CN117567840A

CN117567840A - Sound insulation composite material and preparation method and application thereof

Info

Publication number: CN117567840A
Application number: CN202311634268.6A
Authority: CN
Inventors: 王晓旭; 张心悦; 罗莹莹; 井涵
Original assignee: Beijing University of Chemical Technology
Current assignee: Beijing University of Chemical Technology
Priority date: 2023-12-01
Filing date: 2023-12-01
Publication date: 2024-02-20

Abstract

The application relates to a sound insulation composite material, a preparation method and application thereof, and belongs to the technical field of noise reduction materials. The composite material comprises epoxy resin, hollow glass beads, a curing agent, an accelerator, a coupling agent and chopped carbon fibers. In the application, hollow glass beads are added into the epoxy resin, and the sound insulation effect of the epoxy resin can be further improved by adjusting the content of the hollow glass beads in the composite material; meanwhile, due to the synergistic effect of the chopped carbon fibers and the epoxy resin, the mechanical property of the composite material can be improved while the dispersibility and the sound insulation effect of the composite material are not affected, so that the composite material has higher practicability. The product is a high-performance acoustic material with low cost, light weight and excellent barrier effect, can be used for low-frequency noise isolation in living environment, such as a sound insulation and noise reduction plate on a room wall surface, and has wide practical application potential.

Description

Sound insulation composite material and preparation method and application thereof

Technical Field

The application relates to the technical field of noise reduction materials, and in particular relates to a sound insulation composite material, a preparation method and application thereof.

Background

Along with the rapid development of Chinese economy, the living standard of people is continuously improved, and more scientific products are applied to production and living. And noise pollution is inevitably brought to modern technology, and the quality of life of people is seriously influenced by the noise pollution, so that the physical and mental health of people is greatly endangered. Thus, noise control and isolation is a highly desirable problem, particularly for low frequency noise in dense residential area environments.

The traditional sound insulation engineering materials on the market at present are usually realized by materials with high density and large thickness, and the materials have high manufacturing cost and large occupied space, so that a plurality of inconveniences are brought to actual production and application; but also there is little research into dense residential building materials. Therefore, there is an urgent need to develop a high-performance acoustic material that is inexpensive, lightweight, excellent in barrier effect, and applicable to houses.

Disclosure of Invention

In view of the deficiencies of the prior art, it is an object of embodiments of the present application to provide a sound insulation composite material that is lightweight while also improving the low frequency noise of residential areas.

In a first aspect, embodiments of the present application provide a sound-insulating composite material comprising an epoxy resin, hollow glass microspheres, a curing agent, an accelerator, a coupling agent, and chopped carbon fibers; the mass ratio of the hollow glass beads to the epoxy resin is (0.01-0.4): 1; the mass ratio of the curing agent to the epoxy resin is (0.2-0.5): 1; the mass ratio of the accelerator to the epoxy resin is (0.01-0.2): 1; the mass ratio of the coupling agent to the epoxy resin is (0.001-0.03) 1; the addition amount of the chopped carbon fiber is 0.1-3% of the total mass of all raw materials; the diameter of the chopped carbon fiber is 6-8 mu m, and the length is 0.5-1.0mm; the particle size of the hollow glass beads is 1-300 mu m.

The hollow glass beads have a potentially good acoustic sound insulation structure: the shell is made of compact ceramic material, and the middle is filled with an air layer, so that a double-layer wall-like sound insulation structure can be formed. In addition, because the hollow glass beads are small in volume and large in quantity, the shell configuration combined with the radian of the hollow glass beads can enable sound waves to be reflected in multiple angles and multiple layers in a larger range, so that the sound wave energy is consumed, and the sound insulation effect is improved. The hollow glass beads are added into the epoxy resin, and the sound insulation effect of the epoxy resin can be further improved by adjusting the content of the hollow glass beads in the composite material; meanwhile, due to the synergistic effect of the chopped carbon fibers and the epoxy resin, the mechanical property of the composite material can be improved while the dispersibility and the sound insulation effect of the composite material are not affected, so that the composite material has higher practicability.

