In order to produce polymer concrete, mineral casting or epoxy granite, polymer binders, synthetic resins or reactive resins are needed, as well as rock formations. Comparable to common concrete, it is not a cement matrix, but a resin matrix which binds the aggregates in concrete.
At the moment, systems of unsaturated polyesters (UPE) which are usually solved in styrene are commonly used. Besides unsaturated polyester resins also epoxy resins are used in polymer concrete / mineral casting.
Company Robert Kraemer [Link auf Homepage] has developed new binding systems based on polyurethane chemistry for use in polymer concrete or mineral casting which are distributed under the trade names Rokrapol [hier Link auf Rokrapol] and Bremar [hier Link auf Bremar]. These synthetic resin systems are composed of a polyol resin and an isocyanate component hardener, which form the binder matrix for polymer concrete, using suitable additives.
The concrete / cement based on our binders show high compressive strength and flexural strength / tensile strength, significantly exceeding common concrete. In comparison to common polymer concrete based on unsaturated polyesters and styrene, binders by Robert Kraemer have significant advantages. Noteworthy are the improved chemical resistances, e.g. against biogenic sulfuric acid, which commonly cause problems during canal construction, as well as the anaerobic lactic acid fermentation which can be found in silage silos or bio gas plants.
The new polymer concrete is also well suited for high demands on machine groundings, due to its low shrinking properties. Last but not least, using the new Kraemer resins provides a great option to significantly increase the percentage of renewable raw materials in polymer concrete.