JPS6158295B2 - - Google Patents

Description

[Detailed description of the invention]

Modern fishing rods are made by wrapping a prepreg sheet, which is made by impregnating a reinforcing fiber sheet such as glass fiber or carbon fiber with a thermosetting resin such as unsaturated polyester resin, around a core bar, and then wrapping cellophane tape on top of the prepreg sheet. Currently, the manufacturing process is to heat-treat, harden, and then pull out the core metal.However, heat treatment and hardening take a long time, resulting in extremely low manufacturing efficiency.Temperature control is also troublesome, requires skill, and requires long periods of high temperature. There was a defect in which the core metal and the wrapping material sometimes bent due to processing over time. It is also known that as photo-curing paints, paints made of resins such as unsaturated polyester resins having radically polymerizable unsaturated groups in their molecules, vinyl monomers, and photosensitizers can be cured with ultraviolet light in a short time. , the photocuring method for this paint has a normal film thickness.
It is only about 100μ thick and usually has a wall thickness similar to that of a fishing rod.
If the diameter is around 1000μ, or even more in some cases, it is not uncommon to see a rise in the furnace temperature, which will harden only the area near the surface, resulting in poor hardening of the inside, and furthermore, the bending strength and deflection of fishing rods will decrease. At the same time, since the vinyl monomer normally used is a styrene monomer, the curing reaction proceeds even at room temperature, resulting in manufacturing defects that shorten the shelf life of the prepreg for manufacturing fishing rods. In view of these current circumstances, the present invention improves the varnish for prepreg and cures it using heat and ultraviolet rays in combination to improve the above-mentioned defects. A reinforcing fiber sheet is impregnated with a composition obtained by dissolving a photosensitizer, an organic peroxide, and cobalt naphthenate in a mixed solvent with a low boiling point and a medium boiling point to create a prepreg sheet, and the prepreg sheet is used as a core metal. The gist of this method is to wrap the tape around the core, wrap the tape around the top, perform a curing process using a combination of heating to about 160°C and irradiation with ultraviolet light, and then pull out the core. The method of the present invention uses a varnish for prepregs in which an unsaturated polyester resin, diallyl phthalate monomer, photosensitizer, organic peroxide, and cobalt naphthenate are dissolved in a mixed solvent of medium and low boiling points, and the curing treatment is not performed. Since this method uses a combination of photo-curing action and thermo-curing action using ultraviolet rays, the prepreg material wound around the core metal has an inner layer,
The outer layer hardens uniformly in a short time, significantly shortening the hardening process for fishing rods and improving manufacturing efficiency. Furthermore, in the present invention, even if the surface temperature of the prepreg material rises during the curing process, the organic peroxide and cobalt naphthenate accelerate the curing of the inside of the material, causing the resin inside to flow out to the outside, resulting in the so-called ``Zaku'' phenomenon. Therefore, a homogeneous fishing rod can be manufactured without deterioration in bending strength or deflection. Furthermore, since the curing time of the present invention is short, even if the surface temperature is high, the core metal or material does not bend during manufacturing and produce defective products unlike in the past, and high-quality fishing rods can be efficiently manufactured. To explain the method of the present invention in detail, an organic peroxide such as t-butyl perbenzoate and cobalt naphthenate are added to an unsaturated polyester resin, a photosensitizer, and a diallyl phthalate monomer, and this is mixed with acetone methyl ethyl ketone, ethyl acetate, etc. Prepreg varnish diluted with a mixed solvent consisting of low-boiling point solvents such as ketones and esters, which have a relatively high evaporation rate, and medium-boiling point solvents such as toluene and methyl isobutyl ketone, is applied to a transparent woven fabric such as glass fiber or aligned fibers. A prepreg sheet is prepared by impregnating a reinforcing fiber sheet, which is cut into a predetermined shape and wrapped in one to several braids around a core metal. Next, a shrinkable tape is wrapped around this surface and tightened, and then placed in an ultraviolet ray irradiation oven such as a mercury lamp for curing treatment.Furthermore, the core bar is removed and the tape is peeled off to produce a fishing rod. However, as the photosensitizer, benzoin ethyl ether, benzoin isopropyl ether, benzophenone, etc. are used, and organic peroxides are used because they affect the performance of the ultraviolet irradiation furnace, especially the internal temperature. If the temperature rise due to ultraviolet irradiation is about 160°C, it is preferable to use t-butyl perbenzoate in combination with cobalt naphthenate, which is a heat curing accelerator. be. The UV irradiation time, that is, the curing time, depends on the thickness of the fishing rod, the irradiation distance, the wattage of the mercury lamp, etc.
When using a 30W/cm mercury lamp and an irradiation distance of about 150mm, curing will be completed in about 10 minutes. Example A satin woven glass fiber cloth with a thickness of 0.21 mm was impregnated with a prepreg varnish having the composition shown in the table below at a weight ratio of 7 parts glass fiber cloth and 3 parts prepreg varnish, and this was impregnated with a central outer diameter of 11.48 mm. ,
A core metal with a taper of 0.48/1000 and a length of 100 mm is coated with 6 brazes at a length of 800 mm from the tip, and a tape is wrapped around the surface.The irradiation distance is 150 mm using two 30 W/cm mercury lamps. Material heating temperature 160℃ irradiation time 10 minutes curing treatment (However, material 3
The following table shows a comparison of the mechanical properties of the fishing rods obtained by subjecting the fishing rods to heat curing treatment at 170°C for 2 hours, then pulling out the core metal and removing the tape.

【table】

【table】

Claims (1)

[Claims] 1. A reinforcing fiber made of a composition obtained by dissolving an unsaturated polyester resin, a diallyl phthalate monomer, a photosensitizer, an organic peroxide, and cobalt naphthenate in a mixed container with a low boiling point and a medium boiling point. A prepreg sheet is created by impregnating the sheet, and the prepreg sheet is wrapped around a core metal, a tape is wrapped around the top of the prepreg sheet, and then a curing process is performed by heating to about 160℃ and UV irradiation. A method of manufacturing fishing rods characterized by drawing gold. 2. The method for manufacturing a fishing rod according to claim 1, wherein t-butyl perbenzoate is used as the organic peroxide. 3. The method for manufacturing a fishing rod according to claim 1, wherein benzoin ethyl ether is used as the photosensitizer. 4. The method for manufacturing a fishing rod according to claim 1, wherein a satin woven glass fiber cloth is used as a reinforcing fiber sheet.