CN114958114A - Environment-friendly efficient sound insulation coating - Google Patents
Environment-friendly efficient sound insulation coating Download PDFInfo
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- CN114958114A CN114958114A CN202210741466.1A CN202210741466A CN114958114A CN 114958114 A CN114958114 A CN 114958114A CN 202210741466 A CN202210741466 A CN 202210741466A CN 114958114 A CN114958114 A CN 114958114A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D101/00—Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
- C09D101/08—Cellulose derivatives
- C09D101/26—Cellulose ethers
- C09D101/28—Alkyl ethers
- C09D101/284—Alkyl ethers with hydroxylated hydrocarbon radicals
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to the technical field of sound insulation coatings, in particular to an environment-friendly water-based efficient sound insulation coating, which is characterized in that raw materials, fillers and auxiliary materials are fully mixed to fully crosslink various materials, the raw materials, the fillers and the auxiliary materials are fully mixed to fully crosslink various materials, and meanwhile, the raw materials are matched with each other for use, for example, the weather resistance, the chemical resistance and the adhesive force of the coating are enhanced by epoxy modified acrylic emulsion; the mineral fiber is added into a layer of the coating to enhance the sound insulation, shock absorption and tensile crack resistance of the coating; the hollow glass beads enhance the sound insulation effect of the coating; the redispersible rubber powder enhances the flexibility and the bonding strength of the coating; preservatives are used to prevent microbial infection and proliferation. The invention improves the comprehensive performance of the coating, ensures that the coating is not easy to bulge, crack and fall off after the construction is finished, is not easy to have dust pollution, enhances the sound insulation performance of the coating and reduces the subsequent maintenance cost.
Description
Technical Field
The invention relates to the technical field of sound insulation coatings, in particular to an environment-friendly water-based efficient sound insulation coating.
Background
The improvement of building technology and the improvement of the requirements of people on living quality lead the indoor sound environment quality of residential buildings to be more and more concerned by people, and except that the sound-insulating coating of the building layer meets the requirements of green and health, the requirements on the sound-insulating effect and the environmental protection are higher and higher. With the development of society and the increase of vehicles, entertainment places and industrial areas, the noise pollution of cities is more and more. A large amount of noise fills the lives of people, and causes a novel pollution, noise pollution. These noise pollutions cause serious troubles to people in normal learning, working and life.
The Chinese invention patent CN 111621204B discloses a sound insulation coating, which uses rubber powder, and when the rubber powder is polished, dust flies to cause air pollution, thus being economical but not environment-friendly; the Chinese invention patent CN 107778685A discloses a sound insulation material, and the sound insulation coating has the advantages of high strength, high tensile property, shock absorption and the like. However, the coating has poor sound insulation effect, causes serious pollution to the environment and is not environment-friendly.
The water-based sound insulation coating used in the market at present mainly has the following forms, firstly, the coating is energy-saving and economical, but a large amount of organic compounds exist or dust flies, so that environmental pollution is easily caused; and secondly, the used materials of the coating are environment-friendly, but the cost is high and the price is relatively expensive. And the coating has the defects of uneven dispersion, short service life and the like, the problems of deterioration, poor sound insulation effect and easy breakage of the coating easily occur, the cost is increased, and dust is easy to fly in subsequent maintenance to cause air pollution.
Disclosure of Invention
The invention aims to provide an environment-friendly water-based high-efficiency sound insulation coating, and solves the technical problems that the sound insulation effect is poor, the sound insulation effect is easy to break and the maintenance cost is too high after the existing water-based sound insulation coating is used for a long time.
In order to realize the purpose, the invention provides an environment-friendly water-based high-efficiency sound insulation coating, which comprises the following components: 5.5-14 parts of epoxy modified acrylic emulsion, 5.5-14 parts of acrylic elastic emulsion, 5.5-9 parts of hydroxypropyl methyl cellulose, 10.5-29 parts of mineral fiber, 20.5-39 parts of hollow glass microsphere, 5.5-9 parts of redispersible rubber powder, 5.5-9 parts of preservative and 30.5-49 parts of water.
The environment-friendly water-based high-efficiency sound insulation coating further comprises a filler, wherein the filler is at least one of heavy calcium powder and talcum powder.
5.5-19 parts of heavy calcium powder and 5.5-9 parts of talcum powder.
The environment-friendly water-based efficient sound insulation coating further comprises an auxiliary material, wherein the auxiliary material is at least one of mica powder, modified bentonite, an anti-settling agent, a film forming auxiliary agent, a wetting agent and a dispersing agent.
The mica powder is 5.5-9 parts, the modified bentonite is 5-9 parts, the anti-settling agent is 3.5-9 parts, the film forming additive is 5.5-9 parts, the wetting agent is 5.5-9 parts, and the dispersing agent is 5.5-9 parts.
