JPS5967014A - Preparation of long fiber reinforced plastic molded product - Google Patents

Abstract

PURPOSE:To contrive to improve the productivity of plastic molded products by such an arrangement wherein a long strip of intermediate product which has a fixed crosssectional area and is in semihardened condition is continuously formed by a die, and said intermediate base material is cut into piece of specified length and a specified number of cut base material is collected and press-formed. CONSTITUTION:A roving 50 of glass fiber is drawn out from a winder 11 and it is caused to pass through unsaturated polyester resin not hardened yet filled in a resin impregnating tank 12 and the glass fiber is covered with unsaturated polyester resin. The glass fiber roving 51 thus obtained is arranged in one direction and is continuously sent into a heating and forming die 13 and it is semihardened being heated there and an intermediate base material 52 is obtained by drawing out the glass fiber. The intermediate base material 52 is cut into pieces of 30cm in length and 2 pieces are laminated and placed in the cavity of a metal mold. The metal mold is heated and pressurized for 30min under such conditions as 150 deg.C and 20kg/cm<2>, and a molded product such as a glass fiber reinforced plastic molded product of which fiber content is 60vol% is obtained. The bending strength and bending elasticity of the molded product thus formed are very excellent such as 120kg/mm.<2> and 4X10<3>kg/mm.<2> respectively when dried and 90kg/mm.<2> and 2.5X10<3>kg/mm.<2> respectively when wet.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an f% fiber-reinforced plastic molded article.

Long! Ili II (E-reinforced plastic is a composite material made by reinforcing the strength, rigidity, etc. of Plus Snack with long fibers. It has a structure in which long fibers, which are a dispersion material, are embedded and fixed within Plus Book, which is a base material. In recent years, it has attracted attention as a lightweight ft1 material with excellent properties such as strength.

Conventionally, such long fiber-reinforced plastic deck molded products have been manufactured by press molding, pultrusion, or the like.

The press forming method is a process in which a large number of long fibers are collected and spun.
After the pin is impregnated with thermosetting resin, it is pulled together to form a sheet-shaped intermediate material called prepreg, and the required number of prepregs are laminated and pressed in a mold to form a predetermined shape. This is a method of manufacturing shaped products. However, the thickness of the prepreg is 0. Because it has a culm degree of 1 to 0.2 mm,
In order to produce the desired molded product, a large number of sheets of prepreg are generally required to be laminated to create a 1LJ 't'l, which limits productivity. Release paper and the like are required, and furthermore, it is very difficult to store and manage the prepreg because it is attached to the prepreg.

Pultrusion molding method LJ: , a large number of long fibers are collected and spun
1- After impregnating the hinge with thermosetting resin, it is arranged in one direction and passed continuously through a die with a constant cross-sectional shape, and the curing reaction is completed in the die to form a long length with a constant vessel shape. [Manufactured by continuously taking out shaped products from a die]
This is a method of informing the public. Although this method has better productivity than the press molding method, it has the disadvantage that it is not possible to produce molded products with variable cross-sectional shapes because the cross-sectional shape of the product depends on the cross-sectional shape of the die and varies. has.

The present invention has been devised to address these drawbacks of conventional manufacturing methods, and provides a manufacturing method that is highly productive and capable of manufacturing products with non-uniform cross-sectional shapes.

That is, the manufacturing method of the 8B IC reinforced plastic molded product of the present invention involves the steps of continuously manufacturing a semi-hardened elongated intermediate product with a constant cross section using a die; After cutting the intermediate rope 4A to a predetermined length, the cutting I,
This method is characterized in that it consists of a step of press-molding one or a predetermined number of intermediate rope materials to produce a molded product of a predetermined shape.

The process of manufacturing intermediate cable material +, +: The outer peripheral surface of a large number of long fibers is coated with an uncured thermosetting resin, and this is coated in one direction (
, After arranging, the material is continuously passed through a die having a constant cross-sectional shape, heated etc. in the die to proceed with the curing reaction at step 31 to a semi-cured state, and then continuously taken out from the die to form an intermediate material. 1! -7 steps.

In the press molding process, after cutting the semi-hardened intermediate rope material to the length required for the product, the cut intermediate rope materials are stacked one at a time or in the number required for the product in a mold. Alternatively, it is a process of arranging the molded products and heating them in the mold to complete the curing reaction to produce a molded product of a desired shape.

