Absorbent of tungsten trioxide coated magnetic metal as well as preparation method and application of absorbent

Abstract

The invention discloses a tungsten trioxide coated magnetic metal absorbent and a preparation method and application thereof, and relates to the technical field of multi-spectrum compatible stealth materials. The method comprises the following steps: uniformly dispersing tungsten salt and a magnetic metal absorbent in a water solvent to obtain dispersion liquid; heating the dispersion liquid in a water bath to 60-90 DEG C, adjusting the pH value of the dispersion liquid to 1-3, and reacting to obtain a pre-product; and treating the pre-product at 400-600 DEG C for 1-2 hours to obtain the tungsten trioxide coated magnetic metal absorbent. According to the absorbent prepared by the invention, tungsten trioxide coating the outer layer can be changed from colorless to blue under the condition of electrification, so that the effect of compatibility of sky blue visible light stealth and radar stealth is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-spectrum compatible stealth materials, and in particular to a tungsten trioxide-coated magnetic metal absorbent, a preparation method thereof and an application thereof. Background Art

[0002] With the continuous development of technology, a single stealth technology can no longer meet the needs of modern stealth. The ability of visible light imaging guidance systems to detect, track, and intercept targets is becoming stronger and stronger. The threats faced by target stealth are becoming more and more serious. Therefore, a new material for visible light stealth that is compatible with radar absorption is needed.

[0003] The prior art discloses a stealth material system and a preparation method thereof. A radar visible light broadband stealth material is prepared by matching the structural wave absorbing layer with the camouflage net. However, the camouflage net is easily physically damaged during the flight of the aircraft, which can sharply reduce the optical stealth performance. The prior art also discloses a high-temperature radar-resistant and infrared-compatible stealth coating and a preparation method thereof, wherein the high-temperature radar-resistant and infrared-compatible stealth coating is a layered structure, which includes a metal bonding layer, a ceramic wave absorbing layer, a patch resistor type high-temperature periodic structure layer, a ceramic isolation layer, and an infrared low-emissivity frequency selective surface layer from the inside to the outside. The surface layer uses precious metal Pt as a filler or a Pt metal layer as an infrared low-emissivity layer, which is relatively expensive. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned background technology, the present invention aims at the problem that the optical broadband stealth material in the prior art may be physically damaged, causing the optical stealth performance to drop sharply. The present invention provides a tungsten trioxide-coated magnetic metal absorber compatible with visible light stealth and radar stealth, and its preparation method and application. The method disperses the magnetic metal absorber powder in a solution containing tungsten salt, adjusts the pH of the dispersion, so that tungsten ions are precipitated on the surface of the magnetic metal absorber, and then heat-treats it into tungsten trioxide to obtain a tungsten trioxide-coated magnetic metal absorber. Tungsten trioxide is an electrochromic material. When electricity is applied, electrons enter the tungsten trioxide lattice, which changes the redox state of tungsten trioxide, causing the energy band structure to change, thereby causing the absorption and reflection characteristics of light to change, and the color changes from colorless to blue. The tungsten trioxide-coated magnetic metal absorber, when electricity is applied, the tungsten trioxide coated on the outer layer will change from colorless to blue, thereby achieving the effect of sky blue visible light stealth and radar stealth compatibility.

[0005] The first object of the present invention is to provide a method for preparing a tungsten trioxide-coated magnetic metal absorbent, comprising the following steps: The tungsten salt and the magnetic metal absorbent are uniformly dispersed in a water solvent to obtain a dispersion; The dispersion liquid is heated in a water bath to 60-90° C., and the pH of the dispersion liquid is adjusted to 1-3, and a reaction is performed to obtain a pre-product; The pre-product is treated at 400-600℃ for 1-2h to obtain tungsten trioxide coated magnetic metal absorbent.

[0006] Preferably, the mass ratio of the tungsten salt to the magnetic metal absorbent is (1-5):(2-50).

[0007] Preferably, the magnetic metal absorbent includes one or more of sendustine-aluminum powder, sendustine-chromium powder, iron-nickel powder, iron-nickel-molybdenum powder and carbonyl iron powder.

[0008] Preferably, the tungsten salt includes one or more of sodium tungstate, potassium tungstate and ammonium tungstate.

