TWI386441B - Electromagnetic wave absorber containing iron powder and its preparation method - Google Patents
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本發明係有關於一種電磁波吸收物及其製備方法，特別是指一種含鐵粉之電磁波吸收物及其製備方法，其係應用於吸收電磁波之領域。The invention relates to an electromagnetic wave absorber and a preparation method thereof, in particular to an electromagnetic wave absorber containing iron powder and a preparation method thereof, which are applied to the field of absorbing electromagnetic waves.
中華民國專利469283中申明之介電性電磁波吸收材料之製造方法是於液態聚胺基甲酸脂(PU)樹脂中添加導電碳黑、碳粉、導電纖維及中空玻璃球(microbal loons)，經兩階段特殊裝置混合成漿狀半成品，再將半成品以適當模具製成電磁波吸收材，但該製造方法因混合後之藥漿(slurry)黏度大首先以樹脂混合部份碳黑以特殊設計的3000－6000rpm高速研磨機分散，再添加碳粉、導電纖維及中空球此時藥漿黏度大增，改用300－600rpm低速高黏度攪拌機充分混合後再塗佈成試片，具有製程及設備較繁複之缺點。中華民國專利567643中申明之改良型Salisbury Screen式電磁波吸收材其中第一層為電性均質耗損材，第二層為低介電常數材以兩種材料複合成再加上反射層組合成之電磁波吸收材，但由於其為三層材料，故在製作上比單層材料之製程繁複。中華民國專利566077中申明以多層中空碳球含量5－50wt%混合樹脂製成電磁波吸收材，但目前多層中空碳球多為實驗室產品，價格高，也不符合大量生產之需求。The method for manufacturing a dielectric electromagnetic wave absorbing material as claimed in the Republic of China Patent No. 469283 is to add conductive carbon black, carbon powder, conductive fibers and microbal loons to a liquid polyurethane resin. The special equipment of the stage is mixed into a semi-finished product, and the semi-finished product is made into an electromagnetic wave absorbing material by a suitable mold. However, the manufacturing method is mainly because the viscosity of the mixed slurry is first mixed with a part of the carbon black by the resin. 6000rpm high-speed grinding machine disperses, then add carbon powder, conductive fiber and hollow sphere. At this time, the viscosity of the slurry is greatly increased. It is mixed with 300-600rpm low-speed high-viscosity mixer and then coated into test pieces. It has complicated process and equipment. Disadvantages. The improved Salisbury Screen type electromagnetic wave absorbing material declared in the Republic of China Patent No. 567643, wherein the first layer is an electrically homogeneous lossy material, and the second layer is a low dielectric constant material which is a composite of two materials and an electromagnetic wave combined with a reflective layer. Absorbent material, but because it is a three-layer material, it is more complicated to manufacture than a single-layer material. The Republic of China Patent No. 566077 states that an electromagnetic wave absorbing material is made of a mixed resin having a multi-layer hollow carbon sphere content of 5 to 50% by weight. However, at present, the multilayer hollow carbon sphere is mostly a laboratory product, and the price is high, which does not meet the demand for mass production.
且目前一些電磁波吸收材使用之鐵粉主要為球狀之羰基鐵粉，平均粒徑約1－10 Microns，鐵粉比重高且球狀鐵粉的視密度大，在含球狀鐵粉的電磁波吸收材配方裡鐵粉添加量要大於70%重量百分比才能做出具10dB反射損失的材料，因此造成電磁波吸收材單位面積重量太高，不符合目前科技產業對材料輕、薄之需求。At present, the iron powder used in some electromagnetic wave absorbing materials is mainly spherical carbonyl iron powder, the average particle diameter is about 1-10 Microns, the iron powder has a high specific gravity and the spherical iron powder has a large apparent density, and the electromagnetic wave containing the spherical iron powder. The amount of iron powder added in the absorbent material formula should be greater than 70% by weight to make a material with 10dB reflection loss. Therefore, the weight per unit area of the electromagnetic wave absorbing material is too high, which does not meet the current demand for light and thin materials in the technology industry.
