Noise reduction coating for sound barrier panel and preparation method of noise reduction coating

Abstract

The invention discloses a noise reduction coating for a sound barrier panel and a preparation method of the noise reduction coating, and belongs to the technical field of coatings. The coating is prepared from the following components in parts by weight: 65 to 80 parts of polyurethane resin, 15 to 25 parts of quartz sand short fiber, 18 to 22 parts of carboxymethyl cellulose, 7 to 9 parts of aluminum silicate fiber, 8 to 10 parts of nano titanium dioxide, 35 to 48 parts of styrene-acrylic emulsion, 3.5 to 7 parts of lauryl sodium sulfate, 0.5 to 3.5 parts of potassium stearate, 1 to 3 parts of ultraviolet absorbent, 2 to 5 parts of defoaming agent, 0.5 to 1 part of sterilizing agent, 1 to 2 parts of dispersing agent, 12 to 18 parts of latex paint and 50 to 60 parts of deionized water. The prepared coating is sprayed on a cement fiberboard, nearly 60% of noise is absorbed by the noise reduction coating of the sound barrier panel, good sound absorption and noise reduction performance is achieved, and when the spraying thickness is larger than or equal to 2.4 mm, the optimal noise reduction effect is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and in particular relates to a noise reduction coating for a sound barrier panel and a preparation method thereof. Background Art

[0002] Noise is one of the three major pollutions. Especially with the rapid development of modern industry and the rise of the transportation industry, the noise generated by machinery has brought great interference to human life. Noise pollution not only affects the order and harmony of society, but also brings serious harm to humans and animals. Sound absorption and noise reduction, reducing the spread of noise has become one of the key issues related to the coordination of scientific and technological development, environmental protection and human survival. The current methods to solve noise are: control from the sound source, modify the equipment, improve the processing and assembly quality to reduce the generation of noise; use sound-absorbing materials, when the sound waves are transmitted, the sound intensity is weakened by the viscosity of the sound waves, damping friction, energy conversion and relaxation of the sound-absorbing materials. Since it is difficult to achieve control from the sound source in actual use due to technical breakthroughs and limited applications. Therefore, the use of sound-absorbing materials to reduce noise during the process of noise propagation has become the mainstream.

[0003] Noise reduction coatings, as a coating type sound-absorbing and noise reduction material, can be used in venues, shopping malls, theaters, waiting rooms, restaurants and other places, especially in the field of rail transit. However, existing noise reduction coatings are mainly made of porous materials, fibers, etc., attached to the interior roof and wall, forming a certain thickness of porous cotton-like coating materials. The coatings have many consumables, the coating thickness is large, and the noise reduction effect is average, and often fails to achieve the ideal noise reduction effect. In addition, due to the limitations of the physical and chemical properties of the raw materials themselves, it is difficult to combine different raw materials. The prepared coatings are easily aged and fall off when exposed to the air for a long time, and the application effect is poor.

[0004] Based on this, a noise reduction coating for sound barrier panels and a preparation method thereof are proposed. While having good sound absorption and noise reduction performance, reducing the coating thickness and dosage as much as possible has become a problem that needs to be solved at present. Summary of the invention

[0005] The first purpose of the present invention is to disclose a noise reduction coating for a sound barrier panel, which has excellent sound absorption and noise reduction performance.

[0006] The second purpose of the present invention is to propose a method for preparing noise reduction coating for sound barrier panels, which simplifies the production process of the coating and shortens the process cycle.

[0007] In order to solve the above problems, the technical solution adopted by the present invention is as follows:

[0008] A noise reduction coating for a sound barrier panel. The components thereof are, by weight, 65-80 parts of a polyurethane resin, 15-25 parts of short quartz sand fibers, 18-22 parts of carboxymethyl cellulose, 7-9 parts of aluminum silicate fibers, 8-10 parts of nano titanium dioxide, 35-48 parts of styrene acrylic emulsion, 3.5-7 parts of sodium lauryl sulfate, 0.5-3.5 parts of potassium stearate, 1-3 parts of an ultraviolet light absorber, 2-5 parts of a defoaming agent, 0.5-1 parts of a sterilizing agent, 1-2 parts of a dispersant, 12-18 parts of a latex paint, and 50-60 parts of deionized water.

