KR100963704B1 - Soundproofing composite and method of manufacturing the same - Google Patents

Abstract

The present invention is a process for preparing a mixture by dissolving ABS resin and carbon black in a solvent; And relates to a soundproof composite material manufacturing method comprising a step of evaporating a solvent from the mixture, and to a soundproof composite material produced by the method,

According to the present invention, since the composite material is prepared by dispersing carbon black in an ABS resin, a composite material having excellent rigidity and soundproofing properties can be obtained.

Soundproof, Composite, Carbon Black

Description

Soundproof composite and method of manufacturing the same

The present invention relates to a soundproofing material, and more particularly to a soundproofing composite material.

In modern society, noise is recognized as one of industrial pollution due to technology development along with electromagnetic waves. Noise is caused by various causes, and researches on how to remove such noise are being actively conducted.

Noise removal can be achieved through high absorption efficiency and shielding efficiency depending on the frequency of the noise source. In order to obtain such high absorption efficiency and shielding efficiency, researches on the structural aspect and material aspect are conducted. have. As a result of the study on the material aspect for removing the noise, there are porous materials, fiber materials, composite materials and the like.

In addition, as a requirement of the material used for the removal of noise, in addition to the sound absorption efficiency such as high absorption efficiency and shielding efficiency, mechanical properties such as rigidity, productivity for mass production, etc. are also important.

Many studies have been conducted on composites as sound insulation materials for noise reduction, but until now, the optimal composite materials that can satisfy all requirements such as sound insulation efficiency, high rigidity characteristics, productivity for mass production, etc. Therefore, there is a need for research and development on an optimal composite material that can satisfy all of these various requirements.

The present invention was devised to meet the above-described conventional requirements, and an object of the present invention is to provide a composite material having excellent rigidity characteristics and excellent productivity for mass production, and a method of manufacturing the same.

In order to achieve the above object, the present invention is a process for preparing a mixture by dissolving ABS resin and carbon black in a solvent; And it provides a soundproof composite material manufacturing method comprising the step of evaporating the solvent from the mixture.

At this time, in the process of preparing the mixture, it is preferable that the carbon black occupies 1 to 15% by volume of the total volume of the ABS resin and carbon black.

In the step of evaporating the solvent from the mixture, it is preferable that the content of the solvent remaining in the composite material obtained through the evaporation process is 2% by weight or less based on the entire composite material.

The step of evaporating the solvent from the mixture, the step of first drying the mixture at room temperature; Heating the first dried mixture to cure the mixture; And it is preferable that the cured mixture comprises a step of secondary drying by heating at 70 to 90 ℃ for 12 to 36 hours.

The present invention also provides a sound insulation composite material comprising ABS resin and carbon black.

In this case, it is preferable that the carbon black occupies 1 to 15% by volume in the total volume of the ABS resin and the carbon black. In addition, the composite material for sound insulation may contain a solvent of 2% by weight or less based on the entire composite material.

According to the present invention of the above configuration has the following effects.

First, since the present invention uses ABS resin, the rigidity is excellent and the soundproofing property is also excellent because the composite material is prepared by dispersing carbon black in the ABS resin.

Second, the present invention, when preparing a mixture by dissolving the ABS resin and carbon black in a solvent, the desired sound insulation properties can be obtained by making the carbon black occupy 1 to 15% by volume of the total volume of the ABS resin and carbon black. In addition, it is possible to minimize the degradation of the strength characteristics due to carbon black.

Third, the present invention can prevent the strength characteristics of the obtained composite material from being lowered by setting the content of the solvent remaining in the finally obtained composite material to be 2% by weight or less based on the entire composite material.

Fourth, the present invention by performing a secondary drying process for evaporating the solvent from the mixture for 12 hours to 36 hours at 70 to 90 ℃, to prevent the decrease in productivity due to the increase in the drying process time while minimizing the degradation of the strength characteristics of the composite material can do.

Hereinafter, the present invention will be described in more detail.

1. Manufacture of composite materials

First, a mixture is prepared by dissolving ABS (Acrylonitrile Butadiene Styrene Copolymer) resin and Carbon Black in a solvent.

In order to prepare a mixture of ABS resin and carbon black, a melt blending method or a solution blending method may be used. The melt mixing method is a method of mixing the carbon black after heating the ABS resin to reach the melting point, the melt mixing method is a method of mixing the ABS resin and carbon black below the melting point using a predetermined solvent, the present invention In the present invention, acetone is used as an optimum solvent for dissolving ABS resin, and thus a dissolution mixture method that does not need to be heated to a melting point in order to prepare a mixture is used.

