JP5283181B2 - Method for producing wall greening board containing crushed bark - Google Patents

Description

The present invention relates to a method for manufacturing a wall surface greening board , comprising mixing a bark pulverized product subjected to surface activation treatment with a surface active treatment substance and a resin emulsion, followed by pressure molding.

  In recent years, greening of various places such as building roofs, verandas, slope slopes, and athletic fields has been desired, and various vegetation platforms have been proposed. However, when a wooden board, which is a molded product obtained by combining small pieces of wood waste material, is used as a vegetation base, it is insufficient in decay resistance, and it has been difficult to maintain a form for a long time while maintaining vegetation. Therefore, there has been a demand for a molded article that has both excellent water absorption and decay resistance and can maintain its form over a long period of time when used as a vegetation base.

  Patent Document 1 discloses a pressure-molded product obtained by bonding small pieces of material with a thermoplastic resin, the pressure molding temperature T (° C.) of the small pieces of material and the glass transition temperature Tg (° C.) of the thermoplastic resin. However, Tg + 80 ≧ T ≧ Tg + 5 is described. It is described that a woody material derived from wood such as wood pieces, wood fibers, and bark is preferably used as the piece-like material. Further, it is also described that vinyl acetate resin, ethylene-vinyl acetate copolymer resin, acrylic resin and styrene-butadiene copolymer are used as the thermoplastic resin. In addition, a method for producing the molded article using such resin emulsion or latex is also described. Patent Document 2 describes a vegetation material containing seeds or agricultural additives in a molded product similar to Patent Document 1. However, it has not been possible to combine water absorption and decay resistance at a high level.

  Patent Document 3 describes a plant cultivation greening material characterized in that combustion ash is blended with a perishable natural bark and fiber. By adding combustion ash to bark fibers with strong water repellency, the hydrophobicity of the bark can be easily changed to a hydrophilic surface, so that water can be wetted well without water repellency, and water necessary for plant growth can be retained. And it is described that the said greening material is used as soil for plant cultivation, soil improvement material, spraying material, and mulch material. However, it does not describe a molded product using the greening material.

JP 2002-254457 A JP 2005-160447 A Japanese Patent Laid-Open No. 10-174518

This invention is made | formed in order to solve the said subject, and it aims at providing the manufacturing method of the wall surface greening board which has the outstanding water absorption and decay resistance.

The above problem is that the bark pulverized product (A) subjected to the surface activation treatment with the surface active treatment material (B) having a cation substitution capacity of 50 meq / 100 g or more and the resin emulsion (C) are mixed, and then the reinforcing plate It is solved by providing a method for producing a wall greening board , characterized in that a molded product having a reinforcing plate on one side is formed by pressure molding.

At this time, it is preferable that the surface active treatment substance (B) is at least one selected from the group consisting of clay, silt, activated carbon powder, combustion ash, diatomaceous earth, and Kanuma earth. It is also preferred that the surface active treatment substance (B) has an average weight diameter of 0.1 to 350 μm. The resin emulsion (C) is preferably an aqueous emulsion having a dispersoid of a thermoplastic resin obtained by polymerizing a monomer having a carbon-carbon double bond with polyvinyl alcohol as a dispersant. The dispersoid of (C) is more preferably an ethylene-vinyl acetate copolymer. It is also preferable to mix 2 to 80 parts by weight of the surface active treatment substance (B) with respect to a total of 100 parts by weight of the bark pulverized product (A) and the surface active treatment substance (B). It is also preferable to mix the resin emulsion (C) so that the solid content is 10 to 60 parts by weight with respect to 100 parts by weight of the bark pulverized product (A) and the surface-active substance (B). It is also preferable that the density of the molded product is 0.2 to 0.8 g / cm ³ .

According to the manufacturing method of the green wall board of the present invention, it is possible to wall greening board having both excellent water absorption and Decay resistance, producing with good productivity. In addition, since the production method of the present invention does not generate formaldehyde as in the case of curing a general wood board with a thermosetting resin, the problem on safety and hygiene is solved .