[0009] Furthermore, in parts by weight, the components are 75 parts of polyurethane resin, 25 parts of quartz sand short fibers, 20 parts of carboxymethyl cellulose, 8 parts of aluminum silicate fibers, 10 parts of nano titanium dioxide, 45 parts of styrene acrylic emulsion, 7 parts of sodium lauryl sulfate, 3.2 parts of potassium stearate, 2.5 parts of ultraviolet light absorber, 5 parts of defoaming agent, 0.8 parts of sterilizer, 1 part of dispersant, 16 parts of latex paint and 50 parts of deionized water.

[0010] Furthermore, the ultraviolet light absorber is selected from one of UV-531, UV-9 and UV-234.

[0011] Furthermore, the sterilizing agent is obtained by mixing 35 wt.% of 1,3-dibromo-2,4-imidazolidinedione and 65 wt.% of sodium pyrithione.

[0012] Furthermore, the dispersant is selected from one of sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate.

[0013] Furthermore, the defoaming agent is dimethyl silicone oil.

[0014] Furthermore, the preparation method of the noise reduction coating for the sound barrier panel comprises the following steps:

[0015] (1) Adding polyurethane resin, styrene acrylic emulsion and dispersant into deionized water, stirring at a speed of 680-800 r / min for 30-45 min to obtain a mixed solution;

[0016] (2) adding corresponding amounts of sodium dodecyl sulfate, potassium stearate and carboxymethyl cellulose to the mixed solution of step (1), heating in a water bath, stirring and reacting for 25 to 40 minutes, then adding a mixed powder consisting of quartz sand short fibers, aluminum silicate fibers and nano-titanium dioxide, stirring at room temperature for 15 minutes to obtain a mixed solution;

[0017] (3) Add latex paint to the mixed solution obtained in step (2), stir for 20 to 30 minutes, then add dimethyl silicone oil, continue stirring for 15 minutes and let stand for 10 to 20 minutes. After the foam is eliminated and there is no adverse reaction, add sterilizer and ultraviolet light absorber, stir slowly and evenly, let stand for 15 minutes, and fill after the solution produces no obvious foam, so as to obtain the noise reduction coating for the sound barrier panel.

[0018] Furthermore, in step (2), the temperature of the water bath heating is 60°C.

[0019] Furthermore, in step (2), the mixed powder is prepared by grinding the quartz sand short fibers and aluminum silicate fibers in a pulverizer, then grinding the mixed particles in a ball mill, adding nano-titanium dioxide after the ball milling, and homogenizing to obtain the mixed powder.

[0020] Furthermore, the thickness of the noise reduction paint sprayed on the sound barrier panel is 2.5 mm.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) When the coating prepared by the present invention is sprayed on the cement fiber board, nearly 60% of the noise is absorbed by the noise reduction coating of the sound barrier panel, and the coating has excellent sound absorption and noise reduction performance.

[0023] (2) The present invention improves the scratch resistance and weather resistance of the coating after spraying by co-modifying with sodium dodecyl sulfate, potassium stearate and carboxymethyl cellulose.

[0024] (3) The present invention helps to control the coating thickness and paint film quality of the paint by adding latex paint and potassium stearate, and reduces the loss of the paint to a certain extent.

[0025] (4) When the prepared coating is sprayed onto the cement fiber board by the same spraying method, the optimal noise reduction effect is achieved when the spraying thickness is greater than or equal to 2.4 mm.

[0026] (5) The present invention adds a sterilizing agent and an ultraviolet light absorber after modification, which does not affect the noise reduction performance of the coating and can also improve the application field of the coating. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with specific embodiments.

[0028] Unless otherwise specified, the raw materials or reagents used in the following examples are all commercially available products;

[0029] The sterilizing agent is obtained by mixing 35 wt.% of 1,3-dibromo-2,4-imidazolidinedione and 65 wt.% of sodium pyrithione.

