KR101812665B1 - Deck Material for Truck Cargo with Outstanding Mechanical Properties - Google Patents

Abstract

The present invention relates to a deck material for a truck loading deck having excellent mechanical properties, and a deck material of the present invention comprises a core 10 made of carbonized wood; And a shell 30 which surrounds the core 10 with a predetermined thickness. The shell 30 constituting the shell 30 is made of a wood-plastic composite material.
As described above, by using carbonized wood as a core material of a deck material for a truck loading deck, excellent mechanical strength against weight can be maintained and the outer circumferential surface of the core material can be wrapped with a wood-plastic composite material excellent in weather resistance, moisture resistance and abrasion resistance A deck material having excellent performance can be provided.

Description

[0001] The present invention relates to a deck material for truck cargo with excellent mechanical properties,

The present invention relates to a deck material for a truck loading deck having excellent mechanical properties, and more particularly, to a deck material for a truck loading deck which is lightweight, easily shrunk or inflated by using carbonized wood as a core material, A deck material for a truck loading deck having excellent mechanical properties, and the like.

Wood has superior mechanical properties such as tensile strength and compressive strength compared with small gravity, and it is easier to process than stone or metal materials, and it absorbs shocks and vibration easily. It is a beautiful and environmentally friendly material. And has traditionally been used not only as a building material, furniture and interior material, but also as a technical material, particularly for trucks.

However, since the wood has a large expansion and shrinkability due to the function, it is easily corroded by the insect damage, the durability is weak, the shrinkage deformation occurs at the time of drying, and cracks and deformation are caused and the cost is high. If used as a tech material, it is exposed repeatedly to the environment of hot and humid summer and cold and dry winter season. Therefore, it should be free from deformation when exposed to various external environments, have durability that can be used for a certain period of time, In order to meet the requirements such as being able to withstand a load equal to or greater than a certain level for loading, the dimensions are unstable due to expansion and contraction due to hygroscopicity and drying, deformation and distortion occur, and deck materials When it is fixed to the loading box, cracks are generated and moisture is absorbed into the wood It is unsanitary due to the microorganism habitat, and the color fade phenomenon occurs when exposed to the sunlight for a long time. Therefore, the above requirements for the truck loading deck material are not satisfied.

In recent years, a variety of artificial woods have been developed and used that can compensate for the disadvantages of the wood as mentioned above, but are also inexpensive and have excellent mechanical properties. For example, wood-plastic composites (WPC, Wood- Composite).

The wood-plastic composite material is a composite material made by extruding a mixture of wood and resin into a certain shape. Since the wood is wrapped in the resin, it can effectively block external moisture absorption and is excellent in weatherability. It is chemically stable because it uses resin, and has the advantage of less discoloration compared to wood. However, it has a disadvantage that it is not only low in mechanical properties but also heavy as compared with wood.

Recently, the artificial wood using the closed-loop polyolefin resin disclosed in JP-A No. 1455731 is filled with wood powder as a core material, and the outer peripheral surface of the core is wrapped with a wood-plastic composite material. Synthetic synthetic wood has been developed and used to complement the mechanical properties of plastic composite materials and to reduce weight.

However, due to the above-mentioned structure, due to the moisture present in the wood used as the core and shrinkage and expansion caused by the moisture in the air, the core material is separated or deformed from the wood-plastic composite material surrounding the outer periphery thereof, - There is a problem that the plastic composite is cracked.

Therefore, it has high strength, light weight, internal structure has hydrophobic property, and is resistant to moisture absorption. Even if moisture absorption and drying are further caused by external environment change, it dries quickly and there is no shrinkage and expansion of core material in drying process. It is necessary to develop a deck material for a truck loading box that is structurally stable and has excellent mechanical properties.

KR 10-1455731 B1 KR 10-0138489 B1 KR 10-0758467 B1 KR 10-1321148 B1 KR 10-2013-0027209 A

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a deck material for a truck loading deck which is superior in strength and light in weight and therefore has excellent strength, light weight, The present invention provides a deck material for a truck loading deck that does not suffer deformation due to shrinkage and expansion of the core material during the drying process and does not cause deformation due to no shrinkage and expansion and has excellent mechanical properties even when additional moisture absorption and drying occur It has its purpose.

