KR101481579B1 - Anti Bacteria Plastic Pellet Comprising Bamboo Charcoal and Method Thereof - Google Patents

Abstract

The present invention relates to an antibacterial plastic pellet containing bamboo charcoal and a method for producing the same, and more particularly, to an antimicrobial plastic pellet containing bamboo charcoal containing silver stannous bamboo charcoal bearing silver nitrate or silver chloride and bamboo charcoal containing polypropylene Pellets and a process for producing the same.
According to the present invention, silver nitrate or silver chloride can be adhered to the pores of bamboo charcoal to improve the mixing property with the synthetic resin, and sterilization power of silver can be added to the produced pellets. Therefore, the antibacterial plastic pellets containing bamboo charcoal can be added to sterilize germs and fungi generated from the surface or contents of plastic products formed, and the volatile organic compounds generated from the plastic products due to the deodorizing function of bamboo charcoal It can protect the user from formaldehyde.

Description

TECHNICAL FIELD [0001] The present invention relates to an antibacterial plastic pellet containing bamboo charcoal,

The present invention relates to an antibacterial plastic pellet containing bamboo charcoal and a method for producing the same, which can sufficiently exhibit antibacterial, sterilizing and deodorizing functions of bamboo charcoal by improving the mixing property between bamboo charcoal and synthetic resin.

Because plastic products are light and hard and easy to mold, injection molding synthetic resins are widely used in office automation equipment such as computers, information communication devices, automobile interior and exterior materials, household electric appliances, household goods, machinery, apparatuses and large-sized molded products. However, such synthetic resin molded articles have been pointed out as not only releasing volatile organic compounds and formaldehyde, but also having poor odor and hygiene.

On the other hand, Korea has traditionally used charcoal to improve its health and residential environment. In particular, bamboo charcoal is a porous carbonaceous adsorbent composed of amorphous hydrocarbons and amorphous hydrocarbons, usually of crystalline polycyclic aromatic molecules, which are not only large pores that can be observed by optical microscopy but also very small pores of similar size to adsorbed molecules Pore structure. In addition, it exhibits excellent adsorption characteristics in gas phase and liquid phase. These bamboo charcoal is more developed than ordinary charcoal, and has excellent anion emission, far infrared ray emission, antibacterial effect, adsorption effect.

Accordingly, various patents have been proposed in order to apply such charcoal to plastic products to add antibacterial, sterilizing, and deodorizing performance.

For example, Korean Patent Registration No. 10-0367770 discloses that 97.7-99.2 parts by weight of a plastic raw material (at least one of polypropylene, polyethylene, polyvinyl chloride, and polystyrene), 0.5-1.5 parts by weight of bamboo charcoal powder, 0.3-0.8 Discloses a plastic container in which bamboo charcoal is injected by adding weight parts.

Open No. 10-2000-0012409 discloses a plastic container in which 0.5-1.5 parts by weight of bamboo charcoal powder and 0.3-0.8 parts by weight of titanium oxide are added to 100 parts by weight of a plastic raw material and injection molded. However, since the content of bamboo charcoal powder is only 0.5 to 1.5 parts by weight, it is difficult to expect a beneficial effect of charcoal.

However, in order for the bamboo charcoal to exhibit its usefulness, its content should be not less than 5% by weight in the whole composition, but it is very difficult to uniformly disperse and mix the charcoal and the plastic such as polypropylene.

Therefore, it is required to develop a new technology that can improve the mixing property of bamboo charcoal and synthetic resin and add the functionality of bamboo charcoal to synthetic resin.

Korean Patent Registration No. 10-0367770 Korean Patent Publication No. 10-2000-0012409

An object of the present invention is to provide an antibacterial plastic pellet containing bamboo charcoal excellent in antibacterial, deodorization and far-infrared ray releasing functions and a method for producing the same.

To achieve the above object, the present invention provides a bamboo charcoal comprising silver-impregnated bamboo charcoal bearing silver nitrate or silver chloride on bamboo charcoal, and synthetic resin,
The synthetic resin may be selected from the group consisting of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyamide, polyacrylate resin, acrylonitrile butadiene styrene resin, acrylonitrile ethylene resin, polymethyl methacrylate, polyacetal, A vinylidene resin, a polycarbonate, and a mixture thereof.
Wherein the silver-impregnated bamboo charcoal and the synthetic resin are contained in a weight ratio of 1: 4 to 5, and the antibacterial plastic pellets contain bamboo charcoal.

