KR20110131566A

KR20110131566A - Method for manufacturing fiber-reinforced plastic and fiber-reinforced plastic using the same

Info

Publication number: KR20110131566A
Application number: KR1020100051068A
Authority: KR
Inventors: 김영욱
Original assignee: 주식회사 비앤씨
Priority date: 2010-05-31
Filing date: 2010-05-31
Publication date: 2011-12-07
Also published as: WO2011152631A3; WO2011152631A2

Abstract

Disclosed are a method for producing a fiber-reinforced plastic and a fiber-reinforced plastic using the same, in which the final dispersion of the fiber can be smoothly solved while more reliably solving the single yarn problem of the fiber. The method of manufacturing a fiber-reinforced plastic according to an embodiment of the present invention comprises the steps of preparing a fiber filament bundle used in the manufacture of the fiber-reinforced plastic, applying a twist to the fiber filament bundle, the twist Impregnating the applied fiber filament bundle with a resin solution, releasing the twist of the impregnated fiber filament bundle, and injecting the fiber filament bundle. According to such a configuration, it is possible to obtain a fiber-reinforced plastic in which the final dispersion is smoothly solved while effectively solving the single yarn problem of the fiber bundle.

Description

Manufacturing method of fiber-reinforced plastics and fiber-reinforced plastics using the same {METHOD FOR MANUFACTURING FIBER-REINFORCED PLASTIC AND FIBER-REINFORCED PLASTIC USING THE SAME}

Disclosed are a method for producing a fiber reinforced plastic and a fiber reinforced plastic using the same. More specifically, there is disclosed a method for producing a fiber-reinforced plastic and a fiber-reinforced plastic using the same, which can achieve a final dispersion of the fiber smoothly while solving the problem of the single yarn of the fiber more reliably.

The major development issues of plastics, which are widely applied throughout the industry, are the improvement of physical properties such as plastic weight, tensile strength and durability. Among them, the demand for plastic materials with excellent tensile strength and excellent long-term durability in the fields of household appliances, automobiles, electronics, and general industries is increasing. In particular, in the case of household appliances, electronic parts, and automobile parts, The demand is very high.

In response to this demand, a method of reinforcing plastic materials using various methods has been used. Among them, the fiber bundle is released from the bundle of the fiber filaments, or the fiber bundle is released from the mixed bundle of the thermoplastic resin filament and the fiber filament, such as polypropylene or polyamide, and then they are unfolded to melt a part of the fiber or melt. BACKGROUND OF THE INVENTION A method of impregnating, coating or / and attaching a thermoplastic resin dissolved in a fiber filament by heat or a solvent is known.

That is, in general, when manufacturing a reinforced plastic using a fiber bundle, the fiber bundle is impregnated into a variety of resin solutions as described above. At this time, the resin solution is subjected to the operation of unfolding the fiber bundle using a roller or the like so that the resin solution can be evenly spread between the fiber bundles.

Once the impregnated fiber bundle is ready, the fiber bundle is twisted to prevent the single yarn problem of breaking and to increase the production rate of the reinforced plastic. Generally, the impregnated fiber bundles are twisted within the range of 15 to 60 °. The twisted fiber bundle is cut to a predetermined length and then reinforced plastic is produced using the twisted fiber bundle.

However, in order to solve the problem of single yarns in the fiber bundle, when the fiber bundle is twisted and the reinforced plastic is injected, the fiber bundles are aggregated in a certain portion without being evenly distributed. Poor dispersion of fiber bundles can lead directly to poor appearance as well as poor performance.

In addition, after the fiber bundle is coated with the resin solution by impregnation, the twist angle is limited to the range of 15 to 60 °, so that the effect of single yarn prevention is not shown properly, and in general, about 30% of the fiber bundle is lost. This can happen.

According to one embodiment of the present invention, there is provided a method for producing a fiber-reinforced plastic, and a fiber-reinforced plastic using the same, which provides a step of twisting before the fiber bundle is impregnated with the resin solution.

