ALPEX® CK 450/PAST

• ALPEX® CK 450/PAST differs from ALPEX® CK 514 in having higher viscosity and lager compatibility with mineral oils.
• ALPEX® CK 514 is less inclined to cause misting. It is the preferred product for addition to letterpress inks for high-speed printing machines.

Paints:

Application and Drying of the Paints:

• When paint systems are applied in several layers, each coat should be allowed to dry for about 1-2 days but not longer. After about 14 days, paints that are required to be highly resistant to chemicals will have through-hardened adequately.

Processing:

• ALPEX® CK 450/PAST is fully compatible with the pigments normally used. When pigments containing iron, manganese, or lead compounds are used, particularly in the presence of dryers, the storage stability of the paints is adversely affected. The suitability of such pigments should therefore be checked separately in each case.
• As a general principle, no dryers should be used in red-lead paints which contain ALPEX® CK 450/PAST.
• As a rule, only small quantities of dryers need to be used in combinations of ALPEX® CK 450/PAST with alkyd resins, e.g., 0.02–0.03% Co metal, calculated on solid Alpex.

Antiskinning Agents:

• ALPEX® CK 450 also is crosslinking by oxidation. Therefore, the addition of antiskinning agents like ADDITOL® XL 297, approx. 1.5% calculated on solids of ALPEX® CK 450, is recommended.

Printing Inks:

• ALPEX® CK 450/PAST can be easily dissolved in mineral oils either by heating to about 180°C or by using a high-speed-solving process. The entertainment of air during mixing should be avoid to prevent changes in compatibility due to oxidation and consequent increases in viscosity. Blanketing with inert gas is recommended.

Printing Inks:

• It is readily compatible with mineral oils used in offset and letterpress inks. Because of the non-polar structure, ALPEX® CK 450/PAST reduces emulsification of offset inks with the dampening agent employed. It improves ink transfer, and provides prints with good scratch resistance immediately after printing. When suitably formulated, it also improves gloss. The ALPEX® resin has good resistance to chemicals. ALPEX® CK 450/PAST can be used in screen printing inks for various purposes including the production of printed circuits. In gravure printing the ink transfer properties are improved and flocculation of pigments is reduced.

Compatability:

 ¹ - Part resin: x parts PKWF 4/7.
² - Turbidity titration with PKWF 28/31 af.
³ - Turbidity titration with ethanol.

Test Formulation: 10 g of the 40% resin solution in linseed oil diluted with 30 g xylene and titrated with ethanol until turbidity appears.

• Chemically resistant paints for internal coating of tanks, pipelines and equipment where the paint is in continuous contact with aggressive media such as acids, alkalis or salt solutions. These paints are not resistant to weathering.
• Paints with limited resistance to chemicals primarily for interior surfaces continuously exposed to less aggressive media.
• Anticorrosion paints with limited or short-term resistance to chemicals for plant structures in the open.
• Weather-resistant anticorrosion paints for plants and steel buildings exposed to corrosive atmospheres, as in industrial or coastal regions. Other uses include heat-resistant paints (up to 200°C), concrete paints, underwater paints, road-marking paints, zinc-rich paints and stoving enamels.

At temperatures up to 25 °C storage stability packed in original containers amounts to at least 365 days.