JP2006272241A - Separation/recovery method of paper component and polyvinylchloride component from polyvinylchloride resin-based wallpaper, and regeneratd polyvinylchloride resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To separate and recover, at high accuracy and high efficiency, wallpaper containing the paper component and PVC coating layer, while keeping respective raw material qualities of substrate backing paper and the PVC coating layer, to improve powder characteristics of the PVC component after recovery, and to recycle polyvinylchloride powers as easily handleable materials in a regenerated raw material market. <P>SOLUTION: This separation/recovery method comprises three processes for: (A) crushing the PVC wallpaper by a crusher 4 with a punching metal or screen 5 with an aperture of 1-25mm installed thereon for regulating crushing size of the wallpaper; (B) separating the crushed wallpaper crushed in the wallpaper crushing process into the paper component and the PVC component by a separator 7; and (C) agitating the PVC component separated in the separation process with a stirrer. The PVC wallpaper has a bulk specific gravity of powder of the PVC component after agitation of 0.2-1.0, from which the regenerated paper component is separated from the regenerated PVC component. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for separating and collecting a paper component and a resin coating layer from a vinyl chloride resin wallpaper used for the interior of a building, and more particularly, separating and collecting a recycled vinyl chloride resin having improved powder characteristics. On how to do.

  Background Art A wallpaper in which a synthetic resin layer such as a vinyl chloride resin (hereinafter referred to as “PVC”) is coated on the surface of a backing paper as a substrate by a coating method or a calendar method is known. However, waste wallpaper that occurs such as renovation and other waste products that occur at the time of replacement, defective products that occur during the manufacturing process, modified products such as designs, and disposal items that are in long-term inventory are typified by paper and PVC backing. It is very difficult to separate the surface layer from the synthetic resin coating layer. For this reason, these waste wallpapers cannot be recycled, and most are processed by landfill processing, incineration processing, and the like. However, landfill processing space is limited, and especially for PVC wallpaper, incineration exhaust gas measures are necessary because chlorine gas is generated at the time of incineration. Concomitantly, the disposal of waste wallpaper has encountered difficulties. In order to solve this problem, various methods for reusing wallpaper and methods for separating the backing substrate paper from the synthetic resin coating layer have been studied and developed.

For example, as a method for reusing wallpaper, a method is disclosed in which PVC wallpaper with backing paper adhered is pulverized or heated and kneaded to be processed into pellets (see, for example, Patent Document 1 and Patent Document 2). . However, these methods have a problem that the processability and mechanical properties of the recycled material are inferior and the usage is limited. As a method of separating and recovering the backing substrate and the PVC coating layer, a method of separating the PVC from the PVC by wetting the backing paper of the wallpaper using water or warm water (for example, see Patent Document 3), or wallpaper using an organic solvent. A method of separating and recovering PVC from a base material backing paper by swelling the PVC layer is disclosed (for example, see Patent Document 4 and Patent Document 5). However, the method of wetting and separating the backing paper and the PVC layer mainly recovers and regenerates the coated PVC layer, and does not take much consideration of the recovery and regeneration of the substrate backing paper. Furthermore, a large-scale treatment device such as a wastewater treatment device, a solvent removal device, and a solvent recovery device is necessary, and the treatment efficiency is poor. Moreover, in these methods, separation of PVC and substrate backing paper is not sufficient, and fibers such as backing paper are mixed in the recovered PVC to obtain recycled PVC having good processability and mechanical properties. I can't. Furthermore, a method is disclosed in which waste wallpaper is introduced into a jet vortex and separated after fine pulverization (see Patent Document 6). However, this method requires high energy for fine pulverization and finely cuts the fibers of the base backing paper, so the recovered base paper component is inferior in quality such as strength as recycled paper and is very useful for use. There is a problem that is narrowly limited. In addition, a method is also disclosed in which waste wallpaper is pulverized by an impact pulverizer and sucked from a suction duct to separate paper, which is light specific gravity, from PVC (see Patent Document 7). According to this method, PVC, which is a heavy specific gravity, remains on the discharge side of the impact pulverizer, while the paper component, which is a light specific gravity, is separated by suction, so that the PVC and the paper component can be easily separated. However, higher separation accuracy and improved recycled material productivity have been desired.
Japanese Patent Laid-Open No. 06-114838 Japanese Patent Laid-Open No. 06-126745 JP-A-52-07979 JP 09-059423 A JP 05-017616 A JP 05-247863 A JP-A-11-197605

  The problem to be solved by the present invention is to solve the problem in separating and recovering a paper component from wallpaper such as waste wallpaper and a synthetic resin coating layer such as PVC, and to provide a wallpaper comprising a paper component and a PVC coating layer. Materials that are easy to handle in the recycled material market by maintaining the quality of each material of the backing paper and the PVC coating layer, efficiently separating and recovering with high accuracy, and improving the powder characteristics of the recovered PVC components It is to recycle as.

