JP2008265254A - Fibrous board and its manufacturing process - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fibrous board that excels in adsorption capability of an aldehyde compound such as formaldehyde, a causative substance of sick house syndromes in the rooms of houses and automobiles, and fully exhibits its functions, for example, when used as a construction material or an automobile trim material, and to provide its manufacturing method. <P>SOLUTION: The fibrous board has an average pore size of 3-500 μm measured according to ASTM F-316-86, and at least its surface is added/impregnated with an amine compound. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fiber board.

  Conventionally, wood materials used for building materials and furniture include fiber boards (insulation boards, medium density fiber boards, hard boards) in which wood fibers are bonded with phenol resin or urea melamine resin, lawan, beech For example, a plywood laminated with a single plate such as the above, or a particle board obtained by bonding crushed wood with the above resin is used.

  The above synthetic wood is consumed in large quantities because it has excellent processability and physical properties, but it is called sick house syndrome in new homes and automobiles due to aldehyde compounds such as formaldehyde volatilized from phenol resin and urea melamine resin. The problem is causing chemical sensitivity.

  In recent years, a board material for construction in which a formaldehyde catcher agent made of a mixture of a non-formaldehyde resin and activated carbon is applied to the back surface of a wooden substrate has been proposed (see Patent Document 1). However, since these board materials for construction use general-purpose wood as a substrate, it is possible to suppress the emission of formaldehyde generated from the wooden board material itself, but it adsorbs aldehyde compounds generated from other materials. I couldn't. In addition, since activated carbon mainly used for physical adsorption is used as an adsorbent, there is a concern that adsorbed formaldehyde may be re-released when used at high temperatures such as automobile interior materials.

  Similarly, a method for deodorizing synthetic wooden building materials that reduces the release of aldehydes by treating synthetic wooden building materials with compounds such as hydrazides and azoles has been proposed (see Patent Document 2). These wooden building materials have a relatively good aldehyde adsorption performance (deodorization performance) because they use a chemisorption type catcher agent, but they are also limited to adsorption of aldehyde compounds generated from synthetic wood itself. Adsorption of aldehyde compounds generated from other materials could not be performed.

  On the other hand, a deodorant molded article in which a hydrazide compound is contained in a fiber structure to adsorb aldehydes contained in tobacco odor has been proposed (see Patent Document 3). These have a high aldehyde adsorption performance because they support a chemical adsorption catcher agent on the fiber structure, but because they are fiber structures such as fabrics, they are used as wall materials and flooring materials used in building materials, and automobile interiors. As a door interior base material and a sheet base material used for the material, the bending strength is weak and it is difficult to adapt.

In addition, a coating plate that adsorbs formaldehyde has been proposed by forming a coating film made of primary amine, secondary amines, hydrazine, hydrazine derivatives, aminotriazoles, and ethylene urea on the coating plate (Patent Document). 4). However, these coated plates have a smooth surface and a small specific surface area, and the adsorption performance of aldehydes has not reached the performance required at present.
JP-A-10-252247 (Claims 1 and 4) JP 2002-301706 A (Claim 1) Japanese Patent Laid-Open No. 10-226962 (Claim 1) Japanese Patent Laying-Open No. 2006-88383 (Claims 1 and 2)

  An object of the present invention is a fiber-based board that is excellent in adsorption performance of aldehyde compounds such as formaldehyde, which is a causative substance of sick house syndrome, and that fully exhibits its function when used as, for example, a building material or an automobile interior material, and its production It is to provide a method.

  That is, the present invention is a fiber board characterized in that an average pore size measured based on ASTM F-316-86 is 3 to 500 μm and an amine compound is attached to at least the surface.

  Moreover, this invention is an automotive interior material characterized by using the fiber-type board of this invention.

  Further, the present invention is a method for producing the fiber board of the present invention, wherein a solution containing an amine compound is placed on the surface of a rotating roller, and the solution on the surface of the rotating roller is transferred onto the fiber board, thereby producing a fiber system. A method for producing a fiber-based board, wherein an amine compound is supported on the board.

  The fiber-based board of the present invention is excellent in the adsorption performance of aldehyde compounds such as formaldehyde, which is a causative substance of sick house syndrome in a house or an automobile. For example, when it is used as a building material or an automobile interior material, its function is fully exhibited.

  The fiber board of the present invention is a plate-like body mainly composed of fibers. By containing the fiber, it can have excellent strength while being lightweight. Further, the specific surface area of the board is increased, and the aldehyde compound can be adsorbed efficiently.