Acetone used as the solvent not only has a property of easily dissolving the ABS resin, but also a solvent which has a low boiling point as low as 56 ° C., thus making it easier to remove the solvent after the preparation of the mixture.

The mixture is preferably prepared by continuously adding a predetermined amount of the ABS resin and carbon black while stirring a solvent such as acetone in a stirrer, because the particles of the ABS resin and carbon black are entangled or at the stirrer wall. This is because it prevents the deadlock and shortens the dissolution time, and also improves the mechanical properties of the composite material obtained by uniformly dispersing carbon black in the ABS resin. The stirring process may be carried out at room temperature in the range of 15 to 20 ℃.

In the stirring process, an ultrasonic treatment may be further performed. In this case, the dissolution time may be shortened by increasing the solubility of the ABS resin and the carbon black, and the carbon black may be more uniformly dispersed in the ABS resin. .

The ABS resin has a large impact resistance and excellent heat resistance, it has an advantage that can be applied to a variety of automobile parts and electrical equipment parts. It is preferable to add the ABS resin so that the weight ratio of the ABS resin and the solvent is in the range of 1: 3 to 1: 5, because the viscosity of the ABS resin can be prevented during the stirring process in the above range. to be.

The carbon black serves to improve the sound insulation properties of the finally obtained composite material, it is preferable to mix so that the carbon black occupies 1 to 15% by volume in the total volume of the ABS resin and carbon black. The reason is that when the addition amount of carbon black is less than 1% by volume, the desired sound insulation property effect cannot be obtained. When the addition amount of carbon black is more than 15% by volume, the strength property of the composite material is significantly lower than that of the soundproofing property effect. to be.

Next, the solvent is evaporated from the prepared mixture.

The solvent may remain in the composite material obtained through the process of evaporating the solvent from the mixture, and it is preferable that the residual content of the solvent is 2% by weight or less based on the entire composite material. The reason is that when the amount of the remaining solvent increases, the strength characteristics of the composite material decrease.

On the other hand, in view of the strength characteristics of the composite material, the smaller the content of the solvent remaining after the evaporation step of the solvent is preferable. However, in order to reduce the content of the remaining solvent, the heating process for evaporation of the solvent has to be performed for a long time, and in this case, there is a problem that the productivity decreases during mass production. Therefore, considering both the strength characteristics of the composite material and the productivity in mass production, the solvent evaporation process can be controlled so that the content of the solvent remaining in the composite material is 0.5 to 2% by weight or less based on the entire composite material. In addition to minimizing the deterioration of the strength characteristics of the composite material to prevent productivity degradation during mass production.

The step of evaporating the solvent is a step of first drying the mixture at room temperature, heating the first dried mixture to cure the mixture, and then heating the cured mixture at 70 to 90 ° C. for second drying. Can be made.

The primary drying process may be a process of drying the mixture for 30 minutes to 2 hours at room temperature in the range of 15 to 20 ℃ using a fume hood (Fume hood).

The curing may be performed by heating the mixture to 70 to 90 ℃ using an oven to boil and evaporate a solvent such as acetone.

The secondary drying process may be performed by heating the mixture to an oven (Oven), preferably from 70 to 90 ℃ for 12 to 36 hours. This secondary drying process is a process that has a significant effect on the content of the solvent remaining in the mixture, and when the heating to more than 12 hours at a temperature of 70 to 90 ℃ to reduce the content of the solvent remaining in the composite material to less than 2%. When heated to a temperature of 70 to 90 ℃ for more than 24 hours, the content of the solvent remaining in the composite material can be reduced to less than 1%, and when heated to more than 36 hours at a temperature of 70 to 90 ℃ composite Although the content of the solvent remaining in the material can be further reduced, the amount of reduction in the content of the remaining solvent does not show a big difference compared to the case of heating for 24 to 36 hours, while the decrease in productivity is increased due to the increase in heating time. Therefore, the present invention by setting the heating time in the second drying process from 12 hours to 36 hours, while reducing the content of the solvent remaining in the composite material to less than 2% while preventing the productivity decrease due to the increase in the heating time of the composite material The strength drop can be minimized.