綜合上述，本發明人提供一種含鐵粉之電磁波吸收物及其製備方法，其能解決習知技術製程及設備較繁複、價格高不符合大量生產之需求及電磁波吸收材單位面積重量太高，不符合科技產業對材料輕、薄之需求的缺 點。In summary, the present inventors provide an electromagnetic wave absorbing material containing iron powder and a preparation method thereof, which can solve the problem that the conventional technical process and equipment are complicated, the price is high, the mass production is not met, and the unit weight of the electromagnetic wave absorbing material is too high. Does not meet the lack of demand for light and thin materials in the technology industry point.
本發明之主要目的，在於提供一種含鐵粉之電磁波吸收物及其製備方法，該含鐵粉之電磁波吸收物單位面積重量較低，故能滿足科技產業材料輕、薄之需求。The main object of the present invention is to provide an electromagnetic wave absorbing material containing iron powder and a preparation method thereof, wherein the electromagnetic wave absorbing material of the iron powder has a low basis weight, thereby meeting the demand for light and thin materials in the science and technology industry.
本發明之另一目的，在於提供一種含鐵粉之電磁波吸收物及其製備方法，該含鐵粉之電磁波吸收物之製備方法具有製程及所需設備簡單之優點。Another object of the present invention is to provide an electromagnetic wave absorbing material containing iron powder and a preparation method thereof, and the method for preparing the electromagnetic wave absorbing material containing iron powder has the advantages of a process and a simple equipment.
本發明之又一目的，在於提供一種含鐵粉之電磁波吸收物及其製備方法，其價格較低，故能符合大量生產之需求。Another object of the present invention is to provide an electromagnetic wave absorbing material containing iron powder and a preparation method thereof, which are low in price and can meet the demand for mass production.
本發明提供一種含鐵粉之電磁波吸收物及其製備方法。該含鐵粉之電磁波吸收物，其包括：40~70重量百分率之樹脂；及30~60重量百分率之鐵粉；其中該鐵粉之視密度為0.5~0.8 g/cc。 該含鐵粉之電磁波吸收物之製備方法，其步驟包括：(1)將液態樹脂和鐵粉混合均勻；及(2)熟化冷卻後，即得到含鐵粉之電磁波吸收物；其中該鐵粉之視密度為0.5~0.8 g/cc。The invention provides an electromagnetic wave absorber containing iron powder and a preparation method thereof. The iron powder-containing electromagnetic wave absorbing material comprises: 40 to 70% by weight of a resin; and 30 to 60% by weight of iron powder; wherein the iron powder has an apparent density of 0.5 to 0.8 g/cc. The method for preparing the electromagnetic wave absorbing material containing iron powder comprises the steps of: (1) uniformly mixing the liquid resin and the iron powder; and (2) obtaining the electromagnetic wave absorbing material containing the iron powder after the aging is cooled; wherein the iron powder The apparent density is 0.5~0.8 g/cc.
茲為使 貴審查委員對本發明之技術特徵及所達成之功效更有進一步之瞭解與認識，謹佐以較佳之實施例圖及配合詳細之說明，說明如後：In order to give the reviewer a better understanding and understanding of the technical features of the present invention and the efficacies achieved, the following is a description of the preferred embodiment and a detailed description.
本發明含鐵粉之電磁波吸收物，其包括：40~70重量百分率之樹脂；及30~60重量百分率之鐵粉。The electromagnetic wave absorber of the iron powder of the present invention comprises: 40 to 70% by weight of the resin; and 30 to 60% by weight of the iron powder.
其中該鐵粉為珊瑚狀或鹿角狀，該鐵粉之視密度為0.5~0.8 g/cc及該鐵粉之平均粒徑為30~60μm。該鐵粉之較佳視密度為0.53 g/cc及較佳之平均粒徑為43.0μm。The iron powder is coral-like or staghorn-shaped, and the apparent density of the iron powder is 0.5-0.8 g/cc and the average particle diameter of the iron powder is 30-60 μm. The iron powder preferably has an apparent density of 0.53 g/cc and preferably has an average particle diameter of 43.0 μm.
其中該樹脂係選自環氧樹脂、聚胺基甲酸脂樹脂、聚甲基丙烯酸酯樹脂、矽樹脂及聚酯樹脂所組成之群組之其中之一者。且該鐵粉較 佳之重量百分率為42~50%。The resin is one selected from the group consisting of epoxy resins, polyurethane resins, polymethacrylate resins, enamel resins, and polyester resins. And the iron powder is The weight percentage of good is 42~50%.
