KR20220125446A - Wood strand board composition comprising aqueous inorganic flame retardant adhesive composition and wood strand board manufactured by the same - Google Patents

Abstract

The present invention relates to a wood strand board composition containing coconut inner shell and a wood strand board manufactured thereby. Concretely, the present invention provides a wood strand board composition containing and a wood strand board manufactured thereby, wherein the wood strand board composition contains: coconut inner shell powder; an adhesive composition; an antifungal agent; a mineral-active solvent; and an aqueous inorganic flame-retardant adhesive composition. The wood strand board made of the wood strand board composition containing the coconut inner shell according to the present invention is eco-friendly because of not using formaldehyde-based resin, has excellent water resistance and internal strength, is eco-friendly and non-toxic, and is capable of exhibiting excellent flame-retardant performance.

Description

WOOD STRAND BOARD COMPOSITION COMPRISING AQUEOUS INORGANIC FLAME RETARDANT ADHESIVE COMPOSITION AND WOOD STRAND BOARD MANUFACTURED BY THE SAME }

The present invention relates to a wood strand board composition comprising an aqueous inorganic flame-retardant adhesive composition that can be used for various purposes such as wood, building interior materials, and building materials, and to a wood strand board prepared thereby, and specifically, coconut husk powder; adhesive composition; antifungal agents; Provided are a wood strand board composition comprising a mineral active solvent and an environmentally friendly, non-toxic, water-based inorganic flame-retardant adhesive composition, and a wood strand board prepared thereby.

Countries that depend on imports for timber due to the global expansion of resource protectionism and the destruction of tropical forests are experiencing difficulties in supply and demand, and a new paradigm of sustainable forest management and resource recycling is becoming common. For example, in Indonesia, which supplies tropical timber to us, 40.26 million hectares of forests that have been degraded due to savagery and overexploitation out of 119.7 million hectares of total natural forests, 43% of the areas permitted for logging, have already severe or severe deforestation. As log production is no longer possible, the Indonesian government is in a hurry to implement the Forest Restoration Act next year. In the case of Korea, 95% of wood and wood products are imported, even though 65% is forest. Therefore, the immediate control of the domestic wood industry, which is in the plight of an extremely poor country for wood and wood material raw materials, is to develop domestic wood substitutes as much as possible, foster domestic resources, and improve the efficiency of resource use.

The need for such substitutes for wood resources is already recognized as a global problem, and representative examples of such substitutes include bamboo, kenaf, sisal, and rice husk.

As the global environmental protection trend and resource nationalism in timber resource countries intensify, the reality of Korea, which imports 95% of timber, is experiencing difficulties in supplying raw materials. In addition, research to utilize wood materials, agricultural by-products, non-wood materials and waste resources that have not been used until now due to the reduction of large hardwood trees, deterioration of wood resource quality, and resistance from environmental activists is being greatly promoted worldwide. .

Coconut is an evergreen tree belonging to the palm family. The coconut tree is the only broad palm tree in the genus Cocos, growing up to 30 meters in length, with winged leaves 4 to 6 meters long and small leaves 60 to 90 centimeters long. At the end of their lifespan, the fallen leaves are scattered around the tree, providing nutrients to the tree. Coconut is the fruit of the coconut tree. Coconut trees grow throughout the tropics, and virtually every part of the coconut tree, whether for decoration or cooking, is used by humans. In addition, in some countries, such as Cambodia, coconut shells are very useful as a renewable alternative fuel to replace ordinary trees.

On the other hand, the use of materials using polymer materials (plastics, etc.) and combustible materials is widely expanded throughout the industry. very harmful to

Most of the organic emulsion type flame retardants used until now contain volatile organic compounds (VOC), including formaldehyde, which are harmful to the human body, and have a harmful effect on the human body. For example, in the case of formaldehyde, respiratory failure starts at 0.25 ppm or more, and if it is 30 ppm or more, life may be disrupted. In addition, various VOCs have a harmful effect on the human body.

The invention relates to an aqueous flame retardant prepared by reacting liquid aluminum hydroxide, phosphoric acid, aqueous ammonia, magnesium hydroxide, urea, and the like. However, there is a disadvantage that ammonia water is used to manufacture the aqueous flame retardant and odor is generated during the manufacturing process, and only basic experiments on flame retardant performance have been conducted, but there is no indication of whether harmful substances are released or whether it exhibits deodorizing effect. In addition, since phosphoric acid is used, there is a risk of causing problems such as environmental hormone contamination due to the discharge of phosphorus compounds over a long period of time.

