WO2014051177A1

WO2014051177A1 - Plastic packaging material comprising bamboo activated carbon, and method for manufacturing same

Info

Publication number: WO2014051177A1
Application number: PCT/KR2012/007855
Authority: WO
Inventors: 박득자
Original assignee: Park Deukja
Priority date: 2012-09-27
Filing date: 2012-09-27
Publication date: 2014-04-03
Also published as: KR101362985B1

Abstract

The present invention relates to a plastic packaging material comprising bamboo activated carbon and to a method for manufacturing same. The method for manufacturing a plastic packaging material according to the present invention comprises: a step of mixing bamboo activated carbon and one or more synthetic resins selected from polyethylene and polypropylene by a twin vacuum method; a step of extruding the mixture of the bamboo activated carbon and synthetic resin; a step of molding the extrudate into chips; a step of molding the chips into a product; and a step of molding the chips into a product.

Description

Plastic packaging material containing bamboo activated carbon and its manufacturing method

The present invention relates to a plastic packaging material including bamboo activated carbon prepared by adding bamboo activated carbon to a synthetic resin, and a method for manufacturing the same. More specifically, the bamboo activated carbon and synthetic resin are mixed and extruded into chips of pellets. Then, it relates to a plastic packaging material including bamboo activated carbon to produce a product by molding and a method of manufacturing the same.

Bamboo activated carbon is often prepared by adding adsorption than when bamboo charcoal is made from charcoal. Such bamboo activated carbon has been found to have filtration, purification effect, antiseptic effect, humidity control effect, odor removal effect, negative ion generating effect as well as harmful electromagnetic wave blocking effect. In particular, the electromagnetic wave blocking effect has been shown to absorb electromagnetic waves emitted indoors by charcoal professor Ishihara Ishihara of the Institute of Wood Science at Kyoto University.

In addition, the present applicant has experience with the bamboo activated carbon production method disclosed in the Republic of Korea Patent Publication No. 10-0800632, it is possible to apply by producing a bamboo activated carbon improved micropore and surface area significantly improved adsorption capacity than the existing bamboo activated carbon.

In addition, the plastic packaging material is made of a synthetic resin as a raw material, and has been widely used in various forms due to the advantages such as light weight, excellent processability, economical efficiency of the plastic material. For example, plastic wrap, electronic scratch-resistant film, cell phone exterior case, food containers have the advantage that can be produced by different manufacturing methods.

On the other hand, as interest in health has recently increased, plastic materials may be manufactured by mixing functional additives such as activated carbon with synthetic resins.

However, the following problem occurs in the above method.

When the synthetic resin and the bamboo activated carbon are mixed, the bamboo activated carbon is a hydrophilic material having an irregular surface and a complicated porous structure, whereas the bamboo activated carbon is a light material having an apparent specific gravity of about 0.3, whereas the synthetic resin for producing plastic materials has a specific gravity It is a hydrophobic substance having a high viscosity of about 1.0 and a high viscosity even in a molten state, so that their miscibility is very poor, which makes it difficult to uniformly disperse and mix.

As a result, tearing or molding defects occur at the interface between the bamboo activated carbon and the synthetic resin, and the molten synthetic resin and the fluidity are degraded, resulting in a problem of poor quality in which the char is concentrated at a specific site.

Therefore, a solution for uniformly and simply mixing these two materials has been studied. For example, in Korean Patent Registration No. 10-0302957, charcoal powder having a particle size of 20 μm or less is mixed with a synthetic resin at a volume ratio of 1 to 40 wt% to make chips in pellet form, and then injection or blow molding using the chips as raw materials. It is known to manufacture plastic containers containing char by the method.

However, in the prior art, as a method of manufacturing a plastic material including a general charcoal, there is a problem of insufficient research on the advantages of the bamboo activated carbon and the electron shield generated by including the bamboo activated carbon.

