CN115181489B

CN115181489B - Sound-absorbing coating and preparation method and application thereof

Info

Publication number: CN115181489B
Application number: CN202210920396.6A
Authority: CN
Inventors: 吕艳琴; 裴道海; 李金钟
Original assignee: ASIA PAINT (SHANGHAI) CO LTD
Current assignee: ASIA PAINT (SHANGHAI) CO LTD
Priority date: 2022-08-02
Filing date: 2022-08-02
Publication date: 2023-07-21
Anticipated expiration: 2042-08-02
Also published as: CN115181489A

Abstract

The invention provides a sound-absorbing coating, and a preparation method and application thereof. The sound-absorbing coating comprises, by weight, 10-25 parts of hybrid emulsion and 20-40 parts of polyurethane graphene-silica aerogel. The preparation method of the sound-absorbing paint comprises the following steps: and mixing the hybrid emulsion with polyurethane graphene-silicon dioxide aerogel to obtain the sound-absorbing coating. According to the sound-absorbing coating provided by the invention, through compounding the hybridized emulsion with specific content and the polyurethane graphene-silicon dioxide aerogel, the sound-absorbing coating has the advantages of excellent sound-absorbing and noise-reducing functions, good antibacterial and mildew-proof effects, high flame-retardant grade, no need of adding an antibacterial agent or a flame retardant, environmental friendliness, simple preparation process and low cost.

Description

Sound-absorbing coating and preparation method and application thereof

Technical Field

The invention belongs to the technical field of coatings, and particularly relates to a sound-absorbing coating and a preparation method and application thereof.

Background

Along with the rapid development of the economy of China and the rapid improvement of the living standard of people, the environmental protection consciousness of the whole society is also enhanced. Environmental-friendly new technologies and new materials are receiving more and more attention. In various fields, healthier and more environment-friendly materials are eliminating the lag technology of high pollution and high energy consumption. The social concern about noise pollution is an obvious example, which is considered to be the third greatest nuisance next to atmospheric pollution and water pollution. Many enterprises grasp trends and rapidly put them into the application research of noise control. The traditional sound absorption method generally comprises the steps of coating materials such as sound absorption cotton, sound absorption boards and the like, and the method enhances the sound absorption effect of the structure on the basis of not changing the decoration effect, but the decoration is high in cost and is particularly easy to damage. And the sound-absorbing paint has low cost and easy processing and is widely focused. And sound absorbing paint is most suitable for places with strong decoration and need of sound absorption, such as theatres, venues, shops, houses, villas, hotels and the like.

Most of the existing sound-absorbing paint uses acrylic emulsion as a film-forming substance, however, the surface of the film is possibly affected by harmful microorganisms such as bacteria and mould, so that the film is discolored, pulverized and shed, and the sound-absorbing paint is more easily pulverized and shed due to large surface area and poor smoothness; in addition, if harmful microorganisms exist on the surface of the coating film, various diseases can be transmitted after the coating film contacts with a human body, and the health of the human body is threatened; however, the metal ions are easily released into the environment to threaten aquatic organisms, and the copper ions are used, so that the coating film is easy to change color and has high cost; another class of antimicrobial agents are quaternary ammonium compounds, but quaternary ammonium salts remain on the surface of the film coating, which can cause pulmonary irritation and asthma and other respiratory problems when in contact with the human body.

For example, CN113736321a discloses a sound absorbing paint and a preparation method thereof. The sound-absorbing coating comprises emulsion, titanium dioxide, fiber, filler, flame retardant, cellulose, auxiliary agent and water; the sound-absorbing paint is compounded by emulsion, filler, fiber and other components, so that the sound-absorbing paint has the effects of sound absorption, heat preservation and fire prevention. Although aluminum hydroxide flame retardant is added in the sound-absorbing paint, the flame retardant effect is still to be further improved; and the sound-absorbing paint is an aqueous emulsion paint and has poor antibacterial and mildew-proof properties.

For example, CN105838164a discloses a water-based nano antibacterial sound absorbing paint comprising acrylic resin emulsion, water-based nano silver antibacterial agent, titanium pigment, filler, expanded perlite, auxiliary agent and water. The sound-absorbing paint has the special effects of resisting bacteria, inhibiting mold, purifying organic matters and peculiar smell in the air. However, the sound absorbing effect of the sound absorbing paint is to be further improved, and metal ions are easily released into the environment to threaten aquatic organisms.

Therefore, development of a coating with good sound absorption effect, high antibacterial and mildew-proof grade and high flame retardant grade, health and environment friendliness is a problem to be solved in the field.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention aims to provide the sound-absorbing paint, the preparation method and the application thereof, and the sound-absorbing paint is compounded by the hybridized emulsion with specific content and the polyurethane graphene-silicon dioxide aerogel, so that the sound-absorbing paint has excellent sound-absorbing and noise-reducing functions, good antibacterial and mildew-proof effects, high flame-retardant grade, no need of adding an antibacterial agent or a flame retardant, and environmental protection.

To achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides a sound-absorbing coating, which comprises, by weight, 10-25 parts of a hybrid emulsion and 20-40 parts of polyurethane graphene-silica aerogel.

According to the invention, the polyurethane graphene-silica aerogel is introduced into the sound-absorbing paint, so that the micropore structure in the sound-absorbing paint is greatly increased, the coating has super sound-absorbing capacity, and the gaps and cavities in the paint are further increased by combining the hybrid emulsion with the polyurethane graphene-silica aerogel; the sound wave shuttles between the tiny holes and the bubbles, friction is generated between the sound wave and the hole wall due to vibration of the sound wave, and partial sound energy is finally converted into heat energy to be consumed, so that the sound absorption effect is greatly improved.

Preferably, the sound absorbing coating comprises 10 to 25 parts by weight of the hybrid emulsion, for example, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, and the like.

Preferably, the sound absorbing coating comprises 20 to 40 parts by weight of polyurethane graphene-silica aerogel, and for example, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts and the like.

According to the invention, the hybrid emulsion is compounded with the polyurethane graphene-silicon dioxide aerogel in a specific content, so that the sound absorption performance of the sound absorption coating is better; the hybrid emulsion or the polyurethane graphene-silicon dioxide aerogel has too much or too little content, and the sound absorption effect is poor.

Preferably, the hybrid emulsion comprises an organic-inorganic hybrid emulsion.

Preferably, the organic-inorganic hybrid emulsion is a hybrid emulsion having a microporous structure.

Preferably, the pH value of the organic-inorganic hybrid emulsion is 11-12.

Preferably, the organic-inorganic hybrid emulsion has a core-shell structure with an inorganic phase as a core and an organic phase as a shell.

Preferably, the inorganic phase material in the organic-inorganic hybrid emulsion comprises at least one of silica, titania, zinc oxide, or calcium carbonate.

Preferably, the organic phase material in the organic-inorganic hybrid emulsion comprises at least one of polyurethane, polyacrylate, polyaniline or polydimethylsiloxane.

In the invention, the organic-inorganic hybrid emulsion with a core-shell structure and a micropore structure is selected, and an inorganic core is taken as a reticular structure and added with an organic matter chain segment of a surface macromolecule, so that the emulsion is rich in a plurality of micro voids, meanwhile, the sound-absorbing coating has a higher pH value due to stronger alkalinity of inorganic matters, and protein cells of microorganisms can be denatured under a high-alkali condition, viruses and bacteria can not survive finally, and the antibacterial and mildew-proof performances of the sound-absorbing coating are improved. Meanwhile, the micropore structure increases the gaps of the coating film, the gaps and the cavities can absorb the vibration transmission energy, and the transmission of sound waves is blocked, so that the sound absorption effect of the sound absorption coating is further increased.

In the invention, the alkalinity of the organic-inorganic hybrid emulsion is not easy to be too strong, namely the pH value is not easy to be too high, when the pH value is more than 12, the emulsion belongs to dangerous chemicals, and in addition, the pH value of the emulsion is very high, the emulsion is easy to react with an auxiliary agent containing ammonia to play a side effect.

Preferably, the raw materials of the polyurethane graphene-silica aerogel comprise polyurethane graphene and a silicon source.

Preferably, the mass ratio of the polyurethane graphene to the silicon source is (0.5-2.5): 1, for example, may be 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1, 2.1:1, 2.2:1, 2.3:1, etc.

In the invention, the mass ratio of the polyurethane graphene to the silicon source is in a specific range, and the sound absorption effect of the sound absorption paint is better.

In the present invention, the silicon source includes, but is not limited to, ethyl orthosilicate.

Preferably, the raw materials of the polyurethane graphene comprise polyisocyanate and hydroxylated graphene.

Preferably, the mass ratio of the polyisocyanate to the hydroxylated graphene is (1-3): 1, and for example, may be 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1, 2.1:1, 2.2:1, 2.3:1, 2.4:1, 2.5:1, 2.6:1, 2.7:1, 2.8:1, etc.

Preferably, the polyisocyanate includes at least one of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, or lysine diisocyanate.

In the invention, the polyurethane graphene-silicon dioxide aerogel is prepared by adopting the following method, wherein the method comprises the following steps of:

(1) Reacting polyisocyanate with hydroxylated graphene to obtain polyurethane graphene;

(2) Taking a silicon source as a precursor, and performing hydrolytic condensation to obtain silica gel; and (2) then, reacting the silica gel with the polyurethane graphene obtained in the step (1), and drying to obtain the polyurethane graphene-silica aerogel.

