JP2016098243A - Paint composition for radio wave absorber and radio wave absorber - Google Patents
Paint composition for radio wave absorber and radio wave absorber Download PDFInfo
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- JP2016098243A JP2016098243A JP2014233458A JP2014233458A JP2016098243A JP 2016098243 A JP2016098243 A JP 2016098243A JP 2014233458 A JP2014233458 A JP 2014233458A JP 2014233458 A JP2014233458 A JP 2014233458A JP 2016098243 A JP2016098243 A JP 2016098243A
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 62
- 239000000203 mixture Substances 0.000 title abstract description 10
- 239000003973 paint Substances 0.000 title abstract description 5
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims abstract description 42
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 39
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 37
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims description 55
- 239000011248 coating agent Substances 0.000 claims description 54
- 239000008199 coating composition Substances 0.000 claims description 44
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 13
- 230000035699 permeability Effects 0.000 claims description 10
- 150000004760 silicates Chemical class 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000011734 sodium Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000004115 Sodium Silicate Substances 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 229910052911 sodium silicate Inorganic materials 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 229910052783 alkali metal Inorganic materials 0.000 description 4
- 150000001340 alkali metals Chemical class 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 description 4
- 229910052912 lithium silicate Inorganic materials 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229920000620 organic polymer Polymers 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 239000004111 Potassium silicate Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052913 potassium silicate Inorganic materials 0.000 description 3
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 229920000592 inorganic polymer Polymers 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910000702 sendust Inorganic materials 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
本発明は、電波吸収体用塗料組成物、及び該塗料組成物を用いて形成される塗膜からなる電波吸収体に関する。 The present invention relates to a radio wave absorber coating composition and a radio wave absorber comprising a coating film formed using the coating composition.
一般的な電波吸収体は、空気中を伝搬してきた電波を電波吸収体内部に誘導するため、電波の損失剤の配合を調整し、及び／又は形状を工夫することにより空気のインピーダンスに近づけるよう制御されている。例えば、広帯域の電波吸収体は、角錐、円錐等の形状に成形して、誘電率が急激に変化するような界面をもたないように設計されている。特に、複雑な形状を有する物の電波吸収体は、その複雑な形状に対応するために、電波吸収性能を有する塗料を用いて形成された塗膜であることが望ましい。 General radio wave absorbers guide radio waves that have propagated in the air to the inside of the radio wave absorber, so that the composition of the radio wave loss agent is adjusted and / or the shape is devised to approximate the impedance of the air. It is controlled. For example, a broadband electromagnetic wave absorber is formed into a shape such as a pyramid or a cone, and is designed so as not to have an interface whose dielectric constant changes abruptly. In particular, it is desirable that the electromagnetic wave absorber having a complicated shape is a coating film formed using a paint having a radio wave absorbing performance in order to cope with the complicated shape.
従来、電波吸収性能を有する塗料組成物として、例えば、鉄等の金属粉末を、エポキシ樹脂、ウレタン樹脂等の有機ポリマーに分散させたものが使用されている（特許文献１及び２）。 Conventionally, as a coating composition having radio wave absorption performance, for example, a metal powder such as iron dispersed in an organic polymer such as an epoxy resin or a urethane resin has been used (Patent Documents 1 and 2).
しかしながら、特許文献１及び２に記載の塗料組成物は、バインダーとして有機ポリマーを用いているために耐熱性が低く、３００℃以上の耐熱性が要求される部位、例えば、煙突の内壁のように高温になる部位、エンジン排気口周辺又はインテークダクト内のように氷結防止のために熱風が吹きかけられるような部位には使用することができなかった。 However, the coating compositions described in Patent Documents 1 and 2 have low heat resistance due to the use of an organic polymer as a binder, such as a part that requires heat resistance of 300 ° C. or higher, such as the inner wall of a chimney. It could not be used in areas where the temperature was high, such as around the engine exhaust port or in the intake duct where hot air was blown to prevent freezing.
本発明は、耐熱性に優れた電波吸収体用塗料組成物、それを用いた電波吸収体を提供することを目的とする。 An object of this invention is to provide the coating composition for electromagnetic wave absorbers excellent in heat resistance, and the electromagnetic wave absorber using the same.
本発明者らは、上記目的を達成するために鋭意研究を行った結果、塗料組成物の基材として有機ポリマーではなくケイ酸アルカリ金属塩系水ガラスを使用することにより、耐熱性に優れた塗膜（電波吸収体）が得られることを見出し、本発明を完成するに至った。 As a result of diligent research to achieve the above object, the inventors of the present invention have excellent heat resistance by using an alkali metal silicate water glass instead of an organic polymer as a base material of a coating composition. The present inventors have found that a coating film (a radio wave absorber) can be obtained, and have completed the present invention.
