KR20080079117A - Method for the separation of plastic consisted of pvc, copp and pmma by material - Google Patents

Abstract

A method for separating mixed plastic consisting of PVC(Polyvinyl Chloride), COPP(Polypropylene Copolymer), and PMMA(Polymethyl Methacrylate) is provided to utilize proper charged materials according to the trio series of plastic particles and to apply the optimal air speed, voltage intensity, and relative humidity. A method for separating mixed plastic consisting of PVC, COPP, and PMMA comprises the steps of: charging PVC particles with the negative pole and second mixed particles comprising COPP and PMMA particles, with the positive pole by rubbing or bumping first mixed particles comprising PVC, COPP, and PMMA particles, against charged materials made of one of PVC and PP(Polypropylene); moving the PVC particles to an anode plate and the second mixed particles to a cathode plate by passing the PVC and mixed particles through a gap between the anode and cathode plates; neutralizing the second mixed particles charged with the positive pole; charging COPP particles with the negative pole and the PMMA particles with the positive pole by rubbing or bumping the second mixed particles against the charged materials made of one of PP, LLDPE(Linear Low Density Polyethylene), HDPE(High Density Polyethylene), PET(Polyethylene Terephthalate), rubber, HIPS(High Impact Polystyrene), calibre, GPPS(General Purpose Polystyrene), and PMMA; and separating the COPP particles to the anode plate and the PMMA particles to the cathode plate by passing the COPP and PMMA particles through a gap between the anode and cathode plates.

Description

Method for the separation of plastic consisted of PVC, COPP and PMMA by material}

1 is a graph showing the relationship between the air velocity and the quality and recovery rate of the separated PVC particles according to an embodiment of the present invention,

2 is a graph showing the relationship between the voltage intensity and the quality and recovery of the separated PVC particles according to an embodiment of the present invention,

3 is a graph showing the relationship between the upper humidity and the quality and recovery rate of the separated PVC particles according to an embodiment of the present invention,

4 is a graph showing the relationship between the air velocity and the quality and recovery rate of the separated COPP particles according to an embodiment of the present invention,

5 is a graph showing the relationship between the voltage intensity and the quality and recovery of the separated COPP particles according to an embodiment of the present invention,

6 is a graph showing the relationship between the upper humidity and the quality and recovery of the separated COPP particles according to an embodiment of the present invention.

The present invention relates to a method of sequentially separating the PVC particles, COPP particles and PMMA particles according to the charging sequence, more specifically, after the primary separation of the PVC particles and the second mixed particles, the second mixed particles COPP The present invention relates to a material separation method of mixed plastics in which PVC, COPP, and PMMA are mixed to separate particles and PMMA particles.

With the development of the petrochemical industry, Korea produces about 9.5 million tons, 6% of the world's plastic consumption, following the United States, Japan, and Germany, resulting in 3.5 million tons of waste plastics annually. In addition, since the development of a multi-functional economical material that can replace plastic is not made, the amount of use is increasing more than 10% every year. Therefore, the current trend is that more than 11 million tons of plastic will be produced within 5 years and more than 5 million tons of waste plastic will be generated. However, at present, the recycling rate of waste plastics is only 20% to 30%, and 70% to 80% is disposed of by landfill or incineration. Therefore, economic losses as well as environmental problems are estimated to be substantial.

To regulate the environmental pollution caused by plastics, the government has regulated the incineration and landfill of waste plastic-containing materials since 2004.In addition to the EPR (Extended Producer Responsibility) and the provisions of the Kyoto Protocol, Economic conditions and environmental regulations abroad are increasing the need for recycling waste plastics.

On the other hand, there are about 30 or more kinds of plastics used as household goods, and among them, plastics mainly used are polyethylene (PE), polypropylene copolymer (COPP), homo polypropylene (HOMO-PP), and polyester (PS). ), Polyethylene terephthalate (PET), polyamide (Nylon), polyvinyl chloride (PVC), ABS (ABS: Acrylonitrile, Butadiene, Styrene), CALIBER and acrylic resin (PMMA: Polymethly Methacrylate). These plastics are used as mixed plastics in two or three kinds, and the types and composition ratios are very diverse, so it is very difficult to separate them by material. Therefore, after using the mixed plastics that are combined into two or three kinds, the situation is required to develop a technology that can be selected by each material.