本發明含鐵粉之電磁波吸收物之製備方法，其步驟包括(如第一圖所示)：S11將液態樹脂和鐵粉混合均勻得到含鐵粉之電磁波吸收組成物；及S12熟化冷卻後，即得到含鐵粉之電磁波吸收物。The method for preparing an electromagnetic wave absorbing material containing iron powder according to the present invention comprises the following steps (as shown in the first figure): S11 is a mixture of a liquid resin and an iron powder to obtain an electromagnetic wave absorbing composition containing iron powder; and after S12 is matured and cooled, That is, an electromagnetic wave absorbing material containing iron powder is obtained.
其中該鐵粉為珊瑚狀或鹿角狀。The iron powder is coral or staghorn.
其中該含鐵粉之電磁波吸收物包括40~70重量百分率之樹脂及30~60重量百分率之鐵粉。The electromagnetic wave absorbing material containing the iron powder comprises 40 to 70% by weight of the resin and 30 to 60% by weight of the iron powder.
其中步驟S11後更包括一灌入模具之步驟。Step S11 further includes a step of filling the mold.
其中該含鐵粉之電磁波吸收物之厚度為0.5~5.0mm，且在2~18GHz之頻率範圍具有10dB以上之反射損失。The electromagnetic wave absorbing material of the iron powder has a thickness of 0.5 to 5.0 mm and a reflection loss of 10 dB or more in a frequency range of 2 to 18 GHz.
其中該含鐵粉之電磁波吸收物之較佳厚度為1~4.5mm。The electromagnetic wave absorbing material containing the iron powder preferably has a thickness of 1 to 4.5 mm.
本發明使用之珊瑚狀鐵粉其SEM圖像如第二圖所示，製作方法為以草酸鐵為原料於500~800℃以氫氣還原2~4小時而得，外觀形狀如珊瑚或鹿角之長條多角狀，視密度為0.5~0.8g/cc，以Coulter LS－230雷射粒徑分析儀測量，平均粒程為30~60μm。The SEM image of the coral-like iron powder used in the present invention is as shown in the second figure, and the preparation method is that the iron oxalate is used as a raw material to reduce hydrogen gas at 500 to 800 ° C for 2 to 4 hours, and the appearance shape is long such as coral or antler. The strip has a polygonal shape with an apparent density of 0.5-0.8 g/cc and is measured by a Coulter LS-230 laser particle size analyzer with an average particle size of 30-60 μm.
本發明之較佳實施例於環氧樹脂中添加珊瑚狀鐵粉(本發明所製作的原料產品，編號T2,視密度0.53g/cc，平均粒程43.0μm)及比較例係於環氧樹脂中添加幾基鐵粉作填料，再以一般三滾筒機(滾筒之間隙為0.1mm)來混料使藥漿混合均勻後，將藥漿倒入15 cm×l5 cm金屬模子中，上下放鋁板，以夾子夾住，以80℃烘2小時後取出，冷卻後除去鋁板將電磁波吸收材成品取出，經修飾後量測厚度、重量。In a preferred embodiment of the present invention, a coral-like iron powder (a raw material produced by the present invention, No. T2, apparent density 0.53 g/cc, average particle size 43.0 μm) and a comparative example in epoxy resin are added to the epoxy resin. Add a few base iron powder as a filler, and then mix the slurry with a general three-roller machine (the gap of the roller is 0.1mm), then pour the slurry into a 15 cm×l5 cm metal mold, and place the aluminum plate up and down. The sample was clamped, and dried at 80 ° C for 2 hours, and then taken out. After cooling, the aluminum plate was removed to take out the electromagnetic wave absorbing material, and the thickness and weight were measured after modification.
微波反射損失(Retum Loss)量測方法採用自由空間(free space)測試法，頻率範圍(2－18GHz)，使用微波網路分析儀HP8722ES及Damaskos公司free space量測夾具，以相同試片大小15cm×15cm金屬片放上待測 位置，先校正水平，調整天線入射角度(21∘)測原始反射量，接著換試片並以該金屬片當反射面再量測試片之反射損失衰減強度，反射損失愈大代表電磁波吸收效果愈好。The microwave reflection loss (Retum Loss) measurement method uses the free space test method, the frequency range (2-18 GHz), using the microwave network analyzer HP8722ES and the Damaskos free space measurement fixture, with the same test piece size 15cm ×15cm metal piece put on test Position, first correct the level, adjust the antenna incident angle (21 ∘) to measure the original reflection amount, then change the test piece and use the metal piece as the reflection surface to measure the reflection loss attenuation intensity of the test piece. The greater the reflection loss, the more the electromagnetic wave absorption effect is. it is good.
