WO2014077302A1 - ポリグリコール酸固化押出成形物及びその製造方法 - Google Patents
ポリグリコール酸固化押出成形物及びその製造方法 Download PDFInfo
- Publication number
- WO2014077302A1 WO2014077302A1 PCT/JP2013/080751 JP2013080751W WO2014077302A1 WO 2014077302 A1 WO2014077302 A1 WO 2014077302A1 JP 2013080751 W JP2013080751 W JP 2013080751W WO 2014077302 A1 WO2014077302 A1 WO 2014077302A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polyglycolic acid
- solidified
- extruded product
- resin material
- temperature
- Prior art date
Links
- 229920000954 Polyglycolide Polymers 0.000 title claims abstract description 116
- 239000004633 polyglycolic acid Substances 0.000 title claims abstract description 116
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 30
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- 238000005553 drilling Methods 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 24
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- 238000003801 milling Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
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- 229920000704 biodegradable plastic Polymers 0.000 description 4
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- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
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- 229910000008 nickel(II) carbonate Inorganic materials 0.000 description 2
- ZULUUIKRFGGGTL-UHFFFAOYSA-L nickel(ii) carbonate Chemical compound [Ni+2].[O-]C([O-])=O ZULUUIKRFGGGTL-UHFFFAOYSA-L 0.000 description 2
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- RKDVKSZUMVYZHH-UHFFFAOYSA-N 1,4-dioxane-2,5-dione Chemical compound O=C1COC(=O)CO1 RKDVKSZUMVYZHH-UHFFFAOYSA-N 0.000 description 1
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- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- FMRLDPWIRHBCCC-UHFFFAOYSA-L Zinc carbonate Chemical compound [Zn+2].[O-]C([O-])=O FMRLDPWIRHBCCC-UHFFFAOYSA-L 0.000 description 1
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- 238000005452 bending Methods 0.000 description 1
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- 229910052796 boron Inorganic materials 0.000 description 1
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- 239000004917 carbon fiber Substances 0.000 description 1
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- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
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- JJTUDXZGHPGLLC-UHFFFAOYSA-N lactide Chemical compound CC1OC(=O)C(C)OC1=O JJTUDXZGHPGLLC-UHFFFAOYSA-N 0.000 description 1
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- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/002—Combinations of extrusion moulding with other shaping operations combined with surface shaping
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/06—Rod-shaped
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/91—Heating, e.g. for cross linking
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92695—Viscosity; Melt flow index [MFI]; Molecular weight
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
- B29K2033/04—Polymers of esters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/001—Profiled members, e.g. beams, sections
- B29L2031/003—Profiled members, e.g. beams, sections having a profiled transverse cross-section
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/298—Physical dimension
Definitions
- the present invention relates to a polyglycolic acid solidified extruded product and a method for producing the same, and more specifically, a wall thickness or a large diameter that can be formed into a secondary molded product having a desired shape by machining such as cutting, drilling, and cutting.
- the present invention relates to a polyglycolic acid solidified extruded product and a production method thereof.
- a resin molded product having a three-dimensional shape or a complicated shape is generally formed by injection molding.
- injection molding a molded product having a desired shape can be mass-produced.
- an expensive mold having high dimensional accuracy is required.
- the injection-molded product is easily deformed by shrinkage or residual stress after injection molding, it is necessary to precisely adjust the mold shape according to the shape of the molded product or the characteristics of the resin material.
- the defect rate is high, the product is often expensive.
- a resin material is extruded and processed into various shapes such as flat plates, round bars, pipes, odd-shaped products (“cutting materials” and
- cutting materials There is known a method of forming a secondary molded product having a desired shape by manufacturing a machining material such as cutting, drilling, and cutting.
- the machining method for machining materials does not require expensive molds, so that it is possible to manufacture molded products with a small production volume at a relatively low cost, to respond to frequent changes in the specifications of the molded products, and to improve dimensional accuracy.
- Advantages include that a high molding can be obtained and that a molding having a complicated shape and a large thickness that are not suitable for injection molding can be produced.
- machining materials for example, it is thick and excellent in machinability, has little residual stress, does not generate excessive deformation due to frictional heat generated during machining, and does not cause deformation or discoloration. It is required to satisfy high-level required characteristics such as being capable of processing.
- Patent Document 1 discloses a resin composition containing engineering plastics such as polyether ether ketone, polyether imide, polyphenylene sulfide, polysulfone, polyether sulfone, and polycarbonate.
- engineering plastics such as polyether ether ketone, polyether imide, polyphenylene sulfide, polysulfone, polyether sulfone, and polycarbonate.
- biodegradable plastics are attracting attention as environmentally friendly polymer materials, and their applications are expanded to extrusions such as films and sheets, blow moldings such as bottles, and injection moldings.
- biodegradable plastics there has been an increasing demand for application of biodegradable plastics to machining materials.
- Polyglycolic acid has superior crystallinity in terms of tensile strength, tensile elongation, bending strength, flexural modulus, hardness, flexibility, heat resistance, etc., compared to other biodegradable plastics such as polylactic acid It is a biodegradable plastic that has a gas barrier property comparable to or surpassing that of a general-purpose gas barrier resin.
- Polyglycolic acid can be formed into a film or sheet by extrusion.
- Patent Document 2 discloses a method of forming polyglycolic acid into a sheet by extrusion molding. The sheet has a thickness of 0.01 to 5 mm, and it is disclosed that various sheet molded products are produced by taking advantage of characteristics such as toughness, heat resistance, and transparency.
