TWI806065B - Sound absorbing composite layer and sound absorbing composite material as well as method for manufacturing sound absorbing carbon powders - Google Patents

Abstract

The present invention relates to a sound absorbing composite layer, a sound absorbing composite material as well as a method for manufacturing sound absorbing carbon powders. The method includes: putting carbon powders in a confined space; performing a heating process in the confined space; performing an oxygen supplemental process in the confined space; performing said heating process and said oxygen supplemental process each at least once; thereby producing sound absorbing carbon powders. Accordingly, a sound absorbing composite material can be formed by mixing the sound absorbing carbon powders with glass fragments. Furthermore, a sound absorbing composite layer can be formed by mixing the sound absorbing carbon powder (or the sound absorbing composite material) with a concrete. The present invention provides an improved sound absorbing effect.

Description

Sound-absorbing composite layer, sound-absorbing composite material and method for making sound-absorbing carbon powder

The invention relates to a composite layer with the best sound-absorbing effect, a composite material and a method for making sound-absorbing carbon powder.

At present, in order to improve the overall sound insulation effect of general buildings, various sound-absorbing materials and panels are mainly used to achieve the sound-absorbing effect.

For example, there is a new patent No. M552519 "a fireproof board structure with sound-absorbing and sound-insulating performance" announced on December 1, 2016 in the Republic of China, which discloses: a substrate body composed of a plurality of fiber groups, a A shaped cover with heat insulation performance, a buffer filler with sound absorption performance and a plurality of barrier particles with sound insulation performance. The barrier particles are preferably environmentally friendly toner particles made by recycling waste mushroom cultivation space packs. They are evenly mixed with the shaped covering to coat the surrounding surface of the substrate body and to fill and coat its supporting network and Holes are used to strengthen the structural strength of the substrate body. At the same time, the surrounding surface of the barrier particles is formed to generate higher-density fine pores in the shaped covering, which helps to reduce the sound wave amplitude, and a shock-absorbing sound insulation network is jointly constructed in the cross-section of the plurality of barrier particles. Accordingly, the structural strength of the fireproof board is improved and the performance of sound absorption and sound insulation is compatible.

Invention No. 202009288 "Heat Transfer Material with Good Sound Absorbing Properties" patent published on March 1, 2019 in the Republic of China disclosed that it has a flow resistance of 60Pa*s/m to 400Pa*s/m , preferably a flow resistance of 100Pa*s/m to 300Pa*s/m, more preferably a flow resistance of 120Pa*s/m to 250Pa*s/m, The heat transfer material has a textile fabric and a heat-conducting coating comprising graphite, wherein the graphite is contained in a proportion of 5% to 50% by weight, based on the total weight of the heat transfer material.

However, the manufacturing method of the sound-absorbing material in the above-mentioned patent is cumbersome and time-consuming, and there are many types of raw materials to choose from, which relatively causes a significant increase in manufacturing costs, and in order to achieve a better sound-absorbing effect, the overall volume is large and the weight is heavy. , Occupy the storage space and are not easy to transport and other shortcomings.

Therefore, in view of the above-mentioned shortcoming that current sound-absorbing materials and sound-absorbing layers etc. have. Therefore, the present invention provides a method for making sound-absorbing carbon powder, which includes: placing a carbon powder in a closed space; applying a heat treatment to the closed space, so that the temperature of the closed space is between 800 and 1300° C. between; open the closed space to perform a supplementary oxygen treatment, add oxygen into the closed space, and then close the closed space; perform the heat treatment and the supplementary oxygen treatment at least once each, so as to purify the precision of the carbon powder; to make Become the toner with sound-absorbing effect.

The above-mentioned carbon powder is placed in a crucible, and then a cover is used to cover the crucible, so that the inside of the crucible is formed as the closed space, and the closed space is heated by a microwave with a power of 300~500 watts for 5~10 Minutes, then lift the cover, so that the outside air can enter the confined space, the ratio of the carbon powder to the air is 1 g: 30~70 ml, and then cover the cover on the air after 5 to 15 seconds Crucible to seal the confined space.

