KR20030055351A - An artificial wood having high strength and high thermal resistance - Google Patents

Abstract

PURPOSE: Provided is an artificial wood having high strength, high heat-resistance and beautiful surface by using blast furnace slag as main material. CONSTITUTION: The artificial wood comprises at least one material selected from blast furnace slag, CaCO3 and stone powder, being less than 1micrometer in size, as main material, and other additives such as 20-100pts.wt. of wood powder with a size of 100micrometer, less than 30pts.wt. of cement, and 20pts.wt. of latex base on styrene butadiene, wherein the amount of each additive is based on 100pts.wt. of main materials. The resultant artificial wood applied to floor materials and tiles has compression strength more than 175kg/cm2 and no transformation at 200deg.C.

Description

An artificial wood having high strength and high thermal resistance

The present invention relates to artificial wood that can be used in building materials, and more particularly to artificial wood having excellent strength and heat resistance using by-products such as blast furnace slag as a main raw material.

As urbanization and industrialization are accelerating, the use of timber is gradually increasing, and the depletion of forest resources is accelerating. Therefore, as the demand for artificial wood, which can replace natural wood, has grown, veneer plywood and the like have been used. However, this also has the disadvantage that the main raw material is wood and its use is limited.

As a representative technique of artificial wood in which the main raw material is replaced with another material, a manufacturing method by heat by mixing plastic and wood powder is known. By the way, in the case of artificial wood using a plastic, all the physical properties depend on the plastic has a strength at room temperature, but the plastic is weak to heat has a disadvantage of poor thermal stability.

On the other hand, in the blast furnace of the steel mill, blast furnace slag is generated as a by-product in the process of manufacturing pig iron using steel stone, coke limestone, and the like. Blast furnace slag is a by-product, but the amount is very large, but it is discarded because there is little use. The main components of blast furnace slag are shown in the following table.

Ingredient CaO SiO ₂ Al ₂ O ₃ MgO FeO MnO Content (% by weight) 41 33.4 14.5 6 0.4 0.7

Typical applications of blast furnace slag are cement additives (Korean Patent Publication Nos. 95-17803 and 95-700862), and their usage is only small. As another place of use, it is known to use as aggregate (Korea Patent Publication No. 90-001617) at the time of road construction. In addition, there are known methods for using concrete aggregates, ground improvement materials, crushed aggregates, etc., but the use of new materials is required due to the large amount generated.

Therefore, there have been attempts to use the blast furnace slag for various purposes, and there is a method of manufacturing a tile using the blast furnace slag as a representative example. This technique is a method in which blast furnace slag is mixed with other additives and sintered at a temperature of about 1200 ° C. or more. The sintering temperature is so high that there is a limit in workability and the surface of the molded article is rough.

The present invention has been proposed in the course of studying a method of using various materials including the blast furnace slag, which has not been considered as a raw material of artificial wood, as a raw material of artificial wood.

The inventors of the present invention solve the problem of heat resistance, as well as provide a beautiful and high-strength artificial wood of the surface material, an object thereof.

Artificial wood of the present invention for achieving the above object,

The powder is 20 to 100 parts by weight, cement: 30 parts by weight or less, and latex: 20 parts by weight or less based on at least one 100 parts by weight selected from the group consisting of blast furnace slag, calcium carbonate and stone powder.

Hereinafter, the present invention will be described in detail.

The artificial wood of the present invention uses one type selected from high-strength blast furnace slag, stone powder, and calcium oxalate as a mattress, and appropriately mixes wood powder, cement, and lactese to give a texture as artificial wood and to have strength and heat resistance. There is a characteristic.

Mattress (At least one selected from blast furnace slag, stone powder, calcium carbonate as the main raw material)

In the present invention, at least one selected from blast furnace slag, stone powder and calcium carbonate is used as the main raw material. The amount of these main raw materials is determined by the relative amounts of wood flour, latex and cement. These main raw materials are crushed and used in the form of powder. The finer the particles, the finer the powder is, the better the strength of the molded article is. Preferably, less than 100 microns was evaluated as being good for securing the strength of the molded article by minimizing the voids between the particles.