すなわち、本発明は、以下の電波吸収体用塗料組成物等に関する。
項１． ケイ酸アルカリ金属塩系水ガラス及び磁性損失剤を含む電波吸収体用塗料組成物であって、前記ケイ酸アルカリ金属塩系水ガラスが、１種又は２種以上のケイ酸アルカリ金属塩を含む電波吸収体用塗料組成物。
項２． 前記ケイ酸アルカリ金属塩系水ガラスが、２又は３種のケイ酸アルカリ金属塩を含む、上記項１に記載の電波吸収体用塗料組成物。
項３． 前記ケイ酸アルカリ金属塩系水ガラスが、Ｌｉ２Ｏ−Ｎａ２Ｏ−ＳｉＯ２系、Ｌｉ２Ｏ−Ｋ２Ｏ−ＳｉＯ２系、Ｎａ２Ｏ−Ｋ２Ｏ−ＳｉＯ２系、及びＬｉ２Ｏ−Ｎａ２Ｏ−Ｋ２Ｏ−ＳｉＯ２系からなる群から選択される少なくとも１種である、上記項２に記載の電波吸収体用塗料組成物。
項４． 前記塗料組成物の全量が１００重量％であるとき、前記ケイ酸アルカリ金属塩系水ガラスの含有量が１〜３０重量％であり、前記磁性損失剤の含有量が７０〜９９重量％である、上記項１〜３のいずれかに記載の電波吸収体用塗料組成物。
項５． 上記項１〜４のいずれかに記載の電波吸収体用塗料組成物を用いて形成された塗膜からなり、前記塗膜の厚みが０．１〜１０ｍｍであって、比誘電率の実数部が５〜２０であり、比誘電率の虚数部が０〜３であり、比透磁率の実数部が１〜５であり、比透磁率の虚数部が０．５〜４である、電波吸収体。
That is, this invention relates to the following coating compositions for electromagnetic wave absorbers, etc.
Item 1. A coating composition for a radio wave absorber including an alkali metal silicate water glass and a magnetic loss agent, wherein the alkali metal silicate water glass contains one or more alkali metal silicate salts. A coating composition for an electromagnetic wave absorber.
Item 2. Item 2. The coating composition for a radio wave absorber according to Item 1, wherein the alkali metal silicate water glass contains two or three alkali metal silicate salts.
Item 3. The alkali metal silicate water glass is Li 2 O—Na 2 O—SiO 2 system, Li 2 O—K 2 O—SiO 2 system, Na 2 O—K 2 O—SiO 2 system, and Li 2. it is at least one from the O-Na 2 O-K 2 O-SiO 2 the group consisting of system is selected, the wave absorber coating composition according to claim 2.
Item 4. When the total amount of the coating composition is 100% by weight, the content of the alkali metal silicate-based water glass is 1 to 30% by weight, and the content of the magnetic loss agent is 70 to 99% by weight. The coating composition for radio wave absorbers according to any one of Items 1 to 3.
Item 5. It consists of the coating film formed using the coating composition for electromagnetic wave absorbers in any one of said items 1-4, The thickness of the said coating film is 0.1-10 mm, Comprising: The real part of a dielectric constant Is 5 to 20, the imaginary part of relative permittivity is 0 to 3, the real part of relative permeability is 1 to 5, and the imaginary part of relative permeability is 0.5 to 4. body.
本発明の電波吸収体用塗料組成物は、バインダーとして水溶性無機ポリマーであるケイ酸アルカリ金属塩系水ガラスを使用しているので耐熱性に優れており、３００℃以上の高温に曝される部分にも使用することができる。よって、本発明の塗料組成物を用いて形成された塗膜からなる電波吸収体は、煙突の内壁のように高温になる部位、高温になりやすいエンジン排気口周辺又はインテークダクト内のように氷結防止のために熱風が吹きかけられる部位等において安定的に使用することができる。 The coating composition for a radio wave absorber of the present invention is excellent in heat resistance because it uses a water-soluble inorganic polymer, alkali metal silicate water glass as a binder, and is exposed to a high temperature of 300 ° C. or higher. Can also be used for parts. Therefore, a radio wave absorber composed of a coating film formed using the coating composition of the present invention is frozen at a site that becomes hot, such as the inner wall of a chimney, around an engine exhaust port that tends to become hot, or in an intake duct. It can be used stably at a site where hot air is blown for prevention.
本発明は、ケイ酸アルカリ金属系水ガラス及び磁性損失剤を含む電波吸収体用塗料組成物である。 The present invention is a coating composition for a radio wave absorber containing an alkali metal silicate water glass and a magnetic loss agent.
