Ultrasonic sound absorption material and manufacturing process

Abstract

The invention discloses an ultrasonic sound absorption material, which comprises 20-50% of a polymer matrix, 20-50% of a curing agent, and 20-50% of a curing agent, wherein the polymer matrix comprises low-viscosity epoxy resin, a toughening modifier and a curing agent; the scattering absorption balls are made by wrapping rubber with spherical tungsten powder with the diameter smaller than 100 micrometers, the rubber accounts for 10%-30% of the weight of the tungsten powder, and the scattering absorption balls account for 38%-72% of the total weight; the thickness of the graphite flake is 0.05-1mm, and the graphite flake accounts for 8-12% of the total weight; the toughening modifier is one of liquid polysulfide and polyurethane; the curing agent is one of m-phenylenediamine, polyamide and phthalic anhydride; the preparation method has the beneficial effects that by optimizing the material composition and the preparation process, the preparation time is remarkably shortened, and the production efficiency is improved; due to unique material combination and structural design, the ultrasonic sound absorption material has better acoustic absorption and scattering performance; the device is suitable for the fields of ultrasonic probes, acoustics laboratories and noise control, and has wide market prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of ultrasonic sound absorbing materials, and in particular relates to an ultrasonic sound absorbing material and a manufacturing process. Background Art

[0002] Ultrasonic sound absorbing materials, often referred to as backing materials in the application of ultrasonic probes, are an important component of ultrasonic probes. The backing material of an ultrasonic probe is a special material that is located behind the piezoelectric element of the ultrasonic probe. Its main function is to absorb the sound energy radiated into the probe by the piezoelectric element due to vibration, and to prevent the sound energy from being reflected back and transmitted to the piezoelectric element to cause interference. This material needs to have an acoustic impedance that matches the piezoelectric material, and can greatly absorb the sound signal and attenuate it to a minimum.

[0003] The main function of the backing material is to absorb the excess acoustic energy generated by the piezoelectric element and prevent the energy from being reflected inside the probe, thereby avoiding interference with the ultrasound image. By absorbing the acoustic energy, the backing material helps to reduce clutter and artifacts in the ultrasound image and improve the image clarity and resolution. The backing material can also protect the piezoelectric element and prevent it from being damaged by prolonged exposure to acoustic energy.

[0004] The patent publication number is CN106483200A, which discloses a sound-absorbing backing material for ultrasonic probes and a preparation method thereof. The patent discloses that the backing material comprises the following components in percentage by mass: 1% to 10% of phenol ether alcohol glycidyl ether, 0.1% to 0.5% of coupling agent, 0.1% to 0.5% of white carbon black, 0.3% to 3% of curing agent, and 86% to 98.5% of tungsten powder; the preparation method thereof is as follows: phenol ether alcohol glycidyl ether, coupling agent, white carbon black, and curing agent are uniformly mixed, stirred for 10±0.1 minutes, tungsten powder is added, stirred for 10±0.1 minutes, and ground and mixed to obtain a uniformly dispersed mixture; the mixture is placed in an oven for heating and curing, maintained at 120±0.1°C for 2-3 hours, and cooled to obtain the sound-absorbing backing material.

[0005] Although the patent with publication number CN106483200A provides a sound-absorbing backing material for ultrasonic probes and a preparation method thereof, its components and preparation process are relatively complex, and the acoustic performance still has room for improvement. Summary of the invention

[0006] The object of the present invention is to provide an ultrasonic sound absorbing material and a manufacturing process, so that the acoustic performance is better and the preparation efficiency is higher.

[0007] To achieve the above object, the present invention provides the following technical solution: an ultrasonic sound absorbing material, comprising

[0008] Polymer matrix: comprising low viscosity epoxy resin, toughening modifier and curing agent, the polymer matrix accounts for 20%-50% of the total weight;

[0009] Scattering absorption ball: It is made of spherical tungsten powder with a diameter less than 100μm wrapped in rubber, the rubber accounts for 10%-30% of the weight of the tungsten powder, and the scattering absorption ball accounts for 38%-72% of the total weight;

[0010] Graphite flakes: 0.05-1mm thick, accounting for 8-12% of the total weight.