In the present invention, the blast furnace slag can be a slag generated in the blast furnace of the steel mill, the typical composition is shown in Table 1. In addition, stone powder can use the stone powder which arises in a stone factory, and calcium carbonate can use what is industrially obtained. Among them, blast furnace slag which is easy to obtain and can be purchased in large quantities is most suitable.

Wood powder: 20-100 parts by weight based on 100 parts by weight of the main raw material

Wood powder is used for the texture of wood, but when the amount is less than 20 parts by weight based on 100 parts by weight of the main raw material, the texture is not good as wood, and when it is more than 100 parts by weight of blast furnace slag, the texture as wood is excellent. Difficulties in mixing and molding And a rapid decrease in strength.

It is preferable to use wood powder of 100 microns or less. If the size of the wood flour is larger than this 100 microns, it is difficult to mix with the main raw material and the voids between the particles are increased, resulting in a decrease in strength due to the large voids in the molded article, and it is difficult to express the texture of the artificial wood.

Cement: 30 parts by weight or less based on 100 parts by weight of the main raw material

Cement is a material for maintaining strength, and can be used as long as it is a normal cement including portland cement, which is a general construction cement. As the amount of cement added increases, the strength is improved, and even if it exceeds 30 parts by weight with respect to 100 parts by weight of the main raw material, the strength improvement is not large. The preferred amount of cement is 10 to 30 parts by weight or less based on 100 parts by weight of the main raw material to ensure adequate strength.

Latex: 20 parts by weight or less based on 100 parts by weight of the main raw material

Latex is added for the strength reinforcing effect of the cement and the turnability of the moldings. There are many kinds of latex, but is not limited to the kind most preferably styrene-butadiene-based latex is preferred. The amount of latex added is preferably 20 parts by weight or less based on 100 parts by weight of the main raw material. When the amount of latex added exceeds 20 parts by weight, the strength drops rapidly. Preferably, 5 to 20 parts by weight of latex is added to 100 parts by weight of the main raw material. If the added amount of latex is 5% by weight or less, the surface of the molded product is somewhat rougher than the decrease in strength, and the elasticity is not so high. In order to increase the impact resistance of artificial wood, it is advantageous to increase the content of latex, but the economy is poor.

·Manufacture process

According to the present invention, when the raw materials are mixed and molded to have the composition described above, an artificial wood molded article is obtained. The mixing order of the raw materials is a step of obtaining a first mixture by uniformly mixing the main raw materials (blast furnace slag, etc.), wood flour and cement in a constant content ratio,

Mixing latex and water in this mixture to form a final mixture,

Compression molding of the final mixture.

Also in the present invention, water is mixed and molded in the same manner as in the usual method, and the amount of water may be appropriately determined in consideration of moldability. Generally, the water content is fixed at 10-20% as a whole, which is difficult to form when it contains 10% or less of water, and when it is included by more than 20%, it is mixed in the form of concrete mortar when mixing. Molding is impossible and if possible, moisture is likely to fall out of the mold during pressurization.

Molding is performed by putting the final mixture into a mold for pressurization at a constant pressure (for example, a pressure of 3-6 tons) at room temperature and then removing it from the mold.

The molded article obtained in this way does not fall in strength compared to existing natural wood or plastic wood, and is rather excellent in heat resistance. The moldings provided according to the invention have a compressive strength of up to 175 Kg / cm ² or more, which shows a great strength improvement compared to conventional concrete blocks (compressive strength 50 Kg / cm 2). In terms of heat resistance, there is no deformation even above 200 ℃, which conventional plastic or artificial wood cannot withstand.

Hereinafter, the present invention will be described in more detail with reference to Examples.

