JP2002144340A - Cut piece for fiber reinforced plastic, fiber reinforced plastic using the piece and methods for manufacturing both - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide available application of resource, while a means for lightening an environmental load is provided, by utilizing recycling target fiber processed goods of a high order as raw material for reinforced plastics though the recycling target fiber processed goods of a high order has a bad effect as industrial waste on environment since a method for incinerating or disposing is adopted after use. SOLUTION: A method for manufacturing a fiber reinforced plastic is provided wherein a cut piece for fiber-reinforced plastic provided by treating the recycling target fiber processed goods of a high order by resin; fiber reinforced plastic containing the recycling target fiber processed goods of a high order as reinforcing material; and cut pieces for the fiber reinforced plastic are mixed in a thermoplastic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to obtain a fiber-reinforced plastic by effectively utilizing a high-order processed fiber product to be recycled.

[0002]

2. Description of the Related Art Conventionally, high-process fiber products have been incinerated or discarded after use. However, the method of incineration and disposal may have an impact on the environment. When thinking about environmental issues these days,
The treatment and effective use of these industrial wastes has become a very large social problem. On the other hand, glass fiber, carbon fiber,
Mixing aramid fiber or the like with resin to obtain fiber reinforced plastics (FRP) is very generally known. This reinforced plastics
It is well known that it is used in a wide range of fields such as space, architecture, ships, automobiles, vehicles, tanks, industrial materials for containers, etc., and is expanding its application fields in the future.

[0003] Therefore, it can be said that it would be extremely significant from the viewpoint of effective use of resources and the environment if a higher-order processed fiber product to be recycled can be effectively used as a material of the fiber-reinforced plastics.

In this regard, Japanese Patent Laid-Open Publication No. Hei 7-132562
Japanese Patent Laid-Open Publication No. HEI 9-176566 describes that chips produced from waste fiber-reinforced plastics are added to produce FRP chip-reinforced plastics. However, according to this method, the waste is chips produced from fiber reinforced plastics, and unlike the present invention, which is waste of fiber products, the convergence is insufficient because the resin is not processed. Therefore, when mixing with a thermoplastic resin and performing injection molding, it is difficult to adjust the fiber content to a target value due to extremely poor mixing of the cut pieces and the thermoplastic resin pellets. There was a problem that the target physical properties of reinforced plastics could not be reached. Further, even if it is forcibly adjusted, since the fiber content cannot be kept constant, there is a problem that physical properties of a reinforced plastic product of a thermoplastic resin as a final product may vary.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to an industrial waste by incinerating and discarding a fiber-modified advanced product by effectively utilizing the fiber-modified product to be recycled to obtain fiber-reinforced plastics. It is intended to solve environmental problems of goods.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fiber reinforced plastic cut piece obtained by resin-treating a high-order processed fiber product to be recycled and a method for producing the high-order processed fiber product. The present invention is achieved by a method for producing fiber reinforced plastics containing a fiber cut piece as a reinforcing material and a method for mixing the fiber cut piece for a fiber reinforced plastic with a thermoplastic resin.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

The fibers in the high-processed products to be recycled according to the present invention include fibers such as wholly aromatic polyamide, carbon fiber, glass fiber, polyparaphenylene benzobisoxazole fiber (PBO), aromatic polyester fiber, and polyvinyl alcohol fiber. Fiber. Higher-processed products are ply yarns, twisted yarns, knitted fabrics, woven fabrics and final products composed of them.

[0009] The object of recycling is a used product of the above-mentioned high-order processed product, but a defective product generated when manufacturing the high-order processed product is also included in the recycling target. When the high-order processed product is contaminated by use, the impurities are washed and removed with water or an organic solvent in advance as appropriate. In order to improve the convergence, the resin that processes the high-order processed product is a resin that can be dissolved or dispersed in a solvent, such as nylon, polyester, polycarbonate, polyurethane, epoxy resin, polyphenol, polyisocyanate, and urea resin. Is mentioned. The resin used here is a thermoplastic resin to be mixed, that is,
A resin that is similar or compatible with the thermoplastic resin as the matrix should be selected. If a resin that is incompatible or poorly compatible with the thermoplastic resin as the matrix is selected, the dispersibility of the fibers in the resulting reinforced plastics will deteriorate, and a product with uniform physical properties cannot be obtained. There is. For example, when the thermoplastic resin as the matrix is nylon, as the resin used for the treatment, nylon soluble in water or methanol,
Water-soluble or dispersible polyurethanes, polyisocyanates, urea resins and the like are selected. Here, as a method of treating the resin, a method of mainly melting the above-described resin and applying it to a high-level processed fiber product to be recycled, or a method of dissolving the resin in an aqueous or organic solvent to produce a high-level processed fiber product to be recycled Is provided. Examples of the organic solvent include alcohols, ketones, acetates, and the like.