[0030] The test methods of the coatings obtained in the following embodiments are as follows:

[0031] Noise reduction performance test: The sound absorption coefficient is tested according to GBJ 88-1985 "Standing Wave Tube Method Sound Absorption Coefficient and Acoustic Impedance Measurement Specification";

[0032] Fire performance test: Fire performance is tested in accordance with GB 8624-1997 "Classification Method for Combustion Performance of Building Materials".

[0033] Example 1

[0034] A noise reduction coating for a sound barrier panel is composed of the following components by weight: 75 parts of polyurethane resin, 25 parts of quartz sand short fibers, 20 parts of carboxymethyl cellulose, 8 parts of aluminum silicate fibers, 10 parts of nano titanium dioxide, 45 parts of styrene acrylic emulsion, 7 parts of sodium lauryl sulfate, 3.2 parts of potassium stearate, 2.5 parts of ultraviolet light absorber, 5 parts of dimethyl silicone oil, 0.8 parts of bactericidal agent, 1 part of sodium hexametaphosphate, 16 parts of latex paint and 50 parts of deionized water.

[0035] The preparation method of the above-mentioned noise reduction coating for the sound barrier panel comprises the following steps:

[0036] (1) Adding polyurethane resin, styrene acrylic emulsion and sodium hexametaphosphate into deionized water according to the above formula, stirring at a speed of 680-800 r / min for 30-45 min to obtain a mixed solution;

[0037] (2) Putting quartz sand short fibers and aluminum silicate fibers into a pulverizer and crushing them, then putting the mixed particles into a ball mill for ball milling, adding nano titanium dioxide after the ball milling, and homogenizing to obtain a mixed powder; adding corresponding parts of sodium dodecyl sulfate, potassium stearate and carboxymethyl cellulose to the mixed solution of step (1), heating in a water bath at 60° C., stirring for reaction for 25 to 40 minutes, and then adding the above mixed powder, stirring at room temperature for 15 minutes to obtain a mixed solution;

[0038] (3) Add latex paint to the mixed solution obtained in step (2), stir for 20 to 30 minutes, then add dimethyl silicone oil, continue stirring for 15 minutes and let stand for 10 to 20 minutes. After the foam is eliminated and there is no adverse reaction, add sterilizer and ultraviolet light absorber, stir slowly and evenly, let stand for 15 minutes, and fill after the solution produces no obvious foam, so as to obtain the noise reduction coating for the sound barrier panel.

[0039] Example 2

[0040] A noise reduction coating for a sound barrier panel is composed of the following components by weight: 70 parts of polyurethane resin, 25 parts of quartz sand short fibers, 20 parts of carboxymethyl cellulose, 8 parts of aluminum silicate fibers, 8 parts of nano titanium dioxide, 45 parts of styrene acrylic emulsion, 6 parts of sodium lauryl sulfate, 3.5 parts of potassium stearate, 2 parts of ultraviolet light absorber, 4 parts of dimethyl silicone oil, 0.6 parts of bactericidal agent, 2 parts of sodium hexametaphosphate, 16 parts of latex paint and 55 parts of deionized water.

[0041] The preparation method of the above-mentioned noise reduction coating for the sound barrier panel is the same as that in Example 1.

[0042] Example 3

[0043] A noise reduction coating for a sound barrier panel is composed of the following components by weight: 65 parts of polyurethane resin, 20 parts of quartz sand short fibers, 18 parts of carboxymethyl cellulose, 9 parts of aluminum silicate fibers, 10 parts of nano titanium dioxide, 46 parts of styrene acrylic emulsion, 5 parts of sodium lauryl sulfate, 3.5 parts of potassium stearate, 3 parts of ultraviolet light absorber, 3 parts of dimethyl silicone oil, 0.8 parts of bactericidal agent, 1.5 parts of sodium hexametaphosphate, 12 parts of latex paint and 50 parts of deionized water.

[0044] The preparation method of the above-mentioned noise reduction coating for the sound barrier panel is the same as that in Example 1.

