JP2003251704A - Method for manufacturing reinforcement of fiber- reinforced thermoplastic resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a reinforcement of a fiber- reinforced thermoplastic resin with high anchoring effect and significantly enhanced reinforcing effect and tenacity. <P>SOLUTION: This method for manufacturing a reinforcement comprises the steps to split reinforcing fibers and impregnate the fibers with a thermoplastic resin, using a curved surface die, a resin bath and a die with a circular sectional nozzle shape and impart a rotating motion to the reinforcing fiber in its circumferential direction to form a continuously spiral thermoplastic resin protuberance on the surface of the reinforcing fiber in its axis. Thus, the reinforcement of the fiber-reinforced thermoplastic resin showing a high anchoring effect can be manufactured. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a fiber-reinforced thermoplastic resin reinforcing material which has a high anchoring effect and remarkably improves the reinforcing effect and toughness.

[0002]

2. Description of the Related Art Reinforcement by reinforcing bars is generally used as a method for reinforcing concrete structures. In recent years, in order to compensate for the low tensile strength of concrete, measures for improving the tensile resistance of concrete by kneading steel fibers or organic fibers have been studied. According to "Knowledge of steel products for construction" published by Japan Textile Club, steel fibers are mixed with concrete in a volume ratio of about 1 to 1.5% to improve 1) tensile strength, bending strength, and shear strength. It has features such as 2) high toughness, large allowable deformation, 3) improved impact resistance, and 4) improved resistance to cracking. However, steel fibers that have been subjected to rust prevention treatment, etc., after the cracks in the concrete, the surface of the steel fibers may be damaged by water from the cracks and friction due to expansion and contraction of the concrete structure due to the temperature difference between day and night. There is a drawback that it easily rusts. Further, once rust occurs in the steel fibers, the rust causes the volume expansion of the steel fibers and accelerates cracking, which causes accelerated deterioration of the strength of the concrete structure. Furthermore, while the density of concrete is 2 to ³ ton / m ³ , the density of steel fibers is about 7.8 ton / m ³ , which has a large strengthening effect.
Not only contributes little to weight reduction, but also causes an increase in mass.

In order to compensate for these two drawbacks of steel fiber such as rust and increase in mass, in recent years, reinforcement using organic fibers has been attempted. For example, Japanese Patent Laid-Open No. 9-86984 proposes concrete reinforcement with polypropylene fibers. Polypropylene has a density of 0.9ton / m ³ or less, is lightweight, and does not rust, so it is said to be optimal for concrete reinforcement. However, since the density is lighter than that of water, it has a drawback that it floats on water during kneading with concrete and uniform dispersion cannot be obtained. In order to solve this, Japanese Patent Laid-Open No. 10-236855 attempts to obtain a uniform dispersibility and an affinity for concrete by attaching a surfactant. Although various improvements have been made in this way, a satisfactory reinforcing effect cannot be obtained because polypropylene originally has low strength and elastic modulus. Further, in Japanese Patent Laid-Open No. 11-222784, one or more reinforcing material wire rods having a convex portion formed on the peripheral surface are twisted together, and the reinforcing material wire rod having a convex portion is arranged at a position exposed on the surface. ing. The rod is shown. However, the protrusions of this rod are such that the fibers forming the protrusions are spirally wound around the rod having the thermosetting resin layer formed around the reinforcing fibers at a certain interval to cure the thermosetting resin layer,
A method is disclosed in which a plurality of the obtained composite rods are bundled and twisted to manufacture. In addition, a rod in which a plurality of protrusions are independently formed is formed by forming protrusions including independent fibers on each rod, and then heat-curing the thermosetting resin layer to obtain a plurality of reinforcements. A method of manufacturing by bundling and twisting wire rods is also shown. The rods thus obtained are only twisted together and not bonded to each other.Since the number of rods increases and the breaking load level increases, the reinforcing material wires slide, so fiber-reinforced reinforcement It is said that it will exhibit high flexibility as a material cable. However, since the thermoplastic resin is used, after the thermoplastic resin is attached to the reinforcing fiber, a heating effect step of solidifying the resin is necessary, and since the solidification of the resin takes time, the manufacturing process becomes long, There were drawbacks such as not improving the process speed.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned situation, an object of the present invention is to provide a light weight resin which does not rust and has a high strength and a high elastic modulus. The present invention provides a method for producing a fiber-reinforced thermoplastic resin reinforcing material that forms protrusions on the surface.

