Лако-красочные материалы — производство

(i) UV Absorbers UV absorbers are an essential component of clear lacquers for external applications. Recent studies suggest their use should be extended to pigmented top coats to enhance exterior durability. The UV absorber system normally consists of a UV absorber, such as the benzotriazoles or oxalanilide types, and a radical scavenger, such as hindered […]

In general, alcohols, esters, ketones and ether esters are true solvents for acrylic resins. These are normally used in conjunction with aromatic hydrocarbon diluents such as xylene and the higher boiling trimethyl benzenes. However, the effects of solvents in terms of miscibility, dilution, evaporation and chemical interaction are highly specific to each of the technologies, […]

Pigmentation of a coating, in general, can be carried out by one of two processes. The first involves the use of a tint base scheme, where the mill base vehicle is either universal to the tint base scheme, or the final coating resin. In the case of the universal tint base, it is critical that […]

1. Modifying Resins In a general sense, many resins can be utilised to modify the properties of acrylic resins. The main modifying polymers presently used include cellulose acetate butyrate, vinyl resins and nitrocellulose. These are used to alter the flow, gloss, sandability, hardness and flexibility of the cured film when utilised at the optimum level. […]

I INTRODUCTION Since they were introduced in the early forties, two pack coatings based on polyurethane technology have begun rapidly to play a dominant role in a large range of industrial applications (see isocyanate/acrylics chapter). For example, they have largely replaced traditional nitrocellulose and air drying alkyd based enamels for vehicle refinishing. The use of […]

Listed below are the major European resins manufacturers who offer hydroxy functional acrylics for cross Unking with isocyanate adducts. TABLE 5-7: MAJOR 2K ACRYLIC RESIN MANUFACTURERS AND TRADE NAMES Manufacturer Trade Name Hoescht Macrynal Bayer Desmophen Cray Valley Synocure BASF Lumitol Koch/Synthapol Synthalat Jaeger Jaqertex DSM Synedol Synthese Setalux

Dr. Manfred Schonfelder^ illustrated the effects of polyurethane finishes on the mechanical properties of the plastic. The abstract describes the propagation of a crack from the coating through to the plastic substrate. The formation and growth of cracks can be impeded and hence the damage to the component restricted, by a variety of methods: a) […]

IT finishing systems have long used acrylic polyurethanes to provide a tough abrasion resistant finish to computers, telecommunication equipment, etc. The substrates are often plastic, but can also be steel or aluminium. The requirements for exterior durability are less stringent than in ACE, but abrasion resistance requirements are even higher, due to the greater amount […]

ACE finishes are commonly formulated using acrylic urethanes. The reasons are as outlined above. In particular, only an ambient cure coating technology is suitable on such large metal components. Historically, air drying alkyds were used in this business, but the drive towards more durable and tougher coatings has led to the switch to polyurethanes. The […]

Industrial protective coatings cover heavy duty, maintenance and marine systems including coatings for structural steel, ships, tanks, off shore installations, mining, oil and gas pipelines and refineries. In the case of topcoats, the two pack acrylic polyurethane almost invariably uses aliphatic isocyanates because of their excellent appearance characteristics and long term durability. The carbon carbon […]