JPH06285858A - Continuous hydrolytic method of film-coated synthetic resin scrapped material and its apparatus - Google Patents

Abstract

PURPOSE:To provide a continuously hydrolytic apparatus which can shorten hydrolytic time of a ground material of a film-coated synthetic resin scrapped material without deteriorating material strength and can control its re- solidifying. CONSTITUTION:A hydrolytic bath is divided into an upstream side casing 13c1 and a downstream side casing 13c2, and they are connected each other with a flange. A heating means 13m, for example, an electric heater is arranged on an outer periphery of the downstream side casing, which heats steam inside the downstream side casing. Therefore, even when temperature of steam supplied in order to prevent solidifying again of the ground material in the upstream side casing of which a filling rate of the ground material is high, is made comparatively low, hydrolysis is carried out with steam of high temperature in the downstream side casing of which the filling rate is uniformized, and its hydrolytic time is prevented from being lengthened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for hydrolyzing a synthetic resin waste material having a coating film, and more particularly to a hydrolysis apparatus capable of continuously treating a pulverized material.

[0002]

2. Description of the Related Art In recent years, it has been required to recycle synthetic resin waste materials from the viewpoint of environmental protection, but it is usual to melt and remold the waste materials. However, in Japan, it is common to apply a thermosetting paint to the surface of the synthetic resin material in order to maintain the beauty of the product.
Even if the waste material is melted, the paint is not decomposed, and if it is remolded as it is, it is inevitable that the material strength is deteriorated because the coating film is mixed.

For example, when a bumper is made of waste material,
Collision resistance in cold regions is lower than that of new materials. If the coating film is removed, the reduction in material strength can be avoided, but it is difficult to remove the coating film. That is, it is possible to mechanically remove the coating film by shot blasting etc., but if the shape of the parts is complicated, not only it takes time to remove the coating film, but also it cannot be completely removed. Not suitable for processing.

It has also been proposed to strip the coating with organic salts, but the use of organic salts cannot overcome the environmental problems. In order to solve the above problems, the present applicant has proposed a continuous hydrolysis device capable of continuously hydrolyzing a crushed material of a synthetic resin waste material with a coating without deteriorating the material strength (Japanese Patent Application Flat 4-258483).

[0005]

However, if the hydrolysis is carried out in a relatively high temperature atmosphere of, for example, 150 ° C. in a short time in order to shorten the processing time, the pulverized material may re-solidify. Processing in later steps becomes difficult. Particularly, on the supply side rotary feeder side of the hydrolysis tank, re-solidification is likely to occur because the crushed material is filled in the casing.

The present invention has been made in view of the above problems, and shortens the hydrolysis time of the pulverized material of the coated synthetic resin waste material without deteriorating the material strength, and the occurrence of re-coagulation. It is an object of the present invention to provide a continuous hydrolysis device capable of suppressing the above.

[0007]

A method for continuously hydrolyzing a coated synthetic resin waste material according to a first aspect of the present invention is a cylindrical shape having a pulverized material supply port, a pulverized material discharge port, and a steam supply port and a discharge port. Continuous hydrolysis device for coated synthetic resin waste material, which is composed of a hydrolysis tank casing and a screw blade that conveys the crushed material supplied from the crushed material supply port into the hydrolysis tank casing to the crushed material discharge port It is a continuous hydrolysis method for synthetic resin waste materials with a coating, which uses a low-temperature steam that does not cause re-solidification of the synthetic resin near the crushing material supply port, and is downstream from the crushing material supply port. Then, the hydrolysis is performed by the high temperature steam which is higher in temperature than the low temperature steam.

A continuous hydrolysis device for a coated synthetic resin waste material according to a second aspect of the present invention comprises a cylindrical hydrolysis tank casing having a crushed material supply port, a crushed material discharge port, and a steam supply port and a discharge port. A continuous hydrolysis device for a coated synthetic resin waste material, which comprises a screw blade that conveys the crushed material supplied from the crushed material supply port into the hydrolysis tank casing to the crushed material discharge port, It is characterized in that a heating means for heating the pulverized material and steam inside the hydrolysis vessel casing is provided outside the tank casing on the downstream side in the flow direction of the pulverized material.

[0009]

In the continuous hydrolysis method of a synthetic resin waste material with a coating film according to the first aspect of the invention, the hydrolysis is performed by relatively low temperature steam in the vicinity of the pulverized material supply port where the filling rate of the pulverized material is large. As a result, re-solidification of the pulverized material is suppressed, and the hydrolysis time is shortened by performing hydrolysis with high-temperature steam on the downstream side where the filling rate of the pulverized material is uniform.

In the continuous hydrolysis apparatus for waste synthetic resin material with a coating according to the second aspect of the present invention, in order to suppress re-solidification of the pulverized material in the vicinity of the pulverized material supply port where the filling rate of the pulverized material is large. Even when the steam at a relatively low temperature is supplied, it is possible to prevent the steam temperature from being raised by the heating device on the downstream side where the filling rate of the pulverized material is uniform, and the processing time required for hydrolysis to be prolonged.