[0005]

That is, the present invention has the following constitution. 1. A method for manufacturing a reinforcing material by impregnating a reinforcing fiber with a thermoplastic resin, which comprises attaching the thermoplastic resin by passing the opened reinforcing fiber through a curved die and a resin bath, and then having a round-section nozzle shape. A method for producing a fiber-reinforced thermoplastic resin reinforcing material, characterized in that the amount of resin adhered is adjusted by passing through a die, and the reinforcing fibers are taken off by a take-off roller. 2. The method for producing a fiber-reinforced thermoplastic resin reinforcing material according to the first aspect, wherein the fiber-reinforced thermoplastic resin reinforcing material forms continuous thermoplastic resin protrusions on the surface of the reinforcing fiber axial direction. . 3. Reinforcing fiber between the die and the take-up roller A rotational motion larger than the nozzle diameter is applied to the thermoplastic resin reinforcement material in the circumferential direction, and the yarn path of the fiber reinforcement thermoplastic resin reinforcement material forms a conical die. 3. The method for producing a fiber-reinforced thermoplastic resin reinforcing material according to the above 1 or 2, wherein the thermoplastic resin protrusions are formed. 4. The yarn path of the fiber reinforced thermoplastic resin reinforcing material pulled out from the die forms a truncated cone, and at the bottom surface of the truncated cone, the drawing speed from the die and the rotational speed in the bottom circumferential direction satisfy the formula (1). The method for producing a fiber-reinforced thermoplastic resin reinforcing material according to any one of the first to third aspects, which is characterized. 10 ≦ r / vy ≦ 10000 (1) However, vy: drawing speed [m / min] r: rotation speed [rpm]. 5. The yarn paths of the fiber-reinforced thermoplastic resin reinforcing material passing through the die form a truncated cone, and the angle between the generatrix and the horizontal line is 1 ° to 45 °.
A method for producing a fiber-reinforced thermoplastic resin reinforcing material according to any one of 1. 6. 6. The method for producing a fiber-reinforced thermoplastic resin reinforcing material according to any one of the above 1 to 5, wherein the shape of the die nozzle has a ratio of the nozzle diameter to the length of the parallel portion satisfying the expression (2). 0.5 ≦ L / d ≦ 50 (2) However, L: parallel length of nozzle [mm] d: nozzle diameter [mm] 7. Manufacturing of the fiber-reinforced thermoplastic resin reinforcing material according to any one of the above 1 to 6, wherein the shape of the die nozzle is such that the introduction angle of the introduction portion reaching the nozzle parallel portion is 20 ° or more and 80 ° or less. Method. 8. The method for producing a fiber-reinforced thermoplastic resin reinforcing material according to any one of the above 1 to 7, wherein the fiber-reinforced thermoplastic resin reinforcing material is a concrete reinforcing material.

The present invention will be described in detail below. First, the fiber-reinforced thermoplastic resin reinforcing material (hereinafter abbreviated as “reinforcing material”) referred to in the present invention refers to a molded product obtained by coating / impregnating reinforcing fibers with a thermoplastic resin. Next, the continuous spiral thermoplastic resin projections arranged on the surface of the reinforcing fiber in the axial direction are thread-shaped projections formed on the surface of the reinforcing material as shown in FIG. In addition, the curved surface die referred to in the present invention means an included angle such as 4 in FIG.
It has a curved surface of 45 ° or more and 180 ° or less, and has a resin discharge slit within 20 ° from the position where the reinforcing fiber first contacts the curved surface die. The yarn path of the fiber-reinforced thermoplastic resin reinforcing material coming out of the die forms a truncated cone, and the rotary motion given to the thermoplastic resin reinforcing material is the axis between the nozzle center and the processing machine as shown in FIG. To the movement in the circumferential direction. Finally, the nozzle diameter, the length of the parallel portion, and the introduction angle of the introduction portion reaching the nozzle parallel portion are shown in FIG.
Say what is shown in. The reinforcing material according to the present invention includes a unwinding device 1, an opening device 3, a curved surface die 4, a resin bath 5, a die 5 having a round cross-section nozzle shape, and a reinforcing material in a plane perpendicular to the axial direction of the reinforcing material. It can be efficiently manufactured by using a series of devices including a processing machine 7, a take-up device 8 and a take-up device 9 which give a rotary motion to the. The object of the present invention is good resin impregnation between the reinforcing fibers,
It is an object of the present invention to provide a manufacturing apparatus for forming a spiral protrusion made of resin around a reinforcing fiber. Therefore, in order to achieve the present invention, a means for improving resin impregnation and a means for shaping the spiral protrusion are necessary. The following steps are required as means for improving resin impregnation. First, the reinforcing fiber 1 is provided with a treating agent such as an oil agent or a sizing agent for the purpose of improving the operability in the manufacturing process and the post-process. For this reason, the reinforcing fibers have a short distance between the monofilaments constituting the reinforcing fibers, and there is a drawback that it is difficult to obtain resin impregnation in which the resin penetrates between the reinforcing fibers. Therefore, in order to select a good resin impregnation, it is necessary to open the fiber by a means such as spreading the reinforcing fiber to provide a sufficient space between the monofilaments to facilitate resin impregnation.