The above heat treatment and the supplemental oxygen treatment are performed three or four times, with an interval of 300-600 seconds between each cycle.

The present invention is also a kind of sound-absorbing toner, which is made according to the above-mentioned production method of sound-absorbing toner, so as to produce the toner with a sound-absorbing effect of 5-15 decibels per cubic centimeter.

The present invention is also a sound-absorbing composite layer, which includes the above-mentioned sound-absorbing carbon powder, which is to mix the sound-absorbing carbon powder with a concrete at a ratio of 1:75 to 1:200, add an appropriate amount of water, and wait until the sound-absorbing carbon powder is finished. After the concrete is solidified, it forms the sound-absorbing composite layer.

The present invention is also a method for making a sound-absorbing composite material, which includes: mixing a carbon powder and a glass shard into a closed space, the mixing ratio of the carbon powder and the glass shard is 2:1; for the Applying a heat treatment to the enclosed space, so that the temperature of the enclosed space is between 800 and 1300°C; opening the enclosed space for supplementary oxygen treatment, adding fresh oxygen into the enclosed space, and then closing the enclosed space; executing The heat treatment and the supplemental oxygen treatment are performed at least once each, so as to purify the carbon powder and the glass shards, and compound the carbon powder into the glass shards to produce a sound-absorbing composite material.

Put the above carbon powder and the glass fragments into a crucible after mixing, and then cover the crucible with a cover, so that the inside of the crucible forms the closed space, and applies a power of 300~500 to the closed space Wazhi Microwave conducts microwave heating for 5-10 minutes, and then lifts the cover, so that the outside air can enter the confined space. The ratio of the carbon powder to the air is 1 gram: 30-70 ml, within 5-15 seconds Then cover the crucible with the cover to seal the airtight space.

The above heat treatment and the supplemental oxygen treatment are performed three or four times.

The present invention is also a sound-absorbing composite material, which is made by the above-mentioned manufacturing method of the sound-absorbing composite material, and the diameter of the sound-absorbing composite material is between 0.05 and 5 mm.

The present invention is also a sound-absorbing composite layer, which includes the above-mentioned sound-absorbing composite material, which is to mix the sound-absorbing composite material with a concrete at a ratio of 1:1000~1:2000, add an appropriate amount of water, and wait for the sound-absorbing carbon powder After the concrete is solidified, it forms the sound-absorbing composite layer.

The above technical features have the following advantages:

1. The produced sound-absorbing toner has excellent purification precision and can achieve the best sound-absorbing effect.

2. The sound-absorbing composite material made of carbon powder fused into glass fragments can also achieve the best sound-absorbing effect.

3. The sound-absorbing composite layer made of sound-absorbing carbon powder or sound-absorbing composite material mixed with concrete can also achieve the best sound-absorbing effect.

4. By using the toner in the confined space with a temperature between 800 and 1300°C, the precision of purifying the toner can be achieved through cyclic sealing and supplementary oxygen treatment, so as to moderately remove low-molecular-weight carbon, amorphous carbon and At the same time, it has the effect of activating the carbon powder and its sound absorption. Because oxygen moderately attacks the surface of the carbon powder, it forms molecular-level bond-breaking defects or there is no stable bond around the carbon atoms on the surface. The sound-absorbing effect of general carbon powder, every There are 1~3 decibels per cubic centimeter. In the past, the sound-absorbing effect of activated carbon powder has not been published, and how to improve the sound-absorbing effect of carbon powder has not been mentioned. Not known technology. The heating temperature is between 800 and 1300°C, which is obtained by integrating the design of toner powder precision and surface defects (which can properly provide sound absorption effect and withstand multiple continuous heating) and the number of cycles. Excessive oxygen will burn the carbon Powder, the temperature higher than 1300 ° C will greatly promote the combustion of carbon powder, and both are unfavorable to the sound absorption effect, too little oxygen and the temperature lower than 800 ° C will have no activation effect, not a person with ordinary knowledge in the technical field of the invention, Knowing the sound-absorbing key of activated carbon powder, and through simple experimental operation and instrument measurement, it can be easily adjusted to make the carbon powder with a sound-absorbing effect of 5-15 decibels per cubic centimeter.

