KR20100070790A - Manufacturing method for processing and strong as functional charcoal board - Google Patents

Abstract

PURPOSE: A method for manufacturing a functional charcoal board is provided to have superior workability and strength and to be used as interior material of a storage in which artifacts are stored using humidifying function and gas absorption function of the charcoal. CONSTITUTION: A method for manufacturing a functional charcoal board having excellent workability and strength comprises the followings steps: mixing charcoal particle 10~70 weight% with wood element 90~30 weight% which is selected from wood fiber for MDF, wood particle, and wood bleached chemical pulp; adding an adhesive to the mixture; and molding the mixture within a temperature range of 150~200°C and a pressure range of 0~40kgf/cm^3.

Description

Manufacturing method for processing and strong as functional charcoal board}

The present invention is a charcoal and wood elements of wood charcoal, wood particles, wood chemical pulp using the characteristics of the charcoal while exhibiting excellent charcoal and wood elements with excellent performance, such as cutting or nailing as a board or panel. It relates to the production of a mixed charcoal board.

     In general, the structure of the charcoal is a micropore in which numerous porous bodies that come out of sap from carbon cells when they are carbonized are formed like a pipe assembly. The secret of charcoal smell absorption power is that these porous bodies are open to the outside and inside. Adsorbs compounds molecules such as ammonia, carbon gas, nitrogen, carbon monoxide, methane, hydrogen and oxygen, which are the sources of odors suspended in air, to remove harmful odors. In addition, the charcoal can be provided indefinitely the anion that generates carbon as a carbon agglomerate, and if you enter the place where the charcoal is placed indoors, you can feel the air fresh, fresh and comfortable body. This is because char neutralizes cations and increases anions to create cool air. Far-infrared rays emitted by charcoal are a kind of electromagnetic waves that are invisible to the eye. Unlike other electromagnetic waves, they are absorbed well by the human body and generate vibration energy at the molecular level, which makes the human body warmer and more comfortable.

 In the prior art, Japanese Unexamined Patent Application Publication No. 6-23713 (1994.2.1) has developed a method of manufacturing a charcoal panel in which charcoal particles are impregnated with an adhesive and mixed with fibrin to solidify into a plate shape. There existed a fault that the mixing ratio of an adhesive agent was high. In addition, Korean Patent Publication No. 10-2005-8255 (2005.1.21) describes a method of manufacturing a charcoal board formed by applying an adhesive to a charcoal particle and applying pressure under a heated state to form a charcoal board, but with high far infrared rays. Although the functional charcoal board and the charcoal board composite material radiating emissivity have been shown a manufacturing method that fully exhibits the functional properties of charcoal, the strength and processability of the building material is poor.

In developed countries such as Japan, the Building Standard Act was amended from July 2003 due to the Sick House issue. Therefore, the housing industry and the timber industry have been quick to respond to environmental problems to solve the VOC problem. Doing. According to the Ministry of Environment, domestic indoor environmental pollution VOC concentration in 2000 was 600ppb indoor pollution of domestic buildings more than 3 months after construction with paper wallpaper (3833㎍ / ㎡h), various paints, formarin adhesives used for manufacturing wood materials. That's more than eight times the baseline. Therefore, products using charcoal as a building material purify these volatile organic compounds, remove bad odors, and have repair, aeration, adsorption, and heat storage properties, so as not only air purification but also emit far infrared rays and anions, noise prevention, electromagnetic waves and harmful wavelengths. If you express the properties of char as it blocks, it can be said to be the best human-friendly material as a building material.

     Therefore, in order to solve the above-mentioned drawbacks of the charcoal board while having the functionality of charcoal, it can be said that a combination utilizing the processability of wood elements is indispensable. For this purpose, it is necessary to identify the mixing ratio of charcoal and charcoal and the size of charcoal which showed the best functionality, strength and processability. In addition, the amount of adhesive and water should be identified and appropriate thermocompression process should be identified so that it can be composed of charcoal and wood elements without dissipation of formaldehyde or VOC. Through this, the technology of manufacturing so that the advantages of charcoal and the elements of wood can be maintained is very important.