[0011]

EXAMPLE FIG. 1 is a flow sheet of a continuous recycling apparatus for synthetic resin waste material with a coating film. The coated resin waste material is, for example, a polypropylene (hereinafter referred to as PP) bumper 100, the surface of which is coated with polyester / melamine or acrylic / melamine paint.

If the synthetic resin is a thermoplastic resin, P
It is not limited to P and may be modified polypropylene, polyethylene, ABS resin, AS resin, polyamide resin, polyester resin, polycarbonate resin, polyacetal resin, polyphenylene oxide or modified polyphenylene oxide. The coating material applied may be urethane-based or amino-resin-based coating that is hydrolyzed to have a low molecular weight.

The crushing device 110 is composed of a coarse crusher 111 and a fine crusher 112. The bumper 100 is crushed into a rod of a predetermined length by the coarse crusher 111 while the surface of the bumper 100 is coated. It is crushed by the fine crusher 112 to be a crushed material having a size of about 5 mm square or less. This pulverized material is supplied to the first metering and delivering device 120,
Suction fan 12a, transport pipe 12b, cyclone 12c,
It is composed of a rotary feeder 12d, a stock bin 12e, a feed screw 12f and a fixed amount feed screw 12g.

That is, the pulverized material is sucked by the suction fan 12a and transported to the cyclone 12c in the transport pipe 12b.
The crushed material stored in the cyclone 12c is the cyclone 1
It is transferred to the crushed material stock bin 12e by the rotary feeder 12d installed at the bottom of 2c. The crushed material transferred to the crushed material stock bin 12e is collected in one side by the feed screw 12f installed at the bottom of the crushed material stock bin 12e, and is fed to the hydrolysis device 130 by a fixed amount by the fixed amount feed screw 12g.

The hydrolysis device 130 comprises an upstream seal rotary feeder 131, a hydrolysis tank 132 and a downstream seal rotary feeder 133. The hydrolysis tank 132 is a device for hydrolyzing the pulverized material,
The coating film on the surface of the pulverized material is hydrolyzed by the steam supplied from the outside to lower the molecular weight. After the treatment, the hydrolyzed and low-molecularized coating film is attached to the periphery of the pulverized material.

The pressure in the hydrolysis tank 132 is controlled by a relief valve 13j connected to the steam outlet. The crushed material that has been transferred to the ejection material discharge port 13g is the rotor 13 of the downstream seal rotary feeder 133.
It is conveyed by the basket of d and supplied to the drying device 140.

The drying device 140 comprises a drying furnace 141, a rotary feeder 142, a bag filter 143 and a suction fan 144. The hot air generated by the hot air generating furnace (not shown) in the drying furnace 141 removes the water content contained in the pulverized material by several percent (wt%) to 0.1% or less. The air containing water is sucked by the suction fan 144 and released into the air.

Before being released into the atmosphere, the bag filter 1
The finely divided paint and PP in 43 may be removed.
The pulverized material collected at the bottom of the drying furnace 141 is discharged by the rotary feeder 142 and supplied to the second weighing and feeding device 150. Second weighing-out device 150
The suction fan 15a, the transport pipe 15b, the cyclone 15c, the rotary feeder 15d, the stock bin 15e, and the feed screw 15 are the same as in the first metering and feeding device 120.
The hydrolyzed pulverized material, which is composed of f and a constant-rate feeding screw 15g, is supplied to the melt-kneading device 160.

The melt-kneading device 160 comprises a biaxial kneader 161 and an extrusion die 162. In the twin-screw kneader 161, the pulverized material is melt-kneaded in order to atomize the hydrolyzed coating film into, for example, several tens of micrometers or less and knead it into the resin. The melt-kneaded material is extruded from an extrusion die 162 having a diameter of, for example, 3 mm to be a linear material, which is supplied to the pellet material manufacturing apparatus 170.

The pellet material manufacturing apparatus 170 includes a cooling water tank 1
71 and a cutting machine 172. Extrusion die 1
The linear material extruded from 62 is cooled and hardened in the cooling water tank 171. After that, it is cut by a cutting machine 172 into a predetermined length of 3 mm, for example, to form a cylindrical pellet material. This pellet material is used as a raw material in a bumper manufacturing process (not shown), for example.

FIG. 2 is a hydrolysis device 1 according to the second invention.
FIG. 30 is a cross-sectional view of 30, which includes a supply-side seal rotary feeder 131, a hydrolysis tank 132, and a discharge-side seal rotary feeder 133. The supply-side seal rotary feeder 131 and the discharge-side seal rotary feeder 133 have the same structure and are composed of a cylindrical casing 13a and a rotor 13b having a recess.