Preferably, the reaction of step (1) is carried out in the presence of a catalyst.

Preferably, the catalyst comprises triethylamine or potassium hydroxide.

Preferably, the temperature of the reaction in the step (1) is 75 to 85℃and may be, for example, 76℃78 ℃, 80 ℃, 82 ℃, 84℃or the like.

Preferably, the reaction time in step (1) is 3 to 5 hours, for example, 3.5 hours, 4 hours, 4.5 hours.

Preferably, the reaction in the step (1) further comprises a step of heat preservation.

Preferably, the time for the heat preservation is 20 to 40min, for example, 25min, 30min, 35min, etc.

Preferably, the specific step of obtaining silica gel in step (2) includes: dissolving tetraethoxysilane by acid to obtain silicic acid solution; adding alkali into the silicic acid solution, stirring, and standing to obtain the silica gel.

Preferably, the acid-soluble ethyl orthosilicate maintains a pH of 1 to 2.

Preferably, a base is added to the silicic acid solution to adjust the pH to 5 to 6.

Preferably, the stirring time is 40 to 80 seconds, for example, 50 seconds, 60 seconds, 70 seconds, or the like.

Preferably, the silica gel obtained further comprises the steps of standing aging and solvent replacement.

Preferably, the aging time is 22 to 26 hours, for example, 23 hours, 24 hours, 25 hours, etc.

Preferably, the solvent displacement comprises soaking the aged gel in butyl ester.

Preferably, the soaking time is 22-26 h, for example, 23h, 24h, 25h, etc.

In the invention, in the solvent replacement process, the butyl ester solvent is replaced every 6-8 hours.

Preferably, the temperature of the reaction in the step (2) is 75 to 85℃and may be, for example, 76℃78 ℃, 80 ℃, 82 ℃, 84℃or the like.

Preferably, the reaction time in step (2) is 3 to 5 hours, for example, 3.5 hours, 4 hours, 4.5 hours.

Preferably, the reaction in the step (2) further comprises a step of heat preservation.

Preferably, in the step (2), the time of the heat preservation is 20-40 min, for example, 25min, 30min, 35min, etc.

Preferably, the drying in step (2) includes room temperature drying and vacuum drying.

Preferably, the room temperature drying time is 22 to 26 hours, for example, 23 hours, 24 hours, 25 hours, etc.

Preferably, the time for vacuum drying is 22 to 26 hours, for example, 23 hours, 24 hours, 25 hours, or the like.

Preferably, the sound absorbing paint further includes 0.1 to 0.5 part of cellulose, for example, 0.1 part, 0.2 part, 0.3 part, 0.4 part, etc., in terms of parts by weight.

Preferably, the cellulose comprises hydroxyethyl cellulose.

Preferably, the sound absorbing paint further comprises 15 to 25 parts by weight of a first filler, for example, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, etc.

Preferably, the first filler comprises at least one of kaolin, heavy calcium, talc or mica powder.

Preferably, the first filler comprises a combination of kaolin clay and heavy calcium.

Preferably, the mass ratio of the kaolin to the heavy calcium in the first filler is 1 (1.5-4.5), for example, 1:1.6, 1:1.8, 1:2, 1:2.2, 1:2.4, 1:2.6, 1:2.8, 1:3, 1:3.2, 1:3.4, 1:3.6, 1:3.8, 1:4, 1:4.2, and the like.

In the invention, the first filler is selected from the combination of kaolin and heavy calcium, and the kaolin and heavy calcium are in a specific proportion, so that the coating has good appearance.

Preferably, the sound absorbing paint further includes 0.4 to 1 part of a dispersant, for example, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, etc., in terms of parts by weight.

Preferably, the dispersant comprises a modified polyacrylic dispersant and/or a modified polycarboxylate dispersant.

Preferably, the sound absorbing paint further includes 0.1 to 0.5 part of a wetting agent, for example, 0.1 part, 0.2 part, 0.3 part, 0.4 part, etc., in terms of parts by weight.

Preferably, the wetting agent comprises at least one of polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether, polyoxyethylene-polyoxypropylene block copolymer.

Preferably, the sound absorbing paint further includes 0.1 to 0.5 part of an antifoaming agent, for example, 0.1 part, 0.2 part, 0.3 part, 0.4 part, etc., in terms of parts by weight.

Preferably, the defoamer comprises a polysiloxane and/or a polyether modified polysiloxane.

Preferably, the sound absorbing paint further includes 0.05 to 2 parts by weight of a thickener, for example, 0.1 part, 0.2 part, 0.4 part, 0.6 part, 0.8 part, 1 part, 1.2 part, 1.4 part, 1.6 part, 1.8 part, etc.

Preferably, the sound absorbing paint further comprises 5 to 20 parts of pigment filler, for example, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, etc., in parts by weight.

