JP2016144770A - Method for forming refractory coating layer - Google Patents

Method for forming refractory coating layer Download PDF

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JP2016144770A
JP2016144770A JP2015021836A JP2015021836A JP2016144770A JP 2016144770 A JP2016144770 A JP 2016144770A JP 2015021836 A JP2015021836 A JP 2015021836A JP 2015021836 A JP2015021836 A JP 2015021836A JP 2016144770 A JP2016144770 A JP 2016144770A
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absorbing plate
fire
sound absorbing
paint layer
resistant paint
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JP6416005B2 (en
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近藤　誠一
Seiichi Kondo
誠一 近藤
石川　義治
Yoshiharu Ishikawa
義治 石川
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NISSHIN TEKKU KK
Kumagai Gumi Co Ltd
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NISSHIN TEKKU KK
Kumagai Gumi Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a forming method for a refractory coating layer capable of improving refractory performance without deteriorating the acoustic absorption performance of a porous acoustic absorption board using a phenolic resin.SOLUTION: There is provided a method for forming a refractory coating layer comprising an aluminum silicate-based refractory coating material on the surface of a porous acoustic absorption board made by a phenolic resin. The method includes forming a refractory coating layer by spray coating, and heating and drying the porous acoustic absorption board on which the refractory coating layer is formed at a previously set prescribed heating temperature for a prescribed heating time. Thereby, the uniform refractory coating layer is formed on the surface of the porous acoustic absorption board.SELECTED DRAWING: Figure 2

Description

本発明は、フェノール樹脂を用いた多孔質吸音板の表面に耐火塗料層を形成する方法に関するものである。   The present invention relates to a method for forming a fireproof paint layer on the surface of a porous sound absorbing plate using a phenol resin.

図４は、高速道路等に設けられる従来の複合吸音パネルＰの一構成例を示す図で、複合吸音パネルＰは、コンクリート等の遮音体１の道路側の面に、第１及び第２の吸音パネル２，３を配置して、自動車の騒音を低減する。
第１及び第２の吸音パネル２，３は、金属製枠体４の天井面Ｂと床面Ｃとの間にそれぞれ取付けられおり、第１の吸音パネル２と第２の吸音パネル３の間と、遮音体１と第２の吸音パネル３との間には、第１及び第２の空気層５，６が介在している。
上記の第１及び第２の吸音パネル２，３としては、図５(ａ)に示すような、発泡ガラス、珪砂、あるいは、発泡ガラスと珪砂の混合物などから成る無機微粒子群１１をフェノール樹脂などから成る熱硬化性樹脂接着剤１２を介して板状に熱圧成形された多孔質吸音板１０や、図５（ｂ）に示すような、多孔質吸音板１０の表面１３と裏面１４とに、ガラス繊維から成る補強層１５が設けられている構成の吸音板１０Ｚなどが用いられている（例えば、特許文献１参照）。 FIG. 4 is a diagram showing a configuration example of a conventional composite sound absorbing panel P provided on an expressway or the like. The composite sound absorbing panel P is provided on the road-side surface of the sound insulating body 1 such as concrete. The sound absorbing panels 2 and 3 are arranged to reduce automobile noise.
The first and second sound absorbing panels 2 and 3 are attached between the ceiling surface B and the floor surface C of the metal frame 4, respectively, and between the first sound absorbing panel 2 and the second sound absorbing panel 3. In addition, the first and second air layers 5 and 6 are interposed between the sound insulator 1 and the second sound absorbing panel 3.
As the first and second sound absorbing panels 2 and 3, the inorganic fine particle group 11 made of foamed glass, silica sand, or a mixture of foamed glass and silica sand as shown in FIG. A porous sound-absorbing plate 10 that is hot-pressed into a plate shape through a thermosetting resin adhesive 12 made of a material, or a front surface 13 and a back surface 14 of the porous sound-absorbing plate 10 as shown in FIG. A sound absorbing plate 10Z having a configuration in which a reinforcing layer 15 made of glass fiber is provided is used (see, for example, Patent Document 1).

