KR20030012511A - A method of manufacturing plastic goods including charcoal and goods thereof - Google Patents

Abstract

PURPOSE: A method for manufacturing plastic article containing charcoal which improves merchantability by solving deterioration of forming property generated due to characteristics of charcoal, and plastic article manufactured by the method are provided. CONSTITUTION: The method for manufacturing plastic article containing charcoal comprises the processes of extruding the mixture at a temperature of 130 to 350 deg.C by mixing crushed charcoal with thermoplastic general synthetic resins or crushed recycled plastics; crushing the extruded resin manufactured by the extrusion process; and injection molding the melted and blended resin after melting and blending the extruded resin obtained from the crushing process, wherein the method further comprises the process of extruding the thermoplastic general synthetic resins or crushed/recycled plastics before the mixing and extruding process, the thermoplastic general synthetic resins are one or more synthetic resins selected from the group consisting of polypropylene, polyethylene terephthalate, polyethylene, polystyrene, and polyvinyl chloride, and content of the charcoal is 0.1 to 60 wt.%.

Description

A method of manufacturing plastic goods including charcoal and goods kind}

The present invention relates to a method for manufacturing a plastic product containing charcoal and the plastic product, and more specifically, before the injection of charcoal powder mixed with other resin materials in the injection process of thermoplastics, which has been used as a conventional injection molding material. The present invention relates to a method for producing a plastic product containing charcoal, which exhibits excellent effects such as far-infrared generation, deodorization, etc. by solving the problem of lowering of molding properties caused by mixing injection by passing through an extrusion step.

In general, injection molding refers to injection molding of a plastic resin through a hopper of an injection molding machine, injecting a plastic resin into a mold by a flanger or a scoop, etc., in a fluidized state by melting it in a heated cylinder, and injecting a product into a mold.

Recently, injection molding synthetic resins have been widely used in OA devices such as computers, information and communication devices, interior and exterior materials of automobiles, exteriors of home appliances, household goods, machines, appliances, and large molded products due to the advantages of lightweight, hard and easy molding. However, these synthetic resin molded products have been pointed out as a problem because they not only release environmental hormones but also have bad smell and hygiene.

Recently, as interest in health has increased, functional plastic containers with small amounts of additives such as ocher, ceramic, and elvan have been manufactured.

Charcoal is a porous body composed mainly of carbon and minerals, which prevents oxidation of living organisms, purifies the habitat environment of decaying microorganisms, enhances the freshness of surrounding substances by reducing, purifies water, generates anions and purifies air. It absorbs and deodorizes positrons that cause odors and removes toxic substances.

Oak charcoal is divided into white charcoal and gum charcoal according to its properties. White charcoal and gum charcoal differ in terms of carbon, oxygen, hydrogen, ash, and other components, such as hardness, calorific value, heat sustainability, and thermal power. Gum coal is produced at 400-700 ° C, and white coal is produced at high temperatures of 1000 ° C or higher.

White charcoal is characterized by its high thermal power, long lasting, and fine pores, which have strong adsorptive power. Charcoal white charcoal in Korea is particularly excellent and has been used for a long time as a charcoal roast and fuel. The properties of the sand are hard and give a metallic sound when beaten. Compared to white coal, gum is softer and softer to ignite, and it is less burned and burned, so it is used more for smelting and forging than for cooking.

Wood materials of charcoal are oak, prunus oak, oak, chestnut, larch, pine, cedar, cypress, bamboo, chaff, palm bark, plum, pine, mulberry, etc. The classification of charcoal by cooking, agriculture, There are industrial, environmental improvement, health life, crafts and arts. Depending on the progress of carbonization of charcoal, low-temperature charcoal is carbonized charcoal at 400-500 ℃, charcoal, flat coal and mesophilic charcoal at 600-700 ℃. (Black charcoal) and high temperature charcoal are white charcoal carbonized at around 1000 degreeC.