Preferably, the pigment filler comprises titanium dioxide.

Preferably, the solid content of the sound absorbing paint is 65 to 95%, for example, 66%, 68%, 70%, 75%, 80%, 85%, 90%, 92%, 94%, etc.

In a second aspect, the present invention provides a method for preparing the sound-absorbing paint according to the first aspect, the method comprising:

and mixing the hybrid emulsion with polyurethane graphene-silicon dioxide aerogel to obtain the sound-absorbing coating.

Preferably, the mixed material further comprises at least one of cellulose, a first filler, a dispersant, a wetting agent, an antifoaming agent, a thickener or a pigment filler.

Preferably, the mixing is performed in a solvent.

Preferably, the solvent comprises water.

Preferably, the preparation method of the sound-absorbing paint comprises the following steps:

(1) Mixing a solvent with optional cellulose, a dispersant, a wetting agent or an antifoaming agent to obtain a dispersion;

(2) Mixing the dispersion of step (1) with optional pigment and/or first filler to obtain a stable liquid;

(3) Mixing the stabilizing solution obtained in the step (2) with the hybrid emulsion, the polyurethane graphene-silica gel and an optional defoamer to obtain a primary product solution;

(4) And (3) mixing the primary product liquid in the step (3) with an optional thickener and/or solvent to obtain the sound-absorbing coating.

Preferably, the mixing time in the step (2) is 20 to 40min, for example, 25min, 30min, 35min, etc.

In a third aspect, the present invention provides a use of the sound-absorbing coating according to the first aspect for sound absorption and noise reduction.

The numerical ranges recited herein include not only the recited point values, but also any point values between the recited numerical ranges that are not recited, and are limited to, and for the sake of brevity, the invention is not intended to be exhaustive of the specific point values that the recited range includes.

Compared with the prior art, the invention has the beneficial effects that:

according to the sound-absorbing coating provided by the invention, through compounding of the hybridized emulsion with specific content and the polyurethane graphene-silicon dioxide aerogel, the sound-absorbing coating is excellent in sound-absorbing and noise-reducing functions, good in antibacterial and mildew-proof effects, high in flame-retardant level, safer and durable, and does not need to be additionally added with an antibacterial agent and a flame retardant; the method does not need to create a living environment without allergy by using the bactericide in the tank, has low cost and simple preparation process, is favorable for large-scale production and is more environment-friendly.

Detailed Description

The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.

In the present invention, all the materials used for the preparation examples, examples and comparative examples were as follows, unless otherwise specified:

organic-inorganic hybrid emulsion: basoff' sEDGE 7073

Organic-inorganic hybrid emulsion (without microporous structure): pasteur Acronal PLUS7602

Cellulose: music day B30K

Dispersing agent: french Gaotai chemical ECODIS P30

Wetting agent: AH-100 of Bulai Ke

Defoaming agent: BYK0245 from Pick chemical Co., germany

Titanium white powder: 699 rutile titanium dioxide of python

And (3) a thickening agent: le Shun of Dow chemical Co ^TM ASE-60

Hydroxylated graphene: nanjing Jicang nanotechnology Co.Ltd JCG-1-3-OH

Common odor-free emulsion: badbafil RS-8120 emulsion

Hollow glass beads: hebei Yi Ming Kogyo Co Ltd YL-253

Preparation example 1

The polyurethane graphene-silicon dioxide aerogel comprises, by weight, 6.1 parts of polyurethane graphene and 3.76 parts of tetraethoxysilane; the raw materials of the polyurethane graphene comprise 4 parts of isophorone diisocyanate and 2 parts of hydroxylated graphene.

The preparation method of the polyurethane graphene-silicon dioxide aerogel specifically comprises the following steps:

(1) Adding isophorone diisocyanate, hydroxylated graphene and 0.1 part of triethylamine into a reaction kettle, heating to 80 ℃, reacting for 4 hours, and preserving heat for 30 minutes to obtain polyurethane graphene;

(2) Diluting ethyl orthosilicate serving as a precursor with deionized water according to a volume ratio of 3:1, fully stirring, adding hydrochloric acid for dissolution to obtain a silicic acid solution, controlling the pH value to be 1-2, and washing out impurities with water; then adding 1mol/L ammonia water solution, regulating the pH of the silicic acid solution to be 5-6, stirring for 1min, pouring into a mould, standing at room temperature to convert the silicic acid solution into gel, standing and aging for 24h, taking out and transferring the gel into butyl ester solution, and soaking for 24h, wherein the butyl ester solution is replaced every 8 h; and (2) adding the polyurethane graphene obtained in the step (1), adding 0.1 part of triethylamine, heating to 80 ℃, reacting for 4 hours, preserving heat for 30 minutes, drying at room temperature for 24 hours, and then drying at 50% in vacuum for 24 hours to obtain the polyurethane graphene-silicon dioxide aerogel.