[0009] Preferably, the pH of the dispersion is adjusted using 1% to 10% by mass of dilute hydrochloric acid or 1% to 10% by mass of dilute sulfuric acid.

[0010] The second object of the present invention is to provide an absorbent of tungsten trioxide coated magnetic metal.

[0011] The third object of the present invention is to provide an absorbent of tungsten trioxide coated magnetic metal for use in electromagnetic absorption.

[0012] The fourth object of the present invention is to provide a microwave absorbing coating, comprising an absorbent of tungsten trioxide coated magnetic metal; the microwave absorbing coating uses resin as a matrix.

[0013] Preferably, the resin is one or more of epoxy resin, polyurethane resin, silicone resin, acrylic resin, and alkyd resin.

[0014] A fifth object of the present invention is to provide a method for preparing an absorbing coating, comprising the following steps: Mix the resin and the diluent, and after the resin solution is evenly dispersed, add the tungsten trioxide-coated magnetic metal absorber and grind it in a grinder to obtain the radar absorbing coating; Spraying the microwave absorbing coating onto the surface of the substrate and curing it in an oven to obtain the microwave absorbing coating; Wherein, the mass ratio of resin, diluent and tungsten trioxide coated magnetic metal absorbent is (10-70):(10-100):(30-90); The diluent is xylene, acetone or tetrahydrofuran; The curing temperature is 80~300℃ and the curing time is 1~24h.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a tungsten trioxide-coated magnetic metal absorber and a preparation method and application thereof. The method comprises the following steps: dispersing magnetic metal absorber powder in a solution containing tungsten salt, adjusting the pH of the dispersion so that tungsten ions are precipitated on the surface of the magnetic metal absorber, and then heat-treating the tungsten trioxide to obtain a tungsten trioxide-coated magnetic metal absorber. When power is supplied, the tungsten trioxide coated on the outer layer changes from colorless to blue, thereby achieving the effect of sky blue visible light stealth and radar stealth compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The SEM images of the iron-silicon-chromium powder (a) and the tungsten trioxide-coated iron-silicon-chromium powder (b) of Example 1 are shown.

[0017] Figure 2 These are SEM images of Sendust powder (a) and tungsten trioxide-coated Sendust powder (b) of Example 2.

[0018] Figure 3 The SEM images of the iron-nickel powder (a) and the tungsten trioxide-coated iron-nickel powder (b) of Example 3 are shown.

[0019] Figure 4 The graphs are the real part of the dielectric constant (a), the imaginary part of the dielectric constant (b), the real part of the magnetic permeability (c), and the imaginary part of the magnetic permeability (d) of the iron-silicon-chromium powder and the tungsten trioxide-coated iron-silicon-chromium powder in Example 1.

[0020] Figure 5 The graphs are the real part of the dielectric constant (a), the imaginary part of the dielectric constant (b), the real part of the magnetic permeability (c), and the imaginary part of the magnetic permeability (d) of the sendustine powder and the sendustine trioxide-coated sendustine powder of Example 2.

[0021] Figure 6 The graphs are the real part of the dielectric constant (a), the imaginary part of the dielectric constant (b), the real part of the magnetic permeability (c), and the imaginary part of the magnetic permeability (d) of the iron-nickel powder and the tungsten trioxide-coated iron-nickel powder in Example 3.

[0022] Figure 7 The coating (a) is prepared by using tungsten trioxide coated iron, silicon, and chromium powder as an absorbent in Example 1, and the coating (b) is prepared by using tungsten trioxide coated iron, silicon, and chromium powder as an absorbent when power is turned on.

[0023] Figure 8 The coating (a) is prepared by using tungsten trioxide coated sendust powder as absorbent in Example 2 and the coating (b) is prepared by using tungsten trioxide coated sendust powder as absorbent when power is turned on.

[0024] Fig. 9The coating (a) is prepared by using tungsten trioxide coated iron-nickel powder as an absorbent in Example 3 and the coating (b) is prepared by using tungsten trioxide coated iron-nickel powder as an absorbent when power is turned on. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand and implement the technical solution of the present invention, the present invention is further described below in conjunction with specific embodiments and drawings, but the embodiments are not intended to limit the present invention.

