KR20210012784A - Wood strand board composition comprising coconut shell and wood strand board manufactured by the same - Google Patents

Abstract

The present invention relates to a wood strand board composition including a coconut shell and a wood strand board manufactured thereby. More specifically, the wood strand board composition comprises coconut shell powder, an adhesive composition, an antifungal agent, and a mineral active solvent. According to the present invention, the wood strand board composition including a coconut shell does not use a formaldehyde-based resin, thereby being environmentally friendly and providing excellent waterproofness and internal strength. Moreover, the wood strand board composition provides decorative properties, such as expression of natural texture and the like, and has excellent antifungal and deodorization effects to maintain a pleasant state for a long period, thereby providing an advantage of being variously utilized as a pavement material, an interior material, and the like.

Description

A wood strand board composition comprising a coconut inner shell, and a wood strand board manufactured thereby TECHNICAL FIELD [0001]

The present invention relates to a wood strand board composition comprising a coconut inner shell and a wood strand board manufactured thereby, specifically, a coconut inner shell powder; Adhesive composition; It provides a wood strand board composition comprising an antifungal agent and a mineral active solvent, and a wood strand board manufactured thereby.

Countries that depend on imports of timber due to the expansion of global resource protectionism and the destruction of tropical forests are experiencing difficulties in the supply and demand of timber, and a new paradigm of sustainable forest management and resource recycling is becoming more common. For example, in Indonesia, which supplies tropical timber to us, out of 119.7 million hectares of natural forests, forests devastated due to slaughter and conglomeration are 42.26 million hectares. Since it is no longer possible to produce logs, the Indonesian government is in a hurry to implement the Forest Restoration Act next year. In Korea, even though 65% is forest, 95% of wood and wood products are imported, which is pointed out as the biggest difficulty in the domestic timber industry. Therefore, the immediate control of the domestic timber industry, which is in the position of an absolute poor country for timber and wood material raw materials, is a position to seek the development of domestic wood substitutes, fostering of local resources, and efficient use of resources.

The demand for the need for substitutes for timber resources is already recognized as a worldwide problem, and representative of such substitutes include bamboo, kenaf, sisal, and rice husk.

With the global environmental protection trend and the growing nationalism of resources in timber resource countries, the domestic reality as an importing country that imports 95% of timber is having difficulties in supply and demand of raw materials. In addition, research to utilize woody materials, agricultural by-products, non-woody materials and waste resources that have not been used until now due to the decrease of large hardwoods, deterioration of the quality of wood resources, and resistance of 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 cocos that grows up to 30 meters in size, with 4-6 meters long wing-shaped leaves and each small leaf 60 to 90 cm long. Leaves that have died at the end of their life are scattered around the tree to nourish the tree. Coconut means the fruit of the coconut tree. Coconut trees grow throughout the tropics, and virtually every part of the coconut tree, including decoration and 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.

Korean Patent Registration No. 10-1105171

It is an object of the present invention to provide a wood strand board composition comprising a coconut inner shell having increased water resistance and internal strength.

In order to achieve the object of the present invention, the present invention is a coconut inner shell powder; Adhesive composition; It provides a wood strand board composition comprising an antifungal agent and a mineral active solvent.

The adhesive composition includes isocyanate and rosin, and the isocyanate is preferably polymeric diphenylmethane diisocyanate (pMDI).

In another embodiment of the present invention, the wood strand board composition may further include a phosphorus-based flame retardant, and the phosphorus-based flame retardant is RDXP (resorcinolbis (di2,6-xylenyl phosphate)), DPP (ani Linodiphenyl phosphate), RDPP (resorcinolbis (diphenyl phosphate)), and TPPO (triphenylphosphine oxide), but is not limited thereto.

The mineral active solvent is calcium carbonate, and the antifungal agent may include any one of orange oil, lemon oil, tea tree oil, magnolia extract, golden extract, or magnolia extract, but is not limited thereto, and preferably tea tree oil to be.

In another embodiment of the present invention, coconut inner shell powder; Diphenylmethane diisocyanate (pMDI); Rosin; It provides a wood strand board composition comprising tea tree oil and calcium carbonate. More specifically, 95 to 98% by weight of coconut inner shell powder; 1-4% by weight of rosin; Diphenylmethane diisocyanate (pMDI) 0.1 to 1% by weight; Provides a wood strand board composition comprising 0.1 to 0.2% by weight of tea tree oil and 0.1 to 0.2% by weight of calcium carbonate, wherein the composition further includes 0.5 to 1% by weight of DPP (anilinodiphenyl phosphate) can do.

