光固化涂料新进展、新应用

UV/EB
Economical Ecological Performance
Drawbacks Still solvent containing Long curing time
Weak chemical resistance Difficult to dry Foaming Narrow process window Orange peel structure Expensive Long curing time Higher raw material costs Difficult cure of pigmented coatings……
Reinhold Schwalm. Elsevier Science (December 21, 2006)
1. Introduction to Coatings Technology
➢ Coating Markets and Market Prospects ➢ UV Coating Markets and Market Prospects ➢ UV Technology and Applications ➢ Advantages and Drawbacks of UV Coatings ➢ Eco-Efficiency ➢ Driving Forces of UV Technology ➢ Current Topics and Trends in UV Technology
Photoinitiators are commonly used in the case of UV exposure, since the direct cleavage processes are not efficient enough.
The UV curing process and UV induced cross-linking
• Reducing odor (of the formulations)
• Reducing extractables of cured coatings
• Improving photoinitiators (cost, migration, volatility)
• Direct food contact packaging approval
➢ Wood coatings: • Products with less extractables • Products with high scratch resistance • Spray coating of 3 D objects ➢ Graphic arts: • Inks and overprint varnishes (OPV’s) with
UV coatings – from traditional to new applications
Comparison of advantages and drawbacks of future coating technologies
Coating
Advantages
High solids Excellent properties Ease of handling
➢ Metal coatings:
• Products with good adhesion • Products for coil coatings • Weather resistant coatings for
1. Automotive OEM 2. Automotive refinish
CURRENT TOPICS AND TRENDS IN UV TECHNOLOGY
• UV curing in the presence of UV stabilizers decelerated
• Oxygen inhibition at the surface (in many radical curing systems)
• Sensitivity to moisture (cationic curing system)
➢ Trend at raw material suppliers: • Become a solution provider to customer’s problems • Work on segment and customer specific innovations • Active participation in panels to follow the changes in
legislation related to health, safety, working hygiene and environment • Globalization of services and standards
CURRENT TOPICS AND TRENDS IN UV TECHNOLOGY
• Low Biblioteka Baiduubstrate heating • High product durability • Application versatility • High scratch resistance and chemical resistance • Exceptional abrasion, stain and solvent resistance • Superior toughness
ADVANTAGES AND DRAWBACKS OF UV
➢ Drawbacks
COATINGS
• Material costs are higher than, e.g., alkyds, polyesters or epoxies
• 3D curing equipment development is in its infancy
Electromagnetic energy spectrum
The energy content of a photon is defined by the equation
光子能量: E = hν = hc /λ
Energies as a function of wavelength in comparison to bond energies
➢ Trend at coatings manufacturers: • Short lead-time to meet new legislative regulations • Reduced numbers of suppliers and raw materials • Transfer formulation development towards the raw material
ECO-EFFICIENCY
Eco-efficiency portfolio for coating of 1000 wooden door fronts
DRIVING FORCES OF UV TECHNOLOGY
CURRENT TOPICS AND TRENDS IN UV TECHNOLOGY
manufacturer
2. The UV Curing Process
• Interaction of UV Process Parameters • Photochemical Process • Equipment
✓ Coating Application Processes ✓ Exposure Process ✓ UV Line Equipment ✓ Exposure Parameter Measurement ✓ UV Coating Line Examples
approval for food packaging • Inks and adhesives for DVD’s • Ink jet
CURRENT TOPICS AND TRENDS IN UV TECHNOLOGY
➢ Plastic coatings:
• Adhesion promoters • Adhesives for DVD and flat panel displays
World market of UV curable formulations in main segments (2004)
UV coating market consumption of China and Japan in 2004
UV TECHNOLOGY AND APPLICATIONS
• Difficult through-cure of pigmented coatings (at thicknesses >5 μm)
➢ Topics to eliminate weaknesses
• Improving adhesion to metal, plastics
• Minimizing skin irritation caused by some reactive diluents
supplier • Provide package of services and problem solutions • Even smaller companies must become global ➢ Trend at end-users: • Short lead-time to meet new legislative regulations • Reduced numbers of suppliers • Transfer of development activities towards the coating
ADVANTAGES AND DRAWBACKS OF UV
COATINGS
Economical advantages
• Energy saving (commonly rapid cure at room temperature) • High production speed • Small space requirements • Immediate post cure processing possible
UV Coating Markets and Market Prospects
Regional split of global UV radcure market
Sectorial split of global UV radcure market
Market of industrial coatings in Europe and share of UV acrylates
Basics, Recent Developments and New Application of UV Coatings
Introduction to Coatings Technology The UV Curing Process Raw Materials Formulations Recent Developments New Applications
The Main Functions of a Coating
decorative
and/or
barrier
COATING MARKETS AND MARKET PROSPECTS
VOC Regulations
Market development of industrial coatings by technology and region
Users are familiar with
solvent-based coatings
Waterborne Low VOC
Wide range of properties,
application techniques
Powder
100% solids Environmentally nearly ideal
Ecological advantages
• In general solvent free formulations (VOC reduction) • Possibility of easy recycling (waste reduction) • Energy saving
Performance advantages