It is a photograph of the molded product immediately after planting a plant seedling in Example 2 . The kind and position of the plant seedling planted in Example 2 are shown. It is a photograph of the molded product 61 days after planting a plant seedling in Example 2 .

  In the method for producing a molded article of the present invention, the bark pulverized product (A) subjected to the surface active treatment with the surface active treatment substance (B) and the resin emulsion (C) are mixed and then pressure-molded. .

  The bark pulverized product (A) used in the present invention is not particularly limited as long as it is obtained by pulverizing bark. By using such a bark pulverized product (A), a molded product which does not easily rot can be obtained. Examples of the bark pulverized product (A) include those obtained by pulverizing the bark of cedar, cypress, pine, hiba, eucalyptus, coconut shell, lawan, capol, poplar, willow, orchid, or cyclamen. Among these, cedar or cypress is preferable because it can be easily obtained as a waste of the lumbering process and a molded product having excellent durability and strength can be obtained.

  Examples of the method for crushing bark include a crushing method using a hammer mill, a knife mill, or the like. The size of the bark pulverized product (A) is not particularly limited, but 80% by weight or more of the bark pulverized product (A) is preferably composed of particles having a length of 100 mm or less, a width of 10 mm or less, and a thickness of 5 mm or less. If the proportion of particles having such a size is less than 80% by weight of the bark pulverized product (A), the bark pulverized product (A) may not be easily mixed with the surface-active substance (B). More preferably, 80% by weight or more of the bark pulverized product (A) is composed of particles having a length of 70 mm or less, a width of 7 mm or less and a thickness of 3 mm or less, and a particle having a length of 50 mm or less, a width of 5 mm or less and a thickness of 1 mm or less. More preferably, it consists of. Further, 80% by weight or more of the bark pulverized product (A) is preferably composed of particles having a length of 3 mm or more. When the proportion of particles having a length of 3 mm or more is less than 80% by weight of the bark pulverized product (A), the strength of the obtained molded product is lowered. More preferably, 80% by weight or more of the bark pulverized product (A) is composed of particles having a length of 5 mm or more. As the bark pulverized product (A), one using one type of bark or one using a plurality of types of bark may be used.

  In the method for producing a molded article of the present invention, the surface-active substance (B) is used in addition to the bark pulverized product (A) and the resin emulsion (C). In the present invention, it is important that the surface active treatment substance (B) has a cation substitution capacity of 50 meq / 100 g or more. By subjecting the bark pulverized product (A) to surface activation treatment using the surface active treatment material (B) having a cation substitution capacity of 50 meq / 100 g or more, the water absorption of the molded product obtained is greatly improved. This is considered to be because such a surface-active substance (B) changes the surface of the bark pulverized product (A) from hydrophobic to hydrophilic. Moreover, the decay resistance of the obtained molded article becomes favorable by using the surface active treatment substance (B). The bark pulverized product (A) is not easily spoiled due to its natural bactericidal and insecticidal properties. However, the addition of the surface-active treatment substance (B) greatly improves the decay resistance of the obtained molded product. That is, a surprising effect of improving the decay resistance while improving the water absorption is achieved. In addition, the addition of the surface active treatment substance (B) also improves the flame retardancy of the resulting molded product.

  The cation substitution capacity of the surface active treatment substance (B) is preferably 100 meq / 100 g or more, and more preferably 150 meq / 100 g or more. The cation substitution capacity is a value measured by the semi-micro Schollenberger method. That is, after exchanging the exchangeable cation of the surface-active substance (B) with ammonium ion using an ammonium acetate solution or the like and then removing excess ammonium acetate with alcohol, a sodium chloride solution or the like is then removed. It can be determined by extracting ammonium ions and quantifying the ammonium ions.

  As the surface active treatment substance (B) used in the present invention, clay, silt, activated carbon powder, combustion ash, diatomaceous earth, Kanuma earth, and the like are preferably used. Among these, the combustion ash is an ash formed when an object is burned, and examples include coal combustion ash, wood combustion ash, and oil combustion ash. Among them, wood combustion ash is preferable from the viewpoint of safety. One type of surface active treatment substance (B) may be used, or a plurality of types may be used.

