High-performance sound insulation paint

Abstract

The present invention relates to a high-performance sound insulation paint showing a sound absorption effect, and provides a sound insulation paint for coating including 15 to 25 weight % of soda-lime borosilicate glass, 36 to 46 weight % of a binder, 8 to 15 weight % of titanium dioxide, 8 to 15 weight % of aluminum potassium silicate, 20 to 30 weight % of water, and 2 to 5 weight % of Texanol.

Claims

1. A sound insulation paint comprising: 15 to 25 weight % of soda-lime borosilicate glass; 36 to 46 weight % of a binder; 7 to 15 weight % of titanium dioxide; 8 to 15 weight % of aluminum potassium silicate; 20 to 30 weight % of water; and 2 to 5 weight % of Texanol, wherein the aluminum potassium silicate includes 30 to 50 weight % of silica, 10 to 20 weight % of aluminium oxide, 10 to 27 weight % of magnesium oxide, 3 to 17 weight % of iron oxide, 5 to 15 weight % of potassium oxide, and 1 to 3 weight % of other oxides, and has a bulk density of 0.3 to 0.4.

2. The sound insulation paint according to claim 1, wherein the binder is an anion dispersed-type water-soluble styrene denatured acrylate copolymer.

3. The sound insulation paint according to claim 1, wherein soda-lime borosilicate glass includes 70 to 80 weight % of silica, 5 to 15 weight % of calcium oxide, 3 to 8 weight % of sodium oxide, and 2 to 7 weight % of boron, and has a density of 0.38 or less.

4. The sound insulation paint according to claim 1, further comprising 0.1 to 0.4 weight % of a neutralizer, wherein the neutralizer is one of a material selected from the group consisting of 2-amino-2-methyl-1-propanol and aqueous ammonia, and the sound insulation paint further includes 0.5 to 0.8 weight % of a refrigeration stabilizer, 0.2 to 0.4 weight % of a surfactant, 0.3 to 0.5 weight % of a preservative, 0.3 to 0.6 weight % of a disperser, 0.3 to 0.6 weight % of an antifoaming agent, and 0.3 to 0.5 weight % of a thickener.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a graph showing a relationship among reflection, transmission, and absorption of sound.

(2) FIG. 2 is a graph showing a sound transmission loss at each frequency with respect to transmission losses of a single wall and a double wall of a general sound insulation material.

(3) FIG. 3 is a graph showing a sound transmission loss at each frequency with respect to transmission losses of a single wall and a double wall of a general sound insulation material.

DESCRIPTION OF EMBODIMENT

(4) A composition according to the present invention has various functions. In particular, an acrylic binder has a function as an adhesive with a base plate. A disperser is compatible with the acrylic binder and water to enhance workability. A neutralizer is used to adjust a pH of the composition to enhance storage stability of the composition. In applying an ultralight filler having ultrafine particulate hollow structures to form a coating, SLBG blocks or significantly reduces noise in void layers in an upper portion of the coating for sound waves transferred to an upper layer.

(5) In addition, since APS has a minute flaky composite-layer structure that is finely formed in a composite manner, in the course of transmission of sound waves incident through the SLBG layer to the composite layer, friction due to vibrations of air caused by sound pressure changes sound energy to thermal energy, and the energy is absorbed and extinguished.

(6) More specifically, in a coating according to the present invention, a large amount of sound is repeatedly reflected and absorbed in both of the void layers and the composite layer that is present inside a material of the present invention, and as a result, the effect of sound insulation can be maximized.

(7) In other words, description will be given as an effect and a principle of reducing vibrations of noise that has entered the material. The sound insulation paint according to the present invention is an environmentally friendly aqueous sound insulation paint formed by mixing an acrylic binder, SLBG, titanium dioxide, and APS at high density. Although the sound insulation paint is thin, the sound insulation effect of sound absorption and noise filtering thereof are different from a conventional sound insulation material (including paint) in terms of thickness and performance. The sound insulation paint is a ultralight and ultrathin film having a weight of 1/10 or less of a general sound insulation material and a thickness of 1/20 or less of the general sound insulation material.

(8) Functions based on the principle of the invention described above will be described below in detail.

(9) FIG. 1 shows a relationship among reflection, transmission, and absorption of sound in a case where sound enters a coating film obtained by applying a sound insulation paint according to the present invention to a base material requiring measures for sound insulation in order to insulate noise (hereinafter referred to as a “sound insulation material”).

(10) For example, in a case where the sound insulation material has a transmission loss TL of 40 dB, a transmittance expressed by a ratio between an incident noise level pi and a transmission noise level pt is τ=(10.sup.(−TL/10)/10)=0.0001 from the equation of TL=10 log.sub.10(1/τ), which means 1/10000 of the incident noise level is transmitted.