Preparation example 2

The polyurethane graphene-silicon dioxide aerogel comprises, by weight, 5 parts of polyurethane graphene and 4.86 parts of tetraethoxysilane; the raw materials of the polyurethane graphene comprise 3.6 parts of isophorone diisocyanate and 2.4 parts of hydroxylated graphene.

The preparation method of the polyurethane graphene-silicon dioxide aerogel comprises the specific steps as in preparation example 1.

Preparation example 3

The polyurethane graphene-silicon dioxide aerogel comprises, by weight, 6.8 parts of polyurethane graphene and 3.06 parts of tetraethoxysilane; the raw materials of the polyurethane graphene comprise 4.5 parts of hexamethylene diisocyanate and 1.5 parts of hydroxylated graphene.

Preparation example 4

The polyurethane graphene-silicon dioxide aerogel is different from preparation example 1 only in that the total amount of the polyurethane graphene and the tetraethoxysilane is unchanged, the mass ratio is 0.4:1, and other components, the use amounts and the preparation method are the same as those of preparation example 1.

Preparation example 5

The polyurethane graphene-silicon dioxide aerogel is different from preparation example 1 only in that the total amount of the polyurethane graphene and the tetraethoxysilane is unchanged, the mass ratio is 3:1, and other components, the use amounts and the preparation method are the same as those of preparation example 1.

Preparation example 6

The polyurethane graphene-silicon dioxide aerogel is different from preparation example 1 only in that the total amount of isophorone diisocyanate and hydroxylated graphene is unchanged, the mass ratio is 4:1, and other components, the use amount and the preparation method are the same as those of preparation example 1.

Preparation example 7

The polyurethane graphene-silicon dioxide aerogel is different from preparation example 1 only in that the total amount of isophorone diisocyanate and hydroxylated graphene is unchanged, the mass ratio is 0.8:1, and other components, the use amount and the preparation method are the same as those of preparation example 1.

Preparation example 8

The graphene-silica aerogel differs from preparation example 1 only in that in the preparation method, step (1) is not performed, and in step (2), the polyurethane graphene is replaced by the hydroxyl graphene, and other raw materials, amounts and parameters are the same as those in preparation example 1.

Preparation example 9

The polyurethane-silica aerogel differs from preparation example 1 only in that in the preparation method, the hydroxylated graphene is replaced by organosiloxane diol (Xinglong up 209) in step (1), and other raw materials, amounts and parameters are the same as those of preparation example 1.

Preparation example 10

The silica aerogel is different from the preparation example 1 only in that in the preparation method, the step (1) is not performed, the polyurethane graphene obtained in the step (1) is not added in the step (2) for reaction, and the silica aerogel is obtained by drying, and other raw materials, the use amounts and the parameters are the same as those of the preparation example 1.

Example 1

The embodiment provides a sound-absorbing coating, which comprises, by weight, 20 parts of an organic-inorganic hybrid emulsion, 30 parts of polyurethane graphene-silica aerogel (preparation example 1), 0.2 part of hydroxyethyl cellulose ether, 5 parts of calcined kaolin, 15 parts of heavy calcium carbonate, 10 parts of rutile type titanium dioxide, 0.2 part of a dispersing agent, 0.2 part of a wetting agent, 0.2 part of a defoaming agent, 0.5 part of a thickening agent and water; the solid content of the sound-absorbing paint is 81.3%.

The embodiment provides a preparation method of the sound-absorbing paint, which comprises the following specific steps:

(1) Mixing hydroxyethyl cellulose ether, a dispersing agent, a wetting agent and a defoaming agent with water, and uniformly stirring to obtain a dispersion liquid;

(2) Stirring the dispersion liquid obtained in the step (1) with rutile type titanium dioxide, calcined kaolin and heavy calcium carbonate at a high speed for 30min to obtain a stable liquid;

(3) Mixing the stabilizing solution obtained in the step (2) with the organic-inorganic hybrid emulsion, the polyurethane graphene-silicon dioxide aerogel and the defoamer in a stirring state, and uniformly stirring to obtain a primary product solution;

(4) And (3) mixing the primary product liquid in the step (3), a thickening agent and water, adjusting the viscosity, and uniformly stirring to obtain the sound-absorbing coating.

Example 2

The embodiment provides a sound-absorbing coating, which comprises, by weight, 20 parts of an organic-inorganic hybrid emulsion, 20 parts of polyurethane graphene-silica aerogel (preparation example 2), 0.2 part of hydroxyethyl cellulose ether, 5 parts of calcined kaolin, 15 parts of heavy calcium carbonate, 10 parts of rutile type titanium dioxide, 0.2 part of a dispersing agent, 0.2 part of a wetting agent, 0.2 part of a defoaming agent, 0.5 part of a thickening agent and water; the solid content of the sound-absorbing paint is 71.3%.