The size of the surface active treatment substance (B) is not particularly limited as long as the molded product can be molded, and the average weight diameter is preferably 0.1 to 350 μm. If the average weight diameter is less than 0.1 μm, dust may be generated during the production of the molded product. The diameter is more preferably 0.5 μm or more, and further preferably 1 μm or more. If the average weight diameter exceeds 350 μm, the strength of the molded product may be lowered. The diameter is more preferably 300 μm or less, and further preferably 250 μm or less. Here, the average weight diameter is a value calculated by the following equation from the particle size distribution measured by the Andreazen pipette method according to JIS Z8820-2.
Average weight diameter = Σnd ⁴ / Σnd ³
n: number of particles d: diameter of particles

  The resin emulsion (C) used in the present invention is one in which the resin constituting the dispersoid is dispersed in the form of fine particles in a dispersion medium. By using such a resin emulsion (C), a molded product having sufficient mechanical strength can be produced.

  The dispersion medium of the resin emulsion (C) is not particularly limited, but water is preferable from the viewpoint of preventing the release of organic compounds to the working environment and the surrounding environment.

  The dispersoid of the resin emulsion (C) is preferably composed of a resin obtained by polymerizing a monomer having a carbon-carbon double bond. A thermoplastic resin or a thermosetting resin may be used, but a thermoplastic resin is preferable from the viewpoint of easy pressure molding. Examples of such thermoplastic resins include polyvinyl ester resins, ethylene-vinyl ester copolymer resins, acrylic resins that are polymers containing acrylic ester and / or methacrylic ester units, and styrene-butadiene copolymer resins. Examples of the styrene copolymer resin are as follows. Among these, from the viewpoint of adhesiveness and cost, a polyvinyl ester resin or an ethylene-vinyl ester copolymer resin is preferable, and an ethylene-vinyl ester copolymer resin is particularly preferable because of excellent water resistance.

  Examples of the vinyl ester resins include vinyl formate resins, vinyl acetate resins, vinyl propionate resins, vinyl pivalate resins, and the like. Among these, a vinyl acetate resin is preferable because it is easily available. Examples of the ethylene-vinyl ester copolymer resins include ethylene-vinyl formate copolymer resins, ethylene-vinyl acetate copolymer resins, ethylene-vinyl propionate copolymer resins, and ethylene-vinyl pivalate copolymer resins. Is exemplified. Among these, ethylene-vinyl acetate copolymer resin is preferable because it is easily available.

  The ethylene-vinyl ester copolymer resin preferably has an ethylene unit content of 15 to 70 mol% with respect to the total number of ethylene units and vinyl ester units in the resin. If the ethylene unit content is less than 15 mol%, the water resistance of the molded article may be lowered, and it is more preferably 25 mol% or more. If the ethylene unit content exceeds 70 mol%, the adhesive strength may be reduced, and it is more preferably 60 mol% or less.

  The resin emulsion (C) generally contains a dispersant in order to maintain the dispersion stability of the dispersoid. Examples of the dispersant include polyvinyl alcohol, cellulose derivatives, polyacrylic acid derivatives, (anhydrous) maleic acid-vinyl ether copolymer, (anhydrous) maleic acid-vinyl acetate copolymer, isobutylene-maleic anhydride copolymer, acetic acid. Vinyl- (meth) allylsulfonic acid (salt) copolymer and the like are used, and polyvinyl alcohol is preferably used. By using this, the dispersion stability of the dispersoid is improved, and at the same time, the mechanical stability and chemical stability of the resin emulsion (C) are improved, and an appropriate viscosity can be obtained.

