JP2001294764A - Synthetic resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin composition capable of keeping combustion rate at a condition of a low temperature and a low oxygen concentration during incineration for disposal after it is used as a synthetic resin of original purpose, restraining the quantity of carbon monoxide and nitrogen oxides generated during incineration, lessening the remaining ash and toxic material after incineration as much as possible, and a fuel utilizing the waste plastic and having an excellent combustion character. SOLUTION: This synthetic resin composition contains as impurities not more than 0.8 wt.% total sulfur, not more than 0.5 wt.% total sodium, and the total of the total sulfur and total sodium of not more than 1.0 wt.% and contains 0.1-8.0 wt.% iron oxide particle having an average particle diameter of 0.03-1.0 μm to the synthetic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of maintaining a burning rate even under low temperature and low oxygen concentration conditions when incinerated after being used for various purposes, and is capable of maintaining the combustion rate of monoxide during combustion. The present invention relates to a synthetic resin composition capable of suppressing the amount of carbon and nitrogen oxides and reducing residual ash and harmful substances after incineration as much as possible and a fuel comprising waste plastics and having excellent combustion characteristics.

[0002]

2. Description of the Related Art In recent years, new products have overflowed and rich material culture has been formed due to changes in lifestyles, improvement in living standards and income levels, but industrial waste and garbage discharged from factories and households accompanying this. As the amount of wastewater is rapidly increasing, the problems associated with these treatments have become major social problems.

[0003] In particular, synthetic resins have excellent mechanical properties.
Due to their physical properties and formability, enormous amounts are used in every field as materials that are indispensable in modern society, and the total amount of waste is also in excess of several million tons per year. Therefore, treatment of synthetic resin waste has become a particularly important issue among industrial waste and waste disposal. In addition, since synthetic resin is made from petroleum, a valuable resource given to mankind, it is strongly required to establish a technology to reuse or use it as an energy source even after it has been used once. .

[0004] As for the incineration of combustible waste containing synthetic resin, conventionally, air pollution due to carbon monoxide and nitrogen oxides generated during combustion, landfills that dispose of a large amount of residual ash and unburned residues after incineration, etc. In addition to problems such as shortage of waste, leakage of harmful components in residual ash at landfill sites, and the generation of toxic dioxins, when combustible garbage contains a large amount of synthetic resin waste with high combustion calories, However, there is a problem that the incinerator is easily damaged due to an increase in the temperature inside the incinerator.

[0005] As a method for solving such a problem, for example, a method in which combustion is performed under a low oxygen concentration to suppress the amount of nitrogen oxides, and a method in which the inside of a furnace is controlled to a certain temperature or less by performing combustion while spraying water. Methods for preventing damage to incinerators, methods for insolubilizing residual ash containing harmful substances, solidifying cement, and then landfill disposal have been proposed. Furthermore, regarding plastic garbage bags that are incinerated together with combustible garbage, recently, instead of conventional garbage bags, translucent garbage bags containing a large amount of calcium carbonate in polyethylene have been obliged to reduce garbage. Local governments are also trying to reduce the calories burned.

[0006]

Conventionally, synthetic resin waste is conventionally disposed of in landfills rather than incinerated for the reasons described above. However, various articles made of synthetic resins can be incinerated. And that these are manufactured using petroleum as a raw material, it is strongly demanded from various fields that after use, they can be incinerated and the heat generated during incineration can be effectively used as an energy source. That is. Therefore, in incineration of incinerated materials including synthetic resin waste, technology to reduce the amount of carbon monoxide and nitrogen oxides generated during combustion, prevent damage to incinerators, and minimize the amount of unburned and residual ash Is most needed for the time being, but it cannot be said that the above known method sufficiently satisfies these requirements.

That is, incineration under low temperature and low oxygen concentration conditions is effective for suppressing the amount of nitrogen oxides generated during combustion and preventing damage to the incinerator, but reduces the combustion speed and the residue after incineration due to incomplete combustion. There was a problem that ash and unburned residue further increased. In addition, translucent garbage bags containing a large amount of calcium carbonate in polyethylene resin have a problem that the temperature rise in the incinerator during incineration is small, but the amount of residual ash after incineration increases by an amount equivalent to calcium carbonate. there were.