本発明の電波吸収体用塗料組成物は、水溶性無機ポリマーであるケイ酸アルカリ金属塩系水ガラスをバインダーとして用いることが大きな特徴である。磁性損失剤をケイ酸アルカリ金属塩系水ガラスに分散させて塗料組成物とすることにより、従来の有機ポリマーをバインダーとして使用する塗料組成物よりも耐熱性に優れた塗膜を得ることができる。 The coating composition for a radio wave absorber of the present invention is characterized by using an alkali metal silicate water glass, which is a water-soluble inorganic polymer, as a binder. By dispersing a magnetic loss agent in an alkali metal silicate-based water glass to form a coating composition, it is possible to obtain a coating film having better heat resistance than a coating composition using a conventional organic polymer as a binder. .
本発明において、ケイ酸アルカリ金属塩系水ガラスとは、ケイ酸アルカリ金属塩の高濃度水溶液のことであり、酸化ケイ素（ＳｉＯ２）とアルカリ金属炭酸塩とを融解する等の方法により製造される、粘性の大きい無色透明の液体である。ケイ酸アルカリ金属塩は、一般式［ｎＳｉＯ２・Ａ２Ｏ］（ここで、Ａはアルカリ金属を示し、ｎは正の整数である）で示され、例えば、ケイ酸リチウム、ケイ酸ナトリウム、ケイ酸カリウム、ケイ酸セシウム等を挙げることができる。 In the present invention, the alkali metal silicate-based water glass is a high-concentration aqueous solution of an alkali metal silicate, and is produced by a method such as melting silicon oxide (SiO 2 ) and alkali metal carbonate. It is a colorless and transparent liquid with high viscosity. Alkali metal silicates have the general formula [nSiO 2 · A 2 O] ( wherein, A is represents an alkali metal, n represents a positive integer) is represented by, for example, lithium silicate, sodium silicate, Examples thereof include potassium silicate and cesium silicate.
本発明で使用するケイ酸アルカリ金属系水ガラスは、１種又は２種以上のケイ酸アルカリ金属塩を含む。これらのケイ酸アルカリ金属塩の中で、ケイ酸リチウム、ケイ酸ナトリウム及びケイ酸カリウムが好ましい。 The alkali metal silicate water glass used in the present invention contains one or more alkali metal silicate salts. Of these alkali metal silicates, lithium silicate, sodium silicate and potassium silicate are preferred.
ケイ酸アルカリ金属塩系水ガラスは、２種以上のケイ酸アルカリ金属塩を含むことが好ましい。２種以上のケイ酸アルカリ金属塩を含む水ガラスをバインダーとして使用すると、高い耐熱性を有することに加えて、耐水性が向上した塗膜を得ることができる。耐水性が向上するのは、２種以上のケイ酸アルカリ金属塩を含む水ガラスでは、１種のアルカリ金属が、原子半径又はイオン半径が異なる他のアルカリ金属で置換されることが難しいため、アルカリの移動が起きにくいという、混合アルカリ効果と呼ばれる現象が起こるためであると考えられる。 The alkali metal silicate-based water glass preferably contains two or more alkali metal silicate salts. When water glass containing two or more kinds of alkali metal silicates is used as a binder, a coating film with improved water resistance can be obtained in addition to having high heat resistance. The water resistance is improved because in a water glass containing two or more alkali metal silicates, it is difficult for one alkali metal to be replaced with another alkali metal having a different atomic radius or ionic radius. It is thought that this is because a phenomenon called a mixed alkali effect occurs, in which alkali migration hardly occurs.
ケイ酸アルカリ金属塩系水ガラスが２種以上のケイ酸アルカリ金属塩を含む場合には、その１種がケイ酸リチウムであることが好ましい。リチウムのイオン半径は、ナトリウム及びカリウムと比較して著しく小さいために、極性溶媒である水との親和性が最も高いと考えられており、２種以上のケイ酸アルカリ金属塩を含む水ガラスの水が蒸発していく過程で、リチウムイオンが水と共に表層部に移動しやすく、乾燥した塗膜の最表面層がリチウムリッチなガラスとなることで、さらに耐水性が向上すると考えられる。 When the alkali metal silicate-based water glass contains two or more alkali metal silicate salts, it is preferable that one of them is lithium silicate. Since the ionic radius of lithium is significantly smaller than that of sodium and potassium, it is considered to have the highest affinity with water, which is a polar solvent, and the water glass containing two or more alkali metal silicate salts. In the process of evaporating water, lithium ions easily move to the surface layer together with water, and the outermost surface layer of the dried coating film is considered to be further improved in water resistance by becoming a lithium-rich glass.