2. Examples and Comparative Examples

Example  One

At room temperature (20 ° C), 500 g of acetone (manufacturer: popular chemistry) was put in a round flask, and a PTFE stirrer was rotated at 400 rpm, followed by 146.8 g of ABS resin (manufacturer: LG Chem) having a density of 1.04 g / cc and a density of 1.75. 2.5 g of carbon black (manufacturer: Mitsubishi Chemical), which is g / cc, was stirred for 3 hours while being continuously supplied little by little to prepare a mixed solution.

Thereafter, the prepared mixed solution was poured into a mold having a width of 400 mm, a length of 400 mm, and a height of 5 mm, followed by primary drying at room temperature for 1 hour, followed by boiling in an oven at 80 ° C. for 1 hour to cure the mixture.

Thereafter, the cured mixture was cut into 5 mm long and 5 mm long, and then dried in an oven at 80 ° C. for 36 hours to obtain a composite material.

Example  2

In Example 1 described above, a composite material was obtained in the same manner as in Example 1, except that 144.1 g of ABS resin and 7.5 g of carbon black were used.

Example  3

In Example 1 described above, a composite material was obtained in the same manner as in Example 1, except that 140.1 g of ABS resin, 12.5 g of carbon black, and 510 g of acetone were used.

Example  4

In Example 1 described above, a composite material was obtained in the same manner as in Example 1, except that 42.1 g of ABS resin, 12.5 g of carbon black, and 180 g of acetone were used.

Example  5

In Example 1 described above, a composite material was obtained in the same manner as in Example 1, except that 29.7 g of ABS resin, 12.5 g of carbon black, and 140 g of acetone were used.

Example  6

In Example 1 described above, a composite material was obtained in the same manner as in Example 1, except that 58.3 g of ABS resin, 0.5 g of carbon black, and 195 g of acetone were used.

Example  7

In Example 1 described above, a composite material was obtained by the same method as Example 1, except that secondary drying was performed for 24 hours in an oven at 80 ° C.

Example  8

In Example 1 described above, a composite material was obtained by the same method as Example 1, except that secondary drying was performed for 12 hours in an oven at 80 ° C.

Example  9

In Example 1 described above, a composite material was obtained by the same method as Example 1, except that secondary drying was performed for 1 hour in an oven at 80 ° C.

The important process conditions for the above Examples 1 to 9 are summarized in Table 1 below.

TABLE 1

division ABS addition amount Carbon black addition amount Acetone
Addition amount Carbon black
Volume ratio Secondary
Drying time Weight (g) Volume (cc) Weight (g) Volume (cc) weight
(g) Volume ratio (%) time
(hrs) Example 1 146.8 141.2 2.5 1.4 500.0 1.0 36 Example 2 144.1 138.6 7.5 4.3 500.0 3.0 36 Example 3 140.1 134.7 12.5 7.1 510.0 5.0 36 Example 4 42.1 40.5 12.5 7.1 180.0 15.0 36 Example 5 29.7 28.6 12.5 7.1 140.0 20.0 36 Example 6 58.3 56.1 0.5 0.3 195.0 0.5 36 Example 7 146.8 141.2 2.5 1.4 500.0 1.0 24 Example 8 146.8 141.2 2.5 1.4 500.0 1.0 12 Example 9 146.8 141.2 2.5 1.4 500.0 1.0 One

<Note>

1. The density of ABS is 1.04 g / cc and the density of carbon black is 1.75 g / cc.

2. The volume ratio of carbon black is the volume ratio of carbon black to the total volume of ABS resin and carbon black.

Comparative example

ABS resin was prepared as a comparative example.

3. Experimental Example

(1) Sound insulation characteristic measurement

Samples having an outer diameter of 29.25 mm and a thickness of 3.0 mm were prepared using the injection molding process of the composite material according to Examples 1 to 3 and the ABS resin according to the Comparative Example.

For the prepared samples, the soundproof characteristics were measured using the soundproof measuring apparatus according to FIG. 1. Soundproof measurement apparatus according to Figure 1 shows the transmission loss (transmission loss) in decibels (dB) unit through the amount of energy incident from the noise source, the measurement frequency is up to 6.4KHz. Using the soundproof measuring apparatus according to Figure 1 was measured three times for each sample, and the measured value is shown as an average, the results are shown in FIG.