The inorganic flame retardant that has excellent flame retardancy and can effectively absorb noise disclosed in Korean Patent Laid-Open No. 10-2010-0022350 is a flame retardant product including powder rocks, water-soluble resins, water, dispersants and fibers, but these products Due to the lack of dispersion stabilization technology, the storage stability of the product is unstable and it is a product that does not reach the quasi-incombustibility performance.

Therefore, there is an increasing need to develop an eco-friendly and excellent flame retardant product that can solve these problems.

Korean Patent Publication No. 10-2010-0022350

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wood strand board composition comprising coconut husks having increased water resistance and internal strength.

In addition, the present invention relates to a wood strand board composition comprising a water-based inorganic flame-retardant adhesive composition, and more particularly, to a wood strand board composition comprising an environmentally friendly and non-toxic water-based inorganic flame-retardant adhesive composition.

In order to solve the above technical problem, the present invention is coconut shell powder 95 ~ 98% by weight; 1 to 4% by weight of rosin; 0.1 to 1% by weight of diphenylmethane diisocyanate (pMDI); Tea tree oil 0.1 to 0.2% by weight, calcium carbonate 0.1 to 0.2% by weight and 0.5 to 2% by weight of an aqueous inorganic flame-retardant adhesive composition, the aqueous inorganic flame-retardant adhesive composition is sodium silicate (Sodium Silicate) 20 to 30% by weight, 12 to 17% by weight of potassium silicate, 7 to 12% by weight of aluminum silicate, and 3 to 5% by weight of lithium silicate (main base), and inorganic binder 5 to 10 It provides a wood strand board composition comprising weight%, 1 to 2% by weight of an antisettling agent, 1 to 2% by weight of a thixotropic agent, and 40 to 50% by weight of water.

The inorganic binder is SiO ₂ , potassium silicate (Potassium Silicate), silicone-based wetting agent (Wetting Agent), KOH, natural fiber powder, defoaming agent (Defoamer Agent) and water.

The silicone-based wetting agent is characterized in that it is a modified polydimethylsiloxane-based copolymer.

The defoaming agent (Defoamer Agent) is characterized in that at least one of dimethylpolysiloxane (Demethylpolysiloxane) and polyurea (Polyurea).

The antisettling agent is characterized in that at least one of zinc stearate, aluminum stearate, and EDTA.

The thixotropic agent is characterized in that it is bentonite-based or calcium carbonate.

In another embodiment of the present invention, there is provided a wooden strand board manufactured by the composition.

In another embodiment of the present invention, washing the coconut inner shell and drying the water content to 5% or less; finely pulverizing the dried coconut husks to a size of 200 mesh or less; mixing the coconut shell powder with rosin, diphenylmethane diisocyanate (pMDI), tea tree oil, calcium carbonate and an aqueous inorganic flame-retardant adhesive composition; And comprising the step of injection molding the mixture at a temperature of 200 ~ 300 ℃, wherein the mixing step is 95 ~ 98% by weight of coconut shell powder; 1 to 4% by weight of rosin; 0.1 to 1% by weight of diphenylmethane diisocyanate (pMDI); Tea tree oil 0.1-0.2 wt%; It is characterized in that 0.1 to 0.2% by weight of calcium carbonate and 0.5 to 2% by weight of the aqueous inorganic flame retardant adhesive composition are mixed, the aqueous inorganic flame retardant adhesive composition is sodium silicate 20 to 30% by weight, potassium silicate (Potassium) Silicate) 12 to 17% by weight, aluminum silicate (Aluminum Silicate) 7 to 12% by weight, and lithium silicate (Lithum Silicate) 3 to 5% by weight of the main base (main base), and inorganic binder 5 to 10% by weight, precipitation Antisettling agent (Antisettling Agent) 1 to 2% by weight, thixotropic agent (Thixotropic Agent) provides a method for manufacturing a wooden strand board, characterized in that it comprises 1 to 2% by weight and 40 to 50% by weight of water.

The wood strand board manufacturing method is characterized in that it further comprises the step of surface treatment with kraft paper (craft paper) after injection molding.