In the present invention, a recycled paper component and a recycled vinyl chloride resin component (hereinafter referred to as “PVC component”) are separated and recovered from a vinyl chloride resin-based wallpaper (hereinafter referred to as “PVC wallpaper”). A way to
A) A crushing step of crushing PVC wallpaper by a crusher provided with a punching metal having a mesh opening of 1 mm or more and 25 mm or less or a screen having a mesh opening of 1 mm or more and 25 mm or less, which regulates the size of crushing the wallpaper. ,
B) Separation step of separating the wallpaper pulverized product pulverized in the wallpaper pulverization step into a paper component and a PVC component by a separator;
C) a step of stirring the PVC component separated in the separation step with a stirrer;
The bulk specific gravity of the powder of the PVC component after stirring is 0.2 to 1.0, and is a method for separating and recovering the paper component and the PVC component from the PVC wallpaper. (Claim 1)

  The separation device used in the separation step is provided in a separation tower in which a vacuum suction port is provided in the upper part of the substantially vertical cylindrical body part and a lower part is formed in a funnel shape, and an air supply port is provided in the funnel part. The pulverized wallpaper in which the circular plate is horizontally supported so that there is a ventilation gap between the circular plate and the inner wall of the separation cylinder, and is pulverized in the wallpaper pulverization step by an air transport pipe at the center of the circular plate And the PVC component in the pulverized wallpaper is dropped from the peripheral edge of the circular plate, while the paper component is put into the air flow that enters from the air supply port and rises in the separation tower, and passes through the vacuum suction port. The separation and recovery method according to claim 2, wherein the separation and recovery method is a wind power separation device adapted to perform suction and discharge.

  In the present invention, the ratio (H / D) of the height (H) of the vertical cylindrical body of the separation tower to the diameter (D) in the transverse direction in the wind power separation apparatus is 0.5 ≦ H / D ≦ 3. The separation / recovery method is characterized by being zero (claim 3).

  The present invention is the separation and recovery method, wherein an impact pulverizer is used for pulverizing the PVC wallpaper (claim 4).

  The present invention is the separation and recovery method, wherein the impact pulverizer is a swing hammer crusher type pulverizer.

  The present invention is the separation and recovery method, wherein the pulverization step and the separation step are repeated twice or more, or the separation step is repeated twice or more (Claim 6).

  The present invention is the separation and recovery method, wherein the stirrer is at least one stirrer selected from the group consisting of a Henschel mixer, a super mixer, a ribbon mixer, and a universal mixer. ).

  Furthermore, the present invention is the separation and recovery method, wherein the resin temperature during stirring in the stirring step is within a range of 100 to 200 ° C. (Claim 8).

  The recycled vinyl chloride resin according to the present invention is composed of PVC components separated and recovered from the PVC wallpaper by the method of the present invention as described above.

  According to the present invention, recycled paper and recycled resin can be obtained from PVC wallpaper, and the bulk specific gravity of the recovered PVC component is increased by stirring the PVC component separated and recovered from the paper component. . Thereby, the powder characteristic of the collect | recovered recycled PVC is improved, and workability | operativity at the time of processing into PVC products, such as a PVC flooring and a sound insulation sheet, can be improved.

  As a separation device used in the separation step, a circular plate is provided in a separation tower in which a vacuum suction port is provided at the upper part of a substantially vertical cylindrical body part and a lower part is formed in a funnel shape and an air supply port is provided in the funnel part. , Supporting horizontally so that there is a ventilation gap between the inner wall of the separation cylinder around it, and carrying the wallpaper pulverized material pulverized in the wallpaper pulverization step by an air transport pipe into the center of the circular plate, While the PVC component in the pulverized wallpaper is dropped from the peripheral edge of the circular plate, the paper component is sucked and discharged from the vacuum suction port on the air flow entering the air supply port and rising in the separation tower. By using the wind force separating apparatus, the pulverized wallpaper can be separated into the paper component and the PVC component with high separation accuracy, and recycled paper and recycled PVC with high purity and high quality can be efficiently recovered.

  When the ratio (H / D) of the height (H) of the vertical cylindrical body of the separation tower and the diameter (D) in the transverse direction of the wind separation apparatus is 0.5 ≦ H / D ≦ 3.0 In addition, the paper component and the PVC component in the pulverized wallpaper can be further separated with high separation accuracy.

  By using an impact pulverizer to pulverize the vinyl chloride resin-based wallpaper, the rotary hammer of the impact pulverizer gives an impact force to the wallpaper. It can be made into the opened state and can be peeled off from the PVC component.

  If the impact pulverizer is a swing hammer crusher type pulverizer, the wallpaper can be pulverized by a large impact force or shearing force. As long as it is sufficient, separation and recovery can be performed with high productivity without taking the trouble of cutting into a small size in advance.

  Further, by repeating the pulverization step and the separation step twice or more, or by repeating the separation step two or more times, the paper component and the PVC component are separated with higher accuracy, higher efficiency, higher purity and quality. High recycled paper and recycled vinyl chloride resin can be recovered.

  As the stirrer, by using at least one stirrer selected from the group consisting of a Henschel mixer, a super mixer, a ribbon mixer, and a universal mixer, the bulk specific gravity of the vinyl chloride component separated from the paper component is efficiently increased, The powder characteristics can be improved satisfactorily.

  Moreover, the bulk specific gravity of a vinyl chloride component can be increased more efficiently, and a powder characteristic can be improved by making the resin temperature during stirring in the said stirring process into the range of 100-200 degreeC.

  Hereinafter, a method for separating and recovering a paper component and a PVC component from a PVC wallpaper according to the present invention will be described in more detail based on an embodiment shown in the accompanying drawings. However, these are merely for illustrating and explaining the outline of the method for separating and recovering the paper component and the vinyl chloride component from the wallpaper according to the present invention, and the present invention is not limited thereto. .