As can be seen in Figure 2, compared with the case of the comparative example consisting of only ABS resin, the embodiment made of a composite material of ABS resin and carbon black can be seen that the transmission loss is greater, and therefore, the case of the embodiment than the case of the comparative example It can be seen that the sound insulation effect is excellent. In addition, it can be seen that Example 2 has a better soundproofing effect than Example 1, and Example 3 has a better soundproofing effect than Example 2, and accordingly, as the content of carbon black increases, the soundproofing effect is increased. .

(2) tensile measurement 1

Samples were prepared using an injection molding process for the composite material according to Examples 1 to 6 and the ABS resin according to the Comparative Example.

For each sample, the elastic modulus (MPa) and the maximum tensile strength (MPa) were measured according to ASTM D638 test method, and the measured values are shown in Table 2 below.

TABLE 2

division  Modulus of elasticity (MPa) Tensile Strength (MPa) Example 1 1244 59.3 Example 2 1312 56.3 Example 3 1395 52.6 Example 4 1752 41.7 Example 5 2056 27.2 Example 6 1235 60.1 Comparative example 1227 62.3

As can be seen in Table 2, compared to the case of the comparative example made of only the ABS resin produced in the same process, it can be seen that the embodiment made of a composite material of ABS resin and carbon black has a low tensile strength value is low. In addition, as can be seen from the results of Examples 1 to 6, it can be seen that as the content of the carbon black increases, the rigidity increases and the strength decreases.

(3) Acetone residual amount measurement

3 is a graph showing a change in the amount of acetone remaining as the secondary drying time is changed.

As can be seen in Figure 3, when the secondary drying time is 1 hour as in Example 9, the amount of acetone remaining is about 5%, as shown in Example 8 of the remaining acetone when the secondary drying time is 12 hours If the content is less than 2%, the secondary drying time is 24 hours as in Example 7 and the secondary drying time is 36 hours as in Example 1 it can be seen that the amount of acetone remaining is less than 1% have.

(4) tensile measurement 2

Samples were prepared using the injection molding process for the composite materials according to Example 1 and Examples 7 to 9.

For each sample, the elastic modulus (MPa) and the maximum tensile strength (MPa) were measured according to ASTM D638 test method, and the measured values are shown in Table 3 below.

TABLE 3

division  Modulus of elasticity (MPa) Tensile Strength (MPa) Example 1 1244 59.3 Example 7 1248 59.0 Example 8 1256 58.5 Example 9 1266 57.9

As can be seen from Table 3, it can be seen that as the content of the remaining acetone increases, the strength decreases because the tensile strength value decreases. Also, as in Examples 1, 7, and 8, when the amount of acetone remaining is 2% or less, the change in elastic modulus and tensile strength was not large. However, as in Example 9, it can be seen that when the content of the remaining acetone is greater than 2% (about 5%), the reduction rate of the tensile strength value increases.

1 is a schematic diagram schematically showing a sound insulation measuring apparatus according to the present invention.

FIG. 2 is a graph illustrating soundproofing measurement results for respective samples using the soundproofing apparatus according to FIG. 1.

3 is a graph showing a change in the amount of acetone remaining as the secondary drying time is changed.

Claims (9)

Dissolving ABS resin and carbon black in an acetone solvent to prepare a mixture; And And evaporating the acetone solvent from the mixture, The step of evaporating the acetone solvent from the mixture, First drying the mixture at room temperature; Heating the first dried mixture to cure the mixture; And Soundproof composite material manufacturing method comprising the step of drying the cured mixture at 70 to 90 ℃ for 12 hours to 36 hours. The method of claim 1, In the process for producing the mixture, the soundproof composite material manufacturing method characterized in that the carbon black occupies 1 to 15% by volume of the total volume of the ABS resin and carbon black. The method of claim 1, In the process of preparing the mixture, the weight ratio of the ABS resin and acetone solvent is 1: 3 to 1: 5 characterized in that the manufacturing method of the composite material for soundproof. The method of claim 1, The process of preparing the mixture, A method of producing a composite material for sound insulation, characterized in that the step of continuously adding the ABS resin and carbon black by a predetermined amount while stirring the acetone solvent. The method of claim 1, The step of evaporating the acetone solvent from the mixture, A method of producing a sound-absorbing composite material, characterized in that the content of acetone solvent remaining in the composite material obtained through the evaporation process is 2% by weight or less based on the entire composite material. delete It is made of ABS resin and carbon black, Soundproof composite material, characterized in that the carbon black occupies 1 to 15% by volume of the total volume of the ABS resin and the carbon black, the solvent contains less than 2% by weight of the total composite material. delete delete

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