The wood strand board prepared from the wood strand board composition containing the coconut shell of the present invention is eco-friendly because it does not use a formaldehyde-based resin, and has excellent water resistance and internal strength. In addition, it has aesthetics such as expressing a natural texture, and has excellent antibacterial and odor removal effects, so it can be maintained in a comfortable state for a long time.

In addition, the water-based inorganic flame-retardant adhesive composition included in the wood strand board composition prepared according to the present invention is environmentally friendly and non-toxic.

In addition, according to an embodiment of the present invention, it is possible to prepare an aqueous inorganic flame-retardant adhesive composition having high dispersibility, so that there is no degradation in performance even when stored for a long time, and flame retardancy can be maintained for a long period of time when applied to a product, so that the human body even in case of fire It can reduce the generation of deadly toxic gas.

In addition, according to the present invention, the wood strand board manufactured by the wood strand board composition including the water-based inorganic flame-retardant adhesive composition contains an environmentally friendly inorganic flame-retardant product, so it is eco-friendly and non-toxic, and can exhibit excellent flame retardant performance.

1 is a cross-sectional view of a coconut fruit for explaining the structure of a coconut.
Figure 2 is a photograph confirming the carbonized area as a result of the flame retardant performance of the embodiment of the present invention.
3 is a photograph showing the flame resistance test results of Example (d) and Comparative Example (ac) of the present invention.

Hereinafter, the present invention will be described in more detail through Examples and Experimental Examples. However, these examples are only for helping the understanding of the present invention, and the scope of the present invention is not limited to these examples in any sense.

In one embodiment of the present invention, coconut husk powder; adhesive composition; antifungal agents; Provided is a wood strand board composition comprising a mineral active solvent and an aqueous inorganic flame retardant adhesive composition.

As used herein, the term "coconut inner shell" refers to a hard shell directly enclosing coconut flesh, copra (FIG. 1). Specifically, the coconut husk of the present invention means coconut husk powder.

The present invention collects and recycles the coconut husks removed from the coconut flesh. The coconut husks from which the pulp and coconut hulls have been removed are selected, washed with clean water, and dried so that the moisture content is 5% or less by hot air drying. Then, using a crusher and a fine crusher, the coconut shell is crushed into a fine powder of 200 mesh or less.

The drying process of coconut hulls can be either dried in natural light or in a drying chamber. In general, such as wood used to produce wooden strand boards, it is necessary to dry until the moisture content in the material is reduced to 5% or less. desirable. When the moisture content of the material is high, it generally interferes with the penetration of the adhesive and weakens the adhesive performance, causing the material to be separated from its natural state later. Also, if the moisture content is high, the product will be deformed and mold will be generated at the same time, which may cause spoilage.

Coconut hull fine powder is pulverized to a size of 200 mesh or less. The smaller the pulverized coconut hull fine powder, the better the mechanical properties of synthetic wood by utilizing the nanocrystal structure of the coconut hull. It is easy to discharge carbon dioxide, so fire suppression is improved. Therefore, it is preferable to pulverize the coconut shell fine powder to a size of 200 mesh or less.

The fine coconut shell powder as described above has a nano-needle or nano-plate-like crystal structure and is physically and chemically very stable. , excellent antiseptic and insect repellency.

The coconut shell powder is preferably added in an amount of 95 to 98% by weight based on the total weight of the composition. If the coconut shell powder is used in 95 wt% or less, the durability of the wooden strand board may be reduced, and if 98 wt% or more is used, relatively little adhesive composition is added to reduce the adhesive force, which may cause difficulties in molding. .

Coconut husk itself has a certain amount of cohesive power, so if you add a small amount of adhesive to it, it can be used for putty, adhesive, etc. As the adhesive, a known adhesive, particularly a construction adhesive, may be used, and both organic and inorganic adhesives are possible. As the organic adhesive, natural polymers such as starch and rubber and synthetic polymers such as urea-based, melamine-based, and vinyl acetate-based resins may be used, preferably rubber; carboxymethyl cellulose; vinyl acetate resin; Epoxy resin-based, polyurethane-based; A cyanoacrylate-based adhesive may be used.

In the present invention, the adhesive composition consists of an isocyanate-based resin and rosin.

