JP2003225646A - Method for recycling waste - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an efficient and inexpensive method for recycling waste by which plastic waste is separated from plastic-mixed waste by each category and a plastic composition having low impurity content can be obtained. <P>SOLUTION: This method for recycling the waste being a scrapped product provided with a member consisting of the plastic composition comprises a step to selectively recover the scrapped product provided with the member which consists of the plastic composition of the same category and has specific gravity of a definite range, a step to crush the recovered waste, a step to sort the crushed waste into a metal-based crushed portion, a plastic-based crushed portion and a low-bulk density crushed portion, a step to separate the plastic-based crushed portion into plastic compositions of respective categories by using a plurality of separating liquids different in specific gravity and a step to mold the separated plastic compositions of respective categories into the specified shapes, respectively. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for recycling waste. More specifically, the present invention relates to a method for recycling waste products including a member made of a plastic composition.

The present invention also relates to a waste recycling system used in the above waste recycling method.

Further, the present invention relates to a method for producing a raw material for a plastic composition using the above waste recycling method. The present invention also relates to a method for producing a member made of a plastic composition using the above waste recycling method.

The present invention also relates to a plastic composition raw material produced by the above-mentioned method for producing a plastic composition raw material. The present invention also relates to a member made of a plastic composition produced by the method for producing a member made of the above plastic composition.

[0005]

2. Description of the Related Art In recent years, as the income level in Japan has improved, an air conditioner (also referred to as an air conditioner in this specification), a television receiver (also referred to as a TV in this specification), a refrigerator, a laundry Appliances such as machines, information equipment such as personal computers and word processors, office equipment such as printers and fax machines,
Various other types of furniture, stationery, toys, and the like have become available for general households at a high penetration rate, and convenience in home life is dramatically improving.

On the other hand, as a result, the amount of discarded products such as these home electric appliances tends to increase year by year. Here, conventionally, the recycling of waste products such as these home electric appliances has often been carried out through an iron scrap collection route.

However, in recent years, the constituent materials of the members of various products such as home electric appliances have changed, the members made of metals such as iron have decreased, and the ratio of members made of plastic compositions has increased. It is in. Plastic compositions have a greater degree of freedom in design than metals such as iron, and can be provided with various properties that are difficult to achieve with metals, such as by adjusting the components and using additives.
This is because it has many advantages such as being lightweight and highly durable.

In the waste products of various products such as home electric appliances in recent years, the material composition of various constituent members is complicated, and the ratio of members made of valuable metals such as iron and copper is small, so Since the ratio of parts made of plastic compositions, which are low in properties and require a great deal of labor and cost in the conventional treatment methods, is large, even if such waste materials are recycled in the conventional iron scrap recovery route. As it is not profitable, it is becoming difficult to deal with it.

[0009] Many of the members made of these plastic compositions are synthesized from a reserve fossil fuel such as crude oil as a basic raw material, and from the viewpoint of effective utilization of resources, members made of these plastic compositions are provided. In recent years, it has been strongly demanded to promote the recycling of recycled products.

[0010] In addition, carbon dioxide and sulfur oxides are released from the combustion of reserve fossil fuels such as crude oil, global warming is caused, environmental damage such as acid rain is caused, and dioxin is produced by incineration of a plastic composition containing a chlorine compound.
Also from the viewpoint of suppressing the environmental pollution such as scattering, and the problem of the shortage of the garbage landfill site due to the increase of the waste containing the bulky plastic composition, the disposal of the products including the members made of these plastic compositions. Resource recycling is becoming an important and urgent issue.

In the present specification, a member made of a plastic composition is also called a plastic member. Further, in the present specification, a product including a plastic member is also referred to as a plastic product. further,
In the present specification, waste of plastic products is also referred to as plastic waste.

Under the above circumstances, the Home Appliance Recycling Law came into effect in April 2001. Here, according to the Home Appliance Recycling Law, as of January 2002, it is obligatory to recycle four items of home appliances, such as air conditioners, TVs, refrigerators, and washing machines. % Or more, TV 55
% Or more, refrigerator 50% or more, washing machine 50% or more are set as legal standard values.

However, plastic products such as these home electric appliances generally have a plurality of plastic members, and the plastic members often have different plastic composition materials. It is often a composite member.

In the present specification, a member made of a plurality of plastic compositions made of different materials or a composite member made of plastic compositions made of different materials is also referred to as a mixed plastic member. Further, in the present specification, a product including a mixed plastic member is also referred to as a mixed plastic product. Further, in the present specification, the waste of mixed plastic products is also referred to as mixed plastic waste.

Here, in order to process the mixed plastic members contained in these mixed plastic wastes again and use them as members of various mixed plastic products such as home electric appliances or raw materials thereof, these mixed plastics are used. It is necessary to separate the members for each system of the plastic composition and then process them again.

In this specification, as described above,
The process of treating wastes and then re-processing them into product members or their raw materials for use is called material recycling, in contrast to thermal recycling.

On the other hand, many of the conventionally proposed methods for recycling plastic waste are methods of separating plastic waste containing only a plastic composition of a single material by manual dismantling and recycling it. . However, such a method of separating by manual dismantling and recycling is problematic in that much labor and cost are required. Further, there is a problem that such a method cannot handle mixed plastic waste.

As a method for avoiding such a problem, a so-called thermal method is used in which a mixed plastic member is separated from a mixed plastic waste and used as a fuel without separating the plastic composition by system. Many recycling methods have been proposed in the past.

As a method for recycling the mixed plastic waste by thermal recycling in this manner, for example, Japanese Patent Laid-Open No. 6-226242 discloses a mixed plastic member separated from the mixed plastic waste in a pyrolysis furnace. A method is disclosed in which carbonization by heating is carried out and cracking gas and oil are used as fuel.

However, according to this method, although the mixed plastic waste can be recycled by thermal recycling, there is a problem such as the generation of carbon dioxide gas due to combustion, so that the method sufficiently meets social demands. It cannot be said that.

Therefore, many efforts have been made in various fields to develop a method for separating the mixed plastic member from the mixed plastic waste and further separating the mixed plastic member for each system of the plastic composition. .

For example, in Japanese Unexamined Patent Publication No. 6-63944, when separating a mixture of waste plastics into a high specific gravity material and a low specific gravity material in a liquid due to a difference in specific gravity, the waste plastic to be treated is subjected to a wettability imparting treatment. Disclosed is a method for separating and collecting waste plastic.

However, this method has a problem that it is difficult to separate the mixed plastic members according to the system of the plastic composition when the ranges of the specific gravities of the mixed plastic members composed of the plastic compositions of different systems overlap. .

Further, in JP-A-8-80528, after waste plastics are sorted into two or more kinds by utilizing the difference in specific gravity of plastics, at least one group of the sorted products sorted in this sorting step is plastics. Disclosed is a plastic sorting method characterized by crushing and utilizing the difference in the embrittlement temperature to sort and further classify.

However, also in this method, when the mixed plastic members composed of plastic compositions of different systems have the same specific gravity range and brittle temperature range, the mixed plastic members are separated according to the system of the plastic composition. The problem is that it is difficult. Further, since a cooling process is required, there is a problem that energy consumption is large and processing costs are disadvantageous.