ところで、上記の吸音パネル２，３を、建物内装材や道路、トンネル内等で使用する場合には、不燃性を確保する必要がある。特に、接着剤として熱硬化性樹脂接着剤を用いた場合には、加熱時の発熱量が大きくなるため、吸音パネルの表面に、ロールコーティングなどにより耐火塗料を塗布して耐火塗料層を形成して、耐火性能を向上させるようにしている。   By the way, when the sound absorbing panels 2 and 3 are used in building interior materials, roads, tunnels, etc., it is necessary to ensure nonflammability. In particular, when a thermosetting resin adhesive is used as the adhesive, the amount of heat generated during heating increases, so a fire-resistant paint layer is formed on the surface of the sound-absorbing panel by applying fire-resistant paint by roll coating or the like. The fire resistance is improved.

特開平１０−３３１２８６号公報JP 10-33286 A

しかしながら、耐火塗料をロールコーティングにより塗布しても、吸音パネルの耐火性能を確保することは困難であった。
そこで、形成する耐火塗料層の厚さを厚くすることが考えられるが、層の厚さを厚くしても、耐火性能はあまり向上しないだけでなく、かえって吸音性能が低下してしまうといった問題点があった。
また、スプレー塗装により耐火塗料層を形成した場合も、耐火特性は若干向上するものの、吸音パネルの耐火性能を確保することは困難であった。 However, it has been difficult to ensure the fireproof performance of the sound absorbing panel even when the fireproof paint is applied by roll coating.
Therefore, it is conceivable to increase the thickness of the fire-resistant paint layer to be formed, but increasing the thickness of the layer will not only improve the fire resistance performance, but also reduce the sound absorption performance. was there.
Also, when the fireproof paint layer is formed by spray coating, it is difficult to secure the fireproof performance of the sound absorbing panel, although the fireproof characteristics are slightly improved.

本発明は、従来の問題点に鑑みてなされたもので、フェノール樹脂を用いた多孔質吸音板の吸音性能を低下させることなく、耐火性能を向上させることのできる耐火塗料層の形成方法を提供することを目的とする。   The present invention has been made in view of conventional problems, and provides a method for forming a fireproof coating layer that can improve fireproof performance without deteriorating sound absorbing performance of a porous sound absorbing plate using a phenol resin. The purpose is to do.

本発明は、フェノール樹脂を用いた多孔質吸音板の表面に耐火塗料層を形成する耐火塗料層の形成方法であって、前記耐火塗料層をスプレー塗装により形成する塗装ステップと、前記耐火塗料層が形成された多孔質吸音板を、予め設定された所定の加熱温度及び所定の加熱時間にて加熱乾燥処理する乾燥ステップとを有し、前記スプレー塗装される耐火塗料が珪酸アルミニウム系の耐火塗料であることを特徴とする。
これにより、多孔質吸音板の表面に均一な耐火塗料層を形成することができるので、耐火性能を十分に向上させることができる。
また、耐火塗料層の厚さを均一にできるので、耐火塗料層の厚さを必要最小限の厚さにすることができる。したがって、多孔質吸音板の吸音性能を低下させることなく、耐火性能を向上させることができる。 The present invention relates to a method for forming a fire-resistant paint layer on the surface of a porous sound absorbing plate using a phenol resin, the coating step of forming the fire-resistant paint layer by spray coating, and the fire-resistant paint layer. A drying step of heat-drying the porous sound-absorbing plate formed at a predetermined heating temperature and a predetermined heating time set in advance, and the spray-coated fire-resistant paint is an aluminum silicate-based fire-resistant paint It is characterized by being.
Thereby, since a uniform fireproof paint layer can be formed on the surface of a porous sound-absorbing board, fireproof performance can fully be improved.
In addition, since the thickness of the refractory paint layer can be made uniform, the thickness of the refractory paint layer can be reduced to the minimum necessary thickness. Therefore, the fireproof performance can be improved without deteriorating the sound absorbing performance of the porous sound absorbing plate.