  The wallpaper subject to the method of the present invention is, for example, a PVC wallpaper used for the interior of a building, such as renovation, waste products generated at the time of replacement, defective products generated from the manufacturing process, modified products such as designs, and long-term inventory products. The main thing is the waste wallpaper etc. which generate | occur | produces the disposal goods of this, but it is not limited to these. These PVC wallpapers are obtained by coating PVC on the surface of a backing paper whose base material is paper. The base material backing paper is a flame retardant paper (sheet obtained by treating a pulp-based sheet with a flame retardant such as guanidine sulfamate or guanidine phosphate), an inorganic material such as aluminum hydroxide or magnesium hydroxide, and an inorganic material mixed with glass fiber. It may be paper. In addition, the coating layer is made of PVC, and in order to further improve scratch resistance, chemical resistance, contamination resistance, etc., a fluorine resin coating or a PMMA resin film is laminated to improve light resistance. It may be a thing.

  The method of the present invention for separating and recovering the paper component of the backing substrate and the PVC component of the surface layer, which are the materials of the PVC wallpaper as described above, to recycle, the PVC wallpaper is crushed (grinding step), After separating the paper component and the resin component by a separation device such as a fluid, horizontal wind separator, cyclone, dry centrifuge, dry specific gravity separator (separation process), the PVC component separated from the paper component is stirred by a stirrer. (Stirring step) to increase the bulk density and improve the powder characteristics. Further, a commonly used shifter such as a vibration sieve (shifter), a rotary shifter, a reciprocating shifter, etc. is connected to the separation device, and the paper component remaining in the PVC component after separation and recovery is further separated by the separation device. As a result, separation accuracy and throughput can be increased.

  The details of the method of the present invention will be described with reference to FIGS. FIG. 1 shows a wallpaper pulverized product 1 composed of a paper component and a PVC component after the wallpaper is pulverized in the method of the present invention, and a PVC component (non-recycled) separated from the wallpaper pulverized product (reference numeral 1) in the separation step. It is a conceptual diagram of a regular PVC component, code | symbol 2), and a fibrous paper component (code | symbol 3). FIG. 2 is a schematic diagram showing an apparatus configuration for carrying out the paper component and PVC component separation and recovery method from the PVC wallpaper according to the present invention.

  The apparatus shown in FIG. 2 pulverizes wallpaper with a pulverizer 4 and pulverizes the wallpaper, which is a mixture of PVC component 2 that is a pulverized resin coating layer and paper component 3 that is a pulverized substrate backing paper. The pulverizing step for obtaining 1 and the wallpaper pulverized material (mixed material) 1 pulverized by the pulverizer 4 are sent to the separating device 7 by the blower 6 through the air transport pipe 23, and the PVC component 2 which is the pulverized material of the resin coating layer is supplied. The paper component 3 which is received in a PVC receiving tank 8 provided below the separating device 7 and is a pulverized material of the backing material of the base material is provided with a separating step of discharging from the upper part of the separating device 7. Further, as shown in FIG. 2, the separator 7 is connected to a commonly used shifter such as a vibration sieve (shifter), a rotary shifter, a reciprocating shifter, etc. By further separating the paper component 3 remaining in the paper, separation accuracy and throughput can be increased.

  The pulverizer 4 used in the pulverization process is not particularly limited, but in order to achieve the object of the present invention, the PVC component and the paper component, which are the materials of the wallpaper, are separated and recovered and recycled, the pulverizer 4 Selection is important. That is, in the PVC wallpaper, the backing paper and the PVC coating layer are well adhered, and separation is very difficult. In order to accurately separate and collect the paper component of the wallpaper backing paper and the PVC component of the coating layer, the wallpaper is crushed by applying an appropriate impact force to the wallpaper and the paper fiber of the backing paper is unraveled. It is important to peel off the PVC coating layer.

  In the case of a commonly used shear pulverizer, in a shear pulverizer equipped with a sharp blade edge, the substrate backing paper is cut while being in close contact with the PVC coating layer without being unraveled when the wallpaper is pulverized. It will be cut in a state where the covering layer is in close contact with insufficient peeling. For this reason, it becomes difficult to accurately separate the base material backing paper and the PVC coating layer in the subsequent separation step. In addition, the shearing pulverizer having an obtuse edge of the cutter blade gives an impact force to the wallpaper at the time of pulverization, but it is more preferable to use an impact pulverizer such as a swing hammer type as the pulverizer 4 used in the present invention. In the impact pulverizer, the rotating hammer gives impact force to the wallpaper, and the wallpaper is pulverized, and at the same time, the paper fiber of the backing paper is unwound and opened into a soft cotton shape. That is, an appropriate impact force is applied to the wallpaper, and the paper fiber of the base material backing paper is opened into a soft cotton shape and peeled off from the PVC coating layer. The opened soft cotton-like paper component is discharged on an ascending air current in a wind power separating apparatus, which will be described later, and can be separated and collected. On the other hand, the PVC coating layer is pulverized by an impact pulverizer and peeled off from the backing paper, and is recovered as a PVC component 2 by descending in a wind power separator described later.

  In addition, a horizontal wind power sorter, which is a typical sorting device used for sorting foods such as rice, beans, tea, and cereals, is used for the wallpaper pulverized product 1 pulverized using a pulverizer 4 such as an impact pulverizer. In the case of separation, a relatively large size pulverized material is recovered from the discharge port close to the material supply unit of the horizontal wind separator, and a relatively small size pulverized material is recovered from the distant recovery port to the material supply unit. However, in such a horizontal wind power sorter, although roughly separated according to the size of the pulverized material, what is recovered from both outlets is a mixture of PVC component 2 and paper fiber (paper component 3), Classification accuracy is low. That is, a relatively large size pulverized product is classified to the front, and PVC pieces and paper fibers are mixed. On the other hand, a pulverized product having a relatively small size is collected in a state where a small PVC crushed piece is taken into the paper component from a distant collection port, and mixing of the PVC crushed piece is inevitable.