混合アルカリ効果は、アルカリ金属の種類が多い方がその効果が高いため、ケイ酸アルカリ金属塩系水ガラスは、３種のケイ酸アルカリ金属塩を含むことがより好ましい。 Since the mixed alkali effect is more effective when the number of alkali metals is larger, it is more preferable that the alkali metal silicate-based water glass contains three types of alkali metal silicate salts.
ケイ酸アルカリ金属塩系水ガラスとして、具体的には、Ｌｉ２Ｏ−Ｎａ２Ｏ−ＳｉＯ２系、Ｌｉ２Ｏ−Ｋ２Ｏ−ＳｉＯ２系、Ｎａ２Ｏ−Ｋ２Ｏ−ＳｉＯ２系、Ｌｉ２Ｏ−Ｎａ２Ｏ−Ｋ２Ｏ−ＳｉＯ２系等が好ましい。これらの２種以上のケイ酸アルカリ金属塩を含む水ガラスにより構成される塗料組成物は、造膜性に優れていることから塗膜の膜厚を数百μｍ以上にしてもひび割れ等が生じにくく、さらに得られた塗膜は耐熱性に優れるだけでなく、耐水性にも優れている。 Specific examples of the alkali metal silicate water glass include Li 2 O—Na 2 O—SiO 2 system, Li 2 O—K 2 O—SiO 2 system, and Na 2 O—K 2 O—SiO 2 system. Li 2 O—Na 2 O—K 2 O—SiO 2 system and the like are preferable. The coating composition composed of water glass containing these two or more alkali metal silicates has excellent film forming properties, so that cracks and the like occur even when the coating film thickness is several hundred μm or more. Furthermore, the obtained coating film is excellent not only in heat resistance but also in water resistance.
磁性損失剤には、従来の電波吸収体の電磁波吸収材料として使用される磁性損失剤を制限なく使用することができる。磁性損失剤として、カルボニル鉄粉、アモルファス鉄粉等の磁性体粉末；ケイ素鋼、パーマロイ、センダスト等の金属粉末；フェライト粉末等の磁性体セラミックス粉等を挙げることができる。これらは、１種単独で又は２種以上を組み合わせて用いることができる。 As the magnetic loss agent, a magnetic loss agent used as an electromagnetic wave absorbing material of a conventional radio wave absorber can be used without limitation. Examples of the magnetic loss agent include magnetic powders such as carbonyl iron powder and amorphous iron powder; metal powders such as silicon steel, permalloy and sendust; magnetic ceramic powders such as ferrite powder. These can be used individually by 1 type or in combination of 2 or more types.
ケイ酸アルカリ金属塩系水ガラスは強い防錆作用を有することから、磁性損失剤として鉄粉等を使用する場合でも、塗膜に錆が発生しないという利点がある。 Since the alkali metal silicate-based water glass has a strong rust prevention effect, there is an advantage that rust does not occur in the coating film even when iron powder or the like is used as a magnetic loss agent.
前記ケイ酸アルカリ金属塩系水ガラス及び前記磁性損失剤の混合割合は特に限定されないが、塗料組成物の全量を１００重量％としたときに、ケイ酸アルカリ金属塩系水ガラスの含有量が１〜３０重量％であり、磁性損失剤の含有量が７０〜９９重量％とすることが好ましい。なお、本発明の塗料組成物には、前記構成成分のほかに、公知の酸化防止剤、防錆剤、分散剤、沈降防止剤等のその他の成分を、前記成分の機能を阻害しない範囲で適宜添加することができる。 The mixing ratio of the alkali metal silicate water glass and the magnetic loss agent is not particularly limited, but when the total amount of the coating composition is 100% by weight, the content of the alkali metal silicate water glass is 1. It is preferable that the content of the magnetic loss agent is 70 to 99% by weight. In addition to the above components, the coating composition of the present invention contains other components such as known antioxidants, rust inhibitors, dispersants, and antisettling agents in a range that does not hinder the function of the components. It can be added as appropriate.
本発明の塗料組成物は、前記各成分をニーダ、ボールミル、サンドミル、ロールミル、ジェットミル、ホモジナイザー等から適宜選択した混合装置を用いて分散又は混合することにより調製することができる。 The coating composition of the present invention can be prepared by dispersing or mixing the above components using a mixing device appropriately selected from a kneader, a ball mill, a sand mill, a roll mill, a jet mill, a homogenizer, and the like.
本発明の電波吸収体は、上述の塗料組成物を被塗装物に塗装し、必要に応じて乾燥処理を施し、塗膜を形成することにより得ることができる。 The radio wave absorber of the present invention can be obtained by coating the above-mentioned coating composition on an object to be coated, performing a drying treatment as necessary, and forming a coating film.