  Natural fibers are preferred as the fibers of the fiber board. Natural fibers such as hemp fiber, wool, and grass have a porous structure in their cell parts, have a large contact area with aldehyde gas, and can improve the adsorption performance of aldehydes. Among these, it is preferable to use cellulosic fibers having a long fiber length. Specifically, gramineous plants such as bagasse, wheat straw, reeds, papyrus, bamboo, bast fibers such as cotton, kenaf, roselle, Asa, flax, ramie, jute, hemp, mao, leaf veins such as Sisal and Manila Asa It is a fiber etc., It is preferable that 1 or more types of fibers chosen from these are contained. Among these, fibers collected from kenaf or jute, which have relatively long fiber lengths and belong to herbs that are annual grasses and can be cultivated very quickly and easily in tropical and temperate regions, are preferable. By adopting such a fiber, a fiber board excellent in bending strength can be obtained. In particular, since kenaf bast contains cellulose at a high content of 60% or more and has high strength, it is preferable to use kenaf fibers collected from kenaf bast.

  The average fiber length of the fibers of the fiber board is preferably 5 to 100 mm. By configuring the fiber board with fibers having an average fiber length within this range, a fiber board having excellent strength can be obtained. By setting the thickness to 5 mm or more, more preferably 20 mm or more, and even more preferably 50 mm or more, it is possible to obtain strength that can withstand conveyance, construction, and use. On the other hand, if it exceeds 100 mm, it becomes difficult to uniformly disperse the fiber and the binder component in the production of the fiber-based board, and the productivity is lowered and the strength is not uniform.

  As a binder for binding fibers in a fiber board, a thermoplastic resin such as polylactic acid, polyethylene, or polypropylene does not require an aldehyde compound as a curing agent. This is preferable because the compound does not have to be emitted. Among these, polylactic acid is preferable because it can reduce environmental burden.

  Polylactic acid is made of a plant such as corn, that is, a non-petroleum raw material, uses almost no petroleum solvent in the production process, and has biodegradability. Therefore, the burden on the environment can be reduced at each stage of manufacturing and disposal of the composite board. In addition, polylactic acid has a higher strength than biodegradable plastics and polypropylene and polyethylene, has a melting point of about 170 ° C., has an appropriate heat resistance, has excellent moldability, and other natural fibers and woody materials. Adhesiveness with system materials is also excellent.

  Lactic acid has two optical isomers, L-form and D-form. In either L-form or D-form, the higher the optical purity of polylactic acid, the higher the melting point of polylactic acid, that is, heat resistance is improved. Therefore, it is preferable. The optical purity of polylactic acid is preferably 90% or more.

  The melting point can be increased by blending poly (L lactic acid) and poly (D lactic acid) into a fiber after forming into a fiber and then subjecting it to a high temperature heat treatment at 140 ° C or higher to form a racemic crystal. ,preferable.

  In addition, components other than lactic acid may be copolymerized as long as the biodegradability of polylactic acid is not impaired.

  The weight average molecular weight of polylactic acid is preferably 50,000 to 500,000.

The polylactic acid resin preferably also contains a crystal nucleating agent. The crystal nucleating agent can promote the formation of polylactic acid crystal nuclei and improve the bending strength of the fiber-based board. As the crystal nucleating agent, talc is particularly preferable in that it can be uniformly dispersed in the polylactic acid resin to efficiently form crystal nuclei. As the composition of talc, it is preferable that the ratio of SiO ₂ and MgO in the component excluding the loss during combustion is 93% by mass or more. As an average particle diameter of talc, 0.5-7 micrometers is preferable from a dispersible point. A crystal nucleating agent may be used individually by 1 type, and may use 2 or more types together. As content with respect to the polylactic acid resin of a crystal nucleating agent, 0.1-20 mass% is preferable when obtaining the promotion effect of crystal nucleus formation, without inhibiting the function as a binder of a polylactic acid resin.

  It is important that the fiber board of the present invention is formed by adhering an amine compound to at least the surface. The amine compound can efficiently remove the aldehyde compound by adsorption. In addition, detachment and re-release of aldehyde compounds can be suppressed even when used at high temperatures, such as automobile interior materials.

  As such amine compounds, hydrazide compounds and urea compounds are particularly preferred because of their excellent adsorption performance. A hydrazide compound and a urea compound may be used in combination.

