| 摘要 |
PURPOSE:To make it possible to obtain a satisfactory molded part by a single process by a method wherein aromatic polyamide particles, which form porous particulate matters (flocs) by cohering a large number of microparticles, are compression-molded under the specified conditions. CONSTITUTION:In order to manufacture special aromatic polyamide particles by interfacial polymerization, the volumetric ratio of dispersion of precondensate to aqueous solution of sodium carbonate or the like is set to be 0.4-0.6 and the tip speed of the agitating blades in a reaction tank is made to be 10m/s or higher. The mean particle diameter of an aromatic polyamide microparticle lies within the range of 0.1-10mum. The mean particle diameter of a porous floc, which is formed by cohering the microparticles, lies within the range of 10-400mum. In addition, their surface areas respectively lie within the ranges of 1-20m<2>/g and of 3-10m<2>/g. The above-mentioned special aromatic polyamide particles are heated at a temperature of 200-400 deg.C and pressurized under a pressure of 100-1,000kg/cm<2> for a period of time of 20min-5hr. In case of the manufacture of a molded part, the impact resistance of which is required, it is proper to mold the molded part under the state that 3-30% by weight (with respect to the aromatic polyamide particle) of reinforcing fiber-like matter is mixed with the aromatic polyamide particles. |