[0026] The purpose of the present invention is to provide a tungsten trioxide coated magnetic metal absorber and a preparation method and application thereof. The absorber, when powered on, can achieve the effects of sky blue visible light stealth and radar stealth compatibility.

[0027] In order to achieve the above object, the first aspect of the present invention provides a method for preparing a tungsten trioxide-coated magnetic metal absorbent, comprising the following steps: The tungsten salt and the magnetic metal absorbent are uniformly dispersed in a water solvent to obtain a dispersion; The dispersion liquid is heated in a water bath to 60-90° C., and the pH of the dispersion liquid is adjusted to 1-3, and a reaction is performed to obtain a pre-product; The pre-product is treated at 400-600℃ for 1-2h to obtain tungsten trioxide coated magnetic metal absorbent.

[0028] The present invention disperses magnetic metal absorber powder in a solution containing tungsten salt, adjusts the pH of the dispersion so that tungsten ions are precipitated on the surface of the magnetic metal absorber, and then heat-treats the tungsten ions to convert them into tungsten trioxide, thereby obtaining a tungsten trioxide-coated magnetic metal absorber. When power is turned on, the tungsten trioxide coated on the outer layer changes from colorless to blue, thereby achieving the effect of sky blue visible light stealth and radar stealth compatibility.

[0029] The mass ratio of the tungsten salt to the magnetic metal absorbent is (1-5):(2-50).

[0030] The magnetic metal absorbent includes one or more of sendustine-aluminum powder, sendustine-chromium powder, iron-nickel powder, iron-nickel-molybdenum powder and carbonyl iron powder.

[0031] The tungsten salt includes one or more of sodium tungstate, potassium tungstate and ammonium tungstate.

[0032] The pH of the dispersion is adjusted using 1% to 10% by mass dilute hydrochloric acid or 1% to 10% by mass dilute sulfuric acid.

[0033] Exemplarily, a method for preparing a tungsten trioxide-coated magnetic metal absorbent comprises: S1, mixing tungsten salt, magnetic metal absorbent and deionized water to obtain a dispersion; Specifically, tungsten salt is dissolved in deionized water, and a magnetic metal absorbent is added under ultrasonic dispersion to obtain a dispersion.

[0034] The mass ratio of tungsten salt, magnetic metal absorbent and deionized water is (1-5):(2-50):(5-50). Controlling the mass ratio of tungsten salt, magnetic metal absorbent and deionized water within the above range can ensure that tungsten trioxide successfully coats the magnetic metal absorbent.

[0035] Tungsten salts include sodium tungstate, potassium tungstate, ammonium tungstate, etc. The above tungsten salts act as tungsten sources.

[0036] The magnetic metal absorbers include iron silicon aluminum powder, iron silicon chromium powder, iron nickel powder, iron nickel molybdenum powder, carbonyl iron powder, etc. The selection of the above magnetic metal absorbers can ensure that the synthesized tungsten trioxide coated magnetic metal absorber has good wave absorbing performance.

[0037] S2. In a water bath heating environment, adjust the pH of the dispersion, react for 24 hours to obtain a pre-product, filter the pre-product, and vacuum dry it at 60° C. The water bath heating temperature is between 60 and 90°C, which can ensure that the tungsten ions are stably deposited on the surface of the magnetic metal absorbent without precipitation and agglomeration.

[0038] The substance used to adjust the pH of the dispersion liquid is dilute hydrochloric acid, dilute sulfuric acid, etc. The use of the above acid to adjust the pH can enable tungsten ions to be deposited on the surface of the magnetic metal absorbent.

[0039] Adjusting the pH of the dispersion between 1 and 3 can control the deposition rate of tungsten ions and avoid the tungsten ions being difficult to deposit or depositing too quickly, resulting in agglomeration.

[0040] S3. The dried pre-product is heat-treated for 1 hour and then ground to obtain a tungsten trioxide-coated magnetic metal absorbent.

[0041] The temperature of the heat treatment is between 400° C. and 600° C. The heat treatment can transform the tungstic acid coated on the surface of the magnetic metal absorber into tungsten trioxide.

[0042] A second aspect of the present invention provides an absorbent of tungsten trioxide coated magnetic metal.

