JPH0320338B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in tubular bodies such as fishing rods. Conventional tubular bodies such as fishing rods are constructed by winding and curing prepreg, which is made by impregnating a reinforcing fiber sheet made of glass fiber, carbon fiber, etc. with thermosetting synthetic resin. There is a defect in which the cracks that occur on the circumferential surface become larger, moisture, etc. enter into the cracks, and eventually cause delamination. The present invention prevents such defects in conventional fishing rods, etc. and improves their strength.The present invention is made by winding and curing prepreg impregnated with a thermosetting synthetic resin mixed with whiskers. This is a summary. To explain the embodiments of the present invention, a reinforcing fiber sheet 1 made of a woven fabric, an aligned sheet, or a nonwoven fabric made of long fibers such as glass fibers, carbon fibers, and boron fibers is coated with a thermosetting resin such as polyester resin or epoxy resin. 2 is impregnated to form a semi-dry prepreg 3, and when the prepreg is wound and heat-cured to form the tubular body 4 of the fishing rod, whiskers (whisker crystals) 5 are added to the thermosetting resin 2. It is a mixture. The whiskers include ceramic-based ones such as silicon carbide, boron carbide, sapphire, beryllia, etc., and metal-based ones such as copper, iron, and nickel, and their size is 0.1 to 1.0 μ in diameter and length. 50
Use something about ~200μ. The mixing amount of these whiskers 5 with respect to the thermosetting resin 2 is 5 to 30% by volume, preferably especially
Approximately 20% is suitable. However, the term "prepreg 3 mixed with whiskers" in the present invention refers not only to all prepregs constituting tubular bodies such as fishing rods, but also to some prepregs. The tubular body may be constructed of a single sheet of prepreg 3 made by impregnating a reinforcing fiber sheet made of woven fabric with a thermosetting synthetic resin mixed with whiskers, or the reinforcing material may be made of a fiber-aligned sheet as shown in Figure 2 (b). The tubular body can also be constructed by polymerizing prepreg 3', which is simply a fiber sheet impregnated with a thermosetting synthetic resin, and prepreg 3 of the same shape or small size, which is made by impregnating a scrim sheet with a thermosetting resin mixed with whiskers. Furthermore, the heat curing treatment is no different from conventional methods. In the present invention, whiskers are mixed into the thermosetting synthetic resin constituting the prepreg as described above, so that the bending strength, bending elasticity, and crushing strength of tubular bodies such as fishing rods can be enhanced, and the surface hardness is increased, resulting in wear resistance and It is possible to improve the impact resistance and reliably prevent the occurrence of cracks as in the conventional case, and furthermore, the condition of the fishing rod can be arbitrarily adjusted by adjusting the amount of whiskers mixed. Next, we compared the strength of the present invention, in which 20% of silicon carbide whiskers were mixed with a tubular body (10.0 mm size 5, impregnated synthetic resin, epoxy resin) using glass fiber and carbon fiber as reinforcing fibers, and the conventional one without mixing. The results of the experiment (2-point support, 2-point load, 4-point bending test, span 500mm, head lowering speed 25mm/Sec) are shown in the table below. 【table】

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the present invention, and FIGS. 2A and 2B are plan views of the prepreg of the present invention. 1... Reinforced fiber sheet, 2... Thermosetting resin,
3... prepreg, 4... tubular body, 5... whisker.

Claims (1)

[Claims] 1. A tubular body such as a fishing rod formed by winding and curing prepreg impregnated with a thermosetting synthetic resin mixed with whiskers.