また、前記塗装ステップにおいて、前記スプレー塗装を複数回に分けて行うとともに、スプレー塗装後には、前記スプレー塗装された多孔質吸音板を所定時間自然放置することで、耐火塗料層中の水分をある程度蒸散させた後に再度スプレー塗装を行うようにしたので、耐火塗料層の厚さを一層均一にすることができる。
また、珪砂を、フェノール樹脂から成る接着剤を介して板状に熱圧成形して成る多孔質吸音板や、前記多孔質吸音板の表面にガラス繊維から成る補強材が設けられているサンドイッチタイプの多孔質吸音板に、本発明に用いられる珪酸アルミニウム系の耐火塗料から成る耐火塗料層を形成したので、これら多孔質吸音板の耐火性能を確実に向上させることができる。 Further, in the coating step, the spray coating is performed in a plurality of times, and after spray coating, the spray-coated porous sound absorbing plate is allowed to stand for a predetermined period of time, so that moisture in the fireproof coating layer is kept to some extent. Since spray coating is performed again after evaporation, the thickness of the refractory paint layer can be made more uniform.
In addition, a porous sound absorbing plate formed by hot-pressing silica sand into a plate shape through an adhesive made of phenol resin, and a sandwich type in which a reinforcing material made of glass fiber is provided on the surface of the porous sound absorbing plate Since the fire-resistant paint layer made of the aluminum silicate-based fire-resistant paint used in the present invention is formed on the porous sound-absorbing board, the fire-resistant performance of these porous sound-absorbing boards can be reliably improved.

なお、前記発明の概要は、本発明の必要な全ての特徴を列挙したものではなく、これらの特徴群のサブコンビネーションもまた、発明となり得る。   The summary of the invention does not list all necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

本発明の実施の形態を示す図である。It is a figure which shows embodiment of this invention. 本実施の形態に係るスプレー塗装方法の一例を示す図である。It is a figure which shows an example of the spray coating method which concerns on this Embodiment. 耐火塗料の塗布量と２０分加熱時の総発熱量との関係を示す図である。It is a figure which shows the relationship between the application quantity of a refractory paint, and the total emitted-heat amount at the time of 20-minute heating. 従来の複合吸音パネルの一例を示す図である。It is a figure which shows an example of the conventional composite sound absorption panel. 従来の多孔質吸音板を示す図である。It is a figure which shows the conventional porous sound-absorbing board.

