CN107399991B - Inorganic composite foam sound absorption material based on Helmholtz resonance sound absorption principle and preparation method thereof - Google Patents
Inorganic composite foam sound absorption material based on Helmholtz resonance sound absorption principle and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
- C04B38/106—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam by adding preformed foams
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
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Abstract
The invention belongs to the technical field of sound absorption materials. In order to solve the technical problems of poor sound absorption effect, unstable performance and easy aging existing in the prior art, the invention provides an inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle and a preparation method thereof. The material comprises the following components in parts by weight: 100 parts of ceramic powder, 0.2-2.0 parts of aluminum powder, 30-60 parts of water and 15-30 parts of air entraining agent foam liquid; the method comprises the following steps: A. preparing wet slurry: mixing and stirring ceramic powder, aluminum powder and water uniformly according to a proportion to obtain wet slurry; B. pouring: mixing and stirring the air entraining agent foam liquid and the ceramic wet slurry uniformly, and pouring in a specified mould; C. molding: naturally curing and forming at normal temperature and normal pressure. The invention has the characteristics of good sound absorption effect and stable performance.
Description
Technical Field
The invention belongs to the technical field of chemical materials, and particularly relates to an inorganic composite foam sound absorption material based on a Helmholtz resonance sound absorption principle and a preparation method thereof.
Background
Noise is a large environmental nuisance that interferes with the lives of people, particularly urban residents. With the improvement of living standard, the requirements of people on the quality of acoustic environments of working and living places are higher and higher, and the control and noise elimination are the focus of wide attention at home and abroad. The sound absorption materials currently used in production mainly include the following: 1. organic foamed plastics such as polyurethane foam, urea-formaldehyde foamed plastics, etc., have the advantages of low density, moisture resistance, easy cutting and forming, convenient installation, and the disadvantages of unstable sound absorption performance, easy aging and incapability of being used in outdoor environment; 2. organic fibers such as cotton, hemp, palm fiber and other plant fibers have the advantages of small density, high sound absorption coefficient, low price and the defects of flammability, easy mildew and moth damage and incapability of being used in outdoor environment; 3. inorganic fibers such as centrifugal glass wool, rock wool and the like have the advantages of small density, high sound absorption coefficient, non-combustibility, high chemical stability and heat preservation, and have the defects of small strength, easy breakage and dissipation, high moisture absorption and water absorption and obviously reduced sound absorption performance after being wetted; 4. inorganic foam materials, such as aerated concrete, foamed ceramic, expanded perlite products and the like, have the advantages of high strength, water resistance, non-combustibility, corrosion resistance, no aging, good processability, capability of being used in outdoor environment, common sound absorption effect and low micropore penetration rate.
Although various sound-absorbing materials are available in the market at present, a sound-absorbing material which can be really used in indoor and outdoor environments and has stable and excellent sound-absorbing effects is not available, and the development and application of novel sound-absorbing materials are still needed for realizing pollution control of indoor and outdoor sound environments.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art and provides an inorganic composite foam sound absorption material which has a good sound absorption effect and stable performance and is based on the Helmholtz resonance sound absorption principle and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
an inorganic composite foam sound absorption material based on a Helmholtz resonance sound absorption principle comprises the following components in parts by weight: 100 parts of ceramic powder, 0.2-2.0 parts of aluminum powder, 30-60 parts of water and 15-30 parts of air entraining agent foam liquid.
Further, the sound absorption material comprises the following components in parts by weight: 100 parts of ceramic powder, 0.2-1.0 part of aluminum powder, 35-45 parts of water and 15-30 parts of air entraining agent foam liquid.
Further, the ceramic powder comprises the following components in percentage by weight: CaO 52-67%, SiO214-28％、Al2O35-16％、Fe2O33-8％、MgO 1-5％、CaCl21-3％、Na2O1-3%, wherein the sum of the weight percentages of all the components of the ceramic powder is 100%.
