JP2020183051A - Manufacturing method of furan polymer impregnated wood - Google Patents
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- 239000002023 wood Substances 0.000 title claims abstract description 112
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 229920000642 polymer Polymers 0.000 title claims abstract description 11
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 claims abstract description 171
- 239000007864 aqueous solution Substances 0.000 claims abstract description 50
- 238000005470 impregnation Methods 0.000 claims abstract description 39
- 239000003505 polymerization initiator Substances 0.000 claims abstract description 39
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 20
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims abstract description 12
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims abstract description 12
- 239000011976 maleic acid Substances 0.000 claims abstract description 12
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims abstract description 12
- 150000001875 compounds Chemical class 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 abstract description 16
- 239000011259 mixed solution Substances 0.000 abstract description 11
- 239000003381 stabilizer Substances 0.000 abstract description 11
- 239000000243 solution Substances 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 abstract description 3
- 230000001629 suppression Effects 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 15
- 239000007924 injection Substances 0.000 description 15
- 230000006837 decompression Effects 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 241000894007 species Species 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 240000005020 Acaciella glauca Species 0.000 description 1
- 241000218645 Cedrus Species 0.000 description 1
- 241000218691 Cupressaceae Species 0.000 description 1
- 235000018782 Dacrydium cupressinum Nutrition 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 241000256602 Isoptera Species 0.000 description 1
- 241000534018 Larix kaempferi Species 0.000 description 1
- 235000008577 Pinus radiata Nutrition 0.000 description 1
- 241000218621 Pinus radiata Species 0.000 description 1
- 235000013697 Pinus resinosa Nutrition 0.000 description 1
- 239000003377 acid catalyst Substances 0.000 description 1
- 230000002421 anti-septic effect Effects 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Abstract
Description
本発明は、フルフリルアルコールを木材に含浸させて重合させることによって得られるフランポリマー含浸木材の製造方法に関する。 The present invention relates to a method for producing furan polymer impregnated wood obtained by impregnating wood with furfuryl alcohol and polymerizing the wood.
木材は、一般に、腐食しやすく、シロアリ等の食害を受けやすく、また、ねじれ・反りが生じやすいという欠点がある。このような欠点を補うために、木材を樹脂化させて耐久性、寸法安定性を向上させる木材改質化の技術が提案されている。これらのうちの一つに、木材内で、酸を触媒（重合開始剤）としてアルコールを樹脂化させることで、木材に防腐性能、防蟻性能、寸法安定性を付与する技術が知られている。例えば、特許文献１、２には、フランポリマー含浸木材の製法が提案されている。 Wood generally has the disadvantages that it is easily corroded, easily damaged by termites and the like, and that it is easily twisted and warped. In order to make up for such a defect, a wood modification technique has been proposed in which wood is made into a resin to improve durability and dimensional stability. One of these is known as a technique for imparting antiseptic performance, anti-termite performance, and dimensional stability to wood by converting alcohol into a resin using an acid as a catalyst (polymerization initiator) in wood. .. For example, Patent Documents 1 and 2 propose a method for producing furan polymer-impregnated wood.
特許文献１に記載の製法においては、水に、フルフリルアルコール、無水マレイン酸などの重合開始剤、硼酸とリグノスルフォン酸のナトリウム塩からなる安定剤を混合させた重合性フルフリルアルコールモノマー混合液を、改質対象の木材に含浸させ、含浸後の木材を加熱乾燥して、フランポリマー含浸木材を得ている。特許文献２に記載の製法においては、水に、フルフリルアルコール、アルコールあるいはアセトンからなる安定化補助溶剤、マレイン酸などの重合開始剤を混合させた重合性フルフリルアルコールモノマー混合液を、改質対象の木材に含浸させ、含浸後の木材を加熱乾燥させて、フランポリマー含浸木材を得ている。 In the production method described in Patent Document 1, a polymerizable furfuryl alcohol monomer mixed solution in which water is mixed with a polymerization initiator such as furfuryl alcohol and maleic anhydride, and a stabilizer composed of a sodium salt of boric acid and lignosulphonic acid. Is impregnated into the wood to be reformed, and the impregnated wood is heat-dried to obtain furfuryl polymer-impregnated wood. In the production method described in Patent Document 2, a polymerizable furfuryl alcohol monomer mixed solution obtained by mixing water with a stabilizing auxiliary solvent consisting of furfuryl alcohol, alcohol or acetone, and a polymerization initiator such as maleic acid is modified. The target wood is impregnated, and the impregnated wood is heat-dried to obtain a furfuryl polymer-impregnated wood.