  Examples of the hydrazide compounds include form hydrazide, acetohydrazide, propionic acid hydrazide, lauric acid hydrazide, stearic acid hydrazide, salicylic acid hydrazide, benzoic acid hydrazide, p-hydroxybenzoic acid hydrazide, methyl carbazate, and ethylcarbamate. Examples of dihydrazides such as zetate and semicarbazide hydrochloride include carbonohydrazide, oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, glutaric acid dihydrazide, adipic acid dihydrazide, pimelic acid dihydrazide, suberic acid dihydrazide, azelaic acid hydrazide Dihydrazide, terephthalic acid dihydrazide, isophthalic acid dihydrazide, tartaric acid dihydrazide, malic acid dihydrazide, iminodiacetic acid dihydr Razide, itaconic acid dihydrazide, dodecanediohydrazide, hexadecanediohydrazide, 2,6-naphthoic acid dihydrazide, 1,4-naphthoic acid dihydrazide, 4,4'-bisbenzenedihydrazide, 2,6-pyridinedihydrazide, 1,4- Examples of trihydrazides such as cyclohexanedihydrazide and N, N′-hexamethylenebissemicarbazide include citric acid trihydrazide, pyromellitic acid trihydrazide, 1,2,4-benzenetrihydrazide, nitriloacetic acid trihydrazide, and cyclohexanetricarboxylic acid trihydrazide. As the tetrahydrazide, ethylenediaminetetraacetic acid tetrahydrazide, 1,4,5,8-naphthoic acid tetrahydrazide and the like can be used. Of these, hydrazide compounds having two or more hydrazide groups are preferable, and adipic acid dihydrazide is particularly preferable.

Examples of urea compounds include urea, thiourea, methylurea, ethylurea, dimethylurea, diethylurea, ethyleneurea, guanylurea, guanylthiourea, azodicarbonamide, glycolylurea, acetylurea, and the like. . Among these, ethylene urea is preferable. The amount of the amine compound attached is preferably 0.5 to 20 g / m ^{2 on} at least one side of the fiber board. By setting it to 0.5 g / m ² or more, it is possible to obtain the effect of adsorption removal of the aldehyde compound. On the other hand, it can prevent that an amine compound precipitates from a fiber board by setting it as 20 g / m < ² > or less.

The apparent density of the fiber board of the present invention is preferably 0.2 to 0.95 g / cm ³ . By setting it to 0.95 g / cm ³ or less, it becomes a porous board, the permeability of the amine compound is improved, the contact area with the gas containing the aldehyde compound is widened, and the aldehyde compound is efficiently adsorbed. be able to. Also, light weight can be obtained. On the other hand, the strength can be maintained by setting it to 0.2 g / cm ³ or more.

  It is important for the fiber board of the present invention that the average pore size measured based on ASTM F-316-86 is 3 to 500 μm, and preferably 8 to 500 μm. By having holes on the surface of the board having an average pore size of 3 to 500 μm, it is possible to promote the penetration of the amine compound into the inside of the fiber board, and to sufficiently support the amine compound on the fiber board. . Moreover, the contact area with respect to the gas of a fiber-type board can be expanded, and an aldehyde compound can be adsorbed efficiently. When the average pore size is less than 3 μm, the gas containing the aldehyde compound is difficult to enter the board, and the aldehyde compound cannot be adsorbed efficiently. On the other hand, when the average pore size exceeds 500 μm, the strength of the fiber board decreases.

  Further, the maximum pore size value is 20 times or less of the average pore size, and the minimum value is 1/20 or more of the average pore size, so that uniform aldehyde gas adsorptivity and high strength can be obtained as uniform size pores. Therefore, it is preferable.

  Next, an example of a method for producing the fiber board of the present invention will be described.

(Raw material for fiber board)
As a raw material of the fiber-based board, a thermoplastic resin such as a polylactic acid resin can be preferably used as the natural fiber and the binder as described above.

  It is preferable to add a carbodiimide compound to polylactic acid. Doing so inactivates the reactive end of polylactic acid or the oligomers contained in it, suppresses hydrolysis of polylactic acid, and prevents degradation of fiber boards due to use in high-temperature and high-humidity environments. it can. As the carbodiimide compound, for example, a polymer obtained by polymerizing a diisocyanate compound can be suitably used. Among them, a polymer of 4,4-dicyclohexylmethane carbodiimide, a polymer of tetramethylxylylene carbodiimide and its end are blocked with polyethylene glycol or the like. What was done can be used preferably.

  As the thermoplastic resin, it is preferable to use a short fiber. By doing so, natural fibers and short fibers can be uniformly dispersed by a carding process or the like. Since the average fiber length of the natural fiber is preferably 5 to 100 mm as described above, the average fiber length of 20 to 100 mm is preferable for the thermoplastic resin fiber to efficiently entangle the natural fiber and the thermoplastic resin fiber. By setting it within this range, dispersion spots can be prevented.

