Heat resistant pigments with refers to the processing and use of the temperature degree of change the color of the paint or performance. In PVC, PE paint shall be capable of 160-180 ℃; ABS, PS should be in 250-280 ℃ processing; PP, PA, PET, is as high as above 280 ℃. It is worth noting that in considering paint temperature resistant at the same time, to consider its heating time. For in processed into plastic products, processing methods, heating time is different; In use process, USES different, different heating time, half of the requirement for paint heat resistant time of 4-10 min. As a general rule, the higher the temperature, heat time shorter.

Heat resistant temperature of the paint has the following several ways and the test of time.

(1) color plastic under 180 ℃ respectively plasticate 5, 10, 15 and 20 min, and observes its color change.

(2) coloring plastics in 220 ℃, 200 ℃, 200 ℃ and 180 ℃, plastication 5 min, compare the color change.

(3) coloring plastics injection molding machine with a plunger type, respectively, in 180 ℃, 230 ℃, 250 ℃ and 280 ℃ temperature, under the condition of injection molding cycle for 10 min, observe its change color or color difference Δ Eab = 3 when the temperature of the heat temperature.