As the polyvinyl alcohol used in the present invention, those having various viscosity average polymerization degrees (hereinafter sometimes simply referred to as polymerization degrees) and saponification degrees can be used. Generally, the polymerization degree is 200 to 4000, and the saponification degree is 50 to 100 mol. %. Preferably, the degree of polymerization is 300 to 2000, and the degree of saponification is 85 to 99 mol%. Polyvinyl alcohol modified with a hydrophobic group, a carboxyl group, a sulfonic acid group, a cation group, an acetoacetyl group, a silanol group or the like derived from an α-olefin monomer can also be used. In addition, the viscosity average polymerization degree of polyvinyl alcohol is a value measured according to JIS K6726. That is, after re-saponifying polyvinyl alcohol to a saponification degree of 99.5 mol% or more and purifying it, the value was obtained from the intrinsic viscosity [η] measured in water at 30 ° C. by the following formula.
P = ([η] × 1000 / 8.29) ^{(1 / 0.62)}

  Although the content rate of the said polyvinyl alcohol is not specifically limited, It is 1-50 weight part with respect to 100 weight part of dispersoid which comprises resin emulsion (C), and stability of resin emulsion (C) becomes high. This is preferable. The viscosity of the resin emulsion (C) used in the present invention is not particularly limited, but is usually about 50 to 100,000 mPa · s at 30 ° C.

  The resin emulsion (C) is an anionic emulsifier such as a known sodium alkylbenzenesulfonate, a nonionic emulsifier such as a polyoxyethylene alkyl ether or a cationic emulsifier such as an alkylbenzyldimethylammonium compound, as long as the effects of the present invention are not impaired. It may contain a water-soluble polymer compound such as carboxymethyl cellulose and hydroxyethyl cellulose, and a crosslinking agent such as a polyvalent isocyanate compound.

  As for the solid content rate of the resin emulsion (C) used by this invention, it is preferable that the ratio of the amount of solid content with respect to the total weight of a resin emulsion (C) is 40 to 60 weight%. This is because it becomes easy to apply and mix the resin emulsion (C) by spraying to the bark pulverized product (A) subjected to the surface active treatment with the surface active treatment substance (B). Moreover, it is because the water content of the mixture of the bark pulverized product (A) and the resin emulsion (C) subjected to the surface active treatment with the surface active treatment substance (B) is not excessive. Here, the solid content of the resin emulsion (C) is the weight of the evaporation residue of the resin emulsion (C), and can be measured, for example, by the method described in JIS K6828.

  The blending amount of the surface active treatment substance (B) used in the present invention is preferably 2 to 80 parts by weight with respect to 100 parts by weight of the total bark pulverized product (A) and the surface active treatment substance (B). . If the blending amount is less than 2 parts by weight, the water absorption of the resulting molded product becomes insufficient and the durability may deteriorate. Moreover, there exists a possibility that a flame retardance may fall. The blending amount is more preferably 7 parts by weight or more, and further preferably 10 parts by weight or more. If the amount exceeds 80 parts by weight, the strength of the resulting molded product may be reduced. The blending amount is more preferably 60 parts by weight or less, and further preferably 50 parts by weight or less. Here, in the present invention, the total of 100 parts by weight of the bark pulverized product (A) and the surface active treatment substance (B) refers to the dry weight.

  The mixing amount of the resin emulsion (C) in the present invention is preferably 10 to 60 parts by weight of the solid content with respect to a total of 100 parts by weight of the bark pulverized product (A) and the surface-active substance (B). . If the mixing amount is less than 10 parts by weight, the strength of the resulting molded product may be insufficient. The mixing amount is more preferably 15 parts by weight or more, and further preferably 18 parts by weight or more. On the other hand, when the mixing amount of the solid content exceeds 60 parts by weight, mixing of the resin emulsion (C) becomes non-uniform, and resin spots that are in a state where the resin emulsion (C) is excessively increased locally. . In addition, adhesion to the press panel surface occurs, and the surface properties of the molded product deteriorate. The mixing amount is more preferably 55 parts by weight or less, and further preferably 50 parts by weight or less.

  In the method for producing a molded article of the present invention, components other than the bark pulverized product (A), the surface active treatment substance (B) and the resin emulsion (C) can be mixed within a range not impairing the object of the present invention. . Examples of the component include fillers, solvents, pigments, dyes, preservatives, insecticides, fungicides, and antifoaming agents. In the production of vegetation moldings, fertilizers, seeds, agricultural chemicals, soil conditioners, growth promoters, growth inhibitors, germination promoters, moisture retention materials, and the like are also used. In the production method of the present invention, pressure molding near room temperature is possible, and a molded product can be produced without adversely affecting the seeds. The molded product obtained in the present invention can be pierced to embed the above components. For example, a hole can be drilled in the molded product and a plant can be planted.

