CN112662183B - Weather-resistant wave absorber composition and preparation method thereof - Google Patents

Abstract

A weather-resistant wave absorber composition and a preparation method thereof relate to the field of materials. The weather-resistant wave absorber composition is characterized by comprising the following raw materials in percentage by mass: 50-90 parts of methyl vinyl silicone resin, 10-50 parts of phenyl vinyl silicone resin, 1-10 parts of reinforcing filler, 1-10 parts of cross-linking agent, 0.002-0.02 part of platinum catalyst, 0.0002-0.004 part of inhibitor and 50-150 parts of magnetic wave absorbing agent. The patent selects the material of the composition, the selected material has good weather resistance, and the composition can be prepared by a one-step method. The preparation method of the weather-resistant wave absorber composition is used for preparing the weather-resistant wave absorber composition.

Description

Weather-resistant wave absorber composition and preparation method thereof

technical field

The invention relates to the field of materials, in particular to electromagnetic wave absorbing materials.

Background technique

With the rapid development of information technology, all kinds of digital and high-frequency electrical equipment are constantly developing in the direction of miniaturization, digitization and integration. The communication complexity between devices is getting higher and higher, and they are easily affected by internal or external electromagnetic interference. A functional error or failure has occurred. At present, traditional electromagnetic wave absorbing materials can not meet the needs of the market. This is because a single electromagnetic wave absorbing material has a complex frequency band and cannot solve the reflection problem. Therefore, a multi-component composite such as wave-transmitting material and absorbing material is generally used to form an electromagnetic wave absorber, which makes more The electromagnetic wave enters the material inside, instead of being reflected back from the surface, so the absorption efficiency of electromagnetic wave. Generally speaking, the wave-transmitting material and the absorbing material of the absorber are prepared separately and compounded by lamination, etc., and there are disadvantages such as complicated preparation process and difficulty in preparing complex absorbers.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a weather-resistant wave absorber composition to solve the above-mentioned technical problems.

Another object of the present invention is to provide a preparation method of the weather-resistant wave absorbing body composition for preparing the weather-resistant wave absorbing body composition.

The technical problem solved by the present invention can be realized by the following technical solutions:

A weather-resistant wave absorber composition, characterized in that it comprises the following raw materials by mass percentage: 50-90 parts of methyl vinyl silicone resin, 10-50 parts of phenyl vinyl silicone resin, 1-10 parts of reinforcing filler, 1- 10 parts of crosslinking agent, 0.002-0.02 part of platinum catalyst, 0.0002-0.004 part of inhibitor, 50-150 parts of magnetic wave absorber. In this patent, the material of the composition is selected, the selected material has good weather resistance, and can be prepared by a one-step method.

Preferably, the methyl vinyl silicone resin has a viscosity of 5000-10000 mPa·s and a vinyl mass fraction of 0.8-1.6%. The viscosity of the phenyl vinyl silicone resin is 3000-10000 mPa·s, the mass fraction of phenyl is 10-50%, and the mass fraction of vinyl is 0.2-0.8%. This patent has excellent weather resistance for selecting methyl vinyl silicone resin and phenyl vinyl silicone resin as the base material.

Preferably, the reinforcing agent is fumed silica or precipitated silica. This patent selects the reinforcing agent, which can improve the mechanical strength of the wave absorber.

The cross-linking agent is hydrogen-containing silicone oil, including 0.6-1.5% hydrogen-containing silicone oil of side groups and 0.05-0.1% hydrogen-containing silicone oil of end groups. The platinum catalyst includes a Custer platinum catalyst, and the platinum content is 3000-5000 ppm. The inhibitors include 1-acetylene-1-cyclohexanol, 3-methyl-1-butyn-3-ol, 3,5-dimethyl-1-hexyn-3-ol, 3-phenyl -1-butyn-3-ol in a combination of one or two or a combination of two or more. The magnetic wave absorbing agent includes ferrite powder, carbonyl iron powder and other magnetic wave absorbing agents, the particle size of the magnetic wave absorbing agent is 0.05-100 microns, and the shape includes needle-like, rod-like, flake-like, spherical, etc., preferably rod-like or Sheet absorber.

The preparation method of the weather-resistant wave absorber composition is characterized in that, the raw materials for the preparation of the weather-resistant wave absorber composition are put into a mixing device and mixed to prepare a mixture, the mixture is put into a mold, and a magnetic field is applied to the mold to make the magnetic filler Move downward, it is divided into upper and lower layers, and then solidify for 1-2 hours at 100℃-200℃. The patent attracts the magnetic wave absorbing agent to move along the direction of the magnetic field through the action of the magnetic field, and can realize the one-step preparation of the composition, the preparation process is simple, and the prepared composition has reliable and stable performance.