(11) As shown in FIG. 1, the incident noise level can be expressed by
pi=pr+pt+pa  (1)
where Pi is an incident noise level, Pr is a reflected noise level, pt is a transmission noise level, and pa is an absorption level, and τ: transmittance (pt/pi).

(12) From Equation (1), the sound insulation paint according to the present invention has a layered structure for obtaining layers for sound insulation and sound absorption layer in a composite manner in order to increase a sound transmission loss (acoustical attenuation constant) of the sound insulation material, based on the equation.

(13) More specifically, since a loss of the transmission loss has a limitation in terms of mass, functionality as a sound insulation material is provided by isolation of multiple layers or hollow layers of media having different densities.

(14) One of principles of the configuration of the present invention is as follows. Sound that has entered the sound insulation material is repeatedly reflected and absorbed in a process in which the sound passes through a large number of continuous void layers in an ultralight atomized structure disposed in an upper layer of the sound insulation material so that the transmission noise level pt decreases. Energy of sound that has passed through the void layers changes to have another pattern of sound waves at a boundary with a different material having an APS composite layer structure with a discontinuous flaky shape, and a loss of energy (in which friction of air vibrations changes kinetic energy of sound to thermal energy and the energy is lost), and thereby, sound absorption effect is enhanced.

(15) Sound insulation is a mechanism of reflecting sound waves, whereas sound absorption is a mechanism of absorbing sound waves. The absorption of sound waves is to attenuate wave energy of sound waves, and means that kinetic energy of medium particles causes vibrations or other phenomena on the material and changes to thermal energy.

(16) Consequently, by maximizing the volume of the ultralight void layers described above (note that as the distance between molecules increases, the amount of sound energy loss increases) and utilizing the principle of construction isolation, the sound insulation paint according to the present invention was obtained as an ultrathin film showing sound insulation and sound absorption.

(17) The principle of the configuration of the present invention will be further described below.

(18) Sound insulation performance in terms of mass greatly depends on the mass. In examining measures against noise, it is an important issue to obtain a sufficient mass of a sound insulation structure, but merely increasing the mass is not an effective measure. Thus, if composite layers can be constructed independently, a transmission loss thereof can obtain high sound insulation performance together with a transmission loss of each layer.

(19) As an example, a sound transmission loss for each frequency with respect to transmission losses of a single wall and a double wall of a general sound insulation material will be described with reference to FIGS. 2 and 3.

(20) The sound insulation paint according to the present invention can obtain high sound insulation performance and effect by an ultralight thin film with a combination of composite layers or a combination of sound of void layers.

(21) Examples of the present invention will be more specifically described.

Example 1

(22) First, 4 g of antifoaming agent and 22 g of Texanol were added to a mixture of 240 g of water, 3 g of a thickener, 3 g of a disperser, 2 g of neutralizer, 2 g of a preservative, 3 g of a surfactant, and 6 g of a refrigeration stabilizer while the mixture was stirred, and then the resulting mixture was uniformized. Thereafter, 100 g of titanium dioxide and 90 g of APS were added, and the resulting mixture was stirred at high speed for about 30 minutes. After it was confirmed that the degree of dispersion of the mixture was 5 or more, 400 g of an acrylic binder was added to the mixture while the mixture was stirred, and then, 200 g of SLBG was gradually supplied, and the resulting mixture was stirred at low speed for about 20 minutes.

Comparative Example 1

(23) First, 4 g of an antifoaming agent and 22 g of Texanol were added to a mixture of 240 g of water, 3 g of a thickener, 3 g of a disperser, 2 g of a neutralizer, 2 g of a preservative, 3 g of a surfactant, and 6 g of a refrigeration stabilizer while the mixture was stirred, and then the resulting mixture was uniformized. Thereafter, 100 g of titanium dioxide and 90 g of APS were added to the mixture, and the resulting mixture was stirred at high speed for about 30 minutes. After it was confirmed that the degree of dispersion of the mixture was 5 or more, 400 g of an acrylic binder was added to the mixture while the mixture was stirred, and then, 100 g of SLBG and 100 g of magnesium silicate were gradually supplied, and the resulting mixture was stirred at low speed for about 20 minutes.

