature of 20 ° C. It is particularly preferred that When tan δ is in the above range, sound is easily absorbed, and sound insulation performance is improved. However, if tan δ becomes too large, the intermediate film 3 becomes too soft and difficult to handle. On the other hand, if the thickness is too small, the intermediate film 3 becomes too hard, and the impact resistance performance is deteriorated.

  Although the material which comprises the intermediate film 3 is not specifically limited, It is required that it is a material which can make Young's modulus into the above ranges at least. For example, it can be composed of polyvinyl butyral resin (PVB). Polyvinyl butyral resin is preferable because it is excellent in adhesiveness and penetration resistance with each glass plate.

  In general, the hardness of the polyvinyl acetal resin is controlled by (a) the degree of polymerization of the starting polyvinyl alcohol, (b) the degree of acetalization, (c) the type of plasticizer, (d) the addition ratio of the plasticizer, etc. Can do. Therefore, a hard polyvinyl butyral resin can be produced by appropriately adjusting at least one selected from these conditions. Furthermore, the hardness of the polyvinyl acetal resin can also be controlled by the type of aldehyde used for acetalization, coacetalization with a plurality of aldehydes or pure acetalization with a single aldehyde. Although it cannot generally be said, the polyvinyl acetal resin obtained by using an aldehyde having a large number of carbon atoms tends to be softer. In addition, when predetermined Young's modulus is obtained, it is not limited to the said resin etc., Other additives can also be mix | blended as needed.

  Moreover, the intermediate film 3 is preferably, for example, 0.5 to 5.0 mm, and more preferably 0.6 to 3.0 mm. When the intermediate film 3 becomes too small, the sound insulation performance may be lowered, or the penetration resistance may be lowered. On the other hand, if it becomes too large, it leads to cost increase, which is not preferable. The intermediate film 3 can be formed of a single layer, but can also be configured by stacking layers made of the same material. When layers of the same material are stacked, a film may be sandwiched between the layers. In this case, the thickness of the intermediate film refers to the sum of the layers of the intermediate film excluding the film.

  Note that the thickness of the intermediate film 3 does not have to be constant over the entire surface, and may be a wedge shape for laminated glass used for a head-up display, for example. In this case, the thickness of the intermediate film 3 is measured at the thinnest portion, that is, the lowermost side portion of the laminated glass. When the intermediate film 3 is wedge-shaped, the outer glass plate and the inner glass plate are not arranged in parallel, but such an arrangement is also included in the “opposing arrangement” between the outer glass plate and the inner glass plate in the present invention. . That is, the “opposing arrangement” of the present invention includes an arrangement of the outer glass plate 1 and the inner glass plate 2 when the intermediate film 3 whose thickness is widened at a change rate of 3 mm or less per 1 m, for example.

<3. Manufacturing method of laminated glass>
The manufacturing method of the laminated glass which concerns on this embodiment is not specifically limited, The manufacturing method of a conventionally well-known laminated glass is employable. For example, first, the intermediate film 3 is sandwiched between the outer glass plate 1 and the inner glass plate 2, put in a rubber bag, and pre-bonded at about 70 to 110 ° C. while sucking under reduced pressure. Other pre-adhesion methods are possible. For example, the intermediate film 3 is sandwiched between the outer glass plate 1 and the inner glass plate 2 and heated at 45 to 65 ° C. by an oven. Subsequently, this laminated glass is pressed by a roll at 0.45 to 0.55 MPa. Next, this laminated glass is again heated at 80 to 105 ° C. by an oven and then pressed again by a roll at 0.45 to 0.55 MPa. Thus, preliminary adhesion is completed.

  Next, this adhesion is performed. The laminated glass on which the preliminary adhesion has been made is subjected to main adhesion at 100 to 150 ° C. at 8 to 15 atm by an autoclave. Specifically, the main bonding can be performed under the conditions of 14 atm and 145 ° C. Thus, the laminated glass according to the present embodiment is manufactured.

<4. Laminated glass mounting structure>
The laminated glass mentioned above can be attached to attachment structures, such as a car and a building, for example. At this time, the laminated glass is attached to the attachment structure via the attachment portion. The attachment portion corresponds to, for example, a frame such as a urethane frame for attachment to an automobile, an adhesive, a clamp, or the like. As an example of attachment to an automobile, as shown in FIG. 8A, first, pins 50 are attached to both ends of the laminated glass 10, and an adhesive 60 is applied to the automobile frame 70 to be attached. . A through hole 80 into which a pin is inserted is formed in the frame. And the laminated glass 10 is attached to the flame | frame 70 as shown in FIG.8 (b). First, the pin 50 is inserted into the through hole 80 and the laminated glass 10 is temporarily fixed to the frame 70. At this time, since a step is formed in the pin 50, the pin 50 is inserted only halfway through the through-hole 80, whereby a gap is generated between the frame 70 and the laminated glass 10. And since the adhesive material 60 mentioned above is apply | coated to this clearance gap, the laminated glass 10 and the flame | frame 70 are fixed via the adhesive material 60 with progress of time.

