JP3011921U - Synthetic resin lightweight board with plant fiber as aggregate - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to use coconut fiber, oil palm fiber, jude fiber or other plant natural fiber as an aggregate of the foamed hard urethane resin lightweight board. [Structure] A natural fiber of plant origin such as coconut fiber, oil palm fiber, jute fiber, etc. is defibrated and this is foamed and hardened into a plate shape with a hard urethane resin.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a light-weight board made of a rigid urethane resin having an aggregate of plant-derived natural fibers such as coco fiber, oil palm fiber and jute fiber.

[0002]

[Prior art]

 There is a lightweight plate made of glass fiber as an aggregate, which is made of urethane resin as the main material, and is molded and cured, for the purpose of lightweight, water repellency, heat insulation, processability, corrosion resistance, and rigidity.

[0003]

[Problems to be solved by the device]

 As described above, glass fibers are used as the aggregate of the conventional rigid urethane lightweight board.

The purpose of using this glass fiber is to utilize the original rigidity of the aggregate and material characteristics such as void formation due to the entanglement of the aggregate fiber.

Most of the purpose of use of this aggregate, that is, glass fiber, is nothing but importance on the connection as twisting and tensile strength, rather than compression strength strengthening.

In addition, fire resistance can be mentioned as a dual purpose, but it is only a slightly complementary effect.

Rather, due to the fibrous nature of the aggregate, it is likely to include bulking material factors due to void formation.

However, in many cases, the glass fiber used as the aggregate remarkably impairs the working environment and the health of the worker at the time of manufacturing using it as a raw material.

In addition, the glass fiber has a straight cross-section with a fine unit cross-sectional diameter, is short, and has high rigidity, and has a low defibration and miscibility to achieve a density set by these, and particularly low Since it is difficult to carry out the mixing operation to make the density, it is impossible to increase the porosity, so there is a drawback that a large amount of urethane resin is used more than necessary.

As described above, the glass fiber that has been used as an aggregate in the past does not have the strength characteristics of the aggregate as the first requirement element, but the connection of the product material that is a plate. As a material, that is, as a tie material, and as a fibrous body as a means for forming voids by entanglement, a material element was sought for glass fiber.

Therefore, the object of the present invention is to use plant natural fibers such as coconut fiber, oil palm fiber, and jude fiber as an aggregate of the foamed hard urethane resin lightweight plate.

[0012]

[Means for Solving the Problems]

 As a means for achieving the above object, the present invention comprises defibrating vegetable natural fibers such as coconut fiber, abrasil fiber and jute fiber, and foaming and hardening them into a plate shape with a hard urethane resin. It is a thing.

[0013]

[Action]

 Single type of defibrated coconut fiber, oil palm fiber, or jute fiber.If necessary, multiple types of vegetable natural fibers are sprinkled with a set amount of phenol binder, and the set amount is set on the molding table. It is placed evenly in the standard frame, and a hard urethane resin is sprayed and laid so that the placed natural fibers become aggregates. It is placed under pressure from the top through a dimension that is the set plate thickness, and foamed and molded.

The hard urethane foam resin injected has a strong outward-oriented effect due to a swelling phenomenon due to a foaming effect during molding, and therefore, urethane having a particularly high density on the inner surface along the regulated frame. A plate of layers is formed.

This foamed form is a surface water-repellent body having no urethane resin characteristics and no communication with other bubbles and almost no air permeability, and in particular, as described above, the surface in contact with the mold is highly Since the resin layer with the density is formed, it becomes a smooth surface, and conversely, the density becomes coarser toward the center of the plate thickness, and the delay rate of the degree of resin infiltration into the void formed by the entanglement of plant fibers. Is formed in a low density proportional to.

[0016]

【Example】

 The natural cross-section diameter of plant-derived natural fiber such as coco fiber, oil palm fiber or jute fiber used in the present invention is non-uniform with a maximum of about 30 microns, and its length is 200 excluding jute fiber. Since the jute fiber that has been removed in millimeters is quite long, it should be cut to an appropriate set size. Compared to those with a micron length of 70 mm to 100 mm, the single substance is considerably larger, and the flexibility of natural plant fiber used in the present invention is larger, especially in the longitudinal direction of the fiber. The rigidity of the glass fiber is much greater than that of the glass fiber, and the fiber morphology is a natural curl compared to the straight shape of the glass fiber. It has already occurred even at the time.

In addition, these natural vegetable fibers do not show any hindrance to the atmosphere and workers during defibration and filling and setting in the mold.

[0018]

[Experimental example]

 When molding a plate having a desired thickness of 12 mm, width of 1000 mm and length of 1000 mm, 800 g to 1000 g of a phenol binder-bonded natural plant fiber coconut fiber, oil palm fiber, Alternatively, 450 g of urethane resin was foam-molded into each single type of jute fiber or a plurality of types of jute fiber as required.

This gave a flexural strength of 230 kilograms per cubic centimeter. (By the way, the bending strength of the rigid foamed urethane resin lightweight plate made of glass fiber as an aggregate is 200 kg / cm3.)

In the experiment, a plurality of examples with different kinds of material weights were performed, but the above-mentioned numerical values are the most preferable examples in terms of product characteristics.

Further, in the enlarged cross-sectional view of the synthetic resin lightweight board A shown in the figure, reference numeral 1 is a simple substance of vegetable natural fiber such as coco fiber, oil palm fiber or jute fiber, 2 is a hard urethane foam resin, and 3 is a bubble. The density of the cross-hatched lines indicates the density of the resin component.

[0022]

[Effect of device]

 The present invention configured as described above does not provide any hindrance to the atmosphere and the manufacturer in the manufacturing process.

In the manufacturing process, it is possible to set the natural density of the plant natural fiber, which is an aggregate, freely and with an average density.

In addition, the product can be cut into any desired shape, and can be easily punched, nailed, etc., and freely colored during manufacturing. Printing is free and adhesive bonding is possible.

Further, it is lightweight, has an airtight surface, has high hardness, is not easily scratched, has water repellency, corrosion resistance, and the like, and can be disposed of by incineration when it becomes a waste material. It is possible.

Furthermore, by reducing the amount of the hard urethane foam resin used, the light specific gravity can be set far higher than that of the conventional lightweight plate of the same kind, so that it can be provided to the world at a low price. It is a thing.

[0027]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 Enlarged sectional view of a rigid resin lightweight plate

[Explanation of symbols]

 1 Vegetable natural fiber 2 Hard urethane foam resin 3 Bubble A Synthetic resin lightweight board

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Claims (1)

[Scope of utility model registration request] 1. A plant fiber characterized by being formed by defibrating natural plant fibers such as coco fiber, oil palm fiber and jute fiber, and foaming and hardening this into a plate with a hard urethane resin as an aggregate. A lightweight board made of synthetic resin.