KR101986590B1 - Method for manufacturing recycled super engineering plastics using waste synthetic resins - Google Patents

Abstract

(A) pulverizing a waste synthetic resin to a size of about 3-5 mm in diameter; (b) putting the pulverized waste synthetic resin into a molding extruder, heating it to 200-400 占 폚, melting it, extruding it, and molding it into a pellet shape; (c) cooling the extruded pellets by spraying at least one selected from air and water; And (d) cutting the cooled pellet.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for manufacturing recycled super engineering plastics,

The present invention relates to a method for producing a regenerated super engineering plastic using waste synthetic resin.

Super engineering plastics are thermoplastic materials that are excellent in mechanical, chemical, and thermal properties (dimensional stability, durability, heat resistance, moisture resistance, and chemical resistance). Engineering plastics include, but are not limited to, acetal, polycarbonate (PC), polyphenyl sulfide, polysulfone, modified polyphenylene oxide, polyimide, polyamide (PA), polybutylene terephthalate (PBT), acrylonitrile- Butadiene-styrene (ABS), liquid crystal polymers (LCP), ethylene vinyl acetate copolymers (EVA), and other plastics used for engineering purposes.

Super engineering plastics are widely used in various fields such as office automation (OA) devices, information and communication devices, electric / electronic devices, household electric devices, automobiles and architectural fields due to the above characteristics, .

In recent years, as the demand for super engineering plastics has increased, prices have been rising, while the amount of waste plastics being disposed of is increasing. Accordingly, methods for manufacturing recycled engineering plastics utilizing waste plastics are being developed.

However, the production of recycled engineering plastics using waste plastics requires a high level of technology, and therefore, the supply of recycled engineering plastics that can meet the needs of this field is not sufficient.

Particularly, although the process of cooling the extruded molded product in the process of manufacturing the recycled super engineering plastic is very important for satisfying the physical properties required for the engineering plastic, there is still a method of manufacturing the recycled engineering plastic, It is not.

Specifically, in the conventional method of manufacturing a recycled super engineering plastic, an engineering plastic molding to be extruded is immersed in a water tank (water tank cooling). However, such a method tends to twist an extruded engineering plastic molding, do.

Korean Patent Publication No. 10-2001-0055657

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned disadvantages of the prior art,

It is an object of the present invention to provide a method for producing a regenerated super engineering plastic which can provide a regenerated super engineering plastic having physical properties equivalent to those of a new product as a method for producing a regenerated engineering plastic using waste synthetic resin.

The present invention, in order to achieve the above object,

(a) pulverizing waste synthetic resin to a size of about 3-5 mm in diameter;

(b) putting the pulverized waste synthetic resin into a molding extruder, heating it to 200-400 占 폚, melting it, extruding it, and molding it into a pellet shape;

(c) cooling the extruded pellets by spraying at least one selected from the group consisting of air, water, and water.

and (d) cutting the cooled pellets.

The cooling of the extruded pellets in the step (c) may be performed by spraying water. Examples of regenerated super engineering plastics produced in this manner include ABS (acrylonitrile-butadiene-styrene), PET (polyethylene terephthalate), PBT (polybutylene terephthalate), and PC (polycarbonate) resins.

The cooling of the extruded pellets in the step (c) may be performed by spraying air and water together. The recycled super engineering plastics produced in this manner include Liquid Crystal Polymer (LCP), PA6 (Polyamide 6), PA46 (Polyamide 46), PA66 (Polyamide 66), PA610 (Polyamide 610), PA11 Amide 11), PA12 (polyamide 12), PA9T (polyamide 9t), PPS (polyphenylene sulfide), PPA (polyphthalamide) or PCT (polycyclohexylenedimethylene terephthalate).

In the step (c), air may be supplied at 20-120 ° C.

In the step (a), at least one selected from the group consisting of an impact modifier, a tensile strength enhancer, a compatibilizing agent, a lubricant, an antioxidant, a G / F (Gras) Additional additives may be added.

After step (d), (f) dust removal step may be further included.

And (g) after the step (f); And (h) packaging and shipping stages.

