JP4906772B2 - Soundproof material - Google Patents

Description

  The present invention relates to a soundproof material to be constructed on a floor, wall, or ceiling of a building.

Examples of 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 that the environment is burdened and the raw materials also depend on foreign countries.
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 provide a soundproofing material that can effectively utilize rice husks and kelp stems discharged in the country as recycled raw materials and can be incinerated after use. There is.

The configuration of the present invention that solves this problem is as follows.
1) A rice husk extract obtained by boiling rice husk into water, a kelp solution obtained by dissolving kelp stem powder in water, an adhesive, and cement were mixed at a predetermined ratio. Soundproofing material 2) Rice husk extract is obtained by adding 20-30% by volume of rice husk to 100% by volume of water and boiling, and kelp liquid is powder of kelp stalk with respect to 100% by volume of water. The soundproofing material described in 1) above, wherein the mixing ratio of rice husk extract, kelp, adhesive, and cement is 2: 2: 1: 1. The soundproof material according to 1) or 2) above, wherein the adhesive is one of ethylene vinyl acetate emulsion / acrylic emulsion or styrene / butadiene rubber, or 1) to 3) above. In soundproof material.

  According to the present invention, rice husks and kelp stems 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. Moreover, since the component contained in the raw material has flame retardancy, the flame does not rise from the construction surface during a fire and is difficult to burn.

  In the present invention, rice husk can be used as it is, but it may be finely pulverized in advance to facilitate extraction of components. The input amount is practically in the range of 20-30% by volume with respect to 100% by volume of water. As kelp, those belonging to the genus of the kombu such as macomb, onicomb, resilib, mitsuishi kombu, nagacombu, hosome kombu, etc. are used, and a stalk that has no commercial value or is not used for food is used. The stem is dried to a powder, and 10 to 20% by volume is added to 100% by volume of water and dissolved.

  The adhesive is for attaching the raw material to the construction surface. The adhesive is selected from ethylene vinyl acetate emulsion / acrylic emulsion or styrene / butadiene rubber (SBR) and diluted with water. The mixing ratio of adhesive: water is practically 1: 3 to 1: 4. Cement becomes a solid content in the raw material to form a soundproof layer having a predetermined thickness on the construction surface.

  In addition, sawdust, pulp and the like can be mixed into these raw materials as an extender. The mixing ratio of rice husk extract, kelp, adhesive, and cement is practically 2: 2: 1: 1, but it may increase or decrease depending on the application (wall / ceiling / floor) and the condition of the groundwork. May be. In addition, white paint may be sprayed to a thickness of 1 to 3 mm on the construction surface of the soundproof material at a place that is felt dark after construction, such as a classroom. 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 acrylic emulsion was used as an adhesive. The rice husk extract used was obtained by boiling 500 g of rice husk in 6 L of water. The kelp solution used was obtained by drying a kelp stalk into a powder and adding 360 g of the powder in 20 to 25 L of water to dissolve it. Cement was used in an amount of 800 g to 1 kg.

  As shown in FIG. 1, the soundproofing material 2 of this embodiment was sprayed on the inner five surfaces except the door 1a of the test chamber 1 having an inner size of 900 × 900 × 900 mm to construct a soundproofing layer 2 having a thickness of about 25 to 50 mm. As a comparative example, an unconstructed one was prepared. For the test, the microphone 4 was installed at a position approximately 30 cm away from the test chamber 1, sound was periodically generated in the test chamber 1, and the maximum indicated values of the sound level meter 5 and the level recorder 6 were read. 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.

  The use of the soundproofing material of the present invention can be applied to walls, ceilings and floors of buildings such as parking lots, gymnasiums, classrooms, general households, offices, factories, amusement parks, stores, shooting ranges and the like.

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 (4)

  A soundproof material in which rice husk extract obtained by boiling rice husk into water, kelp liquid obtained by dissolving kelp stem powder in water, adhesive, and cement are mixed at a predetermined ratio. .   The rice husk extract was obtained by adding 20-30% by volume of rice husk to 100% by volume of water and boiling, and the kelp solution was 10-20% of kelp stalk powder with respect to 100% by volume of water. The soundproofing material according to claim 1, wherein the soundproofing material is obtained by dissolving by volume introduction.   The soundproofing material according to claim 1 or 2, wherein a mixing ratio of rice husk extract, kelp, adhesive, and cement is 2: 2: 1: 1.   The soundproof material according to any one of claims 1 to 3, wherein the adhesive is one of ethylene vinyl acetate emulsion / acrylic emulsion or styrene / butadiene rubber.

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