JPS58148724A - Suberose material and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel corky material and a method for producing the same.

In general, cork is a material that has excellent heat insulation properties, 2 elasticity, soundproofing properties, and temperament, and also has a unique texture on its surface. It is used not only for various crafts, construction materials, furniture materials, etc., but also for anti-vibration materials, banking materials, and a wide range of other applications.

Since the shapes and sizes that can be obtained naturally for such cork materials are limited, conventionally, cork grains are mixed with an adhesive liquid such as a thermosetting resin and then heated and pressed. For this reason, pressed cork that had been solidified into an appropriate shape such as a block was used.

In addition, this pressed cork can be sliced into slices depending on the purpose.

However, since the above-mentioned conventional pressed cork is made by bonding cork grains together by hardening an adhesive liquid, it may reduce various properties such as the elasticity that cork originally has. It is difficult to obtain uniform physical properties, and it takes time to apply and cure the adhesive liquid, resulting in low productivity (7).

Therefore, in view of this, the present invention uses a foamed resin material as the layer that binds cork grains, thereby making it possible to use a cork-based material that does not impair the various properties of cork, and can also be used in a wide variety of applications. The object of the present invention is to provide a cork material that can also have excellent physical properties.

Furthermore, the present invention provides a method for producing the corky material described in -, in which a raw material consisting of cork grains and a thermoplastic resin body having thermal foaming property is placed in a mold, and the thermoplastic resin body is made of a large number of corks. The raw material is heated at IW at a temperature higher than the temperature at which the thermoplastic resin body softens and foams. ``Using foaming pressure'': Provides a method for producing corky material that can be manufactured with high productivity even with simple equipment by bonding recork grains together with foamed resin.

Here, the cork grains used in the present invention can be of any shape, such as particulate, flat, irregular, etc., and are not particularly limited in thickness, or have a diameter of 0.5 to 1 OIRI! It is preferable to obtain a more homogeneous corky material.

The thermoplastic resin body used in the present invention is an ethylene-vinyl acetate copolymer resin or a vinyl chloride resin.

It is made by adding commonly used blowing agents such as decomposable blowing agents and volatile blowing agents to polyethylene resin, polypropylene resin, etc., and its shape is not particularly limited. It is advantageous because it has good workability during manufacturing and it is possible to obtain a homogeneous corky material. In particular, ethylene-vinyl acetate copolymer resin is suitable because it can exhibit elasticity similar to cork. Additionally, additives such as plasticizers, stabilizers, fillers, etc. may be added to the resin VC described in 2. There are a number of organic separating agents such as pentamethylenetetramine azodicarbonamide.

Hereinafter, implementation ρ11 of the present invention will be explained based on the drawings.

FIG. 1 shows a cork material HA according to the present invention, in which a large number of cork grains 1 are integrally bonded by a foamed resin body 2 to form, for example, a plate shape.

In the past, since the above-mentioned cork material A is a layer that binds cork grains 1 or a foamed resin body 2, it can have the various properties that cork has, such as heat insulation and elasticity, and is also foamed. By changing the type of resin body 2, expansion ratio, proportion to cork grains, etc., it is possible to make it have various physical properties that cannot be obtained with conventional pressed cork. In addition, this cork material A is produced by placing cork grains and a heat-foamable thermoplastic resin in a predetermined mold, and heating or heating and pressurizing the foaming pressure of the thermoplastic resin. It can be easily formed into various shapes other than the plate shape shown in FIG.

Next, the method for producing the cork material A will be described with reference to FIG. 2. First, cork grains 1 and a notebook-like or thin plate-like material having heat-foaming property are placed in a predetermined mold 6 shown in FIG. A raw material 5 consisting of a thermoplastic resin body 4 is placed so that the thermoplastic γl'j 1/1:resin body 4 is located below -lx of a large number of cork grains 1,1. to be loaded. The mold 6 used here includes a lower mold 5a shaped like a container with an open top into which the original E5 is loaded as shown in the figure;
and an upper mold 5b having a shape that can close the opening of the
Of course, the mold material may be of any shape as long as it can be installed in a press equipment such as a hot press, or it can be used in the present invention to load raw materials and demold the obtained cork material. It is.

