JP2008285872A - Soundproof material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soundproof material which enables domestically-discharged straws, rice hulls, sawdust and wastepaper to be effectively utilized as a recycling raw material, and which can be incinerated after use. <P>SOLUTION: The raw material, in which the straws, the rice hulls, the sawdust and the wastepaper are combined together, and a solidification material such as an ethylene-vinyl acetate copolymer, an acrylic copolymerized resin emulsion or a styrene-butadiene rubber (SBR) are kneaded together in a predetermined ratio. Perlite or lightweight aggregate for mixing cement can also be combined with the raw material so as to absorb a sound. The soundproof material, which is obtained by mixing them with the solidification material, is used in the state of being molded in a required shape by being sprayed at a predetermined thickness or poured into a form. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a soundproof material.

Conventional soundproofing materials include fiber-based soundproofing materials obtained by needle punching synthetic fibers such as polyester (for example, see Patent Document 1), foamed resin-based soundproofing materials such as polyurethane foam (for example, see Patent Document 2), and the like. Are known. Since all of these soundproofing materials are manufactured from petroleum-based raw materials, they become industrial waste after use, and have a problem in that the raw materials depend on foreign countries as well as giving an environmental load.
JP 2004-84077 A JP 2006-195055 A

  The problem to be solved by the present invention is to solve these conventional problems, and to effectively use sound-proof materials that can be used effectively as recycled raw materials such as rice husks, rice husks, sawdusts, and waste papers that are discharged domestically, and that can be incinerated after use. It is to provide.

The configuration of the present invention that solves this problem is as follows.
1) Soundproof material obtained by kneading rice husk, rice husk, sawdust, waste paper, or a combination of these materials and a solidified material in a predetermined ratio 2) A combination of a predetermined amount of pearlite or cement-mixed lightweight aggregate 1) The soundproofing material 3) The raw material is a combination of straw, rice husk, sawdust and waste paper. 4) The soundproofing material according to 1) 4) The raw material is straw, rice husk, sawdust, waste paper and perlite or lightweight bone for cement. The soundproofing material according to 1) or 2), wherein the solidifying material is an ethylene vinyl acetate copolymer emulsion / acrylic copolymer resin emulsion or styrene / butadiene / rubber. Any of the soundproofing materials described above.

  According to the present invention, rice straw, rice husk, sawdust, and waste paper discharged domestically are used as recycled raw materials, so that resources can be effectively used and the raw materials do not depend on foreign countries. Moreover, since most of the raw materials are natural materials, they can be incinerated after use, reducing the burden on the environment.

  In the present invention, raw straw, rice husk, sawdust, waste paper, or combinations thereof are combined at a predetermined ratio. The raw material can be combined with a predetermined amount of pearlite or a lightweight aggregate for mixing with cement for the purpose of sound absorption. It is practical to combine the raw materials in equal volumes, but the respective raw materials may be increased or decreased depending on the purpose of use (soundproofing, heat insulation, etc.), application (wall, ceiling, floor), etc. The rice husk can be used as it is, but it is desirable that the rice husk, sawdust and waste paper be pulverized in advance so as to be about 2 to 5 mm.

  The solidifying material is for adhering raw materials to form a layer having a predetermined thickness when sprayed or to form a desired shape such as a mat. The mixing ratio is generally equal in volume to each raw material to be combined, but may be increased or decreased depending on the usage form of the soundproof material. As the solidifying material, ethylene vinyl acetate copolymer emulsion / acrylic copolymer resin emulsion or styrene / butadiene / rubber (SBR) is used. The obtained soundproofing material is used by spraying it to a predetermined thickness to form a layer, or by pouring it into a mold and forming it into a required shape. Embodiments of the present invention will be specifically described below with reference to the drawings.

  1 to 3 and Tables 1 and 2, the soundproofing material of the present invention is sprayed on the inner surface of the test room to construct a soundproof layer, and the sound generated inside the test room is measured outside the test room to measure the noise level. It is the example which tested (sound pressure level by A characteristic). FIG. 1 is a test outline diagram of the embodiment, FIG. 2 is a level recorder chart of the embodiment, and a level recorder chart of the comparative example of FIG. In the figure, 1 is a test room, 1a is a door, 2 is a soundproof layer, 3 is a sound source, 4 is a microphone, 5 is a sound level meter, and 6 is a level recorder.

  The blending ratio of the soundproof material of this example is shown in Table 1 below. An ethylene vinyl acetate copolymer emulsion was used as a solidifying material.

  As shown in FIG. 1, compared with the one in which the soundproof material 2 of this example was sprayed on the inner five surfaces except for the door 1a of the test chamber 1 having an inner size of 900 × 900 × 900 mm and the soundproof layer 2 having a thickness of about 30 mm was applied. As an example, an unconstructed one was prepared. For the test, the microphone 4 is installed at a position approximately 30 cm away from the test room 1, the sound is generated periodically from the sound source 3 in the test room 1, and the maximum indicated value of the level recorder 6 and the sound level meter 5 is set. I read it. The sound level meter 5 is NL-21 (manufactured by Lion Co., Ltd.), and the level recorder 6 is LR-20 (manufactured by Lion Co., Ltd.). The test results are shown in Table 2 below.

  A value of 47 dB (refer to the level recorder chart shown in FIG. 2) was measured for the soundproof material applied in this example, and 55 dB (refer to the level recorder chart shown in FIG. 3) was measured for the non-processed material. Thus, a difference of 8 dB was confirmed between the case where the soundproofing material was applied and the case where the soundproofing material was not applied, and it was recognized that there was a soundproofing effect. Moreover, the soundproofing material of the present invention also has a heat retaining property and can be expected as a heat insulating material.

  The soundproofing material of the present invention can be used for walls, ceilings, and floors of buildings such as gymnasiums, classrooms, general households, offices, factories, playgrounds and shooting ranges.

It is a test summary figure of an example. It is a level recorder chart of an Example. It is a level recorder chart of a comparative example.

Explanation of symbols

1 Test room 1a Door 2 Soundproof layer 3 Sound source 4 Microphone 5 Sound level meter 6 Level recorder

Claims (5)

  A soundproofing material obtained by kneading rice cake, rice husk, sawdust, waste paper, or a combination of them and a solidifying material at a predetermined ratio.   The soundproofing material according to claim 1, wherein a predetermined amount of pearlite or a lightweight aggregate for mixing cement is combined with the raw material.   The soundproof material according to claim 1, wherein the raw material is a combination of straw, rice husk, sawdust and waste paper.   The soundproofing material according to claim 1 or 2, wherein the raw material is a combination of straw, rice husk, sawdust, waste paper and pearlite or cement-mixed lightweight aggregate.   The soundproofing material according to any one of claims 1 to 4, wherein the solidifying material is ethylene vinyl acetate copolymer emulsion / acrylic copolymer resin emulsion or styrene / butadiene rubber.

Images