In some examples of the present application, the mass ratio of hollow glass beads to epoxy resin is (0.09-0.41): 1; the mass ratio of the curing agent to the epoxy resin is (0.35-0.45): 1; the mass ratio of the accelerator to the epoxy resin is (0.05-0.15): 1; the mass ratio of the coupling agent to the epoxy resin is (0.015-0.025): 1; the addition amount of the chopped carbon fiber is 0.9-1.5% of the total mass of all raw materials.

In some embodiments of the present application, the epoxy resin includes at least one of E44, E51, and TDE 85.

In some embodiments of the present application, the coupling agent includes KH-560 and/or KH570.

In some embodiments of the present application, the curing agent includes at least one of polyetheramine, triethylenetetramine, and p-toluenesulfonic acid.

In some embodiments of the present application, the accelerator comprises at least one of N, N-dimethylbenzylamine, maleic anhydride, and triethanolamine.

In a second aspect, an embodiment of the present application provides a method for preparing the composite material, including: mixing the raw materials to obtain a mixed material; and sequentially carrying out vacuum defoamation, vibration and solidification treatment on the mixed material to obtain the composite material.

In some embodiments of the present application, the mixing includes: and mixing other raw materials except for the hollow glass beads, then adding the hollow glass beads, stirring, and carrying out stirring under ultrasonic conditions to obtain a mixed material.

In some embodiments of the present application, the rotational speed of the agitation is 100-250r/min and the agitation time is 10-60min.

In some embodiments of the present application, the vacuum degassing process includes: pouring the mixed material into a mould, and carrying out vacuum defoaming treatment. Vacuum debubbling is used to remove bubbles, gases, and other unwanted gas voids from the composite; the performance, uniformity and quality of the material are improved.

In some embodiments of the present application, the vacuum degree of the vacuum degassing treatment is-0.05 to 0.1MPa.

In some embodiments of the present application, the time for the vacuum debubbling treatment is 0.5 to 24 hours.

In some embodiments of the present application, the time of the vibration treatment is 30-120 minutes. The purpose of the vibration treatment is mainly to further improve the uniformity and compactness of the composite material, and the microspheres in the die can be closely packed within the time range of the vibration treatment.

In some embodiments of the present application, the curing conditions include: the curing temperature is 50-65 deg.c and the curing time is 24-48 hr. By the curing process, the epoxy resin matrix in the mixed system will become firm while maintaining a uniform distribution of other additives, resulting in a sound insulating material with good sound insulating properties.

In a third aspect, embodiments of the present application provide an application of the composite material described above in the field of residential building materials. The composite material is suitable for low-frequency noise isolation in living environment, such as a sound insulation and noise reduction plate on a room wall surface, and has wide practical application potential.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.

The sound-insulating and noise-reducing board for wall surface of room is an important sound-insulating and noise-reducing product, and is a composite material prepared by filling hollow glass microsphere into polymer matrix. Compared with the traditional foam material, the hollow glass microsphere has low density, high specific strength and rigidity, low hygroscopicity and quite high thermal stability due to the unique closed-cell structure, and is widely applied to light high-strength sandwich materials, structural members in the field of aerospace industry, damping plates, buoyancy materials and sound and heat insulation materials.

Epoxy resins (EP) have very many excellent properties such as stable processing dimensions, easy processing and molding, low volume shrinkage during curing, excellent chemical stability, and can be used as a lightweight soundproof material, but have poor toughness, and the soundproof effect is to be improved. Therefore, the addition of hollow functional filler hollow glass beads (HGM) is considered to improve the sound insulation performance of the epoxy resin. The hollow glass beads have a potentially good acoustic sound insulation structure: the shell is made of compact ceramic material, and the middle is filled with an air layer, so that a double-layer wall-like sound insulation structure can be formed. In addition, due to the small size and the large number of the microbeads, the shell configuration combined with the radian of the microbeads can enable sound waves to be reflected in multiple angles and multiple layers in a larger range, so that the sound wave energy is consumed, and the sound insulation effect is improved.

