JPH0138668B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention is a material for forming coated FRP products, particularly a continuous core made by impregnating reinforcing fibers with an uncured thermosetting resin, and an outer layer made of a thermoplastic resin. related to things.

For example, when a rod-shaped or string-shaped object is formed using fiber-reinforced resin (hereinafter referred to as F or RP), the surface of the FRP is usually coated with a suitable thermoplastic resin. Furthermore, the thermoplastic resin is selected to adhere to the thermosetting resin of the core. This results in a coating with excellent mechanical strength properties that integrates the core and its outer coating layer.
You can get FRP products. By the way, such coated FRP products, as shown in Figure 1,
A material 10 for forming an FRP product is constructed by providing an outer covering layer 14 made of a thermoplastic resin on a continuous core 12 made of reinforcing fibers impregnated with an uncured thermosetting resin. After shaping into a desired shape such as a coil shape, the thermosetting resin in the core body 12 is heated and hardened to fix the shaped shape, thereby producing the final coated FRP product. . This invention covers such coated FRP
The present invention relates to a material 10 for forming a product.

By the way, as shown in FIG. 1, the conventional material for forming coated FRP products of this type is one in which a core body 12 impregnated with a thermosetting resin is provided with an outer covering layer 14 made of a thermoplastic resin. be. Outer coating layer 1
The thermoplastic resin 4 is selected to adhere to the thermosetting resin of the core body 12. A combination of resins is selected so that they have a so-called chemical affinity for each other and the core body 12 and the outer covering layer 14 are bonded to each other and integrated as a final product. However, there are very few types of combinations of thermosetting resins and thermoplastic resins that can be bonded together due to their chemical affinity with each other. Even if it is desired to use the thermosetting resin of the core body 12, these resins cannot be bonded because they do not have chemical affinity with the thermosetting resin of the core body 12. Therefore, the core body 12 and the outer covering layer 14 are not integrated coating with excellent mechanical strength properties
It was not possible to form FRP products. FRP
The typical resin used for this is unsaturated polyester, but suitable thermoplastic resins for the outer covering layer 14 that have chemical affinity for unsaturated polyester include ABS resin or some low-carbon resins. It only had a melting point of thermoplastic resin. For example, adhesive polyethylene can be bonded to the thermosetting resin, but since its melting point is lower than the curing temperature of the thermosetting resin, the outer covering layer 14 of the covered FRP product forming material 10 described above
It cannot be used for In this way, the conventional coated FRP product forming material 10 has a coating outer layer 1.
The selection range of the thermoplastic resin No. 4 is extremely limited, and for example, thermoplastic resins such as nylon, PP, and PE cannot be used. In addition, ABS resin as the conventional covering outer layer 14 is
It is possible to bond to the unsaturated polyester as the thermosetting resin used for the core body 12 by having a chemical affinity for it. Another problem was that it was gradually attacked by the monomer. This type of material 10 for forming double-covered FRP products has a very wide range of processing uses, such as strands of rope, and therefore the material itself has marketability. However, in the material 10 using the conventional ABS resin as the outer coating layer 14, the ABS resin of the outer coating layer 14 is converted to the thermosetting resin in the core body 12 while being distributed on the market or during the inventory period. This made it very difficult to put it into distribution channels.

This invention was made in view of the above-mentioned conventional problems, and its purpose is to expand the range of usable resin combinations, especially the selection range of thermoplastic resins used for the outer coating layer, compared to the past. It can be expanded significantly, which allows for example nylon,
In addition to making it possible to use resins such as PP and PE as the outer covering layer, it also ensures sufficient adhesive strength between the outer covering layer and the core, thereby integrating the core and the outer covering layer. It is possible to form coated FRP products with sufficient mechanical strength characteristics, and furthermore, it is possible to use thermoplastic resin as the outer layer of the coating, which is not attacked by the thermosetting resin in the core, making it possible to distribute it as a material product. Covering that can be placed on routes
Our goal is to provide materials for forming FRP products.

In order to achieve the above object, the present invention includes a continuous linear core made of reinforcing fibers impregnated with an uncured thermosetting resin, and a thermoplastic resin that seamlessly covers the outer periphery of the core in an annular shape. It consists of an outer layer made of resin, and an intermediate layer interposed annularly between the core body and the outer layer, straddling and contacting both to form an adhesive layer, which is shaped before the thermosetting resin is cured. The thermoplastic resin of the outer layer has a heat deformation temperature higher than the curing temperature of the thermosetting resin of the core, and the thermoplastic resin of the intermediate layer has a thermosetting temperature higher than that of the thermosetting resin of the core. It is characterized by having a softening temperature or melting point lower than the curing temperature of the polyester resin.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. Note that the same or corresponding parts in each figure are indicated using the same reference numerals.