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

In another embodiment of the present invention, washing the inner shell of the coconut and drying it so that the moisture content is less than 5%; Pulverizing the dried coconut inner shell to a size of 200 mesh or less; Mixing the coconut inner shell powder with rosin, diphenylmethane diisocyanate (pMDI), tea tree oil, and calcium carbonate; And the method of manufacturing a wooden strand board comprising the step of injection molding the mixture at a temperature of 200 ~ 300 ℃ It provides, and may further include the step of surface treatment with kraft paper (craft paper) after injection molding.

In addition, the mixing step is 95 to 98% by weight of coconut inner shell powder; 1-4% by weight of rosin; Diphenylmethane diisocyanate (pMDI) 0.1 to 1% by weight; 0.1 to 0.2% by weight of tea tree oil and 0.1 to 0.2% by weight of calcium carbonate are mixed, and the mixture may further include 0.5 to 1% by weight of DPP (anilinodiphenyl phosphate).

The wood strand board made of the wood strand board composition including the coconut inner shell of the present invention is eco-friendly and has excellent water resistance and internal strength because no formaldehyde-based resin is used. In addition, it has aesthetics such as expressing a natural texture, and has excellent antibacterial and odor removal effects, so that it can maintain a comfortable state for a long time, so it has the advantage that it can be used in various ways as road paving materials and interior materials for interiors.

1 is a cross-sectional view of a coconut fruit for explaining the structure of the coconut.

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 inner shell powder; Adhesive composition; It provides a wood strand board composition comprising an antifungal agent and a mineral active solvent.

The term "coconut inner shell" used in the present invention refers to a hard shell directly surrounding copra, which is a coconut flesh (Fig. 1). Specifically, the coconut inner shell of the present invention means a coconut inner shell powder.

The present invention collects and recycles the coconut inner shells removed from the coconut flesh, and the coconut inner shells from which the flesh and coconut outer shells are removed are sorted, washed with clean water, and dried to a moisture content of 5% or less by hot air drying. Then, the inner shell of the coconut is pulverized into fine powder of 200 mesh or less using a crusher and a pulverizer.

The drying process of the coconut shell can be dried in natural light or in a drying chamber. In general, it is necessary to dry it until the moisture content in the material is reduced to 5% or less, such as the wood used to produce wood strand boards. desirable. If the moisture content of the material increases, it generally interferes with the penetration of the adhesive and weakens the adhesive performance, causing the material to separate from its natural state later. If the moisture content is high, the weight of the material increases and excessive load occurs when the product is produced. Also, if the moisture content is high, the product may be deformed and mold may occur at the same time, causing spoilage.

Coconut inner shell fine powder is pulverized to a size of 200 mesh or less, and the smaller the coconut inner shell fine powder is crushed, the better the mechanical properties of synthetic wood by utilizing the nanocrystal structure of the coconut inner shell. Ease of carbon dioxide emission improves fire suppression. Therefore, it is preferable to pulverize the coconut inner shell fine powder to a size of 200 mesh or less.

The above-described fine coconut shell powder has a nano acicular or nano plate-like crystal structure, and is physically and chemically very stable, so the wood strand board manufactured using the coconut inner shell fine powder has high mechanical strength, durability, and moisture resistance. , Excellent antiseptic and insect repellency.

The coconut inner 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 inner shell powder is used in an amount of 95% by weight or less, the durability of the wooden strand board may be reduced, and in the case of using more than 98% by weight, a relatively small amount of the adhesive composition is added and the adhesion is reduced, which may cause difficulty in molding. .

The inner shell of the coconut itself has some degree of cohesion, 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, in particular, an adhesive for construction may be used, and both organic and inorganic adhesives may be used. As the organic adhesive, natural polymers such as starch and rubber and synthetic polymers such as urea, melamine, and vinyl acetate resin may be used, preferably rubber; Carboxymethylcellulose; Vinyl acetate resin system; Epoxy resin-based, polyurethane-based; Cyanoacrylate-based adhesives can be used.

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

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

In addition, isocyanate-based resins are oil-soluble resins obtained by adjusting the viscosity of the reaction product of isocyanate and polyol with an organic solvent, and isocyanate binders are divided into PMDI (polymeric MDI) and EMDI (emulsifiable MDI). When the isocyanate adhesive having such characteristics is applied to wood, it can be expected to reduce the production cost in the manufacturing process of woody boards due to a lower application amount, lower heat pressure temperature and reduction of heat pressure time compared to other existing adhesives.