In consideration of the problem that the hollow glass microsphere composite material is weak in mechanical property, the product is purposefully introduced with chopped carbon fibers so as to strengthen the mechanical property of the composite material and explore the isolation effect on low-frequency noise common to living environment. Carbon fiber is a novel reinforcing material and can be used as an ideal reinforcing body of functional materials and structural materials. The carbon fiber reinforced composite sound insulation material has the advantages of low density, high strength, high modulus, low expansion coefficient, high temperature resistance, corrosion resistance, electric conduction, heat conduction, shock absorption and the like, so that the carbon fiber reinforced composite sound insulation material has the excellent performance which cannot be replaced by other sound insulation materials. However, the research on the application of the material in sound insulation scenes is very few at present, particularly the research on the noise characteristics of living environment is very deficient, the theoretical basis of the system is not available, and the related material system research is also lacking. Therefore, a new sound insulation material is urgently needed at present, which can be used for the purposes of sound insulation and noise reduction in dormitory dense houses and other fields.

The embodiment of the application provides a sound insulation composite material, which is prepared by the following steps:

(1) And stirring and mixing the epoxy resin, the curing agent, the accelerator, the coupling agent and the chopped carbon fiber in a stirring reactor, and stirring under ultrasonic conditions to obtain a mixed material. The mass ratio of the hollow glass beads to the epoxy resin is (0.01-0.4): 1; the mass ratio of the curing agent to the epoxy resin is (0.2-0.5): 1; the mass ratio of the accelerator to the epoxy resin is (0.01-0.2): 1; the mass ratio of the coupling agent to the epoxy resin is (0.001-0.03) 1; the addition amount of the chopped carbon fiber is 0.1-3% of the total mass of all raw materials.

In the application, the diameter of the chopped carbon fiber is 6-8 mu m, and the length is 0.5-1.0mm; the particle size of the hollow glass beads is 1-300 mu m. By controlling the diameter and length of the carbon fibers within the above ranges, a more uniform dispersion can be achieved, the carbon fibers can be uniformly distributed in the composite material and can better withstand stresses, thereby improving the strength and stability of the material. The hollow glass beads have normal distribution in the particle size of 1-300 μm, have proper volume and good bead concentration, and can reflect sound waves in multiple angles and multiple layers in a larger range, so that the area of sound wave reflection is increased, the sound wave energy is consumed, and the sound insulation effect is improved.

In the present application, the particle size of the hollow glass microspheres includes, but is not limited to, 1 μm, 10 μm, 15 μm, 20 μm, 30 μm, 35 μm, 46 μm, 58 μm, 70 μm, 86 μm, 100 μm, 115 μm,

130μm、146μm、160μm、180μm、200μm、240μm、260μm、285μm、

300 μm, and the present application is not limited thereto.

In the present application, the epoxy resin includes at least one of E44, E51, and TDE 85; the coupling agent comprises KH-560 and/or KH570; the curing agent comprises at least one of polyetheramine, triethylene tetramine and p-toluenesulfonic acid; the accelerator comprises at least one of N, N-dimethylbenzylamine, maleic anhydride and triethanolamine.

(2) And (3) stirring and mixing the mixed material obtained in the step (1) with 1-40 parts of hollow glass beads, uniformly mixing, pouring into a mould, and carrying out vacuum defoaming treatment. As bubbles can affect the physical properties of the composite, such as mechanical strength and durability. Bubbles can be effectively removed from the material by vacuum debubbling. Vacuum debubbling can help ensure that the composite is more compact, reducing voids and interstices, and thus improving its physical properties. Meanwhile, by eliminating bubbles and gas gaps, the uniformity and quality of the material can be improved.

In the application, the stirring speed is 100-250r/min, and the stirring time is 10-60min.

In the application, the vacuum degree of the vacuum defoaming treatment is-0.05-0.1 MPa.

In the application, the time of the vacuum defoaming treatment is 0.5-24h.

(3) And (3) performing vibration treatment on the mixed system subjected to the vacuum defoaming treatment in the step (2), wherein the time of the vibration treatment is 30-120min. The vibration can help the residual micro bubbles or gas voids in the material rise to the surface of the material and escape rapidly. This helps to further reduce the number of bubbles in the material and improve the compaction of the material. Vibration may promote a tight alignment between particles or fillers in the material. After the vibration treatment, particles or fillers are more closely packed together, so that pores and gaps are reduced, and the compactness of the material is improved. The vibration treatment is also helpful for uniformly mixing different components (such as resin, filler, fiber and the like) together, and improving the stability of the performance of the composite material.