Further, the sound absorption material comprises the following components in parts by weight: 100 parts of ceramic powder, 0.6 part of aluminum powder, 40 parts of water and 20 parts of air entraining agent foam liquid; the ceramic powder comprises the following components in percentage by weight: 61.5% of CaO and SiO225％、Al2O35％、Fe2O35％、MgO 1.5％、CaCl21.5％、Na2O 0.5％。
Further, the air entraining agent foam liquid comprises the following components in parts by weight: 1000 parts of water, 0.8 part of sodium hydroxide, 4.0 parts of rosin, 3.0 parts of bone glue and 3.0 parts of polyvinyl alcohol.
Further, it is characterized byThe sound absorption material comprises the following components in parts by weight: 100 parts of ceramic powder, 0.8 part of aluminum powder, 45 parts of water and 15 parts of air-entraining foam liquid; the ceramic powder comprises the following components in percentage by weight: CaO 64%, SiO218％、Al2O311％、Fe2O33％、MgO 1.5％、CaCl22％、Na2O 0.5％。
Further, the air entraining agent foam liquid comprises the following components in parts by weight: 1000 parts of water, 5 parts of sodium hydroxide, 14 parts of rosin, 15 parts of bone glue and 3 parts of triethylamine.
A preparation method of an inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle comprises the following steps:
A. preparing wet slurry: mixing and stirring ceramic powder, aluminum powder and water uniformly according to a proportion to obtain wet slurry;
B. pouring: mixing and stirring the air entraining agent foam liquid and the ceramic wet slurry uniformly, and pouring in a specified mould;
C. molding: naturally curing and forming at normal temperature and normal pressure.
The method also comprises the following steps of preparing an air entraining agent foam concentrate before the step A or the step B: mixing water, sodium hydroxide, rosin, bone glue and polyvinyl alcohol in proportion, and beating the mixture into air entraining agent foam liquid with uniform foam through a foaming machine.
A preparation method of an inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle comprises the following steps:
A. preparing wet slurry: mixing and stirring ceramic powder, aluminum powder and water uniformly according to a proportion to obtain wet slurry;
B. pouring: mixing and stirring the air entraining agent foam liquid and the ceramic wet slurry uniformly, and pouring in a specified mould;
C. molding: naturally curing and forming at normal temperature and normal pressure.
The method also comprises the following steps of preparing an air entraining agent foam concentrate before the step A or the step B: mixing water, sodium hydroxide, rosin, bone glue and triethylamine according to a proportion, and beating the mixture into air entraining agent foam liquid with uniform foam through a foaming machine.
The invention is relative toThe beneficial effects in the prior art are as follows: the sound absorption mechanism of the helmholtz resonant structure is that near the resonant frequency, the particle velocity (or vibration velocity) somewhere in the structure reaches a very large value, and the acoustic energy is consumed in large quantities due to viscous losses, which applies if the wavelength of the extraneous acoustic wave must be larger than the size of the cavity (i.e., the "resonance cavity"), and the size of the small hole (i.e., the "diameter") in the cavity wall must be much smaller than the size of the cavity. The current practical production designs of the perforation and the micro-perforation are all in millimeter or sub-millimeter level (10)-1mm) followed by a cavity in more than centimeters (typically more than 5 cm), the designed sound absorbing structure is generally effective for incident sound waves at wavelengths greater than 2 x 102mm low frequency sound waves (frequencies below 1700Hz), so for a long time the helmholtz resonance sound absorption principle has been considered only suitable for low frequency sound. Theoretically, if the micro-pores on the "resonant cavity" are adjusted to 10-2mm grade, "cavity" diameter of 100mm or even 10mm-1mm level, the wavelength of the resonance sound wave can be expected to be expanded to 10mm level, and the highest characteristic absorption frequency can be improved to 104Hz level and enters the ultra-high frequency region.
The sound absorption material is based on a sound absorption mechanism of a Helmholtz resonance structure, and a resonant cavity of a corresponding grade is manufactured in an inorganic material by adopting a composite foaming process, so that full-frequency (broadband) absorption in an audible frequency range is realized. The material provided by the invention can be widely used in places needing sound elimination and insulation measures such as urban elevated roads, railways, subways, construction sites, heavy machinery plants, central air conditioner rooms, air compressor rooms, blower rooms and the like, and can also be used in places with acoustic requirements such as music halls, studios, conference centers, stadiums and the like.