According to the method for producing a regenerated super engineering plastic of the present invention, since the engineering plastic is manufactured by spraying at least one selected from air and water and cooling the extruded pellets, the engineering plastic is not distorted, Therefore, the problem of the pellet breaking at the cutting step is prevented, and the super engineering plastic of excellent physical properties can be produced.

In addition, the regenerated super engineering plastics produced through the above-described cooling steps are excellent in mechanical, chemical and thermal properties, excellent in dimensional stability, resistant to impact, and stable to heat or moisture, Providing an equivalent degree of physical properties.

1 and 2 are block diagrams illustrating a method of manufacturing a regenerative super engineering plastic according to an embodiment of the present invention.
3 is a photograph of the shape of PA46 (polyamide 46) prepared in Example 1 of the present invention.

Hereinafter, the present invention will be described in more detail.

The present invention, as described in the block diagram of Fig. 1,

(a) pulverizing waste synthetic resin to a size of about 3-5 mm in diameter (S10);

(b) molding the pulverized waste synthetic resin into a pellet by extruding the pulverized waste synthetic resin into a molding extruder, heating it at 200-400 占 폚 and melting it;

(c) cooling the extruded pellet by spraying at least one selected from air and water (S30); And

(d) cutting the cooled pellets (S40).

Before the step (a), waste synthetic resin such as sprue runner or defective product may be collected and separated by grade, and the waste synthetic resin collection and classifying step may be further included.

In the step (a), for example, an impact modifier, a tensile strength enhancer, a compatibilizing agent, a lubricant, an antioxidant, a G / F (Gras), and an M / F (Moldframe), and the like can be further added.

The waste synthetic resin pulverized in the step (a) is transferred to the bin (BIN) of the step-molding extruder (b), and the drying and dehumidifying process may be further performed before the heat-melting step is performed in the extruder .

Further, in the step (b), when the waste synthetic resin is melted, the impurities contained in the melt may be further removed, and the gas or moisture may be removed by dry vacuum and the discharge pressure may be controlled, A step of suppressing the formation of pores that may be formed in the catalyst layer may be further performed.

In the step (b), when the waste synthetic resin is melted, the melt may be stirred while stirring the melt using an agitator.

The cooling of the extruded pellets in the step (c) may be performed by spraying water.

For example, in the case of ABS (Acrylonitrile-Butadiene-Styrene), PET (Polyethylene terephthalate), PBT (Polybutylene terephthalate) and PC (Polycarbonate) resins, cooling the extruded pellets by the water- It may be desirable to prevent warping of the engineering plastic or prevention of breakage in the cutting step.

The cooling of the pellet extruded in the step (c) may be performed by spraying air and water together.

For example, PA6 (polyamide 6), PA46 (polyamide 46), PA66 (polyamide 6.6), PA610 (polyamide 610), PA11 (polyamide) 11), PA12 (polyamide 12), PA9T (polyamide 9t); As described above, cooling the extruded pellets in such a manner that air and water are injected together as described above is a cause of distortion of recycled super engineering plastics It may be preferable to prevent breakage at the cutting step.

The order of jetting air and water is not particularly limited. For example, water spray nozzles and air spray nozzles may be alternately arranged one to three, the water spray nozzles may be positioned together with the water spray nozzles, and the air spray nozzles may be positioned together with the air spray nozzles.

The cooling of the extruded pellets in the step (c) may be performed by spraying air. For example, in the case of an LCP (Liquid Crystal Polymer) resin, cooling the extruded pellets by the method of spraying air as described above may be preferable for the twisting of the regenerated super engineering plastic or the prevention of the breakage at the cutting step.

In the method of manufacturing the regenerative super engineering plastic of the present invention, it is preferable that the air is supplied at 20-120 ° C in the step (c). The temperature of the air can be controlled by the type of the molding and the external temperature.

In the method of manufacturing the regenerative super engineering plastic of the present invention, after step (d), dust removal step (S50) may be further performed as shown in FIG. 2 (f). The dust removal step removes dust, long pellets, and metal by passing the cut regenerated super engineering plastics through a dust and dirt removal device.

In the method for manufacturing a regenerative super engineering plastic of the present invention, the step (f) may include (g) a step of inspecting a toxic substance component (S60); And (h) a packaging and shipping step (S70).

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples.