(Patent Document 1) Republic of Korea Patent Publication No. 10-0800632

(Patent Document 2) Republic of Korea Patent Publication No. 10-0302957

(Patent Document 3) Republic of Korea Patent Publication No. 10-1001998

(Non-Patent Document 1) Journal of the Korea Contents Association Vol. 11, No. 9 (2011)-Ⅰ. Introduction 2. Electromagnetic Shielding Characteristics of Charcoal

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, and to improve the mixing properties of synthetic resin and bamboo activated carbon, plastic packaging including bamboo activated carbon that can be uniformly dispersed and mixed and its manufacturing method To provide.

In addition, a plastic packaging material containing bamboo activated carbon and a method for manufacturing the same, which can solve problems such as tearing occurring at the interface between bamboo activated carbon and a synthetic resin and poor fluidity of the molten resin, thereby impairing the quality of coal concentrated in a specific area of the synthetic resin. To provide.

In addition, by using the electronic shielding function of the bamboo activated carbon to provide a plastic packaging material containing bamboo activated carbon and its manufacturing method that can be utilized as an electromechanical exterior material.

In order to achieve the above object and to solve the problems of the prior art, a plastic packaging material including bamboo activated carbon according to the present invention and a method for manufacturing the same, mixing at least one synthetic resin and bamboo activated carbon selected from polyethylene and polypropylene by a vacuum twin method Preparing a mixture of bamboo activated carbon and a synthetic resin; extruding the mixture of bamboo activated carbon and the synthetic resin to produce an extrudate; molding the extrudate into a chip in pellet form; and the chip ) May be formed into a product and forming the chip into a product.

The bamboo activated carbon may be heated to a bamboo charcoal for 2 to 6 hours at 800 to 1200 ℃, it can be prepared in a powder of 10㎛ or less.

The bamboo activated carbon and the synthetic resin are mixed, but the bamboo activated carbon may be mixed in an amount of 5 to 30 parts by weight based on 100 parts by weight of the synthetic resin.

When the bamboo activated carbon and the synthetic resin are mixed, at least one selected from an antioxidant and a dispersant may be added.

At least one synthetic resin selected from polyethylene and polypropylene and bamboo charcoal is heated at 800 to 1200 ° C. for 2 to 6 hours, and the bamboo activated carbon made of powder having a thickness of 10 μm or less is mixed. Bamboo activated carbon is mixed with 5 to 30 parts by weight in a vacuum twin method to prepare a mixture of bamboo activated carbon and synthetic resin, and by extruding the mixture of bamboo activated carbon and synthetic resin to produce an extrudate, the extrudate is pelletized chips It is a plastic packaging material containing bamboo activated carbon manufactured by molding into chips.

Plastic packaging material including bamboo activated carbon according to an embodiment of the present invention has the effect of improving the mixing properties of the synthetic resin and bamboo activated carbon, uniformly dispersed and mixed.

In addition, there is an effect that can improve the occurrence of quality defects in which the char is concentrated in a specific portion of the synthetic resin by reducing the tearing and the fluidity of the molten resin generated at the interface between the bamboo activated carbon and the synthetic resin.

In addition, there is an effect that can be utilized as an electromechanical exterior material by utilizing the electronic shielding function of bamboo activated carbon.

1 is a process chart for explaining a method for manufacturing a plastic packaging material including bamboo activated carbon according to an embodiment of the present invention.

Figure 2 is a photograph of the antimicrobial test results for E. coli of the plastic packaging material containing bamboo activated carbon according to the present invention.

Figure 3 is a photograph of the antibacterial test results for E. coli of the plastic packaging material without bamboo activated carbon according to the present invention.

10: mixing the bamboo activated carbon and synthetic resin

20: step of extruding the mixture

30: shaping the extrudate into chips

40: forming the molded chip into the product

Hereinafter, with reference to the contents described in the accompanying drawings will be described embodiments of the present invention; However, the present invention is not limited or limited by the embodiments. Like reference numerals in the drawings denote like elements.

Referring to FIG. 1, in step 10, bamboo activated carbon and synthetic resin may be mixed.

First, the bamboo activated carbon may be prepared by heating bamboo charcoal. The bamboo charcoal is superior in the electromagnetic shielding effect, water purification effect, antibacterial effect, far-infrared emissivity than ordinary charcoal. When bamboo charcoal is soaked in ordinary water for 24 hours, 82% of lead, 47% of zinc, 42% of iron and 92% of copper are removed. effective.

