WO2023162963A1 - 発泡粒子の製造方法および製造装置 - Google Patents

発泡粒子の製造方法および製造装置 Download PDF

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Publication number
WO2023162963A1
WO2023162963A1 PCT/JP2023/006183 JP2023006183W WO2023162963A1 WO 2023162963 A1 WO2023162963 A1 WO 2023162963A1 JP 2023006183 W JP2023006183 W JP 2023006183W WO 2023162963 A1 WO2023162963 A1 WO 2023162963A1
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WO
WIPO (PCT)
Prior art keywords
valve body
expanded beads
valve
flush valve
resin particles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/006183
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English (en)
French (fr)
Japanese (ja)
Inventor
勇貴 早瀬
恭亮 村上
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Kaneka Corp
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Kaneka Corp
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Publication date
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Priority to JP2024503163A priority Critical patent/JPWO2023162963A1/ja
Publication of WO2023162963A1 publication Critical patent/WO2023162963A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/16—Making expandable particles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/16—Making expandable particles
    • C08J9/18—Making expandable particles by impregnating polymer particles with the blowing agent

Definitions

  • the present invention relates to a method and apparatus for manufacturing expanded beads.
  • Foamed particles made of a thermoplastic resin are prepared by dispersing the thermoplastic resin particles in water containing a dispersing agent in a pressure vessel, then adding a foaming agent, and maintaining the mixture under high temperature and high pressure for impregnation with the foaming agent, followed by a low pressure atmosphere. It is known to be produced by a downward discharging method (hereinafter referred to as depressurized foaming method). As a method for producing expanded beads by the depressurized foaming method, there is a technique described in Patent Document 1, for example.
  • thermoplastic resin particles, an inorganic dispersant, a dispersing aid, and a foaming agent are charged together with water in a pressure vessel. After the pressure vessel is heated to adjust the temperature of the mixture in the pressure vessel to a predetermined temperature, the pressure in the pressure vessel is adjusted to a predetermined pressure. Thereby, the thermoplastic resin particles in the pressure container are impregnated with the foaming agent.
  • thermoplastic resin particles impregnated with a foaming agent are released into a low-pressure atmosphere by opening a flush valve provided at the bottom of a pressure-resistant container.
  • An object of one aspect of the present invention is to provide a technique for suppressing the generation of foamed particles with fine cells and producing foamed particles with uniform cells in a depressurized foaming method using a flush valve.
  • an apparatus for producing expanded beads includes a pressure container for expanding polyolefin resin particles, a valve body, and a valve body, and A flush valve for releasing polyolefin resin particles into a low-pressure container, a release pipe for releasing foamed particles released from the flush valve, and an adjustment for adjusting the amount of polyolefin resin particles supplied to the flush valve. and a portion, wherein the adjustment portion is provided between the pressure vessel and the flush valve.
  • FIG. 1 is a diagram schematically showing an example of an expanded bead manufacturing apparatus according to Embodiment 1 of the present invention
  • FIG. 2 is an enlarged cross-sectional view showing a preferred configuration example of a flush valve and a control unit provided in the manufacturing apparatus shown in FIG. 1
  • 2 is an enlarged cross-sectional view showing another preferred configuration example of a flush valve and a control unit provided in the manufacturing apparatus shown in FIG. 1
  • FIG. FIG. 4 is a cross-sectional view showing a schematic configuration of a flush valve provided in an expanded bead manufacturing apparatus according to Embodiment 2 of the present invention.
  • the inventor focused on the amount of resin particles discharged to the flash valve as a method for producing foamed particles with uniform cells in the depressurized foaming method using a flash valve, and made earnest studies. As a result, the present inventors have found that if the amount of resin particles discharged to the flush valve is not controlled at all, the cell diameter of the foamed particles will vary, and the amount of resin particles discharged to the flush valve will depend on the cell structure of the foamed particles. found to affect uniformity. In the depressurized foaming method using a flash valve, by adjusting the discharge amount of the resin particles to the flash valve, the generation of foamed particles with fine cells can be suppressed and the foamed particles with uniform cells can be produced. and arrived at an embodiment of the present invention.
  • an expanded bead manufacturing apparatus includes a pressure-resistant container for foaming polyolefin resin particles, a valve body, and a valve body.