(4) And (3) curing the mixed system subjected to the vibration treatment in the step (3), for example, drying the mixed system in an electrothermal constant-temperature blast drying oven, wherein the flow rate of circulating blast air in the drying oven is 0.5-10m/s. Wherein the curing temperature is 50-65, and the curing time is 24-48h.

By the curing process, the resin matrix undergoes crosslinking or polymerization, thereby increasing the strength, hardness and stiffness of the material, which helps the sound insulation material to better withstand external forces and maintain its shape. The curing temperature is controlled to be 50-65 ℃, and the curing time is controlled to be 24-48 hours, so that the sound insulation material can be cured uniformly and fully in the whole volume. Within the above curing time and temperature ranges, the curing process is suitably fast, helping to reduce stress build-up within the material, which helps to improve the stability of the material.

In this application, hollow glass bead has the good acoustic sound insulation structure of potential: the shell is made of compact ceramic material, and the middle is filled with an air layer, so that a double-layer wall-like sound insulation structure can be formed. In addition, because the hollow glass beads are small in volume and large in quantity, the shell configuration combined with the radian of the hollow glass beads can enable sound waves to be reflected in multiple angles and multiple layers in a larger range, so that the sound wave energy is consumed, and the sound insulation effect is improved. The hollow glass beads are added into the epoxy resin, and the sound insulation effect of the epoxy resin can be further improved by adjusting the content of the hollow glass beads in the composite material; meanwhile, due to the synergistic effect of the chopped carbon fibers and the epoxy resin, the mechanical property of the composite material can be improved while the dispersibility and the sound insulation effect of the composite material are not affected, so that the composite material has higher practicability.

The hollow glass beads of the following examples were obtained from the national academy of sciences of physical and chemical technology institute of patent (CN 102583973A) and had a density of 0.35g/cm ³ The compressive strength is 20MPa, and the grain diameter is 1-300 mu m. The hollow glass beads used in the present application are hollow glass beads of mixed particle size, for example, hollow glass beads of 20 μm, 40 μm, 60 μm are used simultaneously, and hollow glass beads of a single particle size are not used. In addition, the proportion of the beads with different particle sizes is not particularly required, and the method is not limited, and only needs to meet the requirement that the particle size of a single hollow glass bead is 1-300 mu m.

The features and capabilities of the present application are described in further detail below in connection with the examples.

Example 1

The embodiment provides a sound insulation composite material, and the preparation method thereof comprises the following steps:

(1) 100g of epoxy resin E51, 40g of curing agent polyetheramine, 1g of accelerator N, N-dimethylbenzylamine, 2g of coupling agent KH-560 and chopped carbon fiber (with the diameter of 7 mu m) with the addition amount of 1% are stirred and mixed in a stirring reactor (150 r/min,10 min), and stirring is carried out under ultrasonic conditions, so that a mixed material is obtained.

(2) Stirring and mixing the mixed material obtained in the step (1) with 10g of hollow glass beads, uniformly mixing, pouring into a mould, and performing vacuum defoaming treatment, wherein the vacuum degree of the vacuum defoaming treatment is-0.1 MPa, and the vacuum defoaming treatment is performed for 5 hours; and then vibration treatment is carried out for 70min, and curing treatment is carried out for 24h in a 60-DEG F constant-temperature blast drying oven.

Example 2

This embodiment is substantially the same as embodiment 1 except that: and (3) adding 20g of hollow glass microspheres into the step (2).

Example 3

This embodiment is substantially the same as embodiment 1 except that: and (3) adding 30g of hollow glass microspheres into the step (2).

Example 4

This embodiment is substantially the same as embodiment 1 except that: 40g of hollow glass beads are added in the step (2).

Comparative example 1

This comparative example is substantially the same as example 1, except that: and (3) adding no hollow glass beads in the step (2).

