JP3595538B2 - Deodorizing method of synthetic wooden building material, manufacturing method of deodorizing synthetic wooden building material, and deodorizing synthetic wooden building material - Google Patents

Description

【００３５】
表１の結果から実施例の消臭合板は、ホルムアルデヒドの放散量が顕著に抑制された高品質の合板であることがわかる。
【００３６】
実施例４
常法によって解繊された木質ファイバー１００重量部に１重量部のワックスを添加し、さらに、ワックスを含む木質ファイバー１００重量部に、１３重量部の割合で尿素樹脂接着剤を塗布した後、木質ファイバーを乾式手法によってマット状にフォーミングし、更にプリプレスしたマットを熱盤温度２００℃、圧力１５．７０ＭＰａでホットプレスして厚さ１２ｍｍのＭＤＦを得た。
ホットプレスした直後（表面温度約１２０℃）、その両面にアジピン酸ジヒドラジド５重量％水溶液を４ｇ／尺^２（４４．４４ｇ／ｍ^２）の割合で刷毛塗りにより塗布し、常温で２４時間保持して乾燥させることにより厚さ１２ｍｍの実施例４のＭＤＦを得た。
そして、このものを５ｃｍ×１５ｃｍの大きさに切断し試験片とした。
【００３７】
実施例５〜６及び比較例５〜８
実施例４と同様にマットをホットプレスした後、これを常温（２０℃）まで冷却し、厚さ１２ｍｍのＭＤＦを得た。このものを５ｃｍ×１５ｃｍの大きさに切断した。尚、そのうち一枚を比較例８（未処理）の試験片とした。得られた複数枚のＭＤＦ片を、それぞれ表２に示す温度の恒温槽に静置し、表面温度がこの恒温槽の設定温度に達したのを確認した後、その両面にアジピン酸ジヒドラジド５重量％水溶液を４ｇ／尺^２（４４．４４ｇ／ｍ^２）の割合で刷毛塗りにより塗布し、常温で２４時間乾燥させ、実施例５、６及び比較例５〜７のＭＤＦ（試験片）を得た。
【００３８】
実施例４〜６、比較例５〜８で得られたＭＤＦ（試験片）につき、ホルムアルデヒドの放散量を上述の試験例に準じて測定した。
結果を併せて表２に示す。
【００３９】
【表２】

【００４０】
表２の結果から実施例の消臭合板は、ホルムアルデヒドの放散量が顕著に抑制された高品質のＭＤＦであることがわかる。
【００４１】
【発明の効果】
本発明に係る合成木質建材の消臭方法によれば、ホルムアルデヒドなどのアルデヒド類を効率的に除去することができる。
また、本発明に係る消臭合成木質建材の製造方法によれば、ヒドラジド類等を処理する際に、木質材料を接着剤にて接着する際に加熱した熱を利用するため、別途加熱をしなくてもアルデヒド類の放出が低減された消臭合成木質建材を得ることができる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a synthetic wood building material capable of releasing aldehydes such as formaldehyde and the like, which relates to an invention for efficiently suppressing this release.
[0002]
Problems to be solved by the prior art and the invention
Conventionally, various types of plywood, such as plywood, decorative plywood, and printed plywood, laminated wood, strand board, particle board, and synthetic wood-based building materials such as fiber board (insulation board, MDF, and hard board) are known, but all are natural. Unlike wood, it is an artificial wooden building material manufactured by bonding wood materials with an adhesive or adding an adhesive and crimping it. It has the feature of. For this reason, it is widely used as a building material used for flooring, ceiling materials, roofing materials, side panels, etc. of general houses and other buildings, as an outer panel material for ships and railway vehicles, and as a variety of building materials such as furniture materials. ing.
[0003]
Among these synthetic wood-based building materials, for example, plywood is usually cut from raw wood and peeled off (peeled off in the same manner as radish flakes), and an adhesive is applied to a veneer obtained by cutting. Then, it is manufactured by laminating a plurality of (usually an odd number) such that the grain (fiber direction) becomes a right angle and bonding them under pressure.
Such plywood has the disadvantage that aldehydes contained in the raw wood itself, which is the raw material of the plywood, and aldehydes contained in the components of the adhesive are released into the environment during use. In this regard, in recent years, this phenomenon is considered to be the cause of a phenomenon called so-called sick house syndrome in newly built houses and the like, and effective countermeasures have been demanded. The same applies to synthetic wooden building materials other than plywood.