  • a flush valve for releasing the polyolefin resin particles in the pressure vessel into a low-pressure vessel; a discharge pipe for releasing the foamed particles released from the flush valve; and polyolefin resin particles supplied to the flush valve. and an adjusting portion for adjusting the amount of the gas, wherein the adjusting portion is provided between the pressure vessel and the flush valve.
  • the adjustment unit adjusts the amount of polyolefin resin particles discharged from the pressure container so that the amount of polyolefin resin particles supplied to the flush valve is constant.
  • the adjustment part can also be said to be an inflow restriction part that restricts the inflow of the polyolefin-based resin particles into the flush valve.
  • the amount of polyolefin-based resin particles supplied to the flush valve is adjusted by the adjusting unit, the resin particles in the pressure container do not flow into the flush valve all at once, and A regulated amount flows into the flush valve. Therefore, according to the above configuration, it is possible to suppress the generation of foamed beads with fine cells and to manufacture foamed beads with uniform cells.
  • FIG. 1 is a diagram schematically showing an example of an expanded bead manufacturing apparatus 10 according to this embodiment.
  • the manufacturing apparatus 10 includes a pressure vessel 1, a flush valve 20, a discharge pipe 3, and a transport pipe 4 for transporting foamed particles.
  • the flush valve 20 side is the lower side
  • the side opposite to the flush valve 20 is the upper side.
  • the pressure-resistant container 1 is a container for producing foamed particles by the depressurized foaming method.
  • a pressure vessel 1 is charged with polyolefin resin particles P0 (hereinafter sometimes referred to as resin particles P0), a foaming agent, and an aqueous dispersion medium S.
  • resin particles P0 polyolefin resin particles
  • S aqueous dispersion medium
  • the pressure container 1 is heated to adjust the temperature of the content inside the pressure container 1 to a temperature equal to or higher than the softening temperature of the resin particles P0
  • the pressure inside the pressure container 1 is adjusted to a predetermined pressure.
  • the resin particles P0 in the pressure container 1 are impregnated with the foaming agent.
  • the flush valve 20 is provided at the bottom of the pressure vessel 1.
  • the flush valve 20 is also called a tank valve. By opening the flush valve 20, the resin particles P0 pass through the flush valve 20 and are discharged into the discharge pipe 3 and the transport pipe 4, which are low-pressure spaces, to become expanded particles P.
  • the discharge pipe 3 is a pipe for discharging the foamed particles P discharged from the flush valve 20 to the transport pipe 4 .
  • the discharge pipe 3 is the pipe that connects between the flush valve 20 and the transport pipe 4 .
  • the discharge tube 3 has the shape of a conical cylinder tapering towards the flush valve 20 .
  • the transport pipe 4 is a pipe for transporting the expanded particles P.
  • the foamed particles P are transported together with the transport air, and are stored in a predetermined storage tank after undergoing at least washing treatment, drainage treatment, dehydration treatment, and drying treatment.
  • various equipment other than the pressure vessel 1, the flush valve 20, the discharge pipe 3, and the transport pipe 4 are capable of performing at least the above-described cleaning treatment, drainage treatment, dehydration treatment, and drying treatment.
  • the control unit provided in the manufacturing apparatus 10 is (a) provided between the pressure vessel 1 and the flush valve 20, and (b) has a structure capable of adjusting the amount of the resin particles P0 discharged from the pressure vessel 1. If there is, it is not particularly limited.
  • the control section may be a structure having slits, meshes, or holes provided at the outlet of the pressure vessel 1 through which the resin particles P0 can pass. The resin particles P0 are restricted from flowing into the flush valve 20 by the slits or network structure.
  • the total area of the slits, meshes, or holes of the adjustment part is preferably 1-15%, more preferably 1-10%, of the area of the outlet portion of the pressure vessel. With this configuration, the pressure in the pressure vessel can be kept more constant. From the viewpoint of sufficiently exhibiting the effect of restricting the inflow of the resin particles P0 into the flush valve 20, the slits, meshes, or holes preferably have an area that allows the resin particles P0 to pass through.
  • FIG. 2 is an enlarged cross-sectional view showing a preferred configuration example of the flush valve 20 and the control unit 5 provided in the manufacturing apparatus 10. As shown in FIG. Note that FIG. 2 shows the configuration of the control unit 5 in a state where the flush valve 20 is opened.
  • the flush valve 20 includes a valve body 21 and a valve body 22.
  • the valve body 21 has an inlet 21a, a guide surface 21b, and a connecting port 21c.
  • the inlet 21 a is formed in the upper portion of the valve body 21 .