This example provides a method for preparing the sound-absorbing paint, and the specific steps are the same as those of example 1.

Example 3

The embodiment provides a sound-absorbing coating, which comprises, by weight, 20 parts of an organic-inorganic hybrid emulsion, 40 parts of polyurethane graphene-silica aerogel (preparation example 3), 0.2 part of hydroxyethyl cellulose ether, 5 parts of calcined kaolin, 15 parts of heavy calcium carbonate, 10 parts of rutile type titanium dioxide, 0.2 part of a dispersing agent, 0.2 part of a wetting agent, 0.2 part of a defoaming agent, 0.5 part of a thickening agent and water; the solid content of the sound-absorbing paint is 91.3%.

Example 4

The embodiment provides a sound-absorbing coating, which comprises, by weight, 20 parts of an organic-inorganic hybrid emulsion, 35 parts of polyurethane graphene-silica aerogel (preparation example 1), 0.2 part of hydroxyethyl cellulose ether, 5 parts of calcined kaolin, 15 parts of heavy calcium carbonate, 10 parts of rutile type titanium dioxide, 0.2 part of a dispersing agent, 0.2 part of a wetting agent, 0.2 part of a defoaming agent, 0.5 part of a thickening agent and water; the solid content of the sound-absorbing paint is 86.3%.

Example 5

The embodiment provides a sound-absorbing coating, which comprises, by weight, 15 parts of an organic-inorganic hybrid emulsion, 38 parts of polyurethane graphene-silica aerogel (preparation example 1), 0.2 part of hydroxyethyl cellulose ether, 5 parts of calcined kaolin, 10 parts of heavy calcium carbonate, 15 parts of rutile type titanium dioxide, 0.2 part of a dispersing agent, 0.2 part of a wetting agent, 0.2 part of a defoaming agent, 0.5 part of a thickening agent and water; the solid content of the sound-absorbing paint is 84.3%.

Example 6

This example provides a sound absorbing coating which differs from example 1 only in that the polyurethane graphene-silica aerogel provided in preparation example 4 is a polyurethane graphene-silica aerogel, and other components, amounts and preparation methods are the same as in example 1.

Example 7

This example provides a sound absorbing coating which differs from example 1 only in that the polyurethane graphene-silica aerogel provided in preparation example 5 is a polyurethane graphene-silica aerogel, and other components, amounts and preparation methods are the same as in example 1.

Example 8

This example provides a sound absorbing coating which differs from example 1 only in that the polyurethane graphene-silica aerogel provided in preparation example 6 is a polyurethane graphene-silica aerogel, and other components, amounts and preparation methods are the same as in example 1.

Example 9

This example provides a sound absorbing coating which differs from example 1 only in that the polyurethane graphene-silica aerogel provided in preparation example 7 is a polyurethane graphene-silica aerogel, and other components, amounts and preparation methods are the same as in example 1.

Example 10

This example provides a sound absorbing coating which differs from example 1 only in that the organic-inorganic hybrid emulsion is replaced by a common odor-free emulsion, and other components, amounts and preparation methods are the same as in example 1.

Example 11

This example provides a sound-absorbing coating which differs from example 1 only in that the organic-inorganic hybrid emulsion is replaced with an organic-inorganic hybrid emulsion without a microporous structure (basf Acronal PLUS 7602), and other components, amounts and preparation methods are the same as in example 1.

Comparative example 1

This comparative example provides a sound absorbing coating which differs from example 1 only in that the polyurethane graphene-silica aerogel is replaced with the graphene-silica aerogel provided in preparation example 8, and other components, amounts and preparation methods are the same as example 1.

Comparative example 2

This comparative example provides a sound absorbing coating which differs from example 1 only in that the polyurethane graphene-silica aerogel is replaced with polyurethane graphene provided in preparation example 1, and other components, amounts and preparation methods are the same as in example 1.

Comparative example 3

This comparative example provides a sound absorbing coating which differs from example 1 only in that the polyurethane graphene-silica aerogel is replaced with the polyurethane-silica aerogel provided in preparation example 9, and other components, amounts and preparation methods are the same as example 1.

Comparative example 4

This comparative example provides a sound absorbing coating which differs from example 1 only in that the polyurethane graphene-silica aerogel is replaced with the silica aerogel provided in preparation example 10, and other components, amounts and preparation methods are the same as in example 1.

Comparative example 5

This comparative example provides a sound-absorbing coating which differs from example 1 only in that the polyurethane graphene-silica aerogel is replaced with hollow glass microspheres, and other components, amounts and preparation methods are the same as in example 1.