Detailed Description
The technical solutions of the present invention are described in detail below with reference to examples, and it should be noted that the following are only preferred embodiments of the present invention, and it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept of the present invention, and these should all fall into the protective scope of the present invention.
An inorganic composite foam sound absorption material based on a Helmholtz resonance sound absorption principle comprises the following components in parts by weight: 100 parts of ceramic powder, 0.2-2.0 parts of aluminum powder, 30-60 parts of water and 15-30 parts of air entraining agent foam liquid. Further, the sound absorption material comprises the following components in parts by weight: 100 parts of ceramic powder, 0.2-1.0 part of aluminum powder, 35-45 parts of water and 15-30 parts of air entraining agent foam liquid.
The inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle is prepared by adopting ceramic powder, aluminum powder, water and air entraining agent foam concentrate, and the material contains a large amount of foam liquid with the aperture of 10-110mm bubbles (i.e., "resonant cavities"), with each "resonant cavity" passing through at least one elongated (about 10mm in length)-2100mm) of "neck" (diameter of about 10)-3～10-1mm) to communicate with other "resonant cavities" or material surfaces; the size of the resonant cavity and neck is 10-110mm and 10-3～10-1The sound absorption requirements of sound waves in different frequency bands can be met according to requirements. The density of the ceramic material and the size of the vacuole (the resonant cavity) in the material can be adjusted, and the length and thickness of the neck in the material can be adjusted.
Further, the ceramic powder comprises the following components in percentage by weight: CaO 52-67%, SiO214-28％、Al2O35-16％、Fe2O33-8％、MgO 1-5％、CaCl21-3％、Na2O1-3%, wherein the sum of the weight percentages of all the components of the ceramic powder is 100%.
Further, the sound absorption material comprises the following components in parts by weight: 100 parts of ceramic powder, 0.6 part of aluminum powder, 40 parts of water and 20 parts of air entraining agent foam liquid; the ceramic powder comprises the following components in percentage by weight: 61.5% of CaO and SiO225％、Al2O35％、Fe2O35％、MgO 1.5％、CaCl21.5％、Na2O 0.5％。
Further, the air entraining agent foam liquid comprises the following components in parts by weight: 1000 parts of water, 0.8 part of sodium hydroxide, 4.0 parts of rosin, 3.0 parts of bone glue and 3.0 parts of polyvinyl alcohol.
Further, the sound absorption material comprises the following components in parts by weight: 100 parts of ceramic powder, 0.8 part of aluminum powder, 45 parts of water and 15 parts of air-entraining foam liquid; the ceramic powder comprises the following components in percentage by weight: CaO 64%, SiO218％、Al2O311％、Fe2O33％、MgO 1.5％、CaCl22％、Na2O 0.5％。
Further, the air entraining agent foam liquid comprises the following components in parts by weight: 1000 parts of water, 5 parts of sodium hydroxide, 14 parts of rosin, 15 parts of bone glue and 3 parts of triethylamine.
A preparation method of an inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle comprises the following steps:
A. preparing wet slurry: mixing and stirring ceramic powder, aluminum powder and water uniformly according to a proportion to obtain wet slurry;
B. pouring: mixing and stirring the air entraining agent foam liquid and the ceramic wet slurry uniformly, and pouring in a specified mould;
C. molding: naturally curing and forming at normal temperature and normal pressure.
The method also comprises the following steps of preparing an air entraining agent foam concentrate before the step A or the step B: mixing water, sodium hydroxide, rosin, bone glue and polyvinyl alcohol in proportion, and beating the mixture into air entraining agent foam liquid with uniform foam through a foaming machine.
A preparation method of an inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle comprises the following steps:
A. preparing wet slurry: mixing and stirring ceramic powder, aluminum powder and water uniformly according to a proportion to obtain wet slurry;
B. pouring: mixing and stirring the air entraining agent foam liquid and the ceramic wet slurry uniformly, and pouring in a specified mould;
C. molding: naturally curing and forming at normal temperature and normal pressure.
The method also comprises the following steps of preparing an air entraining agent foam concentrate before the step A or the step B: mixing water, sodium hydroxide, rosin, bone glue and triethylamine according to a proportion, and beating the mixture into air entraining agent foam liquid with uniform foam through a foaming machine.