  The blending amount of the natural fiber and the thermoplastic resin in the raw material of the fiber-based board is 90-30% by mass of the natural fiber with respect to the fiber-based board, and 10-70% by mass of the thermoplastic resin with respect to the fiber-based board. It is preferable. Bending strength falls that the ratio of a thermoplastic resin is less than 10 mass%. On the other hand, when the ratio of the thermoplastic resin exceeds 70% by weight, the thermoplastic resin flows out of the molding machine due to heating during compression molding, and molding becomes difficult.

(web)
Natural fibers and thermoplastic resin fibers which are raw materials of the fiber board can be uniformly mixed by a carding method using a roller card.

  A web is then formed from the mixture. As an aspect of a web, a nonwoven fabric may be sufficient. Such a nonwoven fabric can be obtained by needle punching the mixture.

As a fabric weight of a nonwoven fabric, 50-2000 g / m < ² > is preferable.

(Lamination and molding)
A fiber-based board can be efficiently manufactured by compressing and integrally forming the laminated web. By doing so, the thermoplastic resin fiber contained in the web plays the role of an adhesive with the natural fiber in compression molding, so there is no need to separately provide an adhesive application step, and the fiber of the present invention is a simple process. A system board can be manufactured efficiently.

  The number of laminated webs is preferably about 2 to 60, although it depends on the application.

  In the compression molding step, it is preferable to heat the web laminated before compression or simultaneously with compression. By heating, the thermoplastic resin can be melted and strong molding can be performed without compression under extremely large pressure, which is preferable as an overall energy cost, and the density of the board can also be adjusted. It can be done easily. In order to form a homogeneous board, it is preferable to heat at the same time as compression.

  The heating temperature is preferably 180 to 220 ° C. in order to melt and uniformly disperse the thermoplastic resin. The heating time is preferably 3 to 20 minutes.

  The compression pressure is preferably 0.5 to 12 MPa although it depends on the fiber material and the heating temperature.

  As a heating / pressurizing device used for compression molding, a so-called flat plate heating press device using two upper and lower heated flat plates can be employed.

  Further, when a relatively thick board having a thickness of 10 mm or more is formed, it is preferable to use a high frequency induction heating device. Since the apparatus can uniformly heat the inside of the laminated body of the web, a board having uniform characteristics such as bending strength, piercing ability with respect to needles and screws, and retention thereof can be obtained.

(Addition of amine compounds)
The amine compound can be attached to the fiber board by applying an aqueous solution thereof by a spray method, a roll coating method or the like.

  Among these, the roll coating method is a method in which an aqueous solution is applied to the surface of the rotating roller, and the aqueous solution on the surface of the rotating roller is transferred to the fiber board while applying pressure, and the aqueous solution penetrates into the board by the pressure of the roller. This is preferable.

  The viscosity of the aqueous amine compound solution in the roll coating method is preferably 300 to 50000 mPa · s. By adjusting the viscosity within the range, the aqueous solution can be uniformly applied. For the adjustment of the viscosity of the aqueous solution, a cellulose-based thickener such as carboxymethylcellulose or hydroxymethylcellulose, or an acrylic-based petroleum thickener can be used. Among these, a cellulose-based thickener is preferable because it is derived from a plant and has high safety.

  As addition amount with respect to the aqueous solution of a thickener, 0.5-10 mass% is preferable.

(Dry)
The fiber board after application of the aqueous solution is naturally dried or dried at 50 to 120 ° C. using a dryer. When the drying temperature exceeds 120 ° C., the amine compound is decomposed and the adsorption performance of the aldehyde compound may be lowered, which is not preferable.

[Measuring method]
(1) Amount of Amine Compound Adhesion In each of the examples and comparative examples, the fiber board before the amine compound was attached was allowed to stand for 24 hours in a standard state at a temperature of 20 ° C. and a humidity of 65% RH, and then 30 cm × Three 30 cm test pieces were cut out, and the mass (m ₁ ) of the test piece before attachment was measured.
Next, in the same manner as in the corresponding Examples and Comparative Examples, an aqueous amine compound solution was applied to the test piece, dried at a temperature of 50 ° C. for 24 hours, and then allowed to stand for 24 hours in the above standard state. The mass (m ₂ ) of the piece was measured.
After obtaining the amount of attachment for each test piece by the following formula, the average value of the three test pieces was calculated.
Amount of coating (g / m ² ) = (m ₂ −m ₁ ) / S
Here, m ₁ : mass of the test piece before attachment (g)
m ₂ : Mass of the test piece after attachment (g)
S: Area (m ² ) of the test piece.