以下、本発明の実施の形態について、図面に基づき説明する。
図１に示すように、本発明の多孔質吸音板である耐火吸音板２０は、補強層付き多孔質吸音板（以下、補強型吸音板という）１０Ｚの表面１６と裏面１７とに、珪酸アルミニウム系の耐火塗料から成る耐火塗料層２１，２２をスプレー塗装にて形成したものである。
なお、本例の補強型吸音板１０Ｚは、発泡ガラス、珪砂、あるいは、発泡ガラスと珪砂の混合物などから成る無機微粒子群１１をフェノール樹脂などから成る熱硬化性樹脂接着剤１２を介して板状に熱圧成形された多孔質吸音板１０の表面１３と裏面１４とに、ガラス繊維から成る補強層１５を設けたもので、図５（ｂ）に示した、従来の補強型吸音板１０Ｚと同構成である。
図２に示すように、スプレー塗装工程では、補強型吸音板１０Ｚを塗装対象面である表面１６を上側にして塗装装置内に機搬し、装置内に設けられた噴射ノズルから珪酸アルミニウム系の耐火塗料を第１の所定量だけ噴射して、表面１６に塗装膜を形成する（ステップＳ１１）。
次に、塗装膜が形成された補強型吸音板１０Ｚを塗装装置から取出し、６０分間に自然乾燥（常温乾燥）させる（ステップＳ１２）。
自然乾燥後には、表面１６に塗装膜が形成された補強型吸音板１０Ｚを、表面１６を上側にして再び塗装装置内に機搬し、装置内に設けられた噴射ノズルから珪酸アルミニウム系の耐火塗料を第２の所定量だけ噴射して、表面１６に耐火塗料層２１を形成する（ステップＳ１３）。
塗装完了後には、補強型吸音板１０Ｚを塗装装置から取出した後、耐火塗料層２１が形成された補強型吸音板１０Ｚを、乾燥装置に搬送し、８０℃で８時間乾燥処理を行う（ステップＳ１４）。
乾燥処理後は、この補強型吸音板１０Ｚを裏返し、上記のステップＳ１１〜Ｓ１４と同様の行程で、補強型吸音板１０Ｚの裏面１７に耐火塗料層２２を形成することで、耐火吸音板２０を得る。
なお、耐火塗料層２１，２２の塗布量（湿重）としては、２００〜５００g/m2とすることが好ましい。
塗布量（湿重）が２００g/m2未満では、十分な耐火性能が得られない。また、塗布量（湿重）が５００g/m2を超えても耐火性能の向上の割合がそれほど向上しないだけでなく、多孔質吸音板の吸音性能が低下する恐れがあるので、耐火塗料層２１，２２の塗布量（湿重）の範囲を２００〜５００g/m2とすることが好ましい。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a fireproof sound absorbing plate 20 which is a porous sound absorbing plate of the present invention includes an aluminum silicate on a front surface 16 and a back surface 17 of a porous sound absorbing plate with a reinforcing layer (hereinafter referred to as a reinforced sound absorbing plate) 10Z. The fire-resistant paint layers 21 and 22 made of a series fire-resistant paint are formed by spray painting.
The reinforcing sound-absorbing plate 10Z of this example has a plate-like shape in which inorganic fine particle groups 11 made of foamed glass, silica sand, a mixture of foamed glass and silica sand, or the like are interposed through a thermosetting resin adhesive 12 made of phenol resin or the like. A reinforcing layer 15 made of glass fiber is provided on the front surface 13 and the back surface 14 of the porous sound-absorbing plate 10 that has been hot-pressed to the conventional sound-absorbing plate 10Z shown in FIG. It is the same composition.
As shown in FIG. 2, in the spray coating process, the reinforced sound absorbing plate 10Z is carried in a coating apparatus with the surface 16 to be coated facing upward, and an aluminum silicate-based material is injected from a spray nozzle provided in the apparatus. A fire-resistant paint is sprayed by a first predetermined amount to form a coating film on the surface 16 (step S11).
Next, the reinforced sound absorbing plate 10Z on which the coating film is formed is taken out of the coating apparatus and naturally dried (normal temperature drying) for 60 minutes (step S12).
After natural drying, the reinforced sound-absorbing plate 10Z having a coating film formed on the surface 16 is carried again into the coating apparatus with the surface 16 facing upward, and an aluminum silicate-based fireproofing is made from a spray nozzle provided in the apparatus. The paint is sprayed by a second predetermined amount to form the fireproof paint layer 21 on the surface 16 (step S13).
After the coating is completed, the reinforced sound absorbing plate 10Z is taken out from the coating device, and then the reinforced sound absorbing plate 10Z on which the fireproof paint layer 21 is formed is transported to a drying device and dried at 80 ° C. for 8 hours (step) S14).
After the drying process, the reinforced sound-absorbing plate 10Z is turned over, and the fire-resistant sound-absorbing plate 20 is formed by forming the refractory paint layer 22 on the back surface 17 of the reinforced-type sound absorbing plate 10Z in the same process as steps S11 to S14. obtain.
The application amount (wet weight) of the refractory paint layers 21 and 22 is preferably 200 to 500 g / m 2 .
When the coating amount (wet weight) is less than 200 g / m 2 , sufficient fire resistance cannot be obtained. In addition, even if the coating amount (wet weight) exceeds 500 g / m 2 , not only the improvement rate of the fireproof performance is not improved so much, but also the sound absorption performance of the porous sound absorbing plate may be lowered. , 22 is preferably 200 to 500 g / m 2 .