塗料組成物の塗装方法は特に限定されないが、刷毛塗り塗装、スプレー塗装、浸漬塗装、ローラー塗装等を用いることができる。複雑な形状をした被塗装面に対しても簡単に塗装できる点で、スプレー塗装が好ましい。 Although the coating method of a coating composition is not specifically limited, Brush coating, spray coating, immersion coating, roller coating, etc. can be used. Spray coating is preferable in that it can be easily applied to a surface to be coated having a complicated shape.
被塗装物の材質は、本発明の塗料組成物を塗布する面が全反射体である必要がある。例えば、金属又はカーボン繊維等の導電性樹脂で補強された複合材等の導電性を有する材料から形成されたものを被塗装物とすることができる。あるいは、被塗装物が、木材、プラスチック等の全反射体でない材料から形成されたものである場合には、その表面に金属箔等の全反射体を貼るか、又は導電性塗料を塗布して、本発明の塗料組成物を塗布する面を全反射体としたものを使用することができる。被塗装物の具体例として、飛行機の機体、煙突等が挙げられる。また、塗装面は平面でも曲面でもよい。 As for the material of the object to be coated, the surface on which the coating composition of the present invention is applied needs to be a total reflector. For example, an object to be coated can be formed from a conductive material such as a composite material reinforced with a conductive resin such as metal or carbon fiber. Alternatively, if the object to be coated is made of a material that is not a total reflector such as wood or plastic, either apply a total reflector such as a metal foil to the surface or apply a conductive paint. The surface on which the coating composition of the present invention is applied can be used as a total reflector. Specific examples of the objects to be painted include airplane bodies and chimneys. The painted surface may be flat or curved.
上述の塗料組成物を用いて塗膜を形成する際、塗膜の厚みを０．１〜１０ｍｍとし、塗膜の比誘電率の実数部が５〜２０、比誘電率の虚数部が０〜３、比透磁率の実数部が１〜５、比透磁率の虚数部が０．５〜４になるように調整する。 When forming a coating film using the above-mentioned coating composition, the thickness of the coating film is 0.1 to 10 mm, the real part of the relative dielectric constant of the coating film is 5 to 20, and the imaginary part of the relative dielectric constant is 0 to 0. 3. Adjust so that the real part of the relative permeability is 1 to 5 and the imaginary part of the relative permeability is 0.5 to 4.
本発明の電波吸収体は、優れた耐熱性を有しているので、３００℃以上の耐熱性が要求される部位、例えば、煙突の内壁のように高温になる部位、エンジン排気口周辺やインテークダクト内のように氷結防止のための熱風が吹きかけられるような部位に好適に使用することができる。 Since the radio wave absorber of the present invention has excellent heat resistance, it is necessary to have a heat resistance of 300 ° C. or higher, for example, a high temperature area such as an inner wall of a chimney, an engine exhaust port periphery or an intake. It can be suitably used for a site where hot air for preventing freezing is blown, such as in a duct.
（実施例１）
５００ｇの日産化学工業社製リチウムシリケート３５、１８８．８ｇの富士化学社製３号ケイ酸ソーダ、４７６．５ｇの日本化学工業社製２Ｋケイ酸カリウム及び１５．１ｇの日本化学工業社製水酸化ナトリウムを混合し、組成比が０．３Ｌｉ２Ｏ・０．４Ｎａ２Ｏ・０．３Ｋ２Ｏ・３ＳｉＯ２・３０Ｈ２Ｏである水ガラスを製造した。得られた０．３Ｌｉ２Ｏ・０．４Ｎａ２Ｏ・０．３Ｋ２Ｏ・３ＳｉＯ２・３０Ｈ２Ｏの組成比を有する水ガラス１００ｇに対し、カルボニル鉄粉４００ｇを混合し、撹拌することにより電波吸収塗料組成物を作製した。３００ｍｍ×３００ｍｍの鉄板に、この塗料組成物を厚みが２５０μｍとなるように塗布し、１２０℃で乾燥させた。この塗布及び乾燥を行う工程を合計１０回繰り返し、膜厚が２．０ｍｍで、比誘電率の実数部が１０．０及び虚数部が０．３、比透磁率の実数部が１．６及び虚数部が１．２である電波吸収体塗膜を作製した。得られた電波吸収体塗膜の反射減衰量を測定し、その結果を図１に示した。図１から、実施例１で得られた塗膜は、９．５ＧＨｚで２０ｄＢ以上の反射減衰量を示すことがわかった。
Example 1
500 g of Nissan Chemical Industries lithium silicate 35, 188.8 g of Fuji Chemical No. 3 sodium silicate, 476.5 g of Nippon Chemical Industry Co., Ltd. 2K potassium silicate and 15.1 g of Nippon Chemical Industry Co., Ltd. sodium are mixed and the composition ratio was prepared water glass is 0.3Li 2 O · 0.4Na 2 O · 0.3K 2 O · 3SiO 2 · 30H 2 O. By mixing and stirring 400 g of carbonyl iron powder with respect to 100 g of water glass having a composition ratio of 0.3 Li 2 O · 0.4Na 2 O · 0.3K 2 O · 3SiO 2 · 30H 2 O obtained. A radio wave absorbing coating composition was prepared. This coating composition was applied to a 300 mm × 300 mm iron plate so as to have a thickness of 250 μm, and dried at 120 ° C. This coating and drying step is repeated a total of 10 times, the film thickness is 2.0 mm, the real part of relative permittivity is 10.0 and the imaginary part is 0.3, the real part of relative permeability is 1.6 and A radio wave absorber coating film having an imaginary part of 1.2 was prepared. The reflection attenuation amount of the obtained radio wave absorber coating film was measured, and the result is shown in FIG. From FIG. 1, it was found that the coating film obtained in Example 1 exhibited a return loss of 20 dB or more at 9.5 GHz.