5. Apply a microwave heating treatment to the confined space, place the crucible in a microwave space, and perform microwave heating treatment on it, apply a power of 300~500 watts to heat the crucible for 5~10 minutes, The temperature of the closed space inside the crucible is between 800 and 1300°C by integrating the design of carbon powder precision and surface defects (which can properly provide sound absorption and withstand multiple continuous heating), microwave power crucible and circulation Too high power will greatly support the combustion of the carbon powder, and the carbon powder cannot be properly compounded in the glass shards. It is not a suitable sound-absorbing structure, and it is not good for the sound-absorbing effect. Too low microwave power and temperatures below 800°C The temperature has no activation effect, and the carbon powder cannot be compounded in the glass shards. It is not a person with common knowledge in the technical field of the invention, which is a suitable sound-absorbing structure, and by simple Experimental operation and instrument measurement can be easily adjusted to complete the production, so that the carbon powder is compounded in the glass shards and has a sound-absorbing effect.

1: Toner

2: Crucible

21: cover body

22: Confined space

3: Microwave oven

4:Bluetooth speaker

41:Acrylic tube

42: Sound-absorbing toner

43: toilet paper

5: glass shards

6: Sound-absorbing composite layer

61: Sound-absorbing toner

62: Concrete

71: Sound-absorbing composite materials

7: Sound-absorbing composite layer

72: Concrete

a: sample

b: sample

c: sample

d: sample

[Fig. 1] is a flowchart of a method for making sound-absorbing toner according to an embodiment of the present invention.

[The second figure] is a schematic diagram of putting carbon powder into the crucible according to the embodiment of the present invention.

[The third figure] is a schematic diagram of placing the crucible in the microwave oven according to the embodiment of the present invention.

[Figure 4] is a schematic diagram of the experimental test of the sound-absorbing effect of the sound-absorbing carbon powder of the embodiment of the present invention.

[FIG. 5] is a flow chart of a method for making a sound-absorbing composite material according to an embodiment of the present invention.

[Figure 6] is a schematic diagram of putting carbon powder and glass shards together with a crucible into a microwave oven according to an embodiment of the present invention.

[Figure 7] is a schematic diagram of a sound-absorbing composite layer with sound-absorbing carbon powder according to an embodiment of the present invention.

[Figure 8] is a schematic diagram of a sound-absorbing composite layer with a sound-absorbing composite material according to an embodiment of the present invention.

[Figure 9] is a schematic diagram of the change curve of the double-frequency sound insulation value of the sound-absorbing composite layer of the embodiment of the present invention in the sound-absorbing experiment test.

Please refer to the first figure, the embodiment of the present invention is a method for making sound-absorbing toner, which includes the following steps, wherein:

A. Put a toner into a closed space. As shown in the second figure, an appropriate amount of carbon powder 1 is put into a crucible 2, and then a cover 21 is used to cover the crucible 2, so that the inside of the crucible 2 is formed as the closed space 22. The addition amount of this carbon powder 1 accounts for 70% to 80% of this closed space 22 volumes, is optimal with 75%.

B. Applying a heat treatment to the enclosed space. As shown in the third figure, the crucible 2 is placed in a microwave space and subjected to microwave heating treatment. The microwave space can be a microwave oven 3 . The microwave heating treatment is to apply a power of 300-500 watts to heat the crucible 2 for 5-10 minutes, so that the temperature of the closed space 22 inside the crucible 2 is between 800 and 1300° C. The carbon powder 1 of molecular weight carbon, amorphous carbon and impurities can be burned, and low molecular weight carbon, amorphous carbon and impurities with lower ignition point can be burned, leaving only highly crystalline carbon to purify the carbon powder 1 precision.

