Method for surface coating of long afterglow luminescent powder

Step 1: Mix 2g strontium aluminate long afterglow luminescent powder with 20g anhydrous ethanol and stir fully to obtain a suspended mixture of strontium aluminate long afterglow luminescent powder and anhydrous ethanol.
Step 2: At 20℃, stir the mixture continuously, at the same time add 0.24g concentrated phosphoric acid solution to 0.01ml/s, and continue to stir for 2 hours after the drip is finished.
The third step: the mixture obtained in the second step is left for 24 hours at 20℃, then centrifuged to remove the residual reaction liquid, washed with anhydrous ethanol for 3 times, and finally put into the automatic temperature control of 70℃ electric heating constant temperature blast drying oven for 6 hours, and the surface is coated with strontium aluminate long afterglow luminescent powder.
Step 1: Pour an organic solvent 11 or a combination thereof into a container 12, as shown in Figure 1, where the liquid solution 11 May be water or a volatile liquid, such as methanol, ethanol, propanol.
Step 2: The viscous particle 22 with small particle size is uniformly attached to the luminescent powder 21 with large particle size (as shown in Figure 2) by stirring method, and then placed in the container 12 of Step 1, so that it can interact with the liquid solvent 11 in the container 12 of Step 1 to generate a luminescent powder layer 3. As shown in FIG. 3, or by stirring, particles of equal particle size are uniformly close to luminous powder of equal particle size.
Step 3: Stand the luminous powder layer 3 of Step 2 so that it floats evenly to an appropriate height h(A+B+C), as shown in Figure 3.
Step 4: When the luminescent powder layer 3 of Step 3 reaches the appropriate height h, a relative substance 4 with the height h of the luminescent powder layer 3 can be added to control the height h of the luminescent powder layer 3 to form finished powder 31 or 32, as shown in Figure 4.
Step 5: The finished powder 31 or 32 of Step 4 is placed on a carrier (substrate)5 by spraying or coating or dot, etc., to form a membrane 6 or colloid 6, as shown in Figure 5.
Step 6: Fuse the film body 6 or colloid 6 of Step 5 with the carrier (substrate)5 by means of natural air drying, heating or ultraviolet irradiation, and then spray a transparent and non-shading protective layer 7 on the outermost layer to complete the final product, as shown in Figure 6, where the protective layer 7 can be silicone or silicone or epoxy resin or SiO2.