WO2003061939A1 - Procede de production d'articles moules a base de resine thermoplastique regeneree - Google Patents
Procede de production d'articles moules a base de resine thermoplastique regeneree Download PDFInfo
- Publication number
- WO2003061939A1 WO2003061939A1 PCT/JP2003/000619 JP0300619W WO03061939A1 WO 2003061939 A1 WO2003061939 A1 WO 2003061939A1 JP 0300619 W JP0300619 W JP 0300619W WO 03061939 A1 WO03061939 A1 WO 03061939A1
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- WO
- WIPO (PCT)
- Prior art keywords
- thermoplastic resin
- resin
- molding
- recycled
- molded article
- Prior art date
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Classifications
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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
- B29C44/34—Auxiliary operations
- B29C44/3411—Relieving stresses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
- B29B17/0042—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting for shaping parts, e.g. multilayered parts with at least one layer containing regenerated plastic
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Definitions
- the present invention relates to a method for producing a thermoplastic resin molded article from waste thermoplastic resin molded article again.
- thermoplastic resin molded article is achieved by crushing the waste of the molded article and using the crushed material as a molding material as it is, or by melting and extruding the crushed material to form a pellet.
- a molding material for example, see International Publication No. 97Z38838 pamphlet (WO97 / 338838)).
- thermoplastic resin is degraded by heat applied during recycling, pelletization or molding, and the physical properties such as impact resistance of the resulting recycled molded product are reduced.
- thermoplastic resins containing a diene rubber such as acrylonitrile butadiene-styrene resin (ABS), high-impact polystyrene (HIPS), ABS and / or HIPS-modified polyphenylene ether (modified PPE), etc.
- ABS acrylonitrile butadiene-styrene resin
- HIPS high-impact polystyrene
- ABS high-impact polystyrene
- modified PPE modified polyphenylene ether
- the polymer chains are severed by the electron repulsion force, and the physical properties are significantly reduced. Therefore, it has recently been proposed to add a recycle improving agent at the time of recycling as a means to prevent the deterioration of physical properties at the time of recycling.
- a recycle improving agent at the time of recycling as a means to prevent the deterioration of physical properties at the time of recycling.
- a rubber-like substance which is compatible with the thermoplastic resin is mainly used (for example, WO 00/533384 pamphlet (WO 00/53338)). See).
- thermoplastics are degraded by the heat history exerted by recycling, The melt flow characteristics of the recycled thermoplastic resin change.
- the change in the melt flow property occurs even when the regenerated thermoplastic resin is added to a new thermoplastic resin in an amount of 1% by mass or more, particularly 5% by mass or more. Further, even if a recycle improving agent is added to prevent the deterioration of the physical properties, the melt flow property of the thermoplastic resin is changed.
- Such a change in the melt flow characteristics causes deterioration of the throwing power of the melt molding material to the mold during injection molding, causing defects such as sinks, distortions, and warpages in the molded product, and changes in the molding shrinkage.
- the dagger causes a difference in the finished dimensions of the product.
- thermoplastic resin changes its melt flow characteristics every time it is recycled.Therefore, it is necessary to set new injection molding conditions such as injection molding pressure and injection temperature and change the mold design every time recycling is carried out. Come out. Disclosure of the invention
- the present invention provides a gas-assisted method that uses a recycled thermoplastic resin recovered from waste thermoplastic resin molded articles or a blend of 1% by mass or more of the recycled thermoplastic resin with a novel thermoplastic resin.
- Another object of the present invention is to provide a method for producing a recycled thermoplastic resin molded article which is injection molded by a foam injection molding method.
- waste products include used resin molded products collected from the market, burrs generated during molding, thermoplastic resin accumulated in sprues and runners, cutting chips generated during trimming, and molding waste. It refers to defective products, cutting chips and defective products generated during the assembly of resin products.
- Thermoplastic resins to which the present invention is usefully applied are styrene resins and olefin resins. Further, when the thermoplastic resin contains a gen-based rubber and a Z- or olefin-based rubber and / or an acryl-based rubber, the present invention is more effectively applied.
- 1 to 5% by mass of a rubber-like substance compatible with the thermoplastic resin is added to the recycled thermoplastic resin or the compound as a recycling improver. It is desirable to do.
- the rubbery substance compatible with the styrene-based appearance includes a gen-based rubber and a Z- or olefin-based rubber and / or an acryl-based rubber. It is desirable that the graft polymer be a graft chain having a polymer chain compatible with the styrene resin.
- the rubbery substance compatible with the olefin-based resin is preferably an ethylene- ⁇ -branched olefin copolymer.
- thermoplastic resin molded article is coated with a paint and / or an ink using a thermoplastic resin or a thermosetting resin having compatibility with the thermoplastic resin as a vehicle.