Further, JP-A-9-193154, JP-A-10-315231, and JP-A-2000-246.
No. 136, No. 2000-246735, No. 2000-246736, No. 2001-96.
No. 261, JP-A-2001-212824, and JP-A-2001-328120 also partially improve the method of separating a mixture of waste plastics into a high specific gravity material and a low specific gravity material in a liquid by a specific gravity difference. Is disclosed.

However, even in these methods, it is difficult to separate the mixed plastic members by the system of the plastic composition when the ranges of the specific gravities of the mixed plastic members composed of the plastic compositions of different systems overlap. It is hard to say that it has been overcome.

In Japanese Patent Laid-Open No. 10-258427, a specific gravity separator using a specific gravity liquid is used, waste plastic is put into the specific gravity separator, and the specific gravity liquid is heated to a constant temperature to obtain polyethylene. A method for granulating polyethylene and polypropylene granules by separating polyethylene and polypropylene from waste plastics containing polypropylene and polypropylene by utilizing the difference in melting temperature and molding to a predetermined particle size is disclosed. .

However, even in this method, when the mixed plastic members made of plastic compositions of different systems have the same specific gravity range and melting temperature range, the mixed plastic members are separated according to the system of the plastic composition. There is a problem that it is difficult to do. Further, since a heating step is required, there is a problem that energy consumption is large and processing costs are disadvantageous.

[0030]

As described above, it is possible to obtain a plastic composition which is separated from mixed plastic waste for each system and has a low impurity content,
Furthermore, at present, an efficient and low-cost method for producing a plastic member or a raw material thereof from the plastic composition has not yet been realized.

Based on the above situation, the object of the present invention is to obtain a plastic composition which is separated from mixed plastic waste by system and has a low content of impurities. Furthermore, from the plastic composition, a plastic composition can be obtained. An object of the present invention is to provide an efficient and low-cost waste resource recycling method capable of producing a raw material or a plastic member.

Another object of the present invention is to provide a waste recycling system for use in the above waste recycling method.

Still another object of the present invention is to provide a method for producing a plastic composition raw material using the above method. Another object of the present invention is to provide a method for producing a member made of a plastic composition using the above method.

Another object of the present invention is to provide a plastic composition raw material which is produced by the above method and has a low content of impurities separated for each system.

Still another object of the present invention is a member made of a plastic composition produced by the above method and having a low content of impurities separated for each system.

[0036]

In order to solve the above problems, the inventors of the present invention have prepared a mixed plastic characterized in that the specific gravity of the members made of the plastic composition of the same system is within a certain range in advance. Inspired by the idea that waste should be collected selectively, in order to develop a method for recycling such waste, many types of waste that combine a collection process, separation process, treatment process, etc. We conducted experiments on the recycling method and conducted intensive studies.

At the end of the study, the present inventors selectively collected mixed plastic waste, which was characterized in that the specific gravity of the members made of the plastic composition of the same system was within a certain range. By crushing the plastic parts contained in those wastes and then separating the plastic compositions of the same system by utilizing the difference in specific gravity of those plastic compositions, high quality plastic parts or their raw materials can be produced. The inventors have found that it can be done and completed the present invention.

That is, the method for recycling waste according to the present invention is a method for recycling waste for a product provided with a member made of a plastic composition. A step of selectively collecting waste of a product provided with a member made of a plastic composition, characterized in that the specific gravity of the member is within a certain range,
As a step B, a step of crushing the waste, a step C, a step of sorting the crushed waste into a metal crushed material, a plastic crushed material, and a low bulk density crushed material, and a D type plastics method. It is characterized in that it comprises a step of separating the crushed material by system using a plurality of separation liquids having different specific gravities, and a step F, a step of molding the plastic composition separated by system into a specific shape. And

[0039] Here, in the waste recycling method of the present invention, in the product selectively recovered in the step A,
The member made of a plastic composition is selected from the group consisting of a member made of a polyolefin-based plastic composition, a member made of a polystyrene-based plastic composition, and a member made of another type of plastic composition.
The specific gravity of the member made of the polyolefin plastic composition is 0.85 to 1.00, and the specific gravity of the member made of the polystyrene plastic composition is 1.00 to 1.08. It is preferable that the specific gravity of most of the members made of the other type of plastic composition is in the range of 1.08 to 2.00.

In the waste recycling method of the present invention, in the step D, the X-separated liquid having a specific gravity of 1.01 to 1.08 and a specific gravity of 0.92 to 1.00. It is desirable to separate the crushed plastics according to the system of the plastic composition using the Y separation liquid in the range.

Further, in the waste recycling method of the present invention, in step D, a member made of a polyolefin-based plastic composition and a member made of a polystyrene-based plastic composition using the X-separated liquid, and other systems. It is recommended to separate the member made of the polyolefin-based plastic composition and the member made of the polystyrene-based plastic composition by using the Y separation liquid after separating the member made of the plastic composition of (1).

In the waste recycling method of the present invention, between the steps D and F, as a step E, a plastic composition of a different system mixed with the plastic composition separated by system is mixed with an organic material. It is preferable to have a step of separating using a solvent.

In the waste resource recycling method of the present invention, it is desirable that the organic solvent in step E contains tetrahydrofuran.

Further, in the waste recycling method of the present invention, in step F, the thermoplastic plastic composition of the plastic compositions separated according to the system is melted and then molded into a specific shape. Recommended.

In the waste recycling method of the present invention, in the step F, the thermoplastic composition of the plastic compositions separated according to the system and the unused thermoplastic composition of the same system are used. After being mixed and melted, they may be molded into a specific shape.

In the waste recycling method of the present invention, in step F, the thermoplastic plastic composition is preferably a polyolefin plastic composition. Further, in the waste recycling method of the present invention, in the step F, the thermoplastic composition may be a polystyrene plastic composition.

Further, in the waste recycling method of the present invention, the plastic composition of the same system is formed by recognizing the mark described and / or attached to the discarded product in the step A. It is desirable to selectively collect waste of products provided with a member made of a plastic composition characterized in that the specific gravity of the member is within a certain range.

Further, in the waste recycling method of the present invention, it is recommended that the product provided with the member made of the plastic composition is a product selected from the group consisting of air conditioners, televisions, refrigerators and washing machines. To be done.

The present invention also provides a waste recycling system used in the above waste recycling method, comprising:
As a mechanism, a mechanism for crushing waste, and a C mechanism,
Mechanism for separating crushed waste into metal-based crushed material, plastic-based crushed material, and low bulk specific gravity crushed material, and as D mechanism, plastic composition using a plurality of separated liquids having different specific gravities The system for separating waste by system and the system F for forming a plastic composition separated by system into a specific shape are included in the waste recycling system.

Here, in the waste recycling system of the present invention, the mechanism D has a specific gravity separator having a mixing and stirring tank filled with the X separated liquid having a specific gravity of 1.01 to 1.08. And Y having a specific gravity of 0.92 to 1.00
It is preferable that the mechanism includes a specific gravity separator having a mixing and stirring tank filled with the separated liquid.

