some powder coating problem and solution

In the use of powder coating may sometimes encounter some adverse symptoms, and these symptoms have what? Faced with these symptoms, we have to how to solve it?

Adverse symptoms: powder coating

Reason: 1, powder coating storage stability is not good, or in transport or storage compression;

2, powder coating storage is not good, absorb moisture; ultra fine powder content is too much.

Solution measures:

1, without moisture absorption to crumble, sieving after use. The fundamental problem is to improve the resin glass temperature, or 30 degrees C the following low temperature storage;

2 at low temperature and dry powder, remove moisture, crumble, sieving; powder coating, reduce the content of ultrafine powder.

Symptoms two: orange surface coating

Reasons: 1, spraying coating is uneven; 2, the degree of atomization powder is not good, there are gun powder phenomenon; 3, low curing temperature; 4, powder moisture, powder particles are too thick; 5, the workpiece grounding bad; 6, the baking temperature is too high; 7, the film is too thin.

Solution: 1, the coating film thickness uniformity; 2, adjust the spray gun; 3, a moderate increase in curing temperature; 4, for the use of dry powder; 5, so that the workpiece grounding; 6, a moderate reduction in the baking temperature.

Adverse symptoms three: paint adhesion efficiency

Reasons: 1, the electrostatic generator voltage is too low, charging effect is not good; 2, the friction gun, the friction performance of powder coating is 3, recovery of excessive amount of powder coating, powder coating; air amount of 4 super fine powder content too much or spraying room is too large; 5, powder coating particles too the proportion of coarse or too big.

Solution: 1, 2, to improve the voltage change of corona discharge to charge electrostatic spray gun, or change the powder coating varieties; 3, reduce the recovery amount of powder coating; reduce superfine powder in powder coating, or reduce the amount of ventilation dusting room; 4, adjust the size and density of powder coating by. Four adverse symptoms: powder layer of honeycomb.

Adverse symptoms five: paint color is not positive, yellow

Reason: 1, the heat resistance of powder coating is poor; 2, baking temperature is too high or baking time is too long.

Solution: 1, change the heat resistance of a good powder coating; 2, reduce the baking temperature or shorten the baking time.

Adverse symptoms six: the impact strength of the film

Reason: 1, baking temperature can not reach the process requirements of temperature; 2, baking time is less than the process requirements; 3, powder coating quality is not good, including its quality and storage quality decline.

Solution: 1, check the baking temperature, control to the requirements of the process conditions; 2, to extend the baking time, control to the process requirements of the time; 3, for powder coating or restructuring.