The mechanical property known as "strength at young ages" of cement
matrices or hydraulic binders may be significantly improved by adding
dispersions of mineral fillers and dispersing agents. The dispersing
agents of the present invention comprise copolymers prepared by the
radical copolymerization of at least one alkoxy-, aryloxy-, alkylaryloxy-
or arylalkyloxy-polyalkylene glycol ethylenic urethane monomer with at
least one anionic monomer and at least one non-ionic monomer, and
optionally, an alkoxy-, aryloxy-, alkylaryloxy- or
arylalkyloxy-polyalkylene glycol acrylate or methacrylate or an alkyloxy-,
aryloxy-, alkylaryloxy- or arylalkyloxy-polyalkylene glycol allyl ether,
and/or a crosslinking agent.
A propriedade mecânica sabida como a "força em idades novas" de matrizes do cimento ou de pastas hidráulicas pode significativamente ser melhorada adicionando dispersões de enchimentos minerais e dispersando agentes. Os agentes dispersando-se da invenção atual compreendem os copolymers preparados pelo copolymerization radical ao menos de um monomer ethylenic alkoxy -, aryloxy -, do alkylaryloxy- ou do arylalkyloxy-polyalkylene do glicol do urethane com ao menos o um monomer anionic e ao menos um monomer non-ionic, e opcionalmente, um acrylate alkoxy -, aryloxy -, do alkylaryloxy- ou do glicol do arylalkyloxy-polyalkylene ou um methacrylate ou um alkyloxy -, aryloxy -, ether do alkylaryloxy- ou do allyl do glicol do arylalkyloxy-polyalkylene, e/ou um agente crosslinking.
