KR101191799B1 - Composition for synthetic woods and its manufacturing methods - Google Patents

Abstract

PURPOSE: A composition for light weighted artificial wood and a manufacturing method of light weighted artificial wood using the same are provided to be light weighted by being manufactured through resin coating and foaming of more than half of rice hulls. CONSTITUTION: A manufacturing method of light weighted artificial wood(10) using the composition for light weighted artificial wood comprises the following steps: resin coating more than half of rice hulls out of the whole rice hulls; and manufacturing the artificial wood through the foaming process of the rice hulls. The chaff, which has enhanced abradability and reduced moisture content, is used instead of wood powder. The manufactured artificial wood has the specific gravity of 0.8-0.9. The reduction in weight of the imitation wood is realized. The texture of the wood is improved, and the light weight of the artificial wood is realized.

Description

Composition for lightweight artificial wood and method for manufacturing lightweight artificial wood using same {Composition for synthetic woods and its manufacturing methods}

The present invention relates to a composition for lightening artificial wood and a method for manufacturing artificial wood using the same, and more specifically, by manufacturing a foam coating by resin coating 50% by weight of the main material, it is possible to manufacture a lightweight structure, and also to produce a low-density water structure. The present invention relates to a lightweight artificial wood composition having excellent physical properties, and a method of manufacturing artificial wood using the same.

Generally, wood is used for construction, as well as various facilities such as leisure, sports, and landscaping, and as a flooring material for vans and containers.However, there is a problem that cracking or cracking occurs frequently due to deformation and corrosion caused by moisture. It has been pointed out as a cause of environmental destruction while damaging the natural forest.

It is used as a substitute for wood by using plastic as a solution to solve the above problems, but the texture or dimensional stability of the plastic itself is limited, so there is a limit to using it as a substitute for wood. It is becoming.

Recently, artificial wood has been developed to solve the problems caused by the products of wood and plastic. Such artificial wood is usually manufactured by kneading and extruding a synthetic resin such as polyethylene, polyvinyl chloride, polypropylene, polyester, and fillers such as wood powder, inorganic powder, and the like.

However, since the conventional artificial wood is heated and molded with synthetic resin powder and wood powder, there is a problem of environmental destruction due to the use of wood powder, there is a problem of the production cost increase due to the use of expensive wood powder.

In addition, the artificial wood of the prior art had a problem of heavy and high specific gravity.

The present invention has been made to solve the above problems, the object of the present invention is to use a chaff less moisture content than wood powder and excellent wearability in order to lighten the artificial wood and to express the texture of the wood, Half of the rice hull resin coating and is produced through a foaming process to provide a light and specific gravity of 0.8 ~ 0.9 artificial wood and its manufacturing method.

According to an aspect of the present invention, 50 to 60 weight of the main material consisting of 50% by weight of chaff in powder form and 50% by weight of chaff in pellet form coated with resin, washed with water and dried to grind to a particle size of 30 to 100 mesh. %, Kaolin powder 7-10% by weight, one selected from the group consisting of polyolefin as resin, ethylene copolymer obtained from copolymerization of ethylene and polar monomer, polyvinylchloride, chlorinated polyvinyl chloride, polystyrene and acryl butadiene styrene resin or With respect to the total weight of the composition consisting of 30 to 40% by weight of two or more kinds of mixtures, 0.05 to 0.5% by weight of crosslinking agent, 1 to 2% by weight of dispersant, 1 to 5% by weight of modifying agent, and 0.01 to 1% by weight of blowing agent are further added. Light weight artificial wood composition may be provided.

In addition, the chaff powder is made by mixing 50 to 70% by weight of chaff powder having a particle size of 80 mesh or more and 100 mesh or less and 30 to 50% by weight of chaff powder having a particle size of 30 mesh or more and less than 80 mesh.

In addition, the light-weight artificial wood composition can be produced by foam molding.