C. Apply supplemental oxygen treatment to the confined space. Lift the cover 21 from the microwave oven 3, so that the outside air can enter the closed space 22. The ratio of the carbon powder 1 to the air is 1 gram: 30 ~ 70 ml, so as to add fresh air to the closed space 22. Oxygen, so that the carbon powder 1 can continue to activate and burn, and then cover the crucible 2 with the cover 21 after 5 to 15 seconds, so that the closed space 22 can continue to be heated.

D. Carry out the heat treatment of the above step B and the supplementary oxygen treatment of the step C at least once each. In the step C, the cover 21 can be opened to separate it from the crucible 2 for 5 to 15 seconds, and after the cover 21 covers the crucible 2, immediately place the crucible 2 in the microwave oven 3 immediately. Then heat the crucible 2 with a power of 300-500 watts for 5-10 minutes, then lift the cover 21 to separate it from the crucible 2 for 5-15 seconds, and then cover the cover 21 for a total of three to four times. times, each cycle interval is 300~600 seconds. In the embodiment of the present invention, as long as the microwave heating treatment of the above-mentioned step B and the supplementary oxygen treatment of the step C are repeated three times, the carbon powder in the confined space can reach the precision of purifying carbon powder to remove low molecular weight carbon, amorphous The role of carbon and impurities. The number of repetitions in the embodiment of the present invention is optimal at four times. The number of repetitions is directly proportional to the precision of the toner.

E. Made into a sound-absorbing toner. After the closed space 22 is cooled, the carbon powder 1 can be taken out to form the sound-absorbing carbon powder with sound-absorbing effect. By applying a heat treatment to the closed space, the temperature of the closed space is between 800 and 1300° C., so as to produce the toner with a sound absorption effect of 5 to 15 decibels per cubic centimeter.

The sound-absorbing toner prepared in the embodiment of the present invention was tested for sound-absorbing effect. As shown in the fourth figure, a bluetooth speaker 4 is first placed in an acrylic tube 41, and the bluetooth speaker 4 can emit sound with a frequency between 250hz~350hz. Then the sound-absorbing toner 42 is placed between the two toilet papers 43 and fixed, and then the fixed two toilet papers 43 and the sound-absorbing toner 42 are covered on the acrylic tube 41 . In order to test the sound emitted by the Bluetooth speaker 4, it can reduce the sound absorption effect by more than 10 decibels (db), that is, the sound-absorbing carbon powder 42 has a sound absorption effect of 5-15 decibels per cubic centimeter.

As shown in the fifth figure and the sixth figure, the embodiment of the present invention is a method for making a sound-absorbing composite material. The sound-absorbing composite material includes: carbon powder 1 and glass fragments 5, wherein:

A1. Put a carbon powder and a piece of glass into a closed space. As shown in the second figure, the carbon powder 1 and the glass shards are added into the crucible 2 at a mixing ratio of 2:1, and then the cover 21 is used to cover the crucible 2, so that the crucible 2 The inside is formed as this closed space 22 . The amount of addition of the carbon powder 1 and the glass shards 5 accounts for 70% to 80% of the volume of the closed space 22, and 75% is the best.

B1. Applying a heat treatment to the closed space. And put this crucible 2 in a microwave space, and carry out microwave heat treatment to it, and this microwave space system can be a microwave oven 3. The microwave heating treatment is to apply a power of 300-500 watts to heat the crucible 2 for 5-10 minutes, so that the temperature of the closed space 22 inside the crucible 2 is between 800 and 1300 ° C, so that the low-molecular-weight The carbon powder 1 of carbon, amorphous carbon and impurities can be burned, and the carbon powder 1 is compounded in the glass cullet 5 .

