JPH0825253B2 - Composite board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to water resistance, wear resistance, bending strength, impact strength,
The present invention relates to a heavy load composite plate having excellent properties such as workability, lightness, and shock absorption.

[Prior Art and its Problems] Conventionally, Apiton lumber products have been mainly used for floor materials of trucks and trailers, and Apiton plywood for sea containers.

However, since the Apiton lumber products used for flooring are narrow plate materials, warping, bending, and expansion and contraction are significant, so it takes time and effort when installing on a truck bed, etc. there were. When traveling in rainy weather, water may intrude through the gap, and a metal plate such as aluminum was placed at the bottom of the lumber product to prevent this intrusion of water. The intrusion caused water to accumulate between the lumber product and the metal plate, resulting in corrosion of the lumber product.

Further, the above-mentioned Apiton lumber product is difficult to process because it may crack or fuzz along the grain of wood. Furthermore, when the load is unloaded, the corners of the load, the nails of the forklift, and the like are easily caught in the wood grain, and the lumber product is easily damaged, making it difficult to repair the damaged part.

The lumber product had to be thick in order to have strength, and was heavy in weight.

Also in terms of service life, due to the aforementioned corrosion and damage, it is shorter than the service life of the truck, and therefore replacement is required, resulting in high cost.

On the other hand, APITON plywood is superior to lumber products in terms of warpage and stretchability, but has problems in terms of water resistance, bending strength, susceptibility to breakage, and service life.

[Means for Solving Problems] The present invention solves the above problems by forming the following layers A, B, and C from the upper side to have a structure of A layer / B layer / C layer.

Layer A: A micro hollow body with respect to a thermosetting resin such as unsaturated polyester, vinyl ester or epoxy resin in a volume ratio of 1:
Mixing in the range of 0.5 to 1: 2.0, and carbon fiber having a length of 0.1 to 10 mm or glass fiber having a length of 0.1 to 30 mm in a weight ratio of 1: 0.004 to
Resin layer mixed in the range of 1: 0.6 B layer; Laminated wood board C layer composed of 3 or more layers; Carbon fiber or glass fiber unsaturated polyester,
Fiber-reinforced resin layer having a thermosetting resin such as vinyl ester or epoxy resin as a matrix will be described in detail below.

The thermosetting resin used for the layer A includes unsaturated polyester, vinyl ester, and epoxy resin as described above, and is not particularly limited.

Next, with respect to the thermosetting resin, vinylidene chloride balloons, silica balloons, minute hollow bodies such as glass balloons are mixed in a volume ratio of 1: 0.5 to 1: 2.0, and a carbon fiber length of 0.1 to 10 mm or a length of 0.1. ~ 30mm glass fiber weight ratio 1: 0.004
Mix in the range of ~ 1: 0.6.

Since the micro hollow body mixed in the thermosetting resin is rich in shock absorbing property, the load is dropped, and the shock due to vibration is absorbed, but if the mixing amount is less than 1: 0.5, no effect is obtained, If it exceeds 1: 2.0, workability will decrease. The above balloons may be used alone or in an appropriate mixture.

In addition, the fibers that are mixed in at the same time have the effect of imparting wear resistance, the effect of preventing chipping of the edges of the composite plate during processing with a processing machine such as a jigsaw, panel saw, router, etc. I have. If the length of the fiber to be mixed and the amount of the mixed fiber are less than the lower limit, the above-mentioned effects cannot be obtained, and if it exceeds the upper limit, workability is lowered and cost is increased.

 The thickness of the layer A is preferably 0.1 to 5.0 mm.

Next, for the layer B, a single plate having a thickness of 0.5 to 4.0 mm that can be used for plywood is combined in three or more layers so that the fiber directions are orthogonal to each other, and heated with a known thermosetting adhesive (epoxy, phenol, etc.),
Laminated wood board (thickness 10 to 30 mm) pasted under pressure is used. When the number of layers is less than 3, sufficient bending strength cannot be obtained, and therefore the number of C layer fiber layers must be increased, resulting in high cost.

The C layer is a fiber layer in which carbon long fibers or glass long fibers for imparting bending strength and impact strength are unidirectionally oriented in a thermosetting resin matrix such as unsaturated polyester, epoxy, vinyl ester resin or the like. A fiber reinforced resin layer having two or more fiber layers or one or more woven fabrics of carbon long fibers or glass long fibers as a fiber layer is used so as to be orthogonal to each other.

 The thickness of the C layer is preferably 0.01 to 2.0 mm.