Example  1: Manufacture of PA46

The collected PA46 rejects were crushed to a size of 4 mm and then transferred to the bin (BIN) of a molding extruder. Drying and dehumidifying processes were carried out before performing a heating and melting process in a molding extruder, and they were stirred and melted while being heated at 300 ° C, and then extruded and molded into a pellet shape. The extruded pellets were cooled while spraying air at 20-120 DEG C and water at 40-80 DEG C while transferring the extruded pellets to a cooler in which alternate air injection nozzles and water injection nozzles were alternately installed. When the temperature of the pellet reached 80 占 폚 or less, the cooling step was completed, and the pellets were cut so as to have a size of 3 mm x 2 mm in width X lengthwise. The cut, regenerated super engineering plastics were passed through a dust and dirt removal device to remove dust, long pellets, and bark. The dust-removed regenerated super engineering plastics were tested for harmful substances and packaged to regenerate the PA 46 regenerated super engineering plastics (see FIG. 3).

Example  2: PPA (Polyphthalamide)  Produce

The collected PPA defective product was pulverized to a size of 4 mm and then transferred to the bin (BIN) of a molding extruder. Drying and dehumidification are carried out in a molding extruder before performing a heating and melting process. The mixture is stirred and melted while being heated at 300 DEG C, and then gas and moisture are removed by dry vacuum in order to remove impurities contained in the melt, The pressure was adjusted by rotation of the main screw, and the pellet shape was formed by controlling extrusion within a range of 120-400 ° C, maintaining the pellet at a vacuum level (600 mm mmhg) or more, . The extruded pellets were cooled while spraying air at 20-120 DEG C and water at 40-80 DEG C while transferring the extruded pellets to a cooler in which alternate air injection nozzles and water injection nozzles were alternately installed. When the temperature of the pellet reached 80 占 폚 or less, the cooling step was completed, and the pellets were cut so as to have a size of 3 mm x 2 mm in width X lengthwise. Dust, long pellets, and metal were removed by passing the cut recycled super engineering plastic through a dust and dirt removal device. The dust-removed regenerated super engineering plastics were tested for harmful substances and packaged to regenerate the PA6 regenerated super engineering plastics.

Test Example  1: Quality evaluation of recycled super engineering plastics

The PA46 and PPA prepared in Examples 1 and 2 were visually observed to evaluate their quality. As a result, it was confirmed that no distortion occurred during the cooling process, and the cut surface was smooth, so that it was confirmed that the cutting problem did not occur during the cutting process.

Claims (9)

A method of manufacturing an engineering plastic,
(a) pulverizing waste synthetic resin to a size of about 3-5 mm in diameter;
(b) putting the pulverized waste synthetic resin into a molding extruder, heating it to 200-400 占 폚, melting it, extruding it, and molding it into a pellet shape;
(c) alternately spraying air and water to cool the extruded pellets; And
(d) cutting the cooled pellet so that the length and width are 3 mm and 2 mm;
(f) removing dust from the cut pellet;
(g) inspecting the harmful substance component of the dust-removed pellet;
(h) packaging and shipping the pellets for which the harmful substance component is inspected,
The step (a)
The pulverized synthetic resin is mixed with at least one additive selected from the group consisting of an impact modifier, a tensile strength enhancer, a compatibilizing agent, a lubricant, an antioxidant, G / F (Gras), and M / F (Moldframe) Respectively,
The step (b)
When the waste synthetic resin is melted, the molten material is stirred using an agitator, the impurities contained in the molten material are removed, the gas or water is removed by dry vacuum, and the discharge pressure is adjusted to form the recycled engineering plastic And is configured to inhibit pore generation,
The step (c)
The extruded pellets are cooled while being sprayed with air at 20-120 DEG C and water at 40-80 DEG C while feeding the extruded pellets to a cooler in which alternate air injection nozzles and water injection nozzles are alternately provided,
PA6 (polyamide 6), PA6 (polyamide 46), PA66 (polyamide 6.6), PA610 (polyamide 610), PA11 (polyamide 11 ), PA12 (polyamide 12), PA9T (polyamide 9t), PPS (polyphenylene sulfide), PPA (polyphthalamide) or PCT (polycyclohexylenedimethylene terephthalate).


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