JPH11147973A - Method of treating thermosetting resin powder waste material and method of supplying the waste material to a furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a processing method for turning waste material of thermosetting resin powder into a solid so that it can be reused as a resin material, and to use a thermosetting resin as a fuel or raw material substitute to be blown into a furnace Provision of a method for supplying resin powder waste to a furnace. SOLUTION: When a waste material of thermosetting resin powder is made into a solid so that it can be reused as a resin material, a thermoplastic resin is mixed with the waste material of thermosetting resin powder and heated to obtain a thermoplastic resin. After kneading while softening and melting the resin, the kneaded material is turned into a solid. When supplying the waste material of the thermosetting resin powder to the furnace, the thermoplastic resin is mixed with the waste material of the thermosetting resin powder, and the mixture is heated and kneaded while softening and melting the thermoplastic resin. The kneaded material is granulated, and the granulated material is pneumatically transported and blown into a furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for recycling synthetic resin waste, and a method for solidifying waste thermosetting resin (thermosetting resin powder) generated in powder form. And a method of supplying a waste material of the thermosetting resin powder to a furnace such as a blast furnace as a substitute for a fuel or a raw material.

[0002]

2. Description of the Related Art Synthetic resins are easy to mold and have the property of being chemically stable, so that their products are manufactured in large quantities. When these products become waste, most of them are disposed of in landfills without being reused. However, it becomes difficult to secure landfill sites year by year, and the synthetic resin remains as it is without being decomposed by microorganisms. Therefore, various problems related to landfill disposal have occurred. For this reason, there is a strong need for the development of technology for reusing synthetic resin waste as a resource.

In such a situation, as one of the methods for recycling synthetic resin waste material, the waste material is granulated,
A method of reusing the granular material as a substitute for a carbon material into a blast furnace or the like has been studied.
No. 37926 discloses this.

[0004] Among the synthetic resins, thermosetting resins are used for applications requiring heat resistance and chemical resistance based on their properties, and various forms of waste materials are discharged. However, one of the waste materials is a powdery material.

[0005] However, this powder cannot be melted and molded as in the case of waste thermoplastic resin, so it is difficult to recycle it as a resin material. Further, since this powder is a very fine powder, it is difficult to handle, and this is one of the reasons that the reuse application is not developed.

Further, among waste materials of thermosetting resin, those other than powder can be reused by blowing them into a blast furnace as described above if they are crushed and granulated. Since it is a fine powder, if it is blown into a furnace such as a blast furnace or a scrap melting furnace as it is, operational problems will occur.

That is, according to the research results of the present inventors, when blowing synthetic resin waste into a blast furnace or the like, if the synthetic resin powder is too fine, shelves are suspended in the storage tank and the synthetic resin powder is generated. The body does not fall and cannot be cut out from the storage tank, or powder adheres and clogs the valve or curved pipe part of the airflow pipe installed between the storage tank and the blowing part of the blast furnace etc. Or occur. Therefore, the blowing of the synthetic resin powder is often interrupted, and the supply of the blowing material is not performed smoothly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of waste thermosetting resin powder, and solidifies waste thermosetting resin powder so that it can be reused as a resin material. It is an object of the present invention to provide a method of supplying a thermosetting resin powder to a furnace as a substitute for fuel or a raw material to be blown into the furnace, while providing a processing method for causing the furnace to blow.

[0009]

Means for Solving the Problems In order to achieve the above object, in the method for treating a thermosetting resin according to the first invention, a thermoplastic resin is mixed with waste material of the thermosetting resin powder, After kneading while heating to soften and melt the thermoplastic resin, the kneaded material is turned into a solid.

In the method of supplying waste thermosetting resin powder to a furnace according to the second invention, the thermoplastic resin is mixed with the waste thermosetting resin powder and heated to soften the thermoplastic resin. After kneading while melting, the kneaded material is granulated, and the granulated material is pneumatically transported and blown into a furnace.

As described above, the waste material of the thermosetting resin powder cannot be recycled as a resin material, and since it is a fine powder, it is prevented from being reused for other uses. The present inventor has dealt with this problem and has studied the solidification of thermosetting resin powder by solidifying the powder. However, since the waste material of the thermosetting resin does not melt even when heated, it cannot be recycled by performing the same treatment as the waste material of the thermoplastic resin.

Therefore, in the present invention, a thermoplastic resin is mixed with a thermosetting resin powder and heated to soften and melt the thermoplastic resin, and the thermoplastic resin in a molten state or a semi-molten state is mixed with the thermoplastic resin. After a process of kneading the curable resin powder, the mixture is cooled and solidified to obtain a solid. At this time, the powder of the thermosetting resin does not melt, but the melted thermoplastic resin acts as a binder, so that the powder hardens.

[0013] If the treatment is carried out with the mixing ratio of the thermoplastic resin being more than a certain limit, it becomes possible to melt and mold again. For this reason, if the resin product does not require relatively high strength, a processed product obtained by mixing the above powder with a thermoplastic resin can be used as a raw material for molding.