[0004]
In view of the above, an object of the present invention is to provide a method for deodorizing a synthetic wooden building material having a higher deodorizing effect.
Furthermore, an object of the present invention is to provide a method for producing a deodorant synthetic wooden building material which emits less aldehydes and is excellent in economical efficiency, and to provide a deodorant synthetic wooden building material.
[0005]
[Means for Solving the Problems]
The present inventors have previously proposed a method of remarkably suppressing the release of aldehydes into the environment by reacting and adsorbing aldehydes using hydrazide compounds and the like, and have shown excellent effects. Further, as a result of an improved study for solving the above problems, the present invention has been completed.
[0006]
That is, the present invention relates to at least one compound selected from hydrazides, azoles and azines at a temperature of 60 to 140 ° C. during or after the production of synthetic wood building materials.(Excluding those mixed with epoxy resin)The present invention relates to a method for deodorizing a synthetic wooden building material for treating (hereinafter, sometimes referred to as “hydrazides or the like”).
In addition, the present invention relates to a method for producing at least one compound selected from hydrazides, azoles and azines during or after the production of synthetic wood building materials.(Excluding those mixed with epoxy resin)And heating the same to a temperature of 60 to 140 ° C.
Further, the present invention provides an100-150A method for producing a synthetic wooden building material by heating and pressurizing at ℃,While at a temperature of 60-140 ° C,At least one compound selected from hydrazides, azoles and azines(Excluding those mixed with epoxy resin)The present invention relates to a method for producing a deodorant synthetic wooden building material.
Further, the present invention relates to a synthetic wooden building material in which a wooden material is bonded via an adhesive, and at least one selected from hydrazides, azoles and azines at a temperature of 60 to 140 ° C. Species of compound(Excluding those mixed with epoxy resin)Pertaining to deodorized synthetic wooden building materials that have been treated.
Furthermore, the present invention relates to a synthetic wooden building material in which a wooden material is adhered via an adhesive, wherein at least one compound selected from hydrazides, azoles and azines(Excluding those mixed with epoxy resin)Which is heated to a temperature of 60 to 140 ° C. in the presence of the compound.
[0007]
Although the mechanism of action is not always clear by treating at such a temperature or at such a temperature after the treatment, the ability to remove aldehydes such as hydrazides (deodorizing effect) is remarkable as compared with treatment at room temperature. Can be improved. If the temperature is lower than 60 ° C., the deodorizing effect cannot be improved, which is not preferable. Further, if the temperature exceeds 140 ° C., the effect of improving the deodorizing effect decreases, which is not preferable. The treatment of hydrazides or the like refers to, for example, applying a treatment agent containing hydrazides or the like to the surface of the object to be treated with a brush or a roller, and spraying, dropping, or spraying the treatment agent on the surface of the object to be treated. An operation for causing contact of a hydrazide or the like to at least the object to be treated, such as immersing the object to be treated in the treatment agent, mixing hydrazides or the like with the object to be treated, that is, at least in the object to be treated or This refers to the operation of causing hydrazides or the like to exist on the surface.
As the object to be treated, a member (for example, a wood material such as a veneer or a strand chip, an adhesive, or the like) constituting the synthetic wood building material, a manufactured synthetic wood building material itself, or the like is applicable.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, at least one compound selected from hydrazides, azoles and azines is used.
Examples of the hydrazides include a monohydrazide compound having one hydrazide group in the molecule, a dihydrazide compound having two hydrazide groups in the molecule, and a polyhydrazide compound having three or more hydrazide groups in the molecule. Can be.
[0009]
Specific examples of the monohydrazide compound include, for example, those represented by the general formula
R-CO-NHNH₂        (1)
[In the formula, R represents a hydrogen atom, an alkyl group, or an aryl group which may have a substituent. ]
And a monohydrazide compound represented by the following formula:
[0010]
In the general formula (1), examples of the alkyl group represented by R include a methyl group, an ethyl group, an n-propyl group, an n-butyl group, an n-pentyl group, an n-hexyl group, an n-heptyl group, Examples thereof include a linear alkyl group having 1 to 12 carbon atoms such as an n-octyl group, an n-nonyl group, an n-decyl group, and an n-undecyl group. Examples of the aryl group include a phenyl group, a biphenyl group, a naphthyl group and the like, and among these, a phenyl group is preferable. Examples of the substituent of the aryl group include a hydroxyl group, a halogen atom such as fluorine, chlorine, and bromine, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a tert-butyl group, and an iso group. And a straight-chain or branched-chain alkyl group having 1 to 4 carbon atoms such as -butyl group.