It is an object of the present invention to provide a deck material for a truck loading box, comprising: a core made of carbonized wood; And an outer skin that surrounds the outer circumferential surface of the core material to a predetermined thickness, and the outer skin material constituting the outer skin is formed of a wood-plastic composite material.

The present invention is characterized in that the core material is made of a carbonized material having a water content of 5 to 8%.

The present invention also relates to a method for drying wood of a carbonized wood, which is a core material, by drying the wood in a dryer maintained at a temperature range of 100 to 150 ° C for 3 to 4 days, And heated for 48 to 96 hours in a holding furnace.

The present invention is further characterized in that an adhesive layer made of a PE resin or an adhesive based on an olefin resin is formed between the core and the sheath.

In addition, the present invention is characterized in that MA-POE, MA-PE or MA-SEBS adhesive is used as an adhesive for forming an adhesive layer.

Further, the present invention is characterized in that the thickness of the adhesive layer is 0.2 to 2 mm.

The present invention is also characterized in that the outer cover material is a wood-plastic composite material in which 65 to 75 wt% of PE resin and 20 to 30 wt% of wood powder are combined with 1 to 5 wt% of binder.

The present invention relates to a wood-plastic composite material having excellent weather resistance, moisture resistance and abrasion resistance, and which can maintain mechanical strength with respect to weight, while being lightweight and hydrophobic by using carbonized wood as a core material. Wrapping protects the core.

The present invention is characterized in that a PE-based adhesive having a high affinity between the core material and the sheath and high affinity therebetween is applied and firmly bonded to secure a high adhesive strength between the core material and the sheath, Excellent stability against change can be ensured as well.

1 is a perspective view showing a configuration example of a deck material for a truck loading box according to the present invention,
Fig. 2 is a front view of Fig. 1,
Fig. 3 shows experimental results showing the difference in adhesive strength depending on the kind of adhesive and the difference in pressing time.

Hereinafter, the structure and operation of the present invention will be described in more detail with reference to the accompanying drawings showing preferred embodiments.

The present invention provides a deck material for a truck loading box which is light in weight, has improved strength, is not easily damaged even when the core material shrinks and expands, and has excellent mechanical properties and is structurally stable. The ash includes the core 10 and the sheath 30 as shown in Figs.

The core material 10 has a shape of a cross section in the form of a quadrangle and has a bar shape having a length relatively longer than the width, and the raw materials thereof are larch, red pine, yellow pine (SYP), oak, Eucalyptus, ash, malas, and cabbage, and the wood thus selected is dried for about 3 to 4 days in a dryer maintained at a temperature range of about 100 to 150 ° C, thereby primarily removing moisture in the wood.

The wood which is primarily removed by the drying process is heated again for 48 to 96 hours in a heating furnace maintained at a temperature range of 180 to 220 ° C., Lt; RTI ID = 0.0 >% < / RTI >

Generally, wood is composed of 50% cellulose, 23% hemicellulose, 20% lignin (adhesive sugar) and 7% other extracting materials. In the present invention, (H2O), which is a free water that is attracted to hydroxyl groups and freely crosses the cell wall, is dissolved in the water, (H2O) in the wood is firstly evaporated through the forced drying process as described above, and the binding water (-OH) in the cell wall is heated by the subsequent heating of the wood by the high heat The wood is heated at a temperature higher than the ignition point of the wood.

After the above water and carbonization processes are finished and the carbonized wood is formed, the carbonized wood is stabilized by cooling the carbonized wood at room temperature for 18 hours or more.

In the present invention, the cellulose constituting the wood is very hardly crystallized through the secondary water removal, carbonization and cooling steps, and the hemicellulose is converted into the furbal oil and the carboxylic acid, And the durability is improved. The lignin which bonds cellulose and hemicellulose is converted into caramel to prevent it from being turned by ultraviolet rays, and organic matter is removed, thereby suppressing the propagation of dead bacteria, thereby greatly increasing the service life of the wood . In particular, the dimensional change is greatly improved by removing the bonding water (-OH), and it is effectively prevented that the dimensional stability due to the absorption and expansion of water is inhibited.

In the present invention, as described above, the water content of the carbonized wood is 5 to 8% as a result of experiments, and it is confirmed that the carbonized weight is the lightest in weight and the dimensional stability is the best in this water content range.