(2) Apparent density of fiber board It measured according to JIS A 5905: 2003 6.3.
The fiber-based board was left for 24 hours in a standard state at a temperature of 20 ° C. and a humidity of 65% RH, and three 10 cm × 10 cm test pieces were cut out. For one test piece, the width, length, and thickness of the measurement points shown in FIG. 5 are measured in the above definition, and the average value for each is obtained to obtain the width, length, and thickness of the test piece. Volume (v) Asked. Next, mass (m) was measured and calculated by the following formula. The thickness was measured to 0.05 mm, the width and length were 0.1 mm, the mass was measured to an accuracy of 0.1 g, and the density was calculated to the order of 0.01 g / cm ³ . After obtaining the density for each test piece, the average value of the three test pieces was obtained.
Density (g / cm ³ ) = m / v
Where m: mass (g)
v: Volume (cm ³ ).

(3) Average pore size of fiber-based board Based on ASTM F-316-86, using a porous material automatic pore size distribution system (“Automated Perm Meter” CFP-1200-AEXCS manufactured by Porous Materials, Inc.) under the following conditions It was measured.
Test piece clamping pressure: 40 MPa
Specimen size: 45mm in diameter
Measurement size: 30 mm in diameter.

(4) Formaldehyde adsorption property The fiber-based board was left for 24 hours in a standard state of a temperature of 20 ° C. and a humidity of 65% RH, and then three 13 cm × 3 cm test pieces were cut out. One board was put into a 550 mL container with formaldehyde gas sealed so that the initial concentration would be 100 ppm, allowed to stand for 30 minutes, and then the residual formaldehyde concentration was measured with a formaldehyde gas detector tube (the lower the residual formaldehyde concentration, the more adsorbent). Excellent). After determining the residual formaldehyde concentration for each test piece, the average value of the three test pieces was determined.

(5) Acetaldehyde adsorptivity Measurement was performed in the same manner as in the above (4) except that the gas used was acetaldehyde gas and the detector tube was changed to acetaldehyde (the smaller the residual acetaldehyde concentration, the better the adsorptivity).

[Example 1]
(Nonwoven fabric)
Polylactic acid resin was spun by melt spinning, crimped, and cut to obtain polylactic acid short fibers having a fineness of 6.6 dtex and an average fiber length of 51 mm. The polylactic acid short fibers and the kenaf bast fibers having an average fiber length of 75 mm were mixed using a roller card at a mass ratio of 30:70, and opened to obtain a nonwoven fabric having a basis weight of 1000 g / m ² .

(Lamination and molding)
Three sheets of the above-mentioned nonwoven fabric are laminated, and then this laminated body is sandwiched between two iron plates of a flat plate heating press apparatus together with a 5 mm spacer and subjected to heat and pressure molding at a temperature of 200 ° C. and a pressure of 2.4 MPa for 7 minutes. And a fiber board was obtained.

(Preparation of amine compound aqueous solution)
Adipic acid dihydrazide 0.3% by mass as an amine compound and 1.3% by mass of carboxymethyl cellulose as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 980 mPa · s.

(Amine compound aqueous solution coating and drying)
Using the roll coating machine, the amine-based compound aqueous solution was applied to both sides of the fiber-based board by 50 g / m ² (100 g / m ^{2 in} total). Next, using a dryer, drying was performed at a temperature of 50 ° C. for 24 hours to obtain a fiber board to which an amine compound was attached.

The fiber board on which the amine compound was impregnated had a thickness of 5.2 mm, a density of 0.63 g / cm ³ , an adipic acid dihydrazide addition amount of 0.32 g / m ² , and an average pore size of 12.1 μm.
This fiber-based board was slightly inferior in acetaldehyde adsorptivity but excellent in formaldehyde adsorptivity.

[Example 2]
(Nonwoven fabric)
The same one as used in Example 1 was used.

(Lamination and molding)
Three non-woven fabrics were laminated, and a fiber board was obtained in the same manner as in Example 1.

(Preparation of amine compound aqueous solution)
Adipic acid dihydrazide 1.0% by mass as an amine compound and 1.3% by mass of carboxymethyl cellulose as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 930 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine-based compound aqueous solution was applied to both surfaces of the fiber-based board and dried in the same manner as in Example 1 to obtain a fiber-based board to which an amine-based compound was attached.

The fiber-based board on which the amine compound was impregnated had a thickness of 5.1 mm, a density of 0.65 g / cm ³ , an adipic acid dihydrazide adhering amount of 1.08 g / m ² , and an average pore size of 10.6 μm.
This fiber board was excellent in formaldehyde adsorption property and acetaldehyde adsorption property.

[Example 3]
(Nonwoven fabric)
The same one as used in Example 1 was used.

(Lamination and molding)
Three non-woven fabrics were laminated, and a fiber board was obtained in the same manner as in Example 1.