[0011]
More specifically, the hydrazide compound of the general formula (1) includes, for example, lauric hydrazide, salicylic hydrazide, form hydrazide, acetohydrazide, propionic hydrazide, p-hydroxybenzoic hydrazide, naphthoic hydrazide, and 3-hydroxy-hydrazide. Examples thereof include 2-naphthoic acid hydrazide.
[0012]
Specific examples of the dihydrazide compound include, for example, those represented by the general formula
H₂NHN-X-NHNH₂    (2)
[In the formula, X represents a group -CO- or a group -CO-A-CO-. A represents an alkylene group or an arylene group. ]
And a dihydrazide compound represented by the following formula:
[0013]
In the general formula (2), examples of the alkylene group represented by A include a methylene group, an ethylene group, a trimethylene group, a tetramethylene group, a pentamethylene group, a hexamethylene group, a heptamethylene group, an octamethylene group, and a nonamethylene group. And a straight-chain alkylene group having 1 to 12 carbon atoms such as a decamethylene group and an undecamethylene group. Examples of the substituent of the alkylene group include a hydroxyl group. Examples of the arylene group include a phenylene group, a biphenylene group, a naphthylene group, an anthrylene group, and a phenanthrylene group. Of these, a phenylene group, a naphthylene group and the like are preferable. Examples of the substituent for the arylene group include the same substituents as those for the aryl group.
[0014]
Specific examples of the dihydrazide compound of the general formula (2) include, for example, oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, adipic acid dihydrazide, azelaic acid dihydrazide, sebacic acid dihydrazide, dodecane diacid dihydrazide, and maleic acid. Dihydrazide such as dihydrazide, fumaric acid dihydrazide, diglycolic acid dihydrazide, tartaric acid dihydrazide, malic acid dihydrazide, isophthalic acid dihydrazide, terephthalic acid dihydrazide, dimer acid dihydrazide, and 2,6-naphthoic acid dihydrazide. Further, various dibasic acid dihydrazide compounds described in JP-B-2-4607, 2,4-dihydrazino-6-methylamino-sym-triazine and the like can also be used as the dihydrazide of the present invention.
[0015]
Specific examples of the polyhydrazide compound include polyacrylic hydrazide.
Among these, a dihydrazide compound is preferred, dibasic dihydrazide is particularly preferred, and adipic dihydrazide is even more preferred.
The above hydrazide compounds can be used alone or in combination of two or more.
[0016]
As the azoles and azines, known 5- or 6-membered heterocyclic compounds having two or three nitrogen atoms as hetero atoms can be widely used. These heterocyclic compounds include a linear or branched alkyl group having about 1 to 4 carbon atoms, an aryl group which may have one or more substituents, a hydroxyl group, an amino group, and an alkylamino group. , One or more substituents such as dialkylamino, arylamino, diarylamino, mercapto, ester, carboxyl, benzotriazolyl, 1-hydroxybenzotriazolyl, etc. You may. Here, examples of the linear or branched alkyl group having about 1 to 4 carbon atoms include methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, tert-butyl and the like. Can be Examples of the aryl group include a phenyl group, a biphenyl group, and a naphthyl group. These groups include a hydroxyl group, a halogen atom, a sulfonic acid group, and a linear or branched alkyl group having 1 to 4 carbon atoms. May have one or more substituents. When the compound has a carboxyl group as a substituent, its ester is also included in the active ingredient of the present invention.
[0017]
Examples of the azoles include a diazole compound, a triazole compound, a thiadiazole compound and the like, and a diazole compound and a triazole compound can be preferably used.
Specific examples of the diazole compound include, for example, 3-methyl-5-pyrazolone, 1,3-dimethyl-5-pyrazolone, 3-methyl-1-phenyl-5-pyrazolone, 3-phenyl-6-pyrazolone, 3-methyl Pyrazolone compounds such as -1- (3-sulfophenyl) -5-pyrazolone, pyrazole, 3-methylpyrazole, 1,4-dimethylpyrazole, 3,5-dimethylpyrazole, 3,5-dimethyl-1-phenylpyrazole, 3-aminopyrazole, 5-amino-3-methylpyrazole, 3-methylpyrazole-5-carboxylic acid, 3-methylpyrazole-5-carboxylic acid methyl ester, 3-methylpyrazole-5-carboxylic acid ethyl ester, 3, Pyrazole compounds such as 5-methylpyrazoledicarboxylic acid can be exemplified.