Isocyanate-based resins combine with lignocellulosic materials, where they have low water absorption, high adhesion and cohesive strength, flexibility in formulation, versatility for curing temperature and speed, excellent structural properties, high water content, and reduce formaldehyde emissions. It is commercially desirable for use in forming some types of composite materials because of its ability to not produce.

In addition, the isocyanate-based resin is an oil-soluble resin obtained by adjusting the viscosity of a reaction product of isocyanate and polyol with an organic solvent, and the isocyanate binder is classified into PMDI (polymeric MDI) and EMDI (emulsifiable MDI). When an isocyanate adhesive with these characteristics is applied to wood, it can be expected to reduce production costs in the wood plate material manufacturing process due to a lower application amount, lower hot-pressing temperature and shorter hot-pressing time compared to other existing adhesives.

The isocyanate component itself is not particularly limited and may be any known in the art. The isocyanate component may be a monomer, a polymer, or a prepolymer. Suitable organic polyisocyanates include, but are not limited to, conventional aliphatic, cycloaliphatic, araliphatic and aromatic isocyanates. In certain embodiments, the isocyanate is selected from the group of diphenylmethane diisocyanate (MDI), polymeric diphenylmethane diisocyanate (pMDI), and combinations thereof, preferably polymeric diphenylmethane diisocyanate (pMDI) .

The isocyanate-based resin is preferably added in an amount of 0.1 to 1% by weight based on the total weight of the composition. When the isocyanate-based resin is used in an amount of 0.1% by weight or less, there may be difficulties in molding due to reduced adhesion, and when it is included in an amount of 1% by weight or more, the durability of the wooden strand board may be reduced.

The rosin is preferably rosin collected from coniferous natural wood. Since the conifer-based natural wood used in the present invention contains more terpenes such as alpha-pinene, beta-pinene, and limonene as active ingredients than hardwood, the rosin extracted therefrom refreshes the hair and exhibits a deodorizing effect. Its strong insect-protecting phytoncide component controls bacterial growth and has a sterilizing effect. The conifer-based natural wood is preferably a woody plant such as pine or pine, and the pine resin is a by-product of conifers such as thinning material, especially after peeling pine nuts from pine nuts, is an active ingredient as described above rather than coniferous wood itself. easy to learn

The rosin is preferably added in an amount of 1 to 4% by weight based on the total weight of the composition. When rosin is used in an amount of 1% by weight or less, there may be difficulties in molding due to reduced adhesion, and when it is included in 4% by weight or more, the durability of the wooden strand board may be reduced.

The antifungal agent is extracted from natural substances and may be added by mixing one or more of orange oil, lemon oil, tea tree oil, magnolia extract, golden extract or magnolia extract. In the present invention, tea tree oil was added. The antifungal agent can be used without limitation as long as it is a natural substance having a termite insect repellent effect.

The tea tree oil is an essential oil extracted from the leaves and twigs of the tea tree, which effectively acts on bacteria, viruses, and fungi and increases immunity. The main chemical component is terpine-4-ol. It is composed of alcohols such as linalool and monoterpenes such as terpinene and pinene. This tea tree oil is effective in relieving respiratory-related symptoms such as cough, bronchitis, and sinusitis, as it has a strong sterilization and anti-catarrhal effect, and is useful for relieving urinary tract infections such as candidiasis and urinary tract infections. .

In the present invention, tea tree oil is used among various antifungal agents, and may be used in an amount of 0.1 to 0.2% by weight.

The mineral active solvent is a reinforcing filler added to improve mechanical, thermal, electrical properties or processability. The mineral active solvent is formulated in a small amount compared to other additives, and in the present invention, 0.1 to 0.2 wt% of a mineral active solvent such as calcium carbonate, talc, and mica may be used among various fillers, and impact strength, bending strength, and heat deformation To improve long-term deformation due to temperature and load, it is selectively used according to the specific use of the synthetic wood.

In particular, calcium carbonate prevents the penetration of moisture and enhances the surface activation effect to increase dimensional stability (prevention of shrinkage change) efficiency, and provides a function to remarkably improve the formability in the manufacture of synthetic wood, and the impact of wooden strand boards. It improves strength, flexural strength, thermal deformation temperature and long-term deformation due to load.

The wood strand board composition according to an embodiment of the present invention includes 0.5 to 2% by weight of the water-based inorganic flame-retardant adhesive composition.

