High-performance low-and-medium-frequency environment-friendly flame-retardant composite damping coating and preparation method thereof

Abstract

The invention belongs to the technical field of damping coatings, and particularly relates to a high-performance low-and-medium-frequency environment-friendly flame-retardant composite damping coating and a preparation method thereof. Comprising the following raw material components in parts by weight: 15 to 60 parts of composite damping emulsion, 20 to 100 parts of inorganic filler, 1 to 5 parts of nanofiber, 5 to 25 parts of a flame retardant, 5 to 30 parts of water, 0.05 to 0.3 part of a modifier, 0.1 to 0.5 part of a pH regulator, 0.5 to 3 parts of a dispersant, 0.2 to 0.5 part of a wetting agent, 0.1 to 1.5 parts of an anti-aging agent, 0.2 to 1.5 parts of a defoaming agent, 0.3 to 1.5 parts of an anti-freezing agent and 0.5 to 4 parts of a thickening agent. The sound insulation material has an excellent sound insulation effect on low and medium frequency noise.

Description

Technical Field

[0001] The present invention belongs to the technical field of damping coatings, and particularly relates to a composite damping coating with high performance in medium and low frequencies, environmental protection and flame retardancy, and a preparation method thereof. Background Art

[0002] With the acceleration of the modern industrialization and urbanization processes, the problems of vibration and noise generated by various mechanical equipment, transportation vehicles, and building construction are becoming increasingly serious. These noises not only harm people's physical and mental health, leading to health problems such as hearing loss and neurasthenia, but also affect the accuracy and service life of mechanical products, reducing work efficiency. Therefore, the sound insulation and noise reduction technology has become an important problem that needs to be solved urgently.

[0003] Traditional sound insulation materials such as civil engineering structures and metal surface coatings mostly do not have effective sound insulation and noise reduction functions, or the sound insulation effect is limited and cannot meet the requirements of modern industry for high-efficiency sound insulation. At the same time, some coatings contain harmful substances such as volatile organic compounds such as formaldehyde and benzene, which pose a hazard to human health and the environment and do not meet the environmental protection requirements. In addition, some sound insulation materials also have deficiencies in flame retardancy performance, and there are potential safety hazards such as fires.

[0004] Therefore, it is particularly important to develop a composite sound insulation coating that is both environmentally friendly and highly efficient in sound insulation. At present, there are a variety of sound insulation coatings on the market, but most of them have problems such as limited sound insulation frequency bands, insufficient damping performance, and poor environmental protection performance. Especially for sound insulation coatings for medium and low frequency noises, their sound insulation effect and damping performance still need to be improved. At the same time, the flame retardancy performance is also one of the important indicators for measuring the performance of sound insulation coatings, but the existing coatings still have deficiencies in flame retardancy. Summary of the Invention

[0005] In view of the above problems, the present invention proposes a composite sound insulation coating with high damping in medium and low frequencies, environmental protection and flame retardancy, and its preparation process.

[0006] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose a high-performance composite damping coating with medium and low frequencies, environmental protection and flame retardancy, and a preparation method thereof.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions: The present invention provides a high-performance medium and low-frequency environmentally friendly flame-retardant composite damping coating and a preparation method thereof. In terms of parts by weight, it includes the following raw material components: 15-60 parts of composite damping emulsion, 20-100 parts of inorganic filler, 1-5 parts of nanofibers, 5-25 parts of flame retardant, 5-30 parts of water, 0.05-0.3 parts of modifier, 0.1-0.5 parts of pH regulator, 0.5-3 parts of dispersant, 0.2-0.5 parts of wetting agent, 0.1-1.5 parts of anti-aging agent, 0.2-1.5 parts of defoaming agent, 0.3-1.5 parts of antifreeze, and 0.5-4 parts of thickener; Preferably, the composite damping emulsion is a mixture of at least two emulsions among polyurethane emulsion, polyacrylate emulsion, and epoxy resin emulsion in different proportions.

[0008] Preferably, the inorganic filler is at least one of mica powder, titanium oxide, vermiculite, and wollastonite.

[0009] Preferably, the nanofibers are at least one of polyester fiber, polypropylene fiber, polyethylene fiber, and glass fiber and have a length of 1-5 mm.