  The production method of the present invention comprises a step of mixing the bark pulverized product (A) and the resin emulsion (C) that have been surface-treated with the surface-active treatment substance (B), and a step of pressure-molding the resulting mixture. Consists of.

  The method for preparing the bark pulverized product (A) subjected to the surface active treatment with the surface active treatment substance (B) is not particularly limited. Usually, it is prepared by mixing and stirring the bark pulverized product (A) and the surface active treatment substance (B).

  When the bark pulverized product (A) and the resin emulsion (C) subjected to the surface active treatment with the surface active treatment substance (B) are mixed, it is sufficient that they can be mixed homogeneously, and the method is not particularly limited. The apparatus used for mixing and the mixing time can be appropriately selected according to the types and mixing amounts of the bark pulverized product (A), the surface-active substance (B), and the resin emulsion (C). At this time, it is preferable to sufficiently mix so that the resin emulsion (C) exists on the entire surface of the bark pulverized product (A) and the surface-active substance (B). The method for adding the resin emulsion (C) is not particularly limited. A method such as spray application is used. The bark pulverized product (A) and the surface active treatment substance (B) are mixed, and the resin is used in the same apparatus in which the bark pulverized product (A) subjected to the surface active treatment with the surface active treatment substance (B) is prepared. Emulsion (C) may be mixed.

  In addition, a drying step may be provided before or during the mixing step. For example, a step of drying the bark pulverized product (A) may be provided, or a step of drying after mixing the bark pulverized product (A) and the surface active treatment substance (B) may be provided. The drying method is not particularly limited, and examples thereof include air drying at room temperature, hot air drying, and heat drying in an oven. In the case of providing a drying step, drying is performed so that the moisture content of the bark pulverized product (A) subjected to the surface active treatment with the obtained surface active treatment substance (B) is 30% by weight or less on a dry basis. It is preferable. If the water content exceeds 30% by weight, swelling is likely to occur immediately after pressure molding of the molded product, which may make it difficult to handle the molded product, and is more preferably 20% by weight or less.

  After mixing the bark pulverized product (A) and the resin emulsion (C) subjected to the surface active treatment with the surface active treatment substance (B), a step of moistening the mixture obtained before pressure molding with water is provided. Also good. By providing such a process, the adhesiveness of the mixture is improved, and a molded product having sufficient mechanical strength can be obtained. The method of moistening the mixture with water and the amount of water added are not particularly limited. Further, the bark pulverized product (A) and the resin emulsion (C) that have been surface-treated with the surface-active treatment substance (B) can be mixed and then dried, and then pressure-molded. In this case, it is preferable to heat at the time of pressure molding.

  The mixture of the bark pulverized product (A) and the resin emulsion (C) subjected to the surface active treatment with the surface active treatment substance (B) is then pressure-molded. The pressure of pressure molding is appropriately adjusted according to the density of the molded product to be obtained. Usually, it is about 5-15 MPa. The apparatus used for pressure molding is not particularly limited as long as it can produce a molded product by applying pressure. What can be heated at the same time is suitable, and a hot press or the like is used.

Only a mixture of the bark pulverized product (A) and the resin emulsion (C) which has been surface-treated with the surface-active treatment substance (B) can be pressure-molded, and the mixture can be used as a reinforcing plate such as plywood or gypsum board. It can also be put on and molded integrally with the reinforcing plate. By using a molded product having a reinforcing plate on one side, strength can be ensured, and this is particularly effective when the density of the molded product is about 0.4 g / cm ³ or less.

  The temperature of the pressure molding is not particularly limited, but is preferably 10 to 120 ° C. When the pressure molding temperature exceeds 120 ° C., the energy required for the pressure molding increases. Moreover, there exists a possibility that a molded article may adhere to a press-board surface. The temperature is more preferably 110 ° C. or less, and further preferably 100 ° C. or less. If the pressure molding temperature is less than 10 ° C., the resulting molded article may have insufficient mechanical strength. The temperature is more preferably 30 ° C. or higher, and further preferably 60 ° C. or higher. The pressure molding time is usually about 5 to 30 minutes.