Accordingly, the present invention can maintain the burning rate even under low-temperature and low-oxygen-concentration conditions when incinerated after being used as a synthetic resin for its intended purpose, and can be generated during combustion. To provide a synthetic resin composition capable of suppressing the amount of carbon monoxide and nitrogen oxides and reducing residual ash and harmful substances after incineration as much as possible, and to provide a fuel having excellent combustion characteristics utilizing waste plastic. Is a technical task.

[0009]

The technical problem can be solved by the present invention as described below. That is, in the present invention, when the total amount of sulfur contained as impurities is 0.8 wt% or less and the total sodium amount is 0.5 wt% or less, and the total amount of the total sulfur amount and the total sodium amount is 1.0 wt% or less, A synthetic resin composition containing 0.1 to 8.0 wt% of granular iron oxide particles having an average particle diameter of 0.03 to 1.0 μm, wherein the synthetic resin is thermoplastic. A synthetic resin composition characterized in that it is a resin, and a BET specific surface area of the granular iron oxide particles is ² to 30 m ² / g.

[0010] That is, by the combustion catalytic function of the ferric oxide particles or iron oxide particles or the mixture of the particles, the total amount of sulfur and the total amount of sodium as impurities are not more than a certain amount, these ferric oxide particles or When incinerated after using a synthetic resin composition containing a synthetic resin containing iron oxide particles or a mixture of the particles, it becomes possible to completely burn, as a result, a reduction in residual ash and unburned, The inventors have found that the amounts of carbon monoxide and nitrogen oxide in the exhaust gas can be suppressed, and have reached the present invention.

Next, various conditions for implementing the present invention will be described. As the synthetic resin used in the present invention, polyethylene, polypropylene, vinyl chloride resin, polyester resin, polystyrene, nylon, polyurethane, thermoplastic resin such as acrylic resin and phenol resin,
Thermosetting resins such as urea resins, epoxy resins, and unsaturated polyester resins can be used without any particular limitation. Among these, it is preferable to apply the present invention to a thermoplastic resin because the catalytic activity of the hydrous ferric oxide particles or iron oxide particles described later is easily exerted. In particular, low density polyethylene, linear low density polyethylene, high density polyethylene, ethylene-
Polyethylene resin products such as polyethylene resin and polypropylene, such as vinyl acetate copolymer, are often used as packaging films and are extremely difficult to separate and collect together with paper and other waste. Therefore, it is preferable to apply the present invention. In addition, as waste plastic used for fuel, used products made of the above-mentioned thermoplastic resin and unsuitable products generated in the production process thereof,
It means a loss or the like, and even if a small amount of dust, foreign matter such as soil, printing ink, pigment, adhesive, and metal is mixed in the waste plastic, it can be used without any problem.

In the present invention, the total sulfur content as impurities is 0.8 wt% or less and the total sodium content is 0.5 wt%
It is necessary to use ferric oxide particles and / or iron oxide particles in which the total amount of sulfur and sodium is 1.0 wt% or less. When the amount of the impurities is large, the combustion catalytic activity of the ferric oxide-containing particles and / or the iron oxide particles becomes small, and the effect of imparting the combustion characteristics aimed at by the present invention is unfavorably small. This means that the total amount of sulfur and the total amount of sodium among the impurities of the ferric oxide-containing particles and / or iron oxide particles affect the area of the contact interface between the particles and the synthetic resin and the magnitude of the combustion catalyst activity per area. It is presumed that this is due to being an important factor. The total sulfur amount is a value measured with a carbon-sulfur analyzer EMIA-2200 manufactured by Horiba, Ltd. The total sodium amount is an inductively coupled plasma atomic emission spectrophotometer SPS manufactured by Seiko Electronic Industry Co., Ltd. It is a value measured with -4000 type.