The isocyanate component itself is not particularly limited, and may be any known in the related art. The isocyanate component can be a monomer, polymer, or 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). .

It is preferable that the isocyanate-based resin is added in an amount of 1 to 4% by weight based on the total weight of the composition. When the isocyanate-based resin is used in an amount of 1% by weight or less, the adhesive strength may be reduced, and thus molding may be difficult. When it is included in an amount of 4% by weight or more, the durability of the wood strand board may be reduced.

It is preferable that the resin is a pine resin obtained from natural coniferous wood. Since the softwood-based natural wood used in the present invention contains more terpenes, such as alpha-pinene, beta-pinene, and limonene, as active ingredients than hard-leaved trees, the rosin extracted therefrom makes hair refreshing and exhibits a deodorizing effect. The strong pest defense phytoncide component controls bacterial growth and exhibits bactericidal effect. The coniferous natural wood is preferably a woody plant such as pine or pine, and the rosin is a thinning material, in particular, after the pine nuts are shelled from pine pine, the by-product of coniferous trees, such as a by-product, is made from the above-described active ingredient rather than the coniferous wood itself. It is easy to learn.

The rosin is preferably added in an amount of 0.1 to 1% by weight based on the total weight of the composition. If the resin is used in an amount of 0.1% by weight or less, it may be difficult to form because the adhesion is reduced, and if it is contained in an amount of 1% by weight or more, the durability of the wood strand board may be reduced.

The antifungal agent is extracted from a natural substance 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 repellent effect.

The tea tree oil is an essential oil extracted from the leaves and twigs of tea tree. It is an oil that effectively acts on bacteria, viruses, and fungi and increases immunity. The main chemical component is terpine-4-ol. , Linalool (linalool), such as alcohol, terpinene (terpinene), pinene (pinene) is composed of a monoterpene type. This tea tree oil is effective in relieving respiratory symptoms such as cough, bronchitis, sinusitis, etc., and is useful in relieving urinary infection symptoms such as candidiasis and urinary tract infections. .

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

In particular, calcium carbonate prevents the penetration of moisture, increases the surface activation effect, and provides the function of improving the dimensional stability (prevention of shrinkage change) efficiency, and the function of remarkably improving the formability during the manufacture of synthetic wood, and the impact of the wooden strand board. It improves strength, bending strength, heat deflection temperature and long term deformation due to load.

It is preferable to use a flame retardant containing at least one or more of a phosphorus flame retardant or an inorganic flame retardant.

The inorganic flame retardant includes aluminum hydroxide, antimony oxide, magnesium hydroxide, zinc stannate, molybdate, guanidine, zirconium, and the like. Among these, aluminum hydroxide is non-toxic, low-smokeability, excellent electrical insulation, and low cost, but can be applied only to products with a low processing temperature of 180 to 220°C, and a large amount must be applied to impart flame retardancy. Therefore, the mechanical properties and workability of the wood strand board may be deteriorated.

In the present invention, phosphorus-based flame retardants are mainly used among the above flame retardants, and phosphorus-based flame retardants are phosphorus compounds such as RDXP (resorcinolbis (di2,6-xylenylphosphate)), DPP (anilinodiphenyl phosphate), RDPP (reso It may contain at least one or more of lecinolbis (diphenyl phosphate)) and TPPO (triphenylphosphine oxide), and preferably includes DPP (anilinodiphenyl phosphate).

The flame retardant is preferably added in an amount of 0.5 to 1% by weight based on the total weight of the composition. When the flame retardant is used in an amount of 0.5% by weight or less, the flame-retardant effect cannot be properly exhibited, and when it is contained in an amount of 1% by weight or more, the durability of the wood strand board may be reduced.

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

Hereinafter, the present invention will be described in more detail through examples according to an embodiment of the present invention, but these do not limit the scope of the present invention.

<Example 1>

The coconut inner shell from which the pulp has been removed is collected and placed in a mesh net, and clean water is sprayed with high pressure to sufficiently remove the impurities fixed to the coconut inner shell. After drying the washed coconut inner shell with hot air at 200℃ so that the moisture content is less than 5%, the dried coconut inner shell is pulverized into smaller sizes of 200 mesh or less using a pulverizer such as a crusher, ball mill, roll mill, and artliter. do.

As shown in [Table 1] below, raw materials are mixed and extruded or injection-molded at a temperature range of 200 to 300°C to manufacture a wooden strand board. At this time, the synthetic wood is cooled with water at a constant temperature for dimensional stability.