実施例１で作製した電波吸収体塗膜を８００℃に保持した電気炉内に１時間置いた後、外観検査及び反射減衰量の測定を行い、反射減衰量の結果を図２に示した。外観検査の結果、電波吸収体塗膜に外観上の変化は見られなかった。また、図１及び図２から、試験前後の反射減衰量に変化が見られないことから、実施例１で得られた塗膜は、８００℃まで耐熱性を持つことがわかった。 The radio wave absorber coating film produced in Example 1 was placed in an electric furnace maintained at 800 ° C. for 1 hour, and then an appearance inspection and a return loss measurement were performed. The result of the return loss is shown in FIG. As a result of the appearance inspection, no change in appearance was observed in the radio wave absorber coating film. Moreover, from FIG.1 and FIG.2, since the change was not seen in the return loss before and behind a test, it turned out that the coating film obtained in Example 1 has heat resistance to 800 degreeC.
実施例１で作製した電波吸収体塗膜に対し、塩水噴霧器により、３５℃の条件で、５％の食塩水を１０００時間噴霧し、状態を観察したところ、錆等の発生は全く無かった。また、反射減衰量の測定を行い、その結果を図３に示した。図１及び図３から、電波吸収体塗膜の試験前後の反射減衰量にも変化が見られないことから、実施例１で得られた塗膜は、塩害が起こるような状況下で使用可能であることがわかった。 The radio wave absorber coating film produced in Example 1 was sprayed with a salt water sprayer at 35 ° C. for 5 hours with 5% saline solution, and the state was observed. As a result, no rust or the like was generated. Further, the return loss was measured, and the result is shown in FIG. From FIG.1 and FIG.3, since the change in the reflection attenuation amount before and after the test of the radio wave absorber coating is not seen, the coating obtained in Example 1 can be used in a situation where salt damage occurs. I found out that
実施例１で作製した電波吸収体塗膜を８０℃、１０００ｍｌの水を張った容器に２４時間浸漬した後、フェノールフタレインのアルコール溶液を滴下したところ、変色は認められなかった。これより、実施例１で作製した電波吸収体塗膜からアルカリが溶出していないことがわかった。また、電波吸収体塗膜の外観上の変化もみられなかった。反射減衰量の測定を行い、その結果を図４に示した。図１及び図４から、試験前後の反射減衰量にも変化が見られないことから、実施例１で得られた塗膜は、良好な耐水性を持つことがわかった。 When the radio wave absorber coating film produced in Example 1 was immersed in a container filled with 1000 ml of water at 80 ° C. for 24 hours and then an alcohol solution of phenolphthalein was dropped, no discoloration was observed. From this, it was found that alkali was not eluted from the radio wave absorber coating prepared in Example 1. Further, no change in the appearance of the radio wave absorber coating was observed. The return loss was measured and the result is shown in FIG. From FIG. 1 and FIG. 4, it was found that the coating film obtained in Example 1 had good water resistance since no change was observed in the return loss before and after the test.