Further, in the present invention, the particle size distribution of the hydrous ferric oxide particles and / or iron oxide particles is preferably 60% or less. This particle size distribution affects the flammability through the packing structure of particles dispersed in the resin when kneaded into the above-described synthetic resin. The particle size distribution referred to here is a photograph obtained by magnifying a 10,000-fold photograph obtained by a transmission electron microscope four times, and randomly selecting 250 particles, the spindle shape and the needle shape have a long axis diameter, and a plate shape. The shape and granularity are obtained by actually measuring the Feret diameter, obtaining a number distribution from the diameter and the number, multiplying a value obtained by dividing the standard deviation σ of the distribution by the average value M by 100, and expressing the result in%.

Further, the particle shape, average particle diameter and axial ratio of the hydrous ferric oxide particles and / or iron oxide particles are determined based on the area of the contact interface between the synthetic resin and the hydrous ferric oxide particles and / or iron oxide particles. The BET specific surface area, which governs the size and is used as a substitute for the average particle diameter of the particles, determines the maximum value of the contact interface with the synthetic resin corresponding to the case where the particles are most ideally dispersed, and determines the combustion catalyst activity. Acts as a defining factor.

As the hydrous ferric oxide particles in the present invention, any of goethite (α-FeOOH) particles, lipid crocite (γ-FeOOH) particles, and δ-FeOOH particles can be used. May be any of a spindle shape (bamboo leaf shape), a needle shape, a plate shape and the like, but a spindle-shaped hydrous ferric oxide particle is preferred in view of combustion efficiency, and a spindle-shaped goethite particle is particularly preferred. According to electron microscopic observation, the spindle-shaped hydrous ferric oxide particles are particles having an appearance in which many ultrafine fibers are bundled, and have a major axis diameter of 0.05 to 1.5 μm and an axial ratio (major axis). Diameter / short axis diameter-the same applies hereinafter) is 1 to 18 and the BET specific surface area is 30 to 250 m ² / g. Among them, the total sulfur content is 0.
It is preferable that the content of sodium is 2 wt% or less, the total amount of sodium is 0.5 wt% or less, and the particle size distribution is 50% or less. Furthermore, considering the combustion efficiency, the total sulfur content is 0.08 wt%
Hereinafter, the total sodium content is 0.3 wt% or less, the particle size distribution is 40% or less, the major axis diameter is 0.1 to 0.5 μm, the axial ratio is 3 to 15, and the BET specific surface area is 50 m ² / g or more. It is preferred that

The needle-shaped hydrous ferric oxide particles include not only needle-shaped particles but also needle-shaped particles having the appearance of dendrites appearing from some places.
2.0 μm, the axial ratio is 2 to 20, and the BET specific surface area is 10 to 200 m ² / g. Among them, it is preferable that the total sulfur content is 0.1 wt% or less, the total sodium content is 0.5 wt% or less, and the particle size distribution is 60% or less.
Considering the combustion efficiency, the total sulfur content is 0.05 wt% or less, the total sodium content is 0.3 wt% or less, the particle size distribution is 50% or less, the major axis diameter is 0.1 to 0.8 μm, and the Preferably, the ratio is 5 to 15, and the BET specific surface area is 15 to 100 m ² / g.

According to electron microscopic observation, the plate-like hydrous ferric oxide particles have a hexagonal plate-like or disk-like appearance, and have a plate surface diameter of 0.02 to 1.5 μm and a plate-like shape. The ratio (plate surface diameter / thickness-the same applies hereinafter) is about 3 to 15. Among them, the total sulfur content is 0.1 wt% or less, the total sodium content is 0.1 wt% or less, and the particle size distribution is 50% or less.
The following is preferred. Considering the combustion efficiency, the total sulfur content is 0.05 wt% or less, and the total sodium content is 0.0
It is preferable that the content is 5 wt% or less, the particle size distribution is 40% or less, the plate surface diameter is 0.03 to 0.5 μm, and the plate ratio is 5 to 10.