耐火塗料の塗装方法及び塗布量と耐火性能との関係を調べた結果を、図３（ａ）の表に示す。表では、従来例、本発明、及び、比較例を塗布量順に並べて記載した。
塗布量（g/m2)は、塗装前後の試料の重量変化から求めたもので、耐火塗料を塗布した直後（乾燥前）の値である。
耐火性能については、建築基準法施工令第１０８条の２に準拠する燃焼試験を行ない、加熱開始後２０分経過時の総発熱量(MJ/m2)により評価した。総発熱量が８MJ/m2以下であれば、不燃基準を満たしている。なお、試料の個数が２個のものは、それぞれの試料について総発熱量を算出した。
また、吸音板としては、珪砂をフェノール樹脂から成る接着剤を介して板状に熱圧成形された多孔質吸音板の表面と裏面とに、ガラス繊維から成る補強層１５が設けられた構成の補強型吸音板１０Ｚを用い、耐火塗料としては、珪酸アルミニウム系の耐火塗料（含珪酸アルミニウムポリエーテル）を用いた。なお、燃焼試験に用いた吸音板の寸法は、１００ｍｍ×１００ｍｍ×１０ｍｍである。
本発明１〜３は、補強型吸音板１０Ｚの表面１６と裏面１７とに、スプレー塗装により耐火塗料層２１，２２を形成した後、８０℃で８時間加熱乾燥処理した耐火吸音板であり、比較例１，３，５は、スプレー塗装後に自然乾燥した耐火吸音板である。なお、スプレー塗装の回数はいずれも２回である。
また、従来例、及び、比較例２，４は、耐火塗料層をロールコーティングにより形成したもので、コーティングの回数はいずれも１回である。参考例は、耐火塗料層を設けていない試料である。
図３（ａ）の表から、耐火塗料層を設けていない参考例と、塗布量が２００g/m2未満である従来例及び比較例１，２は、不燃基準を満たしていないことがわかる。
図３（ｂ）は、図３（ａ）の表をグラフ化したもので、横軸は塗布量（g/m2)、縦軸は総発熱量(MJ/m2)である。
同図に示すように、スプレー塗装の場合には、加熱乾燥処理の有無にかかわらず、塗布量が増加するにしたがって総発熱量は次第に減少し、塗布量が２００g/m2を超えると、総発熱量が不燃基準を満たすようになる。
しかしながら、自然乾燥したものでは、塗布量が２００g/m2を超えた付近から総発熱量の減少の度合いは小さくなり、総発熱量は７MJ/m2程度までしか改善されなかった。
これに対して、塗布後に加熱乾燥処理した本発明の耐火吸音板は、塗布量が４００g/m2付近まで総発熱量が減少し続けることがわかった。その結果、本発明による耐火吸音板では、塗布量を４００g/m2程度とすれば、多孔質吸音板の吸音性能が低下させることなく、発熱量を１MJ/m2程度まで改善することができることがわかった。
一方、耐火塗料層をロールコーティングにより形成した場合には、バラつきが大きく、かつ、塗布量を増加させても、総発熱量が減少していないことがわかる。
この実験により、スプレー塗装により耐火塗料層を形成した後、加熱乾燥処理することで、耐火性能に優れた耐火吸音板を得ることができることが確認された。 The result of investigating the relationship between the coating method and application amount of the fireproof paint and the fireproof performance is shown in the table of FIG. In the table, the conventional example, the present invention, and the comparative example are listed in order of coating amount.
The coating amount (g / m 2 ) is obtained from the change in the weight of the sample before and after coating, and is a value immediately after applying the fire-resistant paint (before drying).
The fire resistance was evaluated based on the total calorific value (MJ / m 2 ) after 20 minutes from the start of heating by conducting a combustion test in accordance with Article 108-2 of the Building Standards Act Construction Order. If the total calorific value is 8 MJ / m 2 or less, the non-combustibility standard is satisfied. In the case of two samples, the total calorific value was calculated for each sample.
The sound absorbing plate has a configuration in which a reinforcing layer 15 made of glass fiber is provided on the front and back surfaces of a porous sound absorbing plate formed by hot-pressing silica sand through an adhesive made of phenol resin into a plate shape. The reinforced type sound absorbing plate 10Z was used, and an aluminum silicate-based fire-resistant paint (aluminum silicate polyether) was used as the fire-resistant paint. In addition, the dimension of the sound-absorbing plate used for the combustion test is 100 mm × 100 mm × 10 mm.
The present invention 1 to 3 are fire-resistant sound absorbing plates that have been subjected to heat drying treatment at 80 ° C. for 8 hours after forming the fire-resistant paint layers 21 and 22 by spray coating on the front surface 16 and the back surface 17 of the reinforced sound absorbing plate 10Z. Comparative Examples 1, 3, and 5 are fireproof sound absorbing plates that are naturally dried after spray coating. In addition, the frequency | count of spray coating is 2 times in all.
In the conventional example and Comparative Examples 2 and 4, the fire-resistant paint layer is formed by roll coating, and the number of times of coating is one. The reference example is a sample without a fireproof paint layer.
From the table of FIG. 3A, it can be seen that the reference example in which the fire-resistant paint layer is not provided, the conventional example in which the coating amount is less than 200 g / m 2 , and the comparative examples 1 and 2 do not satisfy the incombustibility standard.
FIG. 3B is a graph of the table of FIG. 3A. The horizontal axis represents the coating amount (g / m 2 ), and the vertical axis represents the total calorific value (MJ / m 2 ).
As shown in the figure, in the case of spray coating, the total calorific value gradually decreases as the coating amount increases regardless of whether or not the heat drying treatment is performed, and when the coating amount exceeds 200 g / m 2 , The calorific value will meet non-combustible standards.
However, in the naturally dried product, the degree of decrease in the total calorific value was reduced from the vicinity where the coating amount exceeded 200 g / m 2 , and the total calorific value was improved only to about 7 MJ / m 2 .
In contrast, the heat-resistant sound absorbing plate of the present invention, which was heat-dried after coating, was found to have a reduced total heat generation until the coating amount was around 400 g / m 2 . As a result, in the fireproof sound absorbing plate according to the present invention, when the coating amount is about 400 g / m 2 , the heat generation amount can be improved to about 1 MJ / m 2 without reducing the sound absorbing performance of the porous sound absorbing plate. I understood.
On the other hand, when the refractory paint layer is formed by roll coating, it can be seen that the variation is large and the total calorific value does not decrease even when the coating amount is increased.
From this experiment, it was confirmed that a fire-resistant sound-absorbing plate having excellent fire-proof performance can be obtained by forming a fire-resistant paint layer by spray coating and then heat-drying it.