（実施例２）
Ｎａ２Ｏ・３ＳｉＯ２・３０Ｈ２Ｏの組成比を有するケイ酸ナトリウム系水ガラス１００ｇに対し、カルボニル鉄粉４００ｇを混合し、撹拌することにより、電波吸収塗料組成物を作製した。厚さ３００ｍｍの鉄板に、この塗料組成物を厚みが２５０μｍとなるように塗布した後に１２０℃で乾燥させた。この塗布及び乾燥を行う工程を合計１０回繰り返し、膜厚が２．０ｍｍで、比誘電率の実数部が１０．０及び虚数部が０．３、比透磁率の実数部が１．６及び虚数部が１．２である電波吸収体塗膜を作製した。この電波吸収体塗膜の反射減衰量を測定し、その結果を図５に示した。図５より、実施例２で得られた塗膜は、９．５ＧＨｚで２０ｄＢ以上の反射減衰量を示すことがわかった。
(Example 2)
To Na 2 O · 3SiO sodium silicate based waterglass 100g with 2 · 30H 2 O composition ratio of a mixture of carbonyl iron powder 400 g, by stirring, to prepare a wave absorber coating composition. This coating composition was applied to an iron plate having a thickness of 300 mm so as to have a thickness of 250 μm, and then dried at 120 ° C. This coating and drying step is repeated a total of 10 times, the film thickness is 2.0 mm, the real part of relative permittivity is 10.0 and the imaginary part is 0.3, the real part of relative permeability is 1.6 and A radio wave absorber coating film having an imaginary part of 1.2 was prepared. The reflection attenuation amount of the radio wave absorber coating film was measured, and the result is shown in FIG. From FIG. 5, it was found that the coating film obtained in Example 2 showed a return loss of 20 dB or more at 9.5 GHz.
実施例２で作製した電波吸収体塗膜についても、実施例１と同様に、８００℃に保持した電気炉内に１時間置いた後、外観検査及び反射減衰量の測定を行った。外観検査の結果、電波吸収体塗膜に外観上の変化は見られなかった。反射減衰量の結果は図示しないが、試験前後の反射減衰量に変化はなかった。これより、実施例２で得られた塗膜は、８００℃まで耐熱性を持つことがわかった。 Similarly to Example 1, the radio wave absorber coating film produced in Example 2 was placed in an electric furnace maintained at 800 ° C. for 1 hour, and then the appearance inspection and the return loss were measured. As a result of the appearance inspection, no change in appearance was observed in the radio wave absorber coating film. Although the result of the return loss is not shown, the return loss before and after the test was not changed. From this, it was found that the coating film obtained in Example 2 had heat resistance up to 800 ° C.
（比較例１）
ウレタン樹脂原料１００ｇに対し、カルボニル鉄粉８８０ｇを混合して撹拌することにより、電波吸収塗料組成物を作製した。３００ｍｍ×３００ｍｍの鉄板に、この塗料組成物を用い、実施例１と同様に塗布及び乾燥を行う工程を合計１０回繰り返し、膜厚が２．０ｍｍで、比誘電率の実数部が１０．０及び虚数部が０．３、比透磁率の実数部が１．６及び虚数部が１．２である電波吸収体塗膜を作製した。得られた電波吸収体塗膜の反射減衰量を測定し、その結果を図６に示した。図６より、比較例１で得られた塗膜は、９．５ＧＨｚで２０ｄＢ以上の反射減衰量を示すことがわかった。
(Comparative Example 1)
A radio wave absorbing coating composition was prepared by mixing 880 g of carbonyl iron powder with 100 g of urethane resin raw material and stirring. Using this coating composition on a 300 mm × 300 mm iron plate, the steps of coating and drying in the same manner as in Example 1 were repeated 10 times in total, the film thickness was 2.0 mm, and the real part of the relative dielectric constant was 10.0. A radio wave absorber coating film having an imaginary part of 0.3, a real part of relative permeability of 1.6 and an imaginary part of 1.2 was prepared. The reflection attenuation amount of the obtained radio wave absorber coating film was measured, and the result is shown in FIG. From FIG. 6, it was found that the coating film obtained in Comparative Example 1 exhibited a return loss of 20 dB or more at 9.5 GHz.
比較例１で作製した電波吸収体塗膜を塩水噴霧器により、３５℃の条件で、５％の食塩水を１０００時間噴霧し、塗膜の状態を観察したところ、試料全面に赤錆の発生が認められた。 When the radio wave absorber coating prepared in Comparative Example 1 was sprayed with a salt sprayer at 35 ° C. for 5 hours with 5% saline solution and the state of the coating was observed, red rust was observed on the entire surface of the sample. It was.
比較例１で作製した電波吸収体塗膜を３００℃に保持した電気炉内に置いたところ、直ちに煙が発生し、それとともに大きな反りが発生した。また、２００℃に保持した電気炉内に置いたところ、７分後に煙が発生し、それとともに反りが発生し始めた。 When the radio wave absorber coating film produced in Comparative Example 1 was placed in an electric furnace maintained at 300 ° C., smoke was immediately generated and a large warp was generated. When placed in an electric furnace maintained at 200 ° C., smoke was generated after 7 minutes, and warping began to occur.