  • the guide surface 21b is a surface perpendicular to the axis E of the valve body 22, and is configured to guide the resin particles P0 flowing into the valve body 21 to the connection port 21c.
  • the connecting port 21c is formed at the connecting portion between the valve body 21 and the discharge pipe 3 . The valve body 21 and the discharge pipe 3 are communicated with each other through the connection port 21c.
  • the valve body 22 is a piston that moves vertically within the valve body 21 .
  • the tip portion of the valve body 22 on the side of the inlet 21a has a truncated cone shape that narrows toward the inlet 21a.
  • a gap is provided between the inner surface of the valve body 21 and the valve body 22 in the portion between the connecting portion between the discharge pipe 3 and the valve body 21 and the inlet 21 a of the valve body 21 .
  • the gap serves as a flow path for the resin particles P0 flowing from the inlet 21a.
  • no gap is provided between the inner surface of the valve body 21 and the valve body 22 in the portion below the guide surface 21b. That is, in the valve body 21, the resin particles P0 do not flow below the guide surface 21b.
  • the flush valve 20 has an operating portion (corresponding to the operating portion 23 shown in FIG. 4). By operating the operating portion, the valve body 22 moves vertically.
  • the operation unit may be automatically operable or manually operable.
  • the control unit 5 is provided between the pressure vessel 1 and the flush valve 20.
  • the adjustment section 5 includes a shaft 51 and a tubular section 52 .
  • the shaft 51 is a rod-shaped member that extends upward and is connected to the tip portion of the valve body 22 of the flush valve 20 .
  • the shaft 51 moves vertically in conjunction with the vertical movement of the valve body 22 .
  • the cylindrical portion 52 connects the outlet 1a of the pressure vessel 1 and the inlet 21a of the flush valve 20 (valve body 21).
  • the tubular portion 52 has a communication port 52 a (first communication port) communicating with the pressure vessel 1 and a communication port 52 b (second communication port) communicating with the flush valve 20 .
  • the communication port 52 a has a diameter smaller than that of the outlet 1 a of the pressure vessel 1 .
  • the communication port 52b is located above the inlet 21a of the valve body 21 and has a smaller diameter than the inlet 21a. Therefore, the valve body 22 opens or closes the communication port 52b by moving up and down within the valve body 21 . In the manufacturing apparatus 10, by changing the lowering distance of the valve body 22, the area occupied by the gap between the communication port 52b and the valve body 22 is changed, and the valve opening can be adjusted.
  • the shaft 51 is inserted into the tubular portion 52 .
  • the shaft 51 protrudes from the communication port 52a.
  • the end portion 51 a of the shaft 51 on the side of the pressure vessel 1 is arranged at the second position II inside the pressure vessel 1 .
  • the shaft 51 is configured to move toward the communication port 52a in conjunction with the opening of the flush valve 20. More specifically, when the valve body 22 descends to open the communication port 52b, the end portion 51a of the shaft 51 moves downward and stops at the first position I, which is the position of the communication port 52a. That is, the end portion 51a does not move below the first position I during the foaming process of the resin particles P0 by depressurization foaming (in other words, during the opening operation of the flush valve 20). Further, in the adjustment portion 5, the shaft 51 and the communication port 52a form a gap 6 through which the resin particles P0 pass. During the foaming process, the end 51a of the shaft 51 moves from the second position II to the first position I in conjunction with the opening operation of the flush valve 20 . Further, the end portion 51a of the shaft 51 moves from the first position I to the second position II in conjunction with the closing operation of the flush valve 20 after the foaming process.
  • the valve body 22 is lowered from the valve main body 21 by the operation of the operating portion, and the communication port 52b is opened from the closed state.
  • the resin particles P0 pass through the cylindrical portion 52 of the adjusting portion 5 together with the aqueous dispersion medium S, and flow into the low-pressure valve main body 21 from the communication port 52b.
  • the resin particles P0 are guided to the connection port 21c and discharged to the discharge pipe 3 to become the foamed particles P. As shown in FIG.
  • the end portion 51a of the shaft 51 is positioned at the first position I and does not move below the first position I during the foaming process. Therefore, the gap 6 through which the resin particles P0 pass is maintained during the foaming process. Therefore, during the foaming process, the resin particles P0 in the pressure container 1 pass through the gap 6, pass through the cylindrical portion 52, and flow into the valve body 21 from the communication port 52b. As a result, the amount of resin particles P ⁇ b>0 discharged from the pressure vessel 1 to the flush valve 20 is limited to the amount that has passed through the gap 6 by the control unit 5 .