[0018]
Specific examples of the triazole compound include, for example, 1,2,3-triazole, 1,2,4-triazole, 3-n-butyl-1,2,4-triazole, 3,5-dimethyl-1,2,4 -Triazole, 3,5-di-n-butyl-1,2,4-triazole, 3-mercapto-1,2,4-triazole, 3-amino-1,2,4-triazole, 4-amino-1 , 2,4-triazole, 3,5-diamino-1,2,4-triazole, 5-amino-3-mercapto-1,2,4-triazole, 3-amino-5-phenyl-1,2,4 -Triazole, 3,5-diphenyl-1,2,4-triazole, 1,2,4-triazol-3-one, urazole (3,5-dioxy-1,2,4-triazole), 1,2,2 4-triazole-3 Carboxylic acid, 1-hydroxybenzotriazole, 5-hydroxy-7-methyl-1,3,8-triazaindolizine, 1H-benzotriazole, 4-methyl-1H-benzotriazole, 5-methyl-1H-benzotriazole And the like.
[0019]
Examples of the azines include diazine compounds, triazine compounds, pyridazine compounds and the like, and among these, pyridazine compounds can be preferably used.
Specific examples of the pyridazine compound include, for example, 6-methyl-8-hydroxytriazolopyridazine, 4,5-dichloro-3-pyridazine, maleic hydrazide, 6-methyl-3-pyridazone, and the like.
Among these, azoles are preferable, and triazole compounds such as 1,2,4-triazole and 1,2,3-triazole, pyrazole compounds such as 3,5-dimethylpyrazole, and pyrazolones such as 3-methyl-5-pyrazolone. Compounds are particularly preferred.
[0020]
In the present invention, the above-mentioned azoles and azines can be used alone or in combination of two or more.
[0021]
In the present invention, in order to further enhance the deodorizing effect of the hydrazides and the like, weak acid metal salts, ammonium salts, calcium chloride, urea compounds and the like may be used in combination (Japanese Patent No. 3029825, Japanese Patent Application No. 11-168669). No.).
The hydrazides and the like are used in the form of a powder, a solution or an emulsion according to a known usage as disclosed in Japanese Patent No. 3029825 and Japanese Patent Application No. 11-168669. By dissolving a powder such as hydrazide in a solvent such as water or a suitable organic solvent, a treating agent such as hydrazide can be obtained.
As the treatment amount, for example, when the deodorized synthetic wooden building material has a plate shape, the amount of the compound such as hydrazide in the deodorized synthetic wooden building material and on the surface is 0.1 to 1000 g / m per plate surface area (one side).²0.1 to 10 g / m, especially when treated by dipping, coating or spraying², 10 g to 1000 g / m 2 when processing by addition of kneading or the like to an adhesive²Is preferable.
[0022]
The method for deodorizing a synthetic wooden building material in the present invention is a process for producing a synthetic wooden building material, or after manufacturing a synthetic wooden building material, treating hydrazides and the like, and 60 to 140 ° C, preferably 70 to 130 ° C, more preferably It is heated to a temperature of 80 to 120 ° C., whereby a deodorized synthetic wood plywood from which aldehydes such as formaldehyde have been sufficiently removed can be obtained.
[0023]
In particular,
▲ 1 ▼. Hydrazides, etc. are immersed, coated, sprayed, etc. on wooden materials such as veneers, chips, etc., and treated with an adhesive between the treated hydrazides, etc., and the wooden materials are bonded at room temperature. After the synthetic wooden building material is obtained by heating, the building material is heated to 60 to 140 ° C., preferably 70 to 130 ° C. to activate hydrazides and the like to obtain a deodorized synthetic wooden building material.
▲ 2 ▼. Hydrazides are mixed with the adhesive, and the treated adhesive such as hydrazides is interposed in a wood material such as veneer / chip, and the wood material is bonded at room temperature to obtain a synthetic wood building material. By heating this building material to 60 to 140 ° C., preferably 70 to 130 ° C., hydrazides and the like are activated, and a deodorized synthetic wooden building material is obtained.
