WO2020009367A1 - Method for manufacturing stiffness-enhanced product using carbon nanotubes and stiffness-enhanced product manufactured thereby - Google Patents

Abstract

The present invention relates to a method for manufacturing a stiffness-enhanced product using carbon nanotubes and a stiffness-enhanced product manufactured thereby. The method for manufacturing a stiffness-enhanced product using carbon nanotubes according to the present invention comprises the steps of: mixing a carbon nanotube powder with a dispersion solvent; subjecting the mixture solution to microwave treatment to disperse the carbon nanotube powder; introducing the mixture solution, in which the carbon nanotubes powder has been dispersed, to mulberry leaves; picking and separating the mulberry leaves to which the mixture solution has been introduced, and then drying the mulberry leaves; obtaining cocoon by using the dried mulberry leaves as a feed for silkworm; and manufacturing a yarn by using the cocoon. By introducing carbon nanotubes and water to a plant and using the plant to produce the product through the above feature, the present invention can produce a product with enhanced stiffness and other properties.

Description

Manufacturing method of rigid reinforced products using carbon nanotubes and rigid reinforced products manufactured thereby

The present invention relates to a method for producing a rigid reinforced product using carbon nanotubes and to a rigid reinforced product produced by the present invention, and more particularly, by supplying carbon nanotubes and water to plants and producing products using the plants. The present invention relates to a method for producing a rigid reinforced product using carbon nanotubes capable of producing a product having enhanced rigidity and other physical properties, and a rigid reinforced product manufactured thereby.

Carbon nanotubes are nanomaterials with excellent mechanical strength, and the tensile strength of one strand is up to 150 GPa.

On the other hand, the tensile strength of the carbon nanotube fibers is very weak compared to the carbon nanotubes, and is generally 2 GPa or less.

Carbon nanotube fibers are composed of numerous carbon nanotubes, but they are connected between the walls and the walls of carbon nanotubes by van der Waals forces, weak molecular bonds.

Thus, physical and chemical methods have been attempted to increase the strength of carbon nanotube fibers.

Physical methods include shrinking the carbon nanotube fibers by spraying a solvent on the carbon nanotube fibers or dipping the carbon nanotube fibers in a solvent. Through this, as the distance between the carbon nanotubes is narrowed to increase the van der Waals force, the strength of the carbon nanotube fibers can be increased.

However, since van der Waals forces are basically weaker bonds than covalent bonds, there is a limit to increasing the strength of carbon nanotube fibers through the physical method as described above.

On the other hand, as a chemical method, a method of filling the space between the carbon nanotubes constituting the carbon nanotube fibers using a polymer, or connecting by covalent bonds stronger than van der Waals forces through crosslinking between the carbon nanotubes have.

As a chemical chuck treatment method for carbon nanotube fibers, it is common to immerse the fibers in a reaction solution and then perform a chemical reaction.

In this case, it is difficult for the reactant to diffuse into the center of the carbon nanotube fibers, and the reaction hardly occurs at the center of the carbon nanotube fibers. Accordingly, there is a limit that does not properly obtain the effect of the chemical reaction, and does not significantly increase the mechanical strength of the carbon nanotube fibers.

The present invention provides a method for producing a rigid reinforced product using carbon nanotubes and carbon nanotubes that can supply carbon nanotubes and water to plants and produce products using the plants, thereby producing products with enhanced rigidity and other physical properties. To provide rigid reinforced products.

Various problems to be solved by the present invention are not limited to the above-mentioned problems, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

Method for producing a rigid reinforced product using carbon nanotubes according to the present invention is to mix the carbon nanotube powder in a dispersing solvent, to disperse the carbon nanotube powder by microwave treatment to the mixed solution, the carbon nanotube powder is dispersed The mixed solution was supplied to the mulberry leaves, and after separating the mulberry leaves supplied with the mixed solution, and dried the mulberry leaves, using the dried mulberry leaves as food for silkworms to obtain a silkworm cocoon, the silkworm Manufacturing the yarn using cocoons.