Further, in the waste recycling system of the present invention, in the mechanism D, the specific gravity separator is filled with the means for supplying the crushed plastic material, the means for supplying the separation liquid, and the separation liquid. It is desirable to have a mixing and stirring tank, a means for collecting the crushed plastic material that floats on the liquid surface of the separated liquid, and a means for collecting the crushed plastic material that precipitates on the bottom of the mixing and stirring tank.

In addition to the above-mentioned mechanism, the waste resource recycling system of the present invention further comprises, as the E mechanism, a plastic composition of a different system mixed with the plastic composition separated by the D mechanism. Further, it is preferable to have a mechanism provided with a separation device having a mixing and stirring tank filled with an organic solvent for further separation.

Further, in the waste recycling system of the present invention, it is recommended that the F mechanism is a mechanism equipped with an extrusion molding device.

Here, the present invention includes a method for producing a plastic composition raw material using the above-mentioned waste recycling method. The present invention also includes a method for producing a member made of a plastic composition, which uses the above method for recycling waste.

Furthermore, the present invention includes a plastic composition raw material produced by the above-mentioned method for producing a plastic composition raw material. Here, the plastic composition raw material of the present invention is preferably in the form of pellets.

The present invention also includes a member made of the plastic composition produced by the above method for producing a member made of the plastic composition. Here, the member made of the plastic composition of the present invention is preferably used for a product selected from the group consisting of an air conditioner, a television, a refrigerator and a washing machine.

[0057]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail by showing embodiments.

<Waste Recycling Method> The waste resource recycling method of the present invention is a method for recycling waste products including a member made of a plastic composition. The specific gravity of the members made of the plastic composition of the same system is within a certain range, the step of selectively collecting the waste of the product having the members made of the plastic composition, and the step B, the disposal. A step of crushing the material, a step C, a step of selecting the crushed waste into a metal crushed material, a plastic crushed material and a low bulk specific gravity crushed material, and a D step, the plastic crushed material of a specific gravity It is characterized in that it includes a step of separating the plastic composition by system using a plurality of different separation liquids, and a step F, a step of molding the plastic composition separated by the system into a specific shape.

<Plastic Member Included in Wastes of 4 Items of Home Appliances> In the waste recycling method of the present invention,
It is recommended that the product provided with the member made of the plastic composition is a product selected from the group consisting of an air conditioner, a television, a refrigerator and a washing machine.

Here, air conditioners, televisions, refrigerators, washing machines (in the present specification, discarded as used products)
Representative examples of the range of the composition ratio and the specific gravity of the plastic composition of the plastic crushed material recovered from four household appliances (also referred to as four items) will be described with reference to Tables 1 and 2.

Table 1 shows a typical example of the composition ratio of the plastic composition used for the plastic members used in the four items of home appliances by system. Table 2 shows a typical example of the range of the specific gravity of the plastic composition for each major system.

[0062]

[Table 1]

[0063]

[Table 2]

As is clear from these tables, the proportion of the polyolefin-based plastic composition and the polystyrene-based plastic composition in the plastic parts of the four household appliances is generally more than 60% by mass.

Therefore, if at least the plastic member composed of the polyolefin-based plastic composition and the polystyrene-based plastic composition among the plastic members of the four household appliances can be material-recycled, the recycling rate of the plastic members of the four household appliances is 60.
It can be said that it exceeds%.

Further, as is apparent from these tables, the range of specific gravity of the polyolefin-based plastic composition used in large quantities in four items of household appliances is generally 0.85 to
It can be seen that it is included in the range of 1.00. Moreover, it is understood that the range of the specific gravity of the polystyrene plastic composition is generally included in the range of 1.00 to 1.08. Most of the members made of other types of plastic compositions generally have a specific gravity of 1.08 to 2.00.
It turns out that it is included in the range of.

In the present specification, when the term "plastic composition" is used, not only a plastic composition in a narrow sense is shown, but also a plastic composition in a broad sense including a rubber composition, a polymer composition and the like. It shall indicate an object.

From the above, generally, by using a separation liquid having a specific gravity of 1.01 to 1.08, a member made of a polyolefin-based plastic composition and a polystyrene-based plastic composition and other It is understood that it is possible to separate most of the members made of the plastic composition of the above system.

From the above, generally, the specific gravity is 0.
It is understood that it is possible to separate the member made of the polyolefin-based plastic composition and the member made of the polystyrene-based plastic composition by using the separating liquid in the range of 92 to 1.00.

<Waste Recovery Step> In the waste resource recycling method of the present invention, in step A, the plastics are characterized in that the specific gravity of the members made of the plastic composition of the same system is within a certain range. The method includes the step of selectively collecting the product waste provided with the member made of the composition.

Here, in the method for recycling waste according to the present invention, in the product selectively recovered in the step A,
The member made of a plastic composition is selected from the group consisting of a member made of a polyolefin-based plastic composition, a member made of a polystyrene-based plastic composition, and a member made of another type of plastic composition.
The above members are preferable.

Here, Table 3 shows typical examples of specific gravities by type of the members made of the polyolefin-based and polystyrene-based plastic compositions used for the plastic members used in the four items of home electric appliances.

[0073]

[Table 3]

As shown in Table 3, by utilizing such measures as converting a plastic composition of a type out of the range of the specific gravity to a substitute material, a polyolefin-based resin used for a plastic member used in four items of home appliances is used. The specific gravity of the member made of the plastic composition is unified in the range of 0.85 to 1.00 and 1.08 or more, and similarly, the specific gravity of the member made of the polystyrene plastic composition is unified in the range of 1.01 or more. Therefore, when the crushed materials of the mixed plastic members of both systems are separated by utilizing the difference in specific gravity,
It is possible to reduce the mixture of plastic members of both systems.

As a result, the quality of the member or raw material thereof made of the polyolefin-based plastic composition and the polystyrene-based plastic composition material-recycled by the waste recycling method of the present invention can be significantly improved, and further applications can be achieved. Can be expanded.

Therefore, the specific gravity of the member made of the polyolefin-based plastic composition is preferably 0.85 or more, and more preferably 0.88 or more. Furthermore, this specific gravity is preferably 1.00 or less, and more preferably 0.92 or less. When this specific gravity is less than 0.85, the rigidity tends to be low, and when this specific gravity exceeds 1.00, there is a tendency that it is difficult to recycle because there are many inorganic fillers.

The specific gravity of the member made of the polystyrene plastic composition is preferably 1.01 or more, more preferably 1.03 or more.
Further, this specific gravity is preferably 1.08 or less,
In particular, it is more preferably 1.06 or less. If the specific gravity is less than 1.00, the rigidity tends to be low, and if the specific gravity exceeds 1.08, it tends to be difficult to recycle because there are many inorganic fillers.

Furthermore, the specific gravity of most of the members made of the other plastic compositions is preferably 1.08 or more, and more preferably 1.10 or more.

As shown in Table 3, the specific gravity is 1.0
When a polyolefin-based plastic composition of 8 or less and a polystyrene-based plastic composition are recovered and material is recycled, it is not necessary to use a substitute material for the member made of the plastic composition having a specific gravity of 1.08 or more. .