The hydrous ferric oxide particles of these various shapes are:
Neutralization reaction between aqueous ferrous salt solution and aqueous alkali solution such as aqueous alkali hydroxide solution and aqueous alkali carbonate solution An oxygen-containing gas such as air is passed through a suspension containing precipitates in the presence or absence of additives. By doing so, it can be produced from an aqueous solution.

The iron oxide particles used in the present invention include hemata.
(Α-Fe_TwoO_Three) Particles, magnetite (FeOx
Fe_TwoO_Three, 0 <x ≦ 1) particles are maghemite (γ-F
e_TwoO _Three) Any of the particles can be used
The shapes are spindle, needle, plate and spherical, octahedral, polyhedral,
Any of the so-called granular shapes that exhibit an almost isotropic shape such as an irregular shape
May be used, but granular magnetite particles, spindle-shaped
Combustion efficiency of hematite particles and spindle-shaped maghemite particles
Preferred in terms of
Children are most preferred.

The spindle-shaped iron oxide particles and the needle-shaped iron oxide particles have a major axis diameter of 0.03 to 1.0 μm, an axial ratio of 2 to 12, and a BET specific surface area of 5 to 200 m ² / g. . Among them, it is preferable that the total sulfur content is 0.2 wt% or less, the total sodium content is 0.5 wt% or less, and the particle size distribution is 50% or less. Considering the combustion efficiency, the total sulfur content is 0.1 wt% or less, the total sodium content is 0.35 wt% or less, the particle size distribution is 45% or less, and the long axis diameter is 0.05.
0.3 μm, axial ratio 3-10, BET specific surface area 20
Preferably it is １００100 m ² / g.

The average particle diameter of the granular iron oxide particles is 0.03.
１．０1.0 μm, BET specific surface area 2-30 m ² / g. Of these, it is preferable that the total sulfur content be 0.8 wt% or less, the total sodium content be 0.5 wt% or less, and the particle size distribution be 50% or less. Taking combustion efficiency into consideration, the total sulfur content is 0.6 wt% or less, the total sodium content is 0.25 wt% or less, the particle size distribution is 40% or less, and the average particle size is 0.
It is preferable that the BET specific surface area is 0.5 m to 0.5 m and the BET specific surface area is 4 m ² / g or more.

The spindle-shaped iron oxide particles and the needle-shaped iron oxide particles can be obtained by mixing the spindle-shaped hydrated ferric oxide particles and the acicular hydrated ferric oxide particles obtained from the above-mentioned aqueous solution at 250 to 700 ° C. in the air. To obtain spindle-shaped hematite particles or acicular hematite particles, and then these hematite particles are placed in a reducing atmosphere such as under a stream of steam.
By heating the particles while maintaining the particle shape at 0 to 500 ° C. to obtain spindle-shaped magnetite particles or acicular magnetite particles, these magnetite particles can be further reduced to 200 to 500 ° C. in air.
It can be obtained by oxidizing while maintaining the particle shape at 500 ° C. to obtain spindle-shaped maghemite particles or acicular maghemite particles.

The plate-like iron oxide particles are heated in an autoclave to form a plate-like hematite particle by heating a neutralization reaction precipitate of an aqueous ferrous salt solution and an aqueous alkali solution, thereby forming the plate-like hematite particle into a steam stream. In a lower reducing atmosphere 3
By heating the sheet-like magnetite particles while maintaining the particle shape at 00 to 500 ° C., the plate-like magnetite particles are further oxidized in the air while maintaining the particle shape at 200 to 500 ° C. to obtain plate-like maghemite particles. Can be obtained.

The particulate iron oxide particles are obtained by passing an oxygen-containing gas such as air through a suspension containing a precipitate obtained by neutralizing a ferrous salt aqueous solution with an aqueous alkali solution such as an aqueous alkali hydroxide solution or an aqueous alkali carbonate solution. By generating the granular magnetite particles, the magnetite particles are heated in air at 200 to 500 ° C.
The maghemite particles are further heated to 50 g by heating while maintaining the particle shape in the form of granular maghemite particles.
It can be obtained by heating at 0 to 900 ° C. while maintaining the particle shape to obtain granular hematite particles.

