Curing of coatings

The Curing of Coatings with UItra-Uiolet Radiation, D8667 G.D., Tioxide of Canada, Sorel, P.Q., Canada. 

Curing of Coatings with Electron Beams, y-Ray, X-Ray, and Planar Cathodes... 

Chemical Properties. MSA combines high acid strength with low molecular weight. Its pK (laser Raman spectroscopy) is —1.9, about twice the acid strength of HCl and half the strength of sulfuric acid. MSA finds use as catalyst for esterification, alkylation, and in the polymerisation and curing of coatings (402,404,405). The anhydrous acid is also usefijl as a solvent. 

If the reactive species in the chemical activation step initiates a radical chain with a chain length CL, then the overall quantum yield based on the ultimate product is X CL, and can be greater than 1. Photons are rather expensive reagents, and are only used when the product is of substantial value or when the overall quantum yield is large. Examples are the use of photoinitiators for the curing of coatings (a radical-polymerization process (Section 7.3.1)), and the transformation of complex molecules as medications. 

Koleske, J. V., Radiation Curing of Coatings, ASTM International, West Conshohocken, PA, p. 30 (2002). 

Low-pressure mercury lamps consist most frequently of a quartz cylinder with electrodes on both ends, although other shapes are also produced. Inside the lamp is a mixture of mercury and argon at a pressure of 10 to 10 Torn The emission from this lamp is 254 nm, and with high-quality quartz, some light with 189 nm wavelength is produced. Low-pressure lamps are of low power, and therefore are not used for the cure of coatings, but are well suitable for applications where slow cure rate is tolerated, such as liquid crystal displays or in resist technology for the production of microchips. 

UV Curing of Coatings and Inks on Cylindrical-Shaped Parts... 

Standard UV equipment and clear coats cannot ensure curing of coating in the shadowed areas. 

Narey B., Conference Proceedings, Innovation in Plastics Plastics Technologies for A Global Competitive Edge, Rochester, NY, September 18-19, 1990, Paper J.012. Koleske, J.V., Radiation Curing of Coatings, ASTM International, West Consho-hoken, PA, p. 216 (2002). 

An example of EB curing of coatings is shown in Figure 8.12 and that of a curing line for hybrid UV/EB process in Figure 8.13. 

Photoinitiated polymerization and crosslinking of monomers, oligomers, and polymers constitute the basis of important commercial processes with broad applicability, including photoimaging and UV curing of coatings and inks. 

UV Cure Mechanisms. There are two fundamental mechanisms for the uv curing of coatings free radical and cationic. The more common free radical mechanism consists of a chain reaction with four primary steps ... 

Potential Energy Savings By Using Electron Curing of Coatings on a Coll Coating Line... 

---