Wherein the mineral fibres are fibres obtained from mineral rocks of a fibrous structure.
Wherein the hollow glass beads are fly ash hollow spheres capable of floating on the water surface, the walls are thin and hollow, the weight is light, and the volume weight is 418.8kg/m 3 ～720kg/m 3 The surface is closed and smooth.
The invention has the beneficial effects that: the raw materials, the filler and the auxiliary materials are fully mixed, so that various materials are fully crosslinked, and the raw material components are matched for use, so that the weather resistance, the chemical resistance and the adhesive force of the coating are enhanced by using the epoxy modified acrylic emulsion; the acrylic elastic emulsion enhances the elongation and elasticity of the coating; the hydroxypropyl methyl cellulose can avoid air pollution caused by dust flying, and the viscosity of the coating is increased; the mineral fiber is added into a layer of the coating to enhance the sound insulation, shock absorption and tensile crack resistance of the coating; the hollow glass beads enhance the sound insulation effect of the coating; the redispersible rubber powder enhances the flexibility and the bonding strength of the coating; preservatives are used to prevent microbial infection and proliferation. The invention improves the comprehensive performance of the coating, ensures that the coating is not easy to bulge, crack and fall off after the construction is finished, is not easy to have dust pollution, enhances the sound insulation performance of the coating and reduces the subsequent maintenance cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a graph of experimental data for an eco-friendly aqueous high-efficiency soundproof coating according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention provides an environment-friendly water-based high-efficiency sound insulation coating, which comprises the following components: 5.5-14 parts of epoxy modified acrylic emulsion, 5.5-14 parts of acrylic elastic emulsion, 5.5-9 parts of hydroxypropyl methyl cellulose, 10.5-29 parts of mineral fiber, 20.5-39 parts of hollow glass microsphere, 5.5-9 parts of redispersible rubber powder, 5.5-9 parts of preservative and 30.5-49 parts of water.
Among them, epoxy-modified acrylic emulsions are widely used in various paints because of their excellent weatherability, gloss and color retention, adhesion, film-forming properties, and the like. Preferably, the epoxy modified acrylic resin is modified by epoxy resin to obtain epoxy modified acrylic emulsion, which can further improve the weather resistance, light and color retention, adhesion, durability and the like of the coating.
The acrylic elastic emulsion has excellent comprehensive performance in the sound-proof coating, has the performances of water resistance, ultraviolet resistance, dust accumulation resistance, weather resistance and the like, has better rebound resilience, adhesion and flexibility, is particularly more prominent in extension performance and elasticity, can effectively prevent cracks, and simultaneously takes moisture as a solvent, is nontoxic and harmless, and improves the environmental protection performance of the sound-proof coating.
The hydroxypropyl methyl cellulose has emulsification effect, and is beneficial to improving viscosity and keeping uniform and stable suspension state, emulsion state or gel formation, thereby improving the viscosity degree of the coating. Avoiding the air pollution caused by the flying of dust. Convenient for practical use.
The mineral fiber plays the roles of sound insulation, shock absorption and tensile crack resistance in the sound insulation coating. And the mineral fibres are fibres obtained from mineral rocks of fibrous structure. The main substances of the composition are oxides such as magnesium oxide, aluminum oxide, silicon dioxide and the like, and the composition is environment-friendly and non-toxic.
The hollow glass microspheres play a main sound insulation effect in the sound insulation coating, and particularly are fly ash hollow spheres capable of floating on water surface, the hollow glass microspheres are grey white, thin-walled and hollow, the weight is light, and the volume weight is 720kg/m 3 (heavy), 418.8kg/m 3 (light weight), particle size about 0.1 mm, closed and smooth surface; meanwhile, the material has the advantages of small heat conductivity and 1610 ℃ of refractoriness, and can be used as a material with excellent sound insulation, heat preservation, shock absorption and fire resistance. The hollow glass bead components in the embodiment comprise aluminum oxide and silicon dioxide, and after the aluminum oxide and the silicon dioxide are mixed, the hollow glass bead has the characteristics of light weight, hollowness, fine particles, high strength, high temperature resistance, wear resistance, insulation, flame retardance, heat preservation, insulation, sound absorption and the like.
The redispersible rubber powder has outstanding flexibility and bonding strength in the sound insulation coating, and has longer open time by improving the flexibility among particles, so that the adhesiveness and the cohesiveness among different raw materials are improved, and the waterproofness, the breaking strength, the wear resistance and the plasticity of the sound insulation coating are better improved.