  • the resin particles P0 in the pressure container 1 do not flow into the flush valve 20 at once, but flow into the flush valve 20 after being adjusted to a constant amount. Therefore, according to the apparatus for manufacturing expanded beads according to the present embodiment, it is possible to suppress generation of expanded beads having fine cells and to manufacture expanded beads having uniform cells.
  • valve body 22 is further lowered when the remaining matter inside the pressure vessel 1 is discharged to the outside.
  • the end portion 51a of the shaft 51 moves below the first position I.
  • the gap 6 is not formed between the shaft 51 and the communication port 52a, and the remaining substances in the pressure vessel 1 flow into the flush valve 20 at once from the communication port 52a.
  • the shaft 51 protrudes from the communication port 52a when the flush valve 20 is closed, and (ii) moves toward the communication port 52a in conjunction with the opening of the flush valve 20. It is not limited to the configuration shown in FIG. 2 as long as it is configured so as to move toward it.
  • the shaft 51 may be constructed so that the gap 6 is maintained during the foaming process.
  • shaft 51 may be configured such that end 51a moves from second position II to a position closer to second position II than to first position I during the foaming process. Even with the configuration of the shaft 51, the gap 6 is maintained during the foaming process.
  • the dimension of the gap 6 can be expressed as the difference between the diameter of the shaft 51 and the diameter of the communication port 52a.
  • the size of the gap 6 is not particularly limited as long as it is a size through which the resin particles P0 in the pressure container 1 can pass. From the viewpoint of sufficiently exhibiting the effect of restricting the inflow of the resin particles P0 into the flush valve 20 through the gap 6, the size of the gap 6 is preferably 1 to 5, more preferably 1 to 3 resin particles.
  • the dimension is such that P0 can pass through.
  • the dimension of the gap 6 is preferably 0.1 mm to 10 mm, more preferably 0.5 mm to 5 mm.
  • the dimension of the tubular portion 52 in the direction of the axis E of the valve body 22 is not particularly limited. However, from the viewpoint of exhibiting the effect of restricting the inflow of the resin particles P0 into the flush valve 20 through the gap 6 and avoiding an increase in the size of the manufacturing apparatus 10, in the direction of the axis E of the valve body 22, the cylindrical portion 52 is preferably smaller than the size of the flush valve 20, more preferably 40% to 90% of the size of the flush valve 20, even more preferably 50% to 70% of the size of the flush valve 20. Specifically, the dimension of the cylindrical portion 52 in the direction of the axis E of the valve body 22 is preferably 10 mm to 40 mm, more preferably 20 mm to 30 mm.
  • the discharge pipe 3 is connected to the valve body 21 of the flush valve 20 so as to be inclined with respect to the direction in which the valve body 22 extends.
  • the axis F of the discharge tube 3 is inclined with respect to the axis E of the valve body 22 . Therefore, when the flush valve 20 is opened, the resin particles P0 flow together with the aqueous dispersion medium S from the communication port 52b. Then, the resin particles P0 are guided to the connecting port 21c by abutting on the guide surface 21b, and discharged into the discharge pipe 3 to become the foamed particles P. As shown in FIG. In this way, the resin particles P0 abut on the guide surface 21b and change their moving direction until they become the expanded beads P. Therefore, it is possible to obtain good expanded beads with less variation in the expansion ratio.
  • the valve body 22 is lowered from the valve main body 21 by the operation of the operation section.
  • the flush valve 20 by changing the lowering distance of the valve body 22, the area occupied by the gap between the communication port 52b and the valve body 22 is changed, and the opening degree of the valve can be adjusted.
  • the manufacturing apparatus 10 also includes a receiving portion 52c.
  • the receiving portion 52c is in close contact with the valve body 22 when the flush valve 20 is closed.
  • the receiving portion 52 c is provided in the adjusting portion 5 and not provided in the flush valve 20 . More specifically, the receiving portion 52c is provided at the lower end portion of the cylindrical portion 52.
  • a communication port 52b is formed in the receiving portion 52c.
  • the lower surface of the receiving portion 52c of the tubular portion 52 functions as a cover surface that covers the inlet 21a of the valve body 21. As shown in FIG.
