METHOD FOR CURING THERMOREACTIVE POLYMER POWDER COATINGS Russian patent published in 2018 - IPC B05D3/02 

FIELD: technological processes.

SUBSTANCE: method involves measuring, recording and monitoring the values ​​of the physical state parameters of the coating in the form of electrical signals proportional to the changes in the intensity of the heat radiation of the coating surface, representing it as a graphical dependence on the temperature in the working volume. At the same time the measurement and recording is done as a graphical dependence on the temperature, the value of the coating surface thickness and the reflection index. The graphical dependences of the above parameters are compared with a chart of the working temperature changes in the chamber. The average values of stabilization time of the specified parameters are defined by mathematical processing via an electronic device. The obtained average values are compared with the value of the temperature stabilization time in the working volume upon the completion of inertial processes and define their sum by the results of the comparison. Mathematical calculations are done by subsequent summation of received values and values of polymerization stabilization time, set graphically, and then compared with the value of the technologically set process end time, and the required estimated time of full coating curing is determined. The difference between the obtained average values of the parameter stabilization time and thermodynamic equilibrium time in the working volume is calculated. Then the differences are summed up with the value of the technologically set polymerization temperature time. The desired point of the final coating curing is determined by the equality or difference of the calculated time value with the preset end time of the coating process.

EFFECT: ensuring the determination of the point of the final coating formation after the completion of the inertial processes during heating in the working volume of the chamber, taking into account the influence of the temperature increment on the coating formation processes in the working volume for the time interval during which the temperature increases and then decreases to a technologically set level, that ensures the quality of the resulting coating from thermoreactive polymer powder compositions.

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