A preparation method of multifunctional composite stealth coating

Abstract

The present invention discloses a method for preparing a multifunctional composite stealth coating. The present invention uses silicone rubber resin material and the soft and flexible characteristics of silicone rubber resin to prepare a near-infrared absorption composite material and a thermochromic composite material with silicone rubber resin as a matrix material, and the two coatings are bonded and composited by a secondary curing method. The near-infrared absorption composite material layer can effectively absorb electromagnetic waves in the 1.06μm band, thereby reducing the reflectivity of the relevant band. The thermochromic composite material can realize the transformation of the material layer from black to gray in a heated state, thereby achieving a visual camouflage effect.

Description

Technical Field

[0001] The invention belongs to the field of stealth coating preparation, and specifically relates to a method for preparing a multifunctional composite stealth coating. Background Art

[0002] In recent years, with the development of laser guidance and detection technology, the accuracy of laser-guided weapons has been greatly improved. Once the target is discovered, it is difficult to guarantee survival. Therefore, how to reduce the laser signal characteristics of the target, so that the target is not easily discovered and captured by local laser-guided weapons in war, and improve the survivability of the target has received widespread attention from scholars at home and abroad. The traditional 1.06μm near-infrared absorption coating that weakens the detection sensitivity and guidance accuracy of local equipment is an effective technical method. By using polyurethane or silicone rubber materials as the base material, a coating that can reduce the reflectivity of the 1.06μm band is prepared, thereby greatly reducing the infrared characteristics of the target. However, a single-function near-infrared absorption coating cannot meet the multi-faceted stealth requirements of the target. In the actual battlefield environment, in addition to considering the laser signal characteristics of the target, it is also necessary to consider the characteristics of the target in the visible light range, that is, the visual stealth effect of the target.

[0003] Therefore, the fusion of the target visual color and the ambient color can reduce the visible light visual characteristics, thereby achieving all-round camouflage for the target. Summary of the invention

[0004] In order to solve the technical problems existing in the background technology, the present invention aims to provide a method for preparing a multifunctional composite stealth coating, which is used to achieve the functions of both infrared stealth and visual stealth, and provide all-round stealth camouflage protection for the target.

[0005] In order to solve the technical problem, the technical solution of the present invention is:

[0006] A method for preparing a multifunctional composite stealth coating, the method comprising:

[0007] Step 1: First, prepare a PDMS silicone rubber prepolymer, wherein the basic component and the curing agent are stirred and mixed in a mass ratio of 1:1;

[0008] Step 2: Divide the mixed PDMS silicone rubber prepolymer into two parts, add nano-samarium oxide particles into one part, pour it into a mold after degassing and stirring to fully mix, and after controlling the thickness, cure it to prepare a near-infrared absorption composite material layer;

[0009] Step 3: Add another portion of the mixed PDMS silicone rubber prepolymer to the black and white thermochromic powder and the carbon black powder, degas and stir to mix them thoroughly, then pour them into the upper layer of the near-infrared absorption composite material cured in step S2, and cure them to obtain a thermochromic composite material layer:

[0010] Step 4: After the curing is completed, the prepared composite material is demolded. At this time, the near-infrared absorbing material and the thermochromic material are firmly bonded together after the second curing.

[0011] Furthermore, Dow Corning Sylgard 184 PDMS silicone rubber prepolymer was used.

[0012] Further, in step S2, one of the mixed PDMS silicone rubber prepolymers is added with nano samarium oxide particles with a particle size of 100-500 nm in a mass ratio of 3:2, and after degassing and stirring to fully mix, it is poured into a mold with a thickness controlled at about 2 mm. It is placed in an environment of 80°C for 2 hours for curing to obtain a near-infrared absorbing composite material.

[0013] Furthermore, in step S3, another portion of the mixed PDMS silicone rubber prepolymer is added to black and white thermochromic powder and carbon black powder with a color change temperature of 30°C in a mass ratio of 200:2:1, and after degassing and stirring to fully mix, it is poured onto the near-infrared absorption composite material cured in the second step. The thickness is controlled to be less than 1 mm, and it is placed in an environment of 80°C for 2 hours for curing to obtain a thermochromic composite material.

[0014] Furthermore, in step S4, the composite material may be cut after demoulding to prepare for other different uses.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] The present invention uses silicone rubber resin material and the soft and flexible characteristics of silicone rubber resin to prepare a near-infrared absorption composite material and a thermochromic composite material with silicone rubber resin as a matrix material, and the two coatings are bonded and composited by a secondary curing method. The near-infrared absorption composite material layer can effectively absorb electromagnetic waves in the 1.06μm band, thereby reducing the reflectivity of the relevant band. The thermochromic composite material can achieve the transformation of the material layer from black to gray in a heated state, thereby achieving a visual camouflage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 , schematic diagram of the structure of the multifunctional composite stealth coating;

[0018] Figure 2 , schematic diagram of the thermochromic effect of the prepared composite stealth coating;

[0019] Figure 3 , sample reflectivity test results. DETAILED DESCRIPTION

[0020] The specific implementation mode of the present invention is described below in conjunction with embodiments:

[0021] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0022] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0023] Embodiment 1:

[0024] like Figure 1 (a) Figure 1 (b) shows: (a) schematic diagram of the structure of the multifunctional composite stealth coating before heating, (b) schematic diagram of the structure of the multifunctional composite stealth coating before heating.