  • FIG. 3 is an enlarged cross-sectional view showing another preferred configuration example of the flush valve 20A and the control section 5A provided in the manufacturing apparatus 10.
  • FIG. 3 The configuration shown in FIG. 3 is different from the configuration shown in FIG. 2 in that the adjustment portion 5A is not provided with a receiving portion that is in close contact with the valve body 22 when the flush valve 20A is closed.
  • the receiving portion 21d is provided on the valve body 21.
  • the receiving portion 21 d is a protruding portion that protrudes inward from the inner wall of the upper end portion of the valve body 21 .
  • An inlet 21a is formed in the receiving portion 21d.
  • the lower surface of the receiving portion 21 d functions as a cover surface for the upper end portion of the valve body 21 .
  • the communication port 52b is positioned above the inlet 21a of the valve body 21, and has a diameter equal to or larger than the inlet 21a.
  • the valve element 22 opens or closes the inlet 21a by moving up and down within the valve body 21 .
  • the shaft 51 protrudes from the communication port 52a.
  • the shaft 51 is configured to move toward the inlet 21a in conjunction with the opening of the flush valve 20A.
  • the valve body 22 is lowered from the valve main body 21 by the operation of the operating portion, and the inlet 21a is opened from the closed state.
  • the resin particles P0 pass through the cylindrical portion 52 of the adjusting portion 5A together with the aqueous dispersion medium S, and flow into the low-pressure valve main body 21 from the communication port 52b.
  • the resin particles P0 are guided to the connection port 21c and discharged to the discharge pipe 3 to become the foamed particles P. As shown in FIG.
  • the end portion 51a of the shaft 51 is positioned at the first position I and does not move below the first position I during the foaming process. Therefore, the gap 6 through which the resin particles P0 pass is maintained during the foaming process. Therefore, during the foaming process, the resin particles P0 in the pressure container 1 pass through the gap 6, pass through the cylindrical portion 52, and flow into the valve body 21 from the inlet 21a.
  • the raw material of the foamed particles P used in the manufacturing apparatus 10 may be any raw material that can be foamed by the depressurized foaming method described above, and includes at least the polyolefin resin particles, the foaming agent, and the aqueous dispersion medium S.
  • various additives can be added as necessary as raw materials for the foamed particles. Examples include flame retardants, heat stabilizers, radical generators, processing aids, weather stabilizers, nucleating agents, foaming aids, antistatic agents, radiation heat transfer inhibitors, and coloring agents. . These additives can be used individually by 1 type or in combination of 2 or more types.
  • the polyolefin-based resin used in this embodiment is not particularly limited, and examples thereof include polyolefin-based resins exemplified in International Publication WO2020/158061.
  • FIG. 4 is a cross-sectional view showing a schematic configuration of a flush valve 20A provided in the manufacturing apparatus according to this embodiment.
  • this manufacturing apparatus differs from Embodiment 1 in the configuration of the flush valve 20A.
  • the flush valve 20 ⁇ /b>A includes an operation portion 23 and a guide surface 21 e of the valve body 21 is a surface inclined with respect to the axis E of the valve body 22 .
  • the operation unit 23 has the same functions as those of the operation unit described in the first embodiment, so description thereof will be omitted.
  • the guide surface 21e is inclined so that the end 21f on the side of the connection port 21c is the lowest. Therefore, the resin particles P0 come into contact with the guide surface 21e and smoothly reach the connection port 21c. Become. As a result, it is possible to prevent the generation of expanded particles P having finer cells on the surface of the particles and flat expanded particles P.
  • the guide surface 21e is not limited to the configuration in which the end 21f on the side of the connection port 21c is inclined to the lowest side, and any configuration in which the guide surface 21e is inclined to the extent that it can be smoothly guided to the connection port 21c can be used. good.
  • the inclination angle of the guide surface 21e with respect to the plane perpendicular to the axis E is more than 0° and 60° or less. and more preferably 15° or more and 45° or less.
  • a method for producing expanded beads according to an embodiment of the present invention includes a foaming step of obtaining expanded beads by a depressurized foaming method.
  • the expanded particle production apparatus used in the expansion step includes a pressure vessel for expanding the polyolefin resin particles, and a flush valve for discharging the polyolefin resin particles in the pressure vessel to a low pressure vessel. and a discharge pipe for discharging foamed particles discharged from a flush valve, wherein an adjustment unit for adjusting the amount of polyolefin resin particles supplied to the flush valve is configured to adjust the pressure resistance It is a configuration provided between the container and the flush valve.