Comparative example 6

This comparative example provides a sound-absorbing coating which differs from example 1 only in that the sound-absorbing coating comprises 5 parts of organic-inorganic hybrid emulsion, 45 parts of polyurethane graphene-silica aerogel, and the other components, amounts and preparation methods are the same as example 1.

Comparative example 7

This comparative example provides a sound-absorbing coating which differs from example 1 only in that the sound-absorbing coating comprises 35 parts of organic-inorganic hybrid emulsion, 15 parts of polyurethane graphene-silica aerogel, and other components, amounts and preparation methods are the same as example 1.

Comparative example 8

This comparative example provides a sound-absorbing coating which differs from example 1 only in that the sound-absorbing coating comprises 50 parts of an organic-inorganic hybrid emulsion, no polyurethane graphene-silica aerogel, and other components, amounts and preparation methods are the same as example 1.

Performance testing

(1) Antibacterial properties: the test standard is HG/T3950-2007;

wherein, I level: the antibacterial rate is more than or equal to 99 percent, and the grade II is as follows: the antibacterial rate is more than or equal to 90% and less than 99%, and the grade III is as follows: the antibacterial rate is less than 90 percent;

(2) Mildew resistance: the test standard is GB/T1741-2007;

wherein, level 0: about 50 times of amplification without obvious mould growth;

stage 1: the mildew can not be seen or is difficult to be seen by the naked eye, but the mildew can be obviously seen under a magnifying glass;

2 stages: the mildew is obviously seen by naked eyes, and the coverage area on the surface of the sample is 10-30%;

3 stages: the mildew is obviously seen by naked eyes, and the coverage area on the surface of the sample is 30-60%;

4 stages: the mildew is obviously seen by naked eyes, and the coverage area on the surface of the sample is more than 60%;

(3) Flame retardant rating: the test standard is GB 8624-2012;

(4) Sound absorption and noise reduction performance: the test standard is GB/T20247-2006, acoustic reverberant Chamber Sound absorption measurement;

wherein, the larger the sound absorption coefficient is, the better the sound absorption and noise reduction performance is.

The specific test results are shown in table 1:

TABLE 1

	Antibacterial grade	Mildew resistant grade	Flame retardant rating	Sound absorption coefficient
					Example 1	Class I	Level 0	A1	0.62
Example 2	Class I	Level 0	A1	0.57
					Example 3	Class I	Level 0	A1	0.75
Example 4	Class I	Level 0	A1	0.69
					Example 5	Class II	Level 0	A1	0.63
Example 6	Class I	Level 0	A2	0.5
					Example 7	Class I	Level 0	A2	0.45
Example 8	Class I	Level 0	A2	0.48
					Example 9	Class I	Level 0	A2	0.45
Example 10	Class III	Level 2	A2	0.43
					Example 11	Class III	Level 2	A1	0.44
Comparative example 1	Class I	Level 0	A2	0.40
					Comparative example 2	Class I	Level 0	B1	0.38
Comparative example 3	Class I	Level 0	B1	0.4
					Comparative example 4	Class I	Level 0	B1	0.41
Comparative example 5	Class I	Level 0	B1	0.36
					Comparative example 6	Class III	Level 2	A1	0.51
Comparative example 7	Class I	Level 0	A2	0.46
					Comparative example 8	Class I	Level 0	B2	0.35

As can be seen from the table, the sound-absorbing paint provided by the invention is compounded by the hybridized emulsion with specific content and the polyurethane graphene-silicon dioxide aerogel, so that the sound-absorbing paint has the advantages of excellent sound-absorbing and noise-reducing functions, good antibacterial and mildew-proof effects, high flame-retardant grade, no need of adding an antibacterial agent or a flame retardant, and environmental protection. As can be seen from examples 1 to 5, the antibacterial grade of the sound-absorbing paint reaches grade II and above, the mildew-proof grade reaches grade 0, the antibacterial rate is more than or equal to 90%, and no obvious mildew is generated; the flame retardant grade is high, reaches A1 grade, has a sound absorption coefficient of 0.57-0.75, and has excellent sound absorption and noise reduction functions.

As is clear from comparison of examples 1 and examples 6 to 9, when the raw materials of the polyurethane graphene-silica aerogel are not in a specific ratio, the flame retardant rating of the sound-absorbing paint is lowered and the sound-absorbing effect is poor; as is clear from a comparison of example 1 with examples 10 and 11, the organic-inorganic hybrid emulsion is replaced with a general odor-free emulsion or has no microporous structure, and the sound-absorbing coating has poor antibacterial and mildew-proof effects, reduced flame retardant level and poor sound-absorbing effects; as is clear from comparison of example 1 with comparative examples 1 to 5, the polyurethane graphene-silica aerogel is replaced by other aerogel or glass beads, the sound absorption effect of the sound absorption coating is poor, and the flame retardant rating is low; as is clear from the comparison of example 1 with comparative examples 6 to 8, the organic-inorganic hybrid emulsion and the urethane graphene-silica aerogel are not specific in content or have no urethane graphene-silica aerogel, and the sound-absorbing coating is reduced in flame retardant rating and poor in sound-absorbing effect.

