KR100225407B1 - Continuous porous ceramic sound-absorbing materials and preparation thereof - Google Patents

Abstract

According to the present invention, there is provided a continuous porous breathable ceramic sound-absorbing material which is a fired panel containing 80 to 90 parts by weight of porous breathable inorganic granules having a porosity of 20 to 60% and an inorganic binder of 10 to 20 parts by weight, a manufacturing method thereof, and a sound absorbing material installation structure applying the same. In addition to the sound absorbing effect, these sound absorbing materials are excellent in water resistance, salt water, cold resistance, fire resistance, chemical resistance and weather resistance, and have no problem of deterioration in performance as sound absorbing materials.

Description

Continuous porous breathable ceramic sound absorbing material, manufacturing method and sound absorbing material installation structure

The present invention relates to a sound absorbing material and a sound absorbing material mounting structure using a porous porous inorganic ceramic material and an inorganic binder.

Regarding the sound absorbing material and the sound absorbing material installation structure known in the art, Korean Patent Laid-Open Publication No. 91-18617 describes a sound absorbing material filled with aluminum foil, fiber, or nonwoven fabric between aluminum metal meshes. This sound absorbing material is used to form a sound barrier by inserting it into an I beam as shown in FIG. However, such a rechargeable sound absorbing material has a problem that the sound coming through the metal net is attenuated by the filler to be discharged out of the metal net after being attenuated to some extent and the sound hitting the metal net is reflected, so that the sound absorbing effect is not sufficient. Because it is a metal, corrosion occurs and performance deteriorates when it is used for a long time, and it is difficult to remove foreign substances that enter the inside of the metal network, thereby reducing the sound absorbing effect.

In addition, Korean Unexamined Patent Publication No. 95-31980 and Korean Unexamined Patent Publication No. 96-800 disclose concrete absorbers. The concrete sound absorbing material of Korean Patent Application Publication No. 95-31980 is first stirred by mixing animal protein foaming agent, aluminum powder, and air conduction retardant with water, and then calcined lime, alumina cement, silica sand, gypsum, citric acid, and one kind of cement. It is made by adding a urethane resin, secondary stirring, wet curing, high temperature and high pressure curing treatment, and then surface treatment with a silicone oil-based water repellent to have an independent pore structure. Concrete absorber of Korean Patent Publication No. 96-800 is a mixture of natural and artificial porous aggregates or polymers with three-dimensional micropores and cement and cement, kneading blowing agent and water to generate bubbles, and then performing high temperature and high pressure curing. I have a bubble. The latter continuous bubble type sound absorbing material is superior in sound absorption effect compared to the former independent bubble type. Figure 5 schematically shows a sound absorbing material installation structure to which the conventional independent foam type cement sound absorbing material is applied.

However, cement absorbers, whether continuous or independent, have a high water absorption rate and must be surface-coated with water repellents, such as the former, in order to reduce them. There is a problem such as that, and also because the volume is about 100 to 200 mm inconvenient in transportation, storage and construction has been pointed out as a big disadvantage.

Accordingly, an object of the present invention is to provide a continuous porous breathable ceramic sound absorbing material, a method of manufacturing the same, and a sound absorbing material installation structure having a small volume, low water absorption without water repellent treatment, and a sound absorbing effect maintained almost semi permanently.

1 is a schematic enlarged cross-sectional view showing a sound propagation and sound absorption path in a porous breathable assembly embedded in a continuous porous breathable ceramic sound absorbing material according to the present invention;

Figure 2 is a schematic cross-sectional view showing a sound absorption process in the structure of the sound absorbing material to which the inorganic ceramic sound absorbing material is applied according to the present invention;

3 is an enlarged view of a circle A portion of FIG.

4 is a schematic cross-sectional view showing a sound absorbing material installation structure to which a conventional metal mesh sound absorbing material is applied;

Figure 5 is a schematic cross-sectional view showing a sound absorbing material installation structure to which a conventional cement sound absorbing material is applied

※ Explanation of code about main part of drawing ※

1: Sound absorbing material 2: Porous porous ceramic assembly

3: sound absorbing material support means 4: sound absorbing material connecting means

5: air layer 6: wall surface

According to the present invention for solving the above problems is a continuous porous breathable ceramic sound-absorbing material, characterized in that it is a fired panel containing 80 to 90 parts by weight of porous porous inorganic ceramic granules having a porosity of 20 to 60% and 10 to 20 parts by weight of an inorganic binder. Is provided.

According to the present invention, a process of kneading 80 to 90 parts by weight of porous porous inorganic granules having a porosity of 20 to 60%, 10 to 20 parts by weight of an inorganic binder, and 5 to 10 parts by weight of water, and the resulting kneaded material are press-molded into a panel shape. There is provided a method for producing a continuous porous breathable ceramic sound absorbing material comprising a step of drying, and a step of firing and cooling the resulting molded product.