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The present invention also provides a method for producing silver-impregnated bamboo charcoal, comprising the steps of: preparing silver-impregnated bamboo charcoal by supporting silver nitrate or silver chloride on bamboo charcoal;
Bamboo charcoal is added to silver nitrate or silver chloride solution (5 ~ 15 g / L) to obtain impregnated bamboo charcoal and stirred for several hours for silver impregnation, followed by filtering, washing with water, and drying to obtain silver-impregnated bamboo charcoal; And
Mixing the silver-added bamboo charcoal with the synthetic resin, and then extruding the mixture,
The synthetic resin may be selected from the group consisting of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyamide, polyacrylate resin, acrylonitrile butadiene styrene resin, acrylonitrile ethylene resin, polymethyl methacrylate, polyacetal, A vinylidene resin, a polycarbonate, and a mixture thereof.
Wherein the silver impregnated bamboo charcoal and the synthetic resin are contained in a weight ratio of 1: 4 to 5.

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Also,

And a resin molded product containing bamboo charcoal produced by injection molding the antibacterial plastic pellet as a raw material.

According to the present invention, silver nitrate or silver chloride can be adhered to the pores of bamboo charcoal to improve the mixing property with the synthetic resin, and sterilization power of silver can be added to the produced pellets. Therefore, the antibacterial plastic pellets containing bamboo charcoal can be added to sterilize germs and fungi generated from the surface or contents of plastic products formed, and the volatile organic compounds generated from the plastic products due to the deodorizing function of bamboo charcoal It can protect the user from formaldehyde.

Fig. 1 (a) is an SEM photograph of bamboo charcoal in which silver nitrate is not impregnated, and b) is bamboo charcoal in which silver nitrate is impregnated.
2 (a) is a SEM photograph of bamboo charcoal in which silver chloride is not impregnated, and b) is a SEM photograph of bamboo charcoal in which silver chloride is impregnated.
3 shows the results of the physical properties test of Example 1 according to the present invention.
4 shows results of antibacterial experiments of Example 1 according to the present invention.

The antimicrobial plastic pellet according to the present invention includes silver-impregnated bamboo charcoal bearing silver nitrate or silver chloride on bamboo charcoal, and synthetic resin.

Charcoal is a hydrophilic material with irregular surface and complex porous structure. Charcoal powder is a light material with bulk density of around 0.3, whereas synthetic resin such as polypropylene has a specific gravity of about 1.0 and has a large specific gravity. Since they are hydrophobic substances having a high viscosity, their mixing properties are very poor and it is difficult to uniformly disperse and mix them.

Also, when a container is formed from a synthetic resin whose charcoal powder is not uniformly dispersed, charcoal powder is exposed on the surface of the container and the fluidity of the molten resin is lowered during molding, which is a cause of defective molding. Since the inside of the char is porous, the air is released from the pores of the char as the temperature is raised in the process of mixing with the synthetic resin. As the size of the char powder increases, the amount of air is also increased and the pin hole and tear And the compatibility with the synthetic resin is lowered.

 Accordingly, in the present invention, silver nitrate or silver chloride is adhered to the pores of bamboo char to remove air present in the pores of the char to improve the compatibility with the synthetic resin. In addition, the sterilization effect is obtained through impregnation.

The synthetic resin can be appropriately selected from general-purpose synthetic resins according to molding conditions and physical properties required for a molded article. The synthetic resin is, for example, a synthetic resin such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyamide, polyacrylate resin, acrylonitrile butadiene styrene resin, acrylonitrile ethylene resin, polymethyl methacrylate, , A vinyl acetate resin, a vinylidene chloride resin, a polycarbonate, and a mixture thereof. However, the present invention is not limited thereto.