The fiber-spreading device 2 includes bar fiber-spreading, roller fiber-spreading, air fiber-spreading, etc., which have been conventionally used, but the bar fiber-spreading is preferable from the viewpoint of equipment cost. When performing bar opening, the tension applied to the reinforcing fiber is raised as an item that requires special attention. Tension is mainly 1. Tension to enter the fiber opening bar and 2. The tension generated on the fiber opening bar due to frictional resistance can be divided into two, but the tension at the fiber opening bar outlet that combines these two is 5% or more and 50% or less of the breaking strength of the reinforcing fiber. Preferably there is. If it is less than 5%, the reinforcing fibers may dance on the opening bar. When it is 50% or more, the monofilament constituting the reinforcing fiber is broken and the process passability is deteriorated.
This may cause problems such as insufficient opening of fibers. Therefore, in order to manage the tension, the yarn feeding tension, the material of the open war bar that determines the friction coefficient between the reinforcing fiber and the open bar, the surface roughness, the diameter and interval of the open war bar that determines the contact length, the number, The diameter of the opening bar needs to be carefully considered according to the minimum bending radius of the fiber.

Next, the curved surface die 4 adheres to the resin after one of the opened reinforcing fibers comes into contact with the resin, but the other is released, so that the air existing between the reinforcing fibers can be easily pushed out, and the reinforcing fibers can be easily pushed out. It is very important to promote the impregnation of the resin in the space. It is necessary for the curved die to take into consideration the viscosity of the resin, the strength / elongation of the reinforcing fiber, the processing speed, etc. The radius is preferably 20 mm or more and 150 mm or less, though it varies depending on the organic fiber / inorganic fiber and the oil / bunching agent.

Further, the resin bath 5 is sufficiently filled with resin, and it is necessary to have a volume capable of sufficiently supporting the resin pressure generated in the nozzle portion of the die. Further, it is important to be able to absorb the fluctuation of the resin discharge amount from the nozzle due to the fluctuation of the fineness of the reinforcing fiber.

Finally, the die 5 having a nozzle shape is as important for resin impregnation as the curved die 4. The die can be divided into an introduction portion and a nozzle portion as shown in FIG. The introduction part plays a role of promoting impregnation of the opened reinforcing fibers when passing through the resin bath, re-focusing and guiding to the nozzle part. For good impregnation, the introduction angle of this introduction part is preferably 20 ° or more. If it is less than 20 °, the pull-out resistance becomes extremely high, although it depends on the viscosity of the resin, causing breakage of the reinforcing fiber. The nozzle portion preferably has an L / d ratio of 0.5 or more and 50 or less, where L is the length of the nozzle parallel portion and d is the nozzle diameter. If the L / d is less than 0.5, the shear resistance between the resin and the nozzle wall surface at the nozzle will be small, and impregnation will be poor. On the other hand, when it is 50 or more, the shear resistance becomes large, and although it depends on the strength of the reinforcing fiber, fiber breakage easily occurs, which is a problem in passing through the process. More preferably, it is 1 or more and 20 or less.