[0010] Preferably, the flame retardant includes at least one of flame retardant 6001, flame retardant 6003, flame retardant SFR-3B, aluminum hydroxide, and magnesium hydroxide.

[0011] Preferably, the modifier includes at least one of silane coupling agents A-171, A-174, A-187, and KH-550.

[0012] Preferably, the pH regulator is at least one of 2-amino-2-methyl-1-propanol and dimethylethanolamine.

[0013] Preferably, the defoaming agent is at least one of silicone defoaming agents, metal soap defoaming agents, and mineral oil defoaming agents.

[0014] Preferably, the dispersant is a sodium polyacrylate-based dispersant; the wetting agent is at least one of sodium dodecylbenzenesulfonate, diisooctyl sulfosuccinate, and sodium butylnaphthalenesulfonate; the anti-aging agent includes at least one of antioxidant 2246, antioxidant 168, and antioxidant 4010; the antifreeze is at least one of ethylene glycol and propylene glycol; the thickener is at least one of hydroxyethyl cellulose, polyacrylate thickener, and associative polyurethane thickener.

[0015] Preferably, the high-performance medium and low-frequency environmentally friendly flame-retardant composite damping coating and its preparation method include the following steps: Weigh each raw material according to a certain weight portion, add polyurethane emulsion, polyacrylate emulsion, water, and modifier into a reactor, place it in a heatable high-speed stirrer, and stir and disperse fully for 10 to 45 minutes. The water bath temperature is 25 to 65 °C, and the stirring speed is 200 to 550 r / min; then add a PH regulator, a dispersant, a wetting agent, an anti-aging agent, an antifreeze agent, part of the defoaming agent, and part of the thickener in sequence, and stir and disperse for 5 to 20 minutes; further add inorganic filler, flame retardant, and nanofiber during the stirring process, and continue to stir for 15 to 45 minutes; finally, add the remaining defoaming agent and thickener and continue to stir for 10 to 30 minutes to obtain a high-performance medium and low-frequency environmentally friendly flame-retardant composite damping coating.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The high-performance medium and low-frequency environmentally friendly flame-retardant composite damping coating and its preparation method provided by the present invention have excellent sound insulation effect on medium and low-frequency noise. Among them, the composite damping emulsion forms a cross-linked network structure, and the sound insulation filler is evenly dispersed in the emulsion, significantly improving the damping performance of the coating; in addition, it also has good mechanical properties, flame retardancy, and water resistance, so that the damping coating has good practicability and durability. Specific embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the tables in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the table is not intended to limit the scope of the present invention to be protected, but only represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present invention.

[0018] The present invention provides a high-performance medium and low-frequency environmentally friendly flame-retardant composite damping coating and its preparation method. Calculated by weight portion, it includes the following raw material components: 15 to 60 parts of composite damping emulsion, 20 to 100 parts of inorganic filler, 1 to 5 parts of nanofiber, 5 to 25 parts of flame retardant, 5 to 30 parts of water, 0.05 to 0.3 part of modifier, 0.1 to 0.5 part of PH regulator, 0.5 to 3 parts of dispersant, 0.2 to 0.5 part of wetting agent, 0.1 to 1.5 parts of anti-aging agent, 0.2 to 1.5 parts of defoaming agent, 0.3 to 1.5 parts of antifreeze agent, 0.5 to 4 parts of thickener; Preferably, the composite damping emulsion is a mixture of at least two emulsions selected from polyurethane emulsion, polyacrylate emulsion, and epoxy resin emulsion in different proportions.

[0019] Preferably, the inorganic filler is at least one selected from mica powder, titanium oxide, vermiculite, and wollastonite.

[0020] Preferably, the nanofibers are at least one selected from polyester fiber, polypropylene fiber, polyethylene fiber, and glass fiber, and the length is 1 - 5 mm.

[0021] Preferably, the flame retardant includes at least one selected from flame retardant 6001, flame retardant 6003, flame retardant SFR - 3B, aluminum hydroxide, and magnesium hydroxide.

[0022] Preferably, the modifier includes at least one selected from silane coupling agents A - 171, A - 174, A - 187, and KH - 550.

[0023] Preferably, the pH regulator is at least one selected from 2 - amino - 2 - methyl - 1 - propanol and dimethylethanolamine.

