Лако-красочные материалы — производство

The use of CAB in these systems improves flow and levelling and reduces the tendency for ‘fish-eyes’. There are many different grades and viscosities available. All have a hydroxyl value and will, therefore, react with the isocyanate to reduce the solvent sensitivity of the CAB. Suppliers include Eastman Chemicals and Bayer. Silicones can be used […]

There are several types offering different end properties. Aromatic isocyanates are fast curing, giving rise to harder films, but have a tendency to yellow. Aliphatic isocyanates are slower curing but non yellowing and give more flexible and resilient films. Suppliers of isocyanates include Bayer, Akros, Huls and Baxenden.

Alcohols cannot be used as they will react with the isocyanate and radically affect the properties. Solvents used must have very low levels of water and alcohols present as impurities

by Graham Raynor BSc Two pack acrylic polyurethane coatings offer some excellent properties including:- • long pot life • short touch dry times • early sandability • very good chemical and stain resistance • excellent durability (aliphatic isocyanates) • good mar resistance • high solids (lower VOC) However historically the woodfinishing industry has been dominated […]

This includes the finishing of buses, trams, lorries, rolling stock, trailers and coaches. The main performance requirements of this sector include: • adhesion • chemical resistance • abrasion resistance • durability • high gloss During their lifetime commercial vehicles are subjected to considerable stress through long running times and higher sustained speeds for greater distances. […]

The two pack acrylic polyurethane was introduced to the automotive refinish markets in the 1970’s as an alternative to the existing synthetic cellulose and thermoplastic acrylic systems. Although their development in this market was rather slow, by the late 1980’s the polyurethane coating dominated the refinish market of Western Europe. The advantages offered by the […]

by Kevin O’Hara LRSC and Morrison Barbour BSc (i) Automotive OEM Traditionally acrylic/melamine and alkyd/melamine systems have been used for high quality original finishes on automobiles. Two component acrylic urethane used in some OEM applications offer: • low cure temperature • excellent durability • high solids/low VOC • high gloss • chemical resistance, especially to […]

The main sectors where these versatile 2 pack acrylic polyurethane systems are used include: • Automotive OEM • Vehicle refinishing • Transport finishes • Industrial wood finishing • Floor finishes • Aircraft coatings • Marine coatings • Industrial maintenance coatings • Coatings for plastics • ACE coatings • General industrial coatings With the advent of […]

The high performance characteristics of two pack acrylic polyols has led in the last two decades, to its use in a diverse range of sectors. The variety of application methods used in those sectors include: • brush • roller • conventional spray • air-assisted airless spray • airless spray • electrostatic spray • airless electrostatic […]

1. Curing The crosslinking reaction illustrated earlier in this section takes place at temperatures from just above 0°C upwards, producing levels of performance similar or, in some cases, superior to high quality stoving systems. The possibility of achieving very high performance coatings using a room temperature curing system has resulted in their use in a […]