  In the method of the present invention, the pulverizer 4 such as an impact pulverizer for pulverizing the wallpaper has an opening of 1 mm to 25 mm for controlling the size of the pulverized wallpaper, or an opening of 1 mm to 25 mm for the lattice. Install the screen 5. By providing punching metal or screen 5 with an opening of 25 mm or less in the impact pulverizer 4, the size of the pulverized wallpaper is small, the paper fibers of the wallpaper backing paper are sufficiently unraveled, and the peeling from the PVC coating layer is good In the separation step, it is possible to prevent the base material backing paper fibers (paper component 3) from being discharged and collected while adhering to the pulverized PVC coating layer (vinyl chloride component 2). The recovered PVC material is less mixed with paper fibers, is excellent in fluidity, processability and quality characteristics, and uses for which the recovered PVC can be used greatly expand. In addition, by using a pulverizer equipped with a screen having a mesh opening of 1 mm or more, the paper fiber of the base backing paper is not cut smaller than necessary, and recycled paper using the recovered paper component is It has good quality characteristics such as high tensile strength, and uses of recovered recycled paper are expanded.

  In addition, the separation device used in the separation step is not particularly limited, and it is possible to use a general separation device such as a sieve, a horizontal wind separator, a cyclone, a dry centrifugal separator, a dry specific gravity separator, In a separation tower having a vacuum suction port in the upper part of the substantially cylindrical body and a lower part formed in a funnel shape and an air supply port in the funnel part, a circular plate is disposed around the inner wall of the separation cylinder. The wallpaper pulverized product pulverized in the wallpaper pulverizing step is carried into the center of the circular plate by an air transport pipe, and the PVC component in the pulverized wallpaper material is removed. Use a wind power separator that is dropped from the peripheral edge of the circular plate, while the paper component is sucked and discharged from the vacuum suction port on an air flow that enters the air supply port and rises in the separation tower. Is preferred.

  The wallpaper pulverized product 1 obtained by pulverizing the wallpaper with the pulverizer 4 such as the above-described impact pulverizer is separated using a commonly used multistage circular vibration sieve (shifter), a rotary shifter, a reciprocating shifter, etc. In such a case, the opening of the sieve (mesh) is adjusted to be smaller in order, and the PVC coating layer that has passed the sieve is prevented from being mixed with the base paper component, and the PVC component can be recovered. However, the pulverized material mainly composed of the base paper component remains on the sieve, and there is a possibility that a large amount of the pulverized PVC coating layer is taken into the undissolved paper fiber and the PVC component is mixed. In addition, when the shifter is used alone, it is difficult to separate and recover both the paper component 3 of the backing paper and the PVC component 2 of the PVC coating layer from the pulverized wallpaper 1 with high accuracy.

  As a separation device used in the separation step in the method of the present invention, for example, a wind separation device 7 shown in FIG. 4 is preferably used. The wind power separating apparatus 7 shown in FIG. 4 has an upper part 18b of a substantially vertical cylindrical body part 18a formed in a conical cap shape, and is provided with a discharge port 19 for exhausting air by a blower 15 upward from the center part. The lower portion 18c of the body portion 18a is formed in a funnel shape, and is provided with a separation tower 18 provided with an air supply port 20 downward from the center thereof. Further, a substantially circular plate 21 is supported substantially horizontally below the inside of the separation cylinder 18 by a circular plate support 24 so that a ventilation gap 22 exists around the plate 21 around the inner wall of the separation cylinder 18. An air transport pipe 23 is provided in the center of the upper surface of the circular plate 21 for carrying the wallpaper pulverized material 1 pulverized by the pulverizer 4 in the pulverization step by air with the blower 6 and carrying it into the separation tower 18.

  In this wind power separating apparatus 7, the volume of air discharged from the separation tower 18 through the discharge port 19 by the blower 15 is such that the pulverized wallpaper 1 carried into the center of the upper surface of the circular plate 21 from the air transport pipe 23 is separated from the separation tower 18. The pulverized material (PVC component 2) of the PVC coating layer, which flows in the interior 18 and is a relatively heavy component, descends from the ventilation gap 22 provided around the circular plate 21 and is provided in the air supply port provided in the lower part 18c of the separation tower. Eject from 20. On the other hand, the fiber (paper component 3) of the paper component that has been unwound into a cotton base material, which is a relatively light component, is placed on the rising air flow inside the separation tower 18 that is exhausted by the blower 15, and the separation tower upper portion 18b. The exhaust air from the exhaust port 19 is discharged from the air blower 6 through the air transport pipe 23 through the air transport pipe 23 into the separation tower 18 or from the air transport pipe 23 through the air transport pipe 23 into the separation tower 18. Adjust the amount slightly more.