The shape and dimensions of the molded product produced by the production method of the present invention are not particularly limited. A plate-shaped material is suitably formed. Although the density of the molded article manufactured with the manufacturing method of this invention is not specifically limited, It is preferable that the said density is 0.2-0.8 g / cm < ³ >. If the density is less than 0.2 g / cm ³ , the strength of the obtained molded product may be insufficient. The density is more preferably 0.3 g / cm ³ or more. If the density exceeds 0.8 g / cm ³ , the water absorption of the molded product may be reduced. Moreover, when using as a molded article for vegetation, there exists a possibility that the growth of a plant may worsen. More preferably, the density is 0.7 g / cm ³ or less. Here, the density of the molded product is obtained by dividing the weight of the molded product by the apparent volume of the molded product.

  The molded product produced by the production method of the present invention can be used for various applications. Preferred embodiments are a vegetation molded product, a buffer molded product, a heat-insulated molded product, and a soundproof molded product. The molded product for vegetation is not particularly limited as long as it is a vegetation base that can provide an environment in which plants grow. Examples of the vegetation molded products include wall vegetation boards, underwater vegetation boards, slope slope greening boards, rooftop and veranda greening boards, and the like. The shock-absorbing molded article is not particularly limited as long as it is a molded article used for reducing shock and vibration. Examples of the molded article for buffering include a mat for playground equipment and a cushion board that enhances the safety of the promenade. The molded product for heat insulation may be a molded product used to block heat, and is not particularly limited. An example of the molded product for heat insulation is an attic heat insulation sheet. The molded product for soundproofing is not particularly limited as long as it is a molded product used to block sound. Examples of the soundproof molded product include a soundproof wall board.

  Hereinafter, the present invention will be described in more detail with reference to examples. In the examples, measurement and evaluation were performed according to the following methods.

(1) Water absorption A specimen having a length of 50 mm, a width of 50 mm, and a thickness of 16 mm was immersed in water at a temperature of 20 ° C. for 24 hours to absorb water. The weight of the specimen before and after water absorption was measured. The water absorption rate (%) was calculated from each measured value as a ratio (%) of the weight difference (g) of the test specimen before and after water absorption to the weight (g) of the test specimen before water absorption. The number of test specimens was 5, and an average value was obtained and a standard deviation was also obtained.

(2) Water absorption thickness expansion coefficient It measured according to the water absorption thickness expansion coefficient test based on JIS A5908 (particle board). A specimen having a length of 50 mm, a width of 50 mm, and a thickness of 16 mm was immersed in water at a temperature of 20 ° C. for 24 hours to absorb water. The thickness of the specimen before and after water absorption was measured, and the water absorption thickness expansion coefficient was calculated from each measured value. The number of test specimens was 5, and an average value was obtained and a standard deviation was also obtained.

(3) Mass reduction rate (decay resistance test)
It measured according to the fan gas cellar test based on JISK1571 (the performance test method and performance standard of a wood preservative). The test body was 20 mm wide, 100 mm long, and 16 mm thick. Along with the specimen, cedar lumber (sapwood part) (width 20 mm, length 100 mm, thickness 20 mm) was simultaneously provided as a control material for confirming the activity of the decaying fungi. The specimens were embedded at a depth of about 80 mm at a depth of about 80 mm so that each specimen was adjacent to a soil fungus bed in a decaying tank installed in a room at a temperature of 25 to 30 ° C. Soil moisture was constantly maintained at 50 ± 5% of the maximum water holding capacity by watering. The masses of the test specimens before the test and after the lapse of 8 weeks were measured, and the mass reduction rate was calculated from each measured value. The number of test specimens was five, and the average value was obtained and the standard deviation was also obtained. At this time, the mass reduction rate of the cedar lumber was about 15%, and it was confirmed that the decaying fungi in the decaying tank were active.

(4) Total calorific value It measured according to the calorific value test based on JIS K2279 (crude oil and petroleum products-calorific value test method and calculation estimation method). About the sample obtained by grind | pulverizing each test body to a particle size of 1 mm or less, the total calorific value was measured using Shimadzu Corp. make automatic laboratory bomb calorimeter "CA-4AJ". The test was repeated three times to obtain an average value and a standard deviation.