In summary, according to the sound-absorbing coating provided by the invention, through compounding of the hybridized emulsion with specific types and content and the polyurethane graphene-silicon dioxide aerogel, the sound-absorbing coating is excellent in sound-absorbing and noise-reducing functions, good in antibacterial and mildew-proof effects, high in flame-retardant level, safer and durable, and no additional antibacterial agent or flame retardant is needed; the method does not need to create a living environment without allergy by using the bactericide in the tank, has low cost and simple preparation process, is favorable for large-scale production and is more environment-friendly.

While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.

Claims

1. The sound-absorbing coating is characterized by comprising, by weight, 10-25 parts of hybrid emulsion and 20-40 parts of polyurethane graphene-silica aerogel;

the raw materials of the polyurethane graphene-silicon dioxide aerogel comprise polyurethane graphene and a silicon source;

the mass ratio of the polyurethane graphene to the silicon source is (0.5-2.5): 1;

the raw materials of the polyurethane graphene comprise polyisocyanate and hydroxylated graphene;

the mass ratio of the polyisocyanate to the hydroxylated graphene is (1-3) 1;

the hybrid emulsion comprises an organic-inorganic hybrid emulsion;

the organic-inorganic hybrid emulsion comprises a hybrid emulsion with a microporous structure;

the organic-inorganic hybrid emulsion has a core-shell structure with an inorganic phase as a core and an organic phase as a shell;

the inorganic phase material in the organic-inorganic hybrid emulsion comprises at least one of silicon dioxide, titanium dioxide, zinc oxide or calcium carbonate;

the organic phase material in the organic-inorganic hybrid emulsion comprises at least one of polyurethane, polyacrylate, polyaniline or polydimethylsiloxane;

the polyurethane graphene-silicon dioxide aerogel is prepared by the following method, which comprises the following steps:

2. The sound absorbing coating according to claim 1, wherein the pH value of the organic-inorganic hybrid emulsion is 11 to 12.

3. The sound absorbing coating of claim 1, wherein the polyisocyanate comprises at least one of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, or lysine diisocyanate.

4. The sound-absorbing paint according to claim 1, further comprising 0.1 to 0.5 parts by weight of cellulose;

the cellulose comprises hydroxyethyl cellulose.

5. The sound-absorbing paint according to claim 1, further comprising 15-25 parts by weight of a first filler;

the first filler comprises at least one of kaolin, heavy calcium, talcum powder or mica powder.

6. The sound absorbing coating of claim 5, wherein the first filler comprises a combination of kaolin clay and heavy calcium;

the mass ratio of the kaolin to the heavy calcium in the first filler is 1 (1.5-4.5).

7. The sound-absorbing paint according to claim 1, further comprising 0.4-1 part by weight of a dispersant;

the dispersant comprises a modified polyacrylic dispersant and/or a modified polycarboxylate dispersant.

8. The sound-absorbing paint according to claim 1, further comprising 0.1 to 0.5 parts by weight of a wetting agent;

the wetting agent comprises at least one of polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether and polyoxyethylene-polyoxypropylene block copolymer.

9. The sound-absorbing paint according to claim 1, further comprising 0.1 to 0.5 parts by weight of an antifoaming agent;

the defoamer comprises polysiloxane and/or polyether modified polysiloxane.

10. The sound absorbing paint of claim 1, further comprising 0.05-2 parts by weight of a thickener.

11. The sound-absorbing paint according to claim 1, further comprising 5 to 20 parts by weight of a pigment filler;

the pigment and filler comprises titanium dioxide.

12. The sound-absorbing coating according to claim 1, wherein the solid content of the sound-absorbing coating is 65-95%.

13. A method for preparing the sound-absorbing paint according to any one of claims 1 to 12, comprising:

14. The method of claim 13, wherein the mixed material further comprises at least one of cellulose, a first filler, a dispersant, a wetting agent, an antifoaming agent, a thickener, or a pigment filler;

the mixing is performed in a solvent;

the solvent comprises water.

15. The method of manufacturing of claim 14, wherein the method of manufacturing the sound absorbing coating comprises:

(3) Mixing the stabilizing solution obtained in the step (2) with the hybrid emulsion, the polyurethane graphene-silicon dioxide aerogel and an optional defoaming agent to obtain a primary product solution;

(4) Mixing the primary product liquid obtained in the step (3) with an optional thickener and/or solvent to obtain the sound-absorbing coating;

and (3) mixing in the step (2) for 20-40 min.

16. Use of the sound absorbing coating according to any one of claims 1 to 12 for sound absorption and noise reduction.