  The separation tower 18 preferably has a ratio (H / D) of the height (H) of the vertical cylindrical body 18a to the diameter (D) in the horizontal direction of 0.5 ≦ H / D ≦ 3. By setting the ratio (H / D) of the height (H) of the separation tower 18 to the diameter (D) in the lateral direction to be 0.5 or more, the flow of the pulverized wallpaper 1 in the separation tower 18 is increased. The component 2 and the paper component 3 are well separated, the paper component is less mixed in the recovered PVC, and the PVC is less mixed in the recovered paper component. Further, the ratio of the height (H) of the separation tower 18 to the diameter (D) in the lateral direction (H / D) is set to 3 or less, so that the paper component pulverized into a fluffy base material which is a light component A large amount of the product 3 is discharged, and the paper component stays in the separation tower to form a lump of paper components gathered in a mat or ball shape. The accuracy of the system is not reduced, and there is no need to install a large blower facility that generates a large volume of blast to discharge the paper component pulverized product 3 from the upper outlet 19 of the separation tower. It is economical.

  Further, the support 24 that horizontally supports the circular plate 21 supports the circular plate 21 so as to be vertically movable by a screw shaft 24a or the like, and ventilates between the outer peripheral edge of the circular plate 21 and the inner wall surface of the separation tower 18. It is preferable that the width of the gap 22 can be adjusted.

  The PVC component 2 separated from the paper component 3 by the wind power separating device 7 is accommodated in the PVC receiving tank 8 installed below the air supply port 18 provided in the separation tower lower portion 18c. On the other hand, the paper component discharged from the discharge port 19 by the blower 15 is collected from the air transport pipe 25 connected to the blower 15 through the cyclone classifier 16 into the paper component collection receiving tank 17.

  In addition, the PVC component 2 accommodated in the PVC receiving tank 8 is further connected to the wind power separating device 7 by connecting a commonly used shifter such as a vibration screen (shifter), a rotary shifter, a reciprocating shifter, etc. Separation accuracy and throughput can be increased. For example, in the apparatus shown in FIG. 2, the PVC component receiving tank 8 is sent to the vibration shifter 11 by the blower 9 through the air transport pipe 26 and the cyclone classifier 10, and the remaining paper component 3 is further separated by the sieve (wire net) 12. Then, it is recovered in a PVC component recovery receiving tank 13 installed below the vibration shifter 11. On the other hand, the mixture of the PVC component and the paper component remaining on the sieve 11 of the vibration filter 11 is collected in the mixture receiving tank 14.

  In the method of the present invention, the wallpaper pulverized product 1 obtained by pulverizing the wallpaper by the pulverization process using the pulverizer 4 such as the impact pulverizer as described above is converted into the PVC component by the separation apparatus such as the wind power separation apparatus 7 in the separation process. 2 and the paper component 3 can be separated and collected with high accuracy. However, as shown in FIG. 3, the wallpaper is removed by a pulverizer 4 such as an impact pulverizer. The pulverized (primary pulverized) wallpaper pulverized product (primary pulverized product) is converted into the paper component 3 of the backing paper and the PVC component 2 of the PVC resin coating layer by the first wind separator 7 (primary separation). The PVC component 2 separated and recovered in the PVC component receiving tank 8 is again put into a second pulverizer 4B such as an impact pulverizer and pulverized (secondary pulverization). 2 wind power separator 7B (secondary separation) It is also possible to further improve the separation accuracy of the PVC component 2 of sheet components 3 and PVC coating layer of the backing paper. In addition, although not shown, the wallpaper pulverized product 1 obtained by pulverizing the wallpaper with a pulverizer 4 such as an impact pulverizer is separated into a paper component 3 and a PVC component 2 by a first separation device (primary separation) such as a wind separator 7. Then, the PVC component 2 collected in the PVC component receiving tank 8 is supplied to the second separation device (secondary separation) composed of the wind power separation device 7 without being pulverized again, and the paper component 3 and the PVC component 2 Separation accuracy can also be improved. In this way, the pulverization step and the separation step are connected in series or in parallel, so that the wallpaper is separated into the paper component 3 of the backing paper and the PVC component 2 of the PVC coating layer with high accuracy and in large quantities. Can be made possible.

  As described above, the PVC component separated and collected from the PVC wallpaper becomes, for example, a lump when placed in a flexible container and left to stand, and is very difficult to take out and difficult to transport and measure. Therefore, the powder of the PVC component 2 separated and recovered from the PVC wallpaper through the pulverization step and the separation step as described above is stirred with a stirrer, and the bulk specific gravity is within the range of 0.2 to 1.0. Adjusting improves powder characteristics and makes handling easier.

  The stirrer for improving the powder characteristics by stirring the PVC component 2 is not particularly limited, but a Henschel mixer, a super mixer, a ribbon mixer or a universal mixer is easily available, and among these, A Henschel mixer, a super mixer or a universal mixer in which the PVC component generates shear heat during stirring is more preferable. When the PVC component 2 is agitated with these Henschel mixer, super mixer or universal mixer to improve the powder properties, the PVC resin component is introduced into the agitator and then the resin temperature inside is 100 to 200 ° C. The bulk specific gravity is preferably in the range of 0.2 to 1.0. At this time, in order to increase the resin temperature quickly, the jacket can be heated with steam or the like. After the heating, it is preferable to cool the resin by adding cold water to the jacket or by intermittently stirring at low speed. In the case of a ribbon mixer, heat generation is less, and it is more preferable to heat the jacket so that the internal resin temperature is 100 to 200 ° C. and the bulk specific gravity is in the range of 0.2 to 1.0. preferable.

  When the bulk specific gravity of the PVC powder after stirring is 0.2, the powder characteristics are good, and when the bulk specific gravity is 1.0 or less, the stirring time does not take and productivity is good. The bulk specific gravity of the PVC powder is more preferably 0.4 or more.

  The recovered PVC component whose powder characteristics have been improved by the method of the present invention as described above can be used for various applications as a recycled raw material for soft PVC products.