Further, as described above, when waste material of thermosetting resin powder is used as a blowing material for fuel or raw material,
Although a trouble occurs at the time of blowing, according to the test results of the present inventors, it is confirmed that no trouble occurs if the blowing material is a granular material having a bulk density of a certain level or more. Therefore, in the present invention, first, a thermoplastic resin is mixed with the waste material of the thermosetting resin powder, and after heating and kneading as described above, the kneaded material is granulated, and the granular material is pneumatically transported. Into the furnace. When granulating the kneaded material, the kneaded material may be cooled and solidified and then crushed to be granulated, or the kneaded material may be cut and cooled and solidified to be granulated.

The thermosetting resin powder to which the present invention can be applied includes powders of unsaturated polyester resin, epoxy resin, urethane resin, phenol resin, urea melamine resin, alkyd melamine resin, acrylic melamine resin, etc. Powder consisting of a mixture of those resins, or
A powder obtained by mixing a filler material such as glass with the above resin may be used.

As the thermoplastic resin, polyethylene, polypropylene, polybutene, polystyrene, polyester, or a copolymer thereof can be used.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing an example of a method for processing waste materials of thermosetting resin powder into solids according to the present invention. In the mixing step, a thermoplastic resin crushed or cut to a predetermined size or less is mixed with a waste material of the thermosetting resin powder at a predetermined ratio. In the heating / kneading step, the mixture is heated to melt the thermoplastic resin, and the thermosetting resin powder is kneaded with the thermoplastic resin melt. In the cooling process,
The kneaded material is cooled and solidified by an operation such as water spraying or water injection. Then, if necessary, a crushing step is provided, and the solid is crushed so as to have a predetermined particle size to obtain a granular material mainly composed of a thermosetting resin.

When the waste material of the thermosetting resin powder is made into a granular material as described above, the thermoplastic resin to be mixed is 5 watts.
t% (thermosetting resin: thermoplastic resin = 95: 5) or more. When the content of the thermoplastic resin is less than 5%, a melt serving as a binder during heating and kneading is insufficient,
A brittle solid is produced which collapses during later handling to produce a powder. When the treated material is to be reused as a resin material, the mixing ratio of the thermoplastic resin is set to 30 wt% (thermosetting resin: thermoplastic resin = 70: 30) in order to improve moldability. It needs to be more than degree.

The temperature at the time of heating and kneading is higher than the softening point, preferably the melting point, of the thermoplastic resin. However, if the temperature is raised more than necessary, the decomposition of the resin occurs. Therefore, the upper limit of the heating temperature should be about 350 ° C. Therefore, the heating and kneading process differs depending on the type of resin, but usually,
160 ° C to 350 ° C, preferably 180 ° C to 300 ° C
Perform in a temperature range of about

When heating and kneading the waste material of the thermosetting resin powder and the thermoplastic resin, wood powder, glass powder, or a substance having a melting point similar to that of the thermoplastic resin may be mixed.

FIG. 2 is a diagram showing an example of a processing method when an extruder is used in the heating / kneading step in FIG. In the method using this extruder, first, a thermoplastic resin material is crushed by a crusher 11 to a size of about 5 mm or less. Next, the crushed thermoplastic resin and thermosetting resin powder are each weighed by a predetermined amount, and the two treatment materials are simultaneously charged into the hopper of the extruder 12. The two treated materials enter the cylinder from the hopper of the extruder 12 and
In the supply section, the mixture is stirred well by a screw and sent to the heating / melting section. In the heating / melting section, the thermoplastic resin is melted, and the melt and the thermosetting resin powder are kneaded. The kneaded processing material is extruded from a die attached to the end of the cylinder, formed into a linear body, and discharged.

The molded product is cooled by a cooling device 13 provided with a cooling means such as water spray and becomes a solid. The solid is crushed by the crusher 14 so as to have a predetermined particle size. The granules are sieved as required and sent to the storage hopper 20.

When an extruder is used, in addition to the advantage that the kneading in the heating / kneading step is sufficiently performed, the kneaded material can be formed into a shape such as a linear body. The crushing of objects becomes easier. In addition, since the kneaded material can be formed into an appropriate diameter, a granular material having a desired particle size can be obtained efficiently.

The extruder used in the present invention is used for extruding or melt-spinning a synthetic resin, and may have a single screw or a twin screw. In addition, the feed method of the processing material may be a normal method of loading from above, but depending on the properties of the processing material, a feed method of forcibly loading while compressing is used to improve the processing capacity. Better.

FIG. 3 is a diagram showing an example of a method of supplying a waste material of thermosetting resin powder to a blast furnace as a substitute for a carbon material. A predetermined amount of each of the waste material of the thermosetting resin powder and the thermoplastic resin is sent to, for example, a granulating device 10 configured as shown in FIG. 2 to granulate the powder. Then, the particulate matter is sent to the storage hopper 20 to be temporarily stored, then sequentially extracted, introduced into the blowing hopper 21, and transported by a carrier gas in a gas stream to the blast furnace 30. On this occasion,
The resin particles flow through the air supply pipe 22, are introduced into the blow pipe 31 from a blow nozzle inserted into a blow pipe 31 for blowing provided at the tuyere of the blast furnace 30, and are blown into the furnace. The resin particles blown into the furnace decompose to generate carbon monoxide and hydrogen gas, act as a reducing agent for iron ore, and burn to generate heat of combustion, thereby reducing the charge in the blast furnace. Heats and melts and is effectively used as a substitute for carbon materials.

