JPH0811762B2 - Wax-like substance production method and its production apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a wax-like substance used for pigments and casting.

[0002]

2. Description of the Related Art Conventionally, as a method and apparatus for producing the above wax-like substance, for example, Japanese Patent Laid-Open No.
As described in Japanese Patent Publication No. 190494, waste of synthetic resin such as polyethylene resin is treated as a raw material for fuel,
It is known to produce waxy materials useful for pigments or casting.

In such a device, as shown in FIG.
The tank 21 for receiving the wax-like substance melt is provided with the supporting leg 21a.
The cylindrical combustion basket 22 is integrally mounted and fixed to the upper end opening of the receiving tank 21.

At the lower part of the combustion basket 22, a raw material tray, that is, a rostrut 23 is installed, and a large number of rostrul holes 23a are bored in the rostrut 23, and innumerable side walls of the combustion basket 22. An air introduction hole 22a is provided.

A closed box-shaped catalyst tank 24 filled with a linear metal catalyst for promoting thermal decomposition closes the lower end opening 22b of the combustion basket 22. Attached, and its catalyst tank 2
All walls of No. 4 are mesh-shaped.

A cylindrical air balancer 25 for adjusting the air supplied to the combustion basket 22 is installed on the outer periphery of the combustion basket 22 at a predetermined interval, and an air introduction opening is provided in the lower portion of the air balancer 25. The portion 25a is provided.

A raw material charging hopper 26 is attached to the upper end opening 22c of the combustion basket 22, and an exhaust tower 27 is disposed above the raw material charging hopper 26.

Next, a method for producing a wax-like substance using the above-mentioned production apparatus will be described. First, as the raw material A ', flammable, for example, highly crosslinked polyethylene,
A raw material A'is fed into the combustion basket 22 in a predetermined amount from the raw material feeding hopper 26 by using a mixture of polyolefin such as non-crosslinked, low-crosslinked and high-crosslinked polyethylene or the like for forming a wax-like substance and polystyrene.

Then, the highly cross-linked polyethylene in the raw material A'is ignited and burned to melt the synthetic resin for producing the wax-like substance, and the melt B'is dripped from the rostrul hole 23a while the catalyst tank is being used. It passes between 24 catalysts and falls into the receiving tank 21.

At this time, the oxygen in the catalyst tank 24 and the receiving tank 21 is rapidly consumed, and the oxygen is deficient in them, and the melt B'is thermally decomposed in the oxygen deficient state and waxed. The particulate matter C ′ is accumulated in the receiving tank 21.

A part of the wax-like substance C'melted and in a high heat state is vaporized in the oxygen-deficient state to generate a flammable high heat gas G ', which rises. Then, in the combustion basket 22 at the burning place of the raw material A ′, the raw material A ′ is continuously melted by being mixed with the air introduced from the air introduction hole 22a and burning. Therefore, the above-described configuration requires the supply of heat energy at the time of startup, but after that, heat energy is supplied independently.

[0012]

However, in the above-mentioned conventional method, the combustible gas G'and the particulate carbon are generated in the oxygen-deficient apparatus when the wax-like melt is generated. Since the particulate carbon that rises together with it does not burn up in the combustion basket 22 or the like, it adheres to the side wall inside the device above the rostrut 23 to become carbon particles, and the carbon particles are wax-like in the storage tank 21. It falls into the substance C ′ and becomes an impurity.

When such a wax-like substance C'mixed with carbon particles is used as a wax mold for casting, the carbon particles precipitate during dewaxing and remain in the mold, and when baking or casting the mold, This causes a problem that the mold is cracked or damaged.

[0014]

In order to solve the above-mentioned problems, the method for producing a waxy substance according to claim 1 of the present invention comprises: burning a synthetic resin having self-combustibility inside a basket for combustion; The combustion heat heats and melts the wax-like substance-forming synthetic resin to cause a thermal decomposition reaction,
The molten wax-like product is dropped into the oxygen-deficient atmosphere in a drop shape to accelerate the thermal decomposition reaction to obtain a wax-like melt, and a part of the wax-like melt is further decomposed during the reaction. In the method for producing a wax-like substance, which comprises returning the combustible high-heated gas to the inside of the combustion basket and utilizing it as energy for combustion and thermal decomposition, the wax-like melt is heated by a heating means, It is characterized in that the temperature inside the combustion basket is controlled by controlling the generation of combustible high-temperature gas.