Preferably, it is mixed by a planetary mixer, a planetary mixer or the like.

Preferably, the upper layer is composed of a wave-transmitting material of silicone resin, and the lower layer is composed of a wave-absorbing material composed of silicone resin and a wave absorbing agent.

Detailed ways

In order to make the technical means, creative features, achieved objects and effects of the present invention easy to understand and understand, the present invention is further described below.

A weather-resistant wave absorber composition, comprising the following raw materials by mass percentage: 50-90 parts of methyl vinyl silicone resin, 10-50 parts of phenyl vinyl silicone resin, 1-10 parts of reinforcing filler, 1-10 parts of cross-linking agent, 0.002-0.02 part of platinum catalyst, 0.0002-0.004 part of inhibitor, 50-150 part of magnetic wave absorbing agent. In this patent, the material of the composition is selected, the selected material has good weather resistance, and can be prepared by a one-step method.

Preferably, the methyl vinyl silicone resin has a viscosity of 5000-10000 mPa·s and a vinyl mass fraction of 0.8-1.6%. The viscosity of the phenyl vinyl silicone resin is 3000-10000 mPa·s, the mass fraction of phenyl is 10-50%, and the mass fraction of vinyl is 0.2-0.8%. The reinforcing agent is fumed silica or precipitated silica. This patent selects the reinforcing agent, which can improve the mechanical strength of the wave absorber. The cross-linking agent is hydrogen-containing silicone oil, including 0.6-1.5% hydrogen-containing silicone oil of side groups and 0.05-0.1% hydrogen-containing silicone oil of end groups. The platinum catalyst includes a Custer platinum catalyst, and the platinum content is 3000-5000 ppm. The inhibitors include 1-acetylene-1-cyclohexanol, 3-methyl-1-butyn-3-ol, 3,5-dimethyl-1-hexyn-3-ol, 3-phenyl -1-butyn-3-ol in a combination of one or two or a combination of two or more. The magnetic wave absorbing agent includes ferrite powder, carbonyl iron powder and other magnetic wave absorbing agents, the particle size of the magnetic wave absorbing agent is 0.05-100 microns, and the shape includes needle-like, rod-like, flake-like, spherical, etc., preferably rod-like or Flake Absorber.

The preparation method of the weather-resistant wave absorbing body composition comprises the following steps: putting the raw materials for the preparation of the weather-resistant wave absorbing body composition into a mixing device and mixing to obtain a mixture, putting the mixture into a mold, applying a magnetic field to the mold, and causing the magnetic filler to move downward, Divided into upper and lower layers, and then cured for 1-2 hours at 100℃-200℃.

Specific Example 1

Raw material ratio: 70 parts of methyl vinyl silicone resin, 30 parts of phenyl vinyl silicone resin, 6 parts of hydrophobic fumed silica, 4 parts of side-group hydrogen-containing silicone oil, 2 parts of end-group hydrogen-containing silicone oil, 0.005 parts of platinum Catalyst, 0.001 part of 1-acetylene-1-cyclohexanol, 80 parts of ferrite powder. The mass fraction of vinyl in methyl vinyl silicone resin is 1%. The mass fraction of vinyl in the phenyl vinyl silicone resin is 0.5%, and the mass fraction of phenyl is 30%. The specific surface area of hydrophobic fumed silica is 200g/m2. The hydrogen mass fraction of the side group hydrogen-containing silicone oil is 0.8%, and the hydrogen mass fraction of the end group hydrogen-containing silicone oil is 0.05%. Platinum catalyst platinum mass fraction 3000ppm. The ferrite powder has a particle size of 10um and a flake shape.

Preparation method: The composition attracts the magnetic filler to move downward in a 30cm*30cm*4mm (length*width*height) mold through the action of a magnetic field, and is divided into upper and lower layers, and the upper layer is composed of a wave-transmitting material without a wave-absorbing agent , the thickness is about 2mm; the lower layer is composed of silicone resin and wave absorbing agent, the thickness is about 2mm, and then cured in an oven at 100-200 ° C for 1-2 hours to obtain a wave absorbing body.