At this time, the impregnated bamboo charcoal and the synthetic resin are preferably contained in a weight ratio of 1: 4 to 5. The higher the content of silver-impregnated bamboo charcoal in the antimicrobial plastic pellets, the more excellent antimicrobial and deodorizing function can be exhibited. However, if the content exceeds the above-mentioned weight ratio, the production of pellets uniformly mixed by the difference in specific gravity between bamboo charcoal and synthetic resin it's difficult. Therefore, it is preferable that the content of silver-added bamboo charcoal is suitably added within the above-mentioned range in terms of mixing with synthetic resin and demonstrating its effectiveness.

It is also preferable to use bamboo charcoal having a diameter of 10 to 20 mu m. If the particle size is larger than the above range, the amount of air released from charcoal is increased, resulting in deterioration of the compatibility with the synthetic resin and deterioration of fluidity, which may cause defective products in the extrusion process.

In the antibacterial plastic pellet of the present invention,

Silver nitrate or silver chloride on bamboo charcoal to produce silver-impregnated bamboo charcoal,

The prepared silver is prepared by mixing impregnated bamboo char and synthetic resin and then extruding.

First, silver nitrate or silver chloride is deposited on bamboo charcoal to produce silver impregnated bamboo charcoal.

To obtain the adhered bamboo charcoal, bamboo charcoal is added to silver nitrate or silver chloride solution (5 ~ 15 g / L) and stirred for several hours for silver impregnation. After stirring, it is washed with water, dried, and then silver-impregnated bamboo charcoal is obtained.

Next, the prepared silver-impregnated bamboo charcoal and synthetic resin are mixed and extruded.

The melting extrusion temperature of the mixture of the silver-impregnated bamboo charcoal and the synthetic resin may be appropriately selected according to the kind of the synthetic resin used and the amount of the bamboo charcoal mixed in the range of 100 to 350 ° C.

It will also be apparent to those skilled in the art that minor amounts of pigments, plasticizers, release agents, and ultraviolet stabilizers can be added to the blend for effective extrusion and pellet formation to improve processability and physical properties.

After the melt-extrusion, a cutting process is performed to process pellets to facilitate storage and transportation.

As such, the antimicrobial plastic pellets can be used as raw materials for injection molding commonly used in the production of plastic products. For example, the antimicrobial plastic pellets are used as a raw material for the production of automobile interior and exterior materials, and have antimicrobial and germicidal action against microorganisms which are distributed in automobiles and are able to transmit contact through human beings. From the volatile organic compounds and formaldehyde Lt; / RTI >

Hereinafter, preferred embodiments of the present invention will be described. The following examples are provided for the purpose of more clearly illustrating the present invention and the present invention is not limited to the following examples.

Example 1

3 kg of 20 탆 bamboo activated carbon was added to 2 L of heavy water in which 30 g of silver nitrate was melted and stirred well for 1 hour. Silver impregnated charcoal and water were separated, washed with acetone, and dried to obtain 2.7 kg of silver nitrate supported bamboo activated carbon.

Fig. 1 (a) is an SEM photograph of bamboo charcoal in which silver nitrate is not impregnated, and b) is bamboo charcoal in which silver nitrate is impregnated.

604 g of silver supported bamboo activated carbon thus obtained and 25000 g of polypropylene pellets were extruded at 210 ° C. through an extruder (bamboo activated carbon and polypropylene volume ratio, 100: 3 by volume), cooled, and then cut into pellets to prepare an antimicrobial plastic .

Example 2

3 kg of 20 탆 bamboo activated carbon was added to 6 L ammonia water in which 30 g of silver chloride had been melted and stirred for 1 hour. Silver separates the impregnated charcoal and water and uses acetone

2 (a) is a SEM photograph of bamboo charcoal in which silver nitrate is not impregnated, and b) is a SEM photograph of bamboo charcoal in which silver nitrate is impregnated.

604 g of silver supported bamboo activated carbon thus obtained and 25000 g of polypropylene pellets were extruded at 210 ° C. through an extruder (bamboo activated carbon and polypropylene volume ratio, 100: 3 by volume), cooled, and then cut into pellets to prepare an antimicrobial plastic .

Experimental Example 1: Property Test

The properties of the antimicrobial plastic pellets and the polypropylene pellets of Example 1 were tested and the results are shown in Table 1 and FIG.