In summary, according to the present invention, by using carbonized core material, carbon is accumulated through carbonization process, internal structure becomes hydrophobic and is resistant to moisture absorption, and by removing hydroxyl group (-OH) from wood, bending and swelling It has excellent dimensional stability by eliminating the factors that cause it, and the durability is improved by removing the organic materials and the dead bacteria through the carbonization process. Moreover, since the wood having a certain water content is used by the carbonization process, It is possible to secure superior performance as a loading deck material such that the weight is deviated when the load box is manufactured.

A cover 30 is provided on the outer circumferential surface of the core member 10 so as to surround the core member 10. The core member and the resin are combined and extruded into a predetermined shape as the outer cover member, The shell 30 of the present invention is a wood-plastic composite material in which a weather-resistant polyethylene (PE) resin is used as a base and less than about 30% by weight of wood is used as a filler Plastic composite material is used. Specifically, a wood-plastic composite material in which 65 to 75 wt% of PE resin and 20 to 30 wt% of wood powder are combined with 1 to 5 wt% of binder is used.

The wood-plastic composite material produced in this manner has excellent weather resistance, moisture resistance and abrasion resistance, whereby the core material 10 present inside the wood-plastic composite (sheath) is effectively protected.

On the other hand, the higher the content of PE resin in the wood-plastic composites, the easier the processing and the dimensional stability, the higher the manufacturing cost. The higher the wood powder content, the higher the strength of the wood-plastic composite material, In the present invention, when the wood-plastic composite material is produced in consideration of the characteristics of the wood-plastic composite material in accordance with the content ratio of the composition components, the PE resin and the wood powder are used in an amount of 65 to 75 wt% 30% by weight.

When the shell 30 made of the wood-plastic composite material is formed on the outer circumferential surface of the core material 10 made of the carbonized material as described above, the molten wood-plastic composite material is pressurized and supplied to the outer peripheral surface of the core material 10, However, in reality, since the physical properties of the carbonized wood and the wood-plastic composite material are different from each other and there is almost no affinity between the carbonized wood and the wood-plastic composite material, the outer covering 30 is formed on the outer peripheral surface of the core 10, A gap may be formed between the wood-plastic composite material and the core material surrounding the outer circumferential surface of the core material. In this case, the wood-plastic composite material and the core material are separated from each other to sufficiently exhibit their function as a deck material for a truck loading box I can not.

The adhesive layer 20 is formed by applying an adhesive between the core 10 and the sheath 30 so as to exhibit a sufficient function as a deck material for a truck loading box by enhancing the affinity between the core 10 and the sheath 30 MA-POE (Maleic Anhydride Grafted Polyethylene Octene Elastomer), MA-PE (Maleic Anhydride Grafted Polyethylene) or the like having a high affinity with a material constituting the core material 10 and the sheath 30 as adhesives, The thickness t of the adhesive layer 20 is in the range of 0.2 to 2 mm since the thickness of the adhesive layer 20 is 0.2 [mu] m Mm or less, the thickness of the adhesive layer is too thin to sufficiently absorb the deformation due to shrinkage or expansion of the core material 10, and conversely, when the thickness of the adhesive layer 20 is 2 mm or more, the thickness of the adhesive layer is too thick, This is due to the fact that the mechanical properties of the core material 10 are not properly expressed.

When the adhesive layer 20 is formed between the core 10 and the covering 30 as described above, the kind of adhesive constituting the adhesive layer 20, the type of the wood constituting the core 10, There is a difference in the adhesive force between the core 10 and the sheath 30 depending on the pressing time of the adhesive layer 30. Therefore, As a result, the compressive time was a significant factor for the maximum tensile force, and the adhesive and the compression time were significant factors for the deformation at the maximum tensile force, while the adhesive was a significant factor for the breaking tension and the fracture strain (10) and the sheath (30), except for the kinds of wood constituting the core (10), and the type of the wood Squeezed The following experiment was carried out as follows to confirm the influence of the adhesive strength of the adhesive layer 20 on the basis of these experimental factors.

