JPH07133663A - Vibration absorbable woody board - Google Patents

Abstract

PURPOSE:To enhance the vibration damping ability and the shock absorbing ability by mixing small wood pieces, a vibration energy absorbing material having a specific particle size and an adhesive together at specific weight ratios, and then heating and pressing thus obtained mixture into a planar shape. CONSTITUTION:25 to 150wt.% of vibration energy absorbing particulate made polyvinyl chloride or the like and having a particle size of 1 to 5mm is mixed with 100wt.%; of small wood pieces. Then, 5 to 15% of an adhesive is mixed with thus obtained mixture, with respect the completely dried weight of the wood piece, and then, the mixture is heated and pressed so as to be formed into a plate-like member. Thus obtained plate-like member is used for a floor, a roof or a wall base material. Accordingly, the noise insulation ability of housing can be enhanced, and the vibration absorbability can be adjusted by changing the mixing ratio, the particle size and kinds of materials to be used and the like. Further, it is possible to use wood having a small diametrical size, scrapped wood from the dismantled housing, waste plastic or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration-absorbing wood board which has excellent vibration-absorbing properties and produces less floor impact sound.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of hygiene such as generation of mites and the intention of nature, a wood-based finishing material (generally referred to as "wood flooring") instead of a carpet as a floor finishing material.
Is often used for multi-family houses and detached houses.

However, along with the wooden flooring boom, noise pollution such as the noise of walking on the upper floor, which is a problem particularly in apartments, has occurred, which has become a social problem.

For this reason, a soundproof floorboard has been developed in which a wood flooring plywood surface is covered with a wood board such as oak, and a cushioning material such as a vibration-damping rubber sheet or resin foam is attached to the back. It has been used as a countermeasure against floor impact noise on the upper floors of multi-family houses and detached houses. Wood is superior to metal materials in vibration absorption performance (vibration damping performance), but it is made to have vibration absorption performance by laminating vibration absorbing materials (vibration damping materials) such as soundproof floor boards and vibration damping steel plates. Although known as such materials, the materials of these laminated structures are limited in their application targets. However, wood-based materials that have improved the vibration-damping performance of the wood-based board itself have not been provided so far.

Further, woody board materials such as plywood and particle board are widely used in houses as floor, roof and wall base materials.

[0006]

In order to solve the above-mentioned floor impact sound problem, the present inventor remarkably improves the sound insulation performance of the floor by providing the floor base material with a vibration absorbing property. In addition, if a wood board with the same strength properties and vibration absorption as conventional wood boards such as particle boards and fiber boards is developed, it can be used not only for substrates but also for various purposes. The present invention was developed for the purpose of providing a wooden board having excellent vibration absorption.

[0007]

Means for Solving the Problems A characteristic of a vibration-absorbing wood board according to the present invention that achieves the above-mentioned object is that a vibration energy-absorbing material formed into granular particles of 1 to 5 mm and an adhesive are contained in a small piece of wood. It is contained by being dispersed and thermoformed into a plate shape.

The above-mentioned small pieces of wood (particles) can be obtained by using not only small-diameter wood, industrial waste materials, but also house dismantling materials, waste pallets, etc. as raw materials, and the size thereof is not particularly limited. A size of 0.2 to 0.6 mm, a length of several mm to 70 mm, and preferably about 10 to 30 mm can be used considering the circumstances of raw materials in Japan and the production line.

The vibration energy absorbing material can be manufactured by using butyl rubber, polynorbornene, or polyvinyl chloride resin as a raw material, but polyvinyl chloride resin can be preferably used from the viewpoint of economy and processability. Examples of the polyvinyl chloride resin include vinyl chloride homopolymers, copolymers of vinyl chloride and vinyl acetate, ethylene and the like. Also with this resin,
It is also possible to mix and use a plastic material, petroleum resin, or the like.

After extrusion manufacturing using these resin materials, for example, about 1 to 5 mm, preferably 1 to 2
With a particle size of about mm, the above vibration energy absorbing material can be used, and it is 25
To 150 parts by weight, preferably 40 to 150 parts by weight. If the blending amount is less than 25 parts by weight, there is a problem that the vibration absorption is insufficient, and conversely, if the blending amount exceeds 150 parts by weight, the strength and rigidity are deteriorated, which is not preferable.

As the adhesive compounded with the vibration energy absorbing material, urea resin, urea-melamine resin, phenol resin, isocyanate resin adhesive, etc. can be used, and isocyanate resin is particularly preferable. The amount of the adhesive added is preferably about 5 to 15% or less based on the total dry weight of the particles, and is usually 1
Good performance can be obtained by adding about 0%.

The production of a wood board thermoformed using each of these raw materials is carried out by a conventionally known method, for example, wood pieces (particles), wood fibers (fibers), urea resin or urea-melamine co-condensation resin. It can be carried out in accordance with the method for producing a particle board or fiber board obtained by adding an adhesive or the like and thermoforming.