This is because a member made of a plastic composition having a specific gravity of 1.08 or more can be used for thermal recycling together with other resins.

Another reason is that the amount of the members made of the polyolefin-based plastic composition and the polystyrene-based plastic composition having a specific gravity of 1.08 or more is extremely small among the four household appliances. For example, a TV cabinet uses a large amount of members made of a polystyrene plastic composition having a specific gravity of about 1.2. However, since it is sorted and separately collected in the process A, some plastic crushed materials are Do not mix.

Further, in the waste recycling method of the present invention, the plastic composition of the same system is formed by recognizing the mark described and / or attached to the discarded product in step A. It is desirable to selectively collect waste of products provided with a member made of a plastic composition characterized in that the specific gravity of the member is within a certain range.

Here, the method of recognizing the mark described and / or attached to the discarded product may be the naked eye or the automatic recognition device.

The mark described and / or attached to the discarded product is not particularly limited, but it can be easily recognized by the naked eye or an automatic recognition device to exert its own identification function. However, for example, a specific figure, a specific numerical value, a specific symbol, a specific character, a specific pattern, a specific color, a specific barcode, or a combination thereof can be used.

Further, this mark may be a flat one or a three-dimensional one, may be directly written on the discarded product, or may be written on a sticker-shaped sheet and discarded. May be attached to the product. Alternatively, it may be described in a special ink that develops a color upon irradiation with, for example, ultraviolet rays.

This mark is described and / or attached only to a product provided with a member made of a plastic composition characterized in that the specific gravity of the member made of a plastic composition of the same system is within a certain range. Must have been

Then, the description of this mark on the product and / or
Alternatively, the attached time may be any stage such as a manufacturing stage, a shipping stage, a selling stage, a disposal stage, a collecting stage, etc. of the merchandise, but the description and / or attachment should be made especially at the manufacturing stage or shipping stage Is preferred.

Further, by recognizing this mark with the naked eye or an automatic recognition device, it is preferable that the composition ratio and the range of specific gravity of the plastic composition constituting the product can be easily read.

<Waste Crushing Step> The waste resource recycling method of the present invention includes, as the step B, a step of crushing the waste.

Here, in the step B, the waste containing the plastic member is not particularly limited, but is preferably crushed by, for example, a crusher or a shredder.

The particle size of the crushed waste is 10 m
It is preferably m or more, and more preferably 40 mm or more. The particle size is preferably 80 mm or less, and particularly preferably 60 mm or less.

This particle size is less than 10 mm or 80 mm
If the particle size exceeds 10 mm, the metal selection accuracy in the next step tends to decrease. Further, if the particle size is less than 10 mm, crushing requires a long time and the plastic melts or deteriorates due to thermal oxidation. Tend to wake up,
If this particle size exceeds 80 mm, the bulk specific gravity tends to be small, and the workability in the subsequent steps tends to be adversely affected.

Before the step B, it is possible to disassemble the large-sized metal members such as the compressor and the heat exchanger, which are difficult to be crushed, in advance and remove them from the waste containing the plastic members. .

<Selection step of metal-based crushed material> In the waste recycling method of the present invention, the crushed waste is divided into a metal-based crushed material, a plastic-based crushed material, and a low bulk specific gravity crushed material in step C. Including the step of selecting.

Here, in the step C, the low bulk specific gravity crushed material is not particularly limited, but it is preferable to select using, for example, wind power. The low bulk specific gravity crushed product means a crushed product having a bulk specific gravity of 0.3 or less. Specific examples of the low bulk specific gravity crushed product include, but are not limited to, a crushed product of a polyurethane heat insulating material and a crushed product of styrene foam.

In step C, the iron-based metal of the metal-based crushed material is not particularly limited, but it is preferable to select it by using magnetic force, for example. Furthermore, C
In the process, the aluminum-based metal and the copper-based metal among the metal-based crushed materials are not particularly limited, but it is preferable to select using, for example, eddy current.

Further, when the crushed waste is sorted into a metal-based crushed material, a plastic-based crushed material and a low bulk density crushed material, when sorting by wind force, sorting by magnetic force, sorting by eddy current, The order is not particularly limited, but from the viewpoint of the efficiency of selection, first the iron-based metal is separated by the magnetic force, then the aluminum-based metal or the copper-based metal is selected by the eddy current, and then the low volume is reduced by the wind force. It is preferable that the crushed product of specific gravity is selected, and the remaining crushed product of the mixed plastic system is transferred to the following separation step based on the difference in specific gravity of the plastic composition.

<Separation Step of Plastic Composition by Difference in Specific Gravity> In the waste recycling method of the present invention, the plastic crushed material is used as a plastic composition system by using a plurality of separation liquids having different specific gravities as Step D. It includes the step of separating separately.

Here, in the step D, it is preferable to separate the plastic crushed material by the system of the plastic composition by using two kinds of X separation liquid and Y separation liquid having different specific gravities.

The specific gravity of the X separated liquid is preferably 1.00 or more, and more preferably 1.01 or more. Further, this specific gravity is preferably 1.10 or less, and more preferably 1.08 or less. When the specific gravity is less than 1.00, the polyolefin plastic tends to be mixed, and when the specific gravity exceeds 1.10, polyamide, polycarbonate, rubber or the like tends to be mixed.

Further, the specific gravity of the Y separated liquid is preferably 0.92 or more, and more preferably 0.95 or more. The specific gravity is preferably 1.01 or less, and more preferably 1.00 or less. If the specific gravity is less than 0.92, a part of the polyolefin-based plastic tends to settle and the recovery rate tends to decrease. If the specific gravity exceeds 1.01, a part of the polystyrene-based plastic is mixed. Tends to.

In step D, the order is not particularly limited, but a member made of a polyolefin-based plastic composition and a member made of a polystyrene-based plastic composition using the X-separated liquid and plastics of other systems are used. After separating the member made of the composition, Y
It is preferable to separate the member made of the polyolefin-based plastic composition and the member made of the polystyrene-based plastic composition by using a separating liquid.

<Plastic Composition Molding Step> The waste recycling method of the present invention includes, as Step F, a step of molding the plastic composition separated according to the system into a specific shape.

Here, between the D step and the F step,
As the step E, it is preferable to have a step of separating a different type of plastic composition mixed in the plastic composition separated according to the type with an organic solvent or the like in advance before molding.

In the step E, the organic solvent that can be preferably used for separating the mixed heterogeneous plastic composition is not particularly limited, and examples thereof include dichloromethane, tetrahydrofuran, toluene, methyl ethyl ketone, and methyl acetate. Can be used. Among these organic solvents, an organic solvent containing tetrahydrofuran is particularly preferable.

Further, in this case, for example, when a different type of plastic composition is mixed in the polystyrene type plastic composition, the mixed different type plastic composition is prepared by mixing the polystyrene type plastic composition with the above organic solvent. After dissolution, a solid material is separated by performing an operation called filtration.

On the contrary, for example, when the mixed different type plastic composition is a polystyrene type plastic composition, it may be separated by dissolving the polystyrene type plastic composition with the above organic solvent.

