Two component powder coating system and method for coating a heat sensitive substrate therewith
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TABLE 2 ______________________________________ EXAMPLE 1 2 3 4 Control ______________________________________ MEK Moderate Rubs No Moderate Rubs Resistance Rub Off Through Effect Rub Off Through (50 Double Rubs) Impact 140 in-lbs 80 in-lbs 60 in-lbs 100 in-lbs 0 in-lbs Resistance (Direct) 60.degree. Gloss 40 15 78 32 80 Orange Peel Slight Moderate Slight Very Slight Slight ______________________________________
TABLE 3 __________________________________________________________________________ Examples 5-8 Line Preheat Mek Rate Speed Setting Line Speed in Actual Temp. 50 Double Thick- Ex. # Powder Substrate of Coating IR or Conv. Curing Oven
Exiting IR Appearance Rub ness __________________________________________________________________________ 5 Ex. 1 MDF 30 ft / min None 5 ft / min 290.degree. F. No outgrassing / slight #4llow 4+ Low Gloss / Smooth 6 Ex. 1 MDF 30 ft / min None 6 ft / min 240.degree. F. Slight Outgrassing / white #3 4+ Higher Gloss / Slight OP 7 Ex. 1 MDF 30 ft / min None 5 ft / min 260...
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The coating powder of Example 16 is the same as that of example 1 except for the addition of 0.1 part by weight of an optical brightener to both Components A and B. The coating powder of Example 17 is the same as that of Example 16 except for the addition of 1.0 part by weight of IRGAFOS 168 anti-oxidant to both Components A and B of the powder of Example 16. The coating powder of Example 18 is the same as that of Example 16 except for the addition of 1.0 part of IRGANOX 1425 to both Components A and B of the powder of Example 16. A coating powder of Comparative Example 1 is the same as the powder of Example 16 except for the addition of 1.0 part of IRGANOX 1098 to both Components A and B of the powder of Example 16. The powders of Examples 9 and 16-18, as well as the powder of the Comparative Example were deposited by a hand-operated tribocharging gun on to a surface of a 0.5 inch thick wooden panel whose temperature was about 230.degree.-250.degree. F. and then cured at 300.degree...
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