特許文献１、２においては、フルフリルアルコールと重合開始剤（触媒）を混ぜた時点からフルフリルアルコールの重合が開始しないように、安定化剤あるいは安定化補助剤も一緒に混合して、混合液のｐＨを中性に維持している。これにより、混合液を安定状態で保管でき、また、混合液を木材に含浸させる過程においてフルフリルアルコールの重合を抑え、木材内部にフルフリルアルコールを行き渡らせるようにしている。硬化工程（重合工程）においては、加熱乾燥等により、木材内部から安定化剤、安定化補助剤を蒸発させて除去して、フルフリルアルコールを重合させるようにしている。 In Patent Documents 1 and 2, a stabilizer or a stabilizing aid is also mixed and mixed so that the polymerization of furfuryl alcohol does not start from the time when the furfuryl alcohol and the polymerization initiator (catalyst) are mixed. The pH of the liquid is maintained at neutral. As a result, the mixed solution can be stored in a stable state, and the polymerization of furfuryl alcohol is suppressed in the process of impregnating the wood with the mixed solution, so that the furfuryl alcohol is distributed inside the wood. In the curing step (polymerization step), the stabilizer and the stabilizing aid are evaporated and removed from the inside of the wood by heating and drying to polymerize furfuryl alcohol.
このように、従来のフランポリマー含浸木材の製造方法では、フルフリルアルコールとその重合開始剤を含む水溶液に、安定剤あるいは安定化補助剤を添加して中性に保つことで、水溶液の保存性を高め、木材内部への浸透性を高めている。水溶液には、フルフリルアルコールの重合開始剤と共に、重合を抑制するための安定剤等の添加が必要である。また、木材に水溶液を含浸させた後は、フルフリルアルコールの重合を開始させるために、木材を加熱乾燥して、安定剤等を蒸発させて回収する必要がある。このため、水溶液の調製コストが掛かり、また、安定剤等を木材から蒸発させて回収するための設備コストも掛かる。 As described above, in the conventional method for producing furan polymer-impregnated wood, the storage stability of the aqueous solution is maintained by adding a stabilizer or a stabilizing aid to the aqueous solution containing furfuryl alcohol and its polymerization initiator to maintain the neutrality. And enhances the penetration into the wood. It is necessary to add a stabilizer or the like for suppressing the polymerization together with the polymerization initiator of furfuryl alcohol to the aqueous solution. Further, after the wood is impregnated with the aqueous solution, it is necessary to heat-dry the wood and evaporate the stabilizer or the like to recover the wood in order to initiate the polymerization of furfuryl alcohol. Therefore, the preparation cost of the aqueous solution is high, and the equipment cost for evaporating and recovering the stabilizer or the like from the wood is also high.
本発明の目的は、このような安定化剤、安定化補助剤を用いる必要の無いフランポリマー含浸木材の製造方法を提案することにある。 An object of the present invention is to propose a method for producing furan polymer-impregnated wood that does not require the use of such stabilizers and stabilizing aids.
上記の課題を解決するために、本発明のフランポリマー含浸木材の製造方法は、
フルフリルアルコールを含まず、前記フルフリルアルコールの重合開始剤として機能する化合物を含む第１水溶液を、処理対象の木材に含侵させる重合開始剤含浸工程、および、
重合開始剤を含まず、フルフリルアルコールを含む第２水溶液を、重合開始剤を含浸させた木材に含侵させ、フルフリルアルコールを重合させるフルフリルアルコール含浸・重合工程
を経て、フランポリマー含浸木材を製造することを特徴としている。
In order to solve the above problems, the method for producing a furan polymer-impregnated wood of the present invention is used.