Further, in the step F, it is preferable to perform material recycling by melting the thermoplastic plastic composition among the plastic compositions separated by system and then molding it into a specific shape. In this case, it is desirable that the plastic composition of the system which is not material recycled is used as a fuel for thermal recycling after being oiled or solidified.

Further, in the step F, a thermoplastic composition of the plastic compositions separated according to the system and an unused thermoplastic composition of the same system are mixed and melted, and then a specific shape is obtained. It is preferable to mold into. At this time, it is desirable to appropriately adjust the amount of the unused thermoplastic composition to be added depending on the purpose of material recycling.

In the waste recycling method of the present invention, the thermoplastic composition to be material recycled in the F step is not particularly limited, and the specific gravity of the separation liquid used in the D step is appropriately selected. By doing so, it is possible to material-recycle any conventionally known thermoplastic composition.

Specific examples of the thermoplastic resin composition that is material-recycled in the step F include polyolefin type, polystyrene type, polycarbonate type,
Examples thereof include plastic compositions such as polymethylmethacrylate. Among these, polyolefin-based plastic compositions such as polyethylene-based and polypropylene-based, and polystyrene-based and ABS-based polystyrene-based plastic compositions include other thermoplastic plastic compositions as shown in Table 4 below. Processability compared to
Since it is excellent in terms of economy, it is possible to suitably material-recycle in the method for recycling waste according to the present invention.

[0112]

[Table 4]

The characteristics of the main plastic compositions shown in Table 4 were evaluated according to the following criteria. ◯: Excellent Δ: Neither can be said ×: Poor In addition, in the F step, it is necessary to recycle the material by heating and melting the thermoplastic composition.

Therefore, when the melting point of the thermoplastic composition is T ° C., the heating temperature at this time is preferably T ° C. or higher, and more preferably (T + 10) ° C. or higher. The heating temperature at this time is (T + 1
20) It is preferable that the temperature is not higher than C, especially (T + 80)
More preferably, the temperature is not higher than ° C. If the heating temperature at this time is lower than T ° C., the thermoplastic composition may not be sufficiently melted and thus tends to be difficult to mold.
If the heating temperature at this time exceeds (T + 120) ° C., the thermoplastic composition tends to be thermally deteriorated.

<Procedure of Recycling Method of Waste> Here,
The method for recycling waste according to the present invention will be described in more detail with reference to specific examples of material recycling of polyolefin-based and polystyrene-based plastic compositions as shown in FIGS. 1 and 2.

First, as shown in FIG.
Four used home appliances discarded from homes are collected (step 101). Then, the wastes of the four items of home appliances are disassembled, and large-sized metal parts such as a compressor and a heat exchanger are collected for each part (step 102).

Next, in step B, the remaining members of the waste of the four items of home appliances from which large metal parts and the like have been collected are roughly crushed to about 60 mm by a large crusher (step 103).

Subsequently, in step C, the crushed materials of the waste items of the four household appliances are sorted into a metal-based crushed material and a plastic-based crushed material by a metal sorter (step 104), and iron, copper, aluminum and the like are sorted. After recovering the metal, the polyurethane heat insulating material and the expanded polystyrene are removed from the crushed plastic material using a wind separator (step 105).

Then, in step D, the plastic crushed material is subjected to specific gravity separation using a specific gravity liquid having a specific gravity of 1.08, for example, an aqueous solution of sodium chloride (step 106), and the polyolefin plastic composition and the polystyrene plastic composition are The mixed crushed product of the polyolefin-based plastic composition and the polystyrene-based plastic composition separated in step 106 from the plastic composition of the above system is a polyolefin-based plastic using a specific gravity liquid having a specific gravity of 1.00, for example, water. The composition and the polystyrene plastic composition are separated (step 107).

Next, as shown in FIG.
The crushed products of the polyolefin-based plastic and polystyrene-based plastic compositions separated in FIG. 1 were each crushed to about 10 mm (step 20).
1), wash and remove the adhering foreign matter (step 2
02). Further, the washed crushed products of the respective plastic compositions are homogeneously mixed (step 203) and heat-molded (step 204) to obtain a pellet-shaped molding resin material (step 205). Then, the pelletized resin raw material is put into an injection molding machine to form a molded body (step 206).

The method for recycling waste according to the present invention does not need to include all of the steps shown in FIGS. 1 and 2.
A step of recovering plastic waste, a step of crushing the plastic waste, a step of separating a metal crushed material and a low bulk density crushed material from the plastic crushed material, and a step of separating the separated plastic waste It suffices to include at least a step of separating a crushed plastic material mainly composed of a thermoplastic composition and a step of material recycling the thermoplastic composition.

Further, the waste resource recycling method of the present invention may include steps not shown in FIGS. 1 and 2 if necessary.

For example, the above-mentioned step E is added, and the plastic composition of a different system mixed in the plastic composition separated according to the system in the step D is further separated using an organic solvent, and the process is transferred to the step F. Good.

<Waste Resource Recycling System> The waste resource recycling system according to the present invention is a waste resource recycling system used in the above-described waste resource recycling method according to the present invention. The mechanism is a mechanism for crushing waste, the C mechanism is a mechanism for selecting crushed waste into metal-based crushed materials, plastic-based crushed materials, and low bulk density crushed materials, and D- mechanism is a plastic-based crushed material. A mechanism for separating the plastic composition by system using a plurality of separation liquids having different specific gravities, and a mechanism for forming the plastic composition separated by the system into a specific shape as the F mechanism. To do.

Here, the mechanism B is not particularly limited, and an apparatus generally used for crushing a member made of a metal or a plastic composition can be preferably used. Specific examples of the crushing device used for the B mechanism include an impact crushing device and a shear crushing device.

Here, the mechanism C is not particularly limited, and an apparatus generally used for selecting metal-based crushed materials and low bulk density crushed materials can be preferably used.

Specific examples of the metal crushed material sorting apparatus used for the C mechanism include a sorting apparatus using magnetic force suitable for iron selection, a sorting apparatus using eddy current suitable for aluminum and copper sorting, For example, a trommel device which makes the particle size uniform and sifts it can be used.

Specific examples of the low bulk density crushed material sorting device used in the C mechanism include a sorting device using wind force and a device using a vibrating sieve.

Here, it is preferable that the mechanism D is a mechanism equipped with a specific gravity separator having a mixing and stirring tank filled with two separated liquids having different specific gravities. Here, the two separation liquids having different specific gravities will be referred to as an X separation liquid and a Y separation liquid.

In this case, the specific gravity of the X separated liquid is preferably 1.00 or more, and more preferably 1.01 or more. Further, the specific gravity of the X separated liquid is preferably 1.10 or less, and particularly preferably 1.08 or less. When the specific gravity of the X separated liquid is less than 1.00, the polyolefin plastic tends to be mixed, and when the specific gravity of the X separated liquid exceeds 1.10, the polyamide type, polycarbonate type, rubber and the like are mixed. Tends to.

In this case, the specific gravity of the Y separated liquid is 0.9.
It is preferably 2 or more, and particularly preferably 0.95 or more. The specific gravity of the Y separated liquid is 1.01.
It is preferably below, and particularly preferably below 1.00. When the specific gravity of the Y separated liquid is less than 0.92, a part of the polyolefin-based plastic tends to settle and the recovery rate tends to decrease. When the specific gravity of the Y separated liquid exceeds 1.01, the polystyrene-based plastic is There is a tendency that a part of is mixed.