In order to solve the above problems, an apparatus for producing a wax-like substance according to a second aspect of the present invention has upper and lower end portions opened at the upper end opening portion of a tank for receiving a wax-like melt. In addition, a combustion basket that heats and melts the raw material is mounted and mounted, a number of air introduction holes are provided on the peripheral wall of the combustion basket, and a porous raw material tray on which the raw material can be mounted is laterally seated on its inner peripheral wall. And a wax-like substance manufacturing apparatus in which one or more thermal decomposition accelerating baskets having a perimeter wall having a porous upper end opening are attached to the lower end opening of the combustion basket and arranged inside the tank.
A heating means for heating the wax-like melt is provided in the tank, and a control means for controlling the heating means to keep the temperature in the combustion basket at a predetermined temperature is provided. .

[0016]

According to the method described in claim 1, since the generation of the combustible high-temperature gas is increased, the combustion temperature in the combustion basket communicating with the combustion basket can be raised, and the combustible gas can be increased. It is possible to reduce the amount of carbon generated together with the combustion basket by burning more.

According to the second aspect of the present invention, the control means controls the heating means to control the melting temperature of the wax-like melt, whereby the flammable high-heat gas generated from the wax-like melt. It is possible to control the production amount of. Therefore, the combustion amount of the combustible high-temperature gas in the combustion basket communicating with the inside of the tank can be controlled, and the internal temperature of the combustion basket can be adjusted.

As a result, the internal temperature of the combustion basket can be adjusted so as to burn more carbon in the combustion basket when the combustible high-temperature gas is generated, and the carbon content can be reduced. Become.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to FIGS. 1 and 2. In the wax-like substance manufacturing apparatus, as shown in FIG. 1, a tank 1 for receiving a wax-like substance melt is supported by a supporting leg 1a,
A cylindrical combustion basket 2 is integrally mounted and fixed on the tank upper end opening 1b of the storage tank 1.

In the lower part of the combustion basket 2, a rostrur 3 which is an upwardly convex raw material tray is installed so as to close the lower end opening 2a of the combustion basket 2 from above, and the rostrut 3 has A large number of rostral holes 3a are formed, and on the other hand, in the side wall of the combustion basket 2, innumerable air introducing holes 2b are formed.

The lower end opening 2 of the combustion basket 2
A closed box-shaped catalyst tank 4 is attached to a so as to close the lower end opening 2a from below, and the entire wall of the catalyst tank 4 has a mesh portion 4a. The catalyst tank 4 is filled with a linear catalyst 4b made of a metal for promoting thermal decomposition of the melt B, such as platinum or copper, so that the melt B can pass through.

A cylindrical air balancer 5 for adjusting the air supplied to the combustion basket 2 is installed on the outer circumference of the combustion basket 2 at a predetermined interval, and an air introduction opening is provided in the lower portion of the air balancer 5. A part 5a is provided. The upper part of the upper end opening 2c of the combustion basket 2 and the upper part of the air balancer 5 are open.

Although not shown, a plurality of communication pipes are installed between the storage tank 1 and the combustion basket 2, and each communication pipe burns the gas from the storage tank 1. A pump (not shown) for delivering to the basket 2 is provided.

A pipe-shaped heater 6 for electrically heating is installed at the inner bottom of the receiving tank 1 as a heating means for raising the melting temperature of the wax-like substance C,
In addition, a temperature sensor 7 such as a bimetal or a thermocouple for detecting the melting temperature of the wax-like substance C is installed in the receiving tank 1 as a temperature detecting means.

Further, a control means 8 such as a microcomputer for on / off control or proportional control of the heater 6 is provided, and the control means 8 controls the melt of the wax-like substance C based on the signal from the temperature sensor 7. The heater 6 is controlled so as to maintain the predetermined temperature.

Such a heater 6 is attached to the inner bottom portion 1c of the receiving tank 1, and its shape is divided into three parts so that it can be uniformly heated while meandering, as shown in FIG. It is covered with heat-resistant cement (not shown) to prevent it from falling.

The shape of the heater 6 is not particularly limited to the above as long as it can uniformly heat the heater 6, and other shapes, for example, spiral shapes may be used.
Also, the heater 6 is attached at the wax-like substance C
If it can be heated, it may be provided on the inner wall of the receiving tank 1. Further, the heater 6 can be configured by using high frequency heating instead of electric heating.