- Patent Document 3 discloses a polyglycolic acid solidified extrudate having a thickness or diameter of 5 to 100 mm obtained by solidifying and extruding polyglycolic acid. Specifically, it is formed from a resin material containing polyglycolic acid having a melt viscosity measured at a temperature of 270 ° C. and a shear rate of 120 sec ⁇ 1 of 10 to 1,500 Pa ⁇ s, particularly preferably 70 to 900 Pa ⁇ s, Polyglycolic acid solidified extrudates having a density of 1.575 to 1.625 g / cm 3 and a thickness or diameter of 5 mm to 100 mm are disclosed.
- Patent Document 3 if the thickness or diameter is too large (that is, the thickness or diameter exceeds 100 mm), it becomes difficult to sufficiently remove or reduce the residual stress even if the solidified extruded product is heat-treated, It is described that when a solidified extruded product having a large residual stress is machined, the resulting secondary molded product is likely to be deformed.
- Downhole is required for the recovery of hydrocarbon resources from geological formations including hydrocarbon resources (in the present invention, sometimes referred to simply as “oil”) such as petroleum (shale oil, etc.) and gas (shale gas, etc.). (Underground excavation mine) is provided.
- a downhole tool which is a member used for the formation, repair or promotion of resource recovery, or a member thereof, that is, a downhole tool member (for example, a core material of a plug for oil drilling is well known). Since it can be disintegrated in the downhole without being collected on the ground after use, use of a degradable plastic is expected.
- JP 2005-226031 A (corresponding to US Patent Application Publication No. 2008/0038517) Japanese Patent No. 4073052 (corresponding to US Pat. No. 5,908,917) JP 2010-69718 A
- An object of the present invention is to provide a decomposability that can be formed into secondary molded products of various desired shapes by machining such as cutting, drilling, cutting, etc., particularly downhole tools or ball sealers for oil drilling that is a member thereof.
- An object of the present invention is to provide a resin-solidified extruded product and a production method thereof.
- the present inventors have optimized the melt viscosity of polyglycolic acid, solidified extrusion molding conditions, etc., in particular, by pressing the solidified extrudate and solidifying extrudate. It has been found that by controlling the expansion in the thickness direction or the diameter direction of the resin, a decomposable resin-solidified extruded product having a thickness or diameter exceeding 100 mm, specifically, a polyglycolic acid-solidified extruded product can be obtained. Completed the invention.
- the present invention is formed from a resin material containing polyglycolic acid having a melt viscosity of 200 to 2,000 Pa ⁇ s measured at a temperature of 270 ° C. and a shear rate of 120 sec ⁇ 1 , and has a thickness of more than 100 mm and not more than 500 mm.
- a polyglycolic acid solidified extrudate having a diameter is provided.
- polyglycolic acid-solidified extrudates (1) to (4) are provided as embodiments.
- steps 1 to 4 a) A resin material containing polyglycolic acid having a melt viscosity of 200 to 2,000 Pa ⁇ s measured at a temperature of 270 ° C. and a shear rate of 120 sec ⁇ 1 is supplied to an extruder, and the cylinder temperature of the extruder is 240 to 285.
- Step 4 of obtaining a polyglycolic acid solidified extruded product of A process for producing a polyglycolic acid-solidified extruded product comprising
- step 3 using a forming die in which heating means are arranged in addition to cooling means, first, the molten extrudate in the flow path near the exit of the extrusion die is heated to a temperature of 230 to 290 ° C. by the heating means. And then solidifying the molten extrudate in the channel by cooling to a temperature lower than the crystallization temperature of the polyglycolic acid by cooling means.
- a downhole tool formed by cutting the polyglycolic acid solidified extruded product or a member thereof, in particular, an oil drilling plug or a plug core material, an oil having a diameter of 20 to 200 mm.
- the present invention is formed from a resin material containing polyglycolic acid having a melt viscosity of 200 to 2,000 Pa ⁇ s measured at a temperature of 270 ° C. and a shear rate of 120 sec ⁇ 1 , and has a thickness or diameter of more than 100 mm and not more than 500 mm
- the polyglycolic acid solidified extruded product having the following characteristics can be formed into a secondary molded product, particularly a ball sealer for oil drilling, by machining such as cutting, drilling, and cutting: And the effect that the ball sealer for oil drilling etc. can be provided is produced.
- residual stress is reduced, the hardness, strength, flexibility, etc. are excellent, and various properties suitable for machining into secondary molded products, especially oil drilling ball sealers, etc.
- a polyglycolic acid-solidified extruded product can be provided.
- the polyglycolic acid-solidified extruded product of the present invention is a resin material containing polyglycolic acid having a melt viscosity of 200 to 2,000 Pa ⁇ s measured at a temperature of 270 ° C. and a shear rate of 120 sec ⁇ 1. And is a polyglycolic acid-solidified extruded product having a thickness or diameter of more than 100 mm and not more than 500 mm.
- the polyglycolic acid used in the present invention is a polymer containing a repeating unit represented by (Formula 1)-(— O—CH 2 —CO —) —.
- the proportion of the repeating unit represented by (Formula 1) is usually 50% by mass or more, preferably 70% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, particularly preferably. It is 95 mass% or more, Most preferably, it is 99 mass% or more.
- the ratio of the repeating unit represented by (Formula 1) is less than 70% by mass, the toughness, crystallinity, heat resistance, hardness, gas barrier properties, and the like tend to decrease. In many cases, it is most preferable to use a homopolymer of polyglycolic acid in which the ratio of the repeating unit represented by (Formula 1) is 100% by mass.
- Polyglycolic acid can be produced by condensation polymerization of glycolic acid or ring-opening polymerization of glycolide.
