Toray Industries, Inc.

Toshiya Kamae

Masamichi Utsunomiya

Yasuaki Tanimura

Makoto Endo

Hiroki Oosedo

Daigo Kobayashi

Yoshifumi Nakayama

Go Tanaka

Kentaro Sano

Yasutaka Okano

Shinji Kouchi

Shigeo Iwasawa

Kenichi Yoshioka

Junko Kawasaki

Koji Furukawa

Ryuji Sawaoka

Takashi Chida

Masayuki Miyoshi

Shunsaku Noda

Toru Sugahara

Masaru Hashimoto

Ayumi Mori

Michio Wakatabe

Shinji Kochi

Katsuya Sode

Kazuyo Shigeta

Takashi Ando

Junichi Urai

Taiki Kuroda

Mariko Ishikawa

Soichi Yoshizaki

Hiroyuki Uchida

A prepreg having excellent tackiness as well as excellent resin strength after curing and strength in the non-fiber direction is described; and a fiber-reinforced composite material using the prepreg, where the prepreg is composed of reinforcing fibers and a resin composition which includes [A] an epoxy resin, [B] a dicyanamide and [C] a compound having a melting point of 130&#xb0; C. or lower and a solubility parameter whose difference from the solubility parameter of [B] is 8 or less.

Prepreg and fiber-reinforced composite material

The purpose of the present invention is to provide: a method for producing a gas diffusion electrode base which enables the achievement of a gas diffusion electrode base that has a microporous layer with small surface roughness and is not susceptible to damaging an electrolyte membrane; and a gas diffusion electrode base that has a microporous layer with small surface roughness and is not susceptible to damaging an electrolyte membrane. For the purpose of achieving the above-described purpose, the present invention has the configuration described below. Namely, a specific gas diffusion electrode base which has a carbon sheet and a microporous layer, and wherein the carbon sheet is porous and the DBP oil absorption of a carbon powder contained in the microporous layer is 70-155 ml/100 g.

Gas diffusion electrode substrate and method for producing gas diffusion electrode substrate

Provided is a fiber-reinforced composite material exhibiting high heat resistance and excellent appearance quality. is the composite material is based on an epoxy resin composition which contains constituents [A], [B], and [C] and satisfies conditions (i) and (ii):

Epoxy resin composition, prepreg, fiber-reinforced composite material, and method for producing same

A gas diffusion electrode in which a microporous layer is provided on at least one surface of a conductive porous substrate, wherein the areas obtained by dividing the cross section perpendicular to the plane of the microporous layer into three equal parts in the thickness direction are a first area, a second area, and a third area, with respect to the conductive porous substrate side, the fluorine strength of the third area being 0.8 to 1.2 times the fluorine strength of the second area.

Gas diffusion electrode and fuel cell

A porous carbon sheet includes a carbon fiber and a binding material, wherein when in a measured surface depth distribution, a ratio of an area of a portion having a depth of 20 &#x3bc;m or less in a measured area of one surface is a surface layer area ratio X, and a ratio of an area of a portion having a depth of 20 &#x3bc;m or less in a measured area of another surface is a surface layer area ratio Y, the surface layer area ratio X is larger than the surface layer area ratio Y, and a difference between the surface layer area ratios is 3% or more and 12% or less.

Carbon sheet, gas diffusion electrode substrate and fuel cell

A gas diffusion electrode substrate has an electrically conductive porous substrate and a microporous layer-on one side of the electrically conductive porous substrate. The microporous layer-includes a dense portion A and a dense portion B. The dense portion A is a region containing a fluorine resin and a carbonaceous powder having a primary particle size of 20 nm to 39 nm. The dense portion A has a thickness of 30% to 100% with respect to the thickness of the microporous layer-as 100% and a width of 10 &#x3bc;m to 200 &#x3bc;m. The dense portion B is a region containing a fluorine resin and a carbonaceous powder having a primary particle size of 40 nm to 70 nm.

Gas diffusion electrode base, laminate and fuel cell

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 with a thickness in the range of 10 &#x3bc;m or more and 60 &#x3bc;m or less, and in the gas diffusion electrode substrate, the pore volume of pores with a pore size of 0.1 &#x3bc;m or more and less than 10 &#x3bc;m is within the range of 0.9 times or more and 5 times or less of the pore volume of pores with a pore size of 10 &#x3bc;m or more and less than 100 &#x3bc;m.

Gas diffusion electrode substrate, and membrane electrode assembly and fuel cell equipped with same

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.

Epoxy resin composition, fiber-reinforced composite material, and method for producing the same

A gas diffusion electrode has a microporous layer on at least one surface of an electroconductive porous substrate. The microporous layer has a first microporous layer in contact with the electroconductive porous substrate, and a dense layer in contact with the first microporous layer. The thickness of the dense layer is at least 1 &#x3bc;m. The average number density B of pores having a pore diameter of 0.15-1 &#x3bc;m in the dense layer is at least 1.3A, where A is the average number density of pores having a pore diameter of 0.15-1 &#x3bc;m in the microporous layer disposed on at least one surface of the electroconductive porous substrate.

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.

Gas diffusion electrode substrate, and membrane electrode assembly and fuel cell provided therewith

A gas diffusion electrode substrate that is used in a fuel cell, wherein a microporous layer constituted by a carbon based filler and a fluororesin is formed on one surface of the electrode substrate, the sliding angle of water on the surface on the opposite side of the surface on which the microporous layer is formed is 30 degrees or less, and the through-plane gas permeation resistance is 15 to 190 mmAq.

Gas diffusion electrode substrate

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).

Carbon fiber forming raw material, formed material, and carbon fiber-reinforced composite material

A gas diffusion electrode medium is for a fuel cell, has a low in-plane gas permeability and favorable water drainage characteristics in addition to high conductivity, and is able to exhibit high cell performance across a wide temperature range from low temperatures to high temperatures. The gas diffusion electrode medium is characterized by a microporous region being disposed at least at one surface of an electrode substrate, and the microporous region containing flake graphite having an aspect ratio of 50-5000.

Gas diffusion electrode medium for fuel cell

A fuel cell gas diffusion electrode medium has 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/m2.

Disclosed is a method for producing a sizing agent-coated carbon fibers, wherein at least one kind of sizing agent that is selected from the group consisting of sizing agents (a), (b) and (c) is used for coating, in each of the sizing agents a bi- or higher functional epoxy compound (A1) and/or an epoxy compound (A2) being used as a component (A), and the epoxy compound (A2) having a mono- or higher functional epoxy group and at least one functional group that is selected from among a hydroxyl group, an amide group, an imide group, a urethane group, a urea group, a sulfonyl group and a sulfo group. The sizing agent is applied to carbon fibers and the resulting is subjected to a heat treatment within the temperature range of 160-260&#xb0; C. for 30-600 seconds.

Growing community of inventors

Ehime, Japan

Toshiya Kamae