- a sheet of a thermoplastic resin compatible with the thermoplastic resin is provided with an adhesive made of a thermoplastic resin or a thermosetting resin compatible with the thermoplastic resin.
- the thermoplastic resin molded article comprises a main part and an auxiliary part joined to the main part by an adhesive or a welding rod, and the adhesive is formed of the thermoplastic resin.
- the thermoplastic resin molded article is made of a paint film or ink. Membrane It can be milled and recycled without peeling off, peeling off sheets, or removing adhesives and welding rods.
- FIG. 1 is a perspective view of a molded article re-formed with a recycled resin material according to an embodiment of the present invention. Explanation of reference numerals
- thermoplastic resin molded product (Thermoplastic resin molded product)
- the thermoplastic resin molded article to be recycled in the present invention is generally a molded article in which a thermoplastic resin is used, and is, for example, an automobile, a transport machine, an OA device, and a housing of an electric appliance. Any molded article, such as a body, part, or stationery item.
- the thermoplastic resin of the thermoplastic resin molded product includes all thermoplastic resins generally used as molding materials.
- thermoplastic resins examples include polystyrene (PS), acrylonitrile'butadiene-styrene resin (ABS), acrylonitrile-acrylic rubber-styrene copolymer (AAS, ASA), acrylonitrile-ethylene rubber Styrene resins such as styrene copolymer (AES), high impact polystyrene (HIPS), acrylonitrile, styrene copolymer (AS), acrylonitrile-chlorinated polyethylene, styrene copolymer (ACS), and polyethylene (PE;), polypropylene (PP), ethylene-propylene copolymer, ethylene-vinyl acetate copolymer (EVA), polyolefin resin such as ionomer, polymethyl methacrylate (PMMA), methyl methacrylate / styrene copolymer Acrylic resin, polyvinyl chloride (PVA), polyvinylidene chloride
- thermoplastic elastomers such as styrene block copolymer (SEPS), thermoplastic polyurethane elastomers, olefinic elastomers, or P Polymer alloy of P and ethylene propylene rubber (EPM and Z or EP DM), Polymer alloy of ABS and PC, Polymer alloy of HIPS and PC, Poima of ABS and polybutylene terephthalate (PBT) Polymer alloys such as alloys are exemplified.
- thermoplastic resins include glass fiber, glass beads, bonbon fiber, ceramic fiber, metal fiber, my strength, talc, calcium carbonate, aluminum silicate, kaolin, silica, calcium metasilicate, bituminous powder, zeolite, Diatomaceous earth, Cay sand, Pumice powder, Slate powder, Alumina, Iron oxide, Aluminum sulfate, Barium sulfate, Lithobon, Calcium sulfate, Magnesium oxide, Molybdenum disulfide, Rubber powder, Ebonite powder, Shellac, Wood powder, Coconut coconut shell Powder, cork powder, cellulose powder, wood pulp, paper, cloth, mica powder, graphite, glass sphere (GB), volcanic glass hollow body, carbon hollow sphere, anthracite powder, artificial quartz stone, silicone shelf fine powder, Filler such as silica spherical fine particles, plasticizer, anti-aging agent, ultraviolet absorber, flame retardant Agents and the like may be added.
- Filler such as silica
- thermoplastic resins to which the present invention is usefully applied include styrene resins and olefin resins, which are generally widely used for molding.
- the thermoplastic resins to which the present invention is usefully applied include butadiene rubber.
- thermoplastic resins containing gen-based rubbers such as isoprene rubber and chloroprene rubber, and -olefin resins.
- Typical thermoplastic resins containing the above-mentioned gen-based rubber include ABS, HIPS, and modified PPE, and a typical ⁇ -olefin resin is polypropylene. Since the gen-based rubber contains unsaturated bonds, the unsaturated bonds are easily broken by heat or mechanical shearing force exerted during recycling.
- the ⁇ -olefin resin is liable to break the polymer chain by heat or mechanical shearing force exerted at the time of recycling due to the electron repulsion of the methyl group at the ⁇ -position.
- the resin or ⁇ -olefin resin is liable to deteriorate its physical properties and easily change its melt flow characteristics by recycling.
- the waste thermoplastic resin article is pulverized by a known method and used as it is as a molding material for molding the thermoplastic resin article again. It is made into a let and is made into a molding material.
- the recycled thermoplastic resin may be mixed with a new thermoplastic resin to form a molding material. In this case, the recycled thermoplastic resin is added to the new thermoplastic resin in an amount of 1% by mass or more, preferably 5% by mass or more in order to increase the recycling efficiency.
- the present invention is usefully applied because the melt flow properties change.
- the thermoplastic resin molded product is coated with a paint on its surface or printed with an ink.