(Preparation of amine compound aqueous solution)
Adipic acid dihydrazide (5.0% by mass) as an amine compound and carboxymethyl cellulose (1.3% by mass) as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 1050 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine-based compound aqueous solution was applied to both surfaces of the fiber-based board and dried in the same manner as in Example 1 to obtain a fiber-based board to which an amine-based compound was attached.

The fiber board on which the amine compound was impregnated had a thickness of 5.4 mm, a density of 0.61 g / cm ³ , an adipic acid dihydrazide addition amount of 5.31 g / m ² , and an average pore size of 13.5 μm.
This fiber board was excellent in formaldehyde adsorption property and acetaldehyde adsorption property.

[Example 4]
(Nonwoven fabric)
The same one as used in Example 1 was used.

(Lamination and molding)
Three non-woven fabrics were laminated, and a fiber board was obtained in the same manner as in Example 1.

(Preparation of amine compound aqueous solution)
Adipic acid dihydrazide 10.0% by mass as an amine compound and carboxymethyl cellulose 1.3% by mass as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 1080 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine-based compound aqueous solution was applied to both surfaces of the fiber-based board and dried in the same manner as in Example 1 to obtain a fiber-based board to which an amine-based compound was attached.

The fiber-based board to which the amine compound was attached had a thickness of 5.1 mm, a density of 0.61 g / cm ³ , an adipic acid dihydrazide addition amount of 10.18 g / m ² , and an average pore size of 9.8 μm.
This fiber board was excellent in formaldehyde adsorption property and acetaldehyde adsorption property.

[Example 5]
(Nonwoven fabric)
The same one as used in Example 1 was used.

(Lamination and molding)
Three non-woven fabrics were laminated, and a fiber board was obtained in the same manner as in Example 1.

(Preparation of amine compound aqueous solution)
Adipic acid dihydrazide 15.0% by mass as an amine compound and carboxymethyl cellulose 1.3% by mass as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 1080 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine-based compound aqueous solution was applied to both surfaces of the fiber-based board and dried in the same manner as in Example 1 to obtain a fiber-based board to which an amine-based compound was attached.

The fiber board on which the amine compound was impregnated had a thickness of 5.5 mm, a density of 0.61 g / cm ³ , an adipic acid dihydrazide attachment amount of 14.76 g / m ² , and an average pore size of 13.2 μm.
This fiber board was excellent in formaldehyde adsorption property and acetaldehyde adsorption property.

[Example 6]
(Nonwoven fabric)
The same one as used in Example 1 was used.

(Lamination and molding)
Two of the above nonwoven fabrics were laminated, and a fiber board was obtained in the same manner as in Example 1.

(Preparation of amine compound aqueous solution)
Adipic acid dihydrazide (5.0% by mass) as an amine compound and carboxymethyl cellulose (1.3% by mass) as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 1050 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine-based compound aqueous solution was applied to both surfaces of the fiber-based board and dried in the same manner as in Example 1 to obtain a fiber-based board to which an amine-based compound was attached.

The fiber board on which the amine compound was impregnated had a thickness of 5.2 mm, a density of 0.42 g / cm ³ , an adipic acid dihydrazide attachment amount of 5.96 g / m ² , and an average pore size of 21.8 μm.
This fiber board was excellent in formaldehyde adsorption property and acetaldehyde adsorption property.

[Example 7]
(Nonwoven fabric)
The same one as used in Example 1 was used.

(Lamination and molding)
Five sheets of the above-mentioned nonwoven fabric were laminated, and a fiber board was obtained in the same manner as in Example 1.

(Preparation of amine compound aqueous solution)
Adipic acid dihydrazide (5.0% by mass) as an amine compound and carboxymethyl cellulose (1.3% by mass) as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 1050 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine-based compound aqueous solution was applied to both surfaces of the fiber-based board and dried in the same manner as in Example 1 to obtain a fiber-based board to which an amine-based compound was attached.

The fiber board on which the amine compound was impregnated had a thickness of 5.1 mm, a density of 1.05 g / cm ³ , an adipic acid dihydrazide addition amount of 4.87 g / m ² , and an average pore size of 6.4 μm.
This fiber-based board was slightly inferior in acetaldehyde adsorptivity but excellent in formaldehyde adsorptivity.

[Example 8]
(Nonwoven fabric)
The same one as used in Example 1 was used.

(Lamination and molding)
Three non-woven fabrics were laminated, and a fiber board was obtained in the same manner as in Example 1.

(Preparation of amine compound aqueous solution)
Ethylene urea 0.3% by mass as an amine compound and carboxymethyl cellulose 1.3% by mass as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 1050 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine-based compound aqueous solution was applied to both surfaces of the fiber-based board and dried in the same manner as in Example 1 to obtain a fiber-based board to which an amine-based compound was attached.

