How is the Conditioning (artificial acceleration) performance of the film determined?

The aging (artificial acceleration) performance of the coating film can be determined by the method in the national standard GB/T 1865-80 "Determination of Paint Film Aging (Artificial Acceleration)". This standard applies to the assessment of the weather resistance of paint films. The artificially accelerated weather resistance Test Chamber is used to evaluate the grade based on the degree of damage to the appearance of the test panel.

(1) Materials and equipment

Artificial accelerated weather resistance Test Chamber

Light source 600oW water-cooled tubular xenon lamp l Distance between test board and light source: 35~40cm.

b. Voltage stabilizer CZ-63 magnetic saturation voltage stabilizer or other voltage stabilizer.

② Test water: distilled water is used for cooling the xenon lamp, and water purified by ion exchange resin is used for rainfall.

③Other materials and inspection equipment are the same as those specified in GB/T1767-79l "Determination of Atmospheric Aging of Paint Films".

(2) Test conditions

①Temperature The air temperature in the working room is 45℃±2℃.

②The relative humidity is 65%~75%.

③Rainfall cycle It rains for 12 minutes every hour.

For special-purpose paints, the test conditions can be selected according to the use environment and requirements.

(3) Experimental steps

①According to the product standard, select the base material and supporting primer according to GB/T1765 "Preparation method of paint film for resistance to heat and humidity, salt spray and weathering (artificial acceleration)" to make each test panel.

② Test two test panels for each variety, and record the original state of the test panels before testing.

③Put the test panel into the central rack of the test panel, insert it into the drum of the Climate Chamber, start the machine according to the operation rules of the Artificial climate Chamber, and carry out the test under the test conditions.

④ Start to stop the machine every 48 hours to check the test plate, and then check it every 96 hours after 192 hours. After each inspection, the positions of the test plate and the bottom are exchanged.

⑤ The termination index should be determined according to the degree of aging and damage of various paint films and specific requirements. Generally, the test can be stopped when the damage of the paint film reaches any one of the "bad grades" in the comprehensive rating of GB/T1766 "Paint Film Aging Test Evaluation Method".

(4) Inspection and rating of the test panel Take off the test panel, dry the water droplets on the back with a towel, place it on the test bench face up to dry, and then immediately inspect it according to GB/T1766 "Grading Method for Paint Film Aging Test". Check and grade.