Raw material Coconut husk powder Rosin pMDI Tea tree oil Calcium carbonate content
(weight%) 97 2.4 0.4 0.1 0.1

<Example 2>

In Example 1, 2.3 wt% of rosin was added, and 0.1 wt% of DPP (anilinodiphenyl phosphate) was further added to prepare a wood strand board in the same manner as in Example 1.

<Comparative Example 1>

A wood strand board was manufactured in the same manner as in Example 1, but using commercially available wood flour (a by-product generated during wood processing) excluding the coconut inner shell powder.

<Comparative Example 2>

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

<Experimental Example>

The maximum flexural load, impact strength, screw retention force, moisture absorption rate, and sliding resistance were measured for the prepared wooden strand board, and the results are shown in Table 2.

Test Items Example 1 Example 2 Comparative Example 1 Comparative Example 2 Flexural load (N) 5200 5100 3800 4500 Impact strength (KJ/㎡) 4.8 4.8 3.5 3.8 Screw retention force (N) 1600 1520 1000 1200 Moisture absorption rate 1.5 1.6 3 1.3 Sliding resistance (C.S.R) 1.2 1.3 0.8 1.1

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

When 0.1% by weight of DPP (anilinodiphenyl phosphate), which is a flame retardant, is added in Example 2, it can be confirmed that it has similar physical properties compared to Example 1.

However, in the case of using PP (polypropylene) excluding pMDI (Comparative Example 2), the maximum flexural load, impact strength, and screw retention power were lowered compared to Example 1. According to the experimental results, coconut inner shell powder In the case of manufacturing a wood strand board by using pMDI, it was found that it is more effective than using a general polymer resin.

Claims (14)

Coconut husk powder; Adhesive composition; A wood strand board composition comprising an antifungal agent and a mineral active solvent.
The method of claim 1,
The adhesive composition is a wood strand board composition, characterized in that it comprises an isocyanate and rosin.
The method of claim 2,
The isocyanate is a wooden strand board composition, characterized in that the polymeric diphenylmethane diisocyanate (pMDI).
The method of claim 1,
Wood strand board composition, characterized in that the composition further comprises a phosphorus-based flame retardant.
The method of claim 4,
The phosphorus-based flame retardant is RDXP (resorcinolbis (di2,6-xylenyl phosphate)), DPP (anilinodiphenyl phosphate), RDPP (resorcinolbis (diphenyl phosphate)), TPPO (triphenyl phosphate) Pin oxide) wood strand board composition, characterized in that it comprises one or more.
The method of claim 1,
The antifungal agent is a wooden strand board composition, characterized in that any one of orange oil, lemon oil, tea tree oil, magnolia extract, golden extract or magnolia extract.
The method of claim 1,
Wood strand board composition, characterized in that the mineral active solvent is calcium carbonate.
Coconut shell powder; Diphenylmethane diisocyanate (pMDI); Rosin; A wood strand board composition comprising tea tree oil and calcium carbonate.
The method of claim 8,
95 to 98% by weight of coconut shell powder; 1-4% by weight of rosin; Diphenylmethane diisocyanate (pMDI) 0.1 to 1% by weight; A wood strand board composition comprising 0.1 to 0.2% by weight of tea tree oil and 0.1 to 0.2% by weight of calcium carbonate.
The method of claim 9,
DPP (anilinodiphenyl phosphate) 0.5 to 1% by weight of a wood strand composition further comprising.
A wood strand produced by the composition of any one of claims 1 to 10.
Washing the inner shell of the coconut and drying it so that the moisture content is less than 5%;
Pulverizing the dried coconut inner shell to a size of 200 mesh or less;
Mixing the coconut inner shell powder with rosin, diphenylmethane diisocyanate (pMDI), tea tree oil, and calcium carbonate; And
Wood strand board manufacturing method comprising the step of injection molding the mixture at a temperature of 200 ~ 300 ℃.
The method of claim 12,
Wood strand board manufacturing method, characterized in that it further comprises the step of surface treatment with kraft paper (craft paper) after injection molding.
The method of claim 12,
The mixing step is 95 to 98% by weight of coconut inner shell powder; 1-4% by weight of rosin; Diphenylmethane diisocyanate (pMDI) 0.1 to 1% by weight; Tea tree oil 0.1 to 0.2% by weight and calcium carbonate 0.1 to 0.2% by weight of a wood strand board manufacturing method, characterized in that mixing.

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