- the repeating unit other than the repeating unit represented by (Formula 1) for example, a repeating unit derived from a cyclic monomer such as ethylene oxalate, lactide, lactones, trimethylene carbonate, 1,3-dioxane is preferable. It is not limited to these.
- the melting temperature of polyglycolic acid can be lowered to lower the processing temperature, thereby reducing the thermal decomposition at the time of melt processing. be able to.
- the extrusion rate can be improved by controlling the crystallization rate of polyglycolic acid by copolymerization.
- too many repeating units are derived from the cyclic monomer, the crystallinity inherent to polyglycolic acid is impaired, and the toughness and heat resistance of the resulting solidified extruded product may be significantly reduced.
- the polyglycolic acid used in the present invention is preferably a high molecular weight polymer.
- the melt viscosity of the polyglycolic acid used in the present invention measured at a temperature of 270 ° C. and a shear rate of 120 sec ⁇ 1 is 200 to 2,000 Pa ⁇ s, preferably 450 to 1,600 Pa ⁇ s, more preferably 700 to 1, 400 Pa ⁇ s, particularly preferably 850 to 1,300 Pa ⁇ s, most preferably 910 to 1,200 Pa ⁇ s.
- melt viscosity of polyglycolic acid is too low, melt extrusion and solid extrusion molding become difficult, and the flexibility and toughness of the resulting solid extrusion molding are reduced, and cracking is likely to occur during machining. If the melt viscosity of polyglycolic acid is too low, cracks may occur during heat treatment (annealing) of the solidified extruded product. If the melt viscosity of the polyglycolic acid is too high, the polyglycolic acid is likely to be thermally deteriorated because it must be heated to a high temperature during melt extrusion.
- the resin material used in the present invention is a resin composition containing polyglycolic acid as a main component.
- the main component means that the content of polyglycolic acid in the resin component is usually 50% by mass or more, preferably 70% by mass or more, more preferably 80% by mass or more, and further preferably 90% by mass or more.
- other resin components include thermoplastic resins other than polyglycolic acid, for example, other biodegradable resins such as polylactic acid.
- a resin composition in which the content of polyglycolic acid in the resin component is 100% by mass may be used.
- the resin material used in the present invention can contain colorants such as dyes and pigments.
- a colorant By using a colorant, it is possible to obtain a polyglycolic acid-solidified extruded product that has a high-class feeling and is easy to cut.
- a pigment is preferable in terms of excellent heat resistance.
- pigments of various colors used in the technical field of synthetic resins such as a yellow pigment, a red pigment, a white pigment, and a black pigment, can be used.
- carbon black is particularly preferable. Examples of carbon black include acetylene black, oil furnace black, thermal black, and channel black.
- the resin material used in the present invention is preferably a polyglycolic acid composition containing 0.001 to 5% by mass of a colorant based on the total amount.
- the content of the colorant is preferably 0.01 to 3% by mass, more preferably 0.05 to 2% by mass.
- the colorant can be melt-kneaded with polyglycolic acid, but if desired, a polyglycolic acid composition (masterbatch) having a high concentration of colorant is prepared, and this masterbatch is diluted with polyglycolic acid.
- a resin material having a desired colorant concentration can also be prepared. From the viewpoint of uniform dispersibility of the colorant, it is preferable to prepare a resin material in which polyglycolic acid and the colorant are melt-kneaded and pelletized.
- the resin material used in the present invention may contain a filler for the purpose of improving mechanical strength and heat resistance.
- a filler for the purpose of improving mechanical strength and heat resistance.
- a fibrous filler or a granular or powder filler can be used, but a fibrous filler is preferable.
- the fibrous filler examples include inorganic fibers such as glass fiber, carbon fiber, asbestos fiber, silica fiber, alumina fiber, zirconia fiber, boron nitride fiber, silicon nitride fiber, boron fiber, potassium titanate fiber; stainless steel, aluminum Metal fibrous materials such as titanium, steel, and true record; high-melting organic fibrous materials such as polyamide, fluororesin, polyester resin, and acrylic resin.
- inorganic fibers such as glass fiber, carbon fiber, asbestos fiber, silica fiber, alumina fiber, zirconia fiber, boron nitride fiber, silicon nitride fiber, boron fiber, potassium titanate fiber
- stainless steel aluminum Metal fibrous materials such as titanium, steel, and true record
- high-melting organic fibrous materials such as polyamide, fluororesin, polyester resin, and acrylic resin.
- short fibers having a length of 10 mm or less, more preferably 1 to 6 mm, and further preferably 1.5 to 4 mm are preferable,
- Granular or powder fillers include mica, silica, talc, alumina, kaolin, calcium sulfate, calcium carbonate, titanium oxide, ferrite, clay, glass powder, zinc oxide, nickel carbonate, iron oxide, quartz powder, magnesium carbonate, Barium sulfate or the like can be used.
- fillers can be used alone or in combination of two or more.
- the filler may be treated with a sizing agent or a surface treatment agent as necessary.
- a sizing agent or surface treating agent include functional compounds such as epoxy compounds, isocyanate compounds, silane compounds, and titanate compounds. These compounds may be used after being subjected to surface treatment or sizing treatment on the filler in advance, or may be added simultaneously with the preparation of the resin composition.
- the resin material used in the present invention is preferably a polyglycolic acid composition containing 5 to 70% by mass of a filler based on the total amount.
- the content of the filler is preferably 10 to 60% by mass, more preferably 15 to 50% by mass, and still more preferably 20 to 40% by mass.
- the filler can be melt-kneaded with polyglycolic acid, but if desired, a polyglycolic acid composition (masterbatch) with a high concentration of filler is prepared, and this masterbatch is diluted with polyglycolic acid.