Good sense! (As mentioned above, 1 is 1 part of common sense reinforced plastic) It has the function of improving the rigidity etc. of the long fiber reinforced plastic deck as a reinforcing material. The type of long fibers to be used can be selected depending on the intended use of the string-reinforced plastic molded product. For example, carbon fiber shoulder 1, boron fiber 1I
-It, silicon carbide shoulder 1, alumina fiber attached,
Silica fibers, highly oriented polymer fibers, glass UJi strings, etc. can be used. Highly oriented polymer-r'sa si totit, Tatoeha-N l-1-C>-N l-I C
It is a fiber known as Kevlar (trade name), designated O-Q-C〇-. Note that two or more types of long fibers may be used together.

The thermosetting resin is the main phase in which the long fibers are embedded. The thermosetting resin can also be selected depending on the use of the long fiber reinforced plastic molded product.

For example, epoxy resin, unsaturated polyester resin, -
Norm resin, vinyl Nisder resin, allyl resin, etc. can be used.

Six methods for continuously coating long fibers with an uncured thermosetting resin include, for example, continuously coating long fibers guided with a knife roll or the like into an uncured thermosetting resin filled in an impregnation tank. There is a way to dive into it. In addition, after this, long fibers (
, jl, followed by sword id [J-ru etc. arranged in one direction l
) with roving and quisling.

In order to heat the thermosetting resin in the die to a semi-hardened state, the heating temperature and heating time are controlled.

Moreover, it can also be brought into a semi-cured state by electron beam irradiation. In this case, a semi-hardened intermediate material can be obtained by controlling the irradiation intensity and irradiation time.

After being brought into a semi-hardened state in this way, it is continuously taken out from the quiz to obtain a long intermediate material with a constant cross section.

The intermediate rope material may be subsequently sent to a press forming process, or may be stored as is as an intermediate material.

In the press forming process, after cutting the intermediate rope material to a predetermined length,
The cut intermediate materials are stacked and arranged singly or in a required number, and heated and pressurized in a mold to complete the curing reaction, thereby obtaining a plastic molded product reinforced with plastic strings in a predetermined shape. A5, it is reinforced only in one direction by the intermediate material (Yu-sense shoulder), but it is press-molded ■A3 on the culm,
(Thus, it is possible to make a molded product strengthened in 41 directions by 1!7).

The manufacturing method of the present invention has the following disadvantages compared to the conventional manufacturing method.

First, productivity is excellent. Since the intermediate material has a relatively large shape, it is not necessary to stack or arrange a large number of layers during press molding. If the size of the desired molded product substantially matches the size of the intermediate material, the intermediate material alone may be sufficient. Moreover, the intermediate cord io can be continuously separated by 1 q from the long fibers.

Second, it is easy to preserve the intermediate cord Δ. That is, since the intermediate material is in a semi-hardened state, it has no fluidity and is not sticky. Therefore, they can be stacked and stored without using release paper or the like, and they are easy to handle.

Thirdly, when press-molding with a mold using at least one cut intermediate rope 4Δ, J when laminating prepreg,
1. Problems such as peeling of molded products do not occur.

Hereinafter, the present invention will be specifically explained based on examples.

Figure 1 is a schematic diagram of the intermediate mold manufacturing device used for manufacturing the intermediate material in the following examples, and Figure 2 is a schematic diagram of the mold used for press forming the intermediate material. A certain 3° intermediate roving machine 151J has a take-up roll 11 for winding a long fiber roving, and a resin impregnation roll 11 containing uncured resin, which is arranged sequentially in the right direction, that is, in the direction of the long fiber roving. It consists of a tank 12, a thermoforming die 13, and a take-off device 14.The resin impregnation tank 12 is equipped with a guide roll 121 that guides the long fiber opening pulled out from the take-up roll 11. 1. The hot molding die 13 is equipped with a melon control system.

The gold 31 consists of an upper mold 21, a lower mold 22, etc., and is equipped with heating and pressurizing means.

First example The present invention was implemented using the following procedure.

(1) Direct? A glass fiber of 17 yen/1 m was made into a roving and let into a winding device 11.

