JPH039965A - Fiber-reinforced undercoat - Google Patents

Abstract

PURPOSE:To obtain a fiber-reinforced undercoat improved in chipping resistance by compounding a reinforcing fiber with a resin substrate in a specific ratio. CONSTITUTION:A fiber-reinforced undercoat comprising a resin substrate and 10-30wt.%, based thereon, reinforcing fiber. As the reinforcing fiber functions as a binder for coating film, a high chipping resistance can be attained even for a thin coating film and, further, since the critical film thickness for sagging is large even for a thick coating film, the workability in wet-on-wet coating can be improved. By using the above undercoat, chipping resistance and workability in coating can be improved even in the case of a thin coating film, resulting in the weight reduction of a product by compounding 10-30wt.% reinforcing fiber such as glass fiber or carbon fiber with a resin substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a fiber-reinforced undercoat material designed to improve chipping resistance.

(Prior art) Undercoating materials conventionally used are mainly bituminous undercoats based on asphalt and PvC undercoats based on vinyl chloride resin, and in some cases, undercoats based on urethane resins. However, the chipping resistance of these undercoating materials is highly dependent on the film thickness.

(Problems to be Solved by the Invention) The chipping resistance of conventionally used undercoat materials is highly dependent on film thickness, so the desired chipping resistance cannot be achieved unless applied thickly. Under severe corrosive environmental conditions, the film must be thickened, resulting in problems such as increased workability (sagging) in overcoated areas, increased weight, and increased costs.

In addition, the sagging property can be improved by increasing the viscosity by increasing the amount of filler, etc., but the sagging property limit film thickness is about 31 mm, and the coating property (spraying performance) becomes poor. There is a limit to increasing the thickness.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a fiber-reinforced undercoat that can improve chipping resistance even when the film thickness is reduced.

[Structure of the invention]

(Means for Solving the Problems) The fiber-reinforced undercoat material of the present invention is configured such that the resin base material contains reinforcing fibers in an amount of 10% to 30% by weight.

(Function) In the fiber-reinforced undercoat material of the present invention, the reinforcing fibers contained in the resin base material act as a connecting material to the coating film, so that high chipping resistance can be obtained even if the coating film is made thin. Even if the paint film thickness is set to be thick, the sagging limit film thickness is large, so the painting workability in the overcoated area can be improved.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example in which the fiber-reinforced undercoat material 1 of the present invention is laid on a floor panel 2 of an automobile.
The resin base material contains 0% reinforcing fibers such as glass fiber or carbon fiber.

The reinforcing fibers mentioned above have a fiber length of about 10 mm and a fiber length of 1
It is a mixture of ~3m+e. This mixing ratio is determined depending on the usage conditions, but the content of long fibers must be 50% or less. Moreover, if the total fiber content is 30% or more, the structure of the fiber-reinforced undercoat material becomes brittle, which is not appropriate.

Typical composition examples of the fiber-reinforced undercoat material 1 are shown in the table below.

(A) is for general use, and (B) is for areas that are particularly frequently recoated. Figure 2 shows the measurement results of the fiber-reinforced undercoat material of the present invention using the nut drop method. With the coating film having a thickness of 500 microns, the total weight (kg) of nuts falling until the substrate is exposed is 80 kg with the fiber-reinforced undercoat material of the present invention, whereas with the conventional product it is 15 kg or less. Ta.

In actual work tests, the sag limit film thickness of the fiber-reinforced undercoat material of the present invention was 5 to 8 mm, while that of the conventional product was approximately 3 m11, and the chipping resistance was approximately twice that of the conventional product. The paint quality and painting workability were also approximately twice that of conventional products.

〔Effect of the invention〕

As described above, according to the present invention, the base resin has a weight of 1
By blending 0% to 30% of reinforcing fibers such as glass fiber or carbon fiber, even a thin film can improve high chipping resistance, improve painting workability, and reduce the weight of the product.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a fiber-reinforced undercoat according to the present invention installed on the inner surface of an automobile body, and FIG. 2 is a diagram showing the results of an experiment on chipping resistance. 1... Fiber-reinforced undercoat material, 2... Automobile floor panel.

Claims (1)

[Claims] 1. A fiber-reinforced undercoat material containing 10% to 30% by weight of reinforcing fibers in a resin base material. 2. The fiber-reinforced undercoat material according to claim 1, wherein the reinforcing fibers are glass fibers, carbon fibers, or a mixture of both.