Therefore, the present invention has excellent strength properties and processability that the existing charcoal boards do not have by combining with wood elements while maintaining the functionality such as gas adsorption of charcoal. The present invention relates to the development of functional charcoal boards in which wood elements are combined.

In order to achieve the above object, in the present invention, charcoal is used to form oak white charcoal, which is generally used, and black charcoal or activated carbon may be used for the same purpose. There are three types of wood elements. The first wood element uses wood fiber for MDF (Medium Density Fiberboard), in which the wood chips are separated into fibers using a wood defiberator, and the second is used for ordinary particle board. The wood particle face material and core material of 1 ~ 25 mesh size are used, and the wood bleaching chemical pulp for papermaking is used. As the adhesive for bonding the laminate, a polyvinyl adhesive and an isocyanate adhesive, which are eco-friendly adhesives having no VOC problems, were used.

Using this, the proper mixing ratio of charcoal and charcoal particles and the size of charcoal particles for the development of functional charcoal boards were investigated, and the manufacturing method was controlled by controlling the mixing ratio and manufacturing process of the adhesive according to the mixing of charcoal and wood.

The present invention relates to a method of producing a functional charcoal board using a mixture of charcoal and wood elements, wood fiber, wood particles, wood chemical pulp. Such charcoal boards have functionality, processability and sufficient strength, so that they can be used as well as conventional panels. This charcoal board can be widely used as a special building material for improving health and living environment, and utilizes the characteristics of charcoal with excellent temperature and humidity control and air purifying ability (anion and adsorption, far-infrared effect, and anti-fungal effect). Therefore, it will be able to be used in the preservation box for preventing the decay of wood relics and old documents and improving the preservation. In addition, it can be used as a storage material for storage of items that are not exhibited by using the humidity and gas adsorption capacity of charcoal.

In order to achieve the above object, the present invention uses oak white coal, which is commonly used as a material of wood elements and charcoal, to use as charcoal, and general black charcoal or activated carbon does not depart from the object of the present invention. The wood elements are wood fiber for MDF, in which the wood chips of the chip state are separated into fibers using a wood defibrator, wood particle face material or core material of 1 to 25 mesh size that is usually used for particle board, and paper for wood At least one of the three kinds of bleached chemical pulp was sufficiently mixed with charcoal, and the adhesive was added, followed by thermoforming in three steps.

With the particle size of charcoal particle less than 40 mesh, it shows the functional properties of charcoal and wood elements, and has sufficient strength and processability of the board. It can be mixed with wood particles and physical or mechanical during board production. A particle size was used that could have strength.

  The mixing ratio of charcoal and MDF wood fiber, wood particles and wood bleaching chemical pulp to make boards that utilize the charcoal function and have physical or mechanical strength of wood elements is based on the total weight of charcoal and wood elements. About 10 to 70% by weight of charcoal and 90 to 30% of wood elements were used. If the charcoal is mixed less than 10% by weight, the adsorption function of the charcoal worsens. If the charcoal mixing ratio is more than 70% by weight, the charcoal adsorption function is excellent, but the physical or mechanical strength of the board is bad.

The type of adhesive for making charcoal boards in which charcoal and wood elements are mixed is an eco-friendly adhesive. The polyvinyl acetate emulsion (PVA, NVC = 42%) resin and the methyl diisocyanate (MDI, NVC = 100%) resin are each Alternatively, a mixed adhesive was used, and the content of the adhesive was formed by using 10 to 25% by weight of the total weight of the raw materials including charcoal and wood elements.

The charcoal board was prepared by applying a pressure in three stages while heating a mixture of charcoal and the like to 150 ~ 200 ℃. For 30 ~ 60 seconds from 0kgf / ㎠ to 40kgf / ㎠ Pressurized slowly, and maintained the pressure for 30 to 60 seconds at 40kgf / ㎠ pressure conditions in two stages, and was molded by applying a pressure for 2-7 minutes at 10 ~ 40kgf / ㎠ pressure conditions in three steps.

