JPH03277539A - Noise insulating panel - Google Patents

Abstract

PURPOSE:To form a sandwich structure which is hardly deteriorated in noise insulating performance in resonance transmission in a low noise region by blending an epoxy-based cross-linking agent with resin in a specified weight ratio and constituting the core material of the expanded material which is obtained by foaming this blended material in a noise insulating panel having the sandwich structure. CONSTITUTION:In a noise insulating panel having a sandwich structure, 2 pts.wt. or less epoxy-based cross-linking agent is blended with 100 pts.wt. resin and this blended material is foamed. Its core material is constituted of the expanded material formed of the foamed high polymer material. As this thigh polymer material, urethane resin, SBR, polystyrene, polybutadiene, polyvinyl chloride, silicon rubber and acrylic resin, etc., are utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sound insulating panel used for walls and partitions.

[Conventional technology]

Walls and partitions generally have a hollow structure in which an air layer 3 is provided between two surface materials 1, as shown in FIG. 1(b).

In addition, in the instrument practice room and playing room, there is an additional
As shown in Figure (a), in order to improve the sound insulation performance, a sandwich structure is generally used in which a core material 3 made of a sound absorbing material such as glass wool or urethane resin is disposed within an air layer 3.

[Problem to be solved by the invention]

The transmission loss representing the sound insulation performance of the hollow structure is generally 125 to 200 (Hz) as shown in the graph shown by the white circle in Figure 2.
) to feel depressed.

In this example, an air layer 20 mm thick is provided between the surface plates of 12 mm thick gypsum board. The surface area of the top plate is 9
10m+nX1B20+am.

Also, in the case of a sandwich structure with a sound absorbing material such as glass wool or urethane resin as the core material, the transmission loss in the mid-to-high frequency range becomes large, as shown in the graph indicated by the black circle in Figure 2.
Transmission loss between 25 and 200 (Hz) is not significantly improved.

In this example, a core material of glass wool with a thickness of 20 mm is provided between the surface plates of a gypsum board with a thickness of 12 mm. The surface area of the top plate is 910×18201I11.

This drop in the bass range is a phenomenon called resonance transmission in the bass range, and is improved by increasing the loss coefficient of the core material, but it cannot be improved with glass wool or urethane resin because the loss coefficient is small.

In addition, although Figure 2 shows the sound insulation, etc. section regarding the average sound pressure level difference between rooms, which is specified in JIS A1419, the sound insulation performance of walls is almost directly reflected in the average sound pressure level difference between snow. Therefore, it can be seen that this drop in the bass pair is a problem.

The present invention has been made in view of the above reasons, and its object is to provide a sound insulating panel with a sandwich structure in which there is less depression due to resonance transmission in the low frequency range.

[Means to solve the problem]

The sound insulation panel of the present invention is a sound insulation panel having a sandwich structure, and the core material is a foamed polymer material made by combining 2 parts by weight or less of an epoxy crosslinking agent with 1 part by weight of resin. This is what I did.

As such polymer materials, urethane resin, SBR, polystyrene, polybutadiene, vinyl chloride, silicone rubber, acrylic resin, etc. are used.

[For production]

With the above configuration, the present invention uses a core material with a large loss coefficient, resulting in a sound insulation panel with a sandwich structure in which the sound insulation performance decreases less in resonance transmission in the low frequency range.

〔Example〕

Examples of the present invention will be described below.

The structure of the sound insulating panel of the following example is the same as that shown in FIG. 1(a), and the surface plate is a gypsum board with a thickness of 12 m+ and a surface area of 910 m+X1B20 mm, and the thickness of the core material is 20 mm.

Examples belonging to the first category include a sound insulation panel using an acrylic resin foam material in which 2 parts by weight of an epoxy cross-linking agent is added to 100 parts by weight of acrylic resin as a core material (Example 1); This is a sound insulation panel (Example 2) whose core material is a foamed acrylic resin with no additives added. Table 1 shows the specifications and characteristics of the core material.

In addition, as a comparative example, a sound insulation panel using an acrylic resin foam material as a core material in which 6 parts by weight of an epoxy crosslinking agent was added to 100 parts by weight of resin, which is the usual blending ratio, was prepared.
The specifications and characteristics of Comparative Example 1) and a sound insulation panel using glass wool as a core material (Comparative Example 2) are also shown.

Here, the amount of improvement in transmission loss in resonance transmission in the bass range is the amount of reduction in transmission loss in the resonance transmission frequency in the bass range relative to the mass side when glass wool is used as the core material, when each foam material is used as the core material. This is the amount of improvement in the amount of decline.

Note that the drop amount TLo" of the transmission loss at the resonant transmission frequency in the bass range can be obtained using the loss coefficient η as 1+η2 TLo = 10X]og η2.

By reducing the amount of crosslinking agent relative to 100 parts by weight of the resin, the loss coefficient becomes larger and the transmission loss is improved.

Example 3.4 and its comparative example 3, which belong to the second class, have the following specifications in the specifications of example 1.2 and its comparative example 3, which belong to the first class.
A core material was formed by adding 50 parts by weight of gold mica having an average particle size of 1.4 (mm) and an aspect ratio of 90 to 100 parts by weight of resin, and changing the expansion ratio. Its specifications and characteristics are shown in Table 2.

In the case of this example as well, by reducing the amount of crosslinking agent, the loss coefficient increases and the transmission loss is improved.

Note that the resin and additives are not limited to acrylic resin and gold mica, respectively.

Other additives that may be used include talc, pyrophyllite, chlorite, montmorillonite, kaolin, hallosite, and the like.

Furthermore, as the loss coefficient increases, the drop in transmission loss due to bending vibration of the top plate in the high frequency range also decreases.

〔Effect of the invention〕

The present invention provides a sound insulation panel with a sandwich structure, in which the core material is a foamed polymer material that is foamed by adding 2 parts by weight or less of an epoxy crosslinking agent to 100 parts by weight of resin. It is possible to provide a sound insulation panel with less drop in sound insulation performance in resonance transmission.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the sound insulation panel, where (a) shows a sandwich structure, and (a) shows a hollow structure. FIG. 2 is a graph of frequency characteristics of sound insulation performance according to a conventional example.

Claims (1)

[Claims] (1) In a sound insulation panel with a sandwich structure consisting of two face plates and a core material, the core material is made of a polymer material foamed by blending 2 parts by weight or less of an epoxy crosslinking agent to 100 parts by weight of resin. A sound insulation panel characterized by being made of foam material.