The preservative mainly inhibits the infection and propagation of microorganisms in the sound-proof coating, so that the coating has a certain preservation period, and the storage and service life of the coating are prolonged.
The environment-friendly water-based high-efficiency sound insulation coating also comprises a filler, wherein the filler is at least one of heavy calcium powder and talcum powder.
5.5-19 parts of heavy calcium powder and 5.5-9 parts of talcum powder.
The coarse whiting powder has the characteristics of good purity, soft hue, high whiteness and stable chemical components, so that the sound insulation coating is not easy to settle, easy to disperse and good in gloss, and in addition, the coarse whiting powder can also improve the hardness and the surface wear resistance of the coating. The component of talc is mainly hydrous magnesium silicate of talc, and because the crystalline structure of talc is layered, the talc has the tendency of splitting into scales and special lubricating property, and the performance of the coating is greatly improved.
The environment-friendly water-based high-efficiency sound insulation coating also comprises an auxiliary material, wherein the auxiliary material is at least one of mica powder, modified bentonite, an anti-settling agent, a film forming auxiliary agent, a wetting agent and a dispersing agent.
5.5-9 parts of mica powder, 5-9 parts of modified bentonite, 3.5-9 parts of an anti-settling agent, 5.5-9 parts of a film-forming assistant, 5.5-9 parts of a wetting agent and 5.5-9 parts of a dispersing agent.
The mica powder has stable chemical property, can effectively improve the elasticity, the bending property and the wear resistance of the coating, further prolongs the service life of the coating, and the mica powder filler is more economical than seed resin.
The modified bentonite has strong hygroscopicity and expansibility, has certain adsorption capacity on various gases, liquids and organic substances, and has plasticity and cohesiveness. The paint has low cost and obvious effect of removing environmental pollutants, and further improves the performances of stability, environmental protection, anti-settling property and the like of the paint.
The anti-settling agent is used as a rheological control agent, so that the sound insulation coating has thixotropy and greatly improved viscosity, and in addition, the production, storage, coating and film coating performances of the coating are improved.
The film forming assistant can promote the plastic flow and elastic deformation of the high molecular compound, further improve the coalescence performance and is beneficial to improving the sound insulation performance of the coating.
The wetting agent is used for improving the surface tension and permeability of the coating, so that water can be fully spread on the surface or permeate into the surface, the wetting effect can be achieved, and the adhesion of the coating is improved.
The dispersing agent utilizes the interface properties of lipophilicity and hydrophilicity which are opposite, can reduce the aggregation of solid or liquid particles in a dispersing system, and can uniformly disperse partial materials which are difficult to dissolve in liquid, thereby preventing the phenomena of sedimentation and agglomeration.
Further, the invention also provides 3 specific embodiments of the environment-friendly water-based high-efficiency sound insulation coating.
Specific example 1:
the environment-friendly water-based high-efficiency sound insulation coating comprises the following raw materials in parts by weight:
5.5 parts of epoxy modified acrylic emulsion;
5.5 parts of acrylic elastic emulsion;
5.5 parts of hydroxypropyl methyl cellulose;
10.5 parts of mineral fiber;
20.5 parts of hollow glass beads;
5.5 parts of redispersible rubber powder;
5.5 parts of a preservative;
water content: 30.5 parts.
The concrete process is that 30.5kg of water, 5.5kg of epoxy modified acrylic emulsion, 5.5kg of acrylic elastic emulsion, 5.5kg of hydroxypropyl methyl cellulose, 10.5kg of mineral fiber and 20.5kg of hollow glass microsphere are added into a production cylinder, 5.5kg of preservative is sequentially added into the production cylinder at the rotating speed of 400 revolutions per minute after 5.5kg of dispersed rubber powder is started to be stirred, and finally the mixture is stirred for 15min to be uniform at the rotating speed of 400 revolutions per minute to obtain the water-based sound insulation coating.
Specific example 2:
the environment-friendly water-based high-efficiency sound insulation coating comprises the following raw materials in parts by weight:
9.5 parts of epoxy modified acrylic emulsion;
9.5 parts of acrylic elastic emulsion;
4.5 parts of hydroxypropyl methyl cellulose;
19.5 parts of mineral fiber;
29.5 parts of hollow glass beads;
4.5 parts of redispersible rubber powder;
4.5 parts of preservative:
water content: 39.5 parts.
The concrete process is that 39.5kg of water, 9.5kg of epoxy modified acrylic emulsion, 9.5kg of acrylic elastic emulsion, 4.5kg of hydroxypropyl methyl cellulose, 19.5kg of mineral fiber and 29.5kg of hollow glass microsphere are added into a production cylinder, 4.5kg of preservative is sequentially added into the production cylinder at the rotating speed of 400 revolutions per minute after 4.5kg of dispersed rubber powder is started to be stirred, and finally the mixture is stirred for 15min to be uniform at the rotating speed of 400 revolutions per minute to obtain the water-based sound insulation coating.