SUMMARY OF THE INVENTION An object of the present invention is to provide a material separation method of mixed plastics in which PVC, COPP, and PMMA are mixed to separate PVC particles primarily from PVC particles, COPP particles, and PMMA particles, and secondly, to separate COPP particles and PMMA particles. There is this.

In addition, the present invention has another object to provide a material separation method of mixed plastics mixed with PVC, COPP and PMMA using a suitable charged material according to the charging sequence of the plastic particles for each material.

In addition, the present invention has another object to provide a material separation method of mixed plastics mixed with PVC, COPP and PMMA applied with optimized air velocity, voltage strength and relative humidity.

Accordingly, an object of the present invention is to charge or frictionally collide with a charged material made of any one material of PVC and PP to the first mixed particles consisting of PVC particles, COPP particles and PMMA particles, the PVC particles are negatively charged A first step in which the second mixed particles comprising the COPP particles and the PMMA particles are positively charged; A second step in which the PVC particles and the second mixed particles pass between the negative electrode plate and the positive electrode plate, wherein the PVC particles move to the positive electrode plate, and the second mixed particles move to the negative electrode plate and separated; A third step of neutralizing the second mixed particles that are positively charged; The second mixed particles are charged by friction or collision with a charged material made of any one material of PP, LDPE, HDPE, PET, RUBBER, HIPS, CALIBER, GPPS, and PMMA, wherein the COPP particles are negatively charged, A fourth step in which the PMMA particles are positively charged; And a fifth step in which the COPP particles and the PMMA particles pass between the negative electrode plate and the positive electrode plate, wherein the COPP particles move to the positive electrode plate, and the PMMA particles move to the negative electrode plate and are separated. PMMA is achieved by the material separation method of mixed plastics mixed.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in this specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors will appropriately define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

The material separation method of the PVC, COPP and PMMA mixed plastic according to an embodiment of the present invention is a method of using the lower electrode according to the work function value of the PVC particles, COPP particles and PMMA particles, the process will be described in detail Same as

First, in order to impart lower electrode properties to the PVC particles, COPP particles, and PMMA particles that are crushed to a predetermined particle size, the first mixed particles composed of PVC particles, COPP particles, and PMMA particles are charged or rubbed with the charged materials. In this case, the charged material according to an embodiment of the present invention is preferably made of any one material of PP (Polypropylene) of PVC (Polyvinyl Chloride).

The charged material used according to an embodiment of the present invention is determined by the charging sequence according to the material of the plastic established in the present invention, the charging sequence of the plastic according to the material according to the present invention is H-PVC, S-PVC, COPP , HOMO-PP, LDPE, HDPE, PET, RUBBER, HIPS, CALIBER, ABS, GPPS and PMMA. That is, in the H-PVC, S-PVC, COPP, HOMO-PP, LDPE, HDPE, PET, RUBBER, HIPS, CALIBER, ABS, GPPS, and PMMA, the negative polarity tends to increase toward the left, and to the right. This means that there is a tendency to become increasingly positive.

According to one embodiment of the present invention, in order to primarily separate the PVC particles from the first mixed particles, a plastic of a material between PVC and PP may be used in the charging sequence of the plastic by material.

That is, according to one embodiment of the present invention, the first mixed particles made of PVC particles, COPP particles and PMMA particles may be charged by a charged material made of any one material of PVC and PP, wherein the PVC particles ( Negatively charged, and the second mixed particle consisting of COPP particles and PMMA particles is positively charged.

The PVC particles and the second mixed particles (COPP particles + PMMA particles) charged by the charged material pass between the negative electrode plate and the positive electrode plate forming the electric field, and according to one embodiment of the present invention, the negative polarity The PVC particles are moved to the positive electrode plate, and the positively charged second mixed particles are separated by moving to the negative electrode plate, and the separated PVC particles and the second mixed particles are respectively collected in the collector collecting them.