Example 1
An inorganic composite foam sound absorption material based on a Helmholtz resonance sound absorption principle comprises the following components in parts by weight: 100 parts of ceramic powder, 0.2 part of aluminum powder, 35 parts of water and 25 parts of air entraining agent foam liquid; the ceramic powder comprises the following components in percentage by weight: CaO 52%, SiO228％、Al2O35％、Fe2O35％、MgO 5％、CaCl22％、Na2O 3％。
Example 2
An inorganic composite foam sound absorption material based on a Helmholtz resonance sound absorption principle comprises the following components in parts by weight: 100 parts of ceramic powder, 2.0 parts of aluminum powder, 60 parts of water and 30 parts of air entraining agent foam liquid; the ceramic powder comprises the following components in percentage by weight: 67% of CaO and SiO214％、Al2O38％、Fe2O33％、MgO 4％、CaCl23％、Na2O 1％。
Example 3
An inorganic composite foam sound absorption material based on a Helmholtz resonance sound absorption principle comprises the following components in parts by weight: 100 parts of ceramic powder, 1.0 part of aluminum powder, 30 parts of water and 30 parts of air entraining agent foam liquid; the ceramic powder comprises the following components in percentage by weight: 67% of CaO and SiO214％、Al2O38％、Fe2O33％、MgO 4％、CaCl23％、Na2O 1％。
Example 4
An inorganic composite foam sound absorption material based on a Helmholtz resonance sound absorption principle comprises the following components in parts by weight: 100 parts of ceramic powder, 0.8 part of aluminum powder, 35 parts of water and 25 parts of air entraining agent foam liquid; the ceramic powder comprises the following components in percentage by weight: CaO 55%, SiO220％、Al2O312％、Fe2O36％、MgO 3％、CaCl22％、Na2O 2％。
Example 5
An inorganic composite foam sound absorption material based on a Helmholtz resonance sound absorption principle comprises the following components in parts by weight: 100 parts of ceramic powder, 0.4 part of aluminum powder, 40 parts of water and 20 parts of air entraining agent foam liquid.
The ceramic powder comprises the following components in percentage by weight: 65% of CaO and SiO216％、Al2O38％、Fe2O36％、MgO 3％、CaCl21％、Na2O 1％。
Example 6
An inorganic composite foam sound absorption material based on a Helmholtz resonance sound absorption principle comprises the following components in parts by weight: 100 parts of ceramic powder, 1.0 part of aluminum powder, 30 parts of water and 30 parts of air entraining agent foam liquid.
The ceramic powder comprises the following components in percentage by weight: 54% of CaO and SiO222％、Al2O314％、Fe2O35％、MgO 2％、CaCl22％、Na2O 1％。
Example 7
An inorganic composite foam sound absorption material based on a Helmholtz resonance sound absorption principle comprises the following components in parts by weight: 100 parts of ceramic powder, 0.7 part of aluminum powder, 36 parts of water and 24 parts of air entraining agent foam liquid.
The ceramic powder comprises the following components in percentage by weight: CaO 58% and SiO218％、Al2O312％、Fe2O36％、MgO 2％、CaCl23％、Na2O 1％。
Example 8
An inorganic composite foam sound absorption material based on a Helmholtz resonance sound absorption principle comprises the following components in parts by weight: 100 parts of ceramic powder, 0.6 part of aluminum powder, 40 parts of water and 20 parts of air entraining agent foam liquid; the ceramic powder comprises the following components in percentage by weight: 61.5% of CaO and SiO225％、Al2O35％、Fe2O35％、MgO 1.5％、CaCl21.5％、Na2O 0.5％。
Further, the air entraining agent foam liquid comprises the following components in parts by weight: 1000 parts of water, 0.8 part of sodium hydroxide, 4.0 parts of rosin, 3.0 parts of bone glue and 3.0 parts of polyvinyl alcohol.