In addition, there is provided a fiber-reinforced plastic manufacturing method and a fiber-reinforced plastic using the same to increase the twist angle of the fiber bundle to more reliably solve the single yarn yarn problem of the fiber bundle and to improve the productivity and quality of the reinforced plastic.

In addition, there is provided a fiber-reinforced plastic manufacturing method and a fiber-reinforced plastic using the same to provide a step of releasing the twisted fiber bundle after the impregnation of the fiber bundle to evenly disperse the fiber bundle during injection of the plastic bundle.

The method of manufacturing a fiber-reinforced plastic according to an embodiment of the present invention for solving the above problems is to prepare a fiber filament bundle used in the manufacture of fiber-reinforced plastic, twisted to the fiber filament bundle ( applying a twist), immersing the twisted fiber filament bundle in a resin solution, releasing the twist of the impregnated fiber filament bundle, and ejecting the fiber filament bundle.

According to one side, releasing the twist may include heating the impregnated fiber filament bundle to remove the coated resin, and releasing the twist of the fiber filament bundle from which the resin has been removed. .

According to one side, the step of removing the coated resin and releasing the kink may be made integrally with the injection step.

According to one side, the fiber filament may be made of at least one of glass fiber, carbon fiber, natural fiber, aramid fiber, rayon fiber, graphite fiber, metal fiber, or allylate fiber.

According to one side, the impregnating step is preferably blocked the entry of the resin solution into the interior of the fiber filament bundle due to the twist of the fiber filament bundle.

According to one side, the injection step, it is possible to inject only the fiber filament bundle or the resin that is the raw material of the fiber filament bundle and fiber reinforced plastic together.

Fiber-reinforced plastics according to an embodiment of the present invention for solving the above problems is impregnated in the resin solution after twisting the prepared fiber filament bundle, and the coated fiber filament bundle after heating to remove the coated resin The twist is released again and formed through the injection process.

According to one side, the impregnated fiber filament bundle to remove the coated resin by heating the bundle and then to release the twist and the injection process can be made integrally in one injection machine.

According to one side, the impregnation of the fiber filament bundle to which the twist is applied is preferably blocked the entry of the resin solution into the interior of the fiber filament bundle.

According to one side, the injection process, it is possible to inject only the fiber filament bundle or resin as the raw material of the fiber filament bundle and the fiber-reinforced plastic together.

According to one embodiment of the present invention, a step of twisting the fiber bundles before the fiber bundles are impregnated with the resin solution is provided, which can twist the fiber bundles before the resin solution is coated, thereby greatly increasing the angle of twisting. .

In addition, the twist angle of the fiber bundle is greatly increased, thereby effectively blocking the single yarn of the fiber bundle, thereby minimizing the loss of the fiber bundle during the manufacturing process.

In addition, by impregnating the fiber bundles to provide a step of releasing the twisted fiber bundles it is possible to prevent a phenomenon that the fiber bundles agglomerate with each other during plastic injection due to the twist. That is, the final dispersion of the fiber bundle can be made smoothly.

In addition, since the final dispersion of the fiber bundle is smoothly performed, the appearance of the injected fiber-reinforced plastic looks good, the mechanical properties are improved, and the impact resistance is improved. That is, the quality of the product is improved.

1 is a flow chart schematically showing the flow of a method of manufacturing a fiber-reinforced plastic according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The manufacturing method of the fiber reinforced plastic according to one embodiment of the present invention can be used to produce a variety of fiber reinforced plastics. More preferably, it can be used to prepare thermoplastic resin-based plastics such as polyethylene, polypropylene, vinyl chloride resin, vinyl acetate resin, polystyrene, ABS resin, acrylic resin, etc., and can be used to prepare plastics including various other polymers. Can be.

Method for producing a fiber-reinforced plastic according to an embodiment of the present invention is to prepare a fiber filament bundle (S10), applying a twist (S20), impregnation step (S30), releasing the twist (S40), and It includes the injection step (S50).

1 is shown for more detailed description. 1 is a flow chart schematically showing the flow of a method of manufacturing a fiber-reinforced plastic according to an embodiment of the present invention.