[0025] The present invention uses silicone rubber resin material and the soft and flexible characteristics of silicone rubber resin to prepare near-infrared absorption composite materials and thermochromic composite materials with silicone rubber resin as the matrix material, and bond the two coatings together by a secondary curing method. The near-infrared absorption composite material layer can effectively absorb electromagnetic waves in the 1.06μm band, thereby reducing the reflectivity of the relevant band. The thermochromic composite material can achieve the transformation of the material layer from black to gray under heating, thereby achieving the effect of visual camouflage. The specific preparation method is:

[0026] Prepare Dow Corning Sylgard 184PDMS silicone rubber prepolymer, wherein the base component and the curing agent are stirred and mixed at a mass ratio of 1:1;

[0027] Preparation of near-infrared absorption composite materials: Divide the mixed PDMS silicone rubber prepolymer into two parts, add nano samarium oxide particles with a particle size of 100-500 nm in one part according to a mass ratio of 3:2, pour into a mold after degassing and stirring to fully mix, control the thickness to about 2 mm, and put it in an environment of 80°C for 2 hours for curing;

[0028] Preparation of thermochromic composite materials: Add another portion of mixed PDMS silicone rubber prepolymer to black and white thermochromic powder and carbon black powder with a color change temperature of 30°C in a mass ratio of 200:2:1. After degassing and stirring to fully mix, pour it on the near-infrared absorption composite material cured in the second step. The thickness is controlled to be less than 1 mm, and it is placed in an 80°C environment for 2 hours for curing.

[0029] After curing, the prepared composite material is demoulded. At this time, the near-infrared absorbing material and the thermochromic material are firmly bonded together after the second curing. After demoulding, the composite material can be cut and other operations can be performed for other different uses.

[0030] Figure 2 Schematic diagram of the thermochromic effect of the prepared composite stealth coating; Figure 3 This is the sample reflectivity test result.

[0031] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

[0032] Many other changes and modifications may be made without departing from the concept and scope of the present invention.It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A method for preparing a multifunctional composite stealth coating, characterized in that: The method comprises: Step 1: First, prepare a PDMS silicone rubber prepolymer, wherein the basic component and the curing agent are stirred and mixed in a mass ratio of 1:1; Step 2: Divide the mixed PDMS silicone rubber prepolymer into two parts, add nano-samarium oxide particles into one part, pour it into a mold after degassing and stirring to fully mix, and after controlling the thickness, cure it to prepare a near-infrared absorption composite material layer; Step 3: Add another portion of the mixed PDMS silicone rubber prepolymer to the black and white thermochromic powder and the carbon black powder, degas and stir to fully mix, then pour into the upper layer of the near-infrared absorption composite material cured in step 2, and cure to obtain a thermochromic composite material layer: Step 4: After the curing is completed, the prepared composite material is demoulded. At this time, the near-infrared absorbing material and the thermochromic material are bonded after the second curing.

2. The method for preparing a multifunctional composite stealth coating according to claim 1, characterized in that: Dow Corning Sylgard 184 PDMS silicone rubber prepolymer was used.

3. The method for preparing a multifunctional composite stealth coating according to claim 1, characterized in that: In step 2, one of the mixed PDMS silicone rubber prepolymers is added with nano samarium oxide particles with a particle size of 100-500 nm in a mass ratio of 3:2, and after degassing and stirring to fully mix, it is poured into a mold with a thickness of about 2 mm. It is placed in an environment of 80°C for 2 hours for curing to obtain a near-infrared absorbing composite material.

4. The method for preparing a multifunctional composite stealth coating according to claim 1, characterized in that: In step 3, another portion of the mixed PDMS silicone rubber prepolymer is added to black and white thermochromic powder and carbon black powder with a color change temperature of 30°C in a mass ratio of 200:2:

1. After degassing and stirring to fully mix, it is poured onto the near-infrared absorption composite material cured in step 2. The thickness is controlled to be less than 1 mm. It is placed in an environment of 80°C for 2 hours for curing to obtain a thermochromic composite material.

5. The method for preparing a multifunctional composite stealth coating according to claim 1, characterized in that: In step 4, the composite material is cut after demoulding to prepare for other different uses.

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