In addition, according to the present invention, a plurality of plastic panel sound absorbing materials containing 80 to 90 parts by weight of porous air-permeable inorganic granules having a porosity of 20 to 60% and 10 to 20 parts by weight of an inorganic binder, and the opposite ends of the sound absorbing materials having one end adjacent to each other The other end is fixed to the installation wall surface is provided between the sound absorbing material support means for providing an air layer between the sound absorbing material and the wall surface, and is connected between the opposite ends of the sound absorbing material adjacent to each other is fastened to the support means to connect the plastic panels There is provided a sound absorbing material installation structure comprising a sound absorbing material connecting means.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

In the porous breathable ceramic sound absorbing material according to the present invention, as the porous breathable inorganic assembly, one or more selected from mullite assembly, bottom ash assembly, diatomaceous earth assembly, and other ceramic porous assemblies may be used. The average particle diameter of the porous porous inorganic granules is suitably about 0.5 to 2.0 mm. As shown in Figure 1, such porous breathable assembly (2) acts to weaken the sound passing through the pores are communicated as if the anthill.

As the inorganic binder, clay, kaolin, a mixture of clay and kaolin, water glass, or the like can be used.

In addition to the raw materials described above, inorganic pigments may be added together with the inorganic binder to give various colors if desired. The preferred amount of addition is 1.0 to 5.0% by weight based on the weight of the inorganic binder.

In particular, it is important to apply different firing methods depending on the selection of the inorganic binder. For example, when the inorganic binder is clay, kaolin, a mixture of clay and kaolin, high temperature firing is preferable, and when the inorganic binder is water glass, low temperature baking desirable. In the case of high-temperature firing, it is suitable to bake for about 2 to 4 hours at the firing temperature of 1,200 ° C to 1,300 ° C, and in the case of low-temperature firing, after the first firing for 10 to 20 minutes at the firing temperature of 100 ° C to 150 ° C, 200 It is appropriate to adopt a method of secondary firing for 20 to 40 minutes at a calcination temperature of 캜 to 300 캜.

The sound absorbing material manufactured by high temperature firing has a high strength of about 180 to 300 kgs / cm 2 and is suitable as an external sound absorbing material. The sound absorbing material produced by low temperature firing is about 120 to 180 kgs / cm 2 and suitable as a built-in sound absorbing material.

The continuous porous breathable ceramic sound absorbing material according to the present invention has excellent sound absorbing effect even when manufactured to a thickness of 10 to 20 mm, but in order to further improve the sound absorbing effect, the sound absorbing material 1 is illustrated as a preferred embodiment in FIGS. 2 and 3. It is preferable to form an air layer 5 between the wall surface 6 and the wall surface 6. Here, the wall means a wall of an existing structure or panel.

In such a sound absorbing material mounting structure, it is preferable that the continuous porous breathable ceramic sound absorbing material 1 be 10 mm or more in thickness, and the air layer 5 is designed to have a thickness of about 50 to 200 mm. As the thickness of the air layer increases, the sound absorption rate also increases.

As an example of a method for installing the sound absorbing material on the wall surface while forming the air layer 5 between the sound absorbing material 1 and the wall surface 6, in FIG. 2, one end of the sound absorbing material 1 is supported while the other end faces each other. Sound absorbing material support means (3) fixed to the mounting wall surface (6); Adjacent sound absorbing material supported by the support means 3 and the groove portion which is inserted between the opposite ends of the sound absorbing material adjacent to each other and is in contact with the support means 3 and fixed to the support means 3 by fastening means such as screws. Sound absorbing and reconnecting means (4) having a flange for joining both ends of the upper portion is used. Of course, the present invention is not limited thereto, and another method similar thereto may be applied to secure the air layer.

As such, when the air layer 5 is formed between the sound absorbing material 1 and the mounting wall surface 6, it has been shown that the sound attenuated while passing through the sound absorbing material almost completely makes noise in the air layer.

Features and other advantages of the present invention as described above will become more apparent from the embodiments described below. However, this invention is not limited by the following Example.

<Example 1>

80 parts by weight of granite granules having an average porosity of 30% as the porous breathable granulation, and 10 parts by weight of clay as the inorganic binder and 10 parts by weight of water were kneaded to obtain a panel having a width of 300 mm x length of 300 mm x thickness 10 mm. This was dried at room temperature, fired at a firing temperature of 1,200 ° C. to 1,300 ° C. for 3 hours, and cooled to prepare a continuous porous breathable ceramic sound absorbing material. The average compressive strength measured by randomly extracting 30 manufactured sound absorbers was 230 ± 10kgs / cm 2, and the average absorption was 3.0 ~ 5.0%.