A polymerization initiator impregnation step of impregnating the wood to be treated with a first aqueous solution containing a compound that does not contain furfuryl alcohol and functions as a polymerization initiator of the furfuryl alcohol, and
A second aqueous solution containing furfuryl alcohol without a polymerization initiator is impregnated into the wood impregnated with the polymerization initiator, and the furfuryl alcohol is polymerized. It is characterized by manufacturing.
重合開始剤含浸工程では、重合開始剤としてのマレイン酸と水のみを混ぜた第１水溶液、例えば、マレイン酸５ｗｔ％を含む水溶液を用いることができる。次のフルフリルアルコール含浸工程では、フルフリルアルコールと水のみを混ぜた第２水溶液、例えば、フルフリルアルコール５０ｗｔ％および水５０ｗｔ％を含む水溶液を用いることができる。 In the polymerization initiator impregnation step, a first aqueous solution in which only maleic acid and water as a polymerization initiator are mixed, for example, an aqueous solution containing 5 wt% of maleic acid can be used. In the next furfuryl alcohol impregnation step, a second aqueous solution in which only furfuryl alcohol and water are mixed, for example, an aqueous solution containing 50 wt% of furfuryl alcohol and 50 wt% of water can be used.
本発明の方法では、フルフリルアルコールを木材に含浸させる工程に先立って、その重合開始剤（酸触媒）を木材に含浸させる。これにより、フルフリルアルコールと重合開始剤との混合液を用いる場合とは異なり、重合抑制用の安定化剤等の化合物を混合液に混ぜておく必要がない。また、木材への重合開始剤の含浸と、木材へのフルフリルアルコールの含浸とが別工程で行われるので、各工程における余剰液を回収して、そのまま再利用することが容易である。 In the method of the present invention, the wood is impregnated with the polymerization initiator (acid catalyst) prior to the step of impregnating the wood with furfuryl alcohol. As a result, unlike the case where a mixed solution of furfuryl alcohol and a polymerization initiator is used, it is not necessary to mix a compound such as a stabilizer for suppressing polymerization with the mixed solution. Further, since the impregnation of the polymerization initiator into the wood and the impregnation of the furfuryl alcohol into the wood are performed in separate steps, it is easy to recover the excess liquid in each step and reuse it as it is.
重合開始剤含浸工程およびフルフリルアルコール含浸・重合工程では、含浸効率を高めるために、所定の加圧状態で各水溶液を木材に含浸させる。例えば、重合開始剤含浸工程では１５気圧の加圧下で第１水溶液を木材に含浸させる。同様に、フルフリルアルコール含浸・重合工程においても、例えば、１５気圧の加圧下で第２水溶液を木材に含浸させる。 In the polymerization initiator impregnation step and the furfuryl alcohol impregnation / polymerization step, wood is impregnated with each aqueous solution under a predetermined pressure state in order to increase the impregnation efficiency. For example, in the polymerization initiator impregnation step, wood is impregnated with the first aqueous solution under a pressure of 15 atm. Similarly, in the furfuryl alcohol impregnation / polymerization step, for example, the wood is impregnated with the second aqueous solution under a pressure of 15 atm.
ここで、木材の芯の部分等において、フルフリルアルコールの未浸潤部分（無垢部分）が残ると、その部分が寸法安定化出来ず、木材全体が湿度により寸法変化するので寸法安定性が落ちる。また、未浸潤部分（無垢部分）に傷などが生じやすいので、そこに雨水や腐朽菌が侵入して腐朽しやすい。さらに、未浸潤部分（無垢部分）があると、木材を切断した時に着色部分がまばらに見えるため、木口のタッチアップなど再塗装の必要が出てくる。 Here, if an uninfiltrated portion (solid portion) of furfuryl alcohol remains in the core portion of the wood or the like, the dimensional stability of the portion cannot be stabilized and the dimensional stability of the entire wood changes due to humidity, so that the dimensional stability is lowered. In addition, since the uninfiltrated part (solid part) is liable to be scratched, rainwater and rot fungi invade there and rot easily. Furthermore, if there is an uninfiltrated part (solid part), the colored part looks sparse when the wood is cut, so it becomes necessary to repaint such as touching up the end of the wood.