The following means can be considered as means for imparting the spiral projections to the reinforcing material. For example, a method of winding a thermoplastic resin fiber around a reinforcing material pulled out from a die, melting the resin again and adhering the fiber to the resin, a method of shaping the reinforcing material through a rotary die having spiral grooves cut, and a die. It is possible to install a disk that rotates in the circumferential direction of the reinforcing material between the take-up devices and rotate the disk to eccentrically shape the reinforcing material. Of these, the method of covering the thermoplastic resin fibers has drawbacks such as adhesion of the resin and difficulty in removing voids because the fibers and the resin of the reinforcing material are fused by atmospheric pressure. Further, the method of passing the resin through a rotary die has a drawback that the resin of the reinforcing material is easily attached to the rotary die, resulting in clogging of holes and poor productivity. The present invention proposes a method in which a disk that rotates in the circumferential direction of the reinforcing material is installed between the die and the take-up device, and the disk is rotated to eccentrically shape the reinforcing material. The reinforcing material 6 pulled out from the die 5 passes through the processing machine 7 located between the reinforcing material 6 and the take-up device. This processing machine has a method in which a through hole is formed concentrically with respect to the central axis on a rotating disk having no through axis in the center as shown in FIG. 4, and a reinforcing material is passed through the through hole to decenter the axis. is there. Here, the characteristic feature of this rotating disk is that it has no axis in the center, that its outer circumference is supported by three free rollers, and that it is driven by arranging a gear at its lower point. By adopting such a supporting and driving method, it becomes possible for the first time to carry out a rotational motion in the circumferential direction of the rotating disk without the reinforcing material being entangled with the rotating disk.

Further, in order to increase the number of spindles, a device as shown in FIG. 4 can be used. A connecting rod is arranged on the side surfaces of a pair of gears whose outer circumferences are connected by a timing belt and rotate at the same cycle, and a through hole is provided in this connecting rod to pass a reinforcing material. When the gear rotates, the through hole also rotates in synchronization with this. By adopting such a structure, it is possible to easily increase the number of spindles. The spiral protrusion is formed on the nozzle portion of the die. When the rotary motion is imparted to the reinforcing material pulled out from the nozzle portion by the processing machine as described above, the reinforcing material rotates rotationally along the inner diameter of the nozzle in the nozzle portion. If the inner diameter of the nozzle is larger than the apparent diameter of the bundled reinforcing fibers, the reinforcing fibers will scrape off the resin on the front surface in the rotation direction, and as a result, resin protrusions will form on the reinforcing fibers.

The important items in the shape of the reinforcing material are 1) the period (pitch) of the protrusions, 2) the diameter difference between peaks and valleys, and 3) the shape of peaks and valleys.
Is one. Both of them are important items for developing the anchor effect between the reinforcing material and the concrete when they are buried in concrete. Pitch determines the anchor effect of the reinforcement, the critical fiber length that produces the minimum pull-out shear stress. The peak-to-valley diameter difference and the peak-to-valley shape determine the magnitude of the pulling shear stress after the critical fiber length is determined. A shorter pitch is preferred to reduce the critical fiber length. If the diameter difference is too large, cohesive failure of the resin occurs, and pull-out shear stress is rather reduced. If it is too small, the catching becomes small and sufficient pulling shear stress cannot be obtained.
Therefore, in order to control the pitch, the diameter difference, and the shape, it is important to design the processing machine and the die that give the rotary motion. First, the pitch is determined by the rotation speed of the processing machine. Therefore, the rotation of the processing machine is required to have no unevenness in rotation, no shake in the shaft center, and to be able to rotate at high speed. Rotational spots lead to pitch fluctuations,
You must be careful. To eliminate rotation spots,
For example, in the case of the processing machine shown in FIG. 4, it is effective to reduce the moment of inertia due to the weight reduction of the connecting rod and to attach a balancer or the like. There is no problem if the uneven rotation is 10% or less of the predetermined number of rotations. When this rotation speed is r [rpm] and the processing speed is vy [m / min], the ratio r / vy of these is preferably 10 or more and 10000 or less.
It is more preferably 66 or more and 5000 or less, and further preferably 200 or more and 3000 or less. The physical meaning of this r / vy is the pitch period with respect to the processing speed.

Next, the diameter difference is determined by the radius of gyration of the processing machine, the distance from the die, and the shape of the die / nozzle portion. These two conditions are determined by the size of the truncated cone formed between the nozzle and the processing machine. When the angle formed by the generatrix of the truncated cone and the horizontal line becomes smaller, the radius of gyration of the reinforcing material at the nozzle outlet becomes smaller and the diameter difference becomes smaller. When the angle is increased, the difference in diameter tends to increase, but since the reinforcing fiber is bent at the nozzle outlet and the through hole of the processing machine, there is a problem that the reinforcing fiber is greatly damaged. Therefore, this angle is preferably 1 ° to 45 °. It is more preferably 1 ° to 30 °, and even more preferably 1 ° to 10 °. As described above, the introduction part and the nozzle part are important in designing the die. Regarding the diameter difference, the outer diameter (diameter of the crest) is substantially determined by the reinforcing fiber and the nozzle diameter when converged, and the inner diameter (diameter of the valley) is determined by the volume of the nozzle and the introduction angle (α) of the introduction part . The reason for this is not clear, but it is considered that the volume of the nozzle portion is almost equal to the volume of the protrusion because the protrusion is formed by scraping the resin inside the nozzle by the reinforcing fiber.