That is, to explain the manufacturing method as an example, small pieces (particles) of wood cut and adjusted from a wood chip with a ring flaker and granular vibration energy absorbing materials are mixed at a predetermined ratio, and this mixture is mixed. The adhesive can be spray-coated with stirring in a blender, and after the adhesive is applied, the vibration absorbing material is formed so as to be uniformly dispersed in the wood particles, and the plate can be formed by hot pressing.

[0014]

The vibration damping performance of the wood board of the present invention is the ability of the absorber itself to absorb vibration energy and convert it into heat energy, that is, the loss coefficient (tan δ = loss elastic modulus) usually obtained by viscoelasticity measurement of the material. (E ″) / storage modulus (E ′)), and the larger the loss coefficient, the better the vibration energy absorption. Therefore, the wood board of the present invention containing a large amount of the vibration energy absorbing material has excellent vibration absorption. Further, the degree of vibration absorption can be selected by controlling the content of the vibration energy absorbing material.

[0015]

【Example】

Example 1 A vibration absorbing wood board was manufactured under the following conditions using the following materials.

Material: Small pieces of wood ... Red pine particles (length about 20 mm,
Width 4 mm, thickness 0.5 mm) Vibration absorber ... Polyvinyl chloride resin (manufactured by Tosoh Corp.) Adhesive ... Isocyanate resin (NLE-4002:
Nihon Kasei Co., Ltd.) Hot-pressing conditions A hot plate temperature of 180 ° C. and a pressing pressure of 35 kg / cm ^{2 were used,} and a board having a thickness of 15 mm was formed at a hot pressing time of 10 minutes.

By the above method, various wooden boards having a specific gravity of 0.7 and a constant content of the vibration energy absorbing material (vibration damping material) were prepared, and the change of the loss coefficient of these wooden boards was measured. It was measured. The results are shown in Fig. 1.

As can be seen from the results of FIG. 1, the loss factor of the wooden board containing the vibration absorbing material dispersed is large compared to the loss factor of the control board containing no damping material having a damping material content of 0, and It tended to increase with the increase of the damping material content.

Further, the vibration energy absorbing material content is 40%.
The wooden board was manufactured by the above method while changing its specific gravity variously, and its dynamic Young's modulus and loss coefficient were measured, and the relationship with the specific gravity of the wooden board is shown in FIG.

From the results of FIG. 2, the Young's modulus of the wooden board containing the vibration energy absorbing material of this example increases linearly with the increase of the board specific gravity, and the loss coefficient is constant regardless of the board specific gravity. It can be seen that, compared with the control board, it exhibits excellent vibration absorption.

Example 2 A wooden board was manufactured in the same manner as in Example 1 except that the particle size of the vibration absorber was changed in order to confirm the change in the loss coefficient of the board due to the difference in the particle size of the vibration energy absorber. Then, the dynamic elastic modulus and the loss coefficient were measured. The results are shown in Table 1 below.

[0022]

[Table 1]

As can be seen from Table 1, the smaller the particle size, the better the damping performance of the wooden board.

[0024]

EFFECTS OF THE INVENTION The wood board of the present invention has an excellent vibration absorption property. Therefore, when it is used as a floor, roof or wall base material of a house, it can contribute to improving the performance of the house such as sound insulation. There are the following effects.

The vibration-absorbing wood board can be manufactured by the same manufacturing process as that of the conventional particle board.

By changing the mixing ratio of the wood particles and the vibration absorbing material, boards having different vibration damping performance (vibration absorbing) can be manufactured. That is, the vibration damping performance can be controlled.

The vibration absorption can also be changed by changing the particle size of the vibration absorbing material.

The performance of the board can also be changed by changing the material of the vibration absorbing material.

Since the polyvinyl chloride resin mixed in the hot pressing step melts, it contributes to the adhesion between wood and vinyl chloride.

As the raw material, wood particles can be used as a raw material, such as small-diameter trees and factory waste materials, as well as housing dismantling materials and waste pallets.

Since the polypinyl chloride resin as the vibration absorbing material can be manufactured using waste plastic such as agricultural material as a raw material, it can contribute to environmental problems such as waste disposal problems.

[Brief description of drawings]

FIG. 1 is a diagram showing changes in the loss coefficient of a wooden board according to the present invention when the specific gravity of the wooden board is fixed at 0.7 and the content of the vibration absorbing material (vibration damping material) is changed.

FIG. 2 is a diagram showing the relationship between the dynamic Young's modulus, loss coefficient and board specific gravity of the wood board of Example 1 of the present invention in which the damping material content is 40%.

Claims (3)

[Claims] 1. A small piece of wood, in which a vibration energy absorbing material formed into a granular shape of 1 to 5 mm and an adhesive are dispersedly contained,
Vibration absorption, which is characterized by being hot-pressed into a plate shape,
A wooden board with shock-absorbing properties. 2. 1 to 100 parts by weight of a small piece of wood
The vibration energy absorbing material formed into 5 mm granularity is
A wood board having a vibration absorbing property and a shock absorbing property, which is characterized by containing 150 parts by weight and containing 5 to 15% of an adhesive agent based on the total dry weight of a small piece of wood and being thermocompression molded. . 3. The wooden board according to claim 1 or 2, wherein the vibration energy absorbing material is a polyvinyl chloride vibration absorbing material.