The aqueous inorganic flame-retardant adhesive composition includes 20 to 30% by weight of sodium silicate, 12 to 17% by weight of potassium silicate, 7 to 12% by weight of aluminum silicate and lithium silicate 3 A main base comprising 5 to 5% by weight, 5 to 10% by weight of an inorganic binder, 1 to 2% by weight of an antisettling agent, 1 to 2% by weight of a thixotropic agent, and 40% by weight of water to 50% by weight.

According to one embodiment of the present invention, the aqueous inorganic flame-retardant adhesive composition is sodium silicate (Sodium Silicate) 20 to 30% by weight, potassium silicate (Potassium Silicate) 12 to 17% by weight, aluminum silicate (Aluminum Silicate) 7 to 12% by weight % and a main base comprising 3 to 5% by weight of lithium silicate.

The aqueous inorganic flame-retardant adhesive composition is sodium silicate (SiO ₂ ) and alkali metal compounds Na ₂ O ₃ , Na(OH) ₂ , KOH, LiO and Al(OH) ₃ By combining sodium silicate (Sodium Silicate) 20 to 30 Weight %, potassium silicate (Potassium Silicate) 12 to 17 wt%, aluminum silicate (Aluminum Silicate) 7 to 12 wt%, and lithium silicate (Lithum Silicate) 3 to 5 wt% containing a liquid main base (main base) to be produced can

20 to 30% by weight of the sodium silicate, 12 to 17% by weight of potassium silicate, 7 to 12% by weight of aluminum silicate, and 3 to 5% by weight of lithium silicate The liquid main base may exhibit excellent properties in heat resistance, flame retardancy and corrosion by combining with water.

That is, the aqueous inorganic flame-retardant adhesive composition may have excellent heat resistance, flame retardancy and corrosion properties.

The aqueous inorganic flame-retardant adhesive composition comprises 5 to 10% by weight of an inorganic binder, 1 to 2% by weight of an antisettling agent, 1 to 2% by weight of a thixotropic agent, and 40 to 50% by weight of water. .

The aqueous inorganic flame-retardant adhesive composition includes 5 to 10% by weight of an inorganic binder, and the inorganic binder is SiO ₂ , potassium silicate, silicone-based wetting agent, KOH, natural fiber powder, defoamer agent ) and water.

By including 5 to 10 wt% of the inorganic binder in the aqueous inorganic flame-retardant adhesive composition, adhesion and water resistance may be improved.

When the water-based inorganic flame-retardant adhesive composition contains less than 5% by weight of the inorganic binder, adhesive strength and water resistance may be reduced, and when it exceeds 10% by weight, the content of other components is reduced, heat resistance, flame retardancy, and corrosion are reduced It can be, and there is a problem of difficulty in dispersion.

The silicone-based wetting agent is characterized in that it is a modified polydimethylsiloxane-based copolymer, but is not necessarily limited thereto.

Since the inorganic binder includes a silicone-based wetting agent, stability and fluidity of the aqueous inorganic flame-retardant adhesive composition may be improved.

The defoaming agent (Defoamer Agent) is characterized in that at least one of dimethylpolysiloxane (Demethylpolysiloxane) and polyurea (Polyurea), and the inorganic binder includes the defoaming agent, the effect of preventing the occurrence of bubbles is excellent.

In particular, when the inorganic binder is used by mixing dimethylpolysiloxane and polyurea in a certain ratio, the effect of reducing the occurrence of bubbles of the aqueous inorganic flame-retardant adhesive composition may be more excellent.

The natural fiber powder included in the inorganic binder is not particularly limited, and may be, for example, vegetable fiber including cellulose or animal fiber including protein, and may be used without limitation if it is a natural fiber.

The aqueous inorganic flame-retardant adhesive composition comprises 1 to 2% by weight of an antisettling agent, and the antisettling agent is zinc stearate, aluminum stearate, and EDTA. do it with

By including 1 to 2% by weight of the aqueous inorganic flame-retardant adhesive composition of an antisettling agent, it is possible to prevent precipitation of inorganic substances in the composition.

When the water-based inorganic flame-retardant adhesive composition is included in an amount of less than 1% by weight of an antisettling agent, the effect of preventing precipitation of inorganic substances in the composition may be insignificant, and when it exceeds 2% by weight, the content of other components is relatively small Therefore, heat resistance, flame retardancy, and corrosion properties may be reduced.