為更詳細描述本發明，以下特舉幾個實施例及比較例說明如後。表一為本發明實施例及比較例使用之磁性填充料的來源及規格：
將50.0g液態環氧樹脂及珊瑚狀鐵粉50.0g加入250ml混料容器中(總配料量100g)，先以攪拌棒攪拌1－2分鐘，再以一般三滾筒機來混料5次使藥漿混合均勻後，取70.0g藥漿，將藥漿倒入15 cm×15 cm金屬模子中，以80℃烘2小時後取出試片，經修飾後量測重量為60.0g，厚度為1.5mm，單位面積重量為2.7Kg/mxm，微波反射損失量測如第三圖所示，高峰值在10.0GHz，其反射損失為14.4dB。50.0g liquid epoxy resin and coral iron powder 50.0g were added to a 250ml mixing container (total dosage 100g), first stirred with a stir bar for 1-2 minutes, and then mixed with a general three-roller machine for 5 times. After the slurry was uniformly mixed, 70.0 g of the slurry was taken, and the slurry was poured into a 15 cm × 15 cm metal mold, and the test piece was taken out after drying at 80 ° C for 2 hours. After the modification, the measured weight was 60.0 g, and the thickness was 1.5 mm. The weight per unit area is 2.7 Kg/mxm, and the microwave reflection loss is measured as shown in the third figure. The high peak value is 10.0 GHz, and the reflection loss is 14.4 dB.
將60.0g液態環氧樹脂及羰基鐵粉140.0g加入250ml混料容器中(總配料量200g)，先以攪拌棒攪拌1－2分鐘，再以一般三滾筒機來混料5次使藥漿混合均勻後，取130.0g藥漿，將藥漿倒入15 cm×15 cm金屬模子中，以80℃烘2小時後取出試片，經修飾後量測重量為113.0g，厚度為2.0mm，單位面積重量為5.0Kg/mxm，微波反射損失量測如第四圖所示，高峰值在10.1GHz，其反射損失為15.6dB。Add 60.0g liquid epoxy resin and 140.0g of carbonyl iron powder to a 250ml mixing container (total dosage of 200g), stir first with a stir bar for 1-2 minutes, then mix 5 times with a general three-roller to make the slurry. After mixing well, take 130.0 g of the slurry, pour the slurry into a 15 cm × 15 cm metal mold, and dry it at 80 ° C for 2 hours, then take out the test piece. After modification, the measured weight is 113.0 g and the thickness is 2.0 mm. The weight per unit area is 5.0 Kg/mxm, and the microwave reflection loss measurement is as shown in the fourth figure. The high peak value is 10.1 GHz, and the reflection loss is 15.6 dB.
將58.0g液態環氧樹脂及珊瑚狀鐵粉42.0g加入250ml混料容器中(總配料量100g)，先以攪拌棒攪拌1－2分鐘，再以一般三滾筒機來混料5次使藥漿混合均勻後，取50.0g藥漿，將藥漿倒入15 cm×15 cm金屬模子中，以80℃烘2小時後取出試片，經修飾後量測重量為44.0g，厚度為1.1mm，單位面積重量為2.0Kg/mxm，微波反射損失量測如第五圖所示，高峰值在14.4GHz，其反射損失為16.4dB。Add 58.0g liquid epoxy resin and coral iron powder 42.0g into 250ml mixing container (total dosage 100g), stir with stirring rod for 1-2 minutes, then mix 5 times with general three-roller to make medicine After the slurry was uniformly mixed, 50.0 g of the slurry was taken, and the slurry was poured into a 15 cm × 15 cm metal mold, and the test piece was taken out after drying at 80 ° C for 2 hours. After the modification, the measured weight was 44.0 g and the thickness was 1.1 mm. The weight per unit area is 2.0 Kg/mxm, and the microwave reflection loss measurement is as shown in the fifth figure. The high peak value is 14.4 GHz, and the reflection loss is 16.4 dB.