C1. Supplementary oxygen treatment for the confined space. Lift the cover 21 from the microwave oven 3, so that the outside air can enter the closed space 22. The ratio of the carbon powder 1 to the air is 1 gram: 30 ~ 70 ml, so as to add fresh air to the closed space 22. oxygen, so that the carbon powder 1 can continue to burn, and then cover the lid 21 on the crucible 2 after 5 to 15 seconds, so that the closed space 22 can continue to be heated.

D1. Carry out the heat treatment of the above-mentioned step B1 and the supplementary oxygen treatment of the step C1 at least once each. In this step C, the lid 21 can be opened to separate it from the crucible 2 for 5 to 15 seconds, and then the lid 21 After covering the crucible 2, put the crucible 2 into the microwave oven 3 and immediately heat the crucible 2 with a power of 300-500 watts for 5-10 minutes, and then lift the cover 21 to make it fit with the crucible 2. After being separated for 5 to 15 seconds, cover the cover body 21 again for a total of three to four times, with an interval of 300 to 600 seconds between each cycle. In the embodiment of the present invention, as long as the above-mentioned heat treatment of step B1 and supplementary oxygen treatment of step C1 are repeated three times, the carbon powder 1 in the enclosed space 22 can reach the precision of purifying carbon powder, so as to remove low molecular weight carbon, non- The role of crystalline carbon and impurities, and recombined into the glass shards 5. The number of repetitions in the embodiment of the present invention is optimal at four times. The number of repetitions is directly proportional to the precision of the toner.

E1. Made into a sound-absorbing composite material. After cooling the closed space 22, take out the glass shards 5 compounded with the carbon powder 1 to form the sound-absorbing composite material with sound-absorbing effect, and the diameter of the sound-absorbing composite material is between 0.05 and 5 mm.

As shown in the seventh figure, the third embodiment of the present invention is a sound-absorbing composite layer 6 having the above-mentioned sound-absorbing carbon powder 61 . After the sound-absorbing toner 61 and concrete 62 are fully mixed at a ratio of 1:75 to 1:200, then they are shaped into shapes, and after the sound-absorbing toner 61 and the concrete 62 are cured, a sound-absorbing structure is formed. Functional sound-absorbing composite layer 6, the sound-absorbing composite layer 6 is cement brick, sound-absorbing brick, sound-absorbing wall or sound-absorbing floor. The composition ratio of the concrete 62 is stone (coarse aggregate): sand (fine aggregate): cement: water=4:3~1.5:1.3~0.7:0.6~0.4.

As shown in Figure 8, the fourth embodiment of the present invention is a sound-absorbing composite layer 7 having the above-mentioned sound-absorbing composite material 71 . After fully mixing the sound-absorbing composite material 71 and concrete 72 at a ratio of 1:1000 to 1:2000, add an appropriate amount of water, and then shape it, and wait for the sound-absorbing composite material 71 and the concrete 72 to solidify, Then form a sound-absorbing composite layer 7 with sound-absorbing effect, and the sound-absorbing composite layer 7 is cement brick, sound-absorbing brick, sound-absorbing wall or sound-absorbing floor.

The sound-absorbing composite layer made in the fourth embodiment of the present invention was used to carry out the experimental test of the sound-absorbing effect, and a sample a and a sample b were used to measure the sound insulation. The size of the sample a is a cement brick of 1500mm (height)*1500mm (width)*35mm (thickness). The temperature and humidity during the test were 26.6°C and 62% respectively. The size of the sample b is 1500mm (height) * 1500mm (width) * 35mm (thickness), the cement brick contains glass fragments (153g-2.13g/cm ³ ), the temperature and humidity during the test are 28.1 ℃ and 62% respectively . The samples a and b were tested in 1/3 octave frequency band (Hz) respectively, and the obtained sound insulation value (dB) data of each octave frequency is shown in Table 1 below. The change curve of the sound insulation value of each octave is shown in the ninth figure.

The above experimental data shows that the STC grade of the sample b fully complies with the ASTM E413 sound insulation performance test standard. The standard declared value Rw(C; Ctr) also complies with the standard of CNS 8465-1 "Acoustics - Evaluation of sound insulation of buildings and building components - Air sound insulation". It can be proved that the sound-absorbing composite layer of the embodiment of the present invention can indeed achieve the effect of sound-absorbing.