- a resin material having a desired filler concentration can also be prepared. From the viewpoint of uniform dispersibility of the filler, it is preferable to prepare a resin material in which polyglycolic acid and the filler are melt-kneaded and pelletized.
- additives for example, impact modifiers, resin modifiers, mold corrosion inhibitors such as zinc carbonate and nickel carbonate, lubricants, thermosetting resins, oxidation Inhibitors, ultraviolet absorbers, nucleating agents such as boron nitride, flame retardants, and the like can be added as appropriate.
- the polyglycolic acid-solidified extruded product of the present invention is a polyglycolic acid-solidified extruded product that is formed from a resin material containing the polyglycolic acid and has a thickness or diameter of more than 100 mm and not more than 500 mm, its density (
- the density of the resin part other than the filler part is not particularly limited, but is preferably 1,570 to 1,610 kg / m 3 , more preferably 1,575 to 1,605 kg / m 3 , and still more preferably 1 , 577 to 1,603 kg / m 3 , particularly preferably 1,580 to 1,600 kg / m 3 .
- the density of the polyglycolic acid solidified extruded product is too low, the strength, hardness, toughness, flexibility and the like are lowered, and cracks are likely to occur during machining such as cutting, drilling and cutting. If the density of the polyglycolic acid-solidified extruded product is too high, it is difficult to produce.
- the thickness or diameter of the polyglycolic acid solidified extruded product is more than 100 mm and 500 mm or less, preferably 102 to 400 mm, more preferably 103 to 350 mm, still more preferably 105 to 300 mm, and particularly preferably 106 to 250 mm.
- solidified extrudates with satisfactory machinability can be obtained within this thickness or diameter in the range of 107-200 mm, most preferably the thickness or diameter is in the range of 108-150 mm.
- the thickness or diameter is too small, it becomes difficult to form a secondary molded product having a desired shape by machining such as cutting. That is, since the rigidity is small and flexible, mechanical drilling by drilling or drilling is difficult or substantially impossible.
- the thickness or diameter is too large, it is difficult to sufficiently remove or reduce the residual stress even if the solidified extruded product is heat-treated. When a solidified extruded product having a large residual stress is machined, the resulting secondary molded product is likely to be deformed.
- the polyglycolic acid solidified extruded product of the present invention includes solid extruded products of various shapes such as round bars, flat plates, pipes, irregular shaped products, etc., but solidified extrusion molding and subsequent densification treatment are easy.
- the shape is preferably a round bar or a flat plate in that it is often suitable for a solidified extruded product, which is a material for machining, and is a round bar for the formation of a ball sealer for oil drilling to be described later. It is more preferable.
- the polyglycolic acid-solidified extruded product of the present invention may have different densities of the surface portion and the central portion of the molded product.
- the difference in density between the surface portion and the central portion is preferably 0.5 to 50 kg / m 3 , more preferably 1.5 to 20 kg / m 3 , still more preferably 2.0 to 10 kg / m 3 , particularly preferably.
- the range is 2.5 to 5 kg / m 3 .
- the polyglycolic acid-solidified extruded product of the present invention can be produced by a production method including the following steps 1 to 4.
- a resin material containing polyglycolic acid having a melt viscosity of 200 to 2,000 Pa ⁇ s measured at a temperature of 270 ° C. and a shear rate of 120 sec ⁇ 1 is supplied to an extruder, and the cylinder temperature of the extruder is 240 to 285.
- Step 4 of obtaining a polyglycolic acid-solidified extruded product.
- step 1 a resin material containing polyglycolic acid is put into a hopper of an extruder. Pellets are preferably used as the resin material. It is preferable that the resin material is sufficiently dried and dehumidified before molding.
- the dehumidifying and drying conditions are not particularly limited. For example, it is preferable to adopt a method of holding the pellets at 100 to 160 ° C. in a dry heat atmosphere for about 1 to 24 hours.
- step 1 the resin material is melted and kneaded in the cylinder of the extruder.
- the cylinder temperature is adjusted to 240 to 285 ° C, preferably 245 to 275 ° C, more preferably 247 to 273 ° C.
- the temperature of each heating means is made different from each other within the above range.
- the temperature of each heating means may be controlled to the same temperature.
- step 2 the resin material melted by melt kneading is melt extruded from the extrusion die at the tip of the extruder.
- the molten resin material from the extrusion die is extruded into the flow path of the forming die provided with a flow path communicating with the molten resin passage of the extrusion die and having a cross-sectional shape of the extruded product, and cooling means.
- the cross-sectional shape of the extrudate is a rectangle when the extrudate is a flat plate, and a circle when it is a round bar.
- step 3 the molten extrudate made of a resin material is cooled and solidified in the flow path of the forming die, and then the solidified extrudate is extruded to the outside from the tip of the forming die.
- the extrusion speed is usually 5 to 27 mm / 10 minutes, preferably 10 to 25 mm / 10 minutes.
- step 3 a forming die in which heating means is arranged in addition to cooling means is used.
- the molten extrudate in the flow path near the extrusion die outlet is heated at 230 to 290 ° C., preferably 250 to 290 ° C. by the heating means. It is possible to employ a method of heating to a temperature of 285 ° C. and then cooling and solidifying the molten extrudate in the flow path, particularly its surface portion, to a temperature lower than the crystallization temperature of the polyglycolic acid by a cooling means. preferable. When the temperature near the exit of the extrusion die is rapidly cooled, the progress of crystallization of polyglycolic acid may be slow.
- the crystallization of the molten extrudate, particularly its surface portion can be promoted. Even when the outlet temperature of the extrusion die is within the above range, the temperature of the melted extrudate, particularly the surface portion thereof, in the flow path near the extrusion die outlet can be within the above range.
