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Publication Date: 2016-Apr-19

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The Prior Art Database


An epoxy modified cement composition having (A) epoxy resin comprising at least one epoxy resin, (B) a curing agent comprising water and at least one amine compound selected from the group consisting of polyamine, polyamide, a polyamidoamine polyamine-polyepoxide adduct, polyamide-polyepoxide adduct, and a mixture of at least two of these compounds, and (C) a solid component comprising at least one hydraulic inorganic binder. The curing agent is at least one amine compound selected from the group consisting of a polyamine, polyamide, a polyamidoamine polyamine-polyepoxide adduct, polyamide-polyepoxide adduct or a mixture of at least two of these compounds. The amine compound contains compounds sufficiently contact reactable to epoxy resin and the solid component to form a solid article having a compressive strength greater than about 70 MPa.

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[0001]      The present disclosure relates to water-based curing agents and epoxy modified cement systems exhibiting a beneficial combination of properties including excellent compressive strength.

[0002]      Epoxies are known for their excellent adhesion, chemical and heat resistance, good-to-excellent mechanical properties, and good electrical insulating properties. Cured epoxy resin systems have found extensive applications ranging from coatings, adhesives, and composites. Specific examples include epoxy composites using carbon fiber and fiberglass reinforcements, protective coatings for metal surfaces, and construction products for concrete, cementitious or ceramic substrates, often referred to as civil engineering applications, such as formulations for concrete flooring.

[0003]      Cured epoxy resin systems consist of two components that may chemically react with each other to form a cured epoxy, which is a hard, duroplastic material. The first component is an epoxy resin and the second component is a curing agent, often referred to as a hardener. Epoxy resins are substances or mixtures which contain epoxide groups. The curing agents include compounds which are reactive to the epoxide groups of the epoxy resins, such as amines, carboxylic acid, and mercaptanes (H. Lee and K. Neville "Handbook of Epoxy Resins" McGraw Hill, New York, 1967, pages 5-1 to 5-24).  The epoxy resins may be cross-linked or cured by curing agents. The curing process is the chemical reaction of the epoxide groups in the epoxy resins and the reactive groups in the curing agents. The curing converts the epoxy resins, which have a relatively low molecular weight, into relatively high molecular weight materials by chemical addition of the curing agents to the epoxy resins. Additionally, the curing agent may contribute to many of the properties of the cured epoxy.

[0004]      For flooring systems, there are diverse requirements. Desired properties may be, for example, aesthetical appearance, mechanical strengths and chemical resistance, adhesion strength. There are other requirements, for example, good handling properties, solvent free and good smoothness. Current flooring materials include flooring materials that are organic or organic hybrid systems.

[0005]      It is difficult to combine the desired properties, some of which are contradictory in terms of their physical requirements, within a flooring coating system. When using solvent free epoxy resin coatings, for example, a freshly prepared concrete surface can generally not be coated, for example,  until after 28 days, since the residue moisture content of concrete must not exceed 5%. In t...