このように、本実施の形態では、補強型吸音板１０Ｚの表面に、珪酸アルミニウム系の耐火塗料から成る耐火塗料層２１，２２を形成する際に、耐火塗料層２１，２２をスプレー塗装により形成した後、耐火塗料層２１，２２が形成された補強型吸音板１０Ｚを、予め設定された所定の加熱温度及び所定の加熱時間にて加熱乾燥処理したので、補強型吸音板１０Ｚの表面に均一な耐火塗料層２１，２２が形成された耐火吸音板２０を得ることができる。したがって、補強型吸音板１０Ｚの吸音性能を低下させることなく、耐火性能を向上させることができる。   As described above, in the present embodiment, when the fireproof paint layers 21 and 22 made of the aluminum silicate fireproof paint are formed on the surface of the reinforced sound absorbing plate 10Z, the fireproof paint layers 21 and 22 are formed by spray coating. After that, the reinforced sound absorbing plate 10Z on which the fireproof paint layers 21 and 22 are formed is heat-dried at a predetermined heating temperature and a predetermined heating time, so that the surface of the reinforced sound absorbing plate 10Z is uniform. It is possible to obtain the fireproof sound absorbing plate 20 on which the fireproof paint layers 21 and 22 are formed. Therefore, the fireproof performance can be improved without reducing the sound absorption performance of the reinforced sound absorbing plate 10Z.