(3). Hydrazides and the like are immersed, coated, sprayed, etc., on wood materials such as veneers and chips, and an adhesive is interposed between the treated wood materials such as hydrazides and the like. At ~ 130 ° C, hydrazides and the like are activated while adhering the woody material to obtain a deodorized synthetic woody building material.
▲ 4 ▼. Hydrazides are mixed with the adhesive, and the treated adhesive such as hydrazides is interposed between wood materials such as veneers and chips, and the wood materials are bonded at 60 to 140 ° C, preferably 70 to 130 ° C. While hydrazides are activated, a deodorant synthetic wooden building material is obtained.
▲ 5 ▼. An adhesive is interposed between wood materials such as veneers and chips, and the wood materials are bonded at room temperature to obtain a synthetic wood building material.Then, hydrazides, etc. are immersed, coated, sprayed, etc. on this building material and treated. By heating this building material to 60 to 140 ° C., preferably 70 to 130 ° C., hydrazides and the like are activated to obtain a deodorized synthetic wooden building material.
▲ 6 ▼. An adhesive is interposed between wood materials such as veneers and chips, and the wood materials are bonded at 60 to 140 ° C., preferably 70 to 130 ° C. to obtain a synthetic wood building material. Then, hydrazides and the like are added to the building material. The building material is treated by dipping, coating, spraying, and the like, and the building material is heated to 60 to 140 ° C., preferably 70 to 130 ° C. to activate hydrazides and the like, thereby obtaining a deodorized synthetic wooden building material.
▲ 7 ▼. Immediately after a synthetic wood building material is obtained by bonding a wood material such as veneer or chip with an adhesive and heating the wood material to obtain a synthetic wood building material (the surface temperature of this building material is 60 to 140 ° C., preferably 70 to 140 ° C.). While the temperature is in the range of 130 ° C. or lower), hydrazides and the like are immersed, applied, and sprayed in the building materials to activate the hydrazides and the like, thereby obtaining deodorized synthetic wooden building materials.
<8>. The above (1) to (7) are appropriately combined to obtain a deodorized synthetic wood plywood.
Various embodiments are specifically exemplified.
[0024]
Although the function of any of the above embodiments is not clear, hydrazides and the like are activated and aldehydes can be effectively removed. However, in any of the embodiments, at the time of the aldehyde removal treatment with hydrazides or the like, it is preferable that the temperature of the object at the start of the treatment is in the range of 60 to 140 ° C.
[0025]
The deodorizing method of the present invention relates to a plywood or a laminated material in which a plurality of veneers are laminated and bonded, and a strand board, a particle board, or a fiber board (insulation) formed in a plate shape by bonding chips (strands, particles, etc.). The present invention can be applied to various synthetic wooden building materials such as board, MDF and hard board), wood wool cement board, and wood chip cement board.
[0026]
Moreover, the veneer used as a raw material for producing the deodorized synthetic wood building material of the present invention can be obtained by cutting and rounding off a log, and cutting, and a chip can be obtained by cutting a log. Conventionally known ones can also be used.
Here, as the raw wood, cycad, ginkgo, yew, kaya, inumaki, nagi, inugaya, hedgehog, fir, urajiro fir, aomoritodomatsu, hirabe, okatodomatsu, aotodomatsu, togasawara, tsuga, kometsuga, zomatsu, spruce, matsuhada, matsubara , Japanese cedar, Japanese cedar, Japanese black pine, Japanese red pine, Japanese cedar, Japanese cedar, Sequoia, Metasequoia, Thai cedar, Japanese cypress, Asunaro, Hiba, Nezu, Juniperus, Conifer, Populus, Yanakul, Yamamo, etc. , Beech, Inubuna, Ubamegashi, Kunugi, Kashiwa, Mizunara, Konara, Narugashiwa, Ichigashi, Tamo, Chestnut, Akinile, Harunire, Zelkova, Enoki, Mukunoki, Mulberry, Kouzo, Casinoki, Fig, Gajuma , Wig, akebi, barberry, hebino boraz, nanten, magnolia, honoki, kobushi, camphor tree, nikkei, taboki, bayberry, mansaku, suzukamoki, dogwood, ume, peach, cherry tree, karin, pear, sendan, shiraki, boxwood , Maple, china, bodaige, mukuge, sycamore, sarsberg, azalea, kokutan, chinmokusei, gimokusei, holly, olive, kiri, mahogany, african mahogany, brazilian rosewood, walnut, alder, rosewood, teak, agathis, radiata pine, nelson Hardwoods such as pine, chamelere, balsa, and lauan timber (white lauan, yellow lauan, melawan, mersawa, cruin, white Celaya, etc.) can be exemplified.