The composition of the separation liquid is not particularly limited, but a solution prepared by dissolving salts such as NaCl in water to adjust the specific gravity can be preferably used.

In the D mechanism, the specific gravity separation device is
A means for supplying the plastic crushed material, a means for supplying the separated liquid, a mixing and stirring tank filled with the separated liquid, a means for collecting the plastic crushed material floating on the liquid surface of the separated liquid, and the mixing and stirring tank It is preferable to have a means for collecting the crushed plastic material that precipitates on the bottom of the tank.

However, it is not necessary to provide all of these means, and it is sufficient to provide at least a tank in which the crushed plastic material and the separated liquid are charged and mixed and stirred.

Further, the recovery means after separating the crushed plastic material may be a method of manually scooping out the floating material or overflowing it by an overflow method. In addition, a method may be used in which the precipitate is sucked up together with the separated liquid by a suction device, is transferred by a screw type transfer device, or the separated liquid is collected in another tank and then the suspended matter is collected. In addition, the separated liquid that flowed out when the suspended solids and the precipitate were collected was pumped up and supplied again into the mixing and stirring tank.
It may be used repeatedly.

In addition, the waste recycling system of the present invention is a mixing and stirring method in which an organic solvent is mixed for further separating a plastic composition of a different system mixed with the plastic composition separated by the D mechanism. A separation device having a tank may be provided as the E mechanism. Further, the mixing and stirring tank provided in the separating device of mechanism E may use the mixing and stirring layer provided in the specific gravity separator of mechanism D.

The F mechanism is preferably a mechanism equipped with an extrusion molding device. The extruder used here is not particularly limited, and examples thereof include a single-screw extruder, a twin-screw extruder, and a multi-screw extruder.

When the thermoplastic composition is molded into pellets for material recycling, it is extruded and then granulated by any of sheet cutting, strand cutting, hot air cutting, underwater cutting and the like. You may. Among these granulation methods, underwater cutting is particularly preferable because it can smoothly supply the resin raw material and can handle a large amount of processing when it is later formed into a specific shape by injection molding.

<Raw Material for Plastic Composition> The above-described method for recycling waste according to the present invention can also be used as a method for producing a raw material for a plastic composition according to the present invention.

The plastic composition raw material of the present invention produced by the above-mentioned method for producing a plastic composition raw material of the present invention is preferably in the form of pellets. At this time, the particle size of the pellets is preferably 1 mm or more, and more preferably 2 mm or more.
The particle size of the pellets is preferably 8 mm or less, and more preferably 5 mm or less.

When the particle size of the pellets is less than 1 mm, the pellets tend to float and the workability tends to deteriorate.
If the particle size of the pellets exceeds 8 mm, the pellets will not be sufficiently melted in the cylinder of the molding machine and will not be uniformly kneaded.

The shape of the raw material of the plastic composition of the present invention is not particularly limited to the pellet shape, and may be any shape such as a sheet shape, a film shape, a pipe shape and the like. It may be determined as appropriate according to the type, the mode of use, required characteristics, and the like.

Further, the plastic composition raw material of the present invention may contain additives such as a heat stabilizer, a light stabilizer, an antistatic agent, a lubricant, a filler, a copper damage inhibitor, an antibacterial agent, and a colorant, if necessary. You may add in the quantity of the range which does not impair the effect of this invention.

<Member Made of Plastic Composition> The above-described method for recycling waste according to the present invention can also be used as a method for producing a member made of the plastic composition of the present invention.

The member made of the plastic composition of the present invention manufactured by the method for manufacturing a member made of the plastic composition of the present invention is an air conditioner, a television,
It is preferably used for products selected from the group consisting of refrigerators and washing machines.

A member made of the plastic composition of the present invention can be molded from the above-mentioned raw material of the plastic composition of the present invention by a method such as injection molding. The injection molding machine used at this time is not particularly limited, but examples thereof include a screw in-line injection molding machine and a plunger injection molding machine.

Further, in order to further simplify the step of molding a member made of the plastic composition of the present invention, a crushed plastic composition is injected without preparing a plastic composition raw material having a shape such as pellets. It is also possible to directly put a member made of a plastic composition into the molding machine as it is.

Further, the member made of the plastic composition of the present invention includes a heat stabilizer, a light stabilizer, an antistatic agent, a lubricant,
If necessary, additives such as a filler, a copper damage inhibitor, an antibacterial agent, and a coloring agent may be added in an amount within the range that does not impair the effects of the present invention, and then molded. The step of adding these additives is preferably when the above-mentioned raw material of the plastic composition or the crushed plastic composition is charged into an extruder or an injection molding machine.

[0149]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto.

<Preparation of Experimental Materials> First, experimental materials used in the following examples were prepared. Specifically, in the step A, a refrigerator, a washing machine, an air conditioner, and a TV, in which the specific gravity of the plastic composition is unified within a certain range for each system, are manufactured, and the product is used as waste, and the step B is used. From the crushed material obtained by crushing with a normal crusher, in step C, a metal-based crushed material is sorted with a sorter using a normal magnetic force, and further, a low-grade with a sorter using a normal wind force. The remaining plastic-based crushed materials were selected as the experimental material (I) by selecting the bulk specific gravity crushed materials.

Similarly, experimental materials used in the following comparative examples were prepared. Specifically, as step A, a crushed product obtained by crushing a waste product obtained by collecting a commercially available refrigerator, a washing machine, an air conditioner, and a TV product using an ordinary crusher as a step B. As a result, in step C, the metal-based crushed material was selected by a normal magnetic separator, and the low bulk density crushed material was further selected by a normal wind-powered mechanical separator. Material (II)
Was prepared as.

<Measurement Method> The physical properties used in the following examples were measured by the following methods.

(I) Tensile strength and tensile modulus It was measured according to JIS K7113.

(Ii) Flexural strength and flexural modulus It was measured according to JIS K7203.

(Iii) Izod impact strength It was measured according to JIS K7110.

<Example 1> According to the procedure shown in FIG. 1, a polyolefin-based plastic composition and a polystyrene-based plastic composition contained in the experimental material (I) were used by using a separated liquid having a specific gravity of 1.08 and a specific gravity of 1.00. Separated using the difference in specific gravity.

As a method for separating the specific gravity, the experimental material (I) was put into a mixing and stirring tank filled with an aqueous sodium chloride solution having a specific gravity of 1.08, stirred, and then floated (polyolefin-based and polystyrene-based plastic composition). Was collected by the overflow method, and the precipitated substances (plastic compositions of other systems, rubber, metals, etc.) were suction-collected together with the aqueous sodium chloride solution.

Here, the aqueous sodium chloride solution flowing out by the overflow method and the aqueous sodium chloride solution simultaneously recovered at the time of suction recovery were injected into the mixing and stirring tank using a pump for reuse.

