(a) powder characteristics
Aluminum is a silver grey metal, aluminum powder and relative sub agent is pigment. Aluminum paste is a mixture of aluminum pigments and solvent, it uses and characteristics and powder of roughly the same, because quality is 26.98, the relative density is 2.55, purity 99.5% aluminummelting point of 685 degrees, the boiling point of 2065 degrees, the latent heat of fusion 323kj/g,aluminum reduction, easy oxidation, heat release during the oxidation process. When the rapid oxidation of 15.5 kj/g per gram of exothermic, aluminum is a malleable metal, easy processing.Oxide film aluminum metal surface transparent, and has good chemical stability.
Aluminum pigment in refers to particle scaly, surface coating treatment it is simple and convenient to use, so the production and use of more.
(two) compared with other pigments with aluminum powder pigment, but also has the characteristic,in the following aspects:
The characteristics of aluminum particle 1, scalelike covered scaly, the proportion of its sheet size and thickness of approximately (40:1) - (100:1), aluminum powder dispersed into the characteristics and substrate in parallel with a carrier, many of the powder particle size are connected with each other, each other to fill the metal film formed a continuous, covering the bottom material the light outside, and reflective film, this is the aluminum special covering power. Aluminum coveringdepends on the surface area of large and small, also is the diameter thickness ratio. Aluminum has been extended in the grinding process, the diameter to thickness ratio increasing, the hiding poweris increased.
Aluminum powder, aluminum powder 2 shielding characteristics of dispersed in a carrier in thefloating motion, the motion results always make themselves and be carrier coating substrate to formcontinuous layer parallel, aluminum powder, aluminum powder and the carrier within the membranelayer in the multilayer parallel arrangement. Each layer of aluminum between the pore are mutually staggered, cut off the capillary porous membrane, water, gas outside cannot penetrate the Mao Xikong reached the bottom material, physical shielding of this feature is the aluminum powder isgood.
3, aluminum reflecting light characteristics of Xuyang aluminium powder by light color, metallic lusterand high aluminium, its surface is bright and clean, can reflect visible light, ultraviolet and infrared60%-90%, coating for objects containing aluminium powder, the silvery surface,.
4, powder "double color effect" due to characteristics of aluminum powder with metallic luster and parallel to the property of being coated, the carrier containing transparent pigment, changes ofaluminum gloss and color depth and incident angle of incident light from the perspective of the occurrence of light and color, this property is called "double color effect". Aluminum powder isarranged in different layers in the film, when the incident light to each layer of aluminum flake,subject to different weakened by coating through the different thickness, the reflected light ofapparent brightness is different. When the film light with transparent pigment and powder inside, the incident light through the pigment particles become light, through the different levels of aluminumreflected changes happen, tone and metal light, the incident light and view from the vertical positionto move gradually horned, light through the different number of particles of pigment and different particle size Aluminum powder, color and metal light reflecting light also occurred in infinite change.The characteristics of aluminum powder, has been widely used in paint, hammer paint or paint formetal.
Characteristics of the 5 aluminum pigment floating, with a big kind of aluminum and aluminum pasteis the floating type, it is characterized by scale like floating on the coating surface.