JPH0622890B2 - Three-layer polymer material rolled plate and method for producing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a plate-like product of a polymeric material having a three-layer structure obtained by rolling and a method for producing the same.

[Prior Art] It is known that when a polymeric material containing reinforcing fibers is rolled, its strength is further increased. For example, JP-A-57-57627 discloses a rolled sheet of polyester sheet containing reinforcing fibers. This polymer material rolled plate is a polyester unstretched sheet containing 50% by weight or less of a linear reinforcing material, which is rolled by a roll to a stretching ratio of 1.5 or more in one direction, and then rolled in a direction perpendicular to the rolling direction. It is obtained by rolling at a draw ratio of 1.2 or more. Thus, in this polymer material rolled plate, the reinforcing fibers are arranged on the plane, and the tensile strength in the second rolling direction increases. (However, there is no description about the tensile strength in the direction perpendicular to the rolling direction.). However, since the rolled polymer material plate manufactured by this prior art is obtained by rolling the fiber-containing resin, it has a drawback that the reinforcing fibers are exposed on the surface and the appearance is remarkably poor.

[Problems to be Solved by the Invention] In view of the above points, the present invention has a three-layer structure in which a polymeric material plate containing reinforcing fibers is inserted and both surfaces are ordinary polymeric material plates, It was made for the purpose of providing a rolled polymer material plate having excellent surface properties and high strength, and a method for producing the same.

[Means for Solving the Problems] A feature of the present invention is that it is composed of an inner layer of a polymeric material containing 1.40% by weight or less of reinforcing fibers and an outer layer of a pure polymeric material, and is stretched in one direction. Oriented three-layer polymer material rolling plate, 2. A three-layer polymer sheet consisting of an inner layer of polymer material containing up to 40% by weight of reinforcing fibers and an outer layer of pure polymer material, A method for producing a three-layer rolled polymeric material plate, which comprises unidirectionally stretching in a temperature range just below the melting point of the material.

Hereinafter, the present invention will be described in detail with reference to the drawings.

The inventors of the present invention conducted a rolling experiment of a polymer material having a three-layer structure (outer layer material 1: polypropylene, inner layer material 2: polypropylene + glass fiber, total material thickness: 20 mm) by a rolling method as shown in FIG. I went. As a result, as shown in FIG. 2 and FIG. 3, the reinforcing fiber content of the inner layer material is within the range of 40% by weight or less and the ratio of the inner layer material thickness to the total material thickness (h _CO
/ H _TO ) is 0.1 or more, by keeping the rolling temperature just below the melting point of the polymer material, the thickness ratio of the outer layer material, which is a normal (pure) polymer material, and the inner layer material containing reinforcing fibers It was found that the material can be rolled while maintaining the state of the material. Here, the reduction ratio of the inner layer material containing reinforcing fibers and the material thickness is φ (φ = reduction rate of inner layer material / thickness of three layer material)
It is defined as

Further, as a result of detailed examination of the rolled plate, in the scope of the present invention, the polymeric material of the inner layer containing the reinforcing fibers does not cause separation, etc. It was found that the tensile strength of the rolled plate increases as the draw ratio is increased due to the orientation of the molecular chains of the molecular material itself.

FIG. 4 shows, as an example, the reinforcing properties when a three-layer material using polypropylene as the outer layer and polypropylene containing 10% by weight of glass fiber having a diameter of 10 × 100 (μm) as the inner layer is rolled. For example, when rolling to a stretch ratio λ ₁ = 3.9, the tensile strength in the rolling direction at that time is 15.8 kgf / mm ² ,
The strength in the rolling direction is greatly increased compared to the material of 4.1 kgf / mm ² .

The adhesive force between the outer layer and the inner layer is sufficient because compressive stress acts in the plate thickness direction by rolling, and even if deformation of elongation is applied, the outer layer and the inner layer are not separated until the inner layer breaks.

Regarding the surface properties of the rolled plate, since the outer layer is a pure resin, the reinforcing fiber is not exposed on the surface, and the rolled plate shows an excellent surface state equivalent to that of a general pure resin.

[Example] The following materials (total plate thickness 20 mm, width 300 mm, length 500 m
m) to 140 ° C and rolls with an outer diameter of 300 mm (temperature 120
C) was used to roll in one direction to a plate thickness of 4.5 mm in 6 passes. At that time, the reduction ratio φ between the inner layer and the total plate thickness is 98.2.
% Met.

Rolling direction tensile strength of the rolled plate 17.6kgf / mm ^2, the rolling direction and 90 ° direction is 4.2kgf / mm ^2, compared to 4.1kgf / mm ² of the material, the strength in the rolling direction is significantly Increased.

The surface of the rolled plate showed an excellent surface condition equivalent to that of pure resin.

Outer layer: polypropylene, thickness of one layer h _CO = 1.0mm Inner layer: polypropylene + glass fiber (diameter 10 μm, length 10
0 μm, 5 wt%) + ceramic fiber (diameter 50 μm, length
200 μm, 5% by weight) Plate thickness h _CO = 18.0 mm [Effect of the invention] As described above, according to the present invention, a high strength fiber-reinforced polymer rolled plate having good surface properties can be obtained. .

[Brief description of drawings]

FIG. 1 shows an outline of the manufacturing method in the present invention. Second
The figure shows the rolling reduction ratio of the inner layer and the total plate thickness of the rolled plate in the present invention. FIG. 3 shows the drawing ratio of the rolling limit in the present invention. FIG. 4 shows the strength characteristics of a unidirectionally rolled sheet according to the present invention. 1 ... Outer layer of rolled material, 2 ... Inner layer of rolled material, 3 ...
roll.

Claims (2)

[Claims] 1. A three-layer rolled polymeric material plate comprising an inner layer of a polymeric material containing 40% by weight or less of reinforcing fibers and an outer layer of a pure polymeric material and stretched and oriented in one direction. 2. A three-layer polymer sheet consisting of an inner layer of a polymer material containing 40% by weight or less of reinforcing fibers and an outer layer of a pure polymer material is unidirectional in a temperature range just below the melting point of the polymer material. A method for producing a three-layer polymer material rolled sheet, which comprises stretching the sheet into a sheet.