Incidentally, here, the thermoplastic resin body 4 has a large number of cork grains 1.
, 1... In addition to being placed above and below the layers, cork grains 1, 1 ・ may also be placed in the middle of the layers as shown in Figure 3. Especially when the cork material A is thick, the cork grains may be placed in the vertical direction ( This is effective in homogenizing the foamed resin 2 in the thickness direction) to prevent intermediate peeling and improve strong IW. Also, a large number of cork grains 1,1
They may be arranged on the left and right sides or all around the area, and are appropriately selected and arranged depending on the shape and size of the cork material A to be formed.

Next, as shown in FIG. 3C, the raw material 5 loaded in the nuclear mold 5 with the molds 3 together is heated in a temperature tool 2 in which the thermoplastic resin body 4 softens and foams. Heat it at a temperature of
The thermoplastic resin body 4 is foamed.

At this time, since the raw material 5 is surrounded by the mold 6, the foaming pressure of the thermoplastic resin body 4 causes the foamed thermoplastic resin to soften and melt between the cork grains 1, 1, and 1. The cork material A of the present invention is formed as shown in FIG.

Furthermore, since the method of the present invention utilizes the foaming pressure of the heat-foamable thermoplastic resin body 4 as described above, no particular pressure conditions are required; It is also possible to arrange a press device 6 such as K-type 6 to simultaneously heat and press the raw material 5 with second die 6b.

Therefore, the cork material A obtained in this way is made by combining the cork grains 1 with the foamed resin body 2 using the heat-foamable thermoplastic resin body 40 and the foaming pressure. Moreover, it can be manufactured with high productivity by a simple operation of loading the raw material 5 above, above, around, etc. of a large number of cork grains in a mold and heating it. 4. In addition, it is possible to easily produce cork material A having various physical properties depending on the type of resin, expansion ratio, whether or not pressure is applied, and the ratio of resin to cork grains.

Next, a specific example of the present invention will be described.
InIn cork grains 100 layers and thickness 1ml+
A raw stone consisting of 18 parts by weight of heat-foamable ethylene-vinyl acetate resin at a foaming temperature of 150 to 160°C and a foaming ratio of 5 times is placed in a predetermined mold with the resin at the top and bottom of a large number of cork grain layers. After loading, it was molded with a hot press for 20 minutes under a slight pressure of 1 to less than 1 and heating at 180°C, 12 mm thick x 70 pieces, IX 20
A cork material with a specific gravity of 0.40 was obtained at 0 tone.

This cork-based material has the characteristics of cork: resilience under pressure (elasticity), soundproofing, earthquake proofing, and heat insulation.

It was airtight and strong.

As described above, the cork material of the present invention not only has the various properties of cork, but also has various physical properties depending on the intended use, and can be used not only as a furniture material and a construction material. It can be used for a wide range of applications including vibration isolating materials and backing materials.

Furthermore, according to the manufacturing method of the present invention, the cork material described above can be manufactured easily and with high productivity even in simple equipment.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, FIG. 1 is a perspective view showing the cork material of the present invention, FIG. This is a diagram corresponding to FIG. 2 (b). A: Cork material, 1: Cork grains, 2: Foamed resin body, 4: Thermoplastic resin body, 5: Raw material.

Claims (3)

[Claims] (1) A cork material made of cork grains bound together by a foamed resin body. (2) Loading a raw material consisting of cork grains and a heat-expandable thermoplastic resin body into a mold such that the thermoplastic resin body is positioned above, below, left and right, or around a large number of cork grains,
A method for producing a corky material, characterized in that the raw material is heated at a temperature higher than the temperature at which the thermoplastic resin body softens and foams, and cork grains are integrally bonded with a foamed resin. (3) The method for producing a cork material according to claim 21, wherein the thermoplastic resin body is in the form of a sheet or a sheet.