(Separation of PVC and paper components from wallpaper)
(Separation 1)
The PVC component and the paper component were separated and recovered from the long-term stock wallpaper (PVC specific gravity 1.5) by the apparatus and process shown in FIGS. The wall paper is crushed by supplying it to an impact crusher (manufactured by Onoe Seisakusho) 4 equipped with a screen 5 having a mesh opening of 5 mm, and the height of the vertical cylindrical body 18a of the separation tower 18 (shown in FIG. 4) of the separation device 7 is increased. The ratio (H / D) of the length (H) to the horizontal diameter (D) is 1.2, and the air volume of the blower 15 is slightly more than the air volume of the blower 6 so that the paper component is discharged from the upper part of the separation tower. The waste wallpaper pulverized product was supplied to the wind power separator 7 adjusted to a higher level. The paper component, which is a light component, was recovered in the paper component recovery tank 17 via the cyclone classifier 16. The PVC component, which is a heavy component, is discharged from the air replenishing port 20 at the lower part 18c of the separation tower and collected in the PVC component receiving tank 8, and the paper component that has been moved in the PVC component is loaded with a sieve 12 having an opening of 5 mm. It separated with the vibration shifter 11, and was collect | recovered in the PVC component collection tank 13. FIG. The paper component removed by the vibration shifter 11 was recovered in the mixture receiving tank 14 as a mixture of the PVC component and the paper component including the PVC crushed pieces taken into the undissolved paper fiber.

  The weight ratio of each recovered component is 71.4% of the PVC component (recovered resin 1) recovered in the PVC component recovery receiving tank 13, 16.1% of the paper component recovered in the paper component recovery receiving tank 17, and the mixture receiving tank The mixture of the PVC component and the paper component recovered in 14 was 12.5%.

  The PVC component (recovered resin 1) recovered in the PVC component recovery receiving tank 13 was dissolved in THF, and then filtered through a 200-mesh wire mesh to recover the paper component contained in the PVC component. 2. The recovered paper component is treated with hydrochloric acid to remove calcium carbonate, which is an additive contained in the wallpaper component, dried, weighed, and the amount of paper component contained in the recovered PVC component is calculated. It was 5% by weight. On the other hand, the amount of PVC resin contained in the paper component recovered in the paper component recovery receiving tank 17 through the cyclone classifier 16 was calculated from the paper component by performing the same analysis as above, and the PVC component was calculated as 1 0.5% by weight.

(Separation 2)
Separation was performed in the same manner as in Separation 1 except that an impact crusher (manufactured by Onoe Seisakusho) equipped with a screen 5 having a mesh opening of 3 mm was used as the grinding machine 4 and the sieve 12 fitted to the vibration shifter 11 had a mesh opening of 3 mm. The PVC component and the paper component were separated and recovered from the same type of wallpaper used in No. 1 by the apparatus and process shown in FIGS.

  The weight ratio of each recovered component is 73.4% for the PVC component (recovered resin 2) recovered in the PVC component recovery receiving tank 13, 18.2% for the paper component recovered in the paper component recovery receiving tank 17, and the mixture receiver. The mixture of the PVC component and the paper component recovered in the tank 14 was 8.4%.

(Separation 3)
Separation is performed in the same manner as in Separation 1 except that an impact crusher (manufactured by Onoe Seisakusho) equipped with a screen 5 with a mesh opening of 10 mm is used as the grinding machine 4 and the sieve 12 mounted on the vibration shifter 11 has a mesh opening of 10 mm. The PVC component and the paper component were separated and recovered from the same type of wallpaper used in No. 1 by the apparatus and process shown in FIGS.

  The weight ratio of each recovered component is 65.0% for the PVC component (recovered resin 3) recovered in the PVC component recovery receiving tank 13, 14.4% for the paper component recovered in the paper component recovery receiving tank 17, and the mixture receiver. The mixture of the PVC component and the paper component recovered in the tank 14 was 20.6%.

(Separation 4)
The PVC component and the paper component were separated and recovered from the same type of wallpaper used for Separation 1 by the apparatus and process shown in FIGS. The wall paper is crushed by supplying it to an impact crusher (manufactured by Onoe Seisakusho) 4 equipped with a screen 5 having an opening of 8 mm, and the height of the vertical cylindrical body 18a of the separation tower 18 (FIG. 4) of the separation device 7 ( H) and the ratio (H / D) of the horizontal diameter (D) are 1.2, and the air volume of the blower 15 is slightly higher than the air volume of the blower 6 so that the paper component is discharged from the upper part 18b of the separation tower. Waste wallpaper pulverized material was supplied to the adjusted wind power separator 7. The paper component was recovered in the paper component recovery receiving tank 17 via the cyclone 16. The PVC component which is a heavy component was received in the PVC component receiving tank 8. The PVC component collected in the PVC receiving tank 8 is charged into an impact pulverizer (manufactured by Onoe Seisakusho) 4B equipped with a screen 5B having a mesh opening of 3 mm, and pulverized again to form a cylindrical body of the separation tower 18 of the separation device 7B. The ratio (H / D) of the height (H) of 18a to the diameter (D) in the lateral direction is 1.2, and the air volume of the blower 15B is higher than the air volume of the blower 6B so that the paper component is discharged from the upper part of the separation tower. Was supplied to a wind separator 7B adjusted to be slightly higher. The paper component was recovered in the recovery receiving tank 17B, and the PVC component was recovered in the PVC component recovery receiving tank 13 via the receiving tank 8B, the blower 9B, the cyclone 10B, and the vibration shifter 11 equipped with a sieve having an opening of 5 mm.