Figure 2 A, B, C, and D are coatings according to the present invention.
An example of a material 10 for forming an FRP product and an example of its secondary processing are shown. First, the material 10 shown in A and D of the figure includes a core 12, an outer layer 14 covering the core 12, and a material 10 interposed between the core 12 and the outer layer 14 so as to straddle and contact them. and an intermediate layer 18 that forms an adhesive layer. The core body 12 has a continuous shape and is made by impregnating reinforcing fibers such as continuous glass fibers with an uncured thermosetting resin. Examples of the thermosetting resin used here include unsaturated polyester. Also,
The outer coating 14 has a heat deformation temperature higher than the curing temperature of the thermosetting resin, and can be made of, for example, nylon, PP, PE, or the like. Traditional
Of course, ABS can also be used. The intermediate layer 18 is made of a thermoplastic resin, and this thermoplastic resin has a softening temperature or melting point lower than the curing temperature of the thermosetting resin, so that it becomes fluid when the thermosetting resin is cured. contact,
Thereby, a material is used that can be bonded to the thermosetting resin and also to the thermoplastic resin of the outer covering layer 14. An example of such a thermoplastic resin is adhesive polyethylene. This adhesive polyethylene has a softening temperature lower than the thermosetting temperature of, for example, unsaturated polyester and can be bonded to the resin, and the outer covering layer 14 can be made of nylon, PP, PE, etc.
It can also be bonded to thermoplastic resins such as. In this case, the resin of the intermediate layer 18 and the outer coating layer 14
The core body 12 is coated with the resin at the same time by coextrusion using an extruder, and they are bonded to each other and integrated during this coextrusion. In addition, the adhesion between the intermediate layer 14 and the thermosetting resin in the core body 12 is performed using the material 10.
This is carried out as the thermosetting resin is thermally cured by secondary processing.

Now, the continuous-shaped coated FRP product forming material 10 having the above-described configuration is formed into a desired shape, such as a coil shape, as shown in FIG. 2B. After the shape has been formed, the thermosetting resin of the core body 12 is cured by heating at a temperature below the deformation temperature of the thermoplastic resin of the outer covering layer 14. At this time, the intermediate layer 18 is once in a molten state due to curing heating, but is cooled and solidified as the thermosetting resin of the core body 12 is completed, and as a result, the intermediate layer 18 is formed between the core body 12 and the outer layer 14. are bonded together by the anchor effect, and finally adhered and integrated with the thermosetting resin of the core body 12. This fixes the shaped shape as shown in FIG. 2C. In the manner described above, it is also possible to form, for example, a rope-like shape or a net-like shape. As mentioned above, the coated FRP product that has been bonded and integrated in this way has greatly improved mechanical strength characteristics. What should be noted here is that the thermoplastic resin of the outer covering layer 14 does not need to be directly bonded to the thermosetting resin of the core body 12, so the type of thermoplastic resin is limited to an extremely narrow range as in the past. For example, in addition to ABS, thermoplastic resins such as nylon, PP, and PE can be used. Therefore, its range of applications has expanded greatly, and it has also expanded to include nylon, PP,
Since it is possible to use a resin such as PE that is not corroded by the thermosetting resin in the core body 12, the material 10 can be stored stably for a long period of time, which allows it to be used in the market distribution channel. It will also be possible to transport the products and deliver them to secondary processors.

It goes without saying that the thermosetting resin of the core body 12 may be other than unsaturated polyester. The thermoplastic resin of the intermediate layer 18 is also
In addition to adhesive polyethylene, for example, an EVA-based hot melt adhesive can be used.
Here, for example, the core body 12 is made of unsaturated polyester,
When nylon is used for the outer coating layer 14 and adhesive polyethylene is used for the intermediate layer 18, the intermediate layer 18 and the core 1
Adhesive strengths of 5 to 10 kg/inch or more could be obtained between the intermediate layer 18 and the outer covering layer 14, respectively.

As described above, the coated FRP product forming material according to the present invention provides an intermediate layer between the outer coating layer and the core body, and this intermediate layer spans and adheres to both the core body and the outer coating layer. The range of choices for the outer covering layer can be expanded to a greater extent than before, and for example, thermoplastic resins such as nylon, PP, and PE can be used. This greatly expands the range of its application, and also allows the use of a thermoplastic resin for the outer coating layer that is not corroded by the thermosetting resin of the core.
It can also be stored stably for a long period of time, allowing it to be distributed in the market.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an example of a conventional material for forming covered FRP products, and Figs. Figure D is a cross-sectional view taken along the line AA in Figure A. 10...Material for forming coated FRP products, 12...
Core body, 14... Outer covering layer, 16... Covering FRP product, 18... Intermediate layer.

Claims (1)

[Claims] 1. A continuous linear core made of reinforcing fibers impregnated with an uncured thermosetting resin, an outer layer made of a thermoplastic resin that seamlessly covers the outer periphery of the core, and the core and the outer layer. and an intermediate layer that is interposed in an annular shape between the two to form an adhesive layer by contacting the two, and is shaped before the thermosetting resin is cured, and the thermoplastic resin of the outer layer The resin has a heat distortion temperature higher than the curing temperature of the thermosetting resin of the core, and the thermoplastic resin of the intermediate layer has a softening temperature or melting point lower than the curing temperature of the thermosetting resin of the core. A material for forming coated FRP products characterized by having the following properties: