JPS596213B2 - Manufacturing method of fiber-reinforced rod-shaped body - Google Patents

Description

[Detailed description of the invention] The present invention is a method for producing fiber-reinforced rods of excellent quality.

Conventionally, in order to manufacture a fiber-reinforced rod-shaped body, a reinforcing fiber base material is impregnated with a binder such as phenol resin, unsaturated polyester, or epoxy resin, and after wrapping it around a core metal etc., generally using cellophane tape, A method is employed in which the surface is coated, heated and cured to the curing temperature of the binder, and after cooling, the cellophane tape is removed to obtain an appropriate size and shape.

However, since these fiber-reinforced rod-like bodies use a binder, the cellophane tape and binder used adhere tightly and become integrated with the rod-like body when heated and cured, making it difficult to remove and requiring a lot of effort. I had to put in the effort.

Furthermore, because the rods are removed mechanically using metal wires, paras, and knives, the rods are easily damaged, and the yield of good products decreases in inverse proportion to the speed of the removal process. It also accounts for a large proportion of the cost structure of the entire rod-shaped body, and is one of the major causes of cost increases. The present invention aims to solve these drawbacks, and by coating the surface of a fiber-reinforced rod-shaped body in an uncured state with a polyvinyl alcohol (hereinafter referred to as PVA) film and curing it, The cured PVA film can be easily removed by simply treating it with hot water, and does not require a lot of effort and time to remove unlike the case where it is covered with cellophane tape. The purpose of this invention is to provide a method for manufacturing a fiber-reinforced rod-shaped body that prevents damage and has excellent quality.

That is, the present invention provides a method for manufacturing a fiber-reinforced rod-shaped body using carbon fiber, glass fiber, aromatic polyamide fiber, boron fiber, silicon carbide fiber, and other fiber products as a base material, and impregnating the base material with a thermosetting resin as a binder. In,
The average degree of polymerization is 1 on the surface of the rod-shaped body in which the binder is in an uncured state.
00 卜2000) A method for producing a fiber-reinforced rod-shaped body, which is characterized in that it is coated with a film made of polyvinyl alcohol with a degree of saponification of 80 mol% or more, cured by heating, and then treated with hot water to dissolve and peel it off. . In the method of the present invention, the term "fiber-reinforced rod-shaped body" refers to one that has a rod-like appearance, and includes, for example, a rod-shaped body, a tubular body, a bamboo-shaped body, etc., but is not particularly limited.

Hereinafter, the present invention will be explained in more detail, and an example will be explained in which a fishing rod made of fiber-reinforced resin is manufactured.

Carbon fiber, glass fiber, aromatic polyamide fiber, boron fiber, silicon carbide fiber, and other fiber products are used as the reinforcing fiber base material. Glass fiber fabric is mainly used, but the elastic modulus can be adjusted as necessary. In some cases, high-strength carbon fiber fabrics are used.

Further, as the binder, a thermosetting resin such as a thermosetting phenolic resin, an unsaturated polyester resin, or an epoxy resin is used. Normally, these reinforcing fiber base materials are impregnated with a binder in advance, and the impregnated binder is then slightly heated and dried to become a semi-cured state (so-called prepreg) that is easy to wrap around the core metal. There is.

This semi-cured base material is cut into a fan shape of a predetermined width so that the number of laminated layers is sufficient to achieve the required strength, and this is wound around a core metal. Then, cover the surface with PVA film,
Holds shape and applies pressure. The PVA film in this case may be in the form of a tape or a sheet, but the tape form is better if possible. At this time, since a certain pressure is required depending on the type of binder, it is adjusted by changing the wrap ratio of the tape. Thereafter, it is charged into a heating furnace together with the core metal, and heated to a temperature suitable for curing the binder, about 120 to 160°C, to be cured. After cooling, pull out the core metal and immerse it in hot water.
Dissolve and remove the PVA film tape. Dissolution and removal here does not only mean complete dissolution, but also includes partial dissolution.After washing with water and drying, the tape traces are polished and a paint finish is applied to produce the final product. Further, other golf shafts and the like can also be manufactured by substantially the same means as described above. The PVA film tape used in the present invention has an average polymerization degree of 1
000-20001 Saponification degree 80 mole? The above-mentioned PVA is made into a film without using a plasticizer other than water so that the stretching ratio is about 1 to 5 times, and it is preferable that the film has a small elongation. Particularly, the advantage of using PVA film is that, as mentioned above, PV
After coating a rod-shaped body with A film and curing it, the coating is dissolved and removed by hot water treatment, or PV
Various methods are possible, such as swelling A with hot water or the like and peeling it off manually, but either way, peeling is easy.

PVA film uses epoxy resin as a binder and is not difficult to peel off like when covered with cellophane tape, and when phenol resin is used as a binder, water is generated during curing or PVA film When coated and heat cured, water evaporates easily from the PVA film, resulting in a product of excellent quality. As explained above, the present invention is characterized in that when producing a fiber-reinforced rod-shaped body, a PVA film is coated on the surface of the fiber-reinforced rod-shaped body while the binder is in an uncured state. According to the present invention, If the PVA film used during manufacturing generates water from the hardening agent at high temperatures, water can pass through it, and there is no chemical reaction with the binder, and after hardening, PVA can be easily treated with hot water.
This has the effect that the VA film can be peeled off.

The present invention will be further explained below with reference to Examples.

Example A carbon fiber cloth impregnated with phenolic resin was wrapped around an iron core to form an 8-layer rod-shaped body.

A PVA film tape with an average degree of polymerization of 1200 and a degree of saponification of 95 mol% and a stretching ratio of 2.5 times that does not contain a plasticizer was then wrapped around the rod-shaped body and held in a heat treatment furnace at a temperature of about 150°C for 1 hour to harden it. Ta. After cooling, it was immersed in warm water at a temperature of 60°C, and could be easily peeled off. The surface of this rod-shaped body was polished by shot blasting, and its quality was examined. As a result, it had a good appearance and its physical properties were superior to those obtained by conventional methods.

Claims (1)

[Claims] 1. In a method for manufacturing fiber-reinforced rods that uses carbon fibers, glass fibers, aromatic polyamide fibers, boron fibers, silicon carbide fibers, and other fiber products as base materials and impregnates them with a thermosetting resin as a binder, the binder An average degree of polymerization of 1000 to 200 is applied to the surface of the rod-shaped body in an uncured state.
0. A method for producing a fiber-reinforced rod-shaped body, which comprises coating a film made of polyvinyl alcohol with a degree of saponification of 80 mol% or more, curing it by heating, and then dissolving and peeling it off by treating it with hot water.