Abstract:
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/100g.
Abstract:
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 µm or more and 60 µm or less, and in the gas diffusion electrode substrate, the pore volume of pores with a pore size of 0.1 µm or more and less than 10 µm 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 µm or more and less than 100 µm.
Abstract:
The present invention relates to an epoxy resin composition for fiber reinforced composite material comprising the following components (1) - (3) as essential components, their mixing ratios meeting the following conditions (I) - (IV), and component (3) being dissolved homogeneously: component (1): epoxy resin that is liquid at room temperature, component (2): aromatic polyamine that is liquid at room temperature, component (3): diaminodiphenylsulfone, condition (I): The proportion of component (1) relative to the entire epoxy resin in the composition is 60-100 wt%, condition (II): The sum of the proportions of components (2) and (3) relative to the entire polyamine in the composition is 70-100 wt%, condition (III): The proportion of component (3) relative to the entire polyamine in the composition is 25-60 wt%, and condition (IV): The stoichiometric ratio of the entire polyamine to the entire epoxy resin in the composition is 0.7-1.3. Another embodiment of the invention relates to an epoxy resin composition for fiber reinforced composite material that contains at least the following components (4) - (6), forms a cured product with a theoretical molecular weight between crosslinking points in the range of 250-350 g/mol, and has an initial viscosity at 80 DEG C of 1-500 MPa.s: (4): aromatic epoxy resin with tri- or higher functionality, (5): aromatic epoxy resin with di- or higher and lower than tri-functionality, and (6): aromatic polyamine, the molecular weight between crosslinking points being defined as the weight of the entire cured epoxy resin divided by the number of crosslinking points contained in the entire cured epoxy resin. The invention also relates to an epoxy resin composition for fiber reinforced composite material that consists of the following components (7) and (8): (7) a polyglycidyl ether of phenol aralkyl resin as represented by the following formula: where R , R , R and R denote a hydrogen atom, an alkyl group having 1-8 carbon atoms, or a halogen atom, and m and n denote an integer of 1-4 and a real number of 0 or more and less than 1, respectively, and (8) polyamine. With the constitution described above, the present invention can provide a liquid epoxy resin composition for low cost production of high performance fiber reinforced composite material, that has a low viscosity at relatively low temperatures, and that after being cured, the cured product is high in glass transition temperature, elastic modulus and toughness while being small in the glass temperature decrease caused by water absorption and also small in the coefficient of linear expansion; and can provide a method to produce fiber reinforced composite material therefrom. Fiber reinforced composite material produced according to the present invention can serve as material for parts of aircraft, including main wing, tail, rotor blade, fairing, cowl, and door; parts of spacecraft, including motor case and main wing; and parts of space satellite body structure. They can also be used preferably as material for automobile chassis and railroad vehicle body structure.
Abstract:
An epoxy resin composition for a fiber-reinforced composite material which comprises the following components (A), (B) and (C): an alicyclic epoxy resin, a polyamine, and a latent acid catalyst being soluble in the component (A) or the component (B). The epoxy resin composition has a low viscosity and accordingly can be suitably used as a material for the molding of a fiber-reinforced composite material, for example, RTM. A cured product obtained by heating the composition has excellent thermal resistance and strength, and thus can be suitably used in members of an aircraft, a spacecraft, an artificial satellite and the like.
Abstract:
PROBLEM TO BE SOLVED: To provide an epoxy resin composition using a tertiary amine as a curing agent in which the viscosity increase in the initial stage can be suppressed while maintaining the curing time, and to provide a method for producing an epoxy resin composition member in which the epoxy resin member can be produced efficiently by the casting using this composition. SOLUTION: The epoxy resin composition includes the components: (a) an epoxy resin, (b) a tertiary amine and (c) a cyclic ester, wherein the component (c) is added in an amount of 1-30 wt.% relative to 100 wt.% of (a) of the epoxy resin. COPYRIGHT: (C)2003,JPO
Abstract:
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.
Abstract:
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.
Abstract:
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 .
Abstract translation:本发明提供一种燃料电池气体扩散电极介质,具有优异的防淹特性和抗干燥特性,在低温至高温的宽温度范围内实现高电池性能的能力以及卓越的机械性能,导电性 和导热性,微孔层布置在电极基材的一个表面上; 其特征在于,所述燃料电池气体扩散电极介质的特征在于,所述微孔层中包含长径比为30〜5000的直线状碳,所述气体扩散电极介质的面积重量为30〜60g / m 2。
Abstract:
[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%.