 The char-wooden element mixing board manufactured according to the present invention was developed as a functional charcoal board exhibiting the properties of charcoal with excellent strength and processability such as nailing property and bending strength. Through the following examples will be described the present invention.

Example 1 Preparation of Functional Charcoal Board

Raw materials and adhesives for the production of functional charcoal boards use the materials specified above, and the adhesive content for the blending ratio and total weight of the charcoal and wood elements is also used within the range specified above. The thermocompression process for the production of charcoal board temperature was 180 ℃, the total moisture content of the raw material was less than 30%. Pressurization time is 40 ℃ to 40kgf / ㎠ slowly pressurized from 40kgf / ㎠ to maintain 40 seconds, and then pressurized to 30kgf / ㎠ for 5 minutes after changing the pressure conditions.

Example 2 Processability Test of Charcoal Board

In order to evaluate the machinability of the charcoal wood component mixing board, the nailing tensile strength and machinability test were conducted as follows. Wood boards and panels should have a small change in weight due to the excellent workability of the drill or cutting for saws. The tensile strength of nails should also be excellent so that they can be easily connected to each other, making it easy to use as building materials.

In the present invention, the charcoal board of the present invention (Korean patent application: 10-2003-0048137) is not able to measure the strength of the screw pull and the loss rate of the board for cutting is too large of more than 4% of the control board of the charcoal-wood elements mixing board As a comparison, we used paulownia trees, which are widely used as storage boxes for cultural assets.

As shown in Table 1, the wood particle core material and the wood particle face material showed tensile strength similar to that of commonly used paulownia tree even when charcoal was used up to 50% by weight. Using bleaching chemical pulp of MDF fiber, hardwood and softwood, it can be seen that there is no problem in the processability of the board. The weight reduction rate is a measure of the weight loss rate for one time after four cuttings with a length of 20 cm. When the weight reduction rate was used up to 50% under all conditions, the weight reduction rate was less than 1.5%. Through this, the proper mixing ratio of wood element and charcoal is excellent in tensile strength of nailing of charcoal board at 50% of particles for charcoal and 30% of bleaching chemical pulp of hardwood and softwood for MDF. The weight reduction rate after cutting was also 1.5% or less.

Table 1 Nailing tensile strength of charcoal board and weight reduction rate after cutting

Wood element
*One Peace
Tensile Strength-Surface
(N / mm) * 2 Unscrew
Tensile Strength-Surface
(N / mm) * 2 Peace
Tensile Strength-Side
(N / mm) * 2 Unscrew
Tensile Strength-Side
(N / mm) * 2 Weight loss rate
(%) * 3 Paulownia * 4 7.03 36.1 8.14 42.25 1.17 P ・ C: Charcoal 25 # ~ 40 # = 7: 3 42.61 127.23 41.66 76.01 1.33 P ・ C: Charcoal 25 # ~ 40 # = 5: 5 33.05 80.39 28.23 40.12 1.67 P ・ C: Charcoal 25 # ~ 40 # = 3: 7 26.92 53.11 24.21 23.34 1.45 P ・ F: Charcoal 25 # ~ 40 # = 7: 3 52.1 92.09 28.65 51.47 1.2 P ・ F: Charcoal 25 # ~ 40 # = 5: 5 39.86 73.25 26.67 45.22 1.33 P ・ F: Charcoal 25 # ~ 40 # = 3: 7 26.28 50.82 25.46 46.83 1.4 P · C: char 40 # or less = 7: 3 41.15 172.1 39.18 108.22 1.41 P · C: charcoal 40 # or less = 5: 5 37.51 149.86 24.54 47.9 1.52 P · C: char 40 # or less = 3: 7 34.68 79.41 18.54 33.04 1.78 P · F: charcoal 40 # or less = 7: 3 46.04 115.48 41.99 94.83 1.28 P · F: charcoal 40 # or less = 5: 5 43.28 79.04 33.19 66.13 1.35 P · F: charcoal 40 # or less = 3: 7 24.45 34.2 18.96 31.97 1.53 M · F: charcoal 40 # or less = 7: 3 29.71 82.63 14.59 36.12 1.22 M · F: charcoal 40 # or less = 5: 5 27.29 78.04 13.5 35.62 1.36 M · F: charcoal 40 # or less = 3: 7 27.85 52.49 14.47 34.87 1.51 H ・ P: charcoal 40 # or less = 7: 3 11.58 46.15 8.9 18.47 1.2 H · P: charcoal 40 # or less = 5: 5 10.7 33.03 5.03 10.97 1.16 S · P: charcoal 40 # or less = 7: 3 21.62 36.74 14.52 18.2 1.08 S · P: charcoal 40 # or less = 5: 5 17.47 50.39 6.83 11.17 1.2