なお、前記実施形態では、多孔質吸音板として、図５（ｂ）に示すような、多孔質吸音板１０の表面１３と裏面１４とに、ガラス繊維から成る補強層１５が設けられている構成の吸音板１０Ｚを用いたが、図５（ａ）に示すような、補強層１５が設けられていない構成の多孔質吸音板１０を用いてもよい。
あるいは、図５（ｃ）に示すように、補強層１５に代えて、珪砂から成る第１補強層１５ａとガラス繊維から成る第２補強層１５ｂとを積層した構成の複合補強層１５Ｄを用いても、同様の効果を得ることができる。
また、前記実施形態では、スプレー塗装を２回に分けて行ったが、１回のスプレー塗装により耐火塗料層２１，２２を形成してもよい。あるいは、スプレー塗装を３回以上に分けて行ってもよい。スプレー塗装の回数は、多孔質吸音板１０や補強型吸音板１０Ｚの吸音性能等により、適宜決定すればよい。なお、スプレー塗装を複数回行う場合には、スプレー塗装後には、補強型吸音板１０Ｚを所定時間自然放置することが好ましい。
また、前記実施形態では、スプレー塗装の前処理を行わなかったが、多孔質吸音板１０や補強型吸音板１０Ｚを、例えば、４０℃〜６０℃で予備加熱するなどの前処理を行ってからスプレー塗装を行ってもよい。 In the above-described embodiment, as the porous sound absorbing plate, a reinforcing layer 15 made of glass fiber is provided on the front surface 13 and the back surface 14 of the porous sound absorbing plate 10 as shown in FIG. 5B. However, a porous sound absorbing plate 10 having a configuration in which the reinforcing layer 15 is not provided as shown in FIG. 5A may be used.
Alternatively, as shown in FIG. 5C, instead of the reinforcing layer 15, a composite reinforcing layer 15D having a configuration in which a first reinforcing layer 15a made of silica sand and a second reinforcing layer 15b made of glass fiber are laminated is used. The same effect can be obtained.
Moreover, in the said embodiment, although spray coating was performed in 2 steps, you may form the fire-resistant paint layers 21 and 22 by one spray coating. Alternatively, spray coating may be performed in three or more times. The number of spray coatings may be appropriately determined depending on the sound absorbing performance of the porous sound absorbing plate 10 and the reinforced sound absorbing plate 10Z. When spray coating is performed a plurality of times, it is preferable to leave the reinforced sound absorbing plate 10Z naturally for a predetermined time after spray coating.
Moreover, in the said embodiment, although pre-processing of spray coating was not performed, after performing pre-processing, such as preheating the porous sound-absorbing board 10 and the reinforcement type sound-absorbing board 10Z at 40 to 60 degreeC, for example. Spray painting may be performed.

また、前記実施形態では、乾燥処理における加熱温度を８０℃とし加熱時間を８時間としたが、加熱温度としては、６０℃以上１６０℃以下とすることが好ましい。これは、加熱温度が６０℃未満では均一な厚さの耐火塗料層２１，２２を形成することが困難となるからである。一方、加熱温度を１６０℃以上としても耐火特性は殆ど変わらない。したがって、加熱温度としては、６０℃以上１６０℃以下の範囲であればよい。
また、加熱時間としては、６時間以上１２時間以内であれば、均一な厚さの耐火塗料層２１，２２を形成することができるので、多孔質吸音板１０や補強型吸音板１０Ｚの吸音性能を低下させることなく、耐火性能を向上させることができる。 Moreover, in the said embodiment, although the heating temperature in a drying process was 80 degreeC and the heating time was 8 hours, as a heating temperature, it is preferable to set it as 60 to 160 degreeC. This is because it is difficult to form the fire-resistant paint layers 21 and 22 having a uniform thickness when the heating temperature is less than 60 ° C. On the other hand, even if the heating temperature is set to 160 ° C. or higher, the fire resistance characteristics hardly change. Therefore, the heating temperature may be in the range of 60 ° C. or higher and 160 ° C. or lower.
In addition, if the heating time is 6 hours or more and 12 hours or less, the refractory paint layers 21 and 22 having a uniform thickness can be formed. Therefore, the sound absorbing performance of the porous sound absorbing plate 10 and the reinforced sound absorbing plate 10Z. Fire resistance performance can be improved without lowering.