  The total amount of paper components recovered in the paper component recovery receiving tank 17 is 13.7% by weight, the total amount of paper components recovered in the paper component recovery receiving tank 17B is 5.9% by weight, and the PVC components recovered in the PVC recovery receiving tank 13 The recovered amount (recovered resin 4) was 77.2% by weight, and the mixture of the paper component and the PVC component after separation by the vibration shifter 11 recovered in the mixture receiving tank 14 was 3.2% by weight.

  The paper component contained in the recovered PVC resin (recovered resin 4) and the PVC resin content in the recovered paper component were measured in the same manner as in (Recovered resin 1), and the paper component contained in the recovered PVC resin was 1.8. The PVC resin content in the recovered paper component recovered in the paper component recovery receiving tank 17 is 1.8% by weight, and the PVC resin content in the recovered paper component recovered in the paper component recovery receiving tank 17B is 1% by weight or less. there were.

  (Recovered resin 4) was a condition that the amount of wallpaper processed per hour was 50% higher than that of (Recovered resin 1), but the amount of the mixture of PVC component and paper component recovered in the mixture receiving tank 14 was 12. The amount significantly decreased from 5% by weight to 3.2% by weight, and the separation accuracy of both the PVC component and the paper component was improved.

(Separation 5)
The PVC component and the paper component were separated and recovered from the same type of wallpaper used for separation 1 by the apparatus and process shown in FIGS. It is supplied to an impact pulverizer (manufactured by Onoe Seisakusho) 4 equipped with a screen 5 having a mesh opening of 30 mm to pulverize the wallpaper, and the height of the vertical cylindrical body 18a of the separation tower 18 of the separation device 7 (FIG. 4) The ratio (H / D) of (H) to the transverse diameter (D) is 1.2, and the air volume of the blower 15 is slightly higher than the air volume of the blower 6 so that the paper component is discharged from the upper part of the separation tower. The pulverized wallpaper was supplied to the adjusted wind power separator 7 and separated in the same manner as (Separation 1). A sieve 12 having a mesh opening size of 30 mm was mounted as the vibration shifter 11.

  The weight ratio of each recovered component is 43.8% by weight of the PVC component (recovered resin 5) recovered in the PVC component recovery tank 13, 5.2% by weight of the paper component recovered in the paper component recovery receiving tank 17, and the mixture receiver. The mixture of the PVC component and the paper component recovered in the tank 14 was 51.0% by weight.

  In the separation 5, the paper fiber of the substrate backing paper is not sufficiently unraveled and peeled off from the PVC resin, the amount of the recovered paper component is very small, and the amount of the PVC component recovered in the PVC component recovery receiving tank 13 is large. The paper fiber was mixed, and a large amount of the mixture of the PVC component and the paper component in the mixture receiving tank 14 was discharged, resulting in very poor separation accuracy.

(Separation 6)
The PVC component and the paper component were separated and recovered from the same type of wallpaper used for separation 1 by the apparatus and process shown in FIGS. The wallpaper is supplied to an impact pulverizer (manufactured by Onoe Seisakusho) 4 equipped with a strainer 5 having an opening of 5 mm as shown in FIG. 2 to pulverize the waste wallpaper, and the vertical cylindrical body of the separation tower 18 of the separation device 7 (FIG. 4). The blower 6 is used so that the paper component is discharged from the upper part of the separation tower by using a wind power separation device in which the ratio (H / D) of the height (H) of the portion 18a to the diameter (D) in the lateral direction is 4.0. The wallpaper pulverized product was supplied to the wind power separator 7 in which the air volume of the blower 15 was adjusted to be slightly higher than the air volume of The sieve 12 of the vibration shifter 11 was equipped with an opening of 5 mm.

  The weight ratio of each recovered component is 58.4% by weight of the PVC component (recovered resin 6) recovered in the PVC component recovery receiving tank 13, 12.7% by weight of the paper component recovered in the paper component recovery receiving tank 17, and the mixture The mixture of the PVC component and the paper component recovered in the receiving tank 14 was 28.9% by weight.

  In the separation 6, the paper component recovered in the paper component recovery receiving tank 17 was highly accurate, but a large amount of the paper component was discharged together with the PVC component from the air supply port 20 at the bottom of the separation tower. Although the PVC shifter 11 and the paper component were separated and collected by the vibration shifter 11, the recovered paper component in the mixture receiving tank 14 was a paper component with a lot of mat-like lump containing a large amount of PVC component.

  The recovery results of the above separations 1 to 6 are shown in Table 1, and the analysis results of the PVC components and paper components recovered in the separations 1, 4, 5 and 6 are shown in Table 2.

  As is apparent from Tables 1 and 2, according to the method of the present invention, the paper component and the PVC component can be separated and recovered with high accuracy and high productivity from the PVC wallpaper by the pulverization step and the separation step. In particular, the ratio (H / D) of the height (H) of the vertical cylindrical body 18a of the separation tower 18 to the diameter (D) in the transverse direction in the wind power separation apparatus used in the separation step is 0.5 ≦ H. When /D≦3.0, it can be seen that separation is possible with high accuracy.

(Examples 1-7 and Comparative Examples 1-3)
20 kg of the recovered resin is put into a 100 L super mixer, the resin temperature is confirmed, high-speed stirring (800 to 900 rpm) is performed, and sampling is performed when the predetermined resin temperature is reached, and the bulk specific gravity according to JIS K-6721 And the flowability of the powder was measured. The resin temperature during stirring and sampling and the measurement results are shown in Table 3.