  In the attachment of the laminated glass to the attachment structure, the attachment angle of the laminated glass 10 is preferably 45 degrees or less from the vertical N as shown in FIG.

<5. Features>
According to this embodiment, since the Young's modulus of the intermediate film 3 is 100 to 1000 MPa at a frequency of 100 Hz and a temperature of 20 ° C., the total thickness is reduced even if the total thickness of the outer glass plate 1 and the inner glass plate 2 is reduced. Compared with a large laminated glass, sound transmission loss in the frequency region of 2000 to 5000 Hz can be improved. As a result, it is possible to reduce the weight of the laminated glass, and it is possible to prevent the sound insulation performance that is a concern from being lowered in a frequency range that is easy for humans to hear.

  Examples of the present invention will be described below. However, the present invention is not limited to the following examples.

<1. Evaluation of thickness of outer glass plate>
First, the thickness of the outer glass plate was evaluated. Here, the following seven laminated glasses were prepared. Each laminated glass includes an outer glass plate, an inner glass plate, and an intermediate film sandwiched between them. The thickness of the interlayer film was 0.76 mm, the frequency was 100 Hz, and the Young's modulus at a temperature of 20 ° C. was 100 MPa.

  Each of the laminated glasses was arranged at an angle of 60 degrees from the vertical, and granite having an average particle diameter of about 10 mm was collided with each laminated glass at a speed of 64 km / h. Thirty granites collided with each laminated glass, and the occurrence rate of cracks was calculated. The result is as shown in FIG. As shown in the figure, in the laminated glasses 1 to 5 having an outer glass plate thickness of 2.1 mm, the occurrence rate of cracks was 5% or less regardless of the thickness of the inner glass plate. On the other hand, in the laminated glasses 6 and 7 having a thickness of the outer glass plate of 1.8 mm or less, the occurrence rate of cracks was 8% regardless of the thickness of the inner glass. Therefore, from the viewpoint of impact resistance against flying objects, the thickness of the outer glass plate is preferably larger than 1.8 mm as described above. More preferably, it is 2.0 mm or more.

<2. Evaluation of Young's modulus of interlayer film>
The laminated glass which concerns on an Example and a comparative example was prepared as follows, changing the thickness of each glass plate, and the Young's modulus of an intermediate film. Each glass plate was formed of the above-described clear glass. The thickness of the interlayer film was 0.76 mm. The thickness of the interlayer film is measured at a frequency of 100 Hz and a temperature of 20 ° C. This condition is the same in the following description.

  About the said Example and comparative example, the sound transmission loss was evaluated by simulation. The simulation conditions are as follows.

First, the simulation was performed using acoustic analysis software (ACTRAN, manufactured by Free Field technology). In this software, the sound transmission loss (transmitted sound pressure level / incident sound pressure level) of the laminated glass can be calculated by solving the following wave equation using the finite element method.

Next, calculation conditions will be described.
(1) Model setting The laminated glass model used in this simulation is shown in FIG. In this model, a laminated glass is defined in which an outer glass plate, an intermediate film, an inner glass plate, and a urethane frame are laminated in this order from the sound source side. Here, the reason why the urethane frame is added to the model is that there is a considerable influence on the calculation result of sound transmission loss due to the presence or absence of the urethane frame, and between the laminated glass and the vehicle windshield. This is because it is generally considered that a urethane frame is used and bonded.
(2) Input condition 1 (dimensions, etc.)

  The size of the glass plate, 800 × 500 mm, is smaller than the size used in an actual vehicle. As the glass size increases, the STL value tends to deteriorate. This is because the larger the size, the larger the constrained portion and the greater the amplitude. However, even if the glass size is different, the tendency of the relative value for each frequency described above is the same.

Random diffused sound waves are sound waves that are transmitted with sound waves of a predetermined frequency with respect to the outer glass plate at angles of incidence in all directions, assuming a sound source in a reverberation chamber that measures sound transmission loss. It has become.
(3) Input condition 2 (property value)
[About Young's modulus and loss factor of interlayer film]
Different values were used for each main frequency. This is because the interlayer is a viscoelastic body, and the Young's modulus is strongly frequency dependent due to the viscous effect. In addition, although the temperature dependence is large, the physical property value which assumed temperature constant (20 degreeC) was used this time.
The above simulation method is the same in the following items 3 and 4.

