JPH07178712A - Preparation of far infrared rays radiator made of carbon - Google Patents

Abstract

PURPOSE:To obtain a carbon-made far infrared rays radiator with various shapes such as a panel shape in various sizes in few number of processes and low cost by pelletizing and performing injection molding or extrusion molding and to make injection molding and extrusion molding easy by using a thermoplastic resin binder with a high emissivity. CONSTITUTION:A carbon compsn. wherein a carbon powder and a thermoplastic resin binder are incorporated is made into pellets, which are then injection- molded or extrusion-molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a far infrared radiator made of carbon.

[0002]

2. Description of the Related Art Far-infrared rays are electromagnetic waves having a wavelength of 4 to 50 microns among infrared rays having a wavelength longer than that of infrared rays, and are effective for growing living things.
The wavelength of 8 to 14 microns has a great effect on the human body. It penetrates up to 40 to 50 mm under the skin and resonates the cells to heat and warm the body from the core, dilation of microvessels, and activity of blood circulation. It has a remarkable effect on aging, enhancement of metabolism, elimination of body fluid disorder, increase of tissue regenerative power, promotion of growth, etc., and it is used for incubators for premature babies and thermal physiotherapy machines in medical institutions. It is widely used for cooking food.

[0003] As a cooking heating plate used for cooking the dish, there is a heating plate made of a graphite material obtained by firing a carbon material and graphitizing it. At the time of manufacturing this, a petroleum-based or coal-based coke is used. Pitch and tar are added as a binder to the product, and the product is once formed into a certain shape by press molding or the like, fired, and pitch or resin impregnation and firing are repeated to graphitize, and a process of processing this into a heating plate is adopted. ing. Therefore, the process becomes long, and the cost becomes high.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a carbon-based far-infrared radiator which has a simple manufacturing method and is excellent in far-infrared radiation efficiency. The above and other objects and novel characteristics of the present invention will be apparent from the description of the present specification.

[0005]

The present invention is characterized in that a carbon composition containing carbon powder and a thermoplastic resin binder is formed into pellets, and the pellets are injection-molded or extrusion-molded. The present invention relates to a manufacturing method of a far infrared radiator.

As the carbon powder used in the present invention, graphite powder and carbonaceous powder can be used, but the use of graphite powder is preferable. A thermoplastic resin is used for the resin binder in consideration of injection molding or extrusion molding in the subsequent step. Examples of the thermoplastic resin binder include polypropylene, polyethylene, polyacetal and the like. The blending ratio of the carbon powder in the composition is 10 to 10.
40% by weight, preferably 15-30% by weight, 10% by weight
If it is less than 40% by weight, the far-infrared radiation effect is insufficient, and if it exceeds 40% by weight, the effect is saturated, and it is not economical to compound more, and molding becomes difficult. The carbon composition may be composed of the above carbon powder and a thermoplastic resin binder, but if necessary, within a range that does not hinder the far infrared radiation effect, natural graphite, a ceramic containing a far infrared radiation substance as appropriate. Materials may be added.

The far-infrared radiator according to the present invention is obtained by kneading and pelletizing a carbon composition obtained by mixing carbon powder, a thermoplastic resin binder, and other artificial graphite, etc., which are appropriately used as necessary. It can be obtained by injection molding or extrusion molding. For example, the composition is mixed with a mixer, kneaded with a mixing roll, the kneaded material is crushed by adjusting the particle size, or pelletized by a method such as granulating the powder with a granulator, The pellets may be injection molded or extruded. The method of injection molding is, for example, supplying the pellets to the hopper of the injection molding machine, heating and fluidizing in the cylinder of the injection molding machine, injecting into the mold at high pressure, cooling and solidifying, opening the mold, It can be performed by a method of taking out an injection-molded article. The carbon composition may be kneaded with a single-screw or twin-screw extruder and extruded to form pellets. The pellets may be supplied to an extrusion molding machine to extrude the far infrared radiator. .