At this time, according to an embodiment of the present invention, the first mixed particles composed of PVC particles and the second mixed particles are preferably flowed by air to friction or collide with the charged material, and pass between the negative electrode plate and the positive electrode plate. The moving speed of the air is preferably 6.0 m / s to 12.5 m / s. The reason is that, as shown in the graph shown in Figure 1, when the air moving speed is less than 6.0m / s, or exceeds 12.5m / s, the quality and recovery rate of the PVC particles are less than 95% and 90%, respectively Because it becomes.

In addition, according to one embodiment of the present invention, when the PVC particles and the second mixed particles pass between the negative electrode plate and the positive electrode plate, the voltage strength applied to the negative electrode plate and the positive electrode plate is preferably 15kv or more. The reason is that, as shown in Figure 2, when the voltage strength is less than 15kv, the quality and recovery of the PVC particles are less than 95% and 90%. On the other hand, according to one embodiment of the present invention, the voltage strength is more preferably set to 20kv to 25kv, because of the separation of the PVC particles and the second mixed particles, even if the voltage strength exceeds 25kv, This is because the grade and the recovery rate are kept almost the same to prevent the power consumption more than necessary.

In addition, according to one embodiment of the present invention, when separating the first mixed particles consisting of the PVC particles and the second mixed particles into each of the PVC particles and the second mixed particles, the relative humidity is preferably 45% or less. This is because, as shown in FIG. 3, when the relative humidity is 45% or less, the quality and recovery rate of the PVC particles become 95% and 90% or more, respectively.

According to one embodiment of the present invention, if a first separation process of separating the first mixed particles consisting of the PVC particles and the second mixed particles into the PVC particles and the second mixed particles, respectively, the second mixed particles are then collected The second mixed particles are collected from the collected collector and the second mixed particles are separated into COPP particles and PMMA particles.

Looking at the secondary separation process in detail, first, a process of charging electrons to the COPP particles and PMMA particles to neutralize the COPP particles and the PMMA particles, which are positively charged second mixed particles, is performed.

In order to give neutralized COPP particles and PMMA particles, the COPP particles and PMMA particles are charged with friction or colliding with the charged materials, wherein the charged materials according to the embodiment of the present invention are PP, HDPE. , PET, RUBBER, HIPS (High Impact Polystyrene), CALIBER, GPPS (General Purpose Polystyrene), and any one of PMMA is preferred.

The charged material used to separate the COPP particles and PMMA particles is determined by the charging sequence according to the material of the plastic established in the present invention. This charging sequence was mentioned in the process of separating the PVC particles and the second mixed particles.

Depending on the charging sequence of plastics, PP, LDPE, HDPE, PET, RUBBER, HIPS, CALIBER, GPPS and PMMA between PP and PMMA can be used as charged materials to charge COPP particles and PMMA particles.

At this time, according to one embodiment of the present invention, when the COPP particles and the PMMA particles are charged by the charged material, the COPP particles are charged to the negative polarity, and the PMMA particles are charged to the positive polarity.

The COPP particles and PMMA particles charged by the charged material pass between the negative electrode plate and the positive electrode plate forming the electric field, in which case, the negatively charged COPP particles move to the positive electrode plate, The positively charged PMMA particles migrate to the negative electrode plate and are separated, and the separated COPP particles and PMMA particles are respectively collected in the collector collecting them.

At this time, according to one embodiment of the present invention, the COPP particles and PMMA particles flow by air to friction or collide with the charged material, it is preferable to pass between the negative electrode plate and the positive electrode plate, the movement speed of air is 8.0m / It is preferable that it is s to 12.0 m / s. The reason is that, as shown in the graph shown in Figure 4, when the air moving speed is less than 8.0m / s, or more than 12.0m / s, the quality and recovery of COPP particles are less than 95% and 85%, respectively Because it becomes.

In addition, according to one embodiment of the present invention, when the COPP particles and PMMA particles pass between the negative electrode plate and the positive electrode plate, the voltage strength applied to the negative electrode plate and the positive electrode plate is preferably 25kv or more. This is because, as shown in FIG. 5, when the voltage intensity is less than 25kv, the quality and recovery rate of the COPP particles do not reach 95% and 85%. On the other hand, according to one embodiment of the present invention, at this time, the voltage strength is more preferably set to 25kv to 30kv, because the separation of COPP particles and PMMA particles, even if the voltage strength exceeds 30kv, This is because the grade and the recovery rate are kept almost the same to prevent the power consumption more than necessary.