The sound-absorbing composite layer made by the third embodiment of the present invention, that is, the concrete composite layer with sound-absorbing carbon powder, is tested. The size of the sample c is 500mm (height) * 500mm (width) * 35mm (thick). cement brick. The size of the sample d is 1500mm (height) * 1500mm (width) * 35mm (thick) cement brick containing glass fragments (16g-0.23g/cm3). The samples c and d were tested in the frequency band (Hz), and the obtained data of the sound insulation value (dB) of each octave is shown in Table 2 below.

Based on the description of the above-mentioned embodiments, it is possible to fully understand the operation of the present invention, use and the effect that the present invention produces, but the above-mentioned embodiments are only preferred embodiments of the present invention, and should not be used to limit the implementation of the present invention. The scope, that is, the simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the description of the invention, all fall within the scope of the present invention.

Claims (6)

A method for making sound-absorbing carbon powder, comprising: placing a carbon powder in a closed space, placing the carbon powder in a crucible, and covering the crucible with a cover, so that the crucible The interior is formed as the enclosed space, and the amount of carbon powder added accounts for 75% of the volume of the enclosed space; a heat treatment is applied to the enclosed space, and the enclosed space is heated by a microwave with a power of 300~500 watts for 5~10 minutes , so that the temperature of the enclosed space is between 800 and 1300°C; open the enclosed space to perform a supplementary oxygen treatment, and then lift the cover so that the outside air can enter the enclosed space, the carbon powder and the The air ratio is 1 gram: 30-70 milliliters, adding oxygen into the closed space, and then covering the crucible with the lid after 5 to 15 seconds, closing the closed space; performing the heat treatment and the supplementary oxygen treatment Four times, with an interval of 300-600 seconds between each cycle, so as to purify the precision of the toner; to make the toner with sound-absorbing effect. A sound-absorbing toner, which is made according to the production method of the sound-absorbing toner described in claim 1, to produce the toner with a sound-absorbing effect of 5-15 decibels per cubic centimeter. A sound-absorbing composite layer, comprising the sound-absorbing carbon powder as described in claim 2, mixing the sound-absorbing carbon powder with a concrete, adding an appropriate amount of water, and waiting for the concrete with the sound-absorbing carbon powder to solidify, then forming the sound-absorbing composite layer layer. A method for making a sound-absorbing composite material, comprising: mixing a carbon powder and a glass fragment into a closed space, placing the carbon powder and the glass fragment into a crucible after mixing, and then covering it with a cover cover the crucible so that the interior of the crucible forms the closed space, and the mixing ratio of the carbon powder and the glass shards is 2:1; Apply a heat treatment to the enclosed space, apply microwaves with a power of 300-500 watts to the enclosed space for microwave heating for 5-10 minutes, so that the temperature of the enclosed space is between 800 and 1300°C; open the enclosed space The space is supplemented with oxygen, and then the cover is opened so that the outside air can enter the confined space. The ratio of the carbon powder to the air is 1 gram: 30~70 ml, so that fresh oxygen can be added into the confined space. Then cover the crucible with the lid after 5 to 15 seconds, close the closed space; perform the heat treatment and the supplemental oxygen treatment four times, with an interval of 300 to 600 seconds between each cycle, so as to purify the carbon powder and glass shards, and compound the carbon powder into the glass shards; to make a sound-absorbing composite material. A sound-absorbing composite material is made by the method for making the sound-absorbing composite material described in Claim 4, and the diameter of the sound-absorbing composite material is between 0.05 and 5 mm. A sound-absorbing composite layer, comprising the sound-absorbing composite material as described in claim 5, mixing the sound-absorbing composite material with a concrete, adding an appropriate amount of water, and waiting for the concrete with the sound-absorbing carbon powder to solidify, then forming the sound-absorbing composite layer.

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