JPS6218431A - Fiber-reinforced resin automobile body material - Google Patents

Abstract

PURPOSE:The titled automobile body material excellent in flexibility and impact resistance and low in molding and processing cost, comprising a specified base resin and a glass fiber. CONSTITUTION:An FRP board is obtained from a mixture of a base resin comprising an unsaturated polyester having an average MW, per double bond, of 600-1,000 and a number-average MW of 1,500-2,000 and 10-20wt% chopped glass strand mat 4. A surfacing mat 3 is laminated on at least either surface of this FRP board and a gel coat layer 2 comprising an unsaturated polyester 5, colloidal silica and, optionally, a pigment is formed on the surface layer or layers to obtain a fiberreinforced resin automobile body material 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a body material for automobiles and the like made of fiber-reinforced resin.

(Prior art) Steel plates are usually used as the material for the outer panels of automobile bodies.
However, in the case of cars that are only produced in very small quantities, such as luxury sports cars, limited production cars for rallies, and exhibition cars for motor shows, it is possible to quantify them or have a large degree of freedom in shape. Fiber-reinforced resin (hereinafter referred to as F
A non-drip product (denoted as RP) has traditionally been used. In addition, in recent years, 6R-RIM (reinforced reaction injection molding) has been applied to parts below the vehicle belt line, such as bumpers, fenders, doors, and rocker panels, for the purpose of protecting pedestrians and improving damage resistance in minor collisions. ) - There is a tendency to use highly flexible materials such as polyurethane, thermoplastic resins, polycarbonate/ABC resins, etc.

(Problems to be Solved by the Invention) However, the currently used FRP produced by the hand layup method usually has a molecular weight per double bond of 150 to 400 for reasons such as lamination workability.
Unsaturated polyester with a number average molecular weight in the range of 1,500 to 2,000 is used, but in general, the molecular weight at the double bond is small and the root skin reactivity is high, resulting in a hard base material. is small and less flexible, so #
Impact resistance decreases. Therefore, the conventional F-P is sufficient in terms of strength such as tensile strength and bending strength, but the flexibility and r
As for impact resistance, some molded products do not meet market requirements, so products with even better flexibility and impact resistance are desired.

R-IM-In the case of polyurethane or thermoplastic resin,
The hand lay-up method for FkLP is m-pressure molding, which uses an inexpensive single-sided resin mold, whereas this material requires expensive molds and molding machines, making it especially difficult for small-volume production vehicles. In some cases, increased costs become a problem. Therefore, the present invention is highly flexible and has low molding cost.
The aim is to provide all car body materials made of P.

(Means for Solving the Problems) In order to couple the above objects, the F-P car body material of the present invention uses an unsaturated resin having an average molecular weight of 600 to 1000 per double bond of 11 vA as a base resin. It is characterized by using polyester and having a glass fiber content of 20 to 20%.

The unsaturated polyester used in the ILP material of the present invention has an average molecular weight per double bond of 600 to 1.
000, and the number average molecular weight is preferably 1500-2
It is 000. Number average molecular weight is correlated with resin viscosity,
A viscosity within the range of 1500 to 2000 may be selected to obtain a suitable viscosity (2 to 10 voids) for good lamination workability, but is not limited thereto.

More specifically, the unsaturated polyester used in the present invention includes saturated basic acids such as phthalic acid, phthalic anhydride, isophthalic acid, and terephthalic acid, as well as maleic anhydride, maleic acid, fumaric acid, mesaconic acid, and tetraconic acid. unsaturated radical acids and ethylene glycol, diethylene glycol,
It is obtained by reaction with alcohols such as propylene glycol, diethylene glycol, phtylene gelylcol, neopentyl glycol, and hydrogenated bisphenol A.

These unsaturated polyesters (alkyd resins) are dissolved in styrene monomer by a conventional method to prepare a polyester resin composition.

The physical properties of the cured cast products of the unsaturated polyester of the present invention and conventionally used unsaturated polyesters are shown in Table 1 below.