[0045] Example 4

[0046] A noise reduction coating for a sound barrier panel is composed of the following components by weight: 75 parts of polyurethane resin, 18 parts of quartz sand short fibers, 22 parts of carboxymethyl cellulose, 8 parts of aluminum silicate fibers, 9 parts of nano titanium dioxide, 39 parts of styrene acrylic emulsion, 7 parts of sodium lauryl sulfate, 1.5 parts of potassium stearate, 3 parts of ultraviolet light absorber, 2 parts of dimethyl silicone oil, 0.5 parts of bactericidal agent, 1 part of sodium hexametaphosphate, 14 parts of latex paint and 55 parts of deionized water.

[0047] The preparation method of the above-mentioned noise reduction coating for the sound barrier panel is the same as that in Example 1.

[0048] Example 5

[0049] A noise reduction coating for a sound barrier panel is composed of the following components by weight: 80 parts of polyurethane resin, 15 parts of quartz sand short fibers, 18 parts of carboxymethyl cellulose, 7 parts of aluminum silicate fibers, 8 parts of nano titanium dioxide, 42 parts of styrene acrylic emulsion, 3.5 parts of sodium lauryl sulfate, 0.5 parts of potassium stearate, 1 part of ultraviolet light absorber, 3 parts of dimethyl silicone oil, 1 part of bactericidal agent, 1 part of sodium hexametaphosphate, 18 parts of latex paint and 60 parts of deionized water.

[0050] The preparation method of the above-mentioned noise reduction coating for the sound barrier panel is the same as that in Example 1.

[0051] Comparative Example 1

[0052] A noise reduction coating for a sound barrier panel, the formula used is the same as that of Example 1, and the preparation method is as follows:

[0053] (1) Putting quartz sand short fibers and aluminum silicate fibers into a pulverizer and crushing them, then putting the mixed particles into a ball mill for ball milling, adding nano titanium dioxide after the ball milling, and homogenizing to obtain a mixed powder;

[0054] (2) The powder obtained in step (1) is added to deionized water together with polyurethane resin, styrene acrylic emulsion, carboxymethyl cellulose, sodium lauryl sulfate, potassium stearate, ultraviolet light absorber, dimethyl silicone oil, bactericide, dispersant and latex paint, and stirred at a speed of 680-800 r / min for 30-45 min to obtain a mixed solution.

[0055] Comparative Example 2

[0056] A noise reduction coating for a sound barrier panel is composed, by weight, of 75 parts of polyurethane resin, 25 parts of quartz sand short fibers, 45 parts of styrene acrylic emulsion, 7 parts of sodium lauryl sulfate, 3.2 parts of potassium stearate, 2.5 parts of ultraviolet light absorber, 5 parts of dimethyl silicone oil, 0.8 parts of bactericidal agent, 1 part of dispersant, 16 parts of latex paint and 88 parts of deionized water.

[0057] The preparation method of the above-mentioned noise reduction coating for the sound barrier panel comprises the following steps:

[0058] (1) Adding the polyurethane resin, styrene acrylic emulsion and dispersant into deionized water according to the above formula, stirring at a speed of 680-800 r / min for 30-45 min to obtain a mixed solution;

[0059] (2) Putting the quartz sand short fibers into a pulverizer and crushing them, and then putting the mixed particles into a ball mill for ball milling, and obtaining quartz sand short fiber powder after the ball milling; adding corresponding parts of sodium lauryl sulfate and potassium stearate to the mixed solution of step (1), stirring for 25 to 40 minutes, and then adding the above-mentioned quartz sand short fiber powder, stirring at room temperature for 15 minutes, to obtain a mixed solution;

[0060] (3) Add latex paint to the mixed solution obtained in step (2), stir for 20 to 30 minutes, then add dimethyl silicone oil, continue stirring for 15 minutes and let stand for 10 to 20 minutes. After the foam is eliminated and there is no adverse reaction, add sterilizer and ultraviolet light absorber, stir slowly and evenly, let stand for 15 minutes, and fill after the solution produces no obvious foam, so as to obtain the noise reduction coating for the sound barrier panel.