If the volume of the nozzle portion, the nozzle diameter is d, and the length is L, the volume V is determined by V = πdL. When the desired fiber / resin ratio is determined in order to secure the performance of the reinforcing material, d is inevitably determined, and therefore the volume of this portion is determined by approximately L. The smaller V is, the clearer the protrusion is, and the larger the difference in diameter between the peak and the valley is. In addition, the shape is also thin and becomes a clear peak-valley. Further, the introduction angle of the introduction portion also has a great effect. The reason for this is not clear, but when the introduction angle becomes small, the inclination of the introduction part to the nozzle part becomes gentle and the rate of change of the diameter becomes small, so the nozzle effect increases and the apparent L becomes longer. Can be considered. On the contrary, it is considered that when the introduction angle becomes large, the effect of the nozzle becomes small and the apparent L becomes close to the actual L.

As described above, the impregnation of the resin between the reinforcing fibers is better as the length L of the nozzle portion is longer, and it is preferable that the introduction angle is smaller. However, in consideration of the shape of the protrusion that greatly affects the anchor effect, it is preferable that L is short and the introduction angle is large in order to increase the diameter difference between the peak and the valley. In order to solve the conflicting problems, L / d is preferably 0.5 or more and 20 or less, more preferably 1 or more and 10 or less. Further, the introduction angle is preferably 20 ° or more and 80 ° or less,
More preferably, it is 30 ° or more and 60 ° or less.

As described above, the reinforcing material impregnated with the resin and having the projections formed thereon is taken up by the take-up roller 8 and then wound on the bobbin by the winder 9. The wound reinforcing material is cut into a predetermined length using a guillotine cutter or an Eastman cutter,
When kneaded with concrete, a structure having extremely high toughness can be obtained. Alternatively, if it is continuously used as a reinforcing bar, a lightweight and highly tough structure can be obtained.

The reinforcing fibers used in the reinforcing material of the present invention may be inorganic fibers, organic fibers or metal fibers, but organic fibers are preferred. This is because the organic fiber exhibits ductile fracture and has the property of "difficult to break" as compared with the inorganic fiber typified by carbon fiber and glass fiber. Therefore, for example, even if the tip of a crack propagating in concrete is sharp and high stress is applied to the reinforcing fiber, brittle fracture does not occur unlike the case of the inorganic fiber. Examples of the organic fiber that causes such ductile destruction include the following. Examples thereof include polyethylene fiber, polyamide fiber, polyester fiber, polyvinyl alcohol fiber, polyethylene-vinyl alcohol fiber, acrylic fiber, polyaramid fiber, polyketone fiber, polyparaphenylene benzobisoxazole fiber, and the like. Since concrete is a strong alkali having a pH of 13 or more, additives may be added for the purpose of imparting alkali resistance to these fibers and avoiding alkali hydrolysis and the like. In order to make the concrete structure have high strength and high elastic modulus, the reinforcing fiber used is preferably so-called super fiber, and among the above, polyethylene fiber, polyaramid fiber, and polybisphenylene oxazole fiber are particularly preferable.

It is more preferable that these reinforcing fibers have been subjected to treatments such as corona treatment, plasma treatment and chemical etching in order to improve the adhesiveness with the resin. The resin combined with the reinforcing fibers as the reinforcing material is preferably a thermoplastic resin. Among them, the breaking elongation
It is preferable that the thermoplastic resin is 200% or more. A problem of concern in composite materials is delamination due to the destruction of the resin present between the reinforcing fibers. Generally, a thermoplastic resin has a large breaking elongation and a toughness as compared with a thermosetting resin, but among them, it is preferable to use a resin having a breaking elongation of 200% or more. More preferably, it is 500% or more.