It is mixed at a weight ratio of 10,000 to 20,000 parts by weight of water with respect to 1 part by weight of the carbon nanotube powder, the microwave treatment is maintained at a temperature of 15 to 20 ℃ after the mixed solution 5 to 5 to a rotational speed of 20,000 to 25,000 rpm It proceeds by irradiating a microwave of 800 to 1000W for 10 minutes, the drying of the mulberry leaves may be dried for 3 to 6 hours in a dryer maintained at a temperature of 20 to 25 ℃ and humidity 35 to 45%.

In addition, the present invention includes a rigid reinforced product using carbon nanotubes prepared by the above-described manufacturing method.

Specific details of other embodiments are included in the detailed description.

The method for producing a rigid reinforced product using carbon nanotubes according to the present invention can supply a carbon nanotube and water to a plant, and produce a product using the plant to produce a product having enhanced rigidity and other physical properties.

It will be fully understood that embodiments of the inventive concept may provide various effects that are not specifically mentioned.

1 is a view schematically showing an apparatus for manufacturing a solvent in which carbon nanotubes are dispersed according to another embodiment of the inventive concept.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the present invention to those skilled in the art.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the method for producing a rigid reinforced product using carbon nanotubes according to the present invention.

According to an embodiment of the present invention, a method of manufacturing a rigid reinforced product using carbon nanotubes is provided by supplying carbon nanotubes and water to a plant and producing a product using the plant, thereby improving rigidity and other physical properties. Produce a product.

First, in order to manufacture a rigid reinforced product using carbon nanotubes according to the present invention, carbon nanotubes may be mixed with a dispersion solvent.

The carbon nanotube (CNT) is a carbon allotrope made of carbon present in a large amount, and one carbon is combined with another carbon atom and a hexagonal honeycomb pattern to form a tube, and the diameter of the tube is nanometers ( is known to be a very small region of matter).

Carbon nanotubes are single-walled carbon nanotubes (SWCNTs) and single-walled carbon nanotubes (SWCNT) in which a single layer of graphite is rolled up and connected to one another according to synthetic conditions. (double walled carbon nanotube, DWCNT), thin multiwalled carbon nanotube (t-MWCNT) consisting of three to six single-walled walls, thin multiwalled carbon nanotube (MWCNT) Classified as

Carbon nanotubes are physically robust (eg, about 100 times stronger than steel), have excellent chemical stability, high thermal conductivity, excellent mechanical properties, electrical selectivity, excellent field emission characteristics, high efficiency hydrogen storage media, etc. It is known as a perfect new material with few defects in existing materials.

In the present invention, the carbon nanotubes may be carbon nanotube powder (powder), and the dispersion solvent may be used to disperse the carbon nanotube powder and supply it to plants, and water may be used as the dispersion solvent. .

In addition, in the present invention, it is possible to prepare a mixed solution by mixing in a weight ratio of 10,000 to 20,000 parts by weight of water with respect to 1 part by weight of the carbon nanotube powder.

Next, the mixed solution can be dispersed by microwave treatment.

The microwave treatment may be applied to further promote the dispersion of carbon nanotube powder in the mixed solution. The microwave treatment may be performed at a rotational speed of 20,000 to 25,000 rpm after maintaining the mixed solution at a temperature of 15 to 20 ° C. It can proceed by irradiating a microwave of 800-1000W for 5-10 minutes.

Next, the mixed solution in which the carbon nanotube powder is dispersed may be supplied to the plant.

The plant to which the mixed solution in which the carbon nanotube powder is dispersed may be supplied as a mulberry. For example, the mulberry may be sprayed on the leaves of the mulberry by spraying the mixed solution in which the carbon nanotube powder is dispersed for 5 to 20 days. It is possible to supply a mixed solution of carbon nanotube powder dispersed in the leaves.

Subsequently, after separating the mulberry leaves supplied with the mixed solution, the mulberry leaves may be dried.