[0027]
These raw woods can be used after being boiled, steamed, etc., as necessary, before stripping in order to remove excess resin content and improve workability.
After applying the adhesive, the veneers can be bonded by laminating and pressing a plurality of veneers alternately so that the grain (fiber direction) is substantially perpendicular. Although there is no particular limitation on the number of stacked layers, it is usually preferable to stack an odd number of layers such as three, five, and seven in order to match the characteristics of the front and back sides.
[0028]
The adhesive interposed in the wood material is not particularly limited, and various wood material adhesives can be used, and thermosetting resins such as phenol resin, melamine resin, urea resin, and epoxy resin are particularly preferable. Used. These can be used alone or in combination of two or more.
After bonding, by applying pressure, wood materials such as veneers can be bonded to each other to form a synthetic wood building material such as plywood.
Such pressurization is performed at room temperature, but when a thermosetting resin is used as the adhesive, a pressurization step under heating (hot press) for curing the adhesive is provided following the pressurization at room temperature. be able to.
The heating temperature in the pressurizing step under heating is preferably equal to or higher than the curing temperature of the thermosetting resin to be used, and is set to a temperature that does not cause substantial deterioration of the woody material. A temperature of 150 ° C., preferably about 110 to 135 ° C. can be exemplified.
[0029]
If the hydrazide treatment step of the present invention is performed while the synthetic wood building material is at a temperature of 60 to 140 ° C., preferably 70 to 130 ° C. after completion of the hot pressing step, the hydrazide treatment step can be performed without providing a separate heating step. It is particularly preferable because the treatment step can be carried out and is economically excellent. However, there is no problem even after the hot press, once cooled to room temperature, and then heated again.
Further, after the hot press, once cooled to room temperature, a treatment such as attaching, spraying, applying or impregnating the hydrazide to the synthetic wooden building material may be performed, and then heating may be performed. The resulting deodorized synthetic wooden building material can be subjected to a surface treatment using a drum sander, a belt sander, or the like as necessary.
[0030]
【Example】
Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
[0031]
Example 1
The boiled yellow lauan wood was peeled off using a rotary lace, cut using a clipper, and dried to obtain a veneer. An adhesive (melamine / urea resin) was applied to the obtained veneer, and five sheets were alternately laminated so that the grain was perpendicular to each other, and then pressed once at normal temperature (20 ° C.) and a pressure of 0.98 MPa for 20 minutes. Immediately after hot pressing at 120 ° C. and 0.78 MPa for 200 seconds (surface temperature of about 120 ° C.), 4 g / scale of a 5% by weight aqueous solution of adipic hydrazide was applied to both surfaces thereof.²(44.44 g / m²) Was applied by brushing, held at room temperature for 24 hours, and dried to obtain a plywood of Example 1 having a thickness of 12 mm.
Then, this was cut into a size of 5 × 15 cm to obtain a test piece.
[0032]
Examples 2-3 and Comparative Examples 1-4
After hot pressing the laminate in the same manner as in Example 1, the laminate was cooled to room temperature (20 ° C.) to obtain a plywood having a thickness of 12 mm.
This was cut into a size of 5 × 15 cm. One of them was used as a plywood of Comparative Example 4 (untreated).
Each of the obtained pieces of plywood was allowed to stand still in a thermostat at the temperature shown in Table 1, and after confirming that the surface temperature had reached the set temperature of the thermostat, 5 weight parts of adipic dihydrazide were applied to both surfaces thereof. 4% aqueous solution²(44.44 g / m²) Was applied by brushing, held at room temperature for 24 hours and dried to obtain plywood (test pieces) of Examples 2, 3 and Comparative Examples 1 to 3.
[0033]
Test example
For the plywood obtained in the examples and comparative examples, the amount of formaldehyde emission was measured.
Measuring method
A crystal dish (120 mm in diameter, 60 mm in height) containing 300 ml of distilled water was placed on the bottom of a desiccator (having a size of 240 mm and an internal volume of about 10 l as defined in JIS R3503), and a magnetic plate was spread over the crystal dish. Ten test pieces were placed on each and left at 20 to 25 ° C. for 24 hours. The released formaldehyde was absorbed in distilled water to obtain a sample solution.
