The purpose of the present invention is to provide: an epoxy resin composition having both excellent dispersibility of a solid curing agent and excellent impregnation of reinforcing fibers; a molding material for the fiber-reinforced composite material that has excellent dispersibility of the solid curing agent in the post-thickened resin; and a fiber-reinforced composite material that has excellent appearance quality and mechanical characteristics and little unevenness in physical properties. In order to achieve the aforementioned purpose, this epoxy resin composition has the following configuration. The epoxy resin composition includes all components (A)-(C). The degree of dispersion of component (B) in component (A) is 0.1-0.8, the viscosity at 25° C. is 0.1-100 Pa.Math.s, and the glass transition temperature of an epoxy resin cured product at any hardness between 85%-95% is at least 110° C. Component (A): An epoxy resin having at least two epoxy groups in each molecule Component (B): A solid curing agent Component (C): A dispersant miscible with component (A)

A first composition is disclosed that includes a fire-resistant thermoplastic resin. The fire-resistant thermoplastic resin includes 1-20 wt % of an aryl phosphate, includes 1-20 wt % of a phosphate polymer, and 60%-98% of a (meth)acrylic polymer, including units from at least one monomer, wherein the monomer is chosen from methyl methacrylate, acrylic acid, methacrylic acid, acrylic acid esters, methacrylic acid esters, acrylonitrile and maleic anhydride. The first composition may further include a fabric or a composite material that is embedded with the fire-resistant thermoplastic resin. In some instances, the aryl-phosphate and the phosphonate polymer synergistically reduce an effective heat of combustion, a peak heat release, or a flame time as compared to a second composition that contains only one of the aryl phosphate or the phosphonate polymer.

This utility invention is to replace some of the parts of current vehicles and robotic machines with intelligent graphene-based fibers and nanocomposites to achieve significantly weight-decreasing and energy-savings. This invention also is related to the formation of new generation vehicles, machine parts including robotics, which include but not limited to all kinds of cars, trailers, trucks, vehicles on roads and in the sky, ships on the ocean, and intelligent robotics for Human, as well as computer parts, bicycles, and sports supplies.

Pre-impregnated composite material (prepreg) that can be cured/molded to form aerospace composite parts. The prepreg includes carbon reinforcing fibers and an uncured resin matrix. The resin matrix includes an epoxy resin component, polyethersulfone as a toughening agent, a thermoplastic particle component, a nanoparticle component and a curing agent.

A process for producing a carbon sheet molding compound (SMC). An SMC manufacturing line including at least one conveyor line for laying up SMC resins on a carrier film is provided. A chopped carbon fiber which is evenly distributed using dehumidified supply air and using a pressurized air venturi apparatus which is used to debundle and randomize the carbon fibers, onto the resin on the carrier film as the carrier film moves along the conveyor.

The use of a composition including a mixture of at least one non-reactive thermoplastic polymer of Tg >40° C., especially >100° C., in particular >120° C., and at least one reactive thermoplastic prepolymer, with a fibrous material, for the preparation of a fibrous material impregnated with the composition, the composition having an initial melt viscosity during the impregnation, as measured in plate-plate rheology under 1 Hz and 2% strain, at a temperature of 300° C., of less than the viscosity of the same composition devoid of reactive prepolymer, measured under the same conditions, and/or a ductility, after in situ polymerization of the reactive thermoplastic prepolymer in the composition during the impregnation and after the impregnation, that is at least equivalent to the ductility of the same composition devoid of non-reactive thermoplastic polymer, and of which said reactive thermoplastic prepolymer is polymerized to the same number-average molecular mass (Mn).

A reinforcing-fiber composite material includes not less than 20 wt % but less than 70 wt % of discontinuous reinforcing fibers, and a matrix resin, wherein at least a portion of the discontinuous reinforcing fibers forms a fiber aggregation, and at least one bundle of the fiber aggregation has a surface that, when projected onto a two-dimensional plane, has at least one region where the number of monofilaments constituting the aggregation is reduced, at opposite ends in a longitudinal direction of a minimum circumscribed rectangle of the projected surface, and at portions other than the opposite ends.

Provided is a prepeg resin composition, containing: a urethane (meth)acrylate (A) that is a reaction product of polyisocyanate (a1), polyol (a2), and hydroxy alkyl (meth)acrylate (a3); and a polymerization initiator (B), as an essential component, in which the polyisocyanate (a1) is at least one polyisocyanate selected from 2,4′-diphenyl methane diisocyanate, 4,4′-diphenyl methane diisocyanate, a carbodiimide modified product of 4,4′-diphenyl methane diisocyanate, and polymethylene polyphenyl polyisocyanate, and the polyol (a2) has an aromatic-ring and an oxyalkylene structure. The prepreg resin composition of the invention is excellent in workability and molding properties, and is capable of forming a molded article excellent in various physical properties such as external appearance and heat resistance, and thus, can be preferably used in a prepreg and a molded article thereof.

The present disclosure relates to a CFRP structural body having improved flame retardancy, and a carbon fiber prepreg capable of giving a CFRP structural body having improved flame retardancy.

A CFRP structural body comprising CFRP, in which the CFRP structural body is molded from a carbon fiber prepreg comprising a carbon fiber mat formed of chopped carbon fiber bundles with a filament count of 3K or less impregnated with a resin composition, a carbon fiber content of the CFRP is 60% by mass or more, and the CFRP structural body does not have a portion with a thickness of less than 4 mm; and a prepreg comprising a carbon fiber mat impregnated with a resin composition, in which the carbon fiber mat is formed of chopped carbon fiber bundles with filament counts of 3K or less, and a carbon fiber content of the prepreg is 60% by mass or more.

An object of the present invention is to provide a fiber-reinforced thermoplastic resin sheet which can be manufactured into a molded body exhibiting excellent appearance quality as well as exhibits both high moldability and strength and a manufacturing method of such a fiber-reinforced thermoplastic resin sheet. The present invention relates to a fiber-reinforced thermoplastic resin sheet which is a random laminated body of a tape-shaped unidirectional prepreg and contains spread reinforcement fibers and a polymer (a) and in which the polymer (a) is a polymer of at least a bisphenol A type epoxy compound represented by Formula (1): ##STR00001##
where n is an integer of 1 to 4
and a bisphenol compound selected from the group consisting of bisphenol A, bisphenol F, bisphenol S, bisphenol B, bisphenol E, and bisphenol P.