The thermoplastic resin having such performance is, for example, a polyolefin resin such as polyethylene, polypropylene or polyethylene vinyl alcohol copolymer,
Although the polyamide resin and the like can be increased, it is preferable to select it after sufficiently considering the affinity with concrete and reinforcing fibers. As in the case of the reinforcing fiber, various additives such as an alkali deterioration preventing agent, a heat deterioration preventing agent and an oxidative deterioration preventing agent may be contained. Further, there is no problem even if an acid modification treatment, plasma treatment, corona treatment or the like is performed for the purpose of improving the adhesiveness with the reinforcing fiber. The reinforcing fiber used for the reinforcing material is preferably polyparaphenylenebenzobisoxazole fiber, which is a fiber having high strength / high elastic modulus because of its rigid molecule and high orientation. This polyparaphenylene benzobisoxazole fiber (hereinafter abbreviated as PBO fiber) has the highest specific strength / specific elastic modulus and is optimal as a reinforcing fiber for a concrete reinforcing material. The thermoplastic resin to be combined with the PBO fiber is preferably an ethylene vinyl alcohol copolymer (hereinafter abbreviated as EVOH). This ethylene vinyl alcohol copolymer has good wettability and can improve the adhesiveness or wettability with PBO fibers, and is optimal for increasing the toughness.

[0021]

EXAMPLES In order to evaluate the effect of the present invention, a pull-out test from concrete was conducted. The commercially available "HS Instant Cement by Hatanaka Sangyo Co., Ltd." was used. 160 g of water was added to 1 kg of this cement, and the mixture was sufficiently kneaded and then filled in a polyethylene content volume 100 cc discup, and each sample was embedded in this, followed by standard curing. The pull-out test was performed on the obtained 28-day-old specimen with a 5 ton Tensilon manufactured by Orientec Co., Ltd. at a pulling speed of 20 mm / min. The pull-out test results are all average values of 5 times.

Example 1 An ethylene vinyl alcohol copolymer “Eval” (105B) manufactured by Kuraray Co., Ltd. was applied to a polyparaphenylene benzobisoxazole fiber “Zylon” (AS, fineness 1110dtex) manufactured by Toyobo Co., Ltd. as follows. Was impregnated and shaped. The reinforcing fiber is taken off by force, and it is opened by alternately contacting with 5 stainless steel cylinders with a diameter of 100 mm, and then contacted with a curved die having a 1/4 circle with a radius of 50 mm to advance the reinforcing fiber. The resin was discharged from a slit provided at a position of 10 ° from the lower surface in the direction to impregnate the reinforcing fiber with the resin. After that, resin temperature 220 ± 20 ℃
After passing through the resin bath, the inlet angle is 30 ° and the nozzle diameter is φ0.6m.
Melt impregnation was performed through a die with m and a parallel part length of 0.5 mm. Using the processing machine shown in Fig. 4, turning radius 25 mm, number of rotations
Under the conditions of 50 rpm and a processing speed of 0.5 mm / min, a reinforcing material having a protrusion in which EVOH was spirally wound was obtained. This composite material 10
It was cut to a length of 0 mm, and a test piece was prepared under the condition that the embedding length was 15 mm. Table 1 shows the pull-out test results of this test body.

(Example 2) Table 1 shows the pull-out test results of the test pieces under the conditions different from Example 1 except that the rotation speed was 100 rpm.

(Example 3) A reinforcing material having protrusions in which EVOH was spirally wound was obtained under the conditions different from Example 1 only in that the rotation speed was 200 rpm. Table 1 shows the pull-out test results of this test body.

Example 4 A reinforcing material having a projection in which EVOH was spirally wound was obtained under the condition different from that of Example 1 only in that the rotation speed was 300 rpm. Table 1 shows the pull-out test results of this test body.

Example 5 A reinforcing material having a projection in which EVOH was spirally wound was obtained under the conditions different from that of Example 1 only in that the rotation speed was 600 rpm. Table 1 shows the pull-out test results of this test body.

(Example 6) A reinforcing material having protrusions in which EVOH was spirally wound was obtained under the conditions different from Example 1 only in that the rotation speed was 900 rpm. Table 1 shows the pull-out test results of this test body.

(Embodiment 7) The introduction angle of the die introduction section is 60.
Under the conditions that the rotation speed was 1,100 rpm, and the processing speed was 1.0 m / min, which were different from those of Example 1, a reinforcing material having a protrusion in which EVOH was spirally wound was obtained. Table 1 shows the pull-out test results of this test body.