１０ 多孔質吸音板、１０Ｚ 補強層付き多孔質吸音板（補強型吸音板）、
１１ 無機微粒子群、１２ 熱硬化性樹脂接着剤、１３ 多孔質吸音板の表面、
１４ 多孔質吸音板の裏面、１５ 補強層、１６ 補強型吸音板の表面、
１７ 補強型吸音板の裏面、
２０ 耐火吸音板、２１，２２ 耐火塗料層。 10 Porous sound absorbing plate, 10Z Porous sound absorbing plate with reinforcing layer (reinforced sound absorbing plate),
11 inorganic fine particle group, 12 thermosetting resin adhesive, 13 surface of porous sound absorbing plate,
14 Back surface of porous sound absorbing plate, 15 reinforcing layer, 16 surface of reinforced sound absorbing plate,
17 The back of the reinforced sound absorbing plate,
20 Fireproof sound absorbing plate, 21,22 Fireproof paint layer.

Claims (4)

フェノール樹脂を用いた多孔質吸音板の表面に耐火塗料層を形成する耐火塗料層の形成方法であって、
前記耐火塗料層をスプレー塗装により形成する塗装ステップと、
前記耐火塗料層が形成された多孔質吸音板を、予め設定された所定の加熱温度及び所定の加熱時間にて加熱乾燥処理する乾燥ステップとを有し、
前記スプレー塗装される耐火塗料が珪酸アルミニウム系の耐火塗料であることを特徴とする耐火塗料層の形成方法。 A method for forming a fire-resistant paint layer that forms a fire-resistant paint layer on the surface of a porous sound absorbing plate using a phenol resin,
A coating step of forming the refractory paint layer by spray coating;
A drying step of heat-drying the porous sound-absorbing plate on which the fireproof paint layer is formed at a predetermined heating temperature and a predetermined heating time set in advance;
The method for forming a fire-resistant paint layer, wherein the fire-resistant paint to be spray-coated is an aluminum silicate fire-resistant paint. 前記塗装ステップでは、
前記スプレー塗装を複数回に分けて行うとともに、スプレー塗装後には、前記スプレー塗装された多孔質吸音板を所定時間自然放置することを特徴とする請求項１に記載の耐火塗料層の形成方法。 In the painting step,
The method for forming a fire-resistant paint layer according to claim 1, wherein the spray coating is performed in a plurality of times, and the spray-coated porous sound absorbing plate is allowed to stand naturally for a predetermined time after spray coating. 前記多孔質吸音板が、
珪砂を、フェノール樹脂から成る接着剤を介して板状に熱圧成形して成る多孔質吸音板であることを特徴とする請求項１または請求項２に記載の耐火塗料層の形成方法。 The porous sound absorbing plate is
The method for forming a fire-resistant paint layer according to claim 1 or 2, wherein the method is a porous sound-absorbing plate obtained by hot-pressing silica sand into a plate shape through an adhesive made of a phenol resin. 前記多孔質吸音板の表面には、ガラス繊維から成る補強層が設けられていることを特徴とする請求項３に記載の耐火塗料層の形成方法。 The method for forming a fire-resistant paint layer according to claim 3, wherein a reinforcing layer made of glass fiber is provided on the surface of the porous sound absorbing plate.
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JPS50115246A (en) * 1974-02-26 1975-09-09
EP0480072A1 (en) * 1990-04-25 1992-04-15 Takenaka Corporation Refractory coating material
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