An embodiment of a process of manufacturing bamboo activated carbon by heating bamboo charcoal will be described below.

In order to manufacture the bamboo charcoal can be carried out the following production method. First of all, a piece of bamboo of constant size was stored in a hopper. And a rotary kiln is preheated to 600 degreeC by a burner. Thereafter, some of the pieces of bamboo stored in the hopper may be charged into the rotary kiln by means of a conveying means such as a screw conveyor provided at the bottom of the hopper. At this time, some of the bamboo pieces to be transferred may correspond to 5 to 10% by weight relative to the weight of the bamboo pieces stored in the hopper. As a small amount of these pieces of carbon are carbonized, the internal temperature of the rotary kiln can be raised.

As described above, when 8 to 10 hours have elapsed after the small amount of bamboo pieces are charged, the internal temperature of the rotary kiln furnace may be increased to about 800 ° C. Thereafter, the remaining pieces of bamboo stored in the hopper may be charged into a rotary kiln.

The rotary kiln is arranged inclined such that the inlet side is 2 to 8 degrees higher than the outlet side. Due to this, the bamboo pieces charged therein can be automatically transferred from the inlet side to the outlet side while the kiln furnace is rotating. Thus, when the rotating kiln is rotated while the bamboo pieces are charged in the rotary kiln, the bamboo pieces may be carbonized while moving inside the rotary kiln according to the inclination angle of the rotary kiln.

When the remaining pieces of bamboo are charged into the rotary kiln, about 2 hours after the carbonization of the remaining pieces of bamboo, steam can be introduced through a steam supply pipe to prevent excessive oxidation of the bamboo charcoal to be produced. The injected steam is prepared by heating 1 to 10 parts by weight of water when the bamboo charcoal 100 parts by weight. The steam may be dispersed inside the rotary kiln for 10 to 30 seconds. When the amount of the steam exceeds 10 parts by weight, the temperature inside the rotary kiln is too low to facilitate carbonization, less than 1 part by weight, it may be difficult to prevent excessive oxidation of bamboo charcoal.

Even when steam is introduced through the steam supply pipe, the internal temperature of the rotary kiln should be maintained at 800 ° C. to produce evenly carbonized bamboo charcoal.

And, 4 hours after the start of carbonization of the remaining bamboo pieces in the rotary kiln furnace with an internal temperature of about 800 ℃, carbonization of the bamboo pieces is completed, it can be bamboo charcoal. The bamboo charcoal may be discharged to the exit provided in the rotary kiln.

Bamboo charcoal discharged as described above is charged to the hopper and transferred to the screw feeder, it can be introduced into the rotary kiln furnace. The rotary kiln may be 2 to 8 degrees higher than the inlet side, such as a rotary kiln for producing bamboo charcoal.

The injected bamboo charcoal may be heated and heated to 800 to 1200 ° C. by a burner in a region adjacent to the inlet side of the kiln furnace. Integrating the bamboo charcoal may last for 2 to 6 hours.

In addition, when the bamboo charcoal is heated to less than 800 ℃, the electromagnetic shielding effect of the bamboo activated carbon is lowered, when heated to more than 1200 ℃, productivity may be reduced. In particular, when the bamboo activated carbon is produced in about 1000 ℃, it is heterogeneous, it can be excellent in the antibacterial power by inhibiting bacterial propagation.

Then, if the glowing bamboo charcoal moves in accordance with the rotation of the inclined rotary kiln 1 to 3 hours after the start of the redness, steam can be introduced into the rotary kiln through the steam supply pipe. When the injected steam is 100 parts by weight of bamboo charcoal, 1 to 10 parts by weight of steam heated water may be added and dispersed for 10 to 30 seconds. When the amount of the steam exceeds 10 parts by weight, the temperature inside the rotary kiln is too low to facilitate carbonization, less than 1 part by weight, it may be difficult to prevent excessive oxidation of bamboo charcoal.

The supplied steam generates carbon monoxide and hydrogen by reacting carbon molecules of the bamboo with water molecules of steam. Secondly, water molecules of the carbon monoxide and the steam may react to cause an activation reaction to generate carbon dioxide and hydrogen molecules.