[0061] Comparative Example 3

[0062] A noise reduction coating for a sound barrier panel is composed of the following components by weight: 75 parts of polyurethane resin, 25 parts of quartz sand short fibers, 20 parts of carboxymethyl cellulose, 8 parts of aluminum silicate fibers, 10 parts of nano titanium dioxide, 45 parts of styrene acrylic emulsion, 7 parts of sodium lauryl sulfate, 2.5 parts of ultraviolet light absorber, 5 parts of dimethyl silicone oil, 0.8 parts of sterilizing agent, 1 part of dispersant and 70 parts of deionized water.

[0063] The preparation method of the above-mentioned noise reduction coating for the sound barrier panel comprises the following steps:

[0064] (1) Adding the polyurethane resin, styrene acrylic emulsion and dispersant into deionized water according to the above formula, stirring at a speed of 680-800 r / min for 30-45 min to obtain a mixed solution;

[0065] (2) Putting quartz sand short fibers and aluminum silicate fibers into a pulverizer and crushing them, then putting the mixed particles into a ball mill for ball milling, adding nano titanium dioxide after the ball milling, and homogenizing to obtain a mixed powder; adding corresponding portions of sterilizing agent and ultraviolet light absorber to the mixed solution of step (1), slowly stirring evenly, and then adding the above mixed powder, stirring at room temperature for 15 minutes to obtain a mixed solution;

[0066] (3) Add dimethyl silicone oil to the mixed solution obtained in step (2), continue stirring for 15 minutes, and then let it stand for 10 to 20 minutes. After the foam is eliminated and there is no adverse reaction, add sodium dodecyl sulfate and carboxymethyl cellulose, heat in a 60°C water bath, stir and react for 25 to 40 minutes, let it stand for 15 minutes, and fill it after the solution produces no obvious foam, thereby obtaining the noise reduction coating for the sound barrier panel.

[0067] The noise reduction coatings for the sound barrier panels prepared in the above-mentioned Examples 1 to 5 and Comparative Examples 1 to 3 were evenly sprayed on the cement fiber board with a spraying thickness of 2.5 mm ± 0.1 mm. The cement fiber boards with different coatings were tested for noise reduction performance and fire resistance performance, and the test results are shown in Table 1 below.

[0068] Table 1 Test results of coatings prepared in Examples 1 to 5 and Comparative Examples 1 to 3 sprayed on cement fiberboard

[0069]

[0070] The noise reduction coating for the sound barrier panel prepared in the above Example 1 was evenly sprayed on the cement fiber board with the spraying thickness of 1.8 mm, 2.0 mm, 2.2 mm, 2.4 mm, 2.6 mm and 2.8 mm respectively. The noise reduction performance test was carried out and the results are shown in Table 2 below.

[0071] Table 2 Noise reduction performance results of the coating prepared in Example 1 at different spraying thicknesses

[0072]

[0073] It can be seen from Table 1 that the noise reduction performance of the cement fiberboard sprayed with the noise reduction coating for the sound barrier panel prepared in Example 1 of the present invention is significantly improved compared with that of Comparative Examples 1 to 3. The coating prepared by the present invention is closely related to the formula and the order of adding materials in the preparation method. Changing the formula or changing the order of adding materials will reduce the performance of the coating of the present invention. In Examples 1 to 5, when the spraying thickness is 2.5mm±0.1mm, the sound absorption coefficient of the cement fiberboard sprayed in Example 1 is the highest, and nearly 60% of the noise is absorbed by the noise reduction coating for the sound barrier panel; the present invention is modified by sodium dodecyl sulfate, potassium stearate and carboxymethyl cellulose, which can improve the scratch resistance and weather resistance of the coating after spraying; by adding a sterilizing agent and an ultraviolet light absorber after the modification, the noise reduction performance of the coating is not affected while also improving the application field of the coating.