* 1 P · C: Refers to the core of the particle used for general particle board

   P · F: Particle face used for general particle board

   M · F: Fiber used for general MDF

   H · P: Chemical pulp using hard wood among chemical pulp

   S · P: Chemical pulp using soft wood among chemical pulp

* 2 Peace Nail: 1mm thick nail made with Taka

   Screws: 4mm thick with common screw nails

   Surface: wide side of a board or panel

   Side: thickness of board or panel

* 3 Weight loss rate: One time weight loss rate when cutting 20cm area 4 times by using saw

* 4 Paulownia: This material is used for the preservation box. It is easy to drill and has a good workability.

Table 2 is a measurement of physical and mechanical properties based on KS F 3104 and 3200. In all conditions, physical properties meet the requirements of KS standards. In terms of strength, charcoal-wooden elements blended boards showed more mechanical properties in flexural strength than 100% charcoal boards.

As in Table 1, the charcoal boards are nailed at 50% of the total weight of charcoal particles for wood elements and 30% of bleaching chemical pulp of MDF wood fiber or hardwood and softwood. It can be seen that the results of the tensile strength and the weight reduction rate after cutting are good.

Table 2 Physical and Mechanical Properties of Charcoal Board

Wood element
*One density
(g / cm 3) Water content
(%) Flexural strength
(N / mm ² ) Charcoal 40 # or less * 2 0.73 4.42 4.93 P ・ C: Charcoal 25 # ~ 40 # = 7: 3 0.76 7.72 16.18 P ・ C: Charcoal 25 # ~ 40 # = 5: 5 0.78 9.46 13.22 P ・ C: Charcoal 25 # ~ 40 # = 3: 7 0.75 9.48 10.15 P ・ F: Charcoal 25 # ~ 40 # = 7: 3 0.79 8.74 19.52 P ・ F: Charcoal 25 # ~ 40 # = 5: 5 0.78 9.1 13.47 P ・ F: Charcoal 25 # ~ 40 # = 3: 7 0.78 9.06 9.91 P · C: char 40 # or less = 7: 3 0.73 7.42 15.82 P · C: charcoal 40 # or less = 5: 5 0.69 7.85 12.06 P · C: char 40 # or less = 3: 7 0.77 7.84 9.46 P · F: charcoal 40 # or less = 7: 3 0.77 9.92 16.98 P · F: charcoal 40 # or less = 5: 5 0.76 10.65 10.37 P · F: charcoal 40 # or less = 3: 7 0.74 8.61 8.78 M · F: charcoal 40 # or less = 7: 3 0.82 9.19 21.82 M · F: charcoal 40 # or less = 5: 5 0.82 8.3 18.46 M · F: charcoal 40 # or less = 3: 7 0.8 7.87 12.3 H ・ P: charcoal 40 # or less = 7: 3 0.87 8.61 13.75 H · P: charcoal 40 # or less = 5: 5 0.83 7.25 8.86 S · P: charcoal 40 # or less = 7: 3 0.91 8.11 14.03 S · P: charcoal 40 # or less = 5: 5 0.89 8.02 11.89 P, F + M, F: char 40 # or less = 7: 3 0.76 7.68 19.63 P, F + H, P: char 40 # or less = 7: 3 0.79 8.66 16.47 P, F + S, P: char 40 # or less = 7: 3 0.82 8.31 15.94 M, F + H, P: char 40 # or less = 7: 3 0.83 7.95 18.71 M · F + S · P: char 40 # or less = 7: 3 0.77 8.02 18.24 P, F + M, F + S, P: charcoal 40 # or less = 7: 3 0.79 9.14 18.67