- a thermoplastic resin or a thermosetting resin having compatibility with the resin of the molded article as a resin used as a vehicle for the paint or ink.
- “having compatibility” includes not only a state in which the resins are molecularly mixed with each other but also a state in which one resin is dispersed in the other resin in a sea-island state and does not cause phase separation.
- Examples of the resin compatible with the styrene resin include styrene resin, PPE, modified PPE, and PC.
- Examples of the resin compatible with PPE or modified PPE include PPE, modified PPE, styrene resin, and PC.
- Examples of the resin compatible with the olefin resin include an olefin resin, a halogenated olefin resin, and the like.
- styrene is required for molded articles such as styrene resin, PPE, modified PPE, and PC. It is desirable to use a paint or ink that uses modified acryl resin as a vehicle.
- the styrene-modified acrylic resin is a copolymer composed of styrene and an acrylic ester.
- the acrylic ester include methyl acrylate, ethyl acrylate, n-propyl acrylate, iso-propyl acrylate, n
- examples include acrylates such as butyl acrylate, iso-butyl acrylate, t-butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, tetrahydrofurfuryl acrylate, and the like, and methyl methacrylate and ethyl methacrylate.
- n-propyl methacrylate iso-propyl methacrylate
- n- Methacrylates such as butyl methacrylate, iso-butyl methacrylate, 2-ethylhexyl methacrylate, stearyl methacrylate, and lauryl methacrylate are used.
- the styrene-modified acrylic resin is methyl vinyl ether, ethyl vinyl ether, n-propyl pinyl ether, n-butyl vinyl ether, is 0— to the extent that the compatibility with the molded article is not impaired.
- Pinyl ethers such as butyl vinyl ether, nitrile monomers such as acrylonitrile and methacrylonitrile, aliphatic vinyls such as biel acetate and vinyl propionate, vinyl chloride, vinylidene chloride, biel fluoride and fluorine Halogen-containing monomers such as vinylidene fluoride, olefins such as ethylene and propylene, dienes such as isoprene, chloroprene and butadiene, acrylic acid, methacrylic acid, itaconic acid, maleic acid, crotonic acid, atropic acid, and citraconic acid 0 !, etc.) 3-unsaturated carboxylic acid, 2-hydroxyethyl methacrylate, 2-hydro Hydroxyl-containing monomers such as shetyl acrylate, 2-hydroxypropyl methacrylate, 2-hydroxypropyl acrylate, and aryl alcohol; amides such as acrylamide, methacrylamide, and di
- a cellulose derivative is added, but it is desirable to use a non-yellowing type cellulose derivative which does not discolor due to heat of recycling.
- the non-yellowing type cellulose derivative include, for example, ethyl cellulose, cellulose acetate, benzyl cellulose, cellulose, 7-acetate butyrate and the like.
- the above styrene-modified acryl resin has excellent solubility in solvents, and the solution has low viscosity and excellent coating workability without stringing, and exhibits excellent adhesiveness to vigor molded products. And has compatibility with styrene resins.
- a paint or ink using a halogenated olefin resin such as chlorinated polypropylene as a vehicle.
- the halogenated olefin-based resin exhibits excellent solubility in a solvent, exhibits excellent adhesion to a molded product, and has compatibility with the olefin-based resin.
- thermosetting resin examples include urea resin, melamine resin, urea-melamine cocondensation resin, benzoguanamine resin, phenol resin, resorcinol resin, epoxy resin, thermosetting urethane resin, and thermosetting resin.
- Acrylic resin and melamine-alkyd resin examples include urea resin, melamine resin, urea-melamine cocondensation resin, benzoguanamine resin, phenol resin, resorcinol resin, epoxy resin, thermosetting urethane resin, and thermosetting resin.
- Acrylic resin and melamine-alkyd resin examples include urea resin, melamine resin, urea-melamine cocondensation resin, benzoguanamine resin, phenol resin, resorcinol resin, epoxy resin, thermosetting urethane resin, and thermosetting resin.
- the waste of the molded article painted or printed with such a paint or ink can be recycled by pulverizing as it is without peeling off the resin.
- the resin is compatible with the resin of the molded article in a molten state without being separated, and thus does not deteriorate the physical properties of the recycled molded article.
- the coating film is not separated and removed and is pulverized together with the waste of the molded article and dispersed as a filler in the recycled molded article. Does not degrade the physical properties of the product.
- thermoplastic resin sheet When a thermoplastic resin sheet is adhered to a molded product with an adhesive as a label or seal, or a composite molding consisting of a main part and an auxiliary part joined to the main part with an adhesive or a welding rod There is a goods.
- the attachment include a frame, a leg, a boss, a label (decal), and the like, which are joined to the main part.