[0024] Preferably, the defoamer is at least one selected from silicone defoamers, metal soap defoamers, and mineral oil defoamers.

[0025] Preferably, the dispersant is a polyacrylate sodium dispersant; the wetting agent is at least one selected from sodium dodecylbenzenesulfonate, diisooctyl sulfosuccinate, and sodium butylnaphthalenesulfonate; the anti - aging agent includes at least one selected from antioxidant 2246, antioxidant 168, and anti - aging agent 4010; the antifreeze is at least one selected from ethylene glycol and propylene glycol; the thickener is at least one selected from hydroxyethyl cellulose, polyacrylate thickener, and associative polyurethane thickener.

[0026] Preferably, for the preparation method of a high - performance medium - low frequency environmentally friendly flame - retardant composite damping coating, the following steps are included: Weigh each raw material according to certain parts by weight. Add polyurethane emulsion, polyacrylate emulsion, water, and modifier into a reactor and place it in a heat - able high - speed stirrer to fully stir and disperse for 10 - 45 min, with the water - bath temperature being 25 - 65°C and the stirring speed being 200 - 550 r / min; then sequentially add pH regulator, dispersant, wetting agent, anti - aging agent, antifreeze, part of the defoamer, and part of the thickener, and stir and disperse for 5 - 20 min; further add inorganic filler, flame retardant, and nanofibers during stirring and continue to stir for 15 - 45 min; finally, add the remaining defoamer and thickener and continue to stir for 10 - 30 min to obtain a high - performance medium - low frequency environmentally friendly flame - retardant composite damping coating.

[0027] To further illustrate the present invention, a high-performance medium-low frequency environmentally friendly flame-retardant composite damping coating provided by the present invention and its preparation method will be described in detail below in combination with tables, examples and comparative examples, but they should not be construed as limiting the protection scope of the present invention.

[0028] For Examples 1 to 3, the raw material ratios were prepared according to the raw material ratios in Table 1; the preparation method included the following steps: Weigh each raw material in certain parts by weight. Add the polyurethane emulsion, polyacrylate emulsion, water, and modifier to a reactor and place it in a heatable high-speed stirrer to fully stir and disperse for 10 to 45 min. The water bath temperature is 25 to 65 °C and the stirring speed is 200 to 550 r / min; then sequentially add the PH regulator, dispersant, wetting agent, anti-aging agent, anti-freezing agent, part of the defoamer, and part of the thickener, and stir and disperse for 5 to 20 min; further add the inorganic filler, flame retardant, and nanofiber during the stirring process, and continue to stir for 15 to 45 min; finally, add the remaining defoamer and thickener and continue to stir for 10 to 30 min to obtain a high-performance medium-low frequency environmentally friendly flame-retardant composite damping coating.

[0029] Table 1 Raw material ratios of Examples 1 to 3

[0030] Perform performance tests on the coatings obtained in Examples 1 to 3 and Comparative Examples 1 to 2: Comparative Example 1 is a damping coating in the domestic existing technology, and Comparative Example 2 is a damping coating in the foreign existing technology.

[0031] The ozone aging performance is carried out in accordance with GB / T 7762-2014; The low-temperature brittleness is carried out in accordance with GB / T 1682-2014; The flame retardancy is carried out in accordance with GB / T 10707-2014; The mold-proof grade is carried out in accordance with HGT / 4301-2012; The sound insulation performance is measured by an AHAI1032 type transfer function method sound insulation measurement system; According to the provisions of GB / T1727, surface treatment is carried out on the test panel, and the coating film is prepared by the scraping method. The dry film thickness of the coating film should be (2.0 ± 0.2) mm. After the coating is completed, the test panel is dried at room temperature (23.5 ± 2) °C for 10 days and then the performance test is carried out; Condensation performance: Apply the anti-condensation damping coating on a metal plate with an area of 60 mm 2 After it is completely dried, place it vertically in an environment with a temperature of 10 °C and a relative humidity of 80%, and observe the condensation situation on the surface after 48 h.

[0032] The obtained test results are shown in Table 2; Table 2 Performance test results of the samples obtained in Examples 1-3 and Comparative Examples 1-2

[0033] As can be seen from Table 2, the coating improved by the present invention has excellent mechanical properties, chemical resistance, flame retardancy and sound insulation performance (mid-low frequency 25-1500 Hz).