* 1 P · C: Refers to the core of the particle used for general particle board

   P · F: Particle face used for general particle board

   M · F: Fiber used for general MDF

   H · P: Chemical pulp using hard wood among chemical pulp

   S · P: Chemical pulp using soft wood among chemical pulp

* 2 Charcoal 40 # or less: control of this experiment

Example 3 Functional Test of Charcoal Board

Formaldehyde dissipation, TVOC and 5VOC were measured to evaluate the functionality of the charcoal-wood urea mixing board. Formaldehyde emission was measured by the desiccator method according to KS M 1998-4, and TVOC and 5VOC were measured using the small chamber method. The more char is added, the less gas is released. In this test, only the charcoal was added at the minimum of 30% under each condition. As shown in Table 3, each condition showed a dissipation amount of 0.1 (mg / L), far below the 0.3 (mg / L) of SE0, the highest standard of formaldehyde dissipation based on the KS standard. Also, as shown in Table 4, the amount of dissipation of TVOC was much lower than 0.1 (mg / m ² h), which is the highest grade based on the eco-friendly building materials standard. Release was much less than 0.03 (mg / m ² h).

Table 3 Formaldehyde Dissipation of Charcoal Board

Wood element
*One Formaldehyde Dissipation (mg / L) P ・ C: Charcoal 25 # ~ 40 # = 7: 3 0.0265 P ・ F: Charcoal 25 # ~ 40 # = 7: 3 0.027 P · C: char 40 # or less = 7: 3 0.0207 P · F: charcoal 40 # or less = 7: 3 0.023 M · F: charcoal 40 # or less = 7: 3 0.1 H ・ P: charcoal 40 # or less = 7: 3 0.0126 S · P: charcoal 40 # or less = 7: 3 0.0148

* 1 P · C: Refers to the core of the particle used for general particle board

   P · F: Particle face used for general particle board

   M · F: Fiber used for general MDF

   H · P: Chemical pulp using hard wood among chemical pulp

   S · P: Chemical pulp using soft wood among chemical pulp

Table 4 TVOC and 5VOC on charcoal board

Size of wood elements and mumu and charcoal * 1 TVOC
(mg / m ² h) 5VOC
(mg / m ² h) 5VOCs benzene
(mg / m ² h) toluene
(mg / m ² h) Ethylbenzene
(mg / m ² h) Xylene
(mg / m ² h) Styrene
(mg / m ² h) Paulownia Day 7 0.014 0.007 0.000 0.001 0.001 0.001 0.004 Day 21 0.003 0.000 0.000 0.000 0.000 0.000 0.000
P · F: charcoal 40 # or less = 7: 3 Day 7 0.023 0.013 0.000 0.002 0.002 0.002 0.007 Day 21 0.039 0.019 0.000 0.002 0.002 0.002 0.011 M · F: charcoal 40 # or less = 7: 3 Day 7 0.015 0.008 0.000 0.002 0.001 0.001 0.005 Day 21 0.004 0.002 0.000 0.000 0.000 0.000 0.002 H ・ P: charcoal 40 # or less = 7: 3 Day 7 0.012 0.008 0.000 0.003 0.001 0.001 0.004 Day 21 0.019 0.007 0.000 0.002 0.001 0.001 0.004

* 1 P · C: Refers to the core of the particle used for general particle board

   P · F: Particle face used for general particle board

   M · F: Fiber used for general MDF

   H · P: Chemical pulp using hard wood among chemical pulp

   S · P: Chemical pulp using soft wood among chemical pulp

Table 5 shows the adsorption amount of ethylene gas according to conditions according to time in%, and showed higher gas adsorption capacity than paulownia under each condition. And the smaller the particle size of the charcoal showed a higher gas adsorption capacity. The amount of gas adsorption according to the amount of charcoal added was similar to that of 30% and 50% of the total weight of charcoal and wood elements.