The fiber board on which the amine compound was impregnated had a thickness of 5.5 mm, a density of 0.65 g / cm ³ , an ethylene urea attachment amount of 0.38 g / m ² , and an average pore size of 13.1 μm.
This fiber-based board was slightly inferior in acetaldehyde adsorptivity but excellent in formaldehyde adsorptivity.

[Example 9]
(Nonwoven fabric)
The same one as used in Example 1 was used.

(Lamination and molding)
Three non-woven fabrics were laminated, and a fiber board was obtained in the same manner as in Example 1.

(Preparation of amine compound aqueous solution)
As an amine compound, 1.0% by mass of ethylene urea and 1.3% by mass of carboxymethyl cellulose as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 980 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine-based compound aqueous solution was applied to both surfaces of the fiber-based board and dried in the same manner as in Example 1 to obtain a fiber-based board to which an amine-based compound was attached.

The fiber board on which the amine compound was impregnated had a thickness of 5.4 mm, a density of 0.62 g / cm ³ , an ethylene urea attachment amount of 0.97 g / m ² , and an average pore size of 10.9 μm.
This fiber board was excellent in formaldehyde adsorption property and acetaldehyde adsorption property.

[Example 10]
(Nonwoven fabric)
The same one as used in Example 1 was used.

(Lamination and molding)
Three non-woven fabrics were laminated, and a fiber board was obtained in the same manner as in Example 1.

(Preparation of amine compound aqueous solution)
Ethylene urea 5.0% by mass as an amine compound and carboxymethyl cellulose 1.3% by mass as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 1150 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine-based compound aqueous solution was applied to both surfaces of the fiber-based board and dried in the same manner as in Example 1 to obtain a fiber-based board to which an amine-based compound was attached.

The fiber board on which the amine compound was impregnated had a thickness of 5.2 mm, a density of 0.66 g / cm ³ , an ethylene urea attachment amount of 5.83 g / m ² , and an average pore size of 9.4 μm.
This fiber board was excellent in formaldehyde adsorption property and acetaldehyde adsorption property.

[Example 11]
(Nonwoven fabric)
The same one as used in Example 1 was used.

(Lamination and molding)
Three non-woven fabrics were laminated, and a fiber board was obtained in the same manner as in Example 1.

(Preparation of amine compound aqueous solution)
Ethylene urea 10.0% by mass as an amine compound and carboxymethyl cellulose 1.3% by mass as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 1150 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine-based compound aqueous solution was applied to both surfaces of the fiber-based board and dried in the same manner as in Example 1 to obtain a fiber-based board to which an amine-based compound was attached.

The fiber board on which the amine compound was impregnated had a thickness of 5.3 mm, a density of 0.63 g / cm ³ , an ethylene urea attachment amount of 10.87 g / m ² , and an average pore size of 12.5 μm.
This fiber board was excellent in formaldehyde adsorption property and acetaldehyde adsorption property.

[Example 12]
(Nonwoven fabric)
The same one as used in Example 1 was used.

(Lamination and molding)
Three non-woven fabrics were laminated, and a fiber board was obtained in the same manner as in Example 1.

(Preparation of amine compound aqueous solution)
Ethylene urea 15.0% by mass as an amine compound and carboxymethyl cellulose 1.3% by mass as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 1280 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine-based compound aqueous solution was applied to both surfaces of the fiber-based board and dried in the same manner as in Example 1 to obtain a fiber-based board to which an amine-based compound was attached.

The fiber board on which the amine compound was impregnated had a thickness of 5.4 mm, a density of 0.64 g / cm ³ , an ethylene urea attachment amount of 15.26 g / m ² , and an average pore size of 13.3 μm.
This fiber board was excellent in formaldehyde adsorption property and acetaldehyde adsorption property.

[Example 13]
(Nonwoven fabric)
The same one as used in Example 1 was used.

(Lamination and molding)
Two of the above nonwoven fabrics were laminated, and a fiber board was obtained in the same manner as in Example 1.

(Preparation of amine compound aqueous solution)
Ethylene urea 5.0% by mass as an amine compound and carboxymethyl cellulose 1.3% by mass as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 1150 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine-based compound aqueous solution was applied to both surfaces of the fiber-based board and dried in the same manner as in Example 1 to obtain a fiber-based board to which an amine-based compound was attached.

The fiber board on which the amine compound was impregnated had a thickness of 5.2 mm, a density of 0.44 g / cm ³ , an amount of ethylene urea attached of 5.87 g / m ² , and an average pore size of 25.3 μm.
This fiber board was excellent in formaldehyde adsorption property and acetaldehyde adsorption property.