  • the configuration of the expanded bead manufacturing apparatus is not particularly limited as long as it has the configuration.
  • the expanded bead manufacturing apparatus used in the foaming step includes, for example, the expanded bead manufacturing apparatus according to the first or second embodiment.
  • the method for producing a molded body of expanded beads according to the present embodiment is a method for forming the expanded beads obtained by the above-described production method.
  • the expanded beads can be molded by a known method in order to produce molded bodies of expanded beads.
  • a manufacturing apparatus 10 for foamed beads according to aspect 1 of the present invention includes a pressure vessel 1 for foaming polyolefin resin particles (resin particles P0), a valve body 21 and a valve body 22. of the polyolefin resin particles to a low-pressure container (transport pipe 4), a discharge pipe 3 for discharging the foamed particles P discharged from the flash valve 20, and the flash valve 20. and an adjusting unit 5 for adjusting the amount of polyolefin resin particles to be added, and the adjusting unit 5 is provided between the pressure vessel 1 and the flush valve 20 .
  • the expanded bead manufacturing apparatus 10 according to aspect 2 of the present invention is, in aspect 1, provided with a receiving portion 52c that closely contacts and receives the valve body 22 when the flush valve 20 is closed. This is the configuration provided in the unit 5 .
  • the expanded bead manufacturing apparatus 10 is, in aspect 1, provided with a receiving portion 21d that closely contacts and receives the valve body 22 when the flush valve 20A is closed, and the receiving portion 21d includes the valve This is the configuration provided in the main body 21 .
  • the adjustment unit 5 includes a first communication port (communication port 52a) communicating with the pressure container 1, and the flash A tubular portion 52 having a second communication port (communication port 52b) that communicates with the valve 20; a shaft 51 connected to the flush valve 22 and configured to move toward the first communication port in conjunction with the opening of the flush valve 20, and the shaft 51 and the first communication port move the polyolefin In this configuration, gaps 6 are formed through which the system resin particles pass.
  • the expanded bead manufacturing apparatus 10 according to aspect 5 of the present invention is configured such that, in aspect 4, the first communication port (communication port 52 a ) has a smaller diameter than the outlet 1 a of the pressure vessel 1 .
  • the expanded bead manufacturing apparatus 10 according to aspect 6 of the present invention is configured such that, in aspect 4 or 5, the dimension of the gap 6 is 0.1 mm to 10 mm.
  • the size of the cylindrical portion 52 in the direction of the axis E of the valve body 22 is the same as the size of the flush valve 20.
  • the composition is 40% to 90%.
  • the expanded bead manufacturing apparatus 10 according to aspect 8 of the present invention is, in any one of aspects 4 to 7, in the flush valve 20, by changing the lowering distance of the valve body 22, the communication port 52b (second communication The opening of the valve can be adjusted by changing the area occupied by the gap between the opening and the valve body 22 .
  • an expanded bead manufacturing apparatus 10 according to any one of the first to eighth aspects, wherein the flush valve 20 is arranged so that the discharge pipe 3 is inclined with respect to the direction in which the valve body 22 extends. It is configured to be connected to the valve body 21 .
  • valve body 21 communicates with the discharge pipe 3 via a connection port 21c, and the valve body 21 It has a guide surface 21e that guides the polyolefin resin particles that have flowed into 21 to the connection port 21c.
  • the foamed bead manufacturing apparatus 10 is, in aspect 10, configured such that the inclination angle of the guide surface 21e with respect to the axis E of the valve body 22 exceeds 0° and is 60° or less.
  • the expanded bead manufacturing apparatus 10 has a configuration in which the guide surface 21e is inclined so that the end 21f on the side of the connection port 21c faces downward.
  • the method for producing expanded beads according to aspect 13 of the present invention is a method comprising the step of producing expanded beads using the apparatus 10 for producing expanded beads according to any one of aspects 1 to 12 of the present invention.
  • a method for producing expanded beads according to aspect 14 of the present invention is a method according to aspect 13, wherein the raw materials for the expanded beads include polyolefin resin particles, a blowing agent, and an aqueous dispersion medium.
  • the method for producing an expanded bead molded article according to aspect 15 of the present invention is a method of molding the expanded beads obtained by the method for producing an expanded bead molded article according to aspect 13 or 14 of the present invention.
