低压和高压汞灯的玻璃外壳里面都要涂磷光体,在高压灯中是为了颜色校正,在低压灯中则磷光体是主要的发光材料。涂复磷光体有多种可用的工艺,在工业中普遍采用暂时加塑性胶粘剂的方法。这种方法就是把磷光体分散地悬浮在一种有机溶剂或水溶性的载体中, 以流动涂敷法涂到玻璃的内壁上。为了使磷光体涂层具有良好的附着效果、良好的涂层厚度、均匀性和织构,悬浮 液的配制是关键。塑性胶粘剂在退火(烘烤)过程中除去,一般是在空气中以1200°F退火。 对塑性胶粘剂的要求如下:为了控制涂层厚度和便于退火,要求分子重量要高,用少量固体能产生高的溶液粘度。胶粘剂和大多数磷光体不能起化学反应作用,不能引起絮凝现象,否则对颗粒分散特性会起阻碍作用。实际上通过表面吸收使分散情况有一定 Phosphors are applied inside the glass envelope of low-pressure and high-pressure mercury lamps, color-corrected in high-pressure lamps and phosphor in low-pressure lamps as the main luminescent material. There are a variety of coated phosphors available process, commonly used in the industry temporarily plastic adhesive method. In this method, the phosphor is dispersedly suspended in an organic solvent or a water-soluble carrier and applied by flow coating to the inner wall of the glass. In order for the phosphor coating to have good adhesion, good coating thickness, uniformity and texture, suspension formulation is the key. The plasticized adhesive is removed during annealing (baking) and is generally annealed at 1200F in air. The requirements for plastic adhesives are as follows: In order to control the thickness of the coating and to facilitate annealing, higher molecular weight is required, with a small amount of solids producing high solution viscosity. Adhesives and most of the phosphors can not play a chemical reaction, can not cause flocculation phenomenon, otherwise the particle dispersion will impede the role of dispersion. In fact through the surface to absorb the dispersion of a certain extent