Comparative example 2

This comparative example is substantially the same as example 1, except that: the diameter of the chopped carbon fibers was 4. Mu.m.

Comparative example 3

This comparative example is substantially the same as example 1, except that: the diameter of the chopped carbon fibers was 10. Mu.m.

Comparative example 4

This comparative example is substantially the same as example 1, except that: no chopped carbon fibers were added.

Comparative example 5

This comparative example is substantially the same as example 1, except that: the average particle size of the hollow glass beads is 350-400 mu m.

Comparative example 6

This comparative example is substantially the same as example 1, except that: the nanometer hollow glass bead (600-700 nm) is selected.

Test example 1

1. This test example the sound insulation composite materials of examples 1 to 4 and comparative examples 1 to 3 were subjected to sound absorption coefficient performance test.

Sound absorption coefficient: according to the GB/T18696.2-2002 standard, an SW422 type impedance tube acoustic tester of a detection laboratory of Beijing Polyis utilized to test the sound absorption coefficients of samples at different frequencies.

The specific test steps are as follows: processing a sample to be measured into a round shape with the size of about 90mm multiplied by 90mm at room temperature of 25.6; the connecting device is connected with the system by the large pipe, the double microphones are connected with corresponding special measuring cables, and the double microphones are inserted into the corresponding microphone positions of the impedance pipes. And calibrating the sounding test channel. After checking, turning on the computer and the power supply. In a software system, a material test program is selected for relevant settings. The sample to be tested is plugged into the impedance tube, and the first test is started; after the first test is completed, the exchange microphone performs a second test; repeating the operation until the test is finished. And finally, calculating by software to derive a sound absorption coefficient detection result.

The results of the above sound absorption coefficient performance test are shown in table 1.

TABLE 1

As can be seen from Table 1, the composite material has the best sound insulation performance when the mass ratio of the hollow glass beads to the epoxy resin is 0.1:1 in the range of 100-250Hz, because the unique hollow structure of the hollow glass beads continuously diffracts, scatters and refracts the transmitted sound waves, the transmission path of the sound waves is greatly increased, and the sound waves are dissipated and consumed in the transmission process.

As is clear from comparison of examples 1, comparative examples 2 and 3, the composite material is strong in the ability to absorb sound waves and high in the sound absorption coefficient when the chopped carbon fiber diameter is 6 to 8. Mu.m. This is because the chopped carbon fibers are not good for uniform mixing when the diameter is large; when the chopped carbon fiber diameter is small, the ability to absorb sound waves is reduced, resulting in a decrease in sound absorption coefficient. In comparative example 4, it was found that the sound absorption coefficient of the obtained composite material was somewhat lowered without adding the chopped carbon fibers, and thus it was indirectly revealed that the addition of the chopped carbon fibers had a certain auxiliary effect for enhancing the sound insulation effect. In comparative examples 5 and 6, the particle size of the hollow glass beads was changed, and larger hollow glass beads (> 300 μm) could be found, and the sound absorption coefficient of the composite material was decreased, because the diameter of the cavity was increased, which was unfavorable for uniform mixing of the beads and the resin matrix, and the cavity diameter was increased, and the reflection refractive index of the acoustic wave was decreased; the sound absorption coefficient of the composite material is greatly reduced when the nano-scale hollow glass microspheres are selected, and the sound absorption coefficient is greatly reduced because the nano-scale hollow microspheres are easy to agglomerate and difficult to disperse and uniformly absorb sound waves.

2. Test example the sound insulation composite materials of examples 1 to 4, comparative examples 1 to 3 were subjected to performance test with a 15X 12X 8cm building cement board purchased from Tianze seal building material company.

(1) Sound insulation performance test: three groups of noise are collected in the field in an application place, such as a dormitory environment and used as noise sources, the measured noise sources are all 80-250Hz, a sound insulation box body for measuring decibel quantity is customized, the sound insulation box body comprises a sound box and a sound receiving box, and a sample plate is arranged between the sound box and the sound receiving box.

In addition, a group of comparison groups are arranged, and a sample plate is not placed between the sounding box and the radio box, so that the sounding box and the radio box serve as blank comparison.