The aqueous inorganic flame-retardant adhesive composition comprises 1 to 2 wt% of a thixotropic agent, and the thixotropic agent is characterized in that the bentonite-based or calcium carbonate.

Since the aqueous inorganic flame-retardant adhesive composition contains 1 to 2% by weight of a thixotropic agent, it is possible to prevent inorganic substances from precipitating in the composition.

When the aqueous inorganic flame-retardant adhesive composition is included in an amount of less than 1% by weight of a thixotropic agent, the effect of preventing precipitation of inorganic substances in the composition may be insignificant, and when it exceeds 2% by weight, the content of other components is relatively , so that heat resistance, flame retardancy, and corrosive properties may be reduced.

In particular, the aqueous inorganic flame-retardant adhesive composition is used as a thixotropic agent by mixing a bentonite-based component and calcium carbonate in a 1:1 mixing ratio, thereby providing excellent thixotropic effect.

The aqueous inorganic flame-retardant adhesive composition is sodium silicate (Sodium Silicate) 20 to 30% by weight, potassium silicate (Potassium Silicate) 12 to 17% by weight, aluminum silicate (Aluminum Silicate) 7 to 12% by weight and lithium silicate (Lithum Silicate) 3 A main base comprising 5 to 5% by weight, 5 to 10% by weight of an inorganic binder, 1 to 2% by weight of an antisettling agent, 1 to 2% by weight of a thixotropic agent, and 40% by weight of water To 50% by weight, there is an environmentally friendly and non-toxic effect.

In addition, according to one embodiment of the present invention, since the water-based inorganic flame-retardant adhesive composition has high dispersibility, there is no degradation in performance even when stored for a long time, and when applied to a product, flame retardancy can be maintained for a long period of time, which is fatal to the human body even in case of fire. It can reduce the generation of toxic gas.

The water-based inorganic flame-retardant adhesive composition is preferably added in an amount of 0.5 to 2% by weight based on the total weight of the composition. When the water-based inorganic flame-retardant adhesive composition is used in an amount of 0.5 wt% or less, the flame retardant effect cannot be properly exhibited, and when 2 wt% or more is included, the durability of the wooden strand board may be reduced.

In another embodiment of the present invention, there is provided a wooden strand board manufactured using the composition. In addition, the wooden strand board may be surface-hardened with craft paper, and surface abrasion properties are improved when the surface is treated with graft paper.

According to the present invention, the wooden strand board including the water-based inorganic flame-retardant adhesive composition is eco-friendly and non-toxic, and can exhibit excellent flame-retardant performance.

On the other hand, in another embodiment of the present invention, washing the coconut inner shell and drying the water content to 5% or less; finely pulverizing the dried coconut husks to a size of 200 mesh or less; mixing the coconut shell powder with rosin, diphenylmethane diisocyanate (pMDI), tea tree oil, calcium carbonate and an aqueous inorganic flame-retardant adhesive composition; And comprising the step of injection molding the mixture at a temperature of 200 ~ 300 ℃, wherein the mixing step is 95 ~ 98% by weight of coconut shell powder; 1 to 4% by weight of rosin; 0.1 to 1% by weight of diphenylmethane diisocyanate (pMDI); Tea tree oil 0.1-0.2 wt%; It is characterized in that 0.1 to 0.2% by weight of calcium carbonate and 0.5 to 2% by weight of the aqueous inorganic flame retardant adhesive composition are mixed, the aqueous inorganic flame retardant adhesive composition is sodium silicate 20 to 30% by weight, potassium silicate (Potassium) Silicate) 12 to 17% by weight, aluminum silicate (Aluminum Silicate) 7 to 12% by weight, and lithium silicate (Lithum Silicate) 3 to 5% by weight of the main base (main base), and inorganic binder 5 to 10% by weight, precipitation Antisettling agent (Antisettling Agent) 1 to 2% by weight, thixotropic agent (Thixotropic Agent) provides a method for manufacturing a wooden strand board, characterized in that it comprises 1 to 2% by weight and 40 to 50% by weight of water.

Hereinafter, the present invention will be described in more detail through Examples and Experimental Examples. However, these examples are only for helping the understanding of the present invention, and the scope of the present invention is not limited to these examples in any sense.