Drying of the mulberry leaves may be carried out in a dryer in which a constant temperature and humidity are maintained in order to prevent chlorophyll of the mulberry leaves from being destroyed and the fragrance of the mulberry leaves disappears, for example, drying of the mulberry leaves Drying may be carried out for 3 to 6 hours in a dryer maintained at a temperature of 20-25 ° C. and a humidity of 35-45%.

Next, the cocoon can be obtained by using the dried mulberry leaves as food for silkworms.

The method for obtaining silkworm cocoon using the dried mulberry leaves as the food for the silkworm is a well-known technique, and a detailed description thereof will be omitted for clarity and convenience of the present invention.

Next, the silkworm cocoon can be used to manufacture a known product such as a yarn (silk thread) or a fiber (cloth).

The method for manufacturing a known product such as yarn or fiber (cloth) using the cocoon is a well-known technique, for the sake of clarity and convenience of the present invention, a detailed description thereof will be omitted.

On the other hand, in one embodiment of the technical idea of the present invention has been described with an example of spraying the mixed solution in which the carbon nanotube powder is dispersed on the mulberry leaf, the technical idea of the present invention is not limited to the mulberry leaf. In addition, it can be applied to various plants that can be commercialized, and can also supply a mixed solution in which carbon nanotube powder is dispersed by spraying not only the leaves of the plant but also stems, roots, and shells.

In addition, the technical idea of the present invention is to inject (inject) the mixed solution in which the carbon nanotube powder is dispersed by using injection or the like, in addition to spraying and supplying the mixed solution in which the carbon nanotube powder is dispersed. It is also possible to supply a mixed solution in which the tube powder is dispersed.

In addition, the technical idea of the present invention to improve the rigidity of the product manufactured using the plant by supplying a mixed solution in which carbon nanotube powder is dispersed not only the leaves of the plant, but also stems, roots, shells, etc. as described above. You can.

On the other hand, in one embodiment of the technical idea of the present invention, in order to manufacture a rigid reinforced product using the carbon nanotubes, carbon nanotubes are mixed in a dispersing solvent, and the carbon nanotube powder dispersed solution is supplied to the plant As described as an example, a solvent in which carbon nanotubes are dispersed according to another embodiment of the inventive concept may be prepared using electrolysis as follows.

1 is a view schematically showing an apparatus for manufacturing a solvent in which carbon nanotubes are dispersed according to another embodiment of the inventive concept.

Referring to FIG. 1, in order to manufacture a solvent in which carbon nanotubes are dispersed according to another embodiment of the inventive concept, a 1.5 V battery using a silver rod and a platinum rod may be used as a solution in which nano carbon and water are diluted. By electrolyzing into a solvent in which carbon nanotubes are dispersed, and spraying and supplying the same to plants, a rigid reinforced product using carbon nanotubes may be manufactured.

Hereinafter, an embodiment of a method for producing a rigid reinforced product using carbon nanotubes according to the present invention will be described in more detail.

<Example>

As described above, a polyethylene terephthalate multifilament yarn was prepared using a cocoon prepared using carbon nanotubes.

First, the cocoon yarn prepared using a spinning oil and carbon nanotubes is mixed with a polyethylene terephthalate chip, and then 1250 denier / 125 filament yarn under spinning conditions in which strength of 93 gf / denier is expressed through a process such as spinning and drawing. Was prepared.

At this time, the amount of the spinning emulsion adhered to the fiber is 0.60wt% level and produced in order to avoid excessive wetting in the spinning process, the roller 4 No. 4 temperature is 210 ℃.

In addition, the polyethylene terephthalate chip and cocoon yarn was to be included in the weight ratio of 100 parts by weight of polyethylene terephthalate chip and 10 parts by weight of cocoon yarn.

<Comparative Example>

Polyethylene terephthalate multifilament yarn was prepared in the same manner as in Example, in the comparative example was prepared a polyethylene terephthalate multifilament yarn without including a cocoon yarn prepared using carbon nanotubes.