Comparative Example 2

(24) First, 4 g of an antifoaming agent and 22 g of Texanol were added to a mixture of 240 g of water, 3 g of a thickener, 3 g of a disperser, 2 g of a neutralizer, 2 g of a preservative, 3 g of a surfactant, and 6 g of a refrigeration stabilizer while the mixture was stirred, and then the resulting mixture was uniformized. Thereafter, 100 g of titanium dioxide and 90 g of APS were added to the mixture, and the resulting mixture was stirred at high speed for about 30 minutes. After it was confirmed that the degree of dispersion of the mixture was 5 or more, 400 g of an acrylic binder was added to the mixture while the mixture was stirred, and then, 200 g of magnesium silicate was gradually supplied, and the resulting mixture was stirred at low speed for about 20 minutes.

Sound Insulation Performance Test

Test Example 1—Test by Fabricating PVC Test Plate

(25) An evaluation was conducted by using the sound insulation paints obtained in Example 1, Comparative Example 1, and Comparative Example 2 described above. Specifically, each sound insulation paint was sprayed onto a PVC base plate (15 mm) three times (at 20° C., maintained for eight hours or more until recoating) and dried, and then, a box partitioned into two (W×L×H, each 1 m) was prepared and placed, and a gap was filled with a sealing material. Thereafter, noise transferred from one space (white noise source) to the another space was measured (with a noise measurement device).

(26) TABLE-US-00002 TABLE 2 Occurring Transferred Section noise (measured) noise Example 1 60 39 100 66 Comparative 60 47 Example 1 100 79 Comparative 60 53 Example 2 100 91
(Noise Measurement Result Value (dB))

(27) As clearly shown in the result of Table 2, in the case of applying the paint of Example 1 of the present invention, transferred noise is significantly reduced as compared to occurring noise, whereas in Comparative Example 2, transferred noise only slightly decreases. A comparison between about 15 dB of an average sound insulation level of a general fixture and about 40 dB of an average sound insulation level of a sound insulation fixture, Example 1 of the present invention shows a high level of sound insulation effect.

Test Example 2—Test by Acoustical Attenuation Constant Measurement for Each Frequency

(28) The sound insulation paint obtained by Example 1 was applied onto a glass cloth (25 mm) three times (at 20° C., maintained for eight hours or more until reapplication) and dried, and then, an acoustic coefficient for each frequency was measured based on KSF2808/2011 (insulation performance measuring method for air transfer noise of a building member). A sound transmission loss is a value obtained by multiplying, by ten, a common logarithm of an inverse number of a ratio between energy of sound that has entered the coating of Example 1 and energy of sound transmitted through the coating to the opposite side, and is represented as an acoustical attenuation constant (dB).

(29) TABLE-US-00003 TABLE 3 Frequency Acoustical attenuation Section (Hz) constant (dB) Example 1 125 18.6 2000 54.0 5000 61.2
(Acoustical Attenuation Constant Measurement Value (Sound Transmission Loss))

(30) As clearly shown in the result of Table 3 above, in the case of applying the paint of Example 1 of the present invention, an acoustical attenuation constant at a frequency of 125 Hz was 18.6 dB, which is 62% of 30 or more that is a condition for authorization and certification of a management standard (Notification of Ministry of Construction and Transportation of Korea No. 1999-393) of a sound insulation structure of a wall. An acoustical attenuation constant at a frequency of 2000 Hz was 54.0 dB, which is close to 98% of 55 or more that is a condition for authorization and certification of a management standard of the sound insulation structure of the wall. The result of Table 3 shows that sound insulation exhibits high effect in a range from a low frequency to a high frequency.

(31) TABLE-US-00004 TABLE 4 Sound transmission Center frequency loss (dB) 125 Hz 30 or more 500 Hz 45 or more 2000 Hz 55 or more

(Authorization and Certification of Condition for Management Standard (Notification of Ministry of Construction and Transportation of Korea No. 1999-393) of Sound Insulation Structure of Wall)

Example: Test Result Table of Sound Insulating Gypsum Board (Product Name: dBcheck)

(32) Table 5 below shows test result values on a system using a dBcheck of a sound insulating gypsum board in Korea Institute of Civil Engineering and Building Technology (KICT).

(33) TABLE-US-00005 TABLE 5 Section/System System 1 System 2 System Thickness and type Finishing 15 15 detail (mm) of gypsum board Base 15 15 Stud width 65 65 Heat insulator Rock wool Glass Wool (50 mm) 50 K 24 K Structure Certification Frequency condition System 1 System 2 Result 125 Hz 30 or more 37 41 value (dB) 500 Hz 45 or more 49 61 2000 Hz 55 or more 56 69

(34) The total thickness of the structure was 80 mm (except for the stud), and it is known that the KCC sound insulating gypsum board is constructed to have a double-wall structure with a total thickness of 50 mm (except for the stud).