Solid wood has cellulose, hemicellulose, and lignin, and is composed of elements such as carbon and hydrogen. When heated in an oxygen-free or low-oxygen environment, the wood is decomposed rapidly at around 280 ° C. Gases such as hydrogen and hydrocarbons are generated, and the wood gradually turns into amorphous carbon, which is rich in carbon and irregular in crystals.

When it is heated further to 650 ~ 700 ℃, oxygen or hydrogen decreases gradually and surface properties start to change significantly. In the solid state, the carbon content is 50%, but the carbonization temperature is 400 ° C, 72%, 89% at 600 ° C, and 95% above 1000 ° C.

When the cross section of the char is magnified under a microscope, microns of micropores are formed inside the char. The surface area of 1 g of charcoal is about 300 m 2.

In addition, charcoal has many beneficial properties to the human body, such as abrasive, adsorptive, electromagnetic wave blocking.

Recently, various methods of utilizing charcoal for environmental preservation, agriculture, forestry and fisheries, life improvement, and food processing have been developed using the properties of the charcoal. If you look at some of these,

1) Purification

The adsorption capacity of charcoal is used to purify water for living water, rivers and lakes.

2) Use for agriculture, forestry and fisheries

Currently, charcoal and wood vinegar are used for horticulture, rice fields and fields, and for soil improvement and compost production in the cultivation of vegetables, fruit trees and tea.

3) Application to housing materials

By using the excellent moisturizing effect of charcoal, products such as residential environment moisturizer, wallpaper, floorboard, etc. are produced, and by-products of charcoal are utilized a lot.

4) Use for household goods

It is widely used as a deodorant for purifiers, refrigerators and shoeboxes, and for indoor cleansing. It is also sold as health products such as bed pads, pillows, and cushions.

In addition, charcoal is known to emit far infrared rays. Far infrared rays were discovered by German scientist Hussell in the 18th century and started to be used for the treatment of diseases in the medical field since 1876, and thermal cancer treatment devices have been developed and used in the clinic in Korea. Far infrared rays are called life-growing rays and emit 3.6 to 16 microns of long-wave heat energy. This heat energy penetrates up to 40mm in the skin and expands the capillaries of the human body through the warming of the body, which facilitates blood circulation and circulates the substances of the human body. These rays are emitted from all matter on Earth, but charcoal, loess, stones and ceramics have high emissivity. Far infrared rays are the energy of life that changes the molecular structure of water. When char is put into water, the amount of oxygen increases and water rarely deteriorates.

The charcoal also has the effect of removing odors. It suppresses the occurrence of antiseptic and decaying bacteria, eliminating the source of odor and adsorbing odor.

Despite such various effects beneficial to the human body such as far-infrared emission, conventional charcoal-containing products, such as charcoal boards, wallpaper, and the like, have very low charcoal content, which makes it difficult to achieve the beneficial effect of charcoal.

There have also been many attempts to incorporate charcoal into plastic products. Korean Patent Laid-Open No. 2000-63755 has a step of making charcoal into fine powder of 20 μm or less; Weighing charcoal and plastic raw materials; Mixing the resin with charcoal; And a step of molding the mixed resin and charcoal into a container. The method of manufacturing a plastic container containing a charcoal and a container thereof are disclosed.

In addition, the Utility Model No. 185934 is a plastic container injection-molded by mixing a predetermined amount of charcoal powder, juniper powder, bioceramic powder, jade stone, germanium powder in a resin material such as polyethylene, polyvinyl chloride, polypropylene, etc. Is disclosed.

The above-mentioned patent and registered utility model only discloses injection molding by simply mixing charcoal powder with a resin material, but when the charcoal powder is simply mixed in the injection molding process, a large number of irregular bubbles are generated on the surface of the plastic, and the appearance is extremely extreme. There is a problem that it is poor and not worth as a product. In addition, in the published patent, the char particle size should be 20 μm or less, which is expensive.

Accordingly, the present invention is to provide a method for producing a plastic product containing a charcoal and excellent plastic products by solving the degradation of the molding properties caused by the characteristics of the charcoal.