According to another aspect of the present invention, the process of injecting the main material consisting of 50% by weight of chaff in powder form and 50% by weight of chaff in the form of resin coated powder prepared by rinsing and drying the chaff crushed to a particle size of 30 ~ 100 mesh. and; 50 to 60% by weight of the main material, 7 to 10% by weight of kaolin powder, polyolefin with resin, ethylene copolymer obtained from copolymerization of ethylene and polar monomer, polyvinylchloride, chlorinated polyvinyl chloride, polystyrene and acrylobutadiene styrene resin A first mixing step of mixing 30 to 40% by weight of one or two or more mixtures selected from the group in a stirrer; A second mixture in which 0.05 to 0.5% by weight of crosslinking agent, 1 to 2% by weight of dispersant, 1 to 5% by weight of modifying agent, and 0.01 to 1% by weight of foaming agent are added and mixed based on the total weight of mixture A produced by the first mixing process Process; A melt blending step of mixing the mixture B produced by the second mixing step into a blender, kneading by pressing and heating at a temperature of 80 to 160 ° C. for 20 to 40 minutes to obtain a gel-like synthetic raw material; Primary molding the synthetic raw material in a primary molding machine heated to 160 to 210 ° C; Foaming the primary molded product; Putting the foamed molded article into a secondary molding machine to perform secondary molding; A method of manufacturing an artificial wood may be provided, including; molding the molded product formed by the secondary molding process by cooling the temperature of the cooling water differentially at 80 ° C. to 18 ° C., and cutting the finished product to complete the product.

At this time, the stirred synthetic raw material is introduced into the molding machine during the first molding process, and the steel core material having a predetermined width as the inner core material is simultaneously introduced through the nozzle to the synthetic raw material kneaded in the hot compression molding gel state in the cylinder, or the center of artificial wood It can be molded to be spaced from one to five places at designated places.

The present invention uses a chaff less moisture than wood flour and has excellent abrasion, in order to reduce the weight of artificial wood and to express the texture of the wood, but half of them are resin coated and manufactured through a foaming process. By providing a light weight and artificial wood having a specific gravity of 0.8 to 0.9 and its manufacturing method, it is convenient to transport and construct, and has excellent buoyancy, so that it is suitable for use in water structures.

The present invention has the effect of lowering the manufacturing cost without using the wood does not destroy the environment.

In addition, the present invention can produce a variety of shapes and surface texture according to the shape of the molding machine by inserting the artificial wood composition into the molding machine to pressurized heating to produce a artificial wood, excellent mechanical strength, excellent heat resistance and chemical resistance plate or angle Has the effect of obtaining.

1 is a schematic diagram showing a manufacturing process of artificial wood according to the present invention.
2 is a flow chart showing an example of a method for manufacturing artificial wood according to the present invention.
3 is a cross-sectional view of the artificial wood processed by the manufacturing method according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the artificial wood composition and the method of manufacturing artificial wood using the same according to the present invention will be described in detail.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following examples are not intended to limit the scope of the present invention but merely presented by way of example, and there may be various embodiments implemented through the present invention.

1 is a schematic diagram showing a manufacturing process of artificial wood according to the present invention.

Referring to Figure 1, the artificial wood of the present invention proceeds to the step (1), the mixing step (2), the melt compounding step (3), the molding step (4) of introducing the main material.

Light weight artificial wood composition of the present invention is the main material consisting of 50% by weight of chaff in powder form and 50% by weight of rice hull in pellet form prepared by rinsing and drying the chaff crushed to a particle size 30 ~ 100 mesh 50 ~ 60 Wt%, kaolin powder 7-10 wt%, and resin 30-40 wt%.

Other additives may further include crosslinking agents, dispersants, modifiers, and blowing agents.

The chaff powder is preferably used having a particle size of 30 to 100 mesh, more preferably chaff powder having a grain size of 80 to 100 mesh or less 50 to 70% by weight and a grain size of 30 to 80 mesh When mixed with 30 to 50% by weight of powder, excellent texture and physical properties can be obtained, which is more effective.

Here, the chaff powder is not particularly limited, but the chaff powder is preferably a powder obtained by grinding the chaff to dry by hot air drying so that the moisture content is less than 8%.

According to the present invention, the kaolin powder is to control the viscosity, the viscosity is increased when the content exceeds 10% by weight, but there is a disadvantage that the impact absorption is poor, when less than 7% by weight the shock absorption and durability somewhat There is a disadvantage that the viscosity is increased but weak.

According to the present invention, the resin is one selected from the group consisting of polyolefins, ethylene copolymers obtained from copolymerization of ethylene and polar monomers, polyvinyl chloride, chlorinated polyvinyl chloride, polystyrene and acryl butadiene styrene resin (ABS resin) or Mixtures of two or more are used.

Preferably the resin is used in the form of a powder, more preferably pulverized and mixed in a powder form, wherein the powder is preferably a particle size of 80 to 150 mesh.