A preparation method of an inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle comprises the following steps:
A. preparing wet slurry: mixing and stirring ceramic powder, aluminum powder and water uniformly according to a proportion to obtain wet slurry;
B. pouring: mixing and stirring the air entraining agent foam liquid and the ceramic wet slurry uniformly, and pouring in a specified mould;
C. molding: naturally curing and forming at normal temperature and normal pressure.
The method also comprises the following steps of preparing an air entraining agent foam concentrate before the step A or the step B: mixing water, sodium hydroxide, rosin, bone glue and polyvinyl alcohol in proportion, and beating the mixture into air entraining agent foam liquid with uniform foam through a foaming machine.
Example 9
An inorganic composite foam sound absorption material based on a Helmholtz resonance sound absorption principle comprises the following components in parts by weight: 100 parts of ceramic powder, 0.8 part of aluminum powder, 45 parts of water and 15 parts of air-entraining foam liquid; the ceramic powder comprises the following components in percentage by weight: CaO 64%, SiO218％、Al2O311％、Fe2O33％、MgO 1.5％、CaCl22％、Na20.5 percent of O. Further, the air entraining agent foam liquid comprises the following components in parts by weight: 1000 parts of water, 5 parts of sodium hydroxide, 14 parts of rosin, 15 parts of bone glue and 3 parts of triethylamine.
A preparation method of an inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle comprises the following steps:
A. preparing wet slurry: mixing and stirring ceramic powder, aluminum powder and water uniformly according to a proportion to obtain wet slurry;
B. pouring: mixing and stirring the air entraining agent foam liquid and the ceramic wet slurry uniformly, and pouring in a specified mould;
C. molding: naturally curing and forming at normal temperature and normal pressure.
The method also comprises the following steps of preparing an air entraining agent foam concentrate before the step A or the step B: mixing water, sodium hydroxide, rosin, bone glue and triethylamine according to a proportion, and beating the mixture into air entraining agent foam liquid with uniform foam through a foaming machine.
Example 10
A preparation method of an inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle comprises the following steps:
A. 100 parts of CaO 61.5 percent and SiO225％、Al2O35％、Fe2O35％、MgO1.5％、CaCl21.5％、Na20.5 percent of ceramic material, 0.6 part of metal aluminum powder and 40 parts of water are mixed and stirred into wet slurry;
B. preparing air entraining foam liquid: according to the weight percentage of water: sodium hydroxide: rosin: bone glue: polyvinyl alcohol 1000: 0.8: 4.0: 3.0: 3.0 to prepare foam liquid;
C. mixing 20 parts of foam liquid which is beaten into uniform foam by a beater with the ceramic wet slurry, uniformly stirring, and pouring into a specific mould;
D. naturally curing and forming at normal temperature and normal pressure.
The sound absorption coefficient of the 40mm material produced from the formulation, measured by standing wave tube method, is given in the following table (no cavity).
Example 11
A preparation method of an inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle comprises the following steps:
A. 100 parts of CaO 64 percent and SiO218％、Al2O311％、Fe2O33％、MgO1.5％、CaCl22％、Na20.5 percent of ceramic material, 0.8 part of metal aluminum powder and 45 parts of water are mixed and stirred into wet slurry;
B. preparing air entraining foam liquid: according to the weight percentage of water: sodium hydroxide: rosin: bone glue: triethylamine 1000: 5: 14: 15: 3, preparing a foam liquid;
C. mixing and stirring uniformly 15 parts of foam liquid which is beaten into uniform foam by a beater and the ceramic wet slurry, and pouring the mixture into a specific mould;
D. and naturally curing and forming at normal temperature and normal pressure.
The sound absorption coefficient of the 40mm material produced from the formulation, measured by standing wave tube method, is given in the following table (no cavity).
The technical means of the present invention can be preferably realized according to the description of the present specification.