The formaldehyde concentration in the sample solution was measured by colorimetry using the photoelectric colorimeter by the acetylacetone method according to the JAS formaldehyde emission test.
Table 1 also shows the results.
[0034]
[Table 1]

[0035]
From the results in Table 1, it can be seen that the deodorized plywood of the example is a high-quality plywood in which the amount of formaldehyde emission is significantly suppressed.
[0036]
Example 4
1 part by weight of wax is added to 100 parts by weight of the wood fiber defibrated by an ordinary method, and a urea resin adhesive is applied at a ratio of 13 parts by weight to 100 parts by weight of the wood fiber containing wax. The fiber was formed into a mat by a dry method, and the pre-pressed mat was hot-pressed at a hot plate temperature of 200 ° C. and a pressure of 15.70 MPa to obtain a 12 mm thick MDF.
Immediately after hot pressing (surface temperature of about 120 ° C.), 4 g / size of 5% by weight aqueous solution of adipic dihydrazide is applied on both surfaces.²(44.44 g / m²) Was applied by brushing, and kept at room temperature for 24 hours and dried to obtain a 12 mm thick MDF of Example 4.
Then, this was cut into a size of 5 cm × 15 cm to obtain a test piece.
[0037]
Examples 5 to 6 and Comparative Examples 5 to 8
After hot-pressing the mat in the same manner as in Example 4, the mat was cooled to room temperature (20 ° C.) to obtain an MDF having a thickness of 12 mm. This was cut into a size of 5 cm × 15 cm. One of them was used as a test piece of Comparative Example 8 (untreated). Each of the obtained MDF pieces was allowed to stand still in a thermostat at the temperature shown in Table 2, and after confirming that the surface temperature had reached the set temperature of the thermostat, adipic dihydrazide 5 wt. 4% aqueous solution²(44.44 g / m²) Was applied by brushing and dried at room temperature for 24 hours to obtain MDFs (test pieces) of Examples 5, 6 and Comparative Examples 5 to 7.
[0038]
With respect to the MDF (test piece) obtained in Examples 4 to 6 and Comparative Examples 5 to 8, the emission amount of formaldehyde was measured according to the above-described test examples.
Table 2 also shows the results.
[0039]
[Table 2]

[0040]
From the results in Table 2, it can be seen that the deodorized plywood of the example is a high quality MDF in which the amount of formaldehyde emission is significantly suppressed.
[0041]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the deodorizing method of the synthetic wooden building material which concerns on this invention, aldehydes, such as formaldehyde, can be removed efficiently.
Further, according to the method for producing a deodorant synthetic wood building material according to the present invention, when treating hydrazides and the like, in order to utilize the heat that was heated when bonding the wood material with an adhesive, it was separately heated. A deodorant synthetic wooden building material with reduced emission of aldehydes can be obtained even without such a material.

Claims (5)

At the time of or after the production of synthetic wood building materials, treating at least one compound selected from hydrazides, azoles and azines (excluding those mixed with epoxy resin) at a temperature of 60 to 140 ° C. Characteristic method of deodorizing synthetic wooden building materials. At the time of or after the production of synthetic wood building materials, treating at least one compound selected from hydrazides, azoles and azines (excluding those mixed with epoxy resin) and heating to a temperature of 60 to 140 ° C. A deodorizing method for synthetic wooden building materials characterized by the following. A method of manufacturing a composite wood building materials by heating and pressing at 100 to 150 ° C. and an adhesive is interposed woody material, immediately after the pressurized heat pressure, while at a temperature of 60 to 140 ° C., A method for producing a deodorant synthetic wooden building material, comprising treating at least one compound selected from hydrazides, azoles, and azines (excluding those mixed with an epoxy resin) . Synthetic wood building material composed of wood material adhered via an adhesive, at a temperature of 60 to 140 ° C, at least one compound selected from hydrazides, azoles and azines (epoxy resin Deodorized synthetic wooden building materials, characterized in that they are treated with the exception of those mixed with deodorant. Synthetic wood building materials composed of wood materials adhered via an adhesive, wherein at least one compound selected from hydrazides, azoles and azines (excluding those mixed with epoxy resin) is treated. A deodorized synthetic wooden building material characterized by being heated to a temperature of 60 to 140 ° C. in the presence of the compound.