[0043] A third aspect of the present invention provides an absorbent of tungsten trioxide coated magnetic metal for use in electromagnetic absorption.

[0044] A fourth aspect of the present invention provides an absorbing coating, comprising an absorbent of tungsten trioxide coated magnetic metal; the absorbing coating adopts a resin as a matrix.

[0045] Wherein, the resin is one or more of epoxy resin, polyurethane resin, silicone resin, acrylic resin and alkyd resin.

[0046] A fifth aspect of the present invention provides a method for preparing an absorbing coating, comprising the following steps: Q1. Mix the resin and diluent, and after the resin solution is evenly dispersed, add the tungsten trioxide-coated magnetic metal absorber and grind it in a grinder to obtain the absorbing coating; Wherein, the mass ratio of resin, diluent and tungsten trioxide coated magnetic metal absorbent is (10-70):(10-100):(30-90); The rotation speed of the grinder is 40 to 80 r / min, and the grinding time is 2 to 4 hours.

[0047] The diluent is xylene, acetone or tetrahydrofuran.

[0048] Q2, spraying the microwave absorbing coating on the surface of the substrate, and curing it in an oven to obtain the microwave absorbing coating; Specifically, the substrate is tinplate, titanium alloy, etc.; The coating thickness is 0.5mm to 2mm; The curing temperature is 80~300℃, and the curing time is 1~24h. When the resin is a silicone resin, the curing temperature is 240℃ / 1h; when the resin is an epoxy resin, the curing temperature is 80℃ / 24h; when the resin is a polyamide resin, the curing temperature is 80℃ / 24h; when the resin is an acrylic resin, the curing temperature is 80℃ / 24h; when the resin is an alkyd resin, the curing temperature is 120℃ / 24h.

[0049] It should be noted that the experimental methods used in the present invention are all conventional methods unless otherwise specified; the reagents and materials used are all commercially available unless otherwise specified.

[0050] Example 1 S1. Dissolve 3g of sodium tungstate in 15g of deionized water and stir thoroughly to fully dissolve the sodium tungstate. Then add 10g of iron silicon chromium powder to the sodium tungstate solution and stir thoroughly to obtain a dispersion. S2, placing the dispersion in a water bath, adjusting the temperature to 60°C, stirring and keeping warm for 20 minutes, then dropping dilute hydrochloric acid into the dispersion, adjusting the pH of the dispersion to 2, reacting for 24 hours to obtain a pre-product, filtering the pre-product, and vacuum drying at 60°C; S3. The dried pre-product is heat treated at 500° C. for 1 h, and then ground to obtain a tungsten trioxide-coated iron-silicon-chromium absorbent.

[0051] like Figure 1As shown, SEM images of iron-silicon-chromium powder (a) and tungsten trioxide-coated iron-silicon-chromium powder (b). Figure 1 In (a), it can be seen that the surface of the iron-silicon-chromium powder is smooth and evenly dispersed. Figure 1 (b) Tungsten trioxide successfully coated the iron, silicon and chromium powders together, with a smooth surface.

[0052] like Figure 4 As shown in the figure, in the 8-12 GHz frequency band, tungsten trioxide coated iron silicon chromium absorber (FeSiCr@WO 3 ) Compared with the uncoated iron silicon chromium absorber (FeSiCr), the dielectric constant and magnetic permeability of the tungsten trioxide coated iron silicon chromium absorber change little compared with the uncoated iron silicon chromium absorber, and the absorbing performance is not destroyed.

[0053] Q1. Mix 30g of silicone resin with 70g of xylene. After the silicone resin solution is evenly dispersed, add 70g of tungsten trioxide-coated iron-silicon-chromium absorber and grind in a grinder at a grinding speed of 60r / min for 2h to obtain an absorbing coating. Q2. Spray the microwave absorbing coating onto the surface of the tinplate and cure it in an oven at a curing temperature of 240° C. / 1 h. The coating thickness is 1.5 mm to obtain the microwave absorbing coating.