In addition, according to one embodiment of the present invention, when separating the second mixed particles consisting of COPP particles and PMMA particles into COPP particles and PMMA particles, respectively, the relative humidity is preferably 35% or less. This is because, as shown in FIG. 6, when the relative humidity is 35% or less, the quality and recovery rate of the COPP particles become 95% and 85% or more, respectively.

The present invention has been shown and described with reference to the preferred embodiments as described above, but is not limited to the above embodiments and those skilled in the art without departing from the spirit of the present invention. Various changes and modifications will be possible.

Therefore, according to the present invention, the material separation method of the mixed plastic mixed with PVC, COPP and PMMA can be effectively separated from the PVC particles, COPP particles and PMMA particles by performing a sequential separation process according to the charging sequence.

In addition, the present invention is excellent in the quality and recovery rate of the separated PVC particles and COPP particles by using a suitable charged material according to the charging sequence of the plastic for each material.

In addition, the present invention has the effect of excellent quality and recovery of the separated PVC particles and COPP particles by applying the optimized air velocity, voltage strength and relative humidity.

Claims (12)

The first mixed particles composed of PVC particles, COPP particles, and PMMA particles are charged by friction or collision with a charged material made of any one material of PVC and PP, wherein the PVC particles are negatively charged, and the COPP particles and the The second mixed particles made of PMMA particles are the first step of being positively charged; A second step in which the PVC particles and the second mixed particles pass between the negative electrode plate and the positive electrode plate, wherein the PVC particles move to the positive electrode plate, and the second mixed particles move to the negative electrode plate and separated; A third step of neutralizing the second mixed particles that are positively charged; The second mixed particles are charged by friction or collision with a charged material made of any one material of PP, LDPE, HDPE, PET, RUBBER, HIPS, CALIBER, GPPS, and PMMA, wherein the COPP particles are negatively charged, A fourth step in which the PMMA particles are positively charged; And A fifth step in which the COPP particles and the PMMA particles pass between the negative electrode plate and the positive electrode plate, wherein the COPP particles move to the positive electrode plate, and the PMMA particles move to the negative electrode plate and are separated. PVC, COPP and PMMA comprising a mixed material of the mixed plastic material. The method of claim 1, The PVC particles, the COPP particles and the PMMA particles flow by air, The material separation method of the mixed plastic friction or colliding with the charged material, the mixed PVC, COPP and PMMA passing between the negative electrode plate and the positive electrode plate. The method of claim 2, In the first step and the second step, The movement speed of the air is 6.0m / s to 12.5m / s PVC, COPP and PMMA mixed material mixing method of the material. The method of claim 3, wherein In the first step and the second step, The voltage applied to the negative electrode plate and the positive electrode plate is 15kv or more PVC, COPP and PMMA mixed material mixing method of the material. The method of claim 4, wherein In the second step and the third step, Relative humidity is 45% or less PVC, COPP and PMMA mixed plastic material mixing method. The method of claim 5, In the fourth step and the fifth step, The movement speed of the air is 8.0m / s to 12.0m / s PVC, COPP and PMMA mixed material mixing method of the material. The method of claim 6, In the fourth step and the fifth step, The voltage applied to the negative electrode plate and the positive electrode plate is 25kv or more, material separation method of mixed plastics mixed with PVC, COPP and PMMA. The method of claim 7, wherein In the fourth step and the fifth step, Relative humidity is 35% or less PVC, COPP and PMMA mixed plastic material mixing method. The method of claim 8, In the second step, the quality and recovery rate of the separated PVC particles are 95% and 90% or more, respectively, PVC, COPP and PMMA mixed material mixing method of the material. The method of claim 9, In the fifth step, the quality and recovery rate of the separated COPP particles are 95% and 85% or more, PVC, COPP and PMMA mixed material mixing method. The method of claim 10, In the first step and the second step, The voltage applied to the negative electrode plate and the positive electrode plate is 20v to 25kv PVC, COPP and PMMA mixed material mixing method of the material. The method of claim 11, In the fourth step and the fifth step, The voltage applied to the negative electrode plate and the positive electrode plate is 25kv to 30kv PVC, COPP and PMMA mixed material mixing method of the material.

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