Specific example 3:
the environment-friendly water-based high-efficiency sound insulation coating comprises the following raw materials in parts by weight:
14 parts of epoxy modified acrylic emulsion;
14 parts of acrylic elastic emulsion;
9 parts of hydroxypropyl methyl cellulose;
29 parts of mineral fiber;
39 parts of hollow glass beads;
9 parts of redispersible rubber powder;
9 parts of a preservative;
and 49 parts of water.
The concrete process is that 49kg of water, 14kg of epoxy modified acrylic emulsion, 14kg of acrylic elastic emulsion, 9kg of hydroxypropyl methyl cellulose, 29kg of mineral fiber and 39kg of hollow glass microsphere are added into a production cylinder, 9kg of preservative is sequentially added into the production cylinder at the rotation speed of 400 rpm after stirring is started in 9kg of dispersed rubber powder, and finally the production cylinder is stirred for 15min to be uniform at the rotation speed of 400 rpm to obtain the water-based sound insulation coating.
Further, in order to verify the sound insulation effect of the coating, the environment-friendly high-efficiency sound insulation coating is coated on a wall body, different vibrations and beating frequencies are adopted to generate sound, and sound collection, recording and analysis are carried out within a certain range. According to experimental data, with the continuous increase of the beating frequency, after the environment-friendly water-based high-efficiency sound insulation coating is coated, the received sound decibel is kept basically unchanged, the test data is calculated to be 67(-6) d B according to the evaluation index value of GB/T50121-2005 building sound insulation evaluation standard, the sound insulation effect is relatively good when the sound insulation data is not higher than the specified value.
Please refer to fig. 1 for the values.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. An environment-friendly water-based high-efficiency sound insulation coating is characterized in that,
comprises the following components: 5.5-14 parts of epoxy modified acrylic emulsion, 5.5-14 parts of acrylic elastic emulsion, 5.5-9 parts of hydroxypropyl methyl cellulose, 10.5-29 parts of mineral fiber, 20.5-39 parts of hollow glass microsphere, 5.5-9 parts of redispersible rubber powder, 5.5-9 parts of preservative and 30.5-49 parts of water.
2. The environmentally friendly aqueous high efficiency acoustical coating of claim 1,
the environment-friendly water-based high-efficiency sound insulation coating also comprises a filler, wherein the filler is at least one of heavy calcium powder and talcum powder.
3. The environmentally friendly aqueous high efficiency acoustical coating of claim 2,
5.5-19 parts of heavy calcium powder and 5.5-9 parts of talcum powder.
4. The environmentally friendly aqueous high efficiency acoustical coating of claim 1,
the environment-friendly water-based high-efficiency sound insulation coating also comprises an auxiliary material, wherein the auxiliary material is at least one of mica powder, modified bentonite, an anti-settling agent, a film forming auxiliary agent, a wetting agent and a dispersing agent.
5. The environment-friendly aqueous high-efficiency soundproof coating composition according to claim 4,
5.5-9 parts of mica powder, 5-9 parts of modified bentonite, 3.5-9 parts of an anti-settling agent, 5.5-9 parts of a film-forming assistant, 5.5-9 parts of a wetting agent and 5.5-9 parts of a dispersing agent.
6. The environmentally friendly aqueous high efficiency acoustical coating of claim 1,
the mineral fibres are fibres obtained from mineral rocks of fibrous structure.
7. The environmentally friendly aqueous high efficiency acoustical coating of claim 1,
the hollow glass beads are fly ash hollow spheres capable of floating on water surface, are thin and hollow in wall, light in weight and 418.8kg/m in volume weight 3 ～720kg/m 3 The surface is closed and smooth.
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2022
- 2022-06-27 CN CN202210741466.1A patent/CN114958114A/en active Pending
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| RU2310670C1 (en) * | 2006-07-31 | 2007-11-20 | Богдан Васильевич Бондарчук | Heat-moisture-protecting dye-cover |
| CN106221458A (en) * | 2016-08-30 | 2016-12-14 | 河北晨阳工贸集团有限公司 | A kind of steel construction special anti-corrosion sealing wax and preparation method thereof |
| CN110951347A (en) * | 2019-12-12 | 2020-04-03 | 广州协堡建材有限公司 | Water-based sound insulation coating for ground sound insulation and shock absorption and preparation method thereof |
| CN111764697A (en) * | 2020-06-29 | 2020-10-13 | 苏州东方空间技术工程有限公司 | Indoor sound insulation structure |
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