In this case, due to the activation reaction, the inner pores of the bamboo charcoal may be further increased, and a large number of new fine pores may be formed. Thus, it can be made of bamboo activated carbon having fine pores and surface area can be discharged to the outlet side.

And it is possible to mill the bamboo activated carbon prepared as described above with a particle diameter of 10㎛ or less. When the particle size of the heated bamboo activated carbon is pulverized in excess of 10 μm, the moldability of the plastic packaging material may be reduced. This decreases the synthetic resin and the mixing can be greatly improved.

The synthetic resin to be mixed with the pulverized bamboo activated carbon is a conventional resin formed in the form of a crushing material or a chip, and may be one of at least one synthetic resin selected from polyethylene or polypropylene.

By mixing the pulverized bamboo activated carbon and the synthetic resin, it can be mixed by a vacuum twin method.

For example, by mixing the pulverized bamboo activated carbon and the synthetic resin, it may be mixed using a twin type compounding machine. Synthetic resin may be added to the hopper of the twin type compounding machine, and the pulverized bamboo activated carbon may be added and mixed in a side feeder. And, the input amount of the resin can be adjusted to the main hopper of the twin-type compounding machine, it is preferable to use a device that can adjust the input amount of bamboo activated carbon according to the screw rotation speed of the compounding machine.

At this time, the input amount to be mixed with the bamboo activated carbon and the synthetic resin, when the synthetic resin is 100 parts by weight, the bamboo activated carbon may be mixed in 5 to 30 parts by weight. When the bamboo activated carbon is mixed in less than 5 parts by weight, it may be difficult to achieve the electromagnetic shielding effect of the bamboo activated carbon, and when mixed in excess of 30 parts by weight, the plastic packaging including the bamboo activated carbon may be lowered.

In the cider feeder of the twin-type compounding machine, the bamboo activated carbon powder is injected, and a vacuum is applied to the cylinder front end portion to prevent the pores from being formed inside the synthetic resin while the synthetic resin and the bamboo activated carbon powder are kneaded.

In addition, when the bamboo activated carbon and the synthetic resin are mixed, at least one selected from an antioxidant and a dispersant may be added.

Then, in step 20, the mixture of the pulverized bamboo activated carbon and synthetic resin can be extruded.

In the compounding machine, a mixture of the pulverized bamboo activated carbon and the synthetic resin mixed may be put into an extruder and extruded.

In step 30, the extrudates of the bamboo activated carbon and the synthetic resin may be formed into chips in the form of pellets.

The extruded product of the extruded bamboo activated carbon and the synthetic resin obtains chips in pellet form.

In addition, a drying process such as hot air may be added to the chip of the synthetic resin containing the bamboo activated carbon as necessary.

In step 40, the molded chip may be molded into a product.

At this time, the chip may be manufactured by plastic injection molding or injection molding.

Example 1

First, the bamboo charcoal according to the present invention, according to an embodiment of producing a piece of bamboo bamboo charcoal.

500 kg of bamboo pieces are stored in the hopper, and the burner is preheated to 600 ° C with a rotary kiln. At this time, the rotary kiln is inclined so that the inlet side is higher than the outlet side by 6 degrees.

And only 37.5 kg of bamboo pieces stored in the hopper is charged into the rotary kiln. These 50kg pieces of bamboo were carbonized for 9 hours, raising the internal temperature of the rotary kiln to about 800 ° C.

Charge 462.5 Kg of the remaining pieces of bamboo into a rotary kiln with the internal temperature of 800 ° C.

According to the inclined angle of the rotary kiln, the bamboo pieces charged into the rotary kiln furnace are carbonized while being transported to the outlet side. 2 hours after the start of the carbonization, steam is added. The steam is steamed by heating 23.13 Kg water and then evenly sprayed onto the piece of bamboo being carbonized for 25 seconds.

When 4 hours have elapsed after the bamboo pieces are charged in the rotary kiln furnace having the internal temperature of about 800 ° C., the carbonization of the bamboo pieces is completed, thereby making bamboo charcoal. The bamboo charcoal may be discharged to the exit provided in the rotary kiln.