- the temperature of the extruded product, particularly its surface portion, is cooled to a temperature lower than the crystallization temperature of polyglycolic acid and solidified.
- the crystallization temperature of polyglycolic acid (the crystallization temperature detected when the temperature is lowered from the molten state) is usually about 130 to 140 ° C.
- the cooling temperature of the cooling means is preferably 100 ° C. or lower, more preferably 90 ° C. or lower.
- the lower limit of the cooling temperature is preferably 40 ° C, more preferably 50 ° C.
- the crystallization temperature of polyglycolic acid may increase due to melt-kneading in the cylinder of the extruder.
- the temperature is preferably within the above range.
- the heating means includes, for example, a heater as a heating source.
- the cooling means includes, for example, a water cooling pipe that can circulate cooling water as a refrigerant.
- step 4 the solidified extrudate is pressurized and taken out while applying a back pressure in the forming die direction. At this time, the solidified extrudate is prevented from expanding in the thickness direction or the diameter direction by pressurization.
- a polyglycolic acid solidified extruded product having a diameter of more than 100 mm and 500 mm or less is obtained.
- the pressing means include a combination of an upper roll group and a lower roll group.
- the solidified extrudate can be pressurized by a method in which a lower roll group is placed on a table and a load is applied to the upper roll group.
- the solidified extrudate may be pressurized by applying a load in the upper direction to the lower roll group and applying a load in the lower direction to the upper roll group.
- back pressure in the forming die direction can be applied.
- a back pressure in the direction of the forming die may be applied to the solidified extruded product in combination with an appropriate loading means.
- the magnitude of the back pressure is usually in the range of 1,500 to 8,500 kg, preferably 1,600 to 8,000 kg, more preferably 1,800 to 7,000 kg, and still more preferably 2,000 to 6,000 kg.
- This back pressure can be measured as the die external pressure (pressure applied to the flow path).
- the thickness or diameter of the finally obtained solid extrudate is adjusted to be in the range of more than 100 mm and 500 mm or less. To do. After pressing, the solidified extrusion is taken up.
- the solidified extruded product is a round bar
- a roll group surrounding the round bar-shaped solidified extruded product is arranged.
- the method of pressurizing the solidified extrudate discharged from the forming die can apply a back pressure in the direction of the forming die, and suppresses expansion in the thickness direction or the diameter direction of the solidified extrudate by pressurization. Any method can be adopted as long as it can be adjusted so that the thickness or diameter of the solidified extruded product to be obtained is in the range of more than 100 mm and 500 mm or less.
- the polyglycolic acid extrudate obtained in step 4 is preferably annealed by placing step 5 of heat treatment at a temperature of 150 to 230 ° C. for 3 to 24 hours.
- step 5 of heat treatment it is possible to remove the residual stress of the solidified extruded product, and to prevent inconvenience such as deformation in the solidified extruded product itself and the secondary molded product after machining.
- the heat treatment temperature is preferably 175 to 225 ° C, more preferably 185 to 215 ° C.
- the heat treatment time is preferably 4 to 20 hours, more preferably 5 to 15 hours.
- the polyglycolic acid solidified extrudate produced by the production method of the present invention can have various shapes such as round bars, flat plates, pipes, irregular shaped articles, etc., but solidified extruding and subsequent densification treatment are easy.
- it is preferably in the shape of a round bar or a flat plate, more preferably in the shape of a round bar because it is often suitable for a machining material.
- a broad-cutting method may include drilling as well as cutting.
- Cutting methods include turning using a single-edged tool, grinding, planing, and boring.
- Cutting methods using multiple blades include milling, drilling, threading, gear cutting, mold carving, and file processing.
- drilling using a drill or the like may be distinguished from cutting.
- Cutting methods include cutting with a blade (saw), cutting with abrasive grains, and cutting by heating and melting.
- a grinding finishing method, a plastic working method such as punching using a knife-like tool or scribing, and a special processing method such as laser processing can also be applied.
- the solidified extrudate which is a raw material for machining
- the solidified extrudate is cut into an appropriate size or thickness, and the solidified by cutting.
- the extruded product is ground and trimmed to a desired shape, and further, drilling is performed at a necessary location. Finally, finish processing is performed if necessary.
- the order of machining is not limited to this.
- the solidified extruded product is melted by frictional heat during machining and it is difficult to produce a smooth surface, it is desirable to perform machining while cooling the cutting surface. If the solidified extruded product excessively generates heat due to frictional heat, it causes deformation and coloring. Therefore, the solidified extruded product or the processed surface is preferably controlled to a temperature of 200 ° C. or lower, more preferably 150 ° C. or lower. .
- the polyglycolic acid-solidified extruded product of the present invention comprises a machining material for molding into secondary molded products such as various resin parts by performing machining such as cutting, drilling and cutting. can do.
- Secondary molded products include various materials (downhole tools) used for downholes used for excavation of hydrocarbon resources such as oil and gas (sometimes referred to as “petroleum” as mentioned above). Is mentioned. That is, as the secondary molded product, a downhole tool formed from a decomposable material or a member thereof, for example, a plug for oil drilling or a core material of the plug is exemplified, and in particular, for oil drilling formed from a decomposable material. Ball sealer.
- a downhaul tool having a large diameter of 20 mm or more, optionally 50 mm or more, more desirably 70 mm or more, and particularly 90 mm or more if desired. That member, in particular a ball sealer, can be obtained.
- the upper limit of the diameter of a ball sealer or the like is usually 300 mm, and in many cases 200 mm.
- a downhole tool or a member thereof such as a ball sealer for oil drilling with a diameter of 20 to 200 mm, is manufactured. can do.
- the diameter of an oil drilling ball sealer or the like is more preferably 30 to 170 mm, still more preferably 50 to 150 mm, and particularly preferably 70 to 120 mm.
- the polyglycolic acid-solidified extruded product of the present invention can be formed into other secondary molded products by machining.
- wafer carrier, wafer cassette, spin chuck, tote bin, wafer boat, IC chip tray, IC chip carrier, IC transfer tube, IC test socket, burn-in socket, pin grid array socket, quad flat package, lead Examples include less chips carriers, dual in-line packages, small outline packages, reel packing, various cases, storage trays, transport device parts, and magnetic card readers.
- various roll members in image forming apparatuses such as electrophotographic copying machines and electrostatic recording apparatuses, transfer drums for recording apparatuses, printed circuit board cassettes, bushes, paper and bill transport parts, paper feed rails, font cartridges, Ink ribbon canisters, guide pins, trays, rollers, gears, sprockets, computer housings, modem housings, monitor housings, CD-ROM housings, printer housings, connectors, computer slots, and the like.
- Example 1 Polyglycolic acid pellets having a melt viscosity of 920 Pa ⁇ s measured at a temperature of 270 ° C. and a shear rate of 120 sec ⁇ 1 were held at a temperature of 140 ° C. for 6 hours and dehumidified and dried.
- the extrusion speed was about 18 mm / 10 minutes.
- Polyglycol is adjusted to 3,200 kg of forming die external pressure (back pressure) by pressurizing the solidified extruded product solidified in the flow path of the forming die between the upper roll group and the lower roll group. Swelling of the acid-solidified extrusion was suppressed.
- the solidified extrusion was heat treated at a temperature of 205 ° C. for 10 hours to remove residual stress. The heat treatment did not cause cracking or deformation in the solidified extruded product.
- a round bar-shaped polyglycolic acid solidified extruded product having a diameter of 120 mm and a length of 1,000 mm was obtained.
- the outer surface portion in the radial direction and the central portion (radius 10 mm) of the sample (three pieces) cut out in the radial direction at the position of 5 mm and the position of the central portion from both ends in the length direction.
- the density of the outer surface portion was 1,581.1 kg / m 3
- the density of the center portion was 1,584.2 kg / m 3 (average value of three samples).
- Example 2 A polyglycolic acid having a melt viscosity of 920 Pa ⁇ s measured at a temperature of 270 ° C. and a shear rate of 120 sec ⁇ 1 and glass fiber (Owens Corning, 03JAFT592S, length 3 mm) were melt-kneaded at a mass ratio of 70:30. A round with a diameter of 120 mm and a length of 1,000 mm was obtained in the same manner as in Example 1 except that the pellets of the resin material thus prepared were dehumidified and dried at a temperature of 120 ° C. for 6 hours. A rod-shaped polyglycolic acid-solidified extruded product was obtained.
- Example 1 The same operation as in Example 1 was performed to obtain a round bar-shaped polyglycolic acid solidified extruded product having a diameter of 30 mm and a length of 1,000 mm. The heat treatment did not cause cracking or deformation in the solidified extruded product.
- Example 2 From Example 1 and Example 2, it is formed from a resin material containing polyglycolic acid having a melt viscosity of 200 to 2,000 Pa ⁇ s measured at a temperature of 270 ° C. and a shear rate of 120 sec ⁇ 1 , and is more than 100 mm and not more than 500 mm Polyglycolic acid solidified extrudates with thickness or diameter have excellent machinability and can be formed into secondary molded products, especially oil drilling ball sealers by machining such as cutting, drilling and cutting. It turns out that. On the other hand, it is formed from a resin material containing polyglycolic acid having a melt viscosity of 100 Pa ⁇ s measured at a temperature of 270 ° C.
- Polyglycolic acid solidified extruded products are deformed by heat treatment to relieve stress, and it is found that cracking may occur due to cutting and cutting machining, and beautiful processed surfaces may not be obtained. It was.
- the melt viscosity measured at a temperature of 270 ° C. and a shear rate of 120 sec ⁇ 1 is 200 to 2,000 Pa ⁇ Due to the material difference between the resin material containing polyglycolic acid of s and the resin material containing polyglycolic acid having a melt viscosity of 100 Pa ⁇ s, there is no significant difference in machinability and heat resistance. I understood that.
- a resin material containing polyglycolic acid having a melt viscosity of 200 to 2,000 Pa ⁇ s measured at a temperature of 270 ° C. and a shear rate of 120 sec ⁇ 1 is selected, and a specific solidification extrusion molding is performed. It was found that the above process should be adopted.
- the polyglycolic acid solidified extruded product of the present invention is formed from a resin material containing polyglycolic acid having a melt viscosity of 200 to 2,000 Pa ⁇ s measured at a temperature of 270 ° C. and a shear rate of 120 sec ⁇ 1 , and exceeds 100 mm.
- the polyglycolic acid-solidified extruded product having a thickness or diameter of 500 mm or less has high processing accuracy and is suitable for molding secondary molded products such as various resin parts by machining, and particularly has a diameter of 20 to 200 mm. Since it is suitable for molding a downhole tool such as a ball sealer for oil drilling or its members, the industrial applicability is high.