Table 1 The fiber-reinforced side fat material of the present invention may have a gel coat layer entirely formed on its surface layer, consisting of, for example, unsaturated polyester, colloidal silica, and optionally pigment, and the unsaturated polyester used for this gel coat The above-mentioned unsaturated polyesters having a molecular weight per double bond of 600 to 1000 and a number average molecular weight of 1500 to 2000 are preferred, but other unsaturated polyesters can also be used.

Various types of mats, rovings, and cloths are used as the glass fibers, but mats, especially glass chopped strand mats, are selected in consideration of strength, cost, etc. If desired, use an ace mat on one or both surfaces to improve the smoothness of the molded surface and prevent exposure of the glass fibers, as well as to prevent the resin from sagging during curing. You can. The glass fiber content is selected within the range of 10 to 20 weight. If the content is less than that, the heat resistance will be low and it will not be able to withstand the paint baking temperature (SO°C), and if it is more than that, the rigidity will increase and the desired flexibility will not be obtained.

As the additive, curing accelerators, fillers, etc. that are conventionally used in this type of field can be used, depending on the intended use and molding method of the molded product obtained.

The car body material of the present invention can be formed by, for example, a hand lay-up method, a vacuum bag method, a pressurized bag method, an autolape method, a spray-up method, a resin injection method, a cold press method, or the like. .

(Function) The car body material of the present invention uses unsaturated polyester having a molecular weight per double bond of 600 to 1000 as the base resin, and glass fiber is added to this so that the content thereof is 10 to 20%. When used as a car body material, it exhibits optical flexibility and markedly improved impact resistance.

(Example) Hereinafter, the present invention will be explained in more detail with reference to all embodiments.

The figure shows a cross-sectional view of one embodiment of the FkLP board 1 according to the present invention. The method for manufacturing the F' RP board is shown below.

First, a gel coat 2 consisting of 100 parts of the unsaturated polyester according to the present invention, 4 to 10 parts of titanium white as a pigment, and 1 to 3 m of Aerosil as an anti-sagging agent.
is applied to a thickness of 0.2 to 0.6 mm on a substrate fully coated with mold release agent FE. When the gel coat is semi-cured, apply Glass Surfacing Mat 3 (basis weight 30) on top of gel coat 2.
~50 f/m") t-2 layer (2p13') is set, and on this mat 3, the unsaturated polyester 5 according to the present invention is applied.
impregnated and laminated. Next, a glass chopped strand mat 4 (basis weight 200 to 450 f
Am") f 2 ply [Ii'ij L, similarly vc m Ul k impregnate. More specifically +4
50 pine) is used. Finally, apply the Surfacing Mat 3 on the strand mat 4 by applying 2 pty 1 ring and impregnating the 4 fingers in the same manner. The thickness of the obtained J”HP plate was 3 to 4
1, and its physical properties were tested. Result 2 Table below-
Shown in 2.

Table-2 *1)' A steel ball of 0.5 Kf is placed on P at a height of 10 cs.
Drop it in small increments and determine the impact strength from the height at which cracks occur.

(Effects of the Invention) The FRP4fl car body material according to the present invention can be manufactured with the workability and manufacturing cost of conventional FRP car lumber body materials, and is much more flexible than the conventional Fl (P back car body material). , 几-81M shows almost the same flexibility as polyurethane and thermoplastic resin;
In addition, the FhP board according to the present invention has heat resistance equivalent to and better than the polyurethane and resin described above.
It has excellent dimensional stability.

The FILP material according to the present invention was applied to the pan bars, fenders, and rocker panels of automobiles, and as a result of evaluating impact resistance, etc., it was confirmed that the material had sufficient performance for practical use.

[Brief explanation of the drawing]

The figure is an enlarged sectional view of an RP board according to an embodiment of the present invention. 1.-F RP board 2...Gel coat 3...Surface mat 4...Glass chopped strand mat 5...Unsaturated polyester Patent applicant Toyota Motor Corporation Kokuo Uchihama Kogyo Co., Ltd.

Claims (1)

[Claims] As the base resin, the average molecular weight per double bond is 6.
A soft fiber-reinforced resin car body material characterized by using unsaturated polyester having a molecular weight of 00 to 1000 and having a glass fiber content of 10 to 20% by weight.