The invention relates to a stealth coating material and a preparation method thereof

The invention relates to the technical field of coatings, in particular to a stealth coating and a preparation method thereof. The propagation of infrared radiation in the atmosphere follows the laws of refraction, reflection, absorption and scattering of visible light, and has the general physical characteristics of light. Its transport capacity in the atmosphere is related to the amount of water and carbon dioxide in the atmosphere.

When an object emits infrared radiation, water and carbon dioxide in the atmosphere should absorb the radiation of a certain band, thus attenuating the infrared radiation signal of that band. Especially moving targets, such as aircraft, tanks, etc., have very high power sources, and will produce strong thermal infrared radiation when moving. Some high-speed moving targets, such as aircraft, generate heat during flight due to the friction between their shells and the atmosphere, which is also a thermal infrared radiation source.

In the field of stealth, low emissivity materials, especially low emissivity coatings, have been the focus of early research. This kind of coating mainly uses aluminum powder, copper powder and other low emissivity materials as infrared absorbents, there are the following shortcomings: the paint anti-pollution ability is poor, dust and moisture will significantly increase its emissivity. Therefore, the application of low-radiation coatings is greatly limited. The low emissivity infrared stealth material is difficult to be compatible with the visible light, especially the radar band camouflage, and the anti-pollution ability of the coating is poor. Dust and moisture can significantly increase its emissivity and reduce its stealth effect.

In view of the shortcomings of the existing technology, the technical problem to be solved by the invention is to provide a stealth coating material with excellent stealth effect, high wave absorption ability of the coating, small area density, light weight and high bonding strength and a preparation method thereof. In order to solve the above technical problems of stealth coating, the technical scheme adopted by stealth coating is as follows: a stealth coating, including a component and B component, the weight ratio of A component and B component is 10-15:1; One component is made from the following weight percentages of raw materials: 40-60% hydroxyacrylic resin, 10-15% carbon nanotubes, 5-10% ceramic powder, 5-8% vacuum glass beads, 1-5% siloxane coupling agent, 1-10% nano-barium sulfate, 1-10% nano-titanium dioxide, 5-10% mixture of xylene and butyl acetate. Component b is made from the following weight percentage of raw material to make biuret 100%. In the stealth coating, the weight percentage of the mixture of xylene and butyl acetate is 50%, 50%. The preparation method of the stealth coating material includes the following steps:

(1) Fully wet the vacuum glass beads and carbon nanotubes with siloxane coupling agent, and let them stand for 12-24 hours.

(2) The mixture of hydroxyacrylic resin, nano-titanium dioxide, nano-barium sulfate, ceramic powder, xylene and butyl acetate was dispersed to less than 10 microns by ultrasonic wave;

(3) The wetted vacuum glass beads and carbon nanotubes in step (I) are added to the ultrasonic dispersed intermediate below 10 microns in step (2), dispersed with a stepless frequency conversion disperser for 0.5 to 1 hour under the condition of 300 ~ 600 RPM, and packaged for storage; (4) Put biuret component B into a small bucket and put it into storage;

(5) Mix the obtained component A and component B evenly according to the weight ratio of 10-15:1 to obtain the stealth coating of the product.

The advantages of the stealth coating material and its preparation method are as follows: the stealth coating material and its preparation method have strong stealth effect, the prepared coating has strong adhesion with the substrate, good impact resistance and wear resistance, high wave absorption capacity, small area density, light weight, and high bonding strength.