In the rotary feeder, the casing 13
The pulverized material supplied from the material supply port provided in the upper part of a is a rotor 13 driven by a motor (not shown).
The material is discharged quantitatively from the material discharge port provided in the lower portion of the casing 13a by the concave portion provided in b. The rotor 13b is assembled so as to be in contact with the casing 13a, and prevents the high-temperature and high-pressure atmosphere in the hydrolysis tank 132 from leaking to the upstream first metering-out device 120 and the downstream drying device 140.

The hydrolysis tank 132 is a device for hydrolyzing the coating film on the surface of the pulverized material, and has a cylindrical casing 1.
A hollow rotating shaft 13d is installed along the axis 3c. A screw blade 13e is installed around the rotary shaft, and when the rotary shaft 13d is rotated by a motor (not shown), the pulverized material supplied from the material supply port 13f is transported to the material discharge port 13g.

Further, a steam outlet is opened around the rotary shaft 13d, and the steam supplied from the steam supply port 13h through the steam flow passage in the hollow rotary shaft 13d is jetted out, and the steam is supplied to the material supply port. While the pulverized material supplied from 13f is transported to the material discharge port 13g, the coating film on the surface of the pulverized material is hydrolyzed to lower the molecular weight. The temperature of the steam supplied from the steam supply port 13n is the temperature at which re-solidification of the pulverized material supplied from the material supply port 13f does not occur (the pulverized material is PP
If so, it is set to 160 ° C.).

The casing 13c of the hydrolysis tank 132 is divided into an upstream casing 13c1 and a downstream casing 13c2, which are joined by a flange. A heating means 13m, which is, for example, an electric heater, is arranged around the downstream side casing 13c2 to heat the steam in the casing 13c. The pressure in the hydrolysis tank 132 can be controlled by a relief valve 13j connected to the steam outlet 13i.

Therefore, in order to prevent the crushed material from re-solidifying in the upstream casing 13c1 having a high material filling rate, the steam supplied from the steam supply port 13h is heated to 110 ° C.
Hydrolysis tank 1 even at relatively low temperatures
Downstream casing 13c in which the filling rate of the material is made uniform by controlling the pressure in 32 to about 1.3 kgf / cm ^2.
In 2, the heating means 13m suppresses the increase in the steam temperature and the decrease in the hydrolysis rate of the coating film.

[0027]

According to the method for continuously regenerating a synthetic resin waste material with a coating film according to the first aspect of the present invention, the supply steam for preventing the pulverized material from re-solidifying in the upstream casing having a high filling rate of the material. Even if the temperature is set to a relatively low temperature of 120 to 130 ° C., it is possible to prevent the temperature of steam from increasing and the hydrolysis rate of the coating film to decrease in the downstream casing in which the filling rate of the material is uniform. It becomes possible.

According to the second embodiment of the apparatus for continuously recycling a coated synthetic resin waste material, the supply steam is 120 in order to prevent the pulverized material from re-solidifying in the upstream casing having a high material filling rate. Even if the temperature is set to a relatively low temperature of up to 130 ° C, it is possible to suppress a decrease in the hydrolysis rate of the coating film due to the heating of the steam by the heating means in the downstream casing in which the filling rate of the material is uniform. It will be possible.

[Brief description of drawings]

FIG. 1 is a flow sheet of a continuous recycling apparatus for coated synthetic resin waste materials.

FIG. 2 is a sectional view of a hydrolysis device according to a second invention.

[Explanation of symbols]

 131 ... Upstream Rotary Feeder 132 ... Hydrolysis Tank 133 ... Downstream Rotary Feeder 13a ... Casing 13b ... Rotary 13c1 ... Upstream Casing 13c2 ... Downstream Casing 13d ... Rotating Shaft 13e ... Screw Blade 13f ... Material Supply Port 13g ... Material Discharge Outlet 13h ... Steam supply port 13i ... Steam discharge port 13j ... Relief valve 13m ... Heating means

Claims (2)

[Claims] 1. A cylindrical hydrolysis tank casing having a crushed material supply port and a crushed material discharge port, and a steam supply port and a discharge port, and crushed material supplied from the crushed material supply port into the hydrolysis tank casing. A continuous hydrolysis method for a synthetic resin waste material with a coating using a continuous hydrolysis device for a synthetic resin waste material with a coating, which comprises a screw blade that conveys the The hydrolysis is performed with low-temperature steam that does not cause re-solidification of the synthetic resin, and is hydrolyzed with high-temperature steam that is higher than the low-temperature steam on the downstream side of the vicinity of the pulverized material supply port. Disassembly method. 2. A cylindrical hydrolysis tank casing having a crushed material supply port and a crushed material discharge port, and a steam supply port and a discharge port, and crushed material supplied from the crushed material supply port into the hydrolysis tank casing. A continuous blade of synthetic resin waste material with a coating, which comprises a screw blade for transporting the pulverized material to the pulverized material discharge port, wherein the hydrolysis is performed on the outer side on the downstream side in the pulverized material flow direction of the hydrolysis tank casing. A continuous hydrolysis device for a coated resin waste material, which is provided with a heating means for heating pulverized material and steam inside a tank casing.