將30.0g液態環氧樹脂及羰基鐵粉70.0g加入250ml混料容器中(總配料量100g)，先以攪拌棒攪拌1－2分鐘，再以一般三滾筒機來混料5次使藥漿混合均勻後，取85.0g藥漿，將藥漿倒入15 cm×15 cm金屬模子中，以80℃烘2小時後取出試片，經修飾後量測重量為75.0g，厚度為1.2mm，單位面積重量為3.3Kg/mxm，微波反射損失量測如第六圖所示，高峰值在15.2GHz，其反射損失為15.1dB。Add 30.0g liquid epoxy resin and 70.0g of carbonyl iron powder to 250ml mixing container (total dosage 100g), stir with stirring rod for 1-2 minutes, then mix 5 times with general three-roller to make the slurry After mixing uniformly, 85.0 g of the slurry was taken, and the slurry was poured into a 15 cm × 15 cm metal mold, and the test piece was taken out after drying at 80 ° C for 2 hours. After the modification, the measured weight was 75.0 g, and the thickness was 1.2 mm. The weight per unit area is 3.3 Kg/mxm, and the microwave reflection loss is measured as shown in the sixth figure. The high peak is at 15.2 GHz and the reflection loss is 15.1 dB.
將100.0g液態環氧樹脂及珊瑚狀鐵粉100.0g加入250ml混料容器中(總配料量200g)，先以攪拌棒攪拌1－2分鐘，再以一般三滾筒機來混料5次使藥漿混合均勻後，取130.0g藥漿，將藥漿倒入15 cm×15 cm金屬模子中，以80℃烘2小時後取出試片，經修飾後量測重量為113.0g，厚度為2.5mm，單位面積重量為5.0Kg/mxm，微波反射損失量測如第七圖所示，高峰值在6.0GHz，其反射損失為23.8dB。Add 100.0g liquid epoxy resin and coral iron powder 100.0g to 250ml mixing container (total dosage of 200g), stir with stirring rod for 1-2 minutes, then mix 5 times with general three-roller machine After the slurry was uniformly mixed, 130.0 g of the slurry was taken, and the slurry was poured into a 15 cm × 15 cm metal mold, and the test piece was taken out after drying at 80 ° C for 2 hours. After the modification, the measured weight was 113.0 g and the thickness was 2.5 mm. The weight per unit area is 5.0Kg/mxm, and the microwave reflection loss is measured as shown in the seventh figure. The high peak value is 6.0 GHz, and the reflection loss is 23.8 dB.
將60.0g液態環氧樹脂及羰基鐵粉140.0g加入250ml混料容器中(總配料量200g)，先以攪拌棒攪拌1－2分鐘，再以一般三滾筒機來混料5次使藥漿混合均勻後，取185.0g藥漿，將藥漿倒入15 cm×15 cm金屬模子中，以80℃烘2小時後取出試片，經修飾後量測重量為178.0g，厚度為3.0mm，單位面積重量為7.9Kg/mxm，微波反射損失量測如第八圖所示，高峰值在 6.0GHz，其反射損失為11.9dB。Add 60.0g liquid epoxy resin and 140.0g of carbonyl iron powder to a 250ml mixing container (total dosage of 200g), stir first with a stir bar for 1-2 minutes, then mix 5 times with a general three-roller to make the slurry. After mixing uniformly, 185.0 g of the slurry was taken, and the slurry was poured into a 15 cm × 15 cm metal mold, and the test piece was taken out after drying at 80 ° C for 2 hours. After the modification, the measured weight was 178.0 g, and the thickness was 3.0 mm. The weight per unit area is 7.9Kg/mxm, and the microwave reflection loss is measured as shown in the eighth figure. At 6.0 GHz, the reflection loss is 11.9 dB.
