摘要:
A prepreg base material which comprises many reinforcing fibers arranged in one direction and a matrix resin present among the many reinforcing fibers. The prepreg base material has, throughout the whole surface, many incisions each extending in a direction crossing the reinforcing fibers, substantially all of the reinforcing fibers having been divided by one or more of the incisions. The reinforcing fiber segments formed by division by the incisions have a length (L) of 10-100 mm. The prepreg base material has a thickness (H) of 30-300 µm, and the content by volume (Vf) of the reinforcing fibers in the prepreg base material is 45-65%.
摘要:
The invention provides epoxy resin composition containing, as epoxy resin, the following epoxy resin (a) and epoxy resin (b), solid rubber at a ratio of 1 to 20 parts by weight to 100 parts by weight of the entire epoxy resins, and an aromatic amine as a curing agent and having a glass transition temperature of 160 to 220°C in form of a cured material after heat curing at 180°C for 2 hours: (a) an epoxy resin having oxazolidone rings and (b) a glycidylamine type epoxy resin.
摘要:
Disclosed is a process for producing a sheet-shaped prepreg which comprises: a fiber bundle introduction step in which tape-like reinforcing fiber bundles are disposed in a multilayer arrangement in the thickness direction and introduced into a die to which a molten thermoplastic resin has been supplied; a fiber bundle thickness reduction step in which each of the tape-like reinforcing fiber bundles is widened by means of spreading to reduce the thickness; a resin impregnation step in which the tape-like reinforcing fiber bundles are impregnated with the molten resin in the die; and a lamination step in which the plurality of resin-impregnated tape-like reinforcing fiber bundles are laminated in the die. Also disclosed is an apparatus for producing the sheet-shaped prepreg. It is possible to produce a high-grade sheet-shaped thermoplastic prepreg in which the resin has been uniformly and satisfactorily impregnated throughout and the reinforcing fibers have been uniformly arranged. Furthermore, the time required for resin impregnation can be considerably shortened and the productivity can be remarkably enhanced.
摘要:
The present invention has an object of providing a method for producing a carbon fiber woven fabric in which the length of each warp yarn made of a carbon fiber strand is uniform, weft yarns are straightly arranged without waviness, and that is excellent in quality can be obtained with high productivity (production speed), and is characterized that a method for producing a carbon fiber woven fabric using an air jet loom in which heald in a shedding motion has an angle of repose in a range of 0 to 50° when weaving a uni-directional carbon fiber woven fabric woven with a carbon fiber strand having a fineness of 400 to 6, 000 tex as the warp yarn and an auxiliary fiber having a fineness of 1/5 or less of the carbon fiber strand as the weft yarn.
摘要:
A preform, formed with a plurality of reinforcing fiber substrates stacked to each other and each made of at least reinforcing fiber yarns, has a resin material, whose main component is a thermoplastic resin, interlaminated between the layers of the reinforcing fiber substrates in the preform, and has through holes extending through a plurality of the reinforcing fiber substrates in the thickness direction of the preform; an FRP molded using this preform; and processes for producing these. By improving the impregnability in the thickness direction of the preform, an FRP excellent both in various mechanical properties and in matrix resin impregnation and stabler in quality can be produced with high productivity.
摘要:
The present invention relates to a method for manufacturing a large FRP member and has the following structure. The method for manufacturing a large FRP member, comprising the following steps (A) to (F). They are:
setting step (A) of disposing a preform containing a reinforcing fiber base material on a surface of a molding die; sealing step (B) of covering a molding portion with a bagging material or a mold and providing at least one suction port and at least one resin injection port for sealing; evacuating step (C) of evacuating the molding portion through the suction port; hot-air heating step (D) of heating the molding portion by hot air; resin injection step (E) of injecting a thermosetting resin from the resin injection port for impregnating the reinforcing fiber base material with the resin while a temperature Tm of the molding die and a temperature Tv of the bagging material or the mold are both set to room temperature or more, and a difference ΔT in temperature between the Tm and the Tv is set to 10°C or less; and curing step (F) of curing the resin by maintaining the molding portion at a predetermined temperature Tpc which is equal to or more than room temperature.
Preferably, the preform described above includes the reinforcing fiber base material and a resin distribution medium. In addition, it is preferable that in the hot-air heating step (D), the molding die be placed in a sealed chamber which is heat insulated with a heat insulating material, the hot air be circulated and supplied, and timing of starting the injection of the resin from a plurality of the resin injection ports be controlled in accordance with signals supplied from resin detection sensors provided in the molding die. The present invention provides a method for manufacturing a large FRP member having superior quality at an inexpensive cost and with high production yield, in which non-impregnated portions and voids are unlikely to be formed.
摘要:
A fuel cell gas diffusion layer comprising a porous carbon fiber base substrate containing discontinuous carbon fibers bonded to each other with carbide and a porous layer containing at least carbonaceous particles, the porous carbon fiber base substrate having a porous layer (A) with a mean thickness t1 of 10 to 55 µm deposited on one surface, namely surface A, thereof, the porous carbon fiber base substrate being impregnated with porous layer (J) at least part of which is exposed at the opposite surface, namely surface B, the porous carbon fiber base substrate holding internal pores having a through-thickness cross-section area accounting for 5% to 40%, at least porous layer (A) and porous layer (J) both having a percentage of void of 50% to 85%, the porous carbon fiber base substrate having a thickness of 60 to 300 µm, and the porous carbon fiber base substrate having a bulk density of 0.20 to 0.45 g/cm 3 .
摘要翻译:一种燃料电池气体扩散层,包括含有碳化物彼此结合的不连续碳纤维的多孔碳纤维基材基材和至少含有碳质粒子的多孔层,多孔碳纤维基材基材具有多孔层(A),平均厚度 在一个表面(即其表面A)上沉积10至55μm的t1,多孔碳纤维基材浸渍有多孔层(J),其中至少一部分在相对表面即表面B,多孔碳 保持具有5%至40%的贯穿厚度横截面积的内孔的纤维基底基材,至少具有50%至85%的空隙百分比的多孔层(A)和多孔层(J), 多孔碳纤维基材,其厚度为60〜300μm,多孔碳纤维基材的体积密度为0.20〜0.45g / cm 3。
摘要:
This invention provides a chopped fiber bundle comprising a large number of unidirectionally arranged reinforced fibers. The length of each of the reinforced fibers is in the range of 5 to 100 mm. The chopped fiber bundle has a transition segment in which the number of the reinforced fibers increases toward the central part of the chopped fiber bundle in the aligned direction of the reinforced fibers with both ends in the aligned of the reinforced fibers in the chopped fiber bundle being a starting point. The level of a change in total sectional area of the large number of reinforced fibers is not more than 0.05 mm 2 per mm in the aligned direction of the reinforced fibers over the whole area in the longitudinal direction of the chopped fiber bundle.