Next, a method of manufacturing a wax-like substance using the above manufacturing apparatus will be described. First, referring to FIG.
As shown in Fig. 3, as the raw material A, flammable, for example, highly crosslinked polyethylene and polyolefin or polystyrene such as non-crosslinked, low crosslinked and highly crosslinked polyethylene for producing wax-like substances are mixed and used, and a predetermined amount of the raw material A is used. Put in the combustion basket 2.

After that, the highly crosslinked polyethylene in the raw material A is ignited and burned to melt the synthetic resin for producing the wax-like substance, and a part of the synthetic resin is thermally decomposed into a low molecular weight and liquefied. The melt B, which is a mixture thereof, passes through the catalysts in the catalyst tank 4 and drops into the receiving tank 1 while being dropped from the roster hole portion 3a.

At this time, the catalyst tank 4 and the receiving tank 1
The oxygen inside reacts with the melt B and is rapidly consumed, and the inside of them becomes oxygen deficient. As a result, the non-thermally decomposed or incompletely decomposed melt B is mainly thermally decomposed in the catalyst tank 4 in an oxygen-deficient state to become a low-molecular substance and become a wax-like substance C. The substance C is accumulated in the receiving tank 1 in a molten state. The softening point which is a physical property of the taken out wax-like substance C is 100 to 118 ° C.

The wax-like substance C thus melted into a high heat state is heated by the heater 6,
The melting temperature is controlled by the temperature sensor 7 and the control means 8 so that the melting temperature becomes a predetermined temperature. Therefore, since the melting temperature of the wax-like substance C in the oxygen deficient state is stable, the high-heat gas G such as flammable ethylene gas in which a part of the wax-like substance C is vaporized is stabilized. appear.

Therefore, the high-heat gas G, the amount of which is controlled in this way, rises through the catalyst tank 4 and the rustle 3, and the combustion which is the combustion place of the raw material A through a communication pipe and a pump (not shown). By reaching the basket 2 for combustion and being mixed with the air introduced from the respective air introduction holes 2b ... And burning, the temperature in the basket 2 for combustion is controlled to a desired temperature, and the basket 2 for combustion is continuously charged. The melting and decomposition of raw material A continues.

At this time, particulate carbon is produced from the wax-like substance C in the oxygen-deficient state at the same time as the high-heat gas G, and the fine-particle carbon rises from the storage tank 1 together with the high-heat gas G for combustion. Reach basket 2 At this time, in the combustion basket 2 in which a large amount of air is introduced from the innumerable air introduction holes 2b ... And the upper end opening 2c of the combustion basket 2, and the temperature becomes a desired high temperature, the above-mentioned particulate carbon is Completely burns to carbon dioxide. The internal temperature of the combustion basket 2 is preferably about 1100 ° C. Below this temperature, a large amount of carbon soot is generated, which is undesirable.
If the temperature is much higher than the above temperature, deterioration of the combustion basket 2 is promoted, which is not preferable.

In order to prevent the particulate carbon thus produced from causing combustion failure in the combustion basket 2,
In order to increase the internal temperature of the combustion basket 2 to a desired internal temperature, the melting temperature of the wax-like substance C is controlled so as to optimize the amount of the high-heat gas G generated. The melting temperature of the substance C is set to be about 600 ° C. By burning the particulate carbon produced in this way into carbon dioxide gas, the particulate carbon is prevented from leaking to the outside, and clean exhaust is provided.

By the way, conventionally, since the melting temperature of the wax-like substance in the receiving tank fluctuates depending on the outside air temperature and the amount of high-heat gas generated from the wax-like substance also changes, the internal temperature in the combustion basket also changes. It was fluctuating.

As a result, when the internal temperature of the combustion basket decreases due to a decrease in the amount of combustible raw material, the particulate carbon produced simultaneously with the high-heat gas causes combustion failure inside the combustion basket, and the particulate carbon burns. Soot adhered to the inner wall of the basket and the inner wall of the exhaust tower as carbon soot when it accumulated, and sometimes dropped and mixed into the melt of the wax-like substance.

When the wax-like substance mixed with carbon soot is used for casting, for example, the carbon soot mixed during dewaxing is left in the mold by precipitation and cracks are generated during firing or casting of the mold. It caused the inconvenience of damage.

However, in the structure of the above embodiment, since the heater 6 for adjusting the melting temperature of the wax-like substance C is provided, the amount of the high-heat gas G generated from the wax-like substance C is controlled to generate the fine particles. It is possible to burn all the particulate carbon in the burning basket 2, and it is possible to avoid the conventional carbon soot from adhering to the inside.