The specific operation steps are as follows: the collected noise source 1 is placed in a sound box, a decibel meter purchased from a Japanese three-quantity official network is placed in the sound box, a sample plate is placed in the middle of the box body to be tightly connected, corresponding data are measured, and the sample plate is replaced until all test groups are completed. Each test group is provided with three groups of parallel experiments, and the noise source 1, the noise source 2 and the noise source 3 are respectively used for testing, wherein the noise source 1, the noise source 2 and the noise source 3 are three sections of audio with different frequencies, the frequency of the noise source 1 is 200Hz-250Hz, the frequency 2 of the noise source is 100Hz-150Hz, and the frequency 3 of the noise source is 150Hz-200Hz; the average value of the decibels measured by the three groups is measured, and the difference value of the average value and the decibel value of the control group is used for representing the sound insulation performance.

(2) Compression properties (compressive strength, compression ratio) and tensile properties (tensile strength, elastic modulus).

Compressive strength: the composite material was cut into columnar bars of 10X 25mm, and the uniaxial compressive strength was measured as a sample by using the method for measuring the compressive properties of GB/T8813-2008 rigid foam. The load loading rate is 2mm/min, and the compressive strength calculation formula is:

p=f/(b×l) (1)

In the formula (1), P is the compressive strength of the sample, and the unit is kPa; f represents the maximum stress of the sample when yielding, and the unit is N; b represents the width of the sample, L represents the length of the sample, and the units are all mm.

Compression ratio: the calculation formula is as follows: f= (1-L'/L) ×100%.

L, L' is the original length of the sample and the length under maximum stress, respectively, in mm.

Tensile strength: the resulting composite material was cut into 10X 25mm columnar bars as a sample, and the uniaxial tensile strength was measured by a method for measuring the tensile properties of GB/9641-88 rigid foam. The load loading rate is 5mm/min, and the tensile strength calculation formula is:

p=f/(h×l) (2)

In the formula (2), P is the tensile strength of the sample, and the unit is MPa; f represents the maximum stress of the sample at break, and the unit is N; h represents the sample width, L represents the sample thickness, and the units are all mm.

Modulus of elasticity: the modulus of elasticity is the stress in the unidirectional stress state of the test specimen divided by the strain in that direction. The calculation formula is as follows:

e= (F/S)/(dL/L) 3

In the formula (3), F is the maximum stress of the sample at break, and the unit is N; s is the cross-sectional area of the sample in mm ² The method comprises the steps of carrying out a first treatment on the surface of the dL/L is the ratio of the elongation to the original length of the sample, and the units of the elongation and the original length are both mm.

The test results of the above sound insulation properties, compression properties and tensile properties are shown in Table 2.

TABLE 2

As can be seen from Table 2, the composite material at a mass ratio of hollow glass microspheres to epoxy resin of 0.1:1 showed the greatest decrease in decibels in the frequency range of 80-250Hz compared to the blank at three-stage noise in the frequency range of 80-250 Hz. And compared with the traditional cement board made of the sound insulation material, the compression strength of the composite material provided by the application is obviously increased, and the compression performance of the composite material is gradually increased along with the increase of the content of the hollow glass beads. However, as the content of hollow glass microspheres increases, the magnitude of the increase in compressive strength decreases, probably due to the unique hollow closed cell structure of the hollow glass microspheres, which results in an increase in the mechanical properties of the composite material due to the increased content of microspheres, as compared to conventional foam materials, which has a low density, high specific strength and stiffness. And as the content of the micro-beads increases to 40% (the mass ratio of the hollow glass micro-beads to the epoxy resin is 0.4:1), the dispersibility of the micro-beads among the epoxy resin is poor, and a large amount of agglomeration phenomenon occurs, so that the compression strength of the composite material is greatly reduced, the reinforcing effect of the hollow glass micro-beads on the compression performance of the material is counteracted, and the compression strength is reduced.