Examples 1-4

In Examples 1 to 4 of the present invention, wooden strand boards were manufactured using the water-based inorganic flame-retardant adhesive composition according to an embodiment of the present invention.

Specifically, the aqueous inorganic flame-retardant adhesive composition used in this embodiment is sodium silicate (Sodium Silicate) 20% by weight, potassium silicate (Potassium Silicate) 15% by weight, aluminum silicate (Aluminum Silicate) 7% by weight and lithium silicate (Lithum) Silicate) 3% by weight, inorganic binder 10% by weight, antisettling agent 1% by weight, thixotropic agent 2% by weight and 42% by weight of water were prepared.

The wood strand board, which is an embodiment of the present invention, has a specific gravity and a content of an aqueous inorganic flame-retardant adhesive composition of 0.6 g/cm ³ , 30% by weight (Example 1), 0.5 g/cm ³ , 30% by weight (Example 2), respectively 0.4 g/cm ³ , 30 wt% (Example 3) and 0.5 g/cm ³ , 50 wt% (Example 4) were prepared.

The flame-retardant performance was tested for Examples 1 to 4, and the test was performed using a 45° angle tester (Flammability tester). For the method of irradiating the carbonization area, the OHP film on which the carbonization interface was drawn was placed on a flat floor and the area was measured using a planimeter.

The flame-retardant performance test results are shown in Table 1 below.

Referring to Table 1, the flame-retardant performance results of the wood of Examples 1 to 4 prepared using the water-based inorganic flame-retardant adhesive composition were all 8 cm or less in carbonization length, no remaining flame, and 22.1 cm ³ or less in carbonization area. It can be seen that the excellent flame retardant performance is shown.

In particular, in the case of wood (Example 4) prepared by including the water-based inorganic flame-retardant adhesive composition in an amount of 50% by weight, the carbonized area was 15.3 cm ³ , indicating excellent flame retardant performance.

<Example 5>

The inner skin of the coconut from which the flesh has been removed is collected, placed in a net, and clean water is sprayed at high pressure to sufficiently remove impurities adhering to the inner skin of the coconut. After washing the washed coconut shells by hot air drying at 200°C to reduce the moisture content to 5% or less, finely pulverize the dried coconut shells to a size of 200 mesh or less using a crusher, ball mill, roll mill, or attritor, etc. do.

As shown in the following [Table 2], the raw materials are mixed and extruded or injection molded at a temperature range of 200 to 300° C. to prepare a wooden strand board. At this time, for dimensional stability of the composite wood, it is cooled with water at a constant temperature.

Raw material Coconut Peel Powder rosin pMDI tea tree oil calcium carbonate Inorganic flame retardant adhesive composition content
(weight%) 97 2.1 0.2 0.1 0.1 0.5

<Comparative Example 1>

A wooden strand board was prepared in the same manner as in Example 1, except for coconut husk powder, using commercially available wood flour (a by-product generated during wood processing).

<Comparative Example 2>

A wooden strand board was prepared in the same manner as in Example 1, except for pMDI, using PP (polypropylene).

<Experimental example>

The maximum bending load, impact strength, screw holding force, moisture absorption rate and slip resistance were measured for the prepared wooden strand board, and the results are shown in Table 3.

Test Items Example 5 Comparative Example 1 Comparative Example 2 Flexural load (N) 5200 3800 4500 Impact strength (KJ/㎡) 4.8 3.5 3.8 Screw holding force (N) 1600 1000 1200 water absorption rate 1.5 3 1.3 Slip resistance (C.S.R) 1.2 0.8 1.1

As a result of the experiment, Example 5 showed the highest values for maximum flexural load, impact strength, and screw retention, and it was confirmed that it was superior to Comparative Example 1 using commercially available wood flour except for coconut shell powder in all test items. .

On the other hand, when PP (polypropylene) was used except for pMDI (Comparative Example 2), the results showed that the maximum flexural load, impact strength and screw holding force were lowered compared to Example 5, and according to the experimental results, coconut shells It was found that using pMDI is more effective than using a general polymer resin in the case of manufacturing wood strand board using powder.

Figure 2 is a photograph confirming the carbonized area as a result of the flame retardant performance of the embodiment of the present invention.