Next, the polyolefin-based and polystyrene-based plastic compositions recovered as floating materials were put into a mixing and stirring tank filled with water having a specific gravity of 1.00, stirred, and then floated (polyolefin resin). System plastic composition) and the precipitated product (polystyrene system plastic composition) were recovered.

Table 5 shows the composition ratio of the plastic crushed product obtained in Example 1 by system of the plastic composition.

[0161]

[Table 5]

From Table 5, the plastic compositions contained in the plastic crushed material collected from the wastes of the four items of home electric appliances and separated by the above method are the polyolefin plastic composition and the polystyrene plastic composition. I understand.

Then, according to the procedure shown in FIG. 2, the polyolefin-based plastic composition and the polystyrene-based plastic composition obtained above were each finely crushed, washed, and further uniformly mixed.

Then, each of these plastic compositions was melt-kneaded at 230 ° C. using a screw type 45 mm biaxial melt-kneading extruder to prepare pellet-shaped plastic composition raw materials.

Subsequently, each of these plastic composition raw materials was put into a hopper of a 10-ton injection molding machine, and was subjected to AS under injection molding conditions of a molding temperature of 230 ° C. and a mold temperature of 40 ° C.
TM-compliant test pieces for measuring physical properties were prepared, and the physical properties were measured.

At the same time, test pieces for measuring physical properties were prepared for virgin materials of the same series of plastic compositions, and the respective physical properties were measured. Table 6 shows the results of these measurements.

[0167]

[Table 6]

Among the abbreviations listed in Table 6, "R
-O "is a polyolefin plastic composition," R-
"S" is a polystyrene plastic composition, "VO"
Is a polyolefin-based plastic composition (including polypropylene-polyethylene block copolymer), "V-
"S" indicates a polystyrene plastic composition (including high-impact polystyrene).

Here, as understood from Table 6, the tensile strength, elongation, bending strength, and bending of the test pieces for measuring physical properties molded from the polyolefin-based plastic composition and the polystyrene-based plastic composition separated in this example. The measured values of physical properties such as elastic modulus and Izod impact strength were almost the same as those of the virgin material.

Therefore, in the waste recycling method of this embodiment, a medium-grade or low-grade recycled product can be obtained.
It can be said that material recycling of mixed plastic waste, which was previously limited to thermal recycling, has become possible.

Example 2 The following experiment was conducted in Example 2 in order to further improve the quality of the polyolefin-based plastic composition and the polystyrene-based plastic composition obtained in Example 1.

As a result of measuring the content rate (PS / PO) of the polystyrene plastic contained in the polyolefin plastic composition obtained in Example 1, the obtained value was 15%.

The content (PO / PS) of the polyolefin plastic contained in the polystyrene plastic composition obtained in Example 1 was measured. As a result, the obtained value was 2%.

As can be understood from the measurement results, a small amount of polystyrene plastic was mixed in the polyolefin plastic composition separated in Example 1 and a polyolefin plastic was mixed in the polystyrene plastic composition.

The reason why the quality of the recycled product prepared by the method for recycling wastes of Example 1 is lower than that of the virgin material is presumed to contain a small amount of plastic of different composition. It

Therefore, plastics of different compositions mixed in the respective plastic compositions separated in Example 1 are
Example 1 after separation and removal using tetrahydrofuran
Test pieces for measuring physical properties were prepared in the same manner as in, and the physical properties of each test piece were measured. The measurement results are shown in Table 7.

[0177]

[Table 7]

Of the abbreviations listed in Table 7, "R
"-OP" indicates a polyolefin-based plastic from which polystyrene-based plastic has been removed, and "R-SP" indicates a polystyrene-based plastic from which polyolefin-based plastic has been removed.

As can be seen from the results in Table 7, by removing the plastic of different composition from the recycled product prepared by the waste recycling method of Example 1, the physical properties closer to those of the virgin material can be obtained. It has become possible to obtain high-quality recycled products.

<Comparative Example 1> Instead of the experimental material (I),
Test pieces for measuring physical properties were prepared in the same manner as in Example 1 except that the experimental material (II) was used, and the physical properties of each test piece were measured. The results are shown in Table 8.

[0181]

[Table 8]

Here, as understood from Table 8, the tensile strength, elongation, bending strength, and bending of the test pieces for measuring physical properties molded from the polyolefin-based plastic composition and the polystyrene-based plastic composition separated in this example. The measured values of physical properties such as elastic modulus and Izod impact strength were significantly inferior to those of the virgin material.

Next, the compositions of the plastics mixed as these foreign substances were investigated. As a result, as shown in Table 9, the polyolefin-based plastic composition (including polypropylene) containing the inorganic filler and the low-expanded polystyrene-based plastic composition were the main contaminants. Table 9 also shows their specific gravities.

[0184]

[Table 9]

From the results of Examples 1 and 2 described above, the specific gravity of the members made of the polyolefin-based plastic composition used for the four items of home appliances was unified to the range of 0.85-1.00, and the polystyrene-based plastic composition was used. By unifying the specific gravity of the parts made of materials within the range of 1.00 to 1.08, it is possible to recycle high-quality recycled products from the waste of the four items of home appliances, and expand the applications of recycled products. it can.

For example, in the past, since plastics of different compositions were mixed, only low-quality recycled products could be obtained in terms of physical properties and long-term reliability, and they were used only for daily necessities such as hangers and flower pots. According to the waste recycling method of the present invention, a recycled product from the waste of four items of home appliances can be obtained from a recycled plastic product having a high-grade almost single composition. It can be used as a durable consumer product such as a back cover or a divider plate for a refrigerator.

[0187] The method for recycling waste according to the present invention is
The method is not limited to the method for recycling the wastes of the four items of the home electric appliance, and can be suitably used for any product as long as the product is provided with a member made of a plastic composition.

The embodiments and examples disclosed this time must be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

[0189]

INDUSTRIAL APPLICABILITY The method for recycling waste according to the present invention is used for a product to be recycled so that the specific gravity of the members made of the plastic composition of the same system is within a certain range. As long as the product is a product in which the specific gravities of the members made of a plastic composition are substantially uniform in advance, it is possible to obtain a recycled product mainly composed of at least a low-grade or medium-grade thermoplastic plastic composition, and the used product A high percentage of waste can be reused.

The method for recycling waste according to the present invention is
In addition to the method for recycling waste, it also includes a method for re-purifying a plastic composition separated by system of plastic compositions using a plurality of separation liquids having different specific gravities using an organic solvent or the like. By using the method
It is possible to obtain a high-quality recycled product and further expand the applications of the recycled product.

Further, the plastic crushed material, which is a mixture of different plastics separated from the wastes of the products of the four household appliances, has conventionally been sold for a fee, but the wastes of the present invention can be recycled. By separating and recovering by using the chemical method, it is possible to obtain a high-quality plastic composition having a substantially single composition, which enables sale for a fee, and also brings great cost merit.

That is, for the above reasons, the method for recycling waste according to the present invention makes it possible to obtain a plastic composition which is separated from mixed plastic waste for each system and has a low content of impurities. It can be said that it is an efficient and low-cost waste resource recycling method capable of producing a plastic composition raw material or a plastic member from the plastic composition.

