Лако-красочные материалы — производство

Some important physical and chemical characteristics of solvents from the standpoint of their use in paints and coatings are discussed below. 4.1.1 Solvency Dissolving a resin to yield a solution with viscosity suitable for appli­cation is one of the primary roles of solvents in paints and coatings. Therefore, solvency is the foremost performance requirement of […]

As described in the previous chapter, intermodular interactions between solvent molecules are very important in determining the strength of the solvent in dissolving a polymer. The concept of a solubility parameter was introduced by Hildebrand for its applica­tion to mixtures of non-polar liquids. The concept was derived from considerations of cohesive energy density, which is […]

In the early phase of coating technology, due to the small number of binders, empirical selection of solvents had been adopted with the general rule of like dissolves like. But after around 1930, when a more diverse variety of synthetic binders was introduced, selection of solvents based on this rule became more difficult. As a […]

4.1 Introduction According to DIN EN 971-1, solvents are defined as liquids compri­sing one or more components that are volatile under the specified drying conditions and capable of dissolving binders purely physi­cally without any chemical reactions. Most resins used as binders for solventbased or high-solid coatings are solids or viscous liquids that need to be […]

This is relatively newly developed group of high performance orga­nic pigments. They offer a range of medium orange to bluish-red hues. These pigments gained importance in high grade indus­trial coatings, especially auto­motive finishes, because of their bright shade, good opacity, excellent heat stability and resistance to solvents along with excellent light and weather fastness properties. […]

Dioxazine pigments are a small but important class of high per­formance organic pigments derived from triphenodioxazine. They are extremely light fast and weather fast pigments with good to excellent solvent and migration resistance. They are used both in coatings and printing inks. They offer a unique, clean violet hue that cannot be achieved by blending […]

These pigments also originated from the vat dye route. They have very little practical significance in the coating industry. Only chlo­rinated and methylated thioindigo derivatives have any noticeable commercial presence as pigments. They provide a range of colors from red-violet and maroon to brown shades based on the type and position of the substituents. They […]

Perylene and perinone pigments (Figure 3.18) are a class of high performance organic pigments. Perylene pigments are diimides of perylenetetracarboxylic acid while perinone pigments are produced by condensation of naphthalenetetracarboxylic acid with aromatic diamines. They originated from vat dyes. Perylene pigments exist in a wide range of hues, providing red, bordeaux, violet, brown and black […]

Anthraquinone pigments are members of the pigment family origi­nating from vat dyes, which are structurally or synthetically derived from the anthraquinone molecule. The basic anthraquinone mole­cule is normally too small to give good pigmentary properties, and therefore, molecular enlargement is done via different reactions to yield commercial grade products with good pigmentary properties. They are […]

These are high performance organic red and violet pigments. Despite their high price, due to their outstanding light and weather fastness and solvent and migration resistance, they are used in high grade industrial coatings, automotive finishes, and special printing inks. Pigment Violet 19 (Figure 3.16) is the basic unsubstituted qui­nacridone molecule, which can exist in […]