[0011] As a preferred technical solution of the present invention, the toughening modifier is one of liquid polysulfide and polyurethane.

[0012] As a preferred technical solution of the present invention, the curing agent is one of m-phenylenediamine, polyamide and phthalic anhydride.

[0013] As a preferred technical solution of the present invention, the rubber is one of EPDM rubber, styrene-butadiene rubber and silica gel.

[0014] The present invention also discloses a manufacturing process of an ultrasonic sound absorbing material, and the manufacturing process is as follows:

[0015] Step 1: Mix tungsten powder and rubber evenly, vulcanize, crush into tungsten-rubber balls, and separate by particle size through a sample sieve;

[0016] Step 2: Arrange and fix the graphite sheets at a predetermined interval;

[0017] Step 3: Prepare a thin material containing liquid low-viscosity epoxy resin, toughening modifier and curing agent, mix them evenly with tungsten-rubber balls, and perform vacuum degassing treatment;

[0018] Step 4: pour the degassed thin material into the gaps between the fixed graphite sheets, vibrate to degas, and then perform pressure curing;

[0019] Step 5: After curing, cut into sheets or blocks of the desired shape.

[0020] As a preferred technical solution of the present invention, in the step 2, the predetermined spacing is 1-6 mm.

[0021] As a preferred technical solution of the present invention, tungsten powder and rubber are uniformly mixed and vulcanized, crushed into tungsten-rubber balls, and separated by particle size through a sample sieve. The specific implementation method is as follows:

[0022] Mix tungsten powder, rubber and required additives in a mixer, and mix to make each component fully and evenly dispersed to form a uniform mixture;

[0023] Process the uniformly mixed materials into the desired shape by calendering, extrusion or compression molding;

[0024] Place the formed material in a vulcanizing device and vulcanize at 140-160°C for 5-10 minutes;

[0025] The vulcanized product is crushed mechanically;

[0026] The crushed product is sieved using a sample sieve to separate particles of different particle sizes.

[0027] As a preferred technical solution of the present invention, the screening mesh number is 20-200.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] By optimizing the material composition and preparation process, the preparation time is significantly shortened and the production efficiency is improved;

[0030] The unique material combination and structural design make the ultrasonic sound absorbing material have better acoustic absorption and scattering performance;

[0031] It is suitable for multiple fields such as ultrasonic probes, acoustic laboratories, and noise control, and has broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flow chart of the manufacturing process of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] See also Figure 1 , which is the first embodiment of the present invention, provides an ultrasonic sound absorbing material, comprising

[0036] Polymer matrix: comprising low viscosity epoxy resin, toughening modifier and curing agent, the polymer matrix accounts for 20% of the total weight; the toughening modifier is liquid polysulfide; the curing agent is m-phenylenediamine;

[0037] Scattering absorption ball: It is made of spherical tungsten powder with a diameter less than 100μm wrapped in rubber, the rubber accounts for 10% of the weight of the tungsten powder, and the scattering absorption ball accounts for 72% of the total weight; the rubber is EPDM rubber;

[0038] Graphite flakes: 0.05mm thick, 8% of the total weight.

[0039] A process for producing an ultrasonic sound-absorbing material comprises the following steps:

[0040] Step 1: Mix tungsten powder and rubber evenly, then vulcanize, crush into tungsten-rubber balls, and separate by particle size through a sample sieve; the specific implementation method is as follows: mix tungsten powder, rubber and required additives in a mixer, and make each component fully and evenly dispersed by mixing to form a uniform mixture; process the mixed material into the required shape by calendering, extrusion or compression molding; place the molded material in a vulcanization equipment and vulcanize at 140°C for 10 minutes; the vulcanized product is mechanically crushed; use a sample sieve to screen the crushed product to separate particles of different particle sizes, the screening mesh number is 20, and during the screening process, when the material passes through the screen, particles with a particle size larger than the screen hole are retained on the screen, while particles with a particle size smaller than the screen hole pass through the screen and fall into the collection container below. By adjusting the aperture of the screen and the screening time, products with different particle size ranges can be obtained;