By pelletizing and injection-molding or extruding the pellets, carbon-made far-infrared radiators of various shapes such as plates of various sizes can be produced in the post-process of the conventional graphitizing material. The number of steps can be reduced in one step without the need for machining such as. Also,
By combining carbon powder and resin binder,
Pitch and tar are added to conventional petroleum-based or coal-based coke as a binder, and once shaped into a certain shape by press molding, etc., baked, and pitch or resin impregnation and baking are repeated to graphitize and cook this. It is possible to obtain an emissivity that is almost the same as that used for the heating plate. Furthermore, by using a thermoplastic resin binder as the binder, injection molding and extrusion molding can be facilitated, the number of steps is small, and the cost can be reduced to obtain a carbon far-infrared radiator.

[0009]

EXAMPLES Next, examples of the present invention will be shown. Example 1. 20% by weight of graphite powder and 80% by weight of polypropylene resin binder are kneaded by a twin-screw extruder and extruded to form pellets, and the pellets are supplied to a hopper of an injection molding machine, a cylinder temperature of 260 ° C., an injection pressure of 100 kg.
/ Cm ² , injection-molded in a mold, cooled and solidified, the mold was opened, the injection-molded product was taken out, and a far-infrared radiator usable as a thawing plate was obtained. With respect to the carbon radiator, the emissivity at a wavelength of 5 micron at each measurement temperature shown in Table 1 was measured. The results are shown in Table 1. Also, FIG.
Further, a graph comparing the far-infrared emissivity of the carbon radiator at a measurement temperature of 74 ° C. as a black body (an object that radiates thermal radiation with a maximum spectral density at a constant temperature) of 1.0 is further shown:
FIG. 2 shows the amount of radiant energy (w / (cm ² · ster · micro) of the carbon radiator at each measurement temperature.
n)) shows a graph comparing the distribution with the black body radiation energy distribution. From these Table 1, FIG. 1 and FIG. 2, the carbon radiator of the present invention has a high emissivity in the effective wavelength region,
Also, it can be seen that it has a radiation performance close to that of a black body.

Embodiment 2. An injection molded product was taken out in the same manner as in Example 1 except that a polyethylene resin binder was used in place of the polypropylene resin binder to obtain a far-infrared radiator that can be used as a thawing plate. The emissivity of the carbon radiator was measured in the same manner as in Example 1. The results are shown in Table 1.

Embodiment 3. Graphite powder 30% by weight and polyethylene resin binder 70% by weight are kneaded by a uniaxial extruder and extruded into pellets, and the pellets are supplied to an extrusion molding machine, a mold temperature of 250 ° C., an outlet temperature of 125 ° C., an extrusion pressure. It was extruded at 100 kg / cm ² to obtain a far infrared radiator that can be used as a thawing plate. The emissivity of the carbon radiator was measured and found to be 0.
The emissivity was 0.918 at 949 and 160 ° C.

[0012]

[Table 1]

[0013]

As described above, according to the present invention, a far-infrared radiator having a far-infrared radiation effect can be obtained at a low cost in a small number of steps. Without stopping, cooking utensils, electronic devices,
A wide range of applications such as parts, various industrial equipment, environmental equipment such as water purification, toy equipment, etc. can be expected, and it is particularly useful as a thawing plate having a far infrared radiation effect by carbon.

[Brief description of drawings]

FIG. 1 is a graph comparing the far infrared emissivity of the product of the present invention with a black body of 1.0.

FIG. 2 is a graph comparing the radiant energy amount distribution of the product of the present invention with the radiant energy amount distribution of a black body.

[Explanation of symbols]

 A: product of the present invention, B: black body,

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C04B 35/52 C08K 3/04 KAB C08L 101/00 C04B 35/54 B

Claims (1)

[Claims] 1. A process for producing a far infrared radiator made of carbon, characterized in that a carbon composition containing carbon powder and a thermoplastic resin binder is formed into pellets, and the pellets are injection-molded or extruded.