これらの結果より、比較例１で得られた電波吸収体塗膜は、電波吸収性能は有するが、２００℃の温度でも分解するため、３００℃以上の耐熱性が要求される部位には使用できないことがわかる。 From these results, although the radio wave absorber coating film obtained in Comparative Example 1 has radio wave absorption performance, it decomposes even at a temperature of 200 ° C., and therefore cannot be used in a site requiring heat resistance of 300 ° C. or higher. I understand that.
（実施例２）
Ｎａ２Ｏ・３ＳｉＯ２・３０Ｈ２Ｏの組成比を有するケイ酸ナトリウム系水ガラス１００ｇに対し、カルボニル鉄粉４００ｇを混合し、撹拌することにより、電波吸収塗料組成物を作製した。３００ｍｍ×３００ｍｍの鉄板に、この塗料組成物を厚みが２５０μｍとなるように塗布した後に１２０℃で乾燥させた。この塗布及び乾燥を行う工程を合計１０回繰り返し、膜厚が２．０ｍｍで、比誘電率の実数部が１０．０及び虚数部が０．３、比透磁率の実数部が１．６及び虚数部が１．２である電波吸収体塗膜を作製した。この電波吸収体塗膜の反射減衰量を測定し、その結果を図５に示した。図５より、実施例２で得られた塗膜は、９．５ＧＨｚで２０ｄＢ以上の反射減衰量を示すことがわかった。
(Example 2)
To Na 2 O · 3SiO sodium silicate based waterglass 100g with 2 · 30H 2 O composition ratio of a mixture of carbonyl iron powder 400 g, by stirring, to prepare a wave absorber coating composition. This coating composition was applied to a 300 mm × 300 mm iron plate so as to have a thickness of 250 μm, and then dried at 120 ° C. This coating and drying step is repeated a total of 10 times, the film thickness is 2.0 mm, the real part of relative permittivity is 10.0 and the imaginary part is 0.3, the real part of relative permeability is 1.6 and A radio wave absorber coating film having an imaginary part of 1.2 was prepared. The reflection attenuation amount of the radio wave absorber coating film was measured, and the result is shown in FIG. From FIG. 5, it was found that the coating film obtained in Example 2 showed a return loss of 20 dB or more at 9.5 GHz.
Claims (5)
前記ケイ酸アルカリ金属塩系水ガラスが、１種又は２種以上のケイ酸アルカリ金属塩を含む電波吸収体用塗料組成物。 A coating composition for a radio wave absorber comprising an alkali metal silicate water glass and a magnetic loss agent,
The coating composition for a radio wave absorber, wherein the alkali metal silicate-based water glass contains one or more alkali metal silicates.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018235952A1 (en) | 2017-06-23 | 2018-12-27 | マクセルホールディングス株式会社 | Electromagnetic wave absorbing composition and electromagnetic wave absorption sheet |
| JP2019172351A (en) * | 2018-03-29 | 2019-10-10 | 株式会社フジシール | Packaging base material and package for microwave treatment |
| JP2019172340A (en) * | 2018-03-29 | 2019-10-10 | 株式会社フジシール | Packaging base material and package |
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| JPH04145169A (en) * | 1990-10-05 | 1992-05-19 | Tokiwa Denki:Kk | Coating material |
| JP2002198683A (en) * | 2000-12-25 | 2002-07-12 | Nippon Paint Co Ltd | Electromagnetic wave absorber |
| JP2003201420A (en) * | 2002-01-08 | 2003-07-18 | Shigemi Sawada | Coating and method for producing the same and article coated with the same |
| JP2005048142A (en) * | 2003-07-31 | 2005-02-24 | Nippon Sheet Glass Co Ltd | Solution for forming colored film and method for producing glass base having colored film formed by using the same |
| JP4893178B2 (en) * | 2005-09-20 | 2012-03-07 | 宇部興産株式会社 | Conductive inorganic substance-containing silicon carbide fine particles, radio wave absorber and radio wave absorber |
| JP2009013262A (en) * | 2007-07-03 | 2009-01-22 | Tosoh Corp | Composition and method for producing copper film |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018235952A1 (en) | 2017-06-23 | 2018-12-27 | マクセルホールディングス株式会社 | Electromagnetic wave absorbing composition and electromagnetic wave absorption sheet |
| JP2019172351A (en) * | 2018-03-29 | 2019-10-10 | 株式会社フジシール | Packaging base material and package for microwave treatment |
| JP2019172340A (en) * | 2018-03-29 | 2019-10-10 | 株式会社フジシール | Packaging base material and package |
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