Moreover, the wax-like substance C obtained has a relatively high softening point of 100 to 118 ° C. and does not easily soften during processing such as engraving. With wood processing tools, even an amateur can easily perform engraving.

Therefore, the obtained wax-like substance C is free from the inclusion of carbon soot and can be used as a casting wax which is easy for an amateur to handle. Therefore, such a wax-like substance C is used for lost wax casting. In addition, it can be suitably used for casting arts.

Further, such a wax-like substance C is used for various purposes of paraffin wax, such as a compounding agent,
It can also be effectively used as a filler, a filler, an abrasive, a wax for pigments, and the like. In addition, the wax-like substance C is manufactured from waste of synthetic resin such as polyethylene resin, so that the cost is low.

[0042]

As described above, the method for producing a wax-like substance according to the present invention raises the temperature of the melt of the wax-like substance to be produced, and combustible high-heat gas generated from the melt. Is a method of increasing the occurrence of.

Therefore, the above method can raise the combustion temperature in the combustion basket, and the carbon generated together with the combustible gas can be burned and reduced more in the combustion basket.

As a result, carbon, which has conventionally been poorly burned,
Carbon soot was dropped into the wax-like melt in the tank and was mixed therewith, resulting in deterioration of the quality of the wax-like melt, but the above method reduces the mixture of carbon into the obtained wax-like melt. Thus, it is possible to suppress the deterioration of the quality of the wax-like substance produced.

In the apparatus for producing a wax-like substance according to a second aspect of the present invention, as described above, the heating means for heating the wax-like melt is provided in the tank for storing the produced wax-like melt, and the heating is performed. The control means controls the wax-like melt to a predetermined temperature to control the internal temperature of the combustion basket.

Therefore, in the above-mentioned constitution, the melting temperature of the wax-like melt can be raised to enhance the generation of combustible high-heat gas, and more carbon produced along with the generation of combustible high-heat gas is burned in the combustion basket. It is possible to reduce the carbon content.

As a result, conventionally, poorly combusted carbon adheres to the side wall of the apparatus, becomes carbon soot, and falls into the wax-like melt in the tank to be mixed, resulting in deterioration of the quality of the wax-like substance. However, the above configuration has an effect that it is possible to suppress the deterioration of the quality of the wax-like substance to be produced, because such a mixture can be suppressed.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an apparatus for producing a wax-like substance according to the present invention.

FIG. 2 is a front view of the heater of the manufacturing apparatus from above.

FIG. 3 is a schematic cross-sectional view of a conventional apparatus for producing a wax-like substance.

[Explanation of symbols]

 1 Reservoir Tank 2 Combustion Basket 3 Rostrul (Raw Material Receptacle) 4 Catalyst Tank (Pyrolysis Acceleration Basket) 6 Heater (Exothermic Means) 8 Control Means A Raw Material (Waxy Substance-forming Synthetic Resin) C Waxy Substances ( Wax-like melt) G High-heat gas

Claims (2)

[Claims] 1. A synthetic wax having self-combustibility is burned inside a basket for combustion, and the heat of combustion heats and melts the synthetic resin for forming a wax-like substance to cause a thermal decomposition reaction, thereby producing a molten wax-like substance. By dropping the substance into the oxygen-deficient atmosphere in a drop shape, the thermal decomposition reaction is promoted to obtain a wax-like melt, and the flammable high-heat gas generated by the partial decomposition of the wax-like melt during the reaction is generated. In a method for producing a wax-like substance which is returned to the inside of the combustion basket and used as energy for combustion and thermal decomposition, the wax-like melt is heated by a heating means to generate the flammable high-heat gas. The method for producing a wax-like substance, characterized in that the temperature inside the combustion basket is controlled by adjusting the temperature. 2. A combustion basket for heating and melting raw materials is mounted and mounted on an upper end opening of a tank for receiving a waxy melt, and a peripheral wall of the combustion basket. A large number of air introduction holes are provided in the base, and a porous raw material tray on which the above raw materials can be placed is laterally seated on the inner peripheral wall thereof, and at the lower end opening of the combustion basket, an entire peripheral wall has a porous upper end opening. In the wax-like substance manufacturing apparatus in which the above-mentioned basket for promoting thermal decomposition is attached and arranged inside the tank, heating means for heating the wax-like melt is provided in the tank, and inside the basket for combustion. An apparatus for producing a wax-like substance, characterized in that a control means for controlling the heating means is provided so as to keep the temperature at a predetermined temperature.