そこで、重合開始剤含浸工程の前に、木材を乾燥する前乾燥工程を行うことが望ましい。例えば、製材した木材を、減圧工程・加圧工程を経て乾燥させる。木材を乾燥することにより、後続の工程における重合開始剤、フルフリルアルコールの含浸性が改善され、これらを、木材内部の全体に亘って均一に含浸させることが容易になる。この結果、フランポリマー含浸木材の強度その他の特性を改善できる。 Therefore, it is desirable to perform a pre-drying step of drying the wood before the polymerization initiator impregnation step. For example, the sawn wood is dried through a decompression step and a pressurization step. By drying the wood, the impregnation property of the polymerization initiator and furfuryl alcohol in the subsequent steps is improved, and it becomes easy to impregnate these uniformly throughout the inside of the wood. As a result, the strength and other properties of the furan polymer impregnated wood can be improved.
なお、フルフリルアルコール含浸・重合工程の次に、木材を乾燥する後乾燥工程が行われる。 After the furfuryl alcohol impregnation / polymerization step, the wood is dried and then the drying step is performed.
以下に、図面を参照して、本発明を適用したフランポリマー含浸木材の製造方法を説明する。なお、以下に述べる実施の形態は一例であり、本発明の方法を当該実施の形態に限定することを意図したものではない。 Hereinafter, a method for producing a furan polymer-impregnated wood to which the present invention is applied will be described with reference to the drawings. The embodiments described below are examples, and are not intended to limit the method of the present invention to the embodiments.
図１を参照してフランポリマー含浸木材の製造工程を説明する。改質対象の木材は、例えば、国産木材の杉、桧、唐松、赤松等である。まず、木材は、製材機により、所定断面、所定長さの製材に加工される（製材工程ＳＴ１）。 The manufacturing process of the furan polymer-impregnated wood will be described with reference to FIG. The wood to be reformed is, for example, domestic wood such as cedar, cypress, karamatsu, and red pine. First, the wood is processed into a lumber having a predetermined cross section and a predetermined length by a lumbering machine (sawmill step ST1).
次に、製材加工後の木材１は、減圧・加圧下において乾燥させる（前乾燥工程ＳＴ２）。この前乾燥では、例えば、木材乾燥装置２の乾燥室２ａに入れた木材に、圧力乾燥を施す。まず、乾燥室２ａを減圧して木材１内の空気を除去しながら木材１を加熱乾燥し（減圧工程）、次に、乾燥室２ａ内を加圧状態にして木材１を加熱乾燥する（加圧工程）。処理圧力、保持時間等の処理条件は、樹種、木材寸法等に応じて適宜設定する。 Next, the timber 1 after the lumbering process is dried under reduced pressure and pressure (pre-drying step ST2). In this pre-drying, for example, the wood placed in the drying chamber 2a of the wood drying device 2 is pressure-dried. First, the drying chamber 2a is depressurized to remove the air in the wood 1, and the wood 1 is heated and dried (decompression step). Next, the inside of the drying chamber 2a is pressurized and the wood 1 is heated and dried (addition). Pressure process). Treatment conditions such as treatment pressure and holding time are appropriately set according to the tree species, wood dimensions, and the like.
前乾燥を行うために用いる加圧・減圧機能を備えた木材乾燥装置２として、例えば、ヒートコンディショナー（ヒルデブランド株式会社）を用いることができる。木材を乾燥することにより、木材の水溶液の含浸性が改善される。なお、ニュージーランド産のラジアタパインなどの木材の場合には、水溶液の含浸性が良い樹種であるので、前乾燥が不要な場合もある。 As the wood drying device 2 having a pressurizing / depressurizing function used for pre-drying, for example, a heat conditioner (Hildebrand Co., Ltd.) can be used. By drying the wood, the impregnation property of the aqueous solution of the wood is improved. In the case of wood such as radiatapine from New Zealand, pre-drying may not be necessary because it is a tree species with good impregnation property with an aqueous solution.