The synthetic resin composition of the present invention comprises the above-mentioned synthetic resin containing iron oxide hydroxide particles or iron oxide particles, and the type and content of the iron oxide hydroxide particles or iron oxide particles. Is the color tone according to the purpose and application as a synthetic resin,
It is necessary to select in consideration of mechanical properties and combustion characteristics, and the content is 0.1 to 20.0 wt%. If this content is less than 0.1 wt%, the effect of improving the combustion characteristics of the entire incinerated material in the incinerator is poor, and conversely, 20 wt%
If the ratio exceeds, the physical and mechanical properties of the obtained synthetic resin composition are lowered, and the weather resistance is also deteriorated. Physical, in accordance with the intended use and purpose of the synthetic resin composition,
Considering both mechanical properties and improving the combustion characteristics of the incinerated material, including other combustibles in the incinerator, 0.3
To 10.0 wt%, particularly preferably 0.5 to 8.0 wt%. In this case, the ferric hydroxide particles and the iron oxide particles,
For the purpose of improving the dispersibility in a synthetic resin, the surface of the particles can be surface-treated with various surface treatment agents before use.

The synthetic resin composition of the present invention comprises, for example, a synthetic resin (however, in the case of a thermosetting resin, one before curing or in a prepolymer stage) and ferric oxide-containing particles or iron oxide particles or the particles. Can be manufactured by kneading the mixture with a mixing roll, a Banbury mixer, a kneader, a twin-screw kneading extruder or the like. This synthetic resin composition can be used for various applications by extrusion molding or calender molding, if necessary, into a film or sheet, or by heat-sealing the film or sheet, by secondary processing such as vacuum molding, bags, trays, containers. In addition, extrusion molding,
By injection molding, blow molding, compression molding and cast molding, it can also be molded into molded articles such as daily necessities, electric products, automobiles and other industrial products and parts.

In kneading, various additives such as a lubricant, an anti-blocking agent, an antioxidant, a weathering agent, a coloring agent, etc., which are well-known in the art, may be appropriately blended, if necessary, or various organic and inorganic fillers may be used. Can also be used in combination.

When a waste plastic used as a synthetic resin is used as fuel, the waste plastic and the ferric oxide-containing particles or iron oxide particles or a mixture of the particles are mixed with a mixer such as a ribbon blender. After mixing using, it may be compressed and solidified for use, and may be mixed and kneaded using a well-known kneading machine such as a mixing roll, a Banbury mixer, a kneader, or a twin-screw kneader, It can be used as it is in a molten state, or can be appropriately molded into a preferable shape. At this time, waste plastic is adjusted to adjust the fuel to the calorie suitable for the incinerator, or to prevent the plastic from melting and becoming liquid during combustion and sticking to the incinerator wall to burn and damage the furnace wall. It is preferable that an organic or inorganic filler is further added to the mixture of the iron oxide particles and the iron oxide particles or the mixture of the particles.

[0029]

The present inventor believes that the synthetic resin composition of the present invention exhibits excellent combustion characteristics as follows. When burning a solid incineration material containing a synthetic resin having a hydrocarbon chain in its molecular structure, the incineration material is decomposed by heating, and the resulting combustible low molecular weight gas or vapor is combusted. <Decomposition and combustion> proceeds, but in order for decomposition and combustion to be performed quickly, (1) the incinerated material is immediately decomposed into a combustible low molecular weight gas component or vapor component by the action of heating and oxygen. (2) the generated flammable low molecular weight gaseous or vapor component under a sufficient supply of oxygen while passing through a complex route including elementary reactions via various lower molecular weight intermediates; It is necessary that the two processes of finally being converted into carbon dioxide and water by various active oxygen species such as hydroxyl radicals proceed in a well-balanced manner.

