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Handbook of Solvents - George Wypych - ChemTech - Ventech!

Handbook of Solvents - George Wypych - ChemTech - Ventech!

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14.19.1 Architectural surface coatings 965<br />

The following are examples <strong>of</strong> architectural surface coatings.<br />

14.19.1.2.1 Concrete coating materials<br />

According to DIN 1045 concrete must be protected against aggressive substances if the<br />

chemical attack is severe and long-term. These are the requirements:<br />

• Good adhesion<br />

• Waterpro<strong>of</strong> and resistant to aggressive substances and resistant to the alkalinity <strong>of</strong><br />

the concrete<br />

• Deformable<br />

To realize these requirements, the following technical solutions can be applied:<br />

• The use <strong>of</strong> paint coatings based on duroplast or thermoplastic substances<br />

• Surface treatment - impregnation<br />

Protective coatings based on polymers are used in construction with and without fillers<br />

and with or without reinforcing materials (fibers).<br />

The following techniques are generally used:<br />

• Film forming paint coatings (brushing, rolling, spraying).<br />

• Coating (filling, pouring).<br />

During application, the coating materials are normally liquid and subsequently harden<br />

by evaporation <strong>of</strong> solvents or as a result <strong>of</strong> chemical reactions.<br />

The common coating systems for concrete are listed in Table 14.19.1.2. Synthetic resins<br />

(e.g., chlorinated rubber, styrene resins, acrylic resins) contain normally 40-60% solvents<br />

and form a thin film. Several coats must be applied. Reactive resins may require little<br />

or no solvent.<br />

Table 14.19.1.2. Survey <strong>of</strong> <strong>of</strong>ten used coating systems for concrete<br />

Film-forming agents Hotmelts<br />

Film-forming<br />

agents dissolved<br />

Film-forming<br />

agents emulsified<br />

Reaction resin<br />

liquid<br />

Bituminous substances + + +<br />

Synthetic resin + +<br />

Reactive resins (+) (+) +<br />

14.19.1.2.2 Coating materials for metals<br />

Wet coating processes are detailed in Table 14.19.1.3.

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