The invention discloses a
carbon dot-
engineering plastic
composite coating for optical
temperature measurement and a preparation method thereof. The
carbon dot-
engineering plastic
composite coating comprises the following components in parts by
mass: 1-20 parts of carbon dots; and 1-3 parts of
engineering plastic. The preparation method comprises the following steps: adding deionized water into a
citric acid raw material and an
arginine raw material to obtain a solution A, adding
formic acid, adjusting the pH value of the solution, adding the solution into a reaction kettle, placing the reaction kettle in a
drying oven, heating to obtain a solution B, performing centrifugal purification and
drying to obtain an oily substance C, mixing the oily substance C with an
engineering plastic solution to obtain a mixture D, pouring the mixture D into a spray cup, spraying the mixture D on a substrate, and performing
drying to obtain a finished product. And putting into a drying oven for firing. The
composite coating disclosed by the invention not only can be used as a
luminescent material to be widely applied to the fields of frictional wear, non-
contact temperature measurement, equipment surfaces and the like, but also can be used for measuring the temperature of the surface of
mechanical equipment through the composite
coating, so that the use efficiency of the equipment is improved, the service life of the equipment is prolonged, and the use safety is improved.