The hydrous ferric oxide particles and iron oxide particles present in the incinerator are stabilized by surface hydroxyl groups formed by the dissociation and adsorption of water to iron atoms on the surface. Dehydration occurs between hydroxyl groups to generate coordinatively unsaturated iron ions and oxygen ions. And the coordinatively unsaturated oxygen ions generated on the surfaces of the ferric hydroxide particles and the iron oxide particles dispersed inside the synthetic resin are mainly composed of organic substances because the supply of oxygen is relatively insufficient. Shows catalytic activity of dehydrogenation reaction and carbon-carbon chain cleavage reaction,
It is considered that the above process (1) is promoted.

In general, if the ratio of the catalytic activities of the dehydrogenation reaction and the carbon-carbon cleavage reaction is not appropriate, the ratio of hydrogen / carbon in the combustible components of the remaining synthetic resin is reduced, resulting in a flammable low molecular weight gas. Although the ratio of decomposition into components or vapor components decreases and it becomes difficult to combust, in the hydrous ferric oxide particles and iron oxide particles used in the present invention, the catalytic activity of the dehydrogenation reaction and the carbon-carbon cleavage reaction is reduced. Is appropriate, and the rate at which the combustible components of the remaining incinerated matter are decomposed into combustible low molecular weight gas components or vapor components is high.

The hydrous ferric oxide particles and iron oxide particles inside the synthetic resin are released into the gas phase as the decomposition and combustion of the incineration proceeds. In the state where the ferric oxide particles and the iron oxide particles are suspended in the gas phase where the supply of oxygen is sufficiently performed,
The coordinatively unsaturated iron ions generated on the surfaces of the ferric oxide particles and the iron oxide particles adsorb oxygen and activate oxygen,
Various active oxygen species are produced to promote the above process (2).

However, the sulfur contained as an impurity in the ferric oxide-containing particles and the iron oxide particles binds to the coordinatively unsaturated iron ions to lower the catalytic activity and behaves as sulfate ions during combustion. The sintering in the interior is promoted to reduce the effective area of the catalytic activity, and similarly, sodium reacts with the components in the residual ash to reduce the catalytic activity.

Therefore, according to the above mechanism, the total sulfur content as impurities of the ferric oxide particles or iron oxide particles or the mixture of the particles in the synthetic resin composition or the fuel is 0.8 wt% or less, and 0.5wt sodium
% Or less, and when the total amount of the total amount of sulfur and the total amount of sodium is 1.0 wt% or less, the process of (1) is activated when iron oxide hydroxide particles or iron oxide particles are used. At the same time, the ferric oxyhydroxide particles and iron oxide particles inside are released into the gas phase with the progress of the decomposition and combustion of the incinerated material, thereby promoting the process (2) to achieve excellent combustion characteristics. It is considered to be effective.

[0035]

EXAMPLES Hereinafter, the combustion characteristics of the synthetic resin composition of the present invention will be described with reference to Examples and Comparative Examples. The combustion characteristics of the synthetic resin composition were evaluated by the following method. The burning rate was measured by weighing 10 mg of the synthetic resin composition and 300 ml.
/ Min in air or under low oxygen concentration (air / nitrogen = 1: 1)
The change in weight when the temperature was raised at a rate of 10 ° C./min in a thermogravimetric analyzer (Seiko Denshi Kogyo Co., Ltd.)
And the time required from the time when the rapid weight loss starts to the time when the rapid weight loss ends (combustion is estimated to occur during this time).

The amount of residual combustible components (it is considered that the smaller the value is, the smaller the amount of unburned residue and ash after incineration is.) In the above measurement, the amount was calculated per combustible component at the time when the rapid weight loss was completed. It was shown by the residual weight ratio (%).

The low-temperature flammability (which is considered to be the temperature required for the organic matter to be completely burned out) is indicated by the temperature at which no weight loss occurs in the above measurement.