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Abstract
Description
(1)丸棒または平板の形状を有する前記のポリグリコール酸固化押出成形物。
(2)前記樹脂材料が、全量基準で0.001~5質量%の着色剤を含有するポリグリコール酸組成物である前記のポリグリコール酸固化押出成形物。
(3)前記樹脂材料が、全量基準で5~70質量%の充填剤を含有するポリグリコール酸組成物である前記のポリグリコール酸固化押出成形物。
(4)機械加工用素材である前記のポリグリコール酸固化押出成形物。
a)温度270℃及び剪断速度120sec-1で測定した溶融粘度が200~2,000Pa・sのポリグリコール酸を含有する樹脂材料を、押出機に供給し、該押出機のシリンダー温度240~285℃で溶融混練する工程1;
b)該押出機先端の押出ダイから、溶融混練によって溶融した樹脂材料を、該押出ダイの溶融樹脂通路と連通しかつ押出成形物の断面形状を有する流路と、冷却手段とを備えたフォーミングダイの流路内に押出する工程2;
c)該フォーミングダイの流路内で樹脂材料からなる溶融押出物を冷却して固化させ、次いで、該フォーミングダイの先端から固化押出物を外部に押出する工程3;並びに
d)該固化押出物を加圧して、該フォーミングダイ方向に背圧をかけながら引き取り、その際、加圧によって該固化押出物の厚み方向または直径方向への膨張を抑制して、厚みまたは直径が100mmを超え500mm以下のポリグリコール酸固化押出成形物を得る工程4;
を含むポリグリコール酸固化押出成形物の製造方法が提供される。
(i)前記工程3において、冷却手段に加えて加熱手段を配置したフォーミングダイを使用し、先ず、加熱手段によって、押出ダイ出口付近の流路内にある溶融押出物を230~290℃の温度に加熱し、次いで、冷却手段によって、流路内の溶融押出物を該ポリグリコール酸の結晶化温度未満の温度に冷却して固化させる前記の製造方法。
(ii)前記工程4で得られたポリグリコール酸固化押出成形物を、150~230℃の温度で3~24時間熱処理する工程5をさらに含む前記の製造方法。
(iii)前記樹脂材料が、全量基準で0.001~5質量%の着色剤を含有するポリグリコール酸組成物である前記の製造方法。
(iv)前記樹脂材料が、全量基準で5~70質量%の充填剤を含有するポリグリコール酸組成物である前記の製造方法。
(v)前記工程4において、丸棒または平板の形状を有するポリグリコール酸固化押出成形物を得る前記の製造方法。
本発明のポリグリコール酸固化押出成形物は、温度270℃及び剪断速度120sec-1で測定した溶融粘度が200~2,000Pa・sのポリグリコール酸を含有する樹脂材料から形成され、100mmを超え500mm以下の厚みまたは直径を有するポリグリコール酸固化押出成形物である。
本発明のポリグリコール酸固化押出成形物は、下記工程1乃至4を含む製造方法によって製造することができる。
b)該押出機先端の押出ダイから、溶融混練によって溶融した樹脂材料を、該押出ダイの溶融樹脂通路と連通しかつ押出成形物の断面形状を有する流路と、冷却手段とを備えたフォーミングダイの流路内に押出する工程2;
c)該フォーミングダイの流路内で樹脂材料からなる溶融押出物を冷却して固化させ、次いで、該フォーミングダイの先端から固化押出物を外部に押出する工程3;並びに
d)該固化押出物を加圧して、該フォーミングダイ方向に背圧をかけながら引き取り、その際、加圧によって該固化押出物の厚み方向若しくは直径方向への膨張を抑制して、厚みまたは直径が100mmを超え500mm以下のポリグリコール酸固化押出成形物を得る工程4。
本発明のポリグリコール酸固化押出成形物は、切削、穴あけ、切断などの機械加工を行うことにより、様々な樹脂部品などの二次成形物に成形するための機械加工用素材とすることができる。二次成形物としては、石油やガス等の炭化水素資源(先に述べたように、単に「石油」ということがある。)の掘削に使用するダウンホールに使用する諸部材(ダウンホールツール)が挙げられる。すなわち、二次成形物として、分解性材料から形成されたダウンホールツールまたはその部材、例えば、石油掘削用プラグまたは該プラグの芯材が挙げられ、特に、分解性材料から形成された石油掘削用ボールシーラーが挙げられる。本発明のポリグリコール酸固化押出成形物を切削加工することにより、直径20mm以上、所望により直径50mm以上、更に所望により直径70mm以上、特に所望する場合は直径90mm以上の大径のダウンホールツールまたはその部材、特にボールシーラーを得ることができる。ボールシーラー等の直径の上限は、通常300mm、多くの場合200mmである。
厚み約0.2mmのポリグリコール酸の非晶シートを約150℃で5分間加熱して結晶化させた試料を用い、D=0.5mm、L=5mmのノズル装着キャピログラフ〔株式会社東洋精機製作所製〕を用いて、温度270℃及び剪断速度120sec-1で試料の溶融粘度を測定した。
ポリグリコール酸固化押出成形物から切り出した試料を、JIS R 7222(n-ブタノールを用いたピクノメーター法)に従って測定した。
温度270℃及び剪断速度120sec-1で測定した溶融粘度が920Pa・sのポリグリコール酸のペレットを、温度140℃で6時間保持して除湿乾燥した。除湿乾燥したペレットをL/D=20の30mmφ単軸押出機のホッパーに供給し、シリンダー温度251℃で溶融混練し、押出ダイ出口温度276℃で、フォーミングダイの流路内に溶融押出し、冷却温度80℃で冷却し固化させた。押出速度は、約18mm/10分であった。
温度270℃及び剪断速度120sec-1で測定した溶融粘度が920Pa・sのポリグリコール酸とガラスファイバー〔オーエンス・コーニング社製、03JAFT592S、長さ3mm〕とを質量比70:30で溶融混練して調製した樹脂材料のペレットを、温度120℃で6時間保持して除湿乾燥したものを原料として用いたことを除いて、実施例1と同様にして、直径が120mm、長さ1,000mmの丸棒状ポリグリコール酸固化押出成形物を得た。