[0026]

EXAMPLES (Granulation test) Six kinds of thermosetting resin powders and thermoplastic resin shown in Table 1 were kneaded using an extruder and formed into a linear body having a thickness of about 12 mm. . Next, after cooling and solidifying, it was crushed into particles. In this granulation process, an apparatus having the same configuration as the apparatus in FIG. 2 was used, and the processing conditions were as shown in Table 1. In the column of extruder in Table 1, the number and diameter of the screws of the extruder used were described. or,
PE, PP and PS in the column of thermoplastic resin indicate polyethylene, polypropylene and polystyrene, respectively. In the evaluation column, ○ indicates good moldability, and if there was no problem in the crushing treatment for granulation, x indicates insufficient kneading and molding could not be performed, and there was a powder as it was. Indicates the case where

According to Table 1, the relationship between the mixing ratio of the thermoplastic resin and the evaluation of the granulation treatment shows that when the mixing ratio of the thermoplastic resin is 5 wt% (No. 1) or more, good results are obtained. Was obtained, but the mixing ratio was 2 wt% (No. 20 and No. 2).
In the case of 1), molding was defective. From this result, when this granular material is molded and granulated for use as a substitute for fuel or raw material, the mixing ratio of the thermoplastic resin is set to 5%.
It must be at least wt%.

As for the treatment temperature, no inconvenience caused by the temperature occurred within the temperature range shown in Table 1.

[0029]

[Table 1]

(Blow furnace injection test) Alkyd resin powder and polyethylene resin were mixed at a ratio of 95: 5, and the mixture was heated, kneaded, molded, and cooled by an apparatus having the same configuration as the apparatus shown in FIG. , And crushing to obtain a granular material of about 6 mm. Next, the particulate matter was temporarily stored in a storage hopper, sent to a blowing hopper, air-transported under the following conditions, and blown from a blowing nozzle into a tuyere of a blast furnace via a blow pipe.

Blowing conditions Carrier gas: air Blowing amount of synthetic resin granules: 60 kg / min Carrier gas flow rate: 1200 Nm ³ / hr The operating conditions of the blast furnace were as follows, and simultaneously from other tuyeres. Pulverized coal was also injected.

Operating conditions of the blast furnace: Tapping rate: 9000 t / d Coke ratio: 447 kg / t-pig Iron Blowing rate: 7260 Nm ³ / min Oxygen enrichment rate: 4 vol% Blasting temperature: 1200 ° C. Resin under the above conditions Although the blowing of the granular material was performed for 8 hours, no troubles such as hanging of the storage hopper or the blowing hopper on the shelf or clogging of the pneumatic pipe system occurred, and the smooth operation could be continued.

[0033]

According to the method for treating waste thermosetting resin powder according to the present invention, the thermoplastic resin mixed with the waste thermosetting resin powder melts to serve as a binder, and serves as a binder. Since the powder of the thermosetting resin is solidified, the waste material of the thermosetting resin powder can be made into a reusable solid.

According to the method of supplying waste thermosetting resin powder to a furnace according to the present invention, a thermoplastic resin is mixed with the waste thermosetting resin powder, and the mixture is heated, kneaded, solidified, and crushed. Since the particles are granulated, and the particles are pneumatically transported and blown, troubles such as clogging of a pneumatic pipe system or the like do not occur and the supply of the blowing material is performed smoothly.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a processing method for converting waste material of thermosetting resin powder into a solid material according to the present invention.

FIG. 2 is a diagram showing an example of a processing method when an extruder is used in the heating / kneading step in FIG.

FIG. 3 is a diagram showing an example of a method of supplying waste material of thermosetting resin powder to a blast furnace as a substitute for carbon material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Granulation apparatus 11 Crusher 12 Extruder 13 Cooling apparatus 14 Crusher 20 Storage hopper 21 Blow hopper 30 Blast furnace 31 Blow pipe

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // B29K 101: 10 101: 12 105: 26 (72) Inventor Yukihiko Asakawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Inside the corporation

Claims (2)

[Claims] 1. A thermosetting method comprising mixing a thermoplastic resin with waste thermosetting resin powder, kneading the mixture while heating to soften and melt the thermoplastic resin, and then converting the kneaded material into a solid material. A method for treating curable resin powder waste. 2. A thermoplastic resin is mixed with waste material of thermosetting resin powder, and the mixture is heated and kneaded while softening and melting the thermoplastic resin. The kneaded material is granulated, and the granulated material is pneumatically transported. And supplying the waste material of the thermosetting resin powder to the furnace.