Examples 1 to 4, Reference Examples 1 to 6, Comparative Examples 1 to
7 A synthetic resin composition having the composition shown in Table 1 was prepared by melt-kneading using an extruder, and the combustion characteristics were measured. Table 2 shows the results. For comparison, a synthetic resin composition comprising only high-density polyethylene or low-density polyethylene (Comparative Examples 1 and 2) containing no ferric hydroxide particles or iron oxide particles at all, and low-density polyethylene with carbon A synthetic resin composition in which a predetermined amount of black or calcium carbonate is added (Comparative Examples 3 and 4); a synthetic resin composition in which low-density polyethylene is added with spindle-shaped goethite particles of less than 0.1 wt% (Comparative Example 5); Synthetic resin compositions (Comparative Examples 6 and 7) in which low-density polyethylene contains spindle-shaped goethite particles or granular magnetite particles having a large amount of total sulfur and total sodium as impurities are prepared and burned in the same manner as in Examples. The properties were measured. The results are also shown in Table 2.

[0039]

[Table 1]

[0040]

[Table 2]

In Table 2, the synthetic resin composition of the present invention according to the examples has a burning rate and an amount of residual combustible components, as compared with the synthetic resin compositions of Comparative Examples 1 and 2 consisting only of high-density polyethylene or low-density polyethylene. It can be seen that the low temperature combustibility is improved. On the other hand, in the synthetic resin composition of Comparative Example 3 containing carbon black, although the amount of the remaining combustible components was reduced and improved, the burning rate and low-temperature combustibility were reduced as compared with Comparative Example 2, and the composition contained calcium carbonate. It can be seen that the synthetic resin composition of Comparative Example 4 improves the low-temperature combustibility, but reduces the burning rate and does not significantly increase the amount of the remaining combustible components. In addition, it can be seen that if the content of the spindle-shaped goethite particles is less than 0.1 wt% as in the synthetic resin composition of Comparative Example 5, the combustion characteristics are not significantly improved.

Further, spindle-shaped goethite in which the total amount of sodium as an impurity exceeds 0.5% by weight, the total amount of the total amount of sulfur and the total amount of sodium exceeds 1.0% by weight, and the total amount of sulfur exceeds 0.8% by weight. In addition, the synthetic resin compositions (Comparative Examples 6 and 7) containing the particulate magnetite particles in which the total amount of the total sulfur and the total amount of sodium exceeded 1.0 wt% were referred to in Reference Example 2 and Example 1 in which these impurities were small. Had almost no effect of improving the combustion characteristics as compared with the synthetic resin composition of the above.

Reference Examples 7, 8 and Comparative Example 8 Next, a fuel having a composition shown in Table 3 to which wood powder as an organic filler was further added was prepared. And the calorie burned were measured. The results are also shown in Table 3. In addition, these properties were evaluated by the following methods. The state of smoke generation was determined by injection molding or press molding of the fuel composition to create a test piece 30 mm long, 6 mm wide and 3 mm thick, one of which was fixed and held horizontally, and matched to the tip. The state of generation of smoke when ignited and burned was visually evaluated. The melt drop amount was evaluated by measuring the amount of the test piece that melted while burning during the test and dropped, and converted into the drop amount per 1 cm 3 of the test piece. The calorific value was measured by burning the fuel composition in a calorimeter.

[0044]

[Table 3]

As is clear from Table 3, the fuel composition according to the present invention hardly generates smoke and exhibits excellent properties, as compared with the case where the fuel composition of Comparative Example 8 generates smoke. In addition, since wood powder is used as the filler, the calorific value can be adjusted to an appropriate value, and it can be seen that there is no melting and dropping during combustion and that the fuel has excellent characteristics.

REFERENCE EXAMPLE 9 The following test was conducted for the purpose of demonstrating that the incineration of the synthetic resin composition of the present invention has the effect of preventing air pollution and leakage of harmful substances, which were problems in conventional incineration. went. 0.1 g of the incinerated material having the composition shown in Table 4 was burned at a predetermined temperature for 20 minutes while flowing air at 1.0 liter / minute, and the composition of the combustion generated gas was analyzed and the metal was eluted from the residual ash after incineration. The test was performed. Table 5 shows the composition of the combustion gas.
Table 6 shows the results of the metal dissolution test. In this test, the spindle-shaped goethite particles used in Reference Example 1 were used as hydrous ferric oxide particles.