前乾燥後の木材１には重合開始剤含浸工程ＳＴ３が施される。重合開始剤含浸工程ＳＴ３では、重合開始剤であるマレイン酸と水の混合液である第１水溶液３を用いる。本例の第１水溶液３は、マレイン酸を水に混ぜただけの混合液であり、フルフリルアルコールその他の化合物は含まれていない。例えば、マレイン酸の混合割合は５ｗｔ％である。なお、必要に応じて、フルフリルアルコール以外の化合物を混合させることも可能である。 The pre-dried wood 1 is subjected to the polymerization initiator impregnation step ST3. In the polymerization initiator impregnation step ST3, the first aqueous solution 3 which is a mixed solution of maleic acid and water which is a polymerization initiator is used. The first aqueous solution 3 of this example is a mixed solution obtained by simply mixing maleic acid with water, and does not contain furfuryl alcohol or other compounds. For example, the mixing ratio of maleic acid is 5 wt%. If necessary, a compound other than furfuryl alcohol can be mixed.
第１水溶液３は、例えば、事前に調製されて溶液タンク４に貯留される。木材１は、加圧・減圧機能を備えた注入装置５の注入室５ａに投入される。溶液タンク４から注入室５ａに第１水溶液３を供給し、注入室５ａ内を所定の加圧状態、例えば、１５気圧の状態に所定時間に亘って維持する。これにより、第１水溶液３が木材１の内部の芯まで十分に行き渡る。この後は、余剰の第１水溶液３を回収し、注入室５ａ内を真空引きして所定の減圧状態を形成し、注入室内を、所定時間に亘ってこの状態に維持して、第１水溶液３を含浸させた木材１を乾燥させる。 The first aqueous solution 3 is prepared in advance and stored in the solution tank 4, for example. The wood 1 is put into the injection chamber 5a of the injection device 5 having a pressurizing / depressurizing function. The first aqueous solution 3 is supplied from the solution tank 4 to the injection chamber 5a, and the inside of the injection chamber 5a is maintained in a predetermined pressurized state, for example, a state of 15 atm for a predetermined time. As a result, the first aqueous solution 3 is sufficiently distributed to the inner core of the wood 1. After that, the surplus first aqueous solution 3 is recovered, the inside of the injection chamber 5a is evacuated to form a predetermined depressurized state, and the injection chamber is maintained in this state for a predetermined time to maintain the first aqueous solution. The wood 1 impregnated with 3 is dried.
なお、第１水溶液３を木材１に含浸させる方法として各種の公知の方法を用いることができる。例えば、減圧加圧含浸法により、減圧工程および加圧工程を経て第１水溶液３を木材１に含浸させてもよい。いずれの場合においても、処理圧力、保持時間は、樹種、木材寸法、目標とする第１水溶液３の含浸量（注入量）などの条件に応じて適宜設定すればよい。 Various known methods can be used as a method for impregnating the wood 1 with the first aqueous solution 3. For example, the wood 1 may be impregnated with the first aqueous solution 3 through the decompression step and the pressurization step by the decompression pressure impregnation method. In any case, the treatment pressure and the holding time may be appropriately set according to the conditions such as the tree species, the wood size, and the impregnation amount (injection amount) of the target first aqueous solution 3.
次に、注入室５ａ内において、マレイン酸を含浸させて乾燥させた後の木材１に、フルフリルアルコール（ＦＡ）含浸・重合工程ＳＴ４が施される。フルフリルアルコール含浸・重合工程ＳＴ４では、フルフリルアルコールと水の混合液である第２水溶液６を用いる。本例の第２水溶液６は、フルフリルアルコールを水に混ぜただけの混合液であり、重合開始剤その他の化合物は含まれていない。例えば、第２水溶液６は、フルフリルアルコール５０ｗｔ％と水５０ｗｔ％からなる。なお、必要に応じて、重合開始剤以外の化合物を混合させることも可能である。 Next, in the injection chamber 5a, the wood 1 after being impregnated with maleic acid and dried is subjected to the furfuryl alcohol (FA) impregnation / polymerization step ST4. In the furfuryl alcohol impregnation / polymerization step ST4, the second aqueous solution 6 which is a mixed solution of furfuryl alcohol and water is used. The second aqueous solution 6 of this example is a mixed solution obtained by simply mixing furfuryl alcohol with water, and does not contain a polymerization initiator or other compounds. For example, the second aqueous solution 6 is composed of 50 wt% of furfuryl alcohol and 50 wt% of water. If necessary, a compound other than the polymerization initiator can be mixed.