[0034] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A high-performance medium and low-frequency environmentally friendly flame-retardant composite damping coating, characterized in that By weight parts, it includes the following raw material components: 15-60 parts of composite damping emulsion, 20-100 parts of inorganic filler, 1-5 parts of nanofiber, 5-25 parts of flame retardant, 5-30 parts of water, 0.05-0.3 part of modifier, 0.1-0.5 part of pH regulator, 0.5-3 parts of dispersant, 0.2-0.5 part of wetting agent, 0.1-1.5 parts of anti-aging agent, 0.2-1.5 parts of defoamer, 0.3-1.5 parts of antifreeze, and 0.5-4 parts of thickener.

2. The high-performance medium-low frequency environmentally friendly flame-retardant composite damping coating according to claim 1, wherein: The composite damping emulsion is a mixture of at least two emulsions among polyurethane emulsion, polyacrylate emulsion, and epoxy resin emulsion.

3. The high-performance medium-low frequency environmentally friendly flame-retardant composite damping coating according to claim 1 and its preparation method are characterized in that, The inorganic filler includes one or more of mica powder, titanium oxide, vermiculite, and wollastonite.

4. The high-performance medium and low-frequency environmentally friendly flame-retardant composite damping coating and its preparation method according to claim 1, characterized in that, The nanofiber includes one or more of polyester fiber, polypropylene fiber, polyethylene fiber, and glass fiber, and its fiber length is 1-5 mm.

5. The high-performance medium and low-frequency environmentally friendly flame-retardant composite damping coating and its preparation method according to claim 1, characterized in that, The flame retardant includes one or more of flame retardant 6001, flame retardant 6003, flame retardant SFR-3B, aluminum hydroxide, and magnesium hydroxide.

6. The high-performance medium and low-frequency environmentally friendly flame-retardant composite damping coating according to claim 1 and its preparation method are characterized in that, The modifier includes one or more of silane coupling agent A-171, silane coupling agent A-174, silane coupling agent A-187, and silane coupling agent KH-550.

7. The high-performance medium and low-frequency environmentally friendly flame-retardant composite damping coating according to claim 1 and its preparation method are characterized in that, The pH regulator includes one or more of 2-amino-2-methyl-1-propanol and dimethylethanolamine.

8. The high-performance medium and low-frequency environmentally friendly flame-retardant composite damping coating according to claim 1 and its preparation method are characterized in that, The defoamer includes one or more of silicone defoamers, metal soap defoamers, and mineral oil defoamers.

9. The high-performance medium-low frequency environmentally friendly flame-retardant composite damping coating and its preparation method according to claim 1, characterized in that, The dispersant is a sodium polyacrylate dispersant; the wetting agent includes one or more of sodium dodecylbenzenesulfonate, diisooctyl sulfosuccinate, and sodium butylnaphthalenesulfonate; The anti-aging agent includes one or more of antioxidant 2246, antioxidant 168, and anti-aging agent 4010; The antifreeze includes one or more of ethylene glycol and propylene glycol; The thickener includes one or more of hydroxyethyl cellulose, polyacrylate thickener, and associative polyurethane thickener.

10. A high-performance mid-low frequency environmentally friendly flame-retardant composite damping coating as described in claims 1 to 9 and its preparation method, characterized in that, It includes the following steps: S1. Weigh each raw material by weight parts. Add polyurethane emulsion, polyacrylate emulsion, water, and modifier into a reactor and place it in a heatable high-speed stirrer to fully stir and disperse for 10-45 min. The water bath temperature is 25-65°C, and the stirring speed is 200-550 r / min; S2. Then, add the pH regulator, dispersant, wetting agent, anti-aging agent, antifreeze, part of the defoamer, and part of the thickener in sequence, and stir and disperse for 5-20 min; S3. Further add the inorganic filler, flame retardant, and nanofiber during the stirring process, and continue to stir for 15-45 min; S4. Finally, add the remaining defoamer and thickener and continue to stir for 10-30 min to obtain a high-performance medium and low-frequency environmentally friendly flame-retardant composite damping coating.

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