It can also be seen from Table 2 that the hollow glass microspheres were not added in comparative example 1, and the decibel reduction and mechanical properties of the composite material were reduced. As can be seen from the comparison of example 1, comparative example 2 and comparative example 3, the improvement of the sound insulation performance and mechanical properties of the composite material is more advantageous when the diameter of the chopped carbon fiber is 6-8 μm. In comparative example 4, no chopped carbon fiber is added, and the decibel reduction amount and mechanical property of the composite material are obviously reduced, which indicates that the addition of the chopped carbon fiber has a certain auxiliary effect on improving the sound insulation property of the composite material while improving the mechanical property of the composite material. As can be seen from the comparison of the example 1, the comparative example 5 and the comparative example 6, the hollow glass beads with the particle size of 1-300 μm are selected, which is more beneficial to improving the sound insulation performance and the mechanical property of the composite material; the hollow glass nanoparticle cannot enhance the sound insulation performance and mechanical property due to the smaller length-diameter ratio of the sphere. Although the tensile property of the composite material provided by the application is poorer than that of a traditional cement board, according to the international standard, the tensile strength requirement of the wall sound insulation material is more than 1.5MPa, namely, the composite material is qualified, the tensile strength of the sound insulation composite material prepared by the application reaches 6-10MPa, the composite material meets the international standard and can be produced and applied, and compared with the traditional cement board, the composite material is lighter in weight and still has better sound insulation performance under the light condition.

The embodiments described above are some, but not all, of the embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Claims

1. The sound insulation composite material is characterized by comprising epoxy resin, hollow glass beads, a curing agent, an accelerator, a coupling agent and chopped carbon fibers;

the mass ratio of the hollow glass beads to the epoxy resin is (0.01-0.5): 1; the mass ratio of the curing agent to the epoxy resin is (0.2-0.5): 1; the mass ratio of the accelerator to the epoxy resin is (0.01-0.2) 1; the mass ratio of the coupling agent to the epoxy resin is (0.001-0.03) 1; the addition amount of the chopped carbon fiber is 0.1-3% of the total mass of all raw materials;

the diameter of the chopped carbon fiber is 6-8 mu m, and the length is 0.5-1.0mm;

the particle size of the hollow glass beads is 1-300 mu m.

2. The composite material according to claim 1, wherein the mass ratio of the hollow glass microspheres to the epoxy resin is (0.09-0.41): 1; the mass ratio of the curing agent to the epoxy resin is (0.35-0.45): 1; the mass ratio of the accelerator to the epoxy resin is (0.05-0.15): 1; the mass ratio of the coupling agent to the epoxy resin is (0.015-0.025) 1; the addition amount of the chopped carbon fiber is 0.9-1.5% of the total mass of all raw materials.

3. The composite of claim 1, wherein the epoxy resin comprises at least one of E44, E51, and TDE 85.

4. A composite material according to any of claims 1-3, wherein the coupling agent comprises KH-560 and/or KH570;

optionally, the curing agent comprises at least one of polyetheramine, triethylenetetramine and p-toluenesulfonic acid;

optionally, the accelerator comprises at least one of N, N-dimethylbenzylamine, maleic anhydride, and triethanolamine.

5. A method of preparing a composite material according to any one of claims 1 to 4, comprising:

mixing the raw materials to obtain a mixed material; and sequentially carrying out vacuum defoamation, vibration and solidification treatment on the mixed material to obtain the composite material.

6. The method of preparing according to claim 5, wherein the mixing comprises:

firstly mixing other raw materials except the hollow glass beads, then adding the hollow glass beads for stirring, wherein the stirring is carried out under the ultrasonic condition to obtain the mixed material;

optionally, the stirring speed is 100-250r/min, and the stirring time is 10-60min.

7. The production method according to claim 5, wherein the vacuum degassing treatment comprises:

pouring the mixed material into a mould, and carrying out vacuum defoaming treatment;

optionally, the vacuum degree of the vacuum defoaming treatment is-0.05-0.1 MPa;

optionally, the time of the vacuum defoaming treatment is 0.5-24h.

8. The method according to any one of claims 5 to 7, wherein the time of the vibration treatment is 30 to 120min.

9. The method of any one of claims 5-7, wherein the curing conditions comprise:

the curing temperature is 50-65 deg.f and the curing time is 24-48 hr.

10. Use of a composite material according to any one of claims 1-4 in the field of residential building materials.