The resin content in the cut piece for improving the sizing agent for the high-order processed product to be recycled is as follows:
The range is from 0.1 to 30% by weight, preferably from 1 to 15% by weight. The thermoplastic resin used as the matrix resin is determined according to the application used as the reinforced plastics, but is selected from nylon, polyester, polycarbonate, ABS resin, polyphenylene sulfide (PES), polyetheretherketone (PEEK), and polyetherketone. Ketone (PEK
K) and the like.

The size of the cut piece of the reinforced plastic cut piece obtained by resin-treating a high-order processed product of the fiber to be recycled depends on the dispersibility with the thermoplastic resin as the matrix and the fiber length required as the reinforcing material. From 10m
m is preferable. For this reason, it is preferable that the shape of the higher-order processed fiber product to be recycled be treated with a resin and cut into a sheet shape in order to obtain a uniform cut piece.

[0012] The fiber content in the final fiber reinforced plastic is determined by the purpose of the final product.
-50% by weight, preferably 10-40% by weight.

[0013] As a method for producing fiber-reinforced plastics by mixing a high-processed fiber product to be recycled obtained by subjecting the high-processed fiber product to be recycled obtained by the present invention to resin treatment with a thermoplastic resin, direct injection Generally, a molding method or a method of kneading and extruding with an extruder to produce pellets and injection molding the pellets is used.
In addition, the reinforced plastics of the present invention are more effective than conventional fiber reinforced plastics in that they not only have the advantages of effective use of resources and do not require waste treatment, but also are effective in reducing prices.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to embodiments. In addition, the measuring method in the Example used the following method. A. Mechanical properties: Tensile strength according to ASTM D-638 for dumbbell specimens obtained by injection molding,
The elastic modulus was measured. B. Sliding characteristics: Using a test piece obtained by injection molding, the mating material was a steel material (S45C), and the friction coefficient was measured. The lower the coefficient of friction, the better the wear resistance.

Example 1 Used working gloves made of aramid fiber were washed with a detergent and then centrifugally dehydrated. This was immersed in a 20% polyurethane water emulsion, centrifugally dehydrated, and dried at 150 ° C. for 1 hour to obtain gloves having a resin content of about 10%. The resin-treated collected gloves were crushed by crushing to obtain crushed pieces each having a side of about 3 mm. 25% crushed pieces and 75 nylon 66 pellets
%, Kneaded with an extruder, extruded, and cut to about 3 mm.
2.5% by weight of pellets were obtained. The pellets were again supplied to an injection molding machine and extruded into a mold to obtain a molded product.
The characteristic values of the molded product are as shown in Table 1.

Example 2 A used working glove made of aramid fiber was washed with a detergent and then centrifugally dehydrated. This was immersed in a 20% aqueous solution of nylon resin, centrifugally dehydrated and dried at 20 ° C. for 1 hour to obtain gloves having a resin content of about 10%. This was pelletized by the same method as in Example 1, and the characteristic values of the molded product injected are as shown in Table 1.

REFERENCE EXAMPLE Nylon 66 resin is applied to aramid filament fiber, which is a normal product, by melting at 20% by weight based on the fiber.
m. Table 1 shows the characteristic values of a molded product obtained by injecting this with the nylon 66 resin in the same manner as in Example 1.

Comparative Example 1 Table 1 shows the characteristic values of a molded product obtained by injecting only nylon 66 resin without mixing a fiber product to be recycled in the same manner as in Example 1.

[0019]

[Table 1]

[0020]

According to the present invention, a fiber-reinforced plastic is obtained by mixing a fiber-reinforced plastic cut piece obtained by resin-treating a fiber-modified plastic processed product of the present invention with a thermoplastic resin to obtain a fiber-modified plastic processed product. It can solve the environmental problem of industrial waste caused by incineration and disposal, and can obtain good fiber reinforced plastic.

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) C08L 87:00 C08L 87:00 F term (reference) 4F072 AB04 AB05 AB06 AB09 AB10 AD20 AD23 AD37 AD41 AD43 AD44 AJ24 AK15 4F201 AA30 AA50 AD16 BA02 BC01 BC02 BC10 BC11 BC13 BC17 BC25 BD04 BL06 BM05 BN31 BN44 4F301 AA22 AA23 AA24 AA25 AA26 AA27 AA29 AA30 AB03 BD05 BD42 BD48 BE22 BE30 BE31 BE32 BF12 BF27 BF29 BF32

Claims (4)

[Claims] 1. A fiber-reinforced plastic cut piece obtained by resin-treating a high-level processed fiber product to be recycled. 2. A method for producing a cut piece for fiber reinforced plastic, which comprises subjecting a high-level processed fiber product to be recycled to resin treatment, drying and cutting. 3. A fiber reinforced plastic containing a fiber cut piece of a high-level processed fiber product to be recycled as a reinforcing material. 4. A fiber-reinforced plastic cut piece, wherein the fiber-modified processed product according to claim 1, 2, or 3 is a fiber-modified product composed of para-based wholly aromatic polyamide. And fiber-reinforced plastics using the same.