將100.0g液態環氧樹脂及珊瑚狀鐵粉100.0g加入250ml混料容器中(總配料量200g)，先以攪拌棒攪拌1－2分鐘，再以一般三滾筒機來混料5次很藥漿混合均勻後，取194.0g藥漿，將藥漿倒入15 cm×15 cm金屬模子中，以80℃烘2小時後取出試片，經修飾後量測重量為180.4g，厚度為4.4mm，單位面積重量為8.0Kg/mxm，微波反射損失量測如第九圖所示，高峰值在3.0GHz，其反射損失為14.5dB。Add 100.0g liquid epoxy resin and coral iron powder 100.0g to 250ml mixing container (total dosage of 200g), stir with stirring rod for 1-2 minutes, then mix 5 times with general three-roller machine. After the slurry was uniformly mixed, 194.0 g of the slurry was taken, and the slurry was poured into a 15 cm × 15 cm metal mold, and the test piece was taken out after drying at 80 ° C for 2 hours. After the modification, the measured weight was 180.4 g and the thickness was 4.4 mm. The weight per unit area is 8.0 Kg/mxm, and the microwave reflection loss measurement is as shown in the ninth figure. The high peak value is 3.0 GHz, and the reflection loss is 14.5 dB.
將120.0g液態環氧樹脂及羰基鐵粉280.0g加入500ml混料容器中(繼配料量400g)，先以攪拌棒攪拌1－2分鐘，再以一般三滾筒機來混料5次使藥漿混合均勻後，取360.0g藥漿，將藥漿倒入15 cm×15 cm金屬模子中，以80℃烘2小時後取出試片，經修飾後量測重量為344.0g，厚度為6.2mm，單位面積重量為15.3Kg/mxm，微波反射損失量測如第十圖所示，高峰值在3.0GHz，其反射損失為14.2dB。Add 120.0g liquid epoxy resin and carbonyl iron powder 280.0g into 500ml mixing container (following the dosage amount 400g), stir first with stirring rod for 1-2 minutes, then mix 5 times with general three-roller to make the slurry After mixing uniformly, 360.0 g of the slurry was taken, and the slurry was poured into a 15 cm × 15 cm metal mold, and the test piece was taken out after drying at 80 ° C for 2 hours. After the modification, the measured weight was 344.0 g and the thickness was 6.2 mm. The weight per unit area is 15.3 Kg/mxm, and the microwave reflection loss measurement is as shown in the tenth figure. The high peak value is 3.0 GHz, and the reflection loss is 14.2 dB.
表二至表五為本發明上述之實施例與比較例及英國BAE公司產品在X(8－12GHz),Ku(12－18GHz),C(4－8GHz),S(2－4GHz)相同頻段下的比較表，由表中發現在相同的頻段下實施例試片之反射損失近似或大於比較例試片之反射損失，顯示本發明含鐵粉之電磁波吸收物具有較佳的電磁波吸收效果，且實施例試片的厚度及單位面積重皆較比較例試片小許多；又，本發明實施例試片和BAE公司產品比較除S頻段厚度稍大外其餘厚度及單位面積重皆優於BAE公司產品。Tables 2 to 5 show the above-mentioned embodiments and comparative examples of the present invention and the British BAE products in the same frequency band of X (8-12 GHz), Ku (12-18 GHz), C (4-8 GHz), S (2-4 GHz). In the comparison table below, it is found in the table that the reflection loss of the test piece in the same frequency band is similar to or larger than the reflection loss of the test piece of the comparative example, and the electromagnetic wave absorption product containing the iron powder of the present invention has a better electromagnetic wave absorption effect. Moreover, the thickness and the unit area weight of the test piece are much smaller than that of the comparative test piece; in addition, the test piece and the BAE product of the embodiment of the present invention are superior to the BAE except that the thickness of the S-band is slightly larger than the BAE. company's product.
綜上所述，本發明具有以下之優點：1.本發明含鐵粉之電磁波吸收物單位面積重量較低，故能滿足科技產業材 料輕、薄之需求。In summary, the present invention has the following advantages: 1. The electromagnetic wave absorbing material of the iron powder of the present invention has a low basis weight, so that it can satisfy the technical industrial materials. Light and thin demand.
2.本發明含鐵粉之電磁波吸收物之製備方法具有製作及所需設備簡單之優點。2. The preparation method of the electromagnetic wave absorbing material containing iron powder of the present invention has the advantages of simple fabrication and required equipment.
3.本發明含鐵粉之電磁波吸收物及其製備方法，不需使用中空碳球，故其價格低廉，能符合大量生產之需求。3. The electromagnetic wave absorbing material containing iron powder of the invention and the preparation method thereof do not need to use hollow carbon spheres, so the price is low and can meet the demand of mass production.
故本發明實為一具有新穎性、進步性及可供產業上利用者，應符合我國專利法專利申請要件無疑，爰依法提出發明專利申請，祈 鈞局早日賜准專利，至感為禱。Therefore, the present invention is a novelty, progressive and available for industrial use. It should be in accordance with the requirements of patent applications for patent law in China. It is undoubtedly to file an invention patent application according to law, and the Prayer Council will grant patents as soon as possible.
惟以上所述者，僅為本發明較佳實施例而已，並非用來限定本發明實施之範圍，故舉凡依本發明申請專利範圍所述之特微及精神所為之均等變化與修飾，均應包括於本發明之申請專利範圍內。However, the above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the practice of the present invention, and the equivalent changes and modifications as described in the claims of the present invention should be It is included in the scope of the patent application of the present invention.
第一圖為本發明含鐵粉之電磁波吸收物之製備方法之步驟流程圖。The first figure is a flow chart of the steps of the preparation method of the electromagnetic wave absorber containing iron powder of the present invention.
第二圖本發明鐵粉呈珊瑚狀之SEM圖。The second figure shows the SEM image of the iron powder of the present invention.
第三圖為本發明實施例1之含鐵粉之電磁波吸收物之微波反射損失特性圖。Fig. 3 is a graph showing the microwave reflection loss characteristics of the electromagnetic wave absorber containing iron powder according to Example 1 of the present invention.
第四圖為本發明比較例1之含羰基鐵粉之電磁波吸收物之微波反射損失特性圖。Fig. 4 is a graph showing the microwave reflection loss characteristics of the electromagnetic wave absorbing material containing carbonyl iron powder of Comparative Example 1 of the present invention.
第五圖為本發明實施例2之含鐵粉之電磁波吸收物之微波反射損失特性圖。Fig. 5 is a graph showing the microwave reflection loss characteristics of the electromagnetic wave absorber containing iron powder according to Example 2 of the present invention.
第六圖為本發明比較例2之含羰基鐵粉之電磁波吸收物之微波反射損失特性圖。Fig. 6 is a graph showing the microwave reflection loss characteristics of the electromagnetic wave absorbing material containing carbonyl iron powder of Comparative Example 2 of the present invention.
第七圖為本發明實施例3之含鐵粉之電磁波吸收物之微波反射損失特性圖。Fig. 7 is a graph showing the microwave reflection loss characteristics of the electromagnetic wave absorber containing iron powder according to Example 3 of the present invention.
第八圖為本發明比較例3之含羰基鐵粉之電磁波吸收物之微波反射損失特性圖。Fig. 8 is a graph showing the microwave reflection loss characteristics of the electromagnetic wave absorbing material containing carbonyl iron powder of Comparative Example 3 of the present invention.
第九圖為本發明實施例4之含鐵粉之電磁波吸收物之微波反射損失特性圖。Fig. 9 is a graph showing the microwave reflection loss characteristics of the electromagnetic wave absorber containing iron powder according to Example 4 of the present invention.
第十圖為本發明比較例4之含羰基鐵粉之電磁波吸收物之微波反射損失特性圖。Fig. 10 is a graph showing the microwave reflection loss characteristics of the electromagnetic wave absorbing material containing carbonyl iron powder of Comparative Example 4 of the present invention.
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| US20040226404A1 (en) * | 2001-11-30 | 2004-11-18 | Jfe Steel Corporation, A Corporation Of Japan | Magnetite-iron based composite powder, magnetite-iron based powder mixture, method for producing the same, method for remedying polluted soil, water or gases and electromagnetic wave absorber |
| US20050002851A1 (en) * | 2002-11-26 | 2005-01-06 | Mcelrath Kenneth O. | Carbon nanotube particulates, compositions and use thereof |
| CN1767757A (en) * | 2005-09-16 | 2006-05-03 | 浙江工业大学 | Electromagnetic wave absorbing material |
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| US20040226404A1 (en) * | 2001-11-30 | 2004-11-18 | Jfe Steel Corporation, A Corporation Of Japan | Magnetite-iron based composite powder, magnetite-iron based powder mixture, method for producing the same, method for remedying polluted soil, water or gases and electromagnetic wave absorber |
| US20050002851A1 (en) * | 2002-11-26 | 2005-01-06 | Mcelrath Kenneth O. | Carbon nanotube particulates, compositions and use thereof |
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