  The results are as shown in the graphs of FIGS. According to FIGS. 11-13, even if the thickness of an inner side glass plate is small, compared with Comparative Examples 3-5, Examples 1-3 have high sound insulation performance in the frequency range of 2000-5000 Hz which is easy to hear each. An area that appears. Further, as shown in FIGS. 14 and 15, if the thickness of the inner glass plate is reduced as in Comparative Examples 1 and 2, a region where the sound transmission loss is higher than that in Comparative Examples 6 and 7 is generated. It can be seen that the region is a region of 5000 Hz or more and is out of the frequency range that is easy for humans to hear. This is considered due to the fact that the Young's modulus of the interlayer film is smaller than 100 MPa. Therefore, it was found that even if the total thickness of the glass plate is reduced, if the Young's modulus of the interlayer film is 100 MPa or more, a region where the sound insulation performance in the frequency range of 2000 to 5000 Hz that is easy for humans to hear appears.

<3. Evaluation on total thickness of glass plate>
The laminated glass which concerns on an Example and a comparative example was prepared as follows. Here, the thickness of the inner glass plate was changed, and the sound transmission loss was calculated by the simulation method. The thickness of the interlayer film was 0.76 mm, and all the Young's moduli were 100 MPa.

  The results are as shown in the graph of FIG. According to this result, Examples 4-11 are in the frequency range of 2000-5000 Hz, although the total thickness of a glass plate is smaller than the laminated glass whose total thickness of Comparative Example 8 is 4.0 mm. A region with high sound transmission loss appears. This result was the same even when the thickness of both glass plates was the same as in Example 10. Therefore, it can be seen that when the total thickness of the glass plate is 3.8 mm or less, an area where the sound insulation performance in the frequency range of 2000 to 5000 Hz, which is easy for humans to hear, is higher than that of a general laminated glass of 4.0 mm. It was. That is, it was found that the sound insulation performance as a whole does not deteriorate even when the total thickness of the glass plate is reduced.

<4. Evaluation of the mounting angle of laminated glass>
Subsequently, the mounting angle of the laminated glass was evaluated by a simulation in which the incident angle of sound was changed. Here, the sound transmission loss was calculated by changing the angle from the vertical to 0 to 75 degrees. Each glass plate was formed of the above-described clear glass. The thickness of the interlayer film was 0.76 mm, and the Young's modulus was 100 MPa. Moreover, the thickness of the outer side glass plate and the inner side glass plate was 2.0 mm and 1.0 mm, respectively.

  About the said Example and comparative example, the sound transmission loss was evaluated with the said simulation method. However, a simulation was performed by adding a laminated glass mounting angle as an input condition. The results are as shown in FIG. According to the figure, it can be seen that when the mounting angle exceeds 60 degrees, the sound transmission loss sharply decreases at a frequency near 3000 Hz. Therefore, it was found that the mounting angle from the vertical of the laminated glass is preferably 45 degrees or less in order to improve the sound insulation performance in the frequency range of 2000 to 5000 Hz that is easy for humans to hear. Moreover, if it is 60 degrees or less, sound insulation performance can be improved, and sound insulation performance can be improved by setting it as 75 degrees or less depending on the case.

Claims (7)

A first glass plate;
A second glass plate disposed opposite to the first glass plate;
An intermediate film sandwiched between the first glass plate and the second glass plate;
With
The sum of the thickness of the first glass plate and the thickness of the second glass plate is 2.4 to 3.8 mm,
The interlayer has a Young's modulus of 100 to 1000 MPa at a frequency of 100 Hz and a temperature of 20 ° C.   The laminated glass of Claim 1 whose sum of the thickness of a said 1st glass plate and the thickness of a said 2nd glass is 2.6-3.4 mm.   The laminated glass according to claim 1 or 2, wherein a thickness of the first glass plate is larger than a thickness of the second glass plate.   The laminated glass of Claim 3 whose thickness of a said 1st glass plate is 1.8 mm-5.0 mm.   The laminated glass of Claim 3 or 4 whose thickness of a said 2nd glass plate is 0.6-5.0 mm.   The laminated glass in any one of Claim 1 to 5 whose thickness of the said intermediate film is 0.5 mm-5.0 mm. The laminated glass according to any one of claims 1 to 6,
An attachment structure for laminated glass, comprising: an attachment portion for attaching the laminated glass to a vertical attachment angle of 45 degrees or less.