[0054] like Figure 7 As shown in the figure, a coating is prepared by using tungsten trioxide coated with iron, silicon and chromium as absorbent. Figure 7 As shown in (a), the coating is black because the iron-silicon-chromium absorber is black; when the applied voltage is 15V, Figure 7 The coating shown in (b) turns dark blue and the color is uneven. This is because the tungsten trioxide coating is thin and the bottom layer is a black iron-silicon-chromium absorber. The blue color is darker and the absorber is unevenly distributed in the coating, resulting in uneven color of the coating when power is turned on.

[0055] Example 2 S1. Dissolve 4g of potassium tungstate in 25g of deionized water and stir thoroughly to dissolve sodium tungstate. Then add 14g of iron silicon aluminum powder into the potassium tungstate solution and stir thoroughly to obtain a dispersion. S2, placing the dispersion in a water bath, adjusting the temperature to 60°C, stirring and keeping warm for 20 minutes, then dropping dilute hydrochloric acid into the dispersion, adjusting the pH of the dispersion to 2, reacting for 24 hours to obtain a pre-product, filtering the pre-product, and vacuum drying at 60°C; S3. The dried pre-product is heat treated at 500° C. for 1 h, and then ground to obtain a tungsten trioxide-coated iron silicon aluminum absorbent.

[0056] like Figure 2Shown are SEM images of Sendust powder (a) and tungsten trioxide coated Sendust powder (b). Figure 2 (a) The iron, silicon and chromium powders are evenly dispersed and have a smooth surface. Figure 2 (b) Tungsten trioxide coated iron silicon aluminum powder with a rough surface.

[0057] like Figure 5 As shown in the figure, in the 8-12 GHz frequency band, tungsten trioxide coated iron silicon aluminum absorber (FeSiAl@WO 3 ) Compared with the uncoated FeSiAl absorber (FeSiAl), the dielectric constant and magnetic permeability of the tungsten trioxide coated FeSiAl absorber change little, and the absorbing performance is not destroyed.

[0058] Q1. Mix 30g of alkyd resin with 70g of xylene. After the alkyd resin solution is evenly dispersed, add 70g of tungsten trioxide-coated iron silicon aluminum absorber and grind in a grinder at a grinding speed of 60r / min for 2h to obtain an absorbing coating. Q2. Spray the microwave absorbing coating onto the surface of the titanium alloy and cure it in an oven at a curing temperature of 120° C. / 24 h. The coating thickness is 1.5 mm to obtain the microwave absorbing coating.

[0059] like Figure 8 As shown in the figure, a coating is prepared by using tungsten trioxide coated with iron silicon aluminum as an absorbent. Figure 8 As shown in (a), the coating is black because the FeSiAl absorber is silver-black; when the applied voltage is 15V, Figure 8 The coating shown in (b) turns dark blue and the color is uneven. This is because the tungsten trioxide coating is thin, and the bottom layer is a silver-black iron silicon aluminum absorber, the blue is darker, and the absorber is unevenly distributed in the coating, resulting in uneven color of the coating when power is turned on.

[0060] Example 3 S1. Dissolve 6 g of potassium tungstate in 27 g of deionized water and stir thoroughly to dissolve sodium tungstate. Then add 13 g of iron-nickel powder to the potassium tungstate solution and stir thoroughly to obtain a dispersion. S2, placing the dispersion in a water bath, adjusting the temperature to 60°C, stirring and keeping warm for 20 minutes, then dropping dilute hydrochloric acid into the dispersion, adjusting the pH of the dispersion to 2, reacting for 24 hours to obtain a pre-product, filtering the pre-product, and vacuum drying at 60°C; S3. The dried pre-product is heat treated at 500° C. for 1 h, and then ground to obtain a tungsten trioxide-coated magnetic metal absorbent.

[0061] like Figure 3 As shown, SEM images of iron-nickel powder (a) and tungsten trioxide-coated iron-nickel powder (b). Figure 3 (a) The iron-nickel powder is evenly dispersed and has a smooth surface. Figure 3 (b) The tungsten trioxide-coated iron-nickel powders are aggregated together and have a smooth surface.

[0062] like Figure 6 As shown, in the 8-12 GHz frequency band, tungsten trioxide coated iron nickel absorber (FeNi@WO 3 ) Compared with the uncoated iron-nickel absorber (FeNi), the dielectric constant and magnetic permeability of the tungsten trioxide coated iron-nickel absorber change little, and the absorbing performance is not destroyed.