The resin is not limited to the present invention, PET (polyethylen terephthalate), polyethylene resin (Polyethylene resin), polypropylene resin (Polyproplene resin), polystyrene resin (polystyrene resin), polyamide resin, acrylic resin (acrylic resin) It is also possible to use vinyl chloride resins and celluloid resins.

According to the present invention, a crosslinking agent, a dispersing agent, a modifier and a foaming agent may be further added as other additives to the composition for lightweight artificial wood, which comprises 50 to 60% by weight of the main material, 7 to 10% by weight of kaolin powder, and 30 to 40% by weight of the resin. have.

The purpose of further adding the crosslinking agent is that the crosslinking (curing) reaction occurs by heat when processing the composition for light-weight artificial wood, which may form a large aggregate, in which case it becomes difficult to achieve uniform kneading. Because it can.

In addition, the crosslinking agent also acts to prevent a decrease in physical properties even if a large amount of the main material is added to obtain the texture of the wood.

At this time, the crosslinking agent is preferably about 0.05 to 0.5% by weight based on the total weight of the lightweight artificial wood composition, and if the content is less than this, the effect of addition is insignificant, and in many cases, no further effect increase can be expected. It is just a factor of the price increase.

The crosslinking agent used in the present invention may use a conventional one known in the art.

On the other hand, the purpose of adding a dispersant is to increase the melt flow of water to form a pattern such as natural wood in the extrudate during molding into artificial wood.

At this time, the dispersant is preferably added to 1 to 2% by weight based on the total weight of the composition, when there is an excessive amount of dispersant there is a problem that kneading is difficult.

The dispersant is not particularly limited, but a carboxyl dispersant is preferable as the dispersant.

The modifier is preferably added 1 to 5% by weight based on the total weight of the lightweight artificial wood composition. In this case, if the amount of the modifier in the composition is less than the above range, there is a disadvantage in that the modification effect is insufficient, if there is an excessive amount of the reforming effect is not improved and the cost burden is large.

Although not particularly limited, the modifier preferably uses maleic anhydride.

The blowing agent is preferably added to 0.01 to 1% by weight based on the total weight of the composition for lightweight artificial wood. At this time, if the amount of the blowing agent in the composition is less than the above range there is a disadvantage that the foaming effect is insufficient, if excessive, there is a disadvantage that the physical properties are lowered.

With reference to the accompanying drawings, a method for manufacturing artificial wood using the composition for lightening artificial wood of the present invention described above will be described.

2 is a flow chart showing an example of a method for manufacturing artificial wood according to the present invention.

Referring to FIG. 2, first, the chaff is dried and crushed into a particle size of 30 to 100 mesh to prepare the chaff powder, and 50% by weight of the powdered chaff and 50% by weight of the resin-coated pellet type chaff are mixed with the main material. You are ready.

50-60% by weight of the main material, 7-10% by weight of kaolin powder, ethylene copolymer obtained from copolymerization of polyolefin, ethylene and polar monomer as resin, polyvinylchloride, chlorinated polyvinyl chloride, polystyrene and acrylobutadiene styrene resin A first mixing process of mixing 30 to 40% by weight of one or two or more mixtures selected from the group consisting of a stirrer is performed.

In this case, the first mixing process may be made in one stirrer.

Thereafter, 0.05 to 0.5% by weight of crosslinking agent, 1 to 2% by weight of dispersant, 1 to 5% by weight of modifying agent, and 0.01 to 1% by weight of blowing agent are mixed based on the total weight of the mixture A produced by the first mixing process. The second mixing process is carried out.

In this case, the first mixing process and the second mixing process may be made through a plurality of agitators arranged in the vertical direction.

Next, the mixture B produced by the second mixing process is introduced into a blender, and the mixture is pressed and heated at a temperature of 80 to 160 ° C. for 20 to 40 minutes to perform a melt mixing process of obtaining a gel-like synthetic raw material.

Next, the process of primary molding the synthetic raw material in a primary molding machine heated to 160 to 210 ℃.

In addition, a process of foaming the primary molded product is performed.

At this time, the foaming process may be performed in the atmosphere or a separate vacuum chamber.

Then, the foamed molded product is introduced into a secondary molding machine to perform secondary molding, thereby completing the form of the final product.

Then, the molded product formed in the secondary molding process is cooled by differential cooling water temperature of 80 ℃ to 18 ℃, and then cut to complete the product.

