摘要:
Provided is a fiber-reinforced composite material exhibiting high heat resistance and excellent appearance quality. It is an epoxy resin composition which contains constituents [A], [B], and [C] and satisfies conditions (i) and (ii): [A] a tri- or higher functional epoxy resin [B] an aromatic amine [C] an imidazole compound (i) 0.20 ≤ b/a ≤ 0.60 (ii) 0.002 ≤ c/a ≤ 0.014 (where, a (mol) denotes the number of epoxy groups in 100 g of entire of the epoxy resin composition, b (mol) denotes the number of active hydrogen contained in the constituent [B], and c (mol) denotes the number of imidazole rings contained in the constituent [C]).
摘要:
Disclosed herein are an epoxy resin composition for fiber-reinforced composite materials which has low viscosity, high Tg, high elastic modulus, and excellent fracture toughness and a fiber-reinforced composite material using such an epoxy resin composition which has excellent thermal properties, compressive strength, impact resistance, fatigue resistance, and open-hole tensile strength and which is suitable for producing structural parts of aircraft and the like. The epoxy resin composition comprises at least a given bifunctional epoxy resin as a component (A), a liquid aromatic diamine curing agent as a component (B), and core-shell polymer particles as a component (C), wherein the core-shell polymer particles as the component (C) contain epoxy groups in their shell and have a volume-average particle size of 50 to 300 nm.
摘要:
A gas diffusion electrode substrate that is used in a fuel cell and is constituted by an electrode substrate and microporous parts, in which a microporous part (A) is formed on one surface of the electrode substrate, and a microporous part (B) is formed in a part of the inside of the electrode substrate, the gas diffusion electrode substrate having a part in which the microporous part (B) is continuously present from the electrode substrate surface on the side on which the microporous part (A) is formed to a position near the electrode substrate surface on the opposite side, and a part in which pores are continuously distributed from the electrode substrate surface on the side on which the microporous part (A) is formed to the electrode substrate surface on the opposite side.
摘要:
The present invention provides a fuel cell gas diffusion electrode medium having exceptional anti-flooding characteristic and anti-dry-out characteristic, the capability to achieve high cell performance across a wide temperature range from low to high temperatures, and exceptional mechanical properties, electrical conductivity, and thermal conductivity, a microporous layer being arranged on one surface of an electrode base material; wherein the fuel cell gas diffusion electrode medium is characterized in that linear carbon having an aspect ratio of 30-5000 is included in the microporous layer, and the areal weight of the gas diffusion electrode medium is 30-60 g/m 2 .
摘要:
[Problem] The present invention provides a gas diffusion medium for a fuel cell, which has low in-plane air permeability and good drainage property and is capable of exerting high cell performance across a wide temperature range from low to high temperatures. [Means for Solution] The gas diffusion medium for a fuel cell is characterized by comprising a microporous region [A], an electrode base material and a microporous region [B] that are arranged in the order mentioned, wherein the microporous region [A] has an areal ratio in the range of 5 to 70% and the microporous region [B] has an areal ratio in the range of 80 to 100%.
摘要:
The present invention provides a fuel cell gas diffusion electrode medium having exceptional anti-flooding characteristic and anti-dry-out characteristic, the capability to achieve high cell performance across a wide temperature range from low to high temperatures, and exceptional mechanical properties, electrical conductivity, and thermal conductivity, a microporous layer being arranged on one surface of an electrode base material; wherein the fuel cell gas diffusion electrode medium is characterized in that linear carbon having an aspect ratio of 30-5000 is included in the microporous layer, and the areal weight of the gas diffusion electrode medium is 30-60 g/m 2 .
摘要:
Provided is a carbon fiber forming raw material having excellent interfacial adhesion between carbon fibers and a thermosetting resin and capable of giving a molded article having excellent mechanical characteristics. The carbon fiber forming raw material is a carbon fiber forming raw material (Z) as a prepreg including sizing agent-coated carbon fibers and a thermosetting resin or a carbon fiber forming raw material (Y) as a forming material that includes sizing agent-coated carbon fibers and has a woven fabric form or a braid form. The sizing agent includes components (A) and (B). The component (A) is an epoxy compound having two or more epoxy groups or two or more types of functional groups. The component (B) is one or more compounds selected from the group consisting of a tertiary amine compound, a tertiary amine salt, a quaternary ammonium salt, a quaternary phosphonium salt, and a phosphine compound. The component (B) is contained in an amount of 0.1 to 25 parts by mass relative to 100 parts by mass of the component (A).
摘要:
Disclosed herein are an epoxy resin composition for fiber-reinforced composite materials which has low viscosity, high Tg, high elastic modulus, and excellent fracture toughness and a fiber-reinforced composite material using such an epoxy resin composition which has excellent thermal properties, compressive strength, impact resistance, fatigue resistance, and open-hole tensile strength and which is suitable for producing structural parts of aircraft and the like. The epoxy resin composition comprises at least a given bifunctional epoxy resin as a component (A), a liquid aromatic diamine curing agent as a component (B), and core-shell polymer particles as a component (C), wherein the core-shell polymer particles as the component (C) contain epoxy groups in their shell and have a volume-average particle size of 50 to 300 nm.
摘要:
The invention relates to (I) an epoxy resin composition for fiber-reinforced composite material which comprises as the essential components (1) an epoxy resin liquid at room temperature, (2) an aromatic polyamine liquid at room temperature, and (3) diaminodiphenyl sulfone; (II) an epoxy resin composition for fiber-reinforced composite material which comprises at least (4) an at least trifunctional aromatic epoxy resin, (5) an aromatic epoxy resin having a number of epoxy groups of 2 or above but below 3, and (6) an aromatic polyamine, gives a cured resin having a theoretical molecular weight between crosslinks of 250 to 350 g/mol, and exhibits an initial viscosity of 1 to 500 mPa/s at 80 °C; and (III) an epoxy resin composition for fiber-reinforced composite material which comprises (7) a polyglycidyl ether of a phenol-aralkyl resin and (8) a polyamine. The invention provides liquid epoxy resin compositions which exhibit low viscosities at relatively low temperatures and give cured resins having excellent performances such as little drop by water absorption in glass transition temperature.