[0041] Step 2: Arrange and fix the graphite sheets at a predetermined interval of 1 mm;

[0042] Step 3: Prepare a thin material containing liquid low-viscosity epoxy resin, toughening modifier and curing agent, mix them evenly with tungsten-rubber balls, and perform vacuum degassing treatment;

[0043] Step 4: pour the degassed thin material into the gaps between the fixed graphite sheets, vibrate to degas, and then perform pressure curing;

[0044] Step 5: After curing, cut into sheets or blocks of the desired shape.

[0045] Example 2

[0046] See also Figure 1 , which is a second embodiment of the present invention, provides an ultrasonic sound absorbing material, comprising

[0047] Polymer matrix: comprising low viscosity epoxy resin, toughening modifier and curing agent, the polymer matrix accounts for 35% of the total weight; the toughening modifier is polyurethane; the curing agent is polyamide;

[0048] Scattering absorption ball: It is made of spherical tungsten powder with a diameter less than 100μm wrapped in rubber, the rubber accounts for 20% of the weight of the tungsten powder, and the scattering absorption ball accounts for 55% of the total weight; the rubber is styrene-butadiene rubber;

[0049] Graphite flakes: 0.5mm thick, 10% of the total weight.

[0050] A process for producing an ultrasonic sound-absorbing material comprises the following steps:

[0051] Step 1: Mix tungsten powder and rubber evenly, then vulcanize, crush into tungsten-rubber balls, and separate by particle size through a sample sieve; the specific implementation method is as follows: mix tungsten powder, rubber and required additives in a mixer, and make each component fully and evenly dispersed by mixing to form a uniform mixture; process the mixed material into the required shape by calendering, extrusion or compression molding; place the molded material in a vulcanization equipment and vulcanize at 150°C for 8 minutes; the vulcanized product is mechanically crushed; use a sample sieve to screen the crushed product to separate particles of different particle sizes, the screening mesh number is 110, and during the screening process, when the material passes through the screen, particles with a particle size larger than the screen hole are retained on the screen, while particles with a particle size smaller than the screen hole pass through the screen and fall into the collection container below. By adjusting the aperture of the screen and the screening time, products with different particle size ranges can be obtained;

[0052] Step 2: Arrange and fix the graphite sheets at a predetermined interval of 3 mm;

[0053] Step 3: Prepare a thin material containing liquid low-viscosity epoxy resin, toughening modifier and curing agent, mix them evenly with tungsten-rubber balls, and perform vacuum degassing treatment;

[0054] Step 4: pour the degassed thin material into the gaps between the fixed graphite sheets, vibrate to degas, and then perform pressure curing;

[0055] Step 5: After curing, cut into sheets or blocks of the desired shape.

[0056] Example 3

[0057] See also Figure 1 , which is the third embodiment of the present invention, provides an ultrasonic sound absorbing material, comprising

[0058] Polymer matrix: comprising low viscosity epoxy resin, toughening modifier and curing agent, the polymer matrix accounts for 50% of the total weight; the toughening modifier is liquid polysulfide; the curing agent is phthalic anhydride;

[0059] Scattering absorption ball: It is made of spherical tungsten powder with a diameter less than 100μm wrapped in rubber, the rubber accounts for 30% of the weight of the tungsten powder, and the scattering absorption ball accounts for 38% of the total weight; the rubber is silica gel;

[0060] Graphite flakes: 1mm thick, 12% of the total weight.