[0063] Q1. Mix 30g of silicone resin with 70g of xylene. After the silicone resin solution is evenly dispersed, add 70g of tungsten trioxide-coated iron-nickel absorbent and grind in a grinder at a grinding speed of 60r / min for 2h to obtain an absorbing coating. Q2. Spray the microwave absorbing coating onto the surface of the tinplate and cure it in an oven at a curing temperature of 240° C. / 1 h. The coating thickness is 1.5 mm to obtain the microwave absorbing coating.

[0064] like Fig. 9 As shown in the figure, a coating is prepared by using tungsten trioxide coated with iron nickel as an absorbent. Fig. 9 As shown in (a), the coating is black because the iron-nickel absorber is gray-black; when the applied voltage is 15V, Fig. 9 The coating shown in (b) turns dark blue and the color is uneven. This is because the tungsten trioxide coating is thin, and the bottom layer is a gray-black iron-nickel absorber. The blue color is darker, and the absorber is unevenly distributed in the coating, resulting in uneven color of the coating when power is turned on.

[0065] In summary, the present invention provides a tungsten trioxide coated magnetic metal absorber and its preparation method and application, which mainly disperses the magnetic metal absorber powder in a solution containing tungsten salt, adjusts the pH of the dispersion so that tungsten ions are precipitated on the surface of the magnetic metal absorber, and then heat treats it to convert it into tungsten trioxide, so as to obtain a tungsten trioxide coated magnetic metal absorber which can achieve sky blue visible light stealth and radar stealth when powered on.

[0066] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a tungsten trioxide-coated magnetic metal absorbent, characterized in that: The following steps are involved: The tungsten salt and the magnetic metal absorbent are uniformly dispersed in a water solvent to obtain a dispersion; The dispersion is heated in a water bath to 60-90° C., and the pH of the dispersion is adjusted to 1-3, and a reaction is performed to obtain a pre-product; The pre-product is treated at 400-600℃ for 1-2h to obtain tungsten trioxide coated magnetic metal absorbent.

2. The method for preparing the tungsten trioxide coated magnetic metal absorbent according to claim 1, characterized in that: The mass ratio of the tungsten salt to the magnetic metal absorbent is (1-5):(2-50).

3. The method for preparing the tungsten trioxide coated magnetic metal absorbent according to claim 2, characterized in that: The magnetic metal absorbent includes one or more of sendustine-aluminum powder, sendustine-chromium powder, iron-nickel powder, iron-nickel-molybdenum powder and carbonyl iron powder.

4. The method for preparing the tungsten trioxide coated magnetic metal absorbent according to claim 2, characterized in that: The tungsten salt includes one or more of sodium tungstate, potassium tungstate and ammonium tungstate.

5. The method for preparing the tungsten trioxide coated magnetic metal absorbent according to claim 1, characterized in that: The pH of the dispersion is adjusted using 1% to 10% by mass dilute hydrochloric acid or 1% to 10% by mass dilute sulfuric acid.

6. An absorbent of tungsten trioxide coated magnetic metal obtained by the method according to any one of claims 1 to 5.

7. Use of the tungsten trioxide-coated magnetic metal absorbent according to claim 6 in electromagnetic absorption.

8. A radar absorbing coating, characterized in that: The absorbent comprises the tungsten trioxide coated magnetic metal as claimed in claim 6; the absorbing coating uses resin as a matrix.

9. The radar absorbing coating according to claim 8, characterized in that: The resin is one or more of epoxy resin, polyurethane resin, silicone resin, acrylic resin and alkyd resin.

10. A method for preparing the radar absorbing coating according to claim 8 or 9, characterized in that: The following steps are involved: Mix the resin and the diluent, and after the resin solution is evenly dispersed, add the tungsten trioxide-coated magnetic metal absorber and grind it in a grinder to obtain the radar absorbing coating; Spraying the microwave absorbing coating onto the surface of the substrate and curing it in an oven to obtain the microwave absorbing coating; Wherein, the mass ratio of resin, diluent and tungsten trioxide coated magnetic metal absorbent is (10-70):(10-100):(30-90); The diluent is xylene, acetone or tetrahydrofuran; The curing temperature is 80~300℃ and the curing time is 1~24h.

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