In addition, the present invention is to provide a method for producing a plastic product containing a large amount of charcoal powder and the plastic product.

In order to achieve the above object, the present invention comprises the steps of mixing the crushed charcoal in a resin or shredded recycled plastic, such as polypropylene, polyethylene terephthalate, polyethylene, polystyrene, polyvinyl chloride and extrusion at 130 ~ 350 ℃;

Crushing the resin produced in the extrusion process; And

And melt blending the crushed mixed extrusion resin obtained in the crushing step, followed by injection molding.

In addition, the present invention may add a step of extruding general-purpose synthetic resin or recycled plastic in order to increase the effect of the mixed extrusion before the mixed extrusion process.

The present invention also provides a plastic product containing charcoal prepared by the above method.

Since charcoal has excellent hygroscopicity and contains a large amount of moisture, when molding with general-purpose synthetic resins for injection molding, there is a problem in that molding properties are significantly reduced due to moisture contained in charcoal. In order to overcome this problem, the method of pulverizing and drying the charcoal finely in the order of several to several tens of micrometers was tried several times. However, the hygroscopicity of the charcoal was so great that it was difficult to see the improvement of the molding properties. Thus, the present inventors have completed the present invention after a long study to solve this problem.

Looking at the manufacturing method of the plastic product containing the charcoal of the present invention in detail.

In the one-stage mixed extrusion process, proper temperature is applied in consideration of different physical properties of each resin. For example, when PET is selected as the synthetic resin, since the melting point is the highest, extrusion is performed at 265 ° C. or higher. The charcoal is preferably crushed to 3 mm or less in particle size, more preferably 1 to 3 mm in particle size, mixed with resin and extruded. Thermoplastic general purpose synthetic resins are used as the resin, including regenerated thermoplastic synthetic resins. It is preferable to use recycled resin by crushing to 5 mm or less of particle diameters.

In the second step, the mixed extruded material is crushed, so that the solid resin is pulverized into grains of a certain size to facilitate the processing of the next step.

In the third step, the resin obtained in the shredding process is melt blended and then injection molded. Depending on the desired charcoal content it can be added a synthetic resin not subjected to a mixed extrusion process. In order to minimize the mechanical properties of the resin and the deterioration of the moldability during molding, it is preferable to keep the char content in the range of 0.1 to 60% by weight. If less than 0.1% by weight, the far-infrared ray emission effect, deodorizing effect, etc. by the char is insignificant, and when it exceeds 60% by weight, moldability and appearance deterioration problems occur.

Plastic products containing charcoal may be prepared by adding inorganic fillers and modifiers as necessary.

According to the method of manufacturing a plastic product containing charcoal of the present invention, the process of extruding the charcoal powder together with the resin instead of adding the charcoal powder in the injection step was able to drastically improve the problem of deterioration of molding properties and poor appearance.

In addition, it is economical because it can produce an injection molding containing charcoal without grinding the charcoal finely to about several micrometers.

The method for producing a plastic product containing charcoal of the present invention provides an injection molding which can effectively perform antibacterial function, far infrared ray emitting function, deodorizing function, electromagnetic shielding, anion emission and the like.

Claims (5)

Mixing and extruding the crushed charcoal in a thermoplastic general-purpose synthetic resin or crushed recycled plastic; Crushing the resin produced in the extrusion process; And And melt blending the crushed mixed extrusion resin obtained in the crushing step, followed by injection molding. The method of manufacturing a plastic product containing charcoal. The method of manufacturing a charcoal-containing plastic product according to claim 1, wherein a step of extruding thermoplastic general-purpose synthetic resin or recycled plastic is added before the mixing extrusion process. The method of claim 1, wherein the thermoplastic general-purpose synthetic resin is at least one selected from the group consisting of polypropylene, polyethylene terephthalate, polyethylene, polystyrene, and polyvinyl chloride. The method of producing a charcoal-containing plastic product according to claim 1, wherein the char content is 0.1 to 60% by weight. A plastic product containing charcoal, prepared by the method of claim 1.