Table 5 Ethylene Gas Adsorption Test of Charcoal Board

Size of wood elements and mumu and charcoal * 1 3 hours 6 hours 12 hours 24 hours 48 hours Paulownia 11.37% 13.45% 17.93% 16.76% 17.73% P ・ C: Charcoal 25 # ~ 40 # = 7: 3 8.66% 10.18% 16.29% 28.64% 41.40% P ・ C: Charcoal 25 # ~ 40 # = 5: 5 6.46% 12.47% 17.02% 30.54% 42.21% P ・ F: Charcoal 25 # ~ 40 # = 7: 3 5.63% 13.36% 19.44% 27.02% 40.67% P ・ F: Charcoal 25 # ~ 40 # = 5: 5 7.75% 14.50% 21.36% 32.33% 43.98% P · C: char 40 # or less = 7: 3 5.03% 10.54% 23.88% 34.08% 48.98% P · C: charcoal 40 # or less = 5: 5 7.78% 14.39% 20.80% 33.41% 57.85% P · F: charcoal 40 # or less = 7: 3 8.61% 15.38% 28.92% 39.94% 50.48% P · F: charcoal 40 # or less = 5: 5 7.83% 13.14% 19.66% 46.53% 61.88% M · F: charcoal 40 # or less = 7: 3 8.22% 14.69% 25.19% 36.07% 43.97% M · F: charcoal 40 # or less = 5: 5 2.74% 7.85% 21.25% 36.47% 49.20% H ・ P: charcoal 40 # or less = 7: 3 3.15% 37.34% 52.83% 75.11% 75.98% H · P: charcoal 40 # or less = 5: 5 14.72% 22.84% 38.47% 59.78% 71.71% S · P: charcoal 40 # or less = 7: 3 33.16% 43.43% 57.96% 71.59% 84.18% S · P: charcoal 40 # or less = 5: 5 39.83% 47.37% 64.62% 73.82% 77.96%

From Table 1 to Table 5, the processability and strength of the charcoal-wood elements blending board shows that the charcoal has sufficient functionality such as gas adsorption at 50% and 30% based on the total weight. In addition, in consideration of the far-infrared radiation efficiency emitted from the charcoal, it can be seen that the manufacturing method of the charcoal and wood element mixing board is sufficiently superior in strength and processability while showing the functionality of the charcoal.

1 is a functional charcoal board formed by blending the charcoal and wood elements.

Claims (5)

10 ~ 70% by weight of charcoal particles and 90 ~ 30% by weight of at least one wood element among MDF wood fiber, wood particles and wood bleaching chemical pulp are added, and then the adhesive is added and mixed. Process for producing a functional charcoal board with excellent workability and strength, characterized in that the molded by pressing in three steps in the pressure range of 0 ~ 40kgf / ㎠.        The method of claim 1; Process for producing a functional charcoal board with excellent processability and strength, characterized in that the particle size of the charcoal particle is less than 40 mesh. The method of claim 1; A functional charcoal board with excellent processability and strength, characterized by including 10 to 25% by weight of the total weight of the raw material of the combined charcoal particle and the wood element as an adhesive obtained by combining the adhesive with polyvinyl acetate emulsion and methyl diisocyanate resin. Manufacturing method. The method of claim 1; Wood elements are wood fiber for MDF (Medium Density Fiberboard) in which wood chips are separated by a deflector, wood particle face material or core material of 1 to 25 mesh size used for particle board, and 3 of paper bleaching chemical pulp for paper Process for producing a functional charcoal board with excellent processability and strength, characterized in that it comprises at least one kind of eggplant.      The method of claim 1; While heating the mixture such as charcoal particle at 150 ~ 200 ℃, gradually pressurize for 30 ~ 60 seconds from 0kgf / ㎠ to 40kgf / ㎠ in one step, and for 30 ~ 60 seconds under 40kgf / ㎠ pressure condition in two steps. Maintaining the pressure, the process of producing a functional charcoal board with excellent workability and strength, characterized in that the molded by applying a pressure for 2 to 7 minutes at 10 ~ 40kgf / ㎠ pressure conditions in three steps.

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