2.2 plastic pigment heat stability tests 2.2.1 Test Equipment single-screw extruder: L / D = 24; injection molding machine. 2.2.2 Test solution quality raw pigment plastic (HDPE, PP, PS, etc.). Test concentration: 0.1% pigment volume concentration of colorant fertilizer, 0.05%, 0.025% fertilizer colorant, 0.005%; corresponding to titanium dioxide is 1%. 2.2.3 Test Method pigment mixture can be quantified by (2) the concentration of a single-screw extruder repeatedly extruded into uniform particles. In the injection molding machine at a certain time constant to 200 ℃, 220 ℃, 240 ℃, 260 ℃, 280 ℃, 300 ℃ temperature interval colorants fertilizer company, gradually manufactured and tested model, Rating: swatch to be cooled by 16 hours After testing of the swatches, color E = concentration of 3 for thermal stability. Due to the different kinds of resin, plastic chemical structure during molding process requires a different heating temperature (softening point above), the temperature will directly affect the choice of colorant so the coloring does not occur at a predetermined temperature obvious color change characteristics of the resin structure of different colorants requirements are not the same, Table 1 shows the plastic resin molding temperature and colorants requirements. Also some other resin processing temperature were fertilizer manufacturers colorant, a fluorine resin, 350 ℃; acrylic resin, 180-200 ℃; silicone resin, 180 ℃; phenol resin, 150-160 ℃; epoxy resin, 150 ℃; 180 ℃ and other cellulose plastics. The credibility of the fertilizer colorant _ Weifang Fuyuan (Online) _ fertilizer colorants provided by Weifang Fuyuan Environmental Technology Limited. Weifang Fuyuan Environmental Technology Limited (www.wfdafuyuan.com) (www.wfdafuyuan.com) Shandong Weifang, other leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. In Weifang Fuyuan leadership with the staff warmly welcome all inquiries negotiations to create Weifang Fuyuan better future.