KR101887862B1 - Absorbing material containing cinder ash and method for manufacturing using the same - Google Patents

Abstract

The present invention relates to a sound absorbing material including a soft material and a method of manufacturing the same, and more particularly, to a sound absorbing plate including a sound absorbing material having an excellent sound absorbing ratio by mixing soft materials in a proper blend ratio by particle size and a manufacturing method thereof .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a sound absorbing material containing a soft material,

The present invention relates to a sound absorbing material containing a soft material and a method of manufacturing the same, and more particularly to a sound absorbing material including a soft material discharged from a carbon burning process among industrial by-products generated from a thermal power plant and a sound absorbing plate including the same .

Burning as a by-product of industrial waste remaining after incineration or combustion in a briquetting power plant. The soft material is a recyclable material because it is a remnant of combustible material. However, since it is burned, it is difficult to apply technically because unburnt carbon is included incidentally. As a result, power plant byproducts are used only as materials for simple landfills in roads and athletic fields, and the rest are all buried. Because of the waste treatment of hundreds of thousands tons of soft materials generated in large quantities, the shortage of landfill sites is becoming serious and there are problems such as environmental damage around the landfill. Therefore, by recycling the by-product of the power plant, which is hardly recycled and recycled, it is possible to prevent the expansion of the re-treatment plant, reduce the cost economically, and find a recycling method that can prevent environmental pollution.

It is widely used for the production of aggregate. It is used as a sound absorbing material such as a soundproof wall and a sound absorbing plate which are used to block traffic noise and interlayer noise by using such an aggregate. Prior arts such as WO 2013-032288 and KR 2005-0005193 have been developed for such a sound-absorbing plate. However, in the prior art using aggregate, most of them are mixed with simple aggregate and other aggregates. Therefore, It is hard to judge it as a sound-absorbing plate. Also, in order to develop a more effective sound-absorbing plate, a technique of forming a blend ratio of the soft material in different particle sizes has not been developed.

In order to solve such conventional problems, the inventors of the present invention have attempted to develop a sound-absorbing plate which provides a better sound absorption ratio by mixing variously depending on the particle size of a soft material.

It is an object of the present invention to provide a sound absorbing material including a soft material and a method of manufacturing the same.

Another object of the present invention is to provide a sound absorbing panel comprising a sound absorbing material having excellent sound absorbing ratio by mixing soft materials in appropriate mixing ratio by particle size and a method for manufacturing the same.

The above and other objects of the present invention can be achieved by the present invention described below.

In order to achieve the above object, the present invention provides a sound absorbing material comprising 50 to 76 wt% of a soft material, 16 to 28 wt% of a binder, and 7 to 19 wt% of water.

In one embodiment of the present invention, the soft material includes a first soft material, a second soft material and a third soft material, and the mixing ratio thereof is such that the first soft material: the second soft material: the third soft material : 4: 2, the first soft material has a particle size of 2 mm or less, the second soft material has a particle size of 4 to 6 mm, and the third soft material has a particle size of 8 mm or more.

In one embodiment of the invention, the sound-absorbing agent may additionally comprise from 0.3 to 1.5% by weight of waste urethane and from 0.3 to 1.5% by weight of ceramic material.

In one embodiment of the present invention, there is provided a sound-absorbing plate comprising the sound-absorbing agent.

In one embodiment of the present invention, there is provided a method of producing a sound absorbing material, comprising the steps of: 1) mixing a soft material 50 to 76% by weight, a binder 16 to 28% by weight and water 7 to 19% by weight; 2) shaping the sound absorbing agent into a plate of a desired size to prepare a molded product; 3) drying the molded product to prepare a dried product; And 4) firing the dried material.

In one embodiment of the present invention, in the step 1), it may further include mixing 0.3 to 1.5 wt% of the waste urethane and 0.3 to 1.5 wt% of the saccharic material.

In one embodiment of the present invention, the soft material includes a first soft material, a second soft material and a third soft material, and the mixing ratio thereof is such that the first soft material: the second soft material: the third soft material : 4: 2, the first soft material has a particle size of 2 mm or less, the second soft material has a particle size of 4 to 6 mm, and the third soft material has a particle size of 8 mm or more .

A specific manufacturing method of the sound absorbing plate according to the present invention is as follows. The burned material, which is a by-product from the power plant, is sampled in the field, and the impurities are removed through drying and washing processes. The three types of soft materials sorted by particle size are mixed with cement, water, waste urethane and ceramics . At this time, the soft material, the cement, the waste urethane and the ceramic material are first dried and then water is added to the mixture. The mixture is put into a mold in a thickness of 40 mm and pressed at 90 to 150 DEG C by a press to form a plate of a predetermined size. After being separated from the mold, it is dried at 100 to 200 ° C for 30 to 90 minutes, charged into a sintering machine at 1050 to 1100 ° C, and baked for 30 minutes to produce a sound-absorbing plate.

The above-mentioned molding refers to a general molding process, which means all of assembly molding, extrusion molding, compression molding, injection molding, and the like, and all the conventional molding methods known in the art can be applied.