[Example 14]
(Nonwoven fabric)
The same one as used in Example 1 was used.

(Lamination and molding)
Five sheets of the above-mentioned nonwoven fabric were laminated, and a fiber board was obtained in the same manner as in Example 1.

(Preparation of amine compound aqueous solution)
Ethylene urea 5.0% by mass as an amine compound and carboxymethyl cellulose 1.3% by mass as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 1150 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine-based compound aqueous solution was applied to both surfaces of the fiber-based board and dried in the same manner as in Example 1 to obtain a fiber-based board to which an amine-based compound was attached.

The fiber board on which the amine compound was impregnated had a thickness of 5.3 mm, a density of 1.08 g / cm ³ , an ethylene urea attachment amount of 4.82 g / m ² , and an average pore size of 6.1 μm.
This fiber-based board was slightly inferior in acetaldehyde adsorptivity but excellent in formaldehyde adsorptivity.

[Comparative Example 1]
(board)
An MDF (medium density fiber board) having a thickness of 5.5 mm and a density of 0.6 g / cm ³ was prepared.

(Preparation of amine compound aqueous solution)
Adipic acid dihydrazide (5.0% by mass) as an amine compound and carboxymethyl cellulose (1.3% by mass) as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 1050 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine compound aqueous solution was applied to both sides of the MDF and dried in the same manner as in Example 1 to obtain an MDF to which an amine compound was attached.

The MDF to which the amine compound was attached had a thickness of 5.7 mm, a density of 0.65 g / cm ³ , an adipic acid dihydrazide addition amount of 5.28 g / m ² , and an average pore size of 1.2 μm.
This MDF was inferior to formaldehyde adsorption property and acetaldehyde adsorption property.

[Comparative Example 2]
(board)
The same one as used in Comparative Example 1 was used.

(Preparation of amine compound aqueous solution)
Ethylene urea 5.0% by mass as an amine compound and carboxymethyl cellulose 1.3% by mass as a thickener were dissolved in distilled water to obtain an aqueous solution having a viscosity of 1150 mPa · s.

(Amine compound aqueous solution coating and drying)
The amine compound aqueous solution was applied to both sides of the MDF and dried in the same manner as in Example 1 to obtain an MDF to which an amine compound was attached.

The MDF to which the amine compound was attached had a thickness of 5.6 mm, a density of 0.65 g / cm ³ , an ethylene urea attachment amount of 5.36 g / m ² , and an average pore size of 0.9 μm.
This MDF was inferior to formaldehyde adsorption property and acetaldehyde adsorption property.

[Comparative Example 3]
(Nonwoven fabric)
The same one as used in Example 1 was used.

(Lamination and molding)
Three of the above nonwoven fabrics were laminated and laminated and molded in the same manner as in Example 1 to obtain a fiber board having a thickness of 5.2 mm, a density of 0.62 g / cm ³ , and an average pore size of 11.2 μm.
This fiber-based board was subjected to evaluation without applying an amine-based compound aqueous solution. This fiber board was inferior in formaldehyde adsorbability and acetaldehyde adsorbability.

  From the table, the examples have certain formaldehyde adsorptivity and acetaldehyde adsorptivity, but the comparative examples were inferior in both formaldehyde adsorptivity and acetaldehyde adsorptivity.

  Since the fiber-based board of the present invention has excellent aldehyde compound adsorption performance, it is a building material for residences, offices, hospitals, public facilities, etc., automobile seat substrate, door substrate, package tray, dashboard, spare tire cover It is suitably used as an automobile interior material such as a truck bed lining and furniture such as a chair and a desk. Above all, its functions are fully demonstrated when used as an automobile interior material.

Claims (7)

  A fiber-based board having an average pore size measured based on ASTM F-316-86 of 3 to 500 μm, and an amine compound attached to at least the surface.   The fiber board according to claim 1, wherein the amine compound is a hydrazide compound.   The fiber board according to claim 1, wherein the amine compound is a urea compound.   The fiber board according to any one of claims 1 to 3, comprising a natural fiber and a thermoplastic resin. The fiber board according to any one of claims 1 to 4, wherein the amine compound is attached to 0.5 to 20 g / m ² on at least one side.   An automotive interior material comprising the fiber-based board according to any one of claims 1 to 5.   A method for producing a fiber board according to any one of claims 1 to 5, wherein a solution containing an amine compound is placed on the surface of a rotating roller, and the solution on the surface of the rotating roller is transferred to the fiber board, A method for producing a fiber board, comprising supporting an amine compound on the fiber board.