In order to manufacture a fiber-reinforced plastic, a fiber filament bundle used to reinforce the plastic product is prepared (S10). Types of fibers include short fibers and long fibers. The type of fiber is not limited, but long fiber is generally preferred.

The fibers gather several strands of fiber filaments to form a bundle. The fibers are prepared by roving in which a plurality of filaments are collected without applying twist. In this case, the number of filaments is generally 1000 (1k), 3000 (3k), 6000 (6k), 12000 (12k) strands can be made and is not limited.

As the type of fiber, it is generally possible to select various fibers that can be used in fiber reinforced plastics. More specifically, at least one of glass fiber, carbon fiber, natural fiber, aramid fiber, rayon fiber, graphite fiber, metal fiber, and allylate fiber may be used, and ultra high molecular weight polyethylene (PE) is a polymer fiber. Fibers, Polyacrylonitrile (PAN) fibers, and Poly Ether Ether Ketone (PEEK) fibers can also be used.

When the fiber is prepared, twist (twist) to the prepared fiber filament bundle (S20). That is, a bundle of a plurality of fiber filaments is twisted in the circumferential direction to provide a twist angle. By twisting the fiber filament bundle in this way, the production speed of the fiber-reinforced plastics can be increased and the single yarn problem of breaking the fiber filaments can be prevented. As a result, the productivity of fiber reinforced plastics is improved.

Although the angle of twist is not limited, it is preferable to twist at an angle of 60 ° or more to reliably prevent the single yarn problem.

The process of twisting the fiber filament bundles takes place prior to impregnation. That is, the fiber filament bundle is twisted before the fiber filament bundle is coated with the resin solution by impregnation, and thus the fiber filament bundle can be twisted at a much larger angle than the conventional one. As mentioned earlier, an increase in the degree of twist can lead directly to a more obvious solution of single-entry problems.

When twist is applied to the fiber filament bundle, the fiber filament bundle to which the twist is applied is impregnated in the resin solution (S30). By this impregnation, the fibers are coated with a molten resin solution by heating as necessary.

As mentioned earlier, the impregnation of the fiber filament bundles takes place after the twisting of the fiber filament bundles. That is, the resin solution is not coated to the inside of the fiber as the fiber is immersed in the resin solution in a twisted state. In other words, many of the fiber filaments located inside the bundle where the fibers are twisted due to the kink are not exposed to the fiber solution.

As the entry of the resin solution into the fiber filament bundle is blocked, the restoring force of returning the twisted fiber filament bundle to its original shape becomes stronger. This resilience allows the fiber filament bundles to easily return to their original shape in the process of releasing the kinks described later, which enhances the dispersion of the fibers in the final injection. The dispersion of the fibers is discussed in more detail later.

When the resin solution is coated on the fiber filament bundle by impregnation, the twist of the fiber filament bundle to which the twist is applied is released (S40). The reason for this untwisting is that the fibers are tangled on the reinforced plastics injected by the kinks. Eventually the twist of the twisted fiber filament bundle is released again to facilitate the final dispersion of the fiber filament bundle.

At this time, the step of releasing the twist includes the step of heating the fiber filament bundle (S41), and the step of releasing the twist of the fiber filament bundle from which the resin is removed (S42).

It is generally difficult to untwist the fiber filament bundle again when the resin solution is coated. Therefore, it is preferable to remove the resin solution coated on the fiber oil filament by heating the fiber filament bundle (S41). At this time, the temperature and heating time to be applied can be variously set according to the environment, such as the type of resin solution, the type of fiber.

When the coated resin solution is removed by heating, the twist of the fiber filament bundle is released (S42). In this case, as described above, the filament located inside the fiber is not coated even after impregnation, which provides the restoring force for the fiber filament bundle to return to its original shape, and it is easier to twist as the resin solution coated on the fiber is removed. Let loose.

According to one side, after the impregnation step or after the step of releasing the twist can be added to the step of cutting (cutting) the fiber filament bundle as needed. This cutting step may be performed before impregnation or after impregnation as necessary. The length of the cutting and the thickness of the fiber may be variously selected according to the environment such as the type of resin, the type of fiber, and the like.