At this time, the stirring time in the first mixing step is not particularly limited, but preferably stirring for 20 to 40 minutes.

According to the present invention, the artificial wood that is molded and discharged into the molding machine is extruded in the form of a plate or block, and is usually subjected to a cooling process during extrusion, in which case the cooling water temperature is increased to increase physical properties such as tensile strength and bending strength. It is preferable to apply 80 degreeC-18 degreeC differentially.

According to the present invention, when the synthetic raw material blended into the molding machine in the molding process, as shown in the accompanying drawings, as shown in Figure 3, at the same time inside the synthetic raw material so that the core material is embedded in the interior of the final processed artificial wood (10) The core 20 can be supplied.

At this time, the inner core material is introduced into the molding material by mixing the stirred synthetic raw material in the molding process into the composite material kneaded in the state of hot compression molding gel in the cylinder at the same time through the nozzle at the same time through the nozzle of the core core Or it is molded so as to be spaced from one to five places at a designated place.

As the inner core 20, a conventional one can be used in order to achieve the object desired in the present invention, and the present inventors used a steel having a predetermined width.

According to the present invention, even when processing the artificial wood using the composition of the present invention can be obtained artificial wood having excellent physical properties such as bending strength, tensile strength, etc., when processing over a certain length when forming a structure such as a bench to the external pressure It can be bent by the case, it is to embed the inner core to prevent this bending phenomenon.

In the case of the artificial wood 10 in which the inner core 20 is embedded, it is possible to prevent the phenomenon of bending due to the external pressure even if processed longer than the normal processing length.

In the above description, when the content of the main material is 60% by weight or more, the shear strength and the bending strength are not preferable, and when the content is 50% by weight or less, the texture of the wood is inferior and the weight is not preferable.

In addition, when the base resin is contained by 40% by weight or more, the strength is improved, but the weight is increased and the texture of the wood is inferior, which is not preferable, and when it is contained at 33% by weight or less, the weight is reduced but the shear strength and the bending strength are not preferable. .

Such a present invention is to obtain any wood products that can replace natural wood by molding the composition for artificial wood in an extrusion molding machine.

In addition, the present invention uses a chaff less moisture than wood flour and excellent wear characteristics in order to lighten the artificial wood and to express the texture of the wood, but half of the resin chaff resin coating, foaming process It is possible to provide a light and manufactured artificial wood with a specific gravity of 0.8 ~ 0.9 and its manufacturing method.

The present invention has the advantage of convenient transportation and construction, excellent buoyancy, suitable for use in waterborne structures, and by replacing natural wood, it can contribute to environmental protection and lower the manufacturing cost.

Such artificial wood according to the present invention can produce a variety of shapes and surface textures according to the shape of the molding machine, excellent mechanical strength, it is possible to obtain a plate or shell material excellent in heat resistance and chemical resistance.

In addition, the artificial wood produced through a series of manufacturing process of the present invention, by mixing evenly when the base resin is melted and finely powdered chaff main material and the base resin, it is possible to obtain an artificial wood of a uniform material as a whole, Since the fiber components are distributed evenly, the texture is soft, unlike ordinary artificial wood, and can be used in various fields such as interior and exterior materials of buildings instead of wood.

1: main material input process
2: mixing process
3: melt blending process
4: forming process
10: artificial wood
20: inner core

Claims (5)

50 to 60% by weight of the main material consisting of 50% by weight of chaff in powder form and 50% by weight of chaff in pellet form prepared by crushing the chaff to dry and crushing to a particle size of 30 to 100 mesh, 7 to 10% by weight of kaolin powder %, 30-40 weight of 1 type, or 2 or more types of mixtures selected from the group consisting of polyolefin, ethylene copolymer obtained from copolymerization of ethylene and polar monomer, polyvinylchloride, chlorinated polyvinyl chloride, polystyrene and acryl butadiene styrene resin As a composition for lightening artificial wood made of%,
Other additives, such as 0.05 to 0.5% by weight, 1 to 2% by weight of dispersant, 1 to 5% by weight of modifying agent, and 0.01 to 1% by weight of blowing agent, are added to the total weight of the composition, and the rice husk powder has a particle size of 80 mesh. 50 to 70% by weight of chaff powder having a particle size of 100 mesh or less and 30 to 50% by weight of chaff powder having a particle size of 30 mesh or more and less than 80 mesh.
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