In the subsequent experiment, the pine of the raw material as the core material 10 as described above was dried in a dryer for 72 hours to remove the water of the pine tree first, and then heated for 72 hours in a heating furnace maintained at a temperature of 210 캜 The carbonized carbonized material having a water content of 6% was cooled for 20 hours and then prepared in the form of a sheet material having a thickness of 5 mm to prepare a plurality of sheets. As the adhesive forming the adhesive layer 20, Four types of adhesives were used, namely HDPE base adhesive IRU-500 from Chem, POE base adhesive IRU-700 from LUKEM, LLDPE adhesive MB-10 from LOTTE CHEM., And HDPE adhesive EM-101 from LOTTE CHEM. And a plurality of sheets were prepared in the form of a sheet having a thickness of 1 mm and a wood-plastic composite material composed of 65 wt% of PE resin, 30 wt% of wood powder, and 5 wt% of a binder was used as a sheath material constituting the sheath 30 A plurality of prepared fire extinguishers, adhesives, and sheathing materials are combined to prepare a plurality of sheets in the form of a sheet having a thickness of 2 mm, as in the case of the core material 10, The test specimens were laminated in order to obtain a structure in which the adhesive and the sheath were laminated in order on the upper surface of the fire, respectively. Then, the specimens were squeezed twice using a hydraulic press under a temperature condition of 220 ° C The squeezing time was 15 seconds and 30 seconds, respectively, so as to confirm the influence of the squeezing time.

The present inventors made specimens of 24 [4 (adhesive) × 2 (compression time) × 3 times (number of experiments)] in order to compare the bonding strength of the specimens produced by the above- The tensile test was carried out at a tensile speed of 10 mm / min using a AG-X series universal testing machine and a 500N load cell of "SHIMADZU", with the rubber plate cut to a proper size on the specimen. same. In FIG. 3, MaxF, MaxD, BreakF, and BreakD represent the maximum tensile force, the maximum deformation amount, the breaking tensile force, and the breaking deformation amount, respectively.

division Kinds Remarks One IRU-500 Erichem's HDPE base adhesive 2 IRU-700 Eruchem's POE base adhesive 3 MB-100 LOTTE CHEM LLDPE adhesives 4 EM-101 LOTTE CHEM HDPE adhesives

The inventor of the present invention analyzed the results of the subsequent experiments using the MINITAB 13 as an analysis tool with the 'General Linear Model' as a detailed analysis condition. As a result of the analysis, the evaluation criteria of the adhesive force were broken energy [= maximum tensile force (Mm)), the breaking energy greatly varies depending on the type of adhesive, and the magnitude of the breaking energy becomes larger as the time to which the bonding pressure is applied becomes longer. Therefore, the breaking energy and the breaking strain , It was confirmed that the greatest bonding strength was obtained when the adhesive was applied for a long period of time using the adhesive of POE 2,

INDUSTRIAL APPLICABILITY As described above, according to the present invention, by using carbonized wood as a core material, it is possible to maintain a lightweight, hydrophobic property and thus to be resistant to deformation and to maintain excellent mechanical strength against weight. The outer circumferential surface of such core material is excellent in weather resistance, moisture resistance and abrasion resistance It protects the core material by wrapping with wood-plastic composite material. It also applies adhesives based on PE-based or olefin-based resin with high elasticity and high affinity between core material and sheath, It is possible to ensure a high adhesive strength between the resin and the resin, and at the same time to secure excellent stability against changes in volume such as elongation and shrinkage.

10: core material 20: adhesive layer
30: envelope

Claims (7)

In a deck material for a loading deck,
The deck material comprises: a core (10) made of carbonized material; And a cover (30) covering the outer circumferential surface of the core (10) with a predetermined thickness,
The jacket constituting the jacket 30 is made of a wood-plastic composite material,
Wherein an adhesive layer 20 made of an adhesive based on a PE resin or an olefin resin is formed between the core material 10 and the sheath 30 to have a thickness of 0.2 to 2 mm. Deck ash for loading box.
The method according to claim 1,
Wherein the core (10) is made of a carbonized material having a water content of 5 to 8%.
The method of claim 2,
The carbonized wood constituting the core material 10 is dried in a drier maintained at a temperature range of 100 to 150 ° C. for 3 to 4 days to remove moisture first, By heating in a heating furnace maintained for 48 to 96 hours.
delete The method according to claim 1,
MA-POE, MA-PE, or MA-SEBS adhesive is used as the adhesive for forming the adhesive layer (20).
delete The method according to claim 1,
Wherein the sheathing material forming the sheathing 30 is a wood-plastic composite material comprising 65 to 75 wt% PE resin and 20 to 30 wt% wood powder combined with 1 to 5 wt% binder.

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