Referring to FIG. 2 , it can be seen that the flame retardant performance results of the wood strand boards of Examples 1 to 4 produced using the aqueous inorganic flame retardant adhesive composition according to an embodiment of the present invention exhibit excellent flame retardant performance.

3 is a photograph showing the flame resistance test results of Examples ((d)) and Comparative Examples ((a)-(c)) of the present invention.

Referring to FIG. 3, in the case of wood (Lumber) ((d)) prepared using a wood strand board composition comprising an aqueous inorganic flame retardant adhesive composition according to an embodiment of the present invention, Comparative Examples ((a)-(c)) In comparison, it can be seen that the flame resistance is excellent and the flame retardant performance is excellent.

In FIG. 3 , each of Comparative Examples used medium-density fiberboard (M.D.F) ((a)), Hard Wood ((b)), and log ((c)).

The present invention described above is not limited to the above-described embodiment because various substitutions and changes can be made to those of ordinary skill in the art to which the present invention pertains without departing from the technical spirit of the present invention. .

Claims (9)

95 to 98% by weight of coconut hull powder; 1 to 4% by weight of rosin; 0.1 to 1% by weight of diphenylmethane diisocyanate (pMDI); It contains 0.1 to 0.2 wt% of tea tree oil, 0.1 to 0.2 wt% of calcium carbonate, and 0.5 to 2 wt% of an aqueous inorganic flame-retardant adhesive composition,
The aqueous inorganic flame-retardant adhesive composition includes 20 to 30% by weight of sodium silicate, 12 to 17% by weight of potassium silicate, 7 to 12% by weight of aluminum silicate and lithium silicate 3 A main base comprising to 5% by weight, and
5 to 10% by weight of an inorganic binder, 1 to 2% by weight of an antisettling agent, 1 to 2% by weight of a thixotropic agent, and 40 to 50% by weight of water. composition.
According to claim 1,
The inorganic binder is SiO ₂ , potassium silicate (Potassium Silicate), silicone-based wetting agent (Wetting Agent), KOH, natural fiber powder, defoaming agent (Defoamer Agent) and water, characterized in that it comprises,
Wood strand board composition.
3. The method of claim 2,
The silicone-based wetting agent (Wetting Agent) is characterized in that the modified polydimethyl siloxane-based copolymer,
Wood strand board composition.
3. The method of claim 2,
The defoaming agent (Defoamer Agent) is characterized in that at least one of dimethylpolysiloxane (Demethylpolysiloxane) and polyurea (Polyurea),
Wood strand board composition.
According to claim 1,
The antisettling agent is characterized in that at least one of zinc stearate (Zinc Stearate), aluminum stearate (Aluminium Stearate) and EDTA,
Wood strand board composition.
According to claim 1,
The thixotropic agent is characterized in that the bentonite-based or calcium carbonate,
Wood strand board composition.
A wooden strand board produced by the composition according to any one of claims 1 to 6.
Washing the inner skin of the coconut and drying it so that the moisture content is 5% or less;
finely pulverizing the dried coconut husks to a size of 200 mesh or less;
mixing the coconut shell powder with rosin, diphenylmethane diisocyanate (pMDI), tea tree oil, calcium carbonate and an aqueous inorganic flame retardant adhesive composition; and
Comprising the step of injection molding the mixture at a temperature of 200 ~ 300 ℃,
The mixing step is 95 to 98% by weight of coconut shell powder; 1 to 4% by weight of rosin; 0.1 to 1% by weight of diphenylmethane diisocyanate (pMDI); Tea tree oil 0.1-0.2 wt%; It is characterized in that 0.1 to 0.2% by weight of calcium carbonate and 0.5 to 2% by weight of an aqueous inorganic flame-retardant adhesive composition are mixed,
The aqueous inorganic flame-retardant adhesive composition includes 20 to 30% by weight of sodium silicate, 12 to 17% by weight of potassium silicate, 7 to 12% by weight of aluminum silicate and lithium silicate 3 A main base comprising to 5% by weight, and
5 to 10% by weight of an inorganic binder, 1 to 2% by weight of an antisettling agent, 1 to 2% by weight of a thixotropic agent, and 40 to 50% by weight of water. manufacturing method.
9. The method of claim 8,
Wood strand board manufacturing method, characterized in that it further comprises the step of surface treatment with kraft paper (craft paper) after injection molding.

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