Specific embodiment 2

Raw material ratio: 70 parts of methyl vinyl silicone resin, 30 parts of phenyl vinyl silicone resin, 6 parts of hydrophobic fumed silica, 4 parts of side-group hydrogen-containing silicone oil, 2 parts of end-group hydrogen-containing silicone oil, 0.005 parts of platinum Catalyst, 0.001 parts of 1-acetylene-1-cyclohexanol, 80 parts of carbonyl iron powder. The mass fraction of vinyl in methyl vinyl silicone resin is 1%. The mass fraction of vinyl in the phenyl vinyl silicone resin is 0.5%, and the mass fraction of phenyl is 30%. The specific surface area of hydrophobic fumed silica is 200g/m2. The hydrogen mass fraction of the side group hydrogen-containing silicone oil is 0.8%, and the hydrogen mass fraction of the end group hydrogen-containing silicone oil is 0.05%. Platinum catalyst platinum mass fraction 3000ppm. The carbonyl iron powder has a particle size of 1um and a flake shape.

Preparation method: The composition attracts the magnetic filler to move downward in a 30cm*30cm*4mm (length*width*height) mold through the action of a magnetic field, and is divided into upper and lower layers, and the upper layer is composed of a wave-transmitting material without a wave-absorbing agent , the thickness is about 1mm; the lower layer is composed of silicone resin and wave absorbing agent, the thickness is about 3mm, and then cured in an oven at 100-200 ° C for 1-2 hours to obtain a wave absorbing body.

Comparative Example 1

The formula is the same as that of the specific example 1, except that the fumed silica is not added in the comparative example 1.

Comparative Example 2

The same formula as the specific embodiment 2, the difference is that by increasing the magnetic field, a wave-absorbing body with a thickness of about 3 mm of the wave-transmitting material and 1 mm of the wave-absorbing material is obtained.

The specific embodiment 1, the specific embodiment 2 and the comparative example 1 and the comparative example 2 are tested respectively, the tensile strength is tested based on GB/T 528, and the reflectivity of the wave absorber is tested based on GJB 2038-1994, The test results are shown in Table 1.

According to the test results, it can be seen that:

1. The performance of the composition prepared in specific example 2 is very excellent.

2. The addition of fumed silica has a very good effect.

It should be noted that, in this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The foregoing has shown and described the basic principles and main features of the present invention, as well as the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Various changes and modifications fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. The weather-resistant wave absorber composition is characterized by comprising the following raw materials: 50-90 parts of methyl vinyl silicone resin, 10-50 parts of phenyl vinyl silicone resin, 1-10 parts of reinforcing filler, 1-10 parts of cross-linking agent, 0.002-0.02 part of platinum catalyst, 0.0002-0.004 part of inhibitor and 50-150 parts of magnetic wave absorbing agent;

putting the raw materials into mixing equipment for mixing to obtain a mixture, putting the mixture into a mould, applying a magnetic field to the mould to enable the magnetic wave absorbing agent to move downwards to be divided into an upper layer and a lower layer, and then curing at 100-200 ℃ for 1-2h for forming;

the upper layer is made of wave-transmitting material without wave-absorbing agent and is 1mm thick; the lower layer is made of wave-absorbing material consisting of silicone resin and wave-absorbing agent, and the thickness of the wave-absorbing material is 3 mm.

2. The weather-resistant wave absorber composition as claimed in claim 1, wherein the methyl vinyl silicone resin has a viscosity of 5000-10000 mPa-s and a vinyl mass fraction of 0.8-1.6%.

3. The weather-resistant wave absorber composition as claimed in claim 1, wherein the viscosity of the phenyl vinyl silicone resin is 3000-10000 mPa-s, the mass fraction of the phenyl is 10-50%, and the mass fraction of the vinyl is 0.2-0.8%.

4. The weather-resistant absorber composition of claim 1, wherein the reinforcing filler is fumed silica or precipitated silica.

5. The composition of claim 1, wherein the crosslinking agent is a hydrogen-containing silicone oil comprising 0.6-1.5% by weight of hydrogen of a pendant hydrogen-containing silicone oil and 0.05-0.1% by weight of a terminal hydrogen-containing silicone oil.

6. The weather-resistant wave absorber composition as claimed in claim 1, wherein the platinum catalyst comprises a Kansted platinum catalyst, and the platinum content is 3000-5000 ppm.

7. The weather-resistant wave absorber composition according to claim 1, wherein the inhibitor comprises one or a combination of two or a combination of more than two of 1-ethyne-1-cyclohexanol, 3-methyl-1-butyn-3-ol, 3, 5-dimethyl-1-hexyn-3-ol, and 3-phenyl-1-butyn-3-ol.

8. The weather-resistant wave absorber composition of claim 1, wherein the magnetic wave absorber has a particle size of 0.05-100 microns.