[0074] It can be seen from Table 2 that the coating prepared by the present invention has obvious differences in noise reduction performance at different spraying thicknesses. When the prepared coating is sprayed onto the cement fiber board by the same spraying method, the optimal value of noise reduction (sound absorption coefficient is 0.59) is reached when the spraying thickness is greater than 2.4 mm. At this time, if the coating thickness is further increased, the noise reduction performance is not significantly improved.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A noise reduction coating for a sound barrier panel, characterized in that: In parts by weight, the components are 65-80 parts of polyurethane resin, 15-25 parts of quartz sand short fibers, 18-22 parts of carboxymethyl cellulose, 7-9 parts of aluminum silicate fibers, 8-10 parts of nano titanium dioxide, 35-48 parts of styrene-acrylic emulsion, 3.5-7 parts of sodium dodecyl sulfate, 0.5-3.5 parts of potassium stearate, 1-3 parts of ultraviolet light absorber, 2-5 parts of defoamer, 0.5-1 parts of sterilizer, 1-2 parts of dispersant, 12-18 parts of latex paint, and 50-60 parts of deionized water.

2. The noise reduction coating for sound barrier panels according to claim 1, characterized in that: In parts by weight, the components are 75 parts of polyurethane resin, 25 parts of quartz sand short fibers, 20 parts of carboxymethyl cellulose, 8 parts of aluminum silicate fibers, 10 parts of nano titanium dioxide, 45 parts of styrene acrylic emulsion, 7 parts of sodium lauryl sulfate, 3.2 parts of potassium stearate, 2.5 parts of ultraviolet light absorber, 5 parts of defoamer, 0.8 parts of sterilizer, 1 part of dispersant, 16 parts of latex paint and 50 parts of deionized water.

3. The noise reduction coating for sound barrier panels according to claim 1, characterized in that: The ultraviolet light absorber is selected from one of UV-531, UV-9 and UV-234.

4. The noise reduction coating for sound barrier panels according to claim 1, characterized in that: The sterilizing agent is obtained by mixing 35 wt.% of 1,3-dibromo-2,4-imidazolidinedione and 65 wt.% of sodium pyrithione.

5. The noise reduction coating for sound barrier panels according to claim 1, characterized in that: The dispersant is selected from one of sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate.

6. The noise reduction coating for sound barrier panels according to claim 1, characterized in that: The defoaming agent is dimethyl silicone oil.

7. A method for preparing the noise reduction coating for a sound barrier panel according to any one of claims 1 to 6, comprising the following steps: (1) Adding polyurethane resin, styrene acrylic emulsion and dispersant into deionized water, stirring at a speed of 680-800 r / min for 30-45 min to obtain a mixed solution; (2) adding corresponding amounts of sodium dodecyl sulfate, potassium stearate and carboxymethyl cellulose to the mixed solution of step (1), heating in a water bath, stirring and reacting for 25 to 40 minutes, then adding a mixed powder consisting of quartz sand short fibers, aluminum silicate fibers and nano-titanium dioxide, stirring at room temperature for 15 minutes to obtain a mixed solution; (3) Add latex paint to the mixed solution obtained in step (2), stir for 20 to 30 minutes, then add dimethyl silicone oil, continue stirring for 15 minutes and let stand for 10 to 20 minutes. After the foam is eliminated and there is no adverse reaction, add sterilizer and ultraviolet light absorber, stir slowly and evenly, let stand for 15 minutes, and fill after the solution produces no obvious foam, so as to obtain the noise reduction coating for the sound barrier panel.

8. The preparation method according to claim 7, characterized in that: In the step (2), the water bath heating temperature is 60°C.

9. The preparation method according to claim 7, characterized in that: In the step (2), the mixed powder is prepared by placing the quartz sand short fibers and aluminum silicate fibers into a pulverizer for crushing, then placing the mixed particles into a ball mill for ball milling, and adding nano titanium dioxide after the ball milling, and homogenizing to obtain the mixed powder.

10. The noise reduction coating for sound barrier panels according to claims 1 to 6, characterized in that: The thickness of the sprayed coating on the panel is 2.5 mm.

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