(Example 8) A reinforcing material having a projection in which EVOH was spirally wound was obtained under the conditions different from that of Example 1 except that the introduction angle was 10 °. Table 1 shows the pull-out test results of this test body.

(Embodiment 9) Nozzle diameter is 0.6 mm and length is 5 mm.
The condition different from that of Example 1 is that only the dice of
A reinforcing material having a protrusion in which EVOH was spirally wound was obtained.
Table 1 shows the pull-out test results of this test body.

(Embodiment 10) Nozzle diameter is 0.6 mm and length is 2
Under the conditions different from those of Example 1 except that a 0 mm die was used, a reinforcing material having a protrusion in which EVOH was spirally wound was obtained. Table 1 shows the pull-out test results of this test body.

(Example 11) PP has a spirally wound protrusion under the conditions different from Example 1 in that the thermoplastic resin is polypropylene (hereinafter abbreviated as PP) "Nobrene" manufactured by Grand Polymer Co., Ltd. A reinforcing material was obtained. Table 1 shows the pull-out test results of this test body.

(Example 12) A projection in which PA6 was spirally wound under a condition different from that of Example 1 in that the thermoplastic resin was polyamide 6 (hereinafter abbreviated as PA6) "TOYOBO Nylon" manufactured by Toyobo Co., Ltd. A reinforcing material having Table 1 shows the pull-out test results of this test body.

(Example 13) The reinforcing fiber was polyaramid fiber "Kevlar 49" manufactured by Toray Industries, Inc. Example 1
Under conditions different from those described above, a reinforcing material having protrusions in which EVOH was spirally wound was obtained. Table 1 shows the pull-out test results of this test body.

(Example 14) The reinforcing fiber is Hexcel Corpora.
EVOH was obtained as a reinforcing material having protrusions spirally wound under the conditions different from Example 1 only in that it was carbon fiber "HERCULES AS4" manufactured by tion. Note that this test piece broke without pulling the reinforcing material from the concrete.

(Embodiment 15) The nozzle diameter is 0.6 mm and the length is
EVOH under the conditions different from Example 1 except that it is 0.2 mm.
Thus, a reinforcing material having a protrusion spirally wound was obtained. Table 1 shows the pull-out test results of this test body.

(Comparative Example 1) Kuraray Co., Ltd. ethylene vinyl alcohol copolymer "Eval" (105B) was introduced into Toyobo Co., Ltd. polyparaphenylene benzobisoxazole fiber "Zylon" (AS, fineness 1110dtex).
°, Nozzle diameter φ0.6 mm, and parallel part length 0.5 mm were used for melt impregnation to obtain a reinforcing material. No protrusion was observed on the surface of this rod. Table 1 shows the pull-out test results of this test body.

(Comparative Example 2) Under the conditions different from those of Example 1, only the rotation speed was 8 rpm and the take-up speed was 1.0 m / min.
A reinforcing material having a protrusion in which EVOH was spirally wound was obtained.
Table 1 shows the pull-out test results of this test body.

(Comparative Example 3) A reinforcing material having a projection in which EVOH was spirally wound was obtained under the conditions different from those of Example 1 except that the rotation speed was 1500 rpm and the take-up speed was 0.1 m / min. Table 1 shows the pull-out test results of this test body.

(Comparative Example 4) Nozzle diameter is 0.6 mm and length is 60 m.
An attempt was made to process the reinforcing material under the conditions different from Example 1 only in that the length was m, but the yarn was frequently broken at the nozzle exit, and the processing could not be performed.

(Comparative Example 5) An attempt was made to process the reinforcing material under the conditions different from those of Example 1 except that the introduction angle was 5 °.
Thread breakage occurred frequently at the nozzle exit and processing was not possible.

(Comparative Example 6) A reinforcing material having a projection in which EVOH was spirally wound was obtained under the conditions different from that of Example 1 except that the introduction angle was 90 °. Table 1 shows the pull-out test results of this test body.

[0043]

[Table 1]

[0044]

According to the present invention, the anchor effect is high,
It has become possible to obtain a fiber-reinforced thermoplastic resin reinforcing material that remarkably improves the reinforcing effect and toughness.

[Brief description of drawings]

FIG. 1 is an example of a fiber-reinforced thermoplastic resin reinforcing material according to the present invention.

FIG. 2 is a schematic view of a manufacturing process of the present invention.

FIG. 3 is a cross-sectional view of a die of the present invention.

FIG. 4 is a front view and a side view of a processing machine of the present invention.