  • the adjustment unit has slits, meshes, or holes provided at the exit portion of the pressure container 1 through which the resin particles P0 can pass. It is a composition that is a structure.
  • the total area of the slits, the meshes, or the holes of the adjustment unit is 1 to 15% of the area of the outlet portion of the pressure vessel. is the configuration.
  • the expanded bead manufacturing apparatus 10 according to the eighteenth aspect of the present invention is, in any one of the fourth to eighth aspects, during the opening operation of the flush valve 20, the end portion 51a of the shaft 51 on the pressure vessel 1 side is It is configured such that it does not move below the first position I, which is the position of the first communication port (communication port 52a).
  • the water-based dispersion in the pressure vessel is discharged from the pressure vessel into a low-pressure vessel through a flush valve to produce expanded polyolefin resin particles having an expansion ratio of about 14 times. Obtained.
  • foamed beads were obtained using the manufacturing apparatus equipped with the flush valve 20 and the control unit 5 shown in FIG.
  • the homogeneity of the cell structure of the polyolefin resin foamed particles obtained was evaluated.
  • the obtained polyolefin resin expanded particles were dried at 75°C for 20 hours, cured at room temperature for 1 day or more, and used for the production of a polyolefin resin in-mold expansion molded product by the method described later.
  • the foamed polyolefin resin particles were placed in a pressure vessel, and the foamed particles were impregnated with pressurized air to adjust the internal pressure of the foamed particles to 0.10 MPa ⁇ G.
  • the foamed particles to which internal pressure was applied were filled in a mold of 370 mm ⁇ 320 mm ⁇ 50 mm.
  • the mold and the foamed particles were heated with steam of 0.3 MPa ⁇ G to fuse the polyolefin resin foamed particles to each other to obtain a polyolefin resin in-mold expansion molded product.
  • After releasing the obtained polyolefin resin in-mold foam-molded product from the mold it is dried at 75° C. for 20 hours and further cured at 23° C. for 5 hours or more to obtain a polyolefin resin in-mold foam-molded product. Color unevenness was evaluated.
  • the expanded bead was cut approximately in the middle, taking great care not to break the bubble film.
  • the cut surface was observed with a microscope, and the cell diameter was calculated.
  • the cell diameter was obtained by drawing a line segment corresponding to a length of 2000 ⁇ m and measuring the number of bubbles n through which the line segment passes. Then, the bubble diameter was calculated by 2000/n ( ⁇ m) from the bubble number n.
  • the cell diameter of 10 foamed particles was measured, and the average cell diameter and cell diameter variation were calculated.
  • the uniformity of the cell structure was evaluated by the ratio of cell diameter variation/average cell diameter.
  • the polyolefin resin in-mold expansion molded product was visually observed and evaluated according to the following criteria.
  • Good The black color of the polyolefin resin in-mold expansion molded product is uniform, and there is almost no color unevenness within and between the expanded particles.
  • Impossible The black color of the polyolefin resin in-mold expansion molded product is uneven, and grayish parts are found here and there.
  • Example 1 Polyolefin resin expanded particles and a polyolefin resin in-mold expansion molded product were obtained in the same manner as in Example 1, except that the production apparatus not equipped with the control unit 5 in FIG. 2 was used. The homogeneity of the cell structure was evaluated in the same manner as in Example 1 for the polyolefin-based resin foamed particles thus obtained. In addition, the same method as in Example 1 was used to evaluate color unevenness of the obtained polyolefin resin in-mold expansion molded product.
  • Table 1 shows the results of evaluating the uniformity of the cell structure of the foamed particles and the color unevenness of the in-mold foam molded product in Example 1 and Comparative Example 1.
  • the expanded beads of Example 1 had a ratio of cell diameter variation/average cell diameter of 5.5%, and compared with the expanded beads of Comparative Example 1, the cell structure was uniform. Further, the in-mold expansion-molded product of the expanded beads of Example 1 had a uniform black color, and there was almost no color unevenness within the expanded beads and between the expanded beads. On the other hand, the in-mold expansion-molded product of the expanded beads of Comparative Example 1 had an uneven black color, and grayish portions were found here and there.

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WO2020170694A1 (ja) * 2019-02-18 2020-08-27 株式会社カネカ 熱可塑性樹脂発泡粒子の製造方法、および熱可塑性樹脂発泡粒子
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WO2022163433A1 (ja) * 2021-01-28 2022-08-04 株式会社カネカ 発泡粒子の製造方法および製造装置

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