[0061] A process for producing an ultrasonic sound-absorbing material comprises the following steps:

[0062] Step 1: Mix tungsten powder and rubber evenly, then vulcanize, crush into tungsten-rubber balls, and separate by particle size through a sample sieve; the specific implementation method is as follows: mix tungsten powder, rubber and required additives in a mixer, and make each component fully and evenly dispersed by mixing to form a uniform mixture; process the mixed material into the required shape by calendering, extrusion or compression molding; place the molded material in a vulcanization equipment and vulcanize at 160°C for 5 minutes; the vulcanized product is mechanically crushed; use a sample sieve to screen the crushed product to separate particles of different particle sizes, the screening mesh number is 200, and during the screening process, when the material passes through the screen, particles with a particle size larger than the screen hole are retained on the screen, while particles with a particle size smaller than the screen hole pass through the screen and fall into the collection container below. By adjusting the aperture of the screen and the screening time, products with different particle size ranges can be obtained;

[0063] Step 2: Arrange and fix the graphite sheets at a predetermined interval of 6 mm;

[0064] Step 3: Prepare a thin material containing liquid low-viscosity epoxy resin, toughening modifier and curing agent, mix them evenly with tungsten-rubber balls, and perform vacuum degassing treatment;

[0065] Step 4: Pour the degassed thin material directly into the mold for vibration degasing and pressure curing;

[0066] Step 5: After curing, first cut into the basic shape, then overlap the graphite sheet on the surface or inside of the material, and finally cut and shape the whole.

[0067] Although the embodiments of the present invention have been shown and described, as detailed above, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultrasonic sound absorbing material, characterized in that: include Polymer matrix: comprising low viscosity epoxy resin, toughening modifier and curing agent, the polymer matrix accounts for 20%-50% of the total weight; Scattering absorption ball: It is made of spherical tungsten powder with a diameter less than 100μm wrapped in rubber, the rubber accounts for 10%-30% of the weight of the tungsten powder, and the scattering absorption ball accounts for 38%-72% of the total weight; Graphite flakes: 0.05-1mm thick, accounting for 8-12% of the total weight.

2. The ultrasonic sound absorbing material according to claim 1, characterized in that: The toughening modifier is one of liquid polysulfide and polyurethane.

3. The ultrasonic sound absorbing material according to claim 1, characterized in that: The curing agent is one of m-phenylenediamine, polyamide and phthalic anhydride.

4. The ultrasonic sound absorbing material according to claim 1, characterized in that: The rubber is one of EPDM rubber, styrene-butadiene rubber and silica gel.

5. A process for producing an ultrasonic sound absorbing material according to any one of claims 1 to 4, characterized in that: The manufacturing process is as follows: Step 1: Mix tungsten powder and rubber evenly, vulcanize, crush into tungsten-rubber balls, and separate by particle size through a sample sieve; Step 2: Arrange and fix the graphite sheets at a predetermined interval; Step 3: Prepare a thin material containing liquid low-viscosity epoxy resin, toughening modifier and curing agent, mix them evenly with tungsten-rubber balls, and perform vacuum degassing treatment; Step 4: pour the degassed thin material into the gaps between the fixed graphite sheets, vibrate to degas, and then perform pressure curing; Step 5: After curing, cut into sheets or blocks of the desired shape.

6. The process for producing an ultrasonic sound absorbing material according to claim 5, characterized in that: In the step 2, the predetermined spacing is 1-6 mm.

7. The process for producing an ultrasonic sound absorbing material according to claim 5, characterized in that: The tungsten powder and rubber are mixed evenly and then vulcanized, crushed into tungsten-rubber balls, and separated by particle size through a sample sieve. The specific implementation method is as follows: Mix tungsten powder, rubber and required additives in a mixer, and mix to make each component fully and evenly dispersed to form a uniform mixture; Process the uniformly mixed materials into the desired shape by calendering, extrusion or compression molding; Place the formed material in a vulcanizing device and vulcanize at 140-160°C for 5-10 minutes; The vulcanized product is crushed mechanically; The crushed product is sieved using a sample sieve to separate particles of different particle sizes.

8. The process for producing an ultrasonic sound absorbing material according to claim 7, characterized in that: The screening mesh is 20-200.

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