EXAMPLE

The blast furnace slag of Table 1 was ground in powder form using a ball mill (or grinder) to make the particle size less than 100 microns in diameter. Wood flour also used less than 100 microns. The blast furnace slag was mixed with varying amounts of wood flour, portland cement and styrene-butadiene-based latex, and an appropriate amount of water was added to adjust the total amount of water within 10-20%.

In the mixing method, the blast furnace slag, wood powder and cement were added in a content ratio, pre-mixed, mixed uniformly with each other, and finished with a suitable amount of latex and water. The mixing method is the same as the mixing method of the existing concrete composition. The composition mixed uniformly was put in a mold and pressurized at a pressure of 3-6 tons at room temperature, and then decompressed to prepare artificial wood.

After drying the molded product at room temperature for 7 days or more, the resultant was observed for 1 hour at 200 ℃ oven, and the results were shown in Table 2 below. The compressive strength according to the composition of artificial wood was measured and the result Are shown in Tables 3, 4, and 5 below.

Kinds Natural wood Plastic wood Development shape △ × ◎ ×: defective △: normal ◎: excellent

Blast furnace slag Wood powder * cement* Latex * Compressive Strength (Kg / cm ² ) 100 20406080100 10 5 189193210208187 100 20406080100 10 10 210221256243209 100 20406080100 10 20 175186199197191 * Indication component is addition amount to 100 parts by weight of blast furnace slag

Blast furnace slag Wood powder * cement* Latex * Compressive Strength (Kg / cm ² ) 100 20406080100 20 5 199201228217199 100 20406080100 20 10 225239276253219 100 20406080100 20 20 183196209203200 * Indication component is addition amount to 100 parts by weight of blast furnace slag

Blast furnace slag Wood powder * cement* Latex * Compressive Strength (Kg / cm ² ) 100 20406080100 30 5 209213220228210 100 20406080100 30 10 230251289263239 100 20406080100 30 20 215224243232221 * Indication component is addition amount to 100 parts by weight of blast furnace slag

As shown in Tables 3, 4, and 5, the content of wood flour showed the highest strength in all compositions when added to 60% by weight based on 100 parts by weight of blast furnace slag, and the amount of cement added was 30% by weight, and 10% by weight in latex content. Showed the best intensity value.

Example 2

Except for using calcium carbonate instead of blast furnace slag in Example 1 to make artificial wood, the compressive strength of the artificial wood was measured and the results are shown in Table 6.

Calcium carbonate Wood powder * cement* Latex * Compressive Strength (Kg / cm ² ) 100 20406080100 30 5 199203218215210 100 20406080100 30 10 231241278263242 100 20406080100 30 20 216225247231225 * Indication component is addition amount per 100 parts by weight of calcium carbonate

Example 3

Except for using stone powder instead of blast furnace slag in Example 1 to make artificial wood, the compressive strength of the artificial wood was measured and the results are shown in Table 6.

Stone powder Wood powder * cement* Latex * Compressive Strength (Kg / cm ² ) 100 20406080100 30 5 211213222225208 100 20406080100 30 10 221241273251222 100 20406080100 30 20 211220233232221 * Indication component is added amount per 100 parts by weight of stone powder

As described above, the artificial wood of the present invention has a beautiful surface texture, cold material, excellent strength, and excellent heat resistance compared to conventional concrete moldings or artificial wood, and thus has a useful effect that can be applied to flooring or tiles. It is.

Claims (3)

Per 100 parts by weight or more selected from the group consisting of blast furnace slag, calcium carbonate and stone flour, Wood powder: 20-100 parts by weight, cement: 30 parts by weight or less, latex: 20 parts by weight or less, high strength, high heat-resistant artificial wood. The high-strength, high-temperature artificial wood of claim 1, wherein the blast furnace slag, calcium carbonate, stone powder, and wood flour are 100 microns or less in size. The high-strength high heat-resistant artificial wood according to claim 1, wherein the artificial wood has a compressive strength of 175 kg / cm ² or more and has no heat resistance at 200 ° C without deformation.