Test Items
Test unit Test Methods Polypropylene pellets Example 1 Melt Index
g / 10 min ASTM D 1238 25 27 importance
- ASTM D 0.977 0.979 The tensile strength
MPa ASTM D 23.2 23.3 Elongation
% ASTM D 30 39 Flexural strength
MPa ASTM D 30.2 37.4 Flexural modulus
GPa ASTM D 1.54 1.77 IZOD impact strength
J / m
ASTM D 49 56 -10 ° C ASTM D 35 39 Rockwell hardness - ASTM D 87 87 Load deformation temperature ℃ ASTM D 121 118

As shown in Table 1, the addition of charcoal and silver nitrate improved the physical properties in terms of melt index, elongation, flexural strength, and IZOD strength, and did not change much in the other properties. Even when charcoal and silver nitrate were added to the material, It is possible to obtain the result that the physical properties are reinforced.

Experimental Example 2: Antibacterial test

The antibacterial plastic pellets and the polypropylene pellets of Example 1 were subjected to an antibacterial test. The results are shown in Table 2 and FIG. 4 below.

Test Items Sample classification Test Methods Polypropylene
Pellets Example 1 Antibacterial test
(E. coli)


Ma


KS J 4206: 2008




3.4 x 10 < ³ > CFU / mL 3.4 x 10 < ³ > CFU / mL Mb 1.9 × 10 ⁵ CFU / mL 1.9 × 10 ⁵ CFU / mL Mc 2.9 × 10 ³ CFU / mL 2.2 x 10 < ³ > CFU / mL R 98.5% 98.9% Antibacterial test
(S. aureus)


Ma 2.1 x 10 < ³ > CFU / mL 2.1 x 10 < ³ > CFU / mL Mb 8.1 x 10 ⁴ CFU / mL 8.1 x 10 ⁴ CFU / mL Mc 4.0 x 10 < ³ > CFU / mL 1.1 x 10 < ³ > CFU / mL R 95.1% 98.7%

As shown in Table 2, the antimicrobial activity against E. coli increased from 98.5% to 98.9%, and the antimicrobial activity against S. staphylococci increased from 95.1% to 98.7%, indicating that antibacterial activity due to the addition of charcoal and silver nitrate to the polypropylene material And improved results were obtained.

Claims (7)

Silver bamboo charcoal bearing silver nitrate or silver chloride on bamboo charcoal, and synthetic resin,
The synthetic resin may be selected from the group consisting of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyamide, polyacrylate resin, acrylonitrile butadiene styrene resin, acrylonitrile ethylene resin, polymethyl methacrylate, polyacetal, A vinylidene resin, a polycarbonate, and a mixture thereof.
Wherein the silver-impregnated bamboo charcoal and the synthetic resin are contained in a weight ratio of 1: 4 to 5, and the antibacterial plastic pellets contain bamboo charcoal. delete delete The antimicrobial plastic pellet according to claim 1, wherein the size of the silver impregnated bamboo char is 10 to 20 탆. Silver nitrate or silver chloride on bamboo charcoal to produce silver-impregnated bamboo charcoal;
Bamboo charcoal is added to silver nitrate or silver chloride solution (5 ~ 15 g / L) to obtain impregnated bamboo charcoal and stirred for several hours for silver impregnation, followed by filtering, washing with water, and drying to obtain silver-impregnated bamboo charcoal; And
Mixing the silver-added bamboo charcoal with the synthetic resin, and then extruding the mixture,
The synthetic resin may be selected from the group consisting of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyamide, polyacrylate resin, acrylonitrile butadiene styrene resin, acrylonitrile ethylene resin, polymethyl methacrylate, polyacetal, A vinylidene resin, a polycarbonate, and a mixture thereof.
Wherein the silver impregnated bamboo charcoal and the synthetic resin are contained in a weight ratio of 1: 4 to 5. [6] The method of claim 5, wherein the silver nitrate or silver chloride and bamboo charcoal are used in a weight ratio of 1:90 to 110. [ A resin molded article containing bamboo charcoal produced by injection molding the antibacterial plastic pellets of claim 1 as a raw material.

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