The sound-absorbing panel is not limited to the name of the sound-absorbing panel, but can be applied to a manufacturing construction field applied to a residential space, a railroad track, a roadway, a construction site, and the like.

Hereinafter, each component of the sound absorbing panel of the present invention will be described in detail.

(A) Soft material

The soft material used in the present invention may be used in an amount of 50 to 76% by weight. If it is less than 50% by weight, the workability may deteriorate. If it exceeds 76% by weight, there is a risk of cracking.

The soft material was ground and processed into three types of soft materials having particle sizes of 1 to 10 mm and sizes of 2 mm or less, 4 to 6 mm, and 8 mm or more depending on the size of the granules. The soft material is classified into a first soft material having a diameter of 2 mm or less as a first soft material, a soft material having a diameter of 4 to 6 mm as a second soft material and a soft material having a diameter of 8 mm or more as a third soft material, .

(B) Binder

The binder used in the present invention may be used in an amount of 16 to 28% by weight. If it is less than 16% by weight, there may be a problem that the bonding force is lowered. If it exceeds 40% by weight, economical efficiency may be deteriorated.

Cement is used as the binder. Portland cement (OPC) can be mainly used for the cement. Depending on its properties and applications, it can be used as crude steel portland cement, medium heat portland cement, alumina cement, blast furnace cement, silica cement, white Portland cement May be used, but are not limited thereto.

(C) Waste urethane

Because the waste urethane used in the present invention is further added to the sound-absorbing plate using the soft material due to its heat insulating and sound insulating properties, it can exhibit further improved soundproofing, dustproofing, and heat insulating effect. The waste urethane according to the present invention may be used in an amount of 0.3 to 1.5% by weight. If the content is less than 0.3 wt%, the desired soundproofing effect may not be obtained. If the content is more than 1.5 wt%, the workability may be deteriorated.

(D) Ceramic material

The ceramic material used in the present invention can make preservation of the sound-absorbing plate possible for a long period of time due to the characteristic of radial and far-infrared radiation. Further, the effect of sterilizing and disinfecting the sound absorbing plate can be expected. The ceramic material according to the present invention may be used in an amount of 0.3 to 1.5% by weight. If the content is less than 0.3 wt%, the effect may be deteriorated. If the content is more than 1.5 wt%, the durability may be deteriorated.

(E) Water

Water according to the present invention may be included in an amount of 7 to 19% by weight. When added in an amount of not more than 7% by weight, there may be a problem that binding force is lowered. When added in an amount of not less than 19% by weight, workability and durability are lowered. Can be adjusted.

(F) Other additives

Other additives may be added in addition to the object of the present invention, such as retarding agents, defoaming agents, water reducing agents, fluidizing agents, accelerators, thickeners, crack reducing agents, antibacterial agents, durability improving agents, water reducing agents, swelling agents, have.

When a sound-absorbing plate including the soft material according to the present invention is applied, it can be used for soundproofing, sound absorption and sound insulation due to the property that the sound absorption rate is improved.

In addition, the present invention is expected to be applied to the field of manufacturing and construction such as traffic noise and interlayer noise, which is a technique which is implemented by mixing a soft material in a proper ratio according to the size of granular materials in order to develop more effective sound absorbing panels.

Hereinafter, the present invention will be described in detail with reference to the following examples. However, the following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

Example  And Comparative Example : Manufacture of Sound Absorption Boards by Mixing Ratio Mixture by Size

The by-product, which is a by-product generated from the power plant, is sampled in the field, and the impurities are removed through drying and washing processes. The first, second and third soft materials, And mixed with cement, water, waste urethane and ceramics according to a certain ratio. At this time, the soft material, the cement, the waste urethane, and the ceramic material were first dried and then water was added thereto. The mixture was put into a mold at a thickness of 40 mm and pressed at 90 to 150 캜 by a press to form a plate having a predetermined size. After being separated from the mold, the sheet was dried at 100 to 200 ° C for 30 to 90 minutes, put in a firing machine at 1050 to 1100 ° C, and fired for 30 minutes to produce a sound-absorbing plate. The added water can be adjusted depending on the water content of each component.

Table 1 below shows the mixing ratio of the sound-absorbing plate prepared by pulverizing and sieving the soft materials according to sizes and mixing them in various ratios.

Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 Example 3 Example 4 The 1st soft material 61.4 - - 8.9 8.9 8.9 8.9 The second soft material - 61.9 - 35.2 35.2 35.2 35.2 Third row material - - 61.0 17.5 17.5 17.5 17.5 cement 24.5 24.3 24.9 24.1 24.1 24.1 24.1 water 14.1 13.8 14.1 14.3 13.8 13.8 13.3 Waste urethane - - - - 0.5 - 0.5 Ceramic material - - - - - 0.5 0.5 Sum 100 100 100 100 100 100 100

Content Unit: wt%

Table 1 shows the sound absorbing panels prepared in Comparative Examples 1 to 3 and Examples 1 to 4 in various mixing ratios of soft materials. Comparative Example 1 included only the first combustion material, Comparative Example 2 included the second combustion material And only Comparative Example 3 included only the third combustion material. On the other hand, in Example 1, a sound-absorbing plate including the first soft material, the second soft material and the three soft material in a ratio of 1: 4: 2 was prepared. Examples 2 to 3 are examples of the waste urethane A ceramic material was further added. Example 4 was prepared in the same manner as in Example 1 except that both the waste urethane and the ceramic material were added.