(2) Glass fiber roving 50 from the winding device 11
is pulled out, and the resin-impregnated layer 1 is pulled out by the guide roll 121.
The glass fibers were coated with the unsaturated polyester resin by dipping the glass fibers into an uncured unsaturated polyester resin filled to a volume of 2.

(3) Glass 48 coated with unsaturated polyester resin
If rovings 51 were arranged on one side and passed continuously through the thermoforming die 13.

(4) The roving 51 is molded into one piece in the heat forming die 13.
The advancing speed of the roving 51 was controlled by the pulling device 14, which was heated to 00''C and the same portion of the roving 51 remained in the heat forming die 13 for 20 minutes. The cross-sectional shape is circular, and the cross-sectional area is 78°5 mm2.

(5) In this way, the unsaturated polyester resin was brought into a semi-cured state within the thermoforming die 13, and was continuously drawn out from the thermoforming die 13 using the drawing device 14 to obtain an intermediate material 52.

(6) The intermediate material 52 was cut into a length of 3 qcm, which was laminated for two times and stored in the cavity of a mold.

(7) Heat and pressurize the mold at 150°C 201u+/cm2 for 3q minutes to obtain a glass fiber reinforced plastic molded product with a fiber content of (3Qvo1%).

The bending strength and bending elastic modulus of the molded product manufactured in this way are 120 kg/mm when dry. , 4 x 103 k(+/
mm2, wet tl'/1 hour r90kQ/mm2.2.5x
103 kg/mm2 (obtained).

Second Embodiment The second embodiment is also substantially the same as the first embodiment. The difference between the second embodiment and the '11 embodiment is that the long fibers have a diameter of 8 μm.
1 Carbon All11 navy blue was used, and as the thermosetting resin, 'Evoi resin' was used. In the second embodiment, the heating temperature of the thermoforming die 13 was 1°0°C, and the heating time was 2°C.
0 minutes, the heating temperature in the mold was 170℃, and the pressure was 2
0 kg/cm2, heating and pressurizing time was 100 minutes.

The bending strength and bending modulus (well,
Dry: 150kg/nv2.12x 103kg/
mnl 2, ? ! i! lI′Ij n3 at 1 2 0 kq/mm 2 , 9 x 1
031 (Q/'mm2 was closed.

The present invention is suitable for pultrusion molding from long fibers.
This is a method for manufacturing a reinforced plastic molded product made of high fiber shoulder 1, consisting of a culm in which a green-hardened intermediate base is continuously produced using a culm, and an I culm in which the intermediate base is press-molded.

As explained in detail in Example 1), it is clear that the manufacturing method of the present invention is suitable for J'
This is an optimal manufacturing method for manufacturing Lh-shaped molded products, such as wiper arms, blade fittings, etc., with high productivity. Moreover, the strength, rigidity, etc. of the molded products manufactured by the method of the present invention are found to be IC.

[Brief explanation of drawings]

Fig. 1 (schematic diagram of intermediate accumulative production equipment), Fig. 2 (schematic diagram of 1 mold) 11... Winding roll 12... Resin impregnation tank 1
3... Heat molding die 14... Taking-off device 21
...l l:I 22...lower mold 50...
・Textile roving in 1 52... Intermediate material patent applicant Nippondenso Co., Ltd. agent Patent attorney required Koji Ben JIP attorney Sakudo Fujitani Patent attorney Akio Maruyama

Claims (2)

[Claims] (1) Coat the outer peripheral surface of a large number of long fibers with uncured thermosetting resin, arrange them in one direction, pass them continuously through a die with a constant cross-section, and proceed with a curing reaction in the die to semi-cure. The process involves continuously manufacturing a long intermediate material with a constant cross section, cutting the intermediate material into a predetermined length, inserting it into a mold, or stacking or arranging a predetermined number of pieces. A method for producing a long fiber-reinforced plastic molded article, comprising the steps of: heating in the mold to complete the curing reaction. (2) The long fibers are carbon fibers, boron fibers, Series 1
The thermosetting resin is one or more of carbon carbide l1ff, alumina fiber, silica fiber, highly oriented polymer fiber, and glass fiber, and the thermosetting resin is EVO:1 resin, unsaturated poly 1-stell resin. The method for producing a fiber-reinforced plastic molded article according to claim 1, which is one of phenol resin, vinyl ester resin, and allyl resin.