UV Curing of Coatings and Paints

UV curing of automotive refinish coatings represents a powerful tool providing a fast curing process and improving the productivity of paint shops. The... 

Figure 3.3-4. Concentration vs time profiles for emission of selected VOCs from coated surfaces and cabinet furniture. A limonene (ECO, painting) B tripropyleneglycol diacrylate (UV-cured, roller coating) C benzophenone (UV-cured, roller coating) D l-butanol-3-methoxy-acetate (NC, spray coating). The upper and lower curves in C and D represent cabinet air and chamber air, respectively. The test chamber conditions were T =23 °C, r.h. = 45 %, V = 1.0 h L = 1.0 rrfixtf.

The IR real-time monitoring method is versatile with respect to sample thickness. At a thickness exceeding 0.5 mm, measurements can be performed at overtone bands of weak absorption, whereas in the case of thin layers (<2 pm) the attenuated total reflectance ATR) method (see Section 2.2.1) is applicable. Generally, this method is well suited to monitoring the UV-curing of varnishes, printing inks, and paints that have been coated onto metallic substrates. 

The coating is applied by traditional trade practices, namely, using rubber squeegees and paint rollers. The applied coating is cured by a mobile curing unit, which consists of a cart housing power supply for the UV lamp (see Figure 111)T If the concrete is porous, a seal coat should be applied (aqueous UV curable polyurethane dispersion (PUD) is recommended). 

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