Sound absorption test of sound-absorbing panels

The sound absorption plate manufactured in Table 1 was tested for sound absorption. According to the method of measuring the sound absorption rate of the reverberation room in the reverberation room, the sound absorption test was performed five times according to KS F 2805, and the average value was obtained. The results are shown in Table 2 below.

frequency
(Hz) Reverberation time (sec) Absorption coefficient
(NRC) Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 Example 3 Example 4 100 42.9 41.6 43.2 32.5 29.6 30.1 25.1 0.71 125 41.4 39.5 41.9 30.4 25.7 28.2 21.2 0.70 160 37.9 35.2 36.4 20.2 17.5 18.9 16.1 0.73 200 30.1 25.1 30.1 18.8 15.5 16.5 14.1 0.77 250 26.5 21.4 25.6 14.2 11.3 12.0 10.6 0.71 315 24.9 19.5 24.1 13.4 10.9 11.1 10.1 0.70 400 23.8 14.2 21.8 11.4 8.4 9.1 7.6 0.76 500 20.5 13.8 17.5 10.9 6.9 8.6 5.1 0.73 630 16.3 13.9 15.4 10.2 5.9 6.5 4.2 0.78 800 14.9 11.5 13.6 8.8 4.6 4.8 3.9 0.75 1000 12.5 8.4 12.4 6.1 3.8 4.7 3.5 0.70 1250 12.0 7.7 10.7 6.1 3.7 4.4 3.1 0.72 1600 8.7 7.1 8.5 5.7 3.7 4.1 3.2 0.71 2000 7.3 6.9 7.1 5.4 4.2 4.9 3.6 0.70 2500 7.0 5.5 6.0 5.1 4.1 4.7 3.6 0.73 3150 6.4 5.9 6.2 5.7 4.3 4.9 3.5 0.71

In Table 2, the reverberation time is shorter as the sound absorption rate of the sound absorption plate mounted on the reverberation chamber is higher. Comparing the comparative examples 1 to 3, it can be seen that the best sound absorption ratio is shown in the comparative example 2 including only the second combustion material having the medium particle size. The first embodiment shows that the reverberation time is shorter in all the octave band frequency ranges than the first to third comparative examples, and the sound absorption performance of the sound absorption plate is improved. As a result, it can be seen that the sound absorption rate of the sound absorbing plate including the burned material having the three particle sizes is greater than that of the sound absorbing plate made only with one particle size, And it was confirmed that it was excellent.

As a result of comparing the results of Examples 1 to 3, it was confirmed that the sound absorption rate in the sound absorption plates (Examples 2 and 3) in which waste urethane or ceramic material was added was superior to that of the sound absorption plates (Example 1) not containing them. Further, through further comparisons with Example 4, it can be seen that when both the waste urethane or the ceramic material were added in a ratio of 1: 1 as compared with the case where the waste urethane or ceramic material was added alone (Examples 2 and 3) It can be confirmed that the sound absorption effect is the most excellent.

In the industry standard related to the soundproofing wall, the minimum standard of the sound absorption coefficient (NRC) is set to 0.7 or more. Since the sound absorption plate according to the first embodiment of the present invention exhibits a sound absorption coefficient of 0.7 or more in all octave band frequency ranges, And it was found that it is possible to achieve excellent soundproofing effect.

Claims (7)

From 53 to 76% by weight of a soft material, from 16 to 28% by weight of a binder, from 7 to 19% by weight of water, from 0.3 to 1.5% by weight of waste urethane and from 0.3 to 1.5% by weight of a ceramic material,
Wherein the soft material includes a first soft material, a second soft material, and a third soft material, wherein the mixing ratio of the first soft material, the second soft material, and the third soft material is 1: 4: 2,
The first soft material has a particle size of 2 mm or less, the second soft material has a particle size of 4 to 6 mm, and the third soft material has a particle size of 8 mm or more. delete delete A sound-absorbing panel comprising the sound-absorbing agent according to claim 1. 1) Mixing 53 to 76% by weight of soft material, 16 to 28% by weight of binder and 7 to 19% by weight of water, further mixing 0.3 to 1.5% by weight of waste urethane and 0.3 to 1.5% by weight of ceramic material, ;
2) shaping the sound absorbing agent into a plate of a desired size to prepare a molded product;
3) drying the molded product to prepare a dried product; And
4) firing the dried material,
Wherein the soft material includes a first soft material, a second soft material, and a third soft material, wherein the mixing ratio of the first soft material, the second soft material, and the third soft material is 1: 4: 2,
Wherein the first soft material has a particle size of 2 mm or less, the second soft material has a particle size of 4 to 6 mm, and the third soft material has a particle size of 8 mm or more. delete delete