注１：樹脂温度が１５０℃に達したのち、低速にして９０℃まで冷却した。
注２：ふわふわで均一に粉状にならなかった。
注３：ＪＩＳ Ｋ−６７２１の漏斗から粉体が流れていく相対速度。
◎：非常に流れやすい。
○：流れる。
×：引っ掛かってうまく流れない。

Note 1: After the resin temperature reached 150 ° C, the resin was cooled to 90 ° C at a low speed.
Note 2: Fluffy and not uniformly powdered.
Note 3: Relative speed at which powder flows from the funnel of JIS K-6721.
A: Very easy to flow.
○: Flowing.
X: It is caught and does not flow well.

  As can be seen from Table 3, according to the method of the present invention, recycled PVC with improved powder characteristics can be obtained from PVC wallpaper.

  By the method of the present invention, the paper component and the PVC component recovered from the wallpaper on which the surface of the substrate backing paper is coated with PVC can be recycled into recycled materials as recycled raw materials.

It is a conceptual diagram which shows the amorphous PVC component (code | symbol 2 in a figure) contained in a wallpaper, a fibrous paper component (code | symbol 3 in a figure), and those wallpaper pulverized materials (code | symbol 1 in a figure) mixed. It is a mimetic diagram showing one embodiment of a separation recovery device used for a separation recovery method of the present invention. It is a schematic diagram which shows other embodiment of the separation-and-recovery apparatus used for the separation and recovery method of the present invention. It is a longitudinal section showing an outline of an embodiment of a wind power separation device used for a separation recovery method of the present invention.

Explanation of symbols

1. 1. Wallpaper crushed material 2. PVC component Paper component 4, 4B. Impact crusher 5, 5B. Screen 6, 6B. Blower 7, 7B. Separation device 8, 8B. PVC component receiving tank 9, 9B. Blower 10, 10B. 10. Cyclone classifier Vibration shifter 12. Fully (wire mesh)
13. PVC component collection receiving tank 14. Mixture receiving tank of paper component and PVC component 15, 15B. Blower 16, 16B. Cyclone classifier 17, 17B. Paper component collection tank 18, 18B. Separation tower 18a. Vertical cylindrical body of separation tower 18b. Upper part of separation tower 18c. Lower part of separation tower 19, 19B. Decompression outlet 20, 20B. Air supply port 21, 21B. Circular plate 22. Gap 23, 23B. Pneumatic transport pipe 24. Circular plate support 24a. Circular plate support screw shaft 25, 25B. Pneumatic transport pipe 26, 26B. Pneumatic transport pipe

Claims (9)

A method of separating and recovering a recycled paper component and a recycled vinyl chloride resin component from a vinyl chloride resin wallpaper,
A) The vinyl chloride resin-based wallpaper is crushed by a pulverizer equipped with a punching metal having a mesh opening of 1 mm or more and 25 mm or less or a screen having a mesh opening of 1 mm or more and 25 mm or less, which regulates the size of the wallpaper. Crushing process;
B) Separation step of separating the wallpaper pulverized product pulverized in the wallpaper pulverization step into a paper component and a vinyl chloride resin component by a separation device;
C) a step of stirring the vinyl chloride resin component separated in the separation step with a stirrer;
The paper component and the vinyl chloride resin component from the vinyl chloride resin-based wallpaper, wherein the bulk specific gravity of the powder of the vinyl chloride resin component after stirring is 0.2 to 1.0 Separation and recovery method.   In the separation apparatus used in the separation step, a circular plate is provided in a separation tower in which a vacuum suction port is provided in the upper part of a substantially vertical cylindrical body part and a lower part is formed in a funnel shape and an air supply port is provided in the funnel part. , Supporting horizontally so that there is a ventilation gap between the inner wall of the separation cylinder around it, and carrying the wallpaper pulverized material pulverized in the wallpaper pulverization step by an air transport pipe into the center of the circular plate, While the vinyl chloride resin component in the wallpaper pulverized product is dropped from the peripheral edge of the circular plate, the paper component is sucked from the vacuum suction port on the air flow entering the air supply port and rising in the separation tower, The separation / recovery method according to claim 1, wherein the separation / recovery method is a wind power separation device that discharges.   The ratio (H / D) of the height (H) of the vertical cylindrical body of the separation tower and the diameter (D) in the transverse direction in the wind power separating apparatus is 0.5 ≦ H / D ≦ 3.0. The separation and recovery method according to claim 2.   4. The separation and recovery method according to claim 1, wherein an impact pulverizer is used for pulverizing the vinyl chloride resin wallpaper.   The separation and recovery method according to claim 4, wherein the impact pulverizer is a swing hammer crusher type pulverizer.   The separation and recovery method according to claim 1, wherein the pulverization step and the separation step are repeated twice or more, or the separation step is repeated twice or more.   The separation and recovery method according to any one of claims 1 to 6, wherein the stirrer is at least one stirrer selected from the group consisting of a Henschel mixer, a super mixer, a ribbon mixer, and a universal mixer. .   The separation and recovery method according to any one of claims 1 to 7, wherein the resin temperature during stirring in the stirring step is within a range of 100 to 200 ° C. A recycled vinyl chloride resin comprising a vinyl chloride resin component separated and recovered from a vinyl chloride resin wallpaper by the separation and recovery method according to claim 1.

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