摘要:
A functionality-latent polyolefin fiber that is capable of effectively exhibiting a predetermined function such as water repellency by heat treatment and has an oil agent and a function-imparting agent adhering to the surface thereof and that is to be heat-treated whereby the adherence amount of said oil agent is substantially decreased by penetration of said oil agent into the article and the function of the above function-imparting agent is exhibited.
摘要:
A process for the production of insulator-coated black particles, which comprises the steps of(1-a) dispersing particles of silica or a metal oxide in an alcohol-based solvent consisting mainly of an intermediate alcohol to obtain a dispersion of the above particles,(1-c) forming a titanium oxide coating of TiO.sub.2 on the surface of each of the particles whose surfaces have been activated in the above step, to obtain titanium oxide-coated particles,(1-d) calcining the titanium oxide-coated particles obtained in the above step in a reducing and/or nitriding atmosphere and thereby blackening the above titanium oxide coatings to obtain black particles, and(1-e) forming an electrical insulator coating on a surface of each of the black particles obtained in the above step, to obtain insulator-coated black particles; characterized in that the process includes a step of(1-b) adding an alkaline aqueous solution to the dispersion obtained in step (1-a) to activate a surface of each of the particles of a metal oxide.
摘要:
A porous fiber having sufficient chemical resistance to a variety of substances to be adsorbed, and having a large specific surface area and a large void percentage. The porous fiber provided by the present invention features a main fiber body formed of a high-density polyethylene having a melt flow rate of 0.3 to 20 g/10 minutes and numerous pores. The pores are formed by mixing the high-density polyethylene with a paraffin wax while they are melted, melt-spinning a fiber with an extruder at a draft ratio of 200 or less, stretching the fiber, heat-treating the stretched fiber, mechanically crimping it and then removing the paraffin wax. In the porous fiber, the main fiber body has a specific surface area of 20 m.sup.2 /g or more, the ratio of the pores to the main fiber body is 20% or more and the main fiber body has a size of not more than 50 denier.
摘要:
A twisted FRP structure having sufficient strength and flexibility is produced by providing a rod member disposed centrally and twist a plurality of side strands twisted around the rod member in the same direction at a predetermined pitch. At least the side strand includes a composite strand having an FRP element from by impregnating fibers with an uncured thermosetting resin and a thermoplastic coating on such FRP element, the thermosetting resin being cured after the side strands are twisted around the rod member. The twisting pitch is not less than 25 times the outside diameter of the FRP element in the side strand.
摘要:
Continuous rod-like molding having a FRP core and an outer skin of thermoplastic resin is shaped by introducing the molding into a passage of a heated die, the passage having a diameter slightly smaller at an exit thereof than an initial diameter of the molding, plasticizing the thermoplastic resin by passing the molding through the passage, thereby removing a part of the outer skin, and solidifying the thermoplastic resin, thereby obtaining a product having a diameter equal to the diameter of the exit of the passage.
摘要:
The rope of this invention comprises a plurality of strands each having a twisted reinforcing fiber bundle, thermosetting resin applied to the fiber bundle, and a thermoplastic resin cover enclosing the fiber bundle. Each strand in the rope is kept to substantially a round sectional shape by the twisted fiber bundle.The method for forming the rope comprises the steps of twisting the reinforcing fibers in such a manner that the tensile strength of the twisted fibers is not reduced to less than 50% of the fibers not twisted, applying an uncured thermosetting resin to the twisted fibers, covering the fibers with a molten thermoplastic resin, cooling the thermoplastic resin to cover the fibers with solidified thermoplastic resin and thereby forming a strand, forming a rope structure from a plurality of the strands, and heating the rope structure to cure the thermosetting resin applied on the fibers.