100Kg of the discharged bamboo charcoal is charged into a rotary kilo preheated to about 1000 ° C., followed by continuous heating at 1000 ° C. to integrate. When 2 hours have passed since the reddening of the bamboo charcoal, steam is added to generate an activation reaction. The steam is steamed by heating 5Kg water, and then sprayed evenly on the bamboo charcoal being glowing for 25 seconds.

4 hours after the initiation of the reddening of the bamboo charcoal, the redox by heating and the activation reaction to react with steam is terminated, the bamboo charcoal is made of bamboo activated carbon. Then, the bamboo activated carbon prepared as described above is pulverized into a powder having a particle diameter of 10 μm to prepare a bamboo activated carbon powder.

10 Kg of the pulverized bamboo activated carbon powder and 100 Kg of polyethylene (SK, DX800) are added to a twin type compounding machine and mixed in a vacuum state. The mixture is then transferred to an extruder to produce an extrudate. Then, the extrudate is molded into chips, and the chips are injection molded into a circular container having a thickness of 3 mm, a diameter of 100 mm, and a height of 50 mm.

Example 2

Bamboo charcoal and bamboo activated carbon using the same method are prepared in the same manner as in Example 1, but the bamboo charcoal is heated by heating to 800 ° C. in a rotary kiln preheated to about 800 ° C., and then pulverized into a powder having a particle diameter of 10 μm. Activated carbon powder is prepared.

10 Kg of the bamboo activated carbon powder and 100 Kg of polyethylene are added to a twin type compounding machine and mixed in a vacuum state. The mixture is then transferred to an extruder to produce an extrudate. Then, the extrudate is molded into chips, and the chips are injection molded into a circular container having a thickness of 3 mm, a diameter of 100 mm, and a height of 50 mm.

Comparative Example 1

Commercially available charcoal is pulverized into a powder having a particle diameter of 10 μm.

10 Kg of the said charcoal powder and 100 Kg of polyethylene are put into a twin type compounding machine, and mixed in a vacuum state. The mixture is then transferred to an extruder to produce an extrudate. Then, the extrudate is molded into chips, and the chips are injection molded into a circular container having a thickness of 3 mm, a diameter of 100 mm, and a height of 50 mm.

Comparative Example 2

Use ordinary plastic containers made only of synthetic resins that do not contain charcoal or other substances.

Comparative Example 3

Bamboo charcoal and bamboo activated carbon using the same method are prepared in the same manner as in Example 1, but the bamboo charcoal is heated to 600 ° C. in a rotary kiln preheated to about 600 ° C., and then thermally integrated, and then pulverized into a powder having a particle diameter of 10 μm. Activated carbon powder is prepared.

10 Kg of the bamboo activated carbon powder and 100 Kg of polyethylene are added to a twin type compounding machine and mixed in a vacuum state. The mixture is then transferred to an extruder to produce an extrudate. Then, the extrudate is molded into chips, and the chips are injection molded into a circular container having a thickness of 3 mm, a diameter of 100 mm, and a height of 20 mm.

Test Example 1

The amount of minerals eluted from the activated carbons of Example 1 and Comparative Example 1 is measured. Bamboo activated carbon prepared in Example 1 and the spleen char of Comparative Example 1 are each put in a container of the same material by 100g. Then, 10L of the same water is added to a container containing activated carbon and charcoal, respectively, and the amount of mineral leaching is measured after 1 hour. This is shown in Table 1 below.

Test Example 2

Far-infrared emissivity is measured for the bamboo activated carbon prepared in Example 1 and the charcoal of Comparative Example 1. Far-infrared measurement uses the FT-IR Spectrometer to measure the emissivity and radiant energy against the block body while changing the wavelength to 5 ~ 20㎛. This is shown in Table 1 below.