第２水溶液６は、例えば、事前に調製されて溶液タンク７に貯留される。注入室５ａに、溶液タンク７から第２水溶液６を供給し、注入室５ａ内を所定の加圧状態、例えば、１５気圧の状態に所定時間に亘って維持する。これにより、第２水溶液６が木材１の内部まで十分に行き渡る。この後は、余剰の第２水溶液６を回収し、注入室５ａ内を真空引きして所定の減圧状態を形成し、注入室５ａ内を、所定時間に亘ってこの状態に維持して、第２水溶液６を含浸させた木材１を乾燥させる。 The second aqueous solution 6 is prepared in advance and stored in the solution tank 7, for example. The second aqueous solution 6 is supplied from the solution tank 7 to the injection chamber 5a, and the inside of the injection chamber 5a is maintained in a predetermined pressurized state, for example, a state of 15 atm for a predetermined time. As a result, the second aqueous solution 6 is sufficiently distributed to the inside of the wood 1. After that, the surplus second aqueous solution 6 is recovered, the inside of the injection chamber 5a is evacuated to form a predetermined depressurized state, and the inside of the injection chamber 5a is maintained in this state for a predetermined time. 2 The wood 1 impregnated with the aqueous solution 6 is dried.
この工程において、第２水溶液６中のフルフリルアルコールは、木材１に含浸しながら、その内部に既に注入されているマレイン酸と反応して重合する。重合しながらフルフリルアルコールは木材１の各部に行き亘る。これにより、内部がフルフリルアルコールポリマー（フランポリマー）で充填された状態（樹脂化された状態）のフランポリマー含浸木材１０が得られる。 In this step, the furfuryl alcohol in the second aqueous solution 6 reacts with the maleic acid already injected into the wood 1 while impregnating the wood 1 to polymerize. While polymerizing, furfuryl alcohol spreads to each part of wood 1. As a result, the furan polymer-impregnated wood 10 in a state (resinized state) in which the inside is filled with the furfuryl alcohol polymer (furan polymer) is obtained.
なお、この工程においても、第２水溶液６を木材１に含浸させる方法として各種の公知の方法を用いることができる。例えば、減圧加圧含浸法により、減圧工程および加圧工程を経て第２水溶液６を木材１に含浸させてもよい。処理圧力、保持時間は、樹種、木材寸法、目標とする第２水溶液６の含浸量（注入量）などの条件に応じて適宜設定すればよい。 Also in this step, various known methods can be used as a method for impregnating the wood 1 with the second aqueous solution 6. For example, the wood 1 may be impregnated with the second aqueous solution 6 through the depressurization step and the pressurization step by the decompression pressure impregnation method. The processing pressure and holding time may be appropriately set according to conditions such as the tree species, wood size, and the target impregnation amount (injection amount) of the second aqueous solution 6.
この後、フランポリマー含浸木材１０には、後乾燥工程ＳＴ５が施される。後乾燥工程ＳＴ５では、前乾燥工程ＳＴ２と同様に、加圧・減圧機能を備えた木材乾燥装置８を用いて、例えば、減圧下で１００℃の温度状態で、フランポリマー含浸木材１０を乾燥する。減圧下での乾燥では沸点が下がり、より低い加熱温度で乾燥ができるので、乾燥時間・費用の削減に有利である。 After this, the furan polymer impregnated wood 10 is subjected to a post-drying step ST5. In the post-drying step ST5, as in the pre-drying step ST2, the furan polymer-impregnated wood 10 is dried under reduced pressure, for example, at a temperature of 100 ° C. using a wood drying device 8 having a pressurizing / depressurizing function. .. Drying under reduced pressure lowers the boiling point and allows drying at a lower heating temperature, which is advantageous in reducing the drying time and cost.