Claims (9)
1. An inorganic composite foam sound absorption material based on a Helmholtz resonance sound absorption principle is characterized in that the sound absorption material comprises the following components in parts by weight: 100 parts of ceramic powder, 0.2-2.0 parts of aluminum powder, 30-60 parts of water and 15-30 parts of air entraining agent foam liquid;
the preparation method of the sound absorption material comprises the following steps:
A. preparing wet slurry: mixing and stirring ceramic powder, aluminum powder and water uniformly according to a proportion to obtain wet slurry;
B. pouring: mixing and stirring the air entraining agent foam liquid and the ceramic wet slurry uniformly, and pouring in a specified mould;
C. molding: naturally curing and forming at normal temperature and normal pressure;
the air entraining agent foam liquid comprises the following components in parts by weight: 1000 parts of water, 0.8 part of sodium hydroxide, 4.0 parts of rosin, 3.0 parts of bone glue and 3.0 parts of polyvinyl alcohol;
or the air entraining agent foam liquid comprises the following components in parts by weight: 1000 parts of water, 5 parts of sodium hydroxide, 14 parts of rosin, 15 parts of bone glue and 3 parts of triethylamine.
2. The inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle according to claim 1, wherein the raw materials of the sound absorption material comprise the following components in parts by weight: 100 parts of ceramic powder, 0.2-1.0 part of aluminum powder, 35-45 parts of water and 15-30 parts of air entraining agent foam liquid.
3. The inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle according to claim 1 or 2, wherein the ceramic powder comprises the following components in percentage by weight: CaO 52-67%, SiO214-28％、Al2O35-16％、Fe2O33-8％、MgO 1-5％、CaCl21-3％、Na2O1-3%, wherein the sum of the weight percentages of all the components of the ceramic powder is 100%.
4. The inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle according to claim 3, wherein the raw materials of the sound absorption material comprise the following components in parts by weight: 100 parts of ceramic powder, 0.6 part of aluminum powder, 40 parts of water and 20 parts of air entraining agent foam liquid; the ceramic powder comprises the following components in percentage by weight: 61.5% of CaO and SiO225％、Al2O35％、Fe2O35％、MgO 1.5％、CaCl21.5％、Na2O 0.5％。
5. The inorganic composite foam sound absorbing material based on the Helmholtz resonance sound absorption principle according to claim 4, wherein the air entraining agent foam concentrate comprises the following components in parts by weight: 1000 parts of water, 0.8 part of sodium hydroxide, 4.0 parts of rosin, 3.0 parts of bone glue and 3.0 parts of polyvinyl alcohol.
6. The inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle according to claim 3, wherein the raw materials of the sound absorption material comprise the following components in parts by weight: 100 parts of ceramic powder, 0.8 part of aluminum powder, 45 parts of water and 15 parts of air-entraining foam liquid; the ceramic powder comprises the following components in percentage by weight: CaO 64%, SiO218％、Al2O311％、Fe2O33％、MgO 1.5％、CaCl22％、Na2O 0.5％。
7. The inorganic composite foam sound absorbing material based on the Helmholtz resonance sound absorption principle according to claim 6, wherein the air entraining agent foam concentrate comprises the following components in parts by weight: 1000 parts of water, 5 parts of sodium hydroxide, 14 parts of rosin, 15 parts of bone glue and 3 parts of triethylamine.
8. A method for preparing the inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle in claim 4 or 5, which comprises the following steps:
A. preparing wet slurry: mixing and stirring ceramic powder, aluminum powder and water uniformly according to a proportion to obtain wet slurry;
B. pouring: mixing and stirring the air entraining agent foam liquid and the ceramic wet slurry uniformly, and pouring in a specified mould;
C. molding: naturally curing and forming at normal temperature and normal pressure;
the method also comprises the following steps of preparing an air entraining agent foam concentrate before the step A or the step B: mixing water, sodium hydroxide, rosin, bone glue and polyvinyl alcohol in proportion, and beating the mixture into air entraining agent foam liquid with uniform foam through a foaming machine.
9. A method for preparing the inorganic composite foam sound absorption material based on the Helmholtz resonance sound absorption principle in claim 6 or 7, which comprises the following steps:
the method also comprises the following steps of preparing an air entraining agent foam concentrate before the step A or the step B: mixing water, sodium hydroxide, rosin, bone glue and triethylamine according to a proportion, and beating the mixture into air entraining agent foam liquid with uniform foam through a foaming machine.
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