The physical property evaluation of an Example and a comparative example was measured or evaluated as follows.

1. Intrinsic Viscosity (IV)

After dissolving 0.1 g of the sample in a reagent (90 ° C.) mixed with phenol and 1,1,2,3-tetrachloroethanol at a weight ratio of 6: 4 for 90 minutes to have a concentration of 04 g / 100 ml, a Ubbelohde viscometer The remaining number of drops of the solution was determined using a viscometer and an aspirator. The number of drops of the solvent was also determined in the same manner, and then the RV and IV values were calculated by the following equation. Calculated.

RV = number of drops of sample / number of drops of solvent

IV = 1/4 × (RV-1) / C + 34 × (InRV / C)

Where C represents the concentration of the sample in solution (g / 100ml).

2. How to measure the elongation of yarn

The yarn is left for 24 hours in a constant temperature and humidity room under standard conditions, that is, 25 ° C. and 65% RH relative humidity, and the sample is measured by a tensile tester using the ASTM 2256 method.

3. Measurement of strong retention rate after heat treatment of yarn

While maintaining the temperature of the test light equipment at 240 ℃, heat-treat for 3 minutes by applying 0067gf / denier load to the 50cm length yarn. For 1300 denier yarn, hang the weight of 871g by hanging the weight.

The heat-treated yarn sample was placed in a standard condition (25 ° C., 65% RH) for 1 hour and then heat-treated 5 times per sample by the method of measuring the elongation of the yarn to obtain a result, and then an average value of 5 values was used.

4. Measurement of heating loss rate of spinning oil

The spinneret is treated for 5 hours in a 105 ° C oven to remove moisture or solvent components in the spinneret.

The process of heating loss is evaluated by measuring the weight change up to 298 ° C. while heating the spinning oil with TGA (PerkinElmer, model name Pyris 1 TGA) equipment at a temperature of 10 minutes per minute while purging nitrogen gas.

division Example Comparative example % Of heating loss up to 298 ℃ of applied spinning oil 3.1 17.5 Yarn Strength (gf / denier) 9.42 9.25 Yarn Strength (kgf) 12.21 12.05 Yarn strength after heat treatment at 240 ℃ (kgf) 10.25 9.75 Strong retention of yarn after heat treatment at 240 ℃ (%) 84.3 80.9

Referring to [Table 1], the yarn according to the embodiment has a higher rigidity retention than the yarn according to the comparative example, it was possible to produce a high rigid polyethylene terephthalate multifilament yarn.

Although one preferred embodiment of the present invention has been described above, those skilled in the art to which the present invention pertains understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. Could be. Therefore, it should be understood that one embodiment described above is illustrative in all respects and not restrictive.

Claims (2)

Carbon nanotube powder is mixed with a dispersion solvent to prepare a mixed solution, Microwave treatment to disperse the carbon nanotube powder in the mixed solution, Supplying the mixed solution of the carbon nanotube powder dispersed in the mulberry leaves, After separating the mulberry leaves supplied with the mixed solution, and drying the mulberry leaves, Using the dried mulberry leaves as a food for silkworms to obtain a cocoon, Including the process of manufacturing a yarn using the cocoon, The mixed solution is mixed in a weight ratio of 10,000 to 20,000 parts by weight of water based on 1 part by weight of the carbon nanotube powder, The microwave treatment proceeds by maintaining the mixed solution at a temperature of 15 to 20 ° C. and then irradiating 800 to 1000 W of microwave for 5 to 10 minutes at a rotational speed of 20,000 to 25,000 rpm, The mixed solution in which the carbon nanotube powder is dispersed is supplied by spraying the mulberry leaves for 5 to 20 days, Drying of the mulberry leaves is a method of producing a rigid reinforced product using carbon nanotubes, characterized in that the drying for 3 to 6 hours in a dryer maintained at a temperature of 20 to 25 ℃ and a humidity of 35 to 45%. Rigidity reinforced product using carbon nanotubes, characterized in that produced by the method of claim 1.

Images