なお、乾燥後のフランポリマー含浸木材１０は、木材成形機に掛けて、所定の寸法・形状となるように成形される（成形工程ＳＴ６）。木材成形機は、例えば、ヴァイニッヒモルダー（ミカエル・ヴァイニッヒ・ジャパン株式会社）を用いることができる。 The dried furan polymer-impregnated wood 10 is placed in a wood molding machine and molded to have a predetermined size and shape (molding step ST6). As the wood molding machine, for example, Weinig Moulder (Michael Weinich Japan Co., Ltd.) can be used.
ＳＴ１ 製材工程
ＳＴ２ 前乾燥工程
ＳＴ３ 重合開始剤含浸工程
ＳＴ４ フルフリルアルコール含浸・重合工程
ＳＴ５ 後乾燥工程
ＳＴ６ 成形工程
１ 木材
２ 木材乾燥装置
２ａ 乾燥室
３ 第１水溶液
４ 溶液タンク
５ 注入装置
５ａ 注入室
６ 第２水溶液
７ 溶液タンク
８ 木材乾燥装置
１０ フランポリマー含浸木材
ST1 Sawmilling process ST2 Pre-drying process ST3 Polymerization initiator impregnation process ST4 Full frill alcohol impregnation / polymerization process ST5 Post-drying process ST6 Molding process 1 Wood 2 Wood drying device 2a Drying chamber 3 First aqueous solution 4 Solution tank 5 Injection device 5a Injection chamber 6 Second aqueous solution 7 Solution tank 8 Wood drying device 10 Francopolymer-impregnated wood
Claims (6)
前記重合開始剤を含まず、前記フルフリルアルコールを含む第２水溶液を、前記重合開始剤を含浸させた前記木材に含侵させ、前記フルフリルアルコールを重合させるフルフリルアルコール含浸・重合工程と、
を含むフランポリマー含浸木材の製造方法。 A polymerization initiator impregnation step of impregnating the wood to be treated with a first aqueous solution containing a compound that does not contain furfuryl alcohol and functions as a polymerization initiator of the furfuryl alcohol.
A furfuryl alcohol impregnation / polymerization step of impregnating the wood impregnated with the polymerization initiator with a second aqueous solution containing the furfuryl alcohol without the polymerization initiator to polymerize the furfuryl alcohol.
A method for producing furan polymer impregnated wood, including.
前記フルフリルアルコール含浸・重合工程では、フルフリルアルコールと水のみを混ぜた前記第２水溶液を前記木材に含浸させる
請求項１に記載のフランポリマー含浸木材の製造方法。 In the polymerization initiator impregnation step, the wood is impregnated with the first aqueous solution in which only maleic acid as the polymerization initiator and water are mixed.
The method for producing furfuryl polymer-impregnated wood according to claim 1, wherein in the furfuryl alcohol impregnation / polymerization step, the wood is impregnated with the second aqueous solution in which only furfuryl alcohol and water are mixed.
前記フルフリルアルコール含浸・重合工程では、フルフリルアルコール５０ｗｔ％を含む前記第２水溶液を前記木材に含浸させる
請求項２に記載のフランポリマー含浸木材の製造方法。 In the polymerization initiator impregnation step, the wood is impregnated with the first aqueous solution containing 5 wt% of maleic acid.
The method for producing furan polymer-impregnated wood according to claim 2, wherein in the furfuryl alcohol impregnation / polymerization step, the wood is impregnated with the second aqueous solution containing 50 wt% of furfuryl alcohol.
前記フルフリルアルコール含浸・重合工程では、１５気圧下で前記第２水溶液を前記木材に含浸させる
請求項１、２または３に記載のフランポリマー含浸木材の製造方法。 In the polymerization initiator impregnation step, the wood is impregnated with the first aqueous solution under 15 atm.
The method for producing a furan polymer-impregnated wood according to claim 1, 2 or 3, wherein in the furfuryl alcohol impregnation / polymerization step, the wood is impregnated with the second aqueous solution under 15 atm.
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| WO2023145902A1 (en) * | 2022-01-28 | 2023-08-03 | 富士岡山運搬機株式会社 | Method for producing modified wooden material, 5-hmf resinification solution, and modified wooden material |
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