FIG. 5 is a front view and a side view of the processing machine of the present invention.

[Explanation of symbols] 1. Krill stand 2. Reinforcing fiber 3. Opening bar 4. Curved die 5. Impregnation die 6. Reinforcement material 7. Processing machine 8. Take-up roller 9. Winder 10. Introduction department 11. Nozzle part 12. Through hole 13. Free roller 14. Drive gear 15. Rotating disk 16. Drive disk 17. Connecting rod 18. Timing belt 19. Driven disk 20. Through hole 21. Drive motor

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B29L 31:06 B29C 67/14 D (72) Inventor Shuji Hidaka 2-1-1 Katata, Otsu, Shiga Prefecture Toyobo Achievement in Research Institute Co., Ltd. (72) Inventor Akira Matsuzoe 1-1-1 Katata, Otsu City, Shiga Toyobo Co., Ltd. Research Institute in Japan (72) Manabu Naito 1-1-1 Katata, Otsu City, Shiga Prefecture Toyobo Achievements F-term in Research Institute Co., Ltd. (reference) 2E164 AA04 4F205 AA04 AA11 AA19 AD16 AG14 AH47 AR07 AR08 AR09 HA05 HA34 HA46 HB02 HC02 HK07 HK08 HK19 HK21 HL13 4F213 AA19 AA35 AG23 AG26 AH06 AJ08 WA06 WA11 WA02 WA33 WA38 WA38 WA38 WB21 WE02 WE06 WE07 WE09 WE16 WF01 WF05 WK03 WW06 WW15 WW21 WW24 WW26

Claims (8)

[Claims] 1. A method for producing a reinforcing material by impregnating a reinforcing fiber with a thermoplastic resin, wherein the opened reinforcing fiber is passed through a curved die and a resin bath so that the thermoplastic resin is adhered to the reinforcing fiber. A method for producing a fiber-reinforced thermoplastic resin reinforcing material, characterized in that the amount of resin adhering is adjusted by passing through a die having a cross-sectional nozzle shape, and the reinforcing fibers are taken up by a take-up roller. 2. The fiber-reinforced thermoplastic resin reinforcing material according to claim 1, wherein the fiber-reinforced thermoplastic resin reinforcing material forms continuous thermoplastic resin protrusions on the surface of the reinforcing fiber in the axial direction. Reinforcement manufacturing method. 3. The thermoplastic resin reinforcement is provided with a rotational movement in the circumferential direction of the reinforcement fiber larger than the nozzle diameter between the die and the take-up roller, and the yarn path of the fiber-reinforced thermoplastic resin reinforcement forms a conical die. The method for producing a fiber-reinforced thermoplastic resin reinforcing material according to claim 1 or 2, wherein a continuous spiral thermoplastic resin protrusion is formed. 4. The fiber path of the fiber reinforced thermoplastic resin reinforcing material drawn out from the die forms a truncated cone, and the drawing speed from the die and the number of revolutions in the circumferential direction of the bottom are (1) at the bottom of the truncated cone. The method for producing a fiber-reinforced thermoplastic resin reinforcing material according to any one of claims 1 to 3, wherein the formula is satisfied. 10 ≦ r / vy ≦ 10000 (1) However, vy: drawing speed [m / min] r: rotation speed [rpm]. 5. The fiber path of the fiber-reinforced thermoplastic resin reinforcing material passing through the die forms a truncated cone, and the angle between the generatrix and the horizontal line is 1 ° to 45 °. 5
A method for producing a fiber-reinforced thermoplastic resin reinforcing material according to any one of 1. 6. The fiber-reinforced thermoplastic resin reinforcement according to claim 1, wherein the shape of the die nozzle is such that the ratio of the nozzle diameter to the length of the parallel portion satisfies the expression (2). Method of manufacturing wood. 0.5 ≦ L / d ≦ 50 (2) where L: parallel length of nozzle [mm] d: nozzle diameter [mm] 7. The fiber-reinforced thermoplastic according to any one of claims 1 to 6, wherein the die nozzle has a shape in which an introduction angle of an introduction portion reaching a nozzle parallel portion is 20 ° or more and 80 ° or less. A method for manufacturing a resin reinforcing material. 8. The method for producing a fiber-reinforced thermoplastic resin reinforcing material according to any one of claims 1 to 7, wherein the fiber-reinforced thermoplastic resin reinforcing material is a concrete reinforcing material.