[0047]

[Table 4]

[0048]

[Table 5]

[0049]

[Table 6]

As is clear from the results in Tables 4 to 6, when the incinerated material of Sample B in which spindle-shaped goethite was present as the hydrous ferric oxide particles used in the present invention,
The concentration of carbon monoxide in the gas generated during combustion was lower than that in the case of sample A, and the amount of nitrogen oxide (NOx) generated was also lower under low-temperature combustion conditions such as 800 ° C. In the case of sample B, the amount of carbon recovered as a gas also showed almost the same value as the theoretical amount of carbon in the combustibles of the incinerated material at each temperature of 45%, indicating that combustion was complete. On the other hand, in the case of the sample A, when the temperature became higher than 900 ° C., the generation of soot increased, and the amount of carbon recovered as a gas became smaller than the theoretical value, indicating that the combustion was incomplete. .

Further, from the results of the metal dissolution test, in the case of Sample A, lead and zinc were detected from the residual ash after incineration, whereas none was detected from the residual ash after incineration of Sample B. This indicates that the addition of the ferric oxide particles or the iron oxide particles or the mixture of the particles to the fuel composition has the effect of collecting and insolubilizing heavy metals in the residual ash after incineration.

[0052]

The synthetic resin composition of the present invention is present in a large amount in the natural world and contains certain safe hydrous ferric oxide particles or iron oxide particles. It can be used for its intended purpose and purpose. In the case of incineration after use, the hydrous ferric oxide particles or iron oxide particles exhibit a combustion promoting action, and conventionally, N 2
Even when operating the incinerator under conditions of low temperature and low oxygen concentration, which is effective for suppressing the amount of Ox and preventing damage to the incinerator, the incinerator is completely burned without lowering the combustion efficiency to reduce unburned residue and residual ash. This has the effect that generation can be reduced.

In addition, the effects of reducing the amount of NOx, suppressing the generation of dioxin, and the like can be expected by the inherent combustion promoting action of the ferric oxide particles and the oxide particles. The iron oxide particles react with the oxides of heavy metals during incineration to form ferrite, which has the effect of reducing the solubility of heavy metals in the residual ash in water, thereby eliminating the need for conventional insolubilization treatment.

Furthermore, when waste plastics that are disposed of in large quantities as synthetic resins contain ferric hydroxide particles or iron oxide particles having such an effect, excellent characteristics are obtained that generate less smoke during combustion. It has become possible to effectively reuse waste plastic, which can be used as a fuel and has been difficult to use in the past, as an energy source.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaaki Nishikawa 1515 Nakatsu-cho, Marugame-shi, Kagawa Prefecture Inside Okura Industry Co., Ltd. (72) Inventor Satoshi Saito 1-4 Meiji Shinkai 1-4, Otake City, Hiroshima Prefecture Toda Industry Co., Ltd. Inside the factory (72) Inventor Minoru Osugi 1-4 Meiji Shinkai, Otake City, Hiroshima Prefecture Inside the Otake Factory of Toda Kogyo Co., Ltd.

Claims (3)

[Claims] 1. The method according to claim 1, wherein the total amount of sulfur contained as impurities is 0.
8 wt% or less and total sodium content is 0.5 wt% or less, and the total amount of total sulfur content and total sodium content is 1.0 wt%
% Or less, and the average particle diameter is 0.03 to 1.0 μm
0.1 to 8.0 wt.
% Synthetic resin composition. 2. The synthetic resin composition according to claim 1, wherein the synthetic resin is a thermoplastic resin. 3. The granular iron oxide particles having a BET specific surface area of 2 to 3
The synthetic resin composition according to claim 1, wherein the composition is 0 m ² / g.