HC coating Network News: Abstract: The metal filler, coating curing process and coating color pigments and other factors on the rate of infrared emission experiments carried out, the results show that: with the Al content is increased, decreased firing rate; PF - Al Powder Department of optimal curing temperature is 60 , curing time is 12h; chosen CdS as the coloring pigment, not more than 2% (mass fraction) can meet the visible infrared compatible.
Keywords: metal filler; CdS; curing process; aluminum; Phenolic resin
0 Introduction Infrared Stealth Coating binder and filler mainly two parts. Binder is the basic component should have a low radiation rate; filler composition, purity, particle size, shape, heat treatment effects, the dispersion in the paint and coating content and other factors can affect the radiation effects; other pigments , curing conditions and other factors also affect the coating emissivity. This paper focuses on metal filler, pigment and coating curing process on the infrared emission rate.
1 experiment 1.1 Experimental materials and equipment
(2) Equipment: M-1730-type Fourier transform infrared spectroscopy, HWF-1 infrared emissivity measurement instrument, FA2004-type Electronic Balance, DH72-1-type constant temperature oven, QZM-1 Conical grinding ,85-2 temperature magnetic stirrer, glass slides (25mm 75mm).
1.2 Experimental Methods With magnetic stirrer, cone mill Grind By GB/T1727? 1979 (film preparation method in general) brush.
2 Results and discussion 2.1 Metal Filler on the Properties of Coatings
Metal filler is up to date coverage of IR stealth coating filler. Optical studies show that electromagnetic waves incident at the interface of different media, occurred reflection, transmission and absorption were:
+ + = 1 Type in the: ? Absorption rate; ? Reflectivity; ? Transmission rate.
According to Kirchhoff's laws are:
= The opaque surface = 0, then = 1- , the high reflectivity of visible opaque surface with low infrared emissivity. That is, the higher the reflectivity of opaque surface, the lower the absorption rate, the lower emission rate. Therefore, higher reflectivity of metal filler in the low emissivity coating of infrared stealth in favor, the high reflective properties of metal in a higher key of the original carrier density. Filler metal or alloy for a: Al, Zn, Sn, Au, bronze, reduced iron powder and so on. WANG Zi-rong, et al [1] on several metal filling the infrared emissivity study, Al powders in which the lowest rate of up to 0.47, reduced iron powder and copper powder in the firing rate remained at around 0.65. Weigh 5g
phenolic resin, followed by adding different content to them in different size aluminum powder (100 mesh, 140 mesh and 200 mesh) to 1g of ethanol as Thinner By fully grinding, brushing on the glass slide, 60 curing 12h, obtained film samples. Measuring the prepared film samples at room temperature when 8 ~ 14 m wavelength of the average infrared emissivity. Infrared emissivity film samples with the relationship between content and size shown in Figure 1.