(5) Bending strength It measured according to the bending test based on JIS A5908 (particle board).

(6) Compressive stress Measured according to JIS K7220 (foamed plastic-hard material compression test). The compressive stress at the time of 10% compressive deformation was measured.

(7) Thermal resistance It measured according to JIS A1412 (The measuring method (thermal plate comparison method) of the thermal resistance and thermal conductivity of a heat insulating material). A specimen having a water content of about 10% was used.

Reference example 1
The raw materials used in this reference example are as follows.
[bark]
Cedar and cypress bark.
[Surface-active substance (B)]
Wood burning ash. The cation substitution capacity measured by the semi-micro Schollenberger method is 185 meq / 100 g. The average weight diameter determined by the Andreazen pipette method in accordance with JIS Z8820-2 is 143 μm.
[Resin emulsion (C)]
An ethylene-vinyl acetate copolymer resin having an ethylene unit content of 40 mol% is used as a dispersoid, and a polyvinyl alcohol having a viscosity average polymerization degree of 800 and a saponification degree of 88.2 mol% is used as a dispersant. 10 parts by weight of water with respect to 100 parts by weight of an ethylene-vinyl acetate copolymer resin emulsion containing 5 parts by weight (solid content is 55.3% by weight and viscosity at 30 ° C. is 2500 mPa · s) Resin emulsion.

  The bark was crushed using a hammer mill. In the middle of the pulverization, the wood combustion ash was added so that the weight ratio of the bark to the wood combustion ash was 10/1, followed by pulverization and simultaneous mixing. The water content of the mixture thus obtained was 80% by weight on a dry basis. The mixture was naturally dried until the water content became 15% by weight on a dry basis to obtain a bark combustion ash mixture. The bark pulverized product (A) in the dry weight of 100 parts by weight of the bark combustion ash mixture was 84 parts by weight in dry weight, and the surface-active substance (B) was 16 parts by weight in dry weight. 80% by weight or more of the bark pulverized product (A) in the bark combustion ash mixture was composed of particles having a length of 50 mm or less, a width of 5 mm or less, and a thickness of 1 mm or less. Further, 80% by weight or more of the crushed bark (A) was composed of particles having a length of 5 mm or more.

2385 g of the bark combustion ash mixture was stirred with a rotating drum with an inner blade, and 1037 g of the resin emulsion (C) was applied thereto with an airless spray gun. The mixture of the bark pulverized product (A) and the resin emulsion (C) surface-treated with the surface-active material (B) thus obtained is placed in a square forming box having an inner size of 600 mm. And formed. Using a hot press, the pressing temperature was set to 40 ° C., the pressing time was set to 10 minutes, and pressure forming was performed so that the forming density was 0.6 g / cm ³ and the thickness was 16 mm, thereby obtaining a specimen.

  Using the test specimens thus obtained, the water absorption rate, the water absorption thickness expansion rate, the mass reduction rate, and the total calorific value were measured according to the above methods. The obtained results are summarized in Table 1.

Comparative Example 1
In Reference Example 1, in place of 2385 g of the bark combustion ash mixture, 2385 g of bark pulverized product (A) not containing the surface treatment active substance (B) was used in the same manner as in Reference Example 1, except that the molding density was 0.6 g / A specimen having a thickness of cm ³ and a thickness of 16 mm was produced and evaluated. The obtained results are shown in Table 1.

  From the results of Table 1, the bark pulverized product (A) surface-treated with the surface-active treatment substance (B) and the resin emulsion (C) were mixed, and then the molded product produced by pressure molding was It can be seen that it has both excellent water absorption and decay resistance compared to the case where the surface active treatment substance (B) was not blended. Moreover, the deformation due to water absorption is not large, and the flame retardancy is improved.