Table 1

	Item (unit)	Example 1	Comparative Example 1
Test Example 1	Calcium (µg / L)	0.39	0.63
	Potassium and Sodium (µg / L)	1.04	0.34
	Silicon (µg / L)	1.60	0.00
Test Example 2	Measurement temperature (℃)	40	50
	Emissivity	0.93	0.93
	Radiation energy (W / ㎡ · ㎛)	3.74 × 10 ²	3.83 × 10 ²

As can be seen in Table 1, when comparing the total mineral content of the bamboo activated carbon prepared in Example 1 and the non-charcoal charcoal of Comparative Example 1, it can be seen that the bamboo activated carbon of Example 1 has a high amount of potassium, sodium and silicon. .

In addition, as can be seen in Table 1, when comparing the far-infrared measurement results of the bamboo activated carbon prepared in Example 1 and the spleen coal included in Comparative Example 1, the bamboo activated carbon of Example 1 including the bamboo activated carbon measured temperature and radiation energy Was found to be lower than the charcoal of Comparative Example 1.

Thus, it can be seen that the charcoal included in the synthetic resin is more effective when bamboo activated carbon is used than charcoal.

Test Example 3

Using the plastic containers prepared in Example 1 and Comparative Example 2, the antimicrobial effect against E. coli and Staphylococcus was measured. The same initial bacterial counts were cultured in the plastic containers prepared in Example 1 and Comparative Example 2, and after 24 hours, the cultured bacterial counts were measured.

TABLE 2

Item	Exam conditions			result
Item	Initial bacterial count	Comparative Example 2	Example 1	result
Escherichia coli	3.6 × 10 ⁵	1.3 × 10 ⁷	<10	99.99%
Staphylococcus	2.0 × 10 ⁵	3.3 × 10 ⁵	<10	99.99%

And the results of the antibacterial test for E. coli is shown in Figures 2 and 3. Figure 2 is a photograph of the antimicrobial test results for E. coli of bamboo activated carbon according to Example 1, Figure 3 is a photograph of the antimicrobial test results for E. coli without the addition of bamboo activated carbon. 2 and 3 also show the difference in the antimicrobial effect to the naked eye.

Thus, the plastic packaging material including the bamboo activated carbon according to an embodiment of the present invention has the effect of improving the mixing of the synthetic resin and bamboo activated carbon, and uniformly dispersed and mixed.

In addition, there is an effect that can improve the occurrence of quality defects concentrated on a specific portion of the synthetic resin by reducing the tearing and the fluidity of the molten resin generated at the interface between the bamboo activated carbon and the synthetic resin.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and various changes and modifications can be made by those skilled in the art within the scope of the claims. It is self-evident.

Claims

Preparing a mixture of bamboo activated carbon and synthetic resin by mixing at least one synthetic resin selected from polyethylene and polypropylene and bamboo activated carbon by a vacuum twin method;

Extruding the mixture of the bamboo activated carbon and the synthetic resin to produce an extrudate;

Molding the extrudate into chips in the form of pellets; And

Molding the chip into a product;

Plastic packaging material manufacturing method comprising bamboo activated carbon comprising a.
The method of claim 1,

The bamboo activated carbon is a method for producing a plastic packaging material including bamboo activated carbon, characterized in that the bamboo charcoal is heated for 2 to 6 hours at 800 to 1200 ℃, and made into a powder of 10㎛ or less.
The method of claim 1,

The mixing step,

Mixing the bamboo activated carbon and the synthetic resin, the bamboo activated carbon with respect to 100 parts by weight of the synthetic resin is a plastic packaging material containing bamboo activated carbon, characterized in that for mixing 5 to 30 parts by weight.
The method of claim 1,

The mixing step,

When the bamboo activated carbon and the synthetic resin is mixed, at least one selected from an antioxidant and a dispersant is added to the plastic packaging material manufacturing method comprising a bamboo activated carbon.
At least one synthetic resin selected from polyethylene and polypropylene and bamboo charcoal is heated at 800 to 1200 ° C. for 2 to 6 hours, and the bamboo activated carbon made of powder having a thickness of 10 μm or less is mixed. Bamboo activated carbon is mixed with 5 to 30 parts by weight in a vacuum twin method to prepare a mixture of bamboo activated carbon and synthetic resin, and by extruding the mixture of bamboo activated carbon and synthetic resin to produce an extrudate, the extrudate is pelletized chips A plastic packaging material comprising bamboo activated carbon, characterized by being molded into chips.