In addition, the prepared sound absorbing material was installed as shown in FIG. The thickness of the air layer was 100mm, ambient temperature was 10 ℃, and ambient humidity was 70%. With respect to the above-described installation structure, the sound absorption rate was measured at each sample area of 5.60 m 2 according to KS-F2805 (Method of Sound Absorption in Reverberation Chamber).

<Examples 2 to 6>

The same procedure as in Example 1 was repeated except that the porous breathable granulation, the type and compounding ratio of the inorganic binder, and the calcination process were changed as shown in Table 1 below.

Example 2 Example 3 Example 4 Example 5 Example 6 Porous Assembly Kinds Diatomaceous earth Bottom ash Mullite Diatomaceous earth Bottom ash Porosity 28% 32% 30% 28% 32% content 80 80 copies Part 85 Part 85 Part 85 Binder Clay, part 10 Clay, part 10 Water glass, part 5 Water glass, part 5 Water glass, part 5 Coma Water, part 10 Water, part 10 Water, part 10 Water, part 10 Water, part 10 Cattle temperature 1200 to 1250 ° C for 3 hours 1200 to 1250 ° C for 3 hours Primary firing: 100 ° C, 20 minutes Secondary firing: 250 ° C, 40 minutes Primary firing: 100 ° C, 20 minutes Secondary firing: 250 ° C, 40 minutes Primary firing: 100 ° C, 20 minutes Secondary firing: 250 ° C, 40 minutes Compressive strength 180 to 200 (kgs / ㎠) 200 to 220 (kgs / ㎠) 165 to 180 (kgs / ㎠) 125 to 140 (kgs / ㎠) 140 to 150 (kgs / ㎠) Water absorption 5.0-8.0% 4.0-6.0% 4.0-6.0% 6.0-9.0% 5.0-7.0%

Measurement frequency (HZ) Sound absorption rate measurement Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 250 0.743 0.721 0.765 0.715 0.705 0.743 500 0.813 0.795 0.821 0.885 0.772 0.815 1,000 0.791 0.763 0.805 0.763 0.751 0.801 2,000 0.701 0.715 0.735 0.685 0.693 0.725 4,000 0.742 0.735 0.768 0.723 0.715 0.753

As can be seen from Tables 1 and 2, the results of the sound absorption rate measurement for the sound absorbing material mounting structure to which the sound absorbing material of Examples 1 to 6 according to the present invention are applied are excellent in sound absorption effect of 0.7 or more at most center frequencies. It also shows excellent results in other water, salt water, cold, fire, chemical and weather resistance tests. There is no problem of deterioration of performance as a sound absorbing material, and it is superior to conventional sound absorbing materials in durability.

Claims (6)

In the method for producing a sound absorbing material, a step of kneading 80 to 90 parts by weight of porous air-permeable inorganic ceramic granules having a porosity of 20 to 60%, 10 to 20 parts by weight of an inorganic binder and 5 to 10 parts by weight of water, and the resulting kneaded material in the form of a panel. A process for producing a continuous porous breathable ceramic sound absorbing material comprising a step of pressing and drying the product, and a step of firing and cooling the resulting molded product. The method of claim 1, wherein the porous porous inorganic ceramic assembly is at least one selected from the group consisting of mullite assembly, bottom ash assembly, or diatomaceous earth assembly. . 3. The continuous porous according to claim 1 or 2, wherein the inorganic binder is clay, kaolin or a mixture of clay and kaolin, and the firing process is performed at a firing temperature of 1,200 占 폚 to 1,300 占 폚 for about 2 to 4 hours. Method for producing a breathable ceramic sound absorbing material. The method of claim 1 or 2, wherein the inorganic binder is water glass, and the firing step is 20 seconds at a firing temperature of 200 ℃ to 300 ℃ after the first firing for 10 to 20 minutes at a firing temperature of 100 ℃ to 150 ℃ A method for producing a continuous porous breathable ceramic sound absorbing material, characterized by consisting of secondary firing for ˜40 minutes. A sound absorbing material comprising: a fired panel containing 80 to 90 parts by weight of porous porous inorganic ceramic granules having a porosity of 20 to 60% and 10 to 20 parts by weight of an inorganic binder. In the structure of the sound absorbing material, a plurality of plastic panel sound absorbing material (1) containing 80 to 90 parts by weight of porous air-permeable inorganic ceramic granules having a porosity of 20 to 60% and an inorganic binder of 10 to 20 parts by weight, and the sound absorbing material having one end adjacent to each other Sound absorbing material support means (3) for supporting both ends facing each other of the field and the other end is fixed to the installation wall surface (6) to provide an air layer (5) between the sound absorbing material and the wall surface, and inserted between the opposite ends of the sound absorbing material adjacent to each other And a sound absorbing material connecting means (4) connecting the plastic panels by being fastened to the supporting means.

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