Example 1
In Reference Example 1, 4000 g of bark combustion ash mixture and 1700 g of resin emulsion (C) were used, and after forming a plywood with a thickness of 4 mm on the bottom of the forming box, the press temperature was 20 ° C. and the press time was 10 A test specimen was prepared in the same manner as in Reference Example 1 except that the test was performed for one minute and was integrally formed with the plywood so that the molding density was 0.4 g / cm ³ and the thickness was 35 mm. The bending strength and compressive stress of the obtained specimen were measured at normal conditions and after absorbing water for 48 hours in 20 ° C. water.

The bending strength of the obtained specimen was 1.1 N / mm ² in the normal state regardless of the vertical direction of the plywood pasting surface, and had a bending strength sufficient to withstand handling. In addition, it is 0.4 N / mm ² after water absorption, and it is reduced to 40% or less of the normal state, but it has a bending strength that can withstand handling even when it is molded and increased in weight. It was. Thus, it can be seen that the molded article produced according to the present invention has a sufficient water resistance because the bending strength is ensured even during water absorption.

The resulting compressive stress at 10% compressive deformation of the specimen is 0.32 N / mm ² at the normal state was 0.30 N / mm ² after water absorption. From this, it can be seen that the molded article produced according to the present invention sufficiently withstands the treading pressure even during water absorption and has good water resistance.

The thermal resistance in the normal state of the obtained test specimen is 0.4 m ² K / W, which indicates that the wood specimen has good heat insulation.

Example 2
In Reference Example 1, 5000 g of bark combustion ash mixture and 3700 g of resin emulsion (C) were used, and after forming a 4 mm thick plywood on the bottom of the forming box, the press temperature was 90 ° C. and the press time was 10 A molded product was produced in the same manner as in Reference Example 1 except that the molding density was 0.52 g / cm ³ and the thickness was 35 mm. 64 holes having a diameter of 25 mm and a depth of 25 mm were drilled at intervals of about 70 mm in the obtained molded product (length 600 mm, width 600 mm, thickness 35 mm). Twelve molded products with holes were fixed to the vertical wall surface on the south side of the building with screws, and 14 types of plant seedlings shown in FIG. 2 were planted in the holes. A photograph of the molded product immediately after planting a plant seedling is shown in FIG. Watering was carried out for 30 minutes every morning by the irrigation system, and the plants were grown for 61 days. A photograph of the molded product 61 days after the plant seedling was planted is shown in FIG. As can be seen from the photograph in FIG. 3, the plant grew very well. In addition, there were no problems such as damage or dropout of the molded product itself. This shows that the molded product has excellent performance as a vegetation base and can also be used as a wall greening board.

Claims (8)

The bark pulverized product (A) subjected to the surface activation treatment with the surface active treatment substance (B) having a cation substitution capacity of 50 meq / 100 g or more and the resin emulsion (C) are mixed and then integrally molded with the reinforcing plate. A method for producing a wall greening board , characterized in that a molded product having a reinforcing plate on one side is formed by pressure. The method for producing a wall greening board according to claim 1, wherein the surface active treatment substance (B) is at least one selected from the group consisting of clay, silt, activated carbon powder, combustion ash, diatomaceous earth and Kanuma earth. The method for producing a wall greening board according to claim 1 or 2, wherein the surface active treatment substance (B) has an average weight diameter of 0.1 to 350 µm. The resin emulsion (C) is an aqueous emulsion in which a dispersoid is a thermoplastic resin obtained by polymerizing a monomer having a carbon-carbon double bond with polyvinyl alcohol as a dispersant. The manufacturing method of the wall surface greening board of description. The method for producing a wall greening board according to claim 4, wherein the dispersoid of the resin emulsion (C) is an ethylene-vinyl acetate copolymer. The wall surface according to any one of claims 1 to 5, wherein 2 to 80 parts by weight of the surface active treatment substance (B) is blended with respect to a total of 100 parts by weight of the bark pulverized product (A) and the surface active treatment substance (B). A method of manufacturing a greening board . The resin emulsion (C) is mixed so that the solid content is 10 to 60 parts by weight with respect to a total of 100 parts by weight of the bark pulverized product (A) and the surface active treatment substance (B). The manufacturing method of the wall surface greening board in any one of these. The method for producing a wall surface greening board according to any one of claims 1 to 7, wherein the density of the molded product is 0.2 to 0.8 g / cm ³ .

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