On the other hand, when the twist of the fiber filament bundle is released, the injection process proceeds (S50). In this case, the injection process may be performed using only the fiber filament bundle, or may be made together with a resin which is a raw material of the fiber reinforced plastic. This injection process may be integral with removing the coated resin of the impregnated fiber filament bundle and releasing the twist of the fiber filament bundle from which the resin has been removed.

In more detail, the impregnated fiber is placed in the injection molding machine, or the resin, which is a raw material of the fiber-reinforced plastic together with the impregnated fiber, is put in one injection molding machine. At this time, by adjusting the heating temperature and time of the injection machine to remove the resin solution coated on the fiber in the injection machine at the same time the process of dispersing in the resin is released twisted. At this time, the increase in the restoring force of the fiber due to the coating of the resin solution inside the fiber makes the twisting more smooth. Heating temperature and time of the injection molding machine can be variously adjusted according to the environment, such as the type of fiber, the type of resin.

When the twisted fibers are injected, the twisted bar is prevented from being entangled with the fibers, and the dispersion force is improved, so that the final dispersion is made of a uniformly reinforced plastic.

As a result, by manufacturing the fiber-reinforced plastic by the manufacturing method as described above, it is possible to prevent the single yarn of the fiber filament as much as possible to improve the quality and productivity of the product, and to prevent the tangling phenomenon due to the smooth dispersion of the fiber. It is possible to obtain a product in which the fibers are evenly dispersed. As a result, the fiber-reinforced plastics produced in this way have a good appearance, do not degrade mechanical properties, and have good impact resistance.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

Claims

Preparing a fiber filament bundle for use in the manufacture of fiber reinforced plastics;
Applying a twist to the bundle of fiber filaments;
An impregnation step of dipping the twisted fiber filament bundle into a resin solution;
Releasing the twist of the impregnated fiber filament bundles again; And
Injecting the fiber filament bundles;
Method for producing a fiber-reinforced plastic comprising a.

The method of claim 1,
Releasing the twist is,
Heating the impregnated fiber filament bundle to remove the coated resin; And
Re-twisting the fiber filament bundle from which the resin has been removed;
Method for producing a fiber-reinforced plastic comprising a.

The method of claim 2,
Removing the coated resin and releasing the kink is made of the fiber reinforced plastics, characterized in that made in one step with the injection step.

The method of claim 1,
The fiber filament is glass fiber, carbon fiber, natural fiber, aramid fiber, rayon fiber, graphite fiber, metal fiber, or a method of producing a fiber-reinforced plastic, characterized in that made of at least one of allylate fibers.

The method of claim 1,
The impregnating step is a method of producing a fiber-reinforced plastic, characterized in that the entry of the resin solution into the interior of the fiber filament bundle is blocked by the twist of the fiber filament bundle.

The method of claim 1,
The injection step, the method of producing a fiber-reinforced plastic, characterized in that the injection of only the fiber filament bundle or the resin is used as the raw material of the fiber filament bundle and fiber reinforced plastic.

After twisting the prepared fiber filament bundle impregnated in a resin solution, the impregnated fiber filament bundle is heated to remove the coated resin and then twisted again to release the twisted fiber, fiber-reinforced plastic formed through the injection process.

The method of claim 7, wherein
Heating the impregnated fiber filament bundle to remove the coated resin and then re-twist the fiber and the injection process is fiber-reinforced plastic, characterized in that made in one injection machine.

The method of claim 7, wherein
The fiber filament is a fiber reinforced plastic, characterized in that made of at least one of glass fiber, carbon fiber, natural fiber, aramid fiber, rayon fiber, graphite fiber, metal fiber, or allylate fiber.

The method of claim 7, wherein
Fiber impregnated plastic, characterized in that the entry of the resin solution into the interior of the fiber filament bundle is blocked while the twisted fiber filament bundle is impregnated.

The method of claim 7, wherein
The injection step is a fiber-reinforced plastic, characterized in that the injection of only the fiber filament bundle or the resin as the raw material of the fiber filament bundle and fiber reinforced plastic.