 Examples will be shown below.

[Example] A composite plate was prepared in which the A, B, and C layers having the following compositions had a configuration of A layer / B layer / C layer.

A layer Resin: Vinyl ester Micro hollow body; Vinylidene chloride balloon Fiber: Carbon milled fiber (length 2.0 mm) Resin: Micro hollow body = 1: 1 (volume ratio) Resin: Fiber = 1: 0.06 (weight ratio) Thickness : 2.0mm B layer use veneer; 1.35mm thick APITON veneer veneer composition; 0 ° / 0 ° / 90 ° / 0 ° / 90 ° / 0 ° / 90 ° / 0 ° / 90 ° / 0
° / 90 ° adhesive; epoxy adhesive (coating amount 250g / m ² ) thickness; 13.3mm C layer resin; epoxy resin fiber layer; long carbon fiber 0 ° / 90 ° thickness; 0.4mm obtained in the above example Composite board and the apiton lumber product that was used as the floor material for the conventional truck carrier (both 11
Table 1 shows a comparison with the t-only, floor size 2400 x 9600 mm). The rupture strength in the longitudinal direction of the Apiton lumber product (thickness: 22 mm) that has been conventionally used is 310 Kg, and the product of the example showing a rupture strength of about the same level was used for comparison.

☆ Impact strength is measured by the following method.

A test piece measuring 40 cm in length and 30 cm in width is fixed to the joists arranged at intervals of 30 cm with screws, and an impact test jig weighing 10 kg (having a protrusion with a tip R of 10 mm) is freely dropped from above 1 m. The number of times until the test jig penetrates the test piece is measured.

As is clear from Table 1, the weight of the example product is 100 kg lighter than that of the Apiton lumber product, and both the bending strength and the impact strength are better than those of the Apiton lumber product. When the above Apiton lumber product and the example product are installed on the truck bed,
Apiton lumber products take a lot of work because it is necessary to line up narrow width plate materials and spread them, and when attaching the rope hook, the plate material is hollowed and attached so that the surface of the hook and the surface of the plate material are the same, Since the hook extends over two or three plate materials, it is troublesome to perform the hollowing process. On the other hand, since the product of the embodiment has a wide width, it can be easily installed on the truck bed and the hook can be easily attached.

On the other hand, since the layer A of the example product is composed of a thermosetting resin layer in which fibers and minute hollow bodies are mixed, it is excellent in water resistance and abrasion resistance and hardly scratches. Also, the screw stopper did not loosen during traveling.

[Effects of the Invention] In the layer A of the composite plate of the present invention, the carbon fiber or glass fiber disposed in the thermosetting resin has a wear resistance of the composite plate,
It prevents damage, improves workability, and improves screw holding power. Water resistance is imparted by the thermosetting resin,
If the surface of the composite plate is damaged, it can be repaired simply by applying the resin and curing it. Furthermore, the minute hollow body mixed in the resin causes vibration of the load,
It absorbs the impact of falling. Then layer B and C
The layer contributes to improving the bending strength of the composite plate,
The B layer is a laminated wood board composed of three or more layers.
If it is less than the number of layers, sufficient bending strength cannot be obtained, so that it is necessary to increase the number of C-layer fiber layers, resulting in high cost. If the layer B is too thick, the weight will increase. Therefore, the thickness is appropriately determined in consideration of cost, weight and the like.

Further, the fiber layer of the C layer and the resin have not only the effect of improving the bending strength but also the effect of improving the screw holding force and water resistance.

As described above, since the composite plate of the present invention has the structure of A layer / B layer / C layer from the upper side, the above-mentioned various effects are exhibited well.

Claims (1)

[Claims] 1. A composite plate characterized in that the following A, B, and C layers have a constitution of A layer / B layer / C layer. Layer A: Volume ratio of micro hollow body to thermosetting resin such as unsaturated polyester, vinyl ester and epoxy resin is 1: 0.
Mixing in the range of 5 to 1: 2.0, and carbon fiber having a length of 0.1 to 10 mm or glass fiber having a length of 0.1 to 30 mm in a weight ratio of 1: 0.004 to 1:
Resin layer mixed in the range of 0.6 B layer; laminated wood board C layer composed of 3 or more layers; carbon fiber or glass fiber in a thermosetting resin matrix of unsaturated polyester, epoxy, vinyl ester resin, etc. Oriented fiber layers or fiber layers in which two or more layers are laminated so as to be orthogonal to each other or fiber reinforced resin layers having one or more woven fabrics of carbon fibers or glass fibers