温度270℃及び剪断速度120sec-1で測定した溶融粘度が100Pa・sのポリグリコール酸のペレットを原料として用いたことを除いて、実施例1と同様にして、直径が120mm、長さ1,000mmの丸棒状ポリグリコール酸固化押出成形物を製造したところ、温度205℃で10時間熱処理する工程で、一部にくびれなどの変形が観察された。
実施例1と同様の操作を行い、直径が30mm、長さ1,000mmの丸棒状ポリグリコール酸固化押出成形物を得た。熱処理によって、固化押出成形物に割れや変形を生じることはなかった。
比較例1と同様の操作を行い、直径が30mm、長さ1,000mmの丸棒状ポリグリコール酸固化押出成形物を得た後、得られた丸棒を、ミーリングカッターを用いて切断したところ、割れを誘発することなく切断することができた。熱処理によって、固化押出成形物に割れや変形を生じることはなかった。その切断面には、混練不足に起因するスジ状の流れ模様がなく、均一で美麗な切断面であった。また、この丸棒を、実施例1と同様にして切削加工したところ、割れを発生することなく、直径25.4mm(1インチ)のボールを35個作製することができた。
Claims (17)
- 温度270℃及び剪断速度120sec-1で測定した溶融粘度が200~2,000Pa・sのポリグリコール酸を含有する樹脂材料から形成され、100mmを超え500mm以下の厚みまたは直径を有するポリグリコール酸固化押出成形物。
- 丸棒または平板の形状を有する請求項1記載のポリグリコール酸固化押出成形物。
- 前記樹脂材料が、全量基準で0.001~5質量%の着色剤を含有するポリグリコール酸組成物である請求項1または2記載のポリグリコール酸固化押出成形物。
- 前記樹脂材料が、全量基準で5~70質量%の充填剤を含有するポリグリコール酸組成物である請求項1乃至3のいずれか1項に記載のポリグリコール酸固化押出成形物。
- 機械加工用素材である請求項1乃至4のいずれか1項に記載のポリグリコール酸固化押出成形物。
- 請求項5記載のポリグリコール酸固化押出成形物を切削加工して形成したダウンホールツールまたはその部材。
- 請求項5記載のポリグリコール酸固化押出成形物を切削加工して形成した石油掘削用プラグ。
- 請求項5記載のポリグリコール酸固化押出成形物を切削加工して形成した石油掘削用プラグの芯材。
- 請求項5記載のポリグリコール酸固化押出成形物を切削加工して形成した直径20~200mmの石油掘削用ボールシーラー。
- 下記工程1乃至4;
a)温度270℃及び剪断速度120sec-1で測定した溶融粘度が200~2,000Pa・sのポリグリコール酸を含有する樹脂材料を、押出機に供給し、該押出機のシリンダー温度240~285℃で溶融混練する工程1;
b)該押出機先端の押出ダイから、溶融混練によって溶融した樹脂材料を、該押出ダイの溶融樹脂通路と連通しかつ押出成形物の断面形状を有する流路と、冷却手段とを備えたフォーミングダイの流路内に押出する工程2;
c)該フォーミングダイの流路内で樹脂材料からなる溶融押出物を冷却して固化させ、次いで、該フォーミングダイの先端から固化押出物を外部に押出する工程3;並びに
d)該固化押出物を加圧して、該フォーミングダイ方向に背圧をかけながら引き取り、その際、加圧によって該固化押出物の厚み方向または直径方向への膨張を抑制して、厚みまたは直径が100mmを超え500mm以下のポリグリコール酸固化押出成形物を得る工程4;
を含むポリグリコール酸固化押出成形物の製造方法。 - 前記工程3において、冷却手段に加えて加熱手段を配置したフォーミングダイを使用し、先ず、加熱手段によって、押出ダイ出口付近の流路内にある溶融押出物を230~290℃の温度に加熱し、次いで、冷却手段によって、流路内の溶融押出物を該ポリグリコール酸の結晶化温度未満の温度に冷却して固化させる請求項10記載の製造方法。
- 前記工程4で得られたポリグリコール酸固化押出成形物を、150~230℃の温度で3~24時間熱処理する工程5をさらに含む請求項10または11記載の製造方法。
- 前記樹脂材料が、全量基準で0.001~5質量%の着色剤を含有するポリグリコール酸組成物である請求項10乃至12のいずれか1項に記載の製造方法。
- 前記樹脂材料が、全量基準で5~70質量%の充填剤を含有するポリグリコール酸組成物である請求項10乃至13のいずれか1項に記載の製造方法。
- 前記工程4において、丸棒または平板の形状を有するポリグリコール酸固化押出成形物を得る請求項10乃至14のいずれか1項に記載の製造方法。
- 請求項10乃至15のいずれか1項に記載の製造方法により製造されたポリグリコール酸固化押出成形物を切削加工する工程6を含む、ダウンホールツールまたはその部材を製造する方法。
- 請求項10乃至15のいずれか1項に記載の製造方法により製造されたポリグリコール酸固化押出成形物を切削加工する工程6を含む、直径20~200mmの石油掘削用ボールシーラーを製造する方法。
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Also Published As
Publication number | Publication date |
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US20150252646A1 (en) | 2015-09-10 |
US20180291702A1 (en) | 2018-10-11 |
US10030465B2 (en) | 2018-07-24 |
JPWO2014077302A1 (ja) | 2017-01-05 |
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