The present disclosure provides a curing agent comprising a polyetheramine, a tertiary amine and an alkanolamine. The curing agent may be combined with an epoxy resin to form a curable composition which is capable of being applied to a substrate and cured to form a cured article.

The present disclosure provides a curing agent comprising a polyetheramine, a tertiary amine and an alkanolamine. The curing agent may be combined with an epoxy resin to form a curable composition which is capable of being applied to a substrate and cured to form a cured article.

A two-component epoxy resin composition, made of: a resin component including: at least one epoxy resin that contains on average more than one epoxy group per molecule; up to 25 wt.-% of at least one epoxy-functional reactive diluent having one or two epoxy groups per molecule; and a hardener component including: between 40 and 80 wt.-% of at least one amino-functional hardener of formula (I),

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wherein n is an integer with a value of 2 or 3, R.sup.1 is a linear, cyclic or branched alkyl residue that optionally contains ether oxygen atoms and R.sup.2 is a methyl or ethyl group; between 10 and 30 wt.-% of at least one Lewis base having at least one tertiary amino group, amidine group, or guanidine group; and between 10 and 30 wt.-% of at least one carboxylic acid.

A filament article containing a curable composition is provided. The filament article has a first part containing an epoxy resin and a second part containing a polyamine having at least two secondary or primary amino groups. The first part is surrounded by a sheath and a second part surrounded by a sheath. Either 1) the first part surrounded by the sheath and the second part surrounded by the sheath are each a separate filament or 2) the first part surrounded by the sheath and the second part surrounded by the sheath combine to form a composite filament. The curable filament article can be used to form a cured composition having structural bonding performance.

Provided is a resin composition that exhibits satisfactory impregnability into reinforcing fibers, while having rapid curability, and that is suitable for fiber-reinforced composite materials producing molded articles having high heat resistance. A two-pack resin composition for fiber-reinforced composite materials is configured of a base material including an epoxy resin (A) and a (meth)acrylate compound (B) having three or more (meth)acryloyl groups in a molecule, and a curing agent including an amine compound (C) represented by the following general formula (1), a mass ratio of the base material to the curing agent being within the range of from 85:15 to 65:35, Wherein the epoxy resin (A) includes 75% by mass to 100% by mass of a bisphenol A epoxy resin; the base material has a viscosity of 10,000 mPa.Math.s or less; and the curing agent has a viscosity of 800 mPa.Math.s or less. X—(CH.sub.2NH.sub.2).sub.n (1) (In the formula, X represents an n-valent organic group having 1 to 16 carbon atom; and n represents 2 or 3).

The present invention relates to an epoxy resin system containing an epoxy resin and a mono-alkylated diamine. The epoxy resin system can further contain a second amine. The present invention also relates to a method for producing an epoxy resin system comprising combining an epoxy resin with a mono-alkylated diamine. The mono-alkylated diamines of this invention enhance desirable processing and cured properties of epoxy resin compositions without the negative impact on mechanical properties in the cured product normally seen with cycloaliphatic amine-based curing agents.

An ionic aqueous epoxy curing agent, a preparation method therefor and the use thereof. The aqueous epoxy curing agent is prepared by reacting the following raw materials in parts by weight: a) 1 part of a polyepoxy compound, b) 1.3-6 parts of a multifunctional compound, c) 0.2 to 1.25 parts of a monoepoxy compound, and d) 0.01 to 0.23 parts of a sultone, wherein the multifunctional compound has four or more active hydrogens. The curing agent obtained has a good hydrophilic effect and very good thinning performance, the paint film prepared by mixing same with an epoxy dispersion has the following advantages: excellent salt spray resistance and water resistance, strong adhesion, high hardness, etc.; in addition, the preparation process of the curing agent is simple, the conditions are mild, and room temperature curing is carried out.

The invention relates to a composition comprising an epoxy-derived covalent adaptable network, preferably an epoxy vitrimer comprising at least one unit of formula (I)

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The invention further relates to a method for preparing a composition comprising an epoxy-derived covalent adaptable network by contacting at least one amine comprising primary, at least one vinylogous precursor comprising vinylogous precursor groups and at least one epoxide comprising epoxide groups whereby the number of amine groups, the number of vinylogous precursor groups and the number of epoxide groups is controlled.

A curable epoxy resin adhesive including first and second amine curing agents each having a respective curing property determined by mixing the respective amine curing agent alone with a test epoxy resin to form a first or second curable mixture, and each curing property comprises a gel time when the curable mixture is at an ambient temperature of 25° C. and a peak exotherm temperature when the curable mixture is cured in air at a curing temperature of 70° C. A ratio between the first and second gel times is from 4-15:1 and the second amine curing agent has peak exotherm temperature is higher than the peak exotherm temperature of the first amine curing agent by a temperature Δt which is at least 2° C.

An epoxy resin composition with epoxy groups and active hydrogens having different molar equivalents includes an epoxy resin component and a curing agent component. A mixing ratio of the epoxy resin component and the curing agent component is a mixing ratio of a cured product with the highest glass transition temperature Tg among cured products with different mixing ratios measured experimentally. According to a weight percentage in a total weight of the epoxy resin component, the epoxy resin component includes: 50 wt % to 100 wt % of a bisphenol A epoxy resin. According to a weight percentage in a total weight of the curing agent component, the curing agent component includes: 60 wt % to 98 wt % of polyetheramine (PEA) and 2 wt % to 20 wt % of a low-viscosity Mannich base.