Further, the waste recycling system of the present invention separates the mixed plastic waste for each system,
In addition, it is possible to obtain a plastic composition having a low content of impurities, and further, an efficient and low-cost waste resource recycling method capable of producing a plastic composition raw material or a plastic member from the plastic composition is possible. It can be said that this is a waste recycling system.

Further, by the method for producing a plastic composition raw material of the present invention, a plastic composition raw material having a low content of impurities separated for each system is produced from a mixed plastic waste under efficient and low-cost conditions. can do.

[0195] Then, according to the method for producing a member made of the plastic composition of the present invention, from the mixed plastic waste to the plastic composition having a low content of impurities separated for each system, under an efficient and low-cost condition. Can be manufactured.

The plastic composition raw material of the present invention is a plastic composition raw material having a low content of impurities separated for each system, which is produced from a mixed plastic waste under efficient and low-cost conditions. .

Furthermore, the member made of the plastic composition of the present invention can be produced from a plastic composition having a low content of impurities separated by system, which is produced from mixed plastic waste under efficient and low-cost conditions. It is a member.

[Brief description of drawings]

FIG. 1 is a process chart showing a part of an example of a method for recycling waste according to the present invention.

FIG. 2 is a process chart showing a part of an example of a method for recycling waste according to the present invention.

[Explanation of symbols]

101, 102 A process, 103 B process, 104, 1
05 C step, 106, 107 D step, 201, 20
2,203,204,205,206 F process.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B29B 17/00 B29K 23:00 // B29K 23:00 25:00 25:00 B09B 5/00 ZABZ (72 ) Inventor Tetsuya Kadoma 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Prefecture F-term within Sharp Corporation (reference) 4D004 AA22 BA05 BA07 CA04 CA10 CA14 CA45 CB16 4D071 AA43 AB14 AB23 BA15 BB13 CA01 CA05 DA15 4F301 AA12 AA15 AD06 BF03 BF09 BF12 BF29 BF31

Claims (23)

[Claims] 1. A method for recycling waste of a product provided with a member made of a plastic composition, wherein in step A, the specific gravity of the plastic composition of the same system contained in the waste is different from each other. A process of selectively collecting wastes within a certain range different from the plastic composition of the system, a process of crushing the wastes as a process B, and a metal-based crushed product of the crushed wastes as a process C. And a plastic crushed product and a low bulk specific gravity crushed product, a process of separating the plastic crushed product by a plurality of separation liquids having different specific gravities, as a D process, and a F process And a step of molding the plastic composition separated according to the system into a specific shape, the method for recycling waste. 2. In the product selectively recovered in step A, the member made of a plastic composition is a member made of a polyolefin-based plastic composition, a member made of a polystyrene-based plastic composition, and other types of plastic compositions. Which is one or more members selected from the group consisting of the members consisting of, and the specific gravity of the member consisting of the polyolefin-based plastic composition is in the range of 0.85 to 1.00. The specific gravity is in the range of 1.00 to 1.08, and most of the members made of the plastic composition of the other system are in the range of 1.08 to 2.00. The method for recycling waste as described in. 3. In the step D, the specific gravity is 1.01-1.
X separation liquid in the range of 08 and specific gravity of 0.92 to 1.0
The method for recycling waste according to claim 2, wherein the crushed plastics are separated for each system of the plastic composition by using the Y separation liquid in the range of 0. 4. In step D, after separating a member made of a polyolefin-based plastic composition and a member made of a polystyrene-based plastic composition from a member made of a plastic composition of another system by using an X separation liquid, The method for recycling waste according to claim 3, wherein a member made of a polyolefin-based plastic composition and a member made of a polystyrene-based plastic composition are separated by using a Y separation liquid. 5. Between the steps D and F, the step E comprises a step of separating, by using an organic solvent, a different type of plastic composition mixed with the plastic composition separated by type. The method for recycling waste according to any one of claims 1 to 4. 6. The method for recycling waste according to claim 5, wherein in step E, the organic solvent contains tetrahydrofuran. 7. The method according to claim 1, wherein in the step F, the thermoplastic plastic composition among the plastic compositions separated according to the system is melted and then molded into a specific shape. Of recycling wastes in Japan. 8. In the step F, a thermoplastic composition of the plastic compositions separated by system and an unused thermoplastic composition of the same system are mixed and melted, and then formed into a specific shape. The method for recycling waste according to any one of claims 1 to 6, characterized by molding. 9. The method of recycling waste according to claim 7, wherein in step F, the thermoplastic composition is a polyolefin-based plastic composition. 10. The method for recycling waste according to claim 7, wherein in step F, the thermoplastic composition is a polystyrene plastic composition. 11. The specific gravity of a member made of a plastic composition of the same system is within a certain range by recognizing the mark described and / or attached to the discarded product in step A. 11. The method for recycling waste according to any one of claims 1 to 10, wherein waste of a product provided with a member made of the plastic composition is selectively collected. 12. The product provided with a member made of a plastic composition is a product selected from the group consisting of an air conditioner, a television, a refrigerator and a washing machine, and the product according to claim 1. Waste recycling method. 13. A waste recycling system for use in the waste recycling method according to claim 1, wherein the B mechanism is a mechanism for crushing the waste, and a C mechanism.
As a mechanism, a mechanism for separating the crushed waste into metal-based crushed materials, plastic-based crushed materials, and low bulk density crushed materials,
The mechanism D is a mechanism for separating the crushed plastics into a plurality of separation liquids having different specific gravities, and the mechanism F is a mechanism for molding the separated plastic composition into a specific shape. A waste recycling system characterized by including and. 14. The D mechanism has a specific gravity of 1.01 to 1.08.
And a specific gravity separator having a mixing and stirring tank filled with the Y separated liquid having a specific gravity of 0.92 to 1.00. 14. The waste recycling system according to claim 13, which is a mechanism. 15. In the D mechanism, the specific gravity separator is a means for supplying a crushed plastic material, a means for supplying a separation liquid, a mixing and stirring tank filled with the separation liquid, and a floating liquid on the liquid surface of the separation liquid. Means for collecting plastic crushed materials,
15. The waste resource recycling system according to claim 14, further comprising means for collecting the crushed plastic material that precipitates on the bottom of the mixing and stirring tank. 16. An E mechanism is provided with a separator having a mixing and stirring tank filled with an organic solvent for further separating a plastic composition of a different system mixed with the plastic composition separated by the D mechanism by system. The waste recycling system according to any one of claims 13 to 15, further comprising a mechanism. 17. The waste resource recycling system according to claim 13, wherein the F mechanism is a mechanism including an extrusion molding device. 18. A method for producing a raw material for a plastic composition using the method for recycling waste according to any one of claims 1 to 12. 19. A method for producing a member made of a plastic composition, which uses the method for recycling waste according to any one of claims 1 to 12. 20. A plastic composition raw material produced by the method for producing a plastic composition raw material according to claim 18. 21. The plastic composition raw material according to claim 20, which is in the form of pellets. 22. A member made of the plastic composition produced by the method for producing a member made of the plastic composition according to claim 19. 23. The member made of the plastic composition according to claim 22, which is used for a product selected from the group consisting of an air conditioner, a television, a refrigerator and a washing machine.