- the main part, the attached part, the adhesive, or the welding rod is made of a mutually compatible thermoplastic resin, and a thermosetting resin can be used as the adhesive. is there.
- examples of the resin compatible with the styrene resin include styrene resin, PPE, modified PPE, PC, and styrene-modified acrylic resin. ? Is £ ⁇ ⁇ ⁇ denatured? ? Examples of resins compatible with £ include PPE, modified PPE, styrene-based resin, PC, styrene-modified acrylic resin, etc.
- examples of resins compatible with olefin-based resin include olefin-based resin and halogenated olefin-based resin. It is a resin or the like.
- styrene resin,? ? £, denaturing? ? Styrene-modified acryl resin is desirable as the adhesive or welding rod for molded products such as £ and PC.
- the styrene-modified acrylic resin is similar to the styrene-modified acrylic resin used as a vehicle for the paint or ink. When used as an adhesive, it has excellent solubility in solvents, and its solution has a low viscosity. With no stringing, it has excellent coating workability, and when used as a welding rod, it is easily melted and has excellent welding workability, and has excellent adhesion to molded products.
- the composite molded product composed of the main part, the attached part, the adhesive or the thermoplastic resin of the welding rod having mutual compatibility can be pulverized and recycled without decomposition and separation.
- the composite molded article is desirably painted or printed with a paint or an ink using the above-mentioned compatible resin as a vehicle.
- Such composite molded products can be ground and recycled without decomposing and separating the MM without peeling off the MM.
- a thermosetting resin is used as an adhesive, it is dispersed in a recycled molded product as a filler by pulverization in the same manner as in the case of a paint pink.
- thermoplastic resin of the sheet and the adhesive is selected from those which are compatible with the thermoplastic resin of the molded article, or the adhesive is used.
- the agent one made of a thermosetting resin is selected.
- the waste of the above thermoplastic resin molded products is ground as described above for recycling. It is.
- the crushed waste is directly subjected to injection molding force or the crushed material is melted by an extruder, extruded into a string, cut by a rotary shaft, and injection molded as pellets.
- the recycled resin which is the above-mentioned waste product, may be mixed with a novel thermoplastic resin and injection-molded. In this case, the mixing ratio is 1% by mass or more, preferably 5% by mass or more based on the novel resin as described above.
- the new resin powder is mixed with the recycled resin, which is a crushed waste product, and the mixture is injection-molded as it is, or the mixture is pelletized as described above and injection-molded.
- a recycling improver may be added in order to improve the physical properties of the manufactured remanufactured product.
- the recycle improving agent will be described below.
- the rubbery substance used as a recycle improver for styrene-based resin, PPE, modified PPE, and PC has a trunk portion of a gen-based rubber, an olefin-based rubber, or an acrylic rubber. It is a graft rubber having a graft chain compatible with PC.
- an olefin-based rubber graft polymer and an acryl-based rubber graft polymer having excellent thermal stability are particularly preferred.
- the olefin rubber used in the recycle improving agent of the present invention may be a polymer of one or more of Q! -Olefins, or another monomer copolymerizable with one or more of the one-year-old olefins. It is a copolymer with one or more kinds, especially a copolymer of ethylene and one or more kinds of other ⁇ -olefins, or other monomers copolymerizable with them, especially non-conjugated It is a copolymer with a compound.
- Is propylene, .1-butene-1, 4-methylpentene-1, hexene-1, octene There is one magnitude.
- non-conjugated diene compound examples include dicyclopentadiene, tricyclopentadiene, 5-methyl-2,5-norpolnadiene, 5-methylene-12-norpolpolene, 5-vinyl-2-norbornene, 5-ethylidene-2-norbornene, —Isopropylidene— 2-Norpolene, 5-Isopropenyl-2-norbornene, 5- (1-butenyl) —2-Norpolene, 5- (2-Propenyl) 1-2-Norpolene, 5- (5- Xenyl) mono-2-norbornene, 4,7,8,9-tetrahydroindene, and isopropylidenetetrahydro-indene, cyclooctagene, vinylcyclohexene, 1,5,9-cyclododecatluene, 6-methyl-4, 7,8,9-tetrahydroindene, 2,2-dicyclopen
- non-conjugated diene compounds preferred are 5-ethylidene-2-norpolene (ENB), Z or dicyclopentene (DCP), and more preferably as a rubber which is a main component in a olefin rubber graft polymer.
- EPDM can increase the impact strength of thermoplastic resin for molding compared to EPM.
- olefin rubbers include ethylene 'propylene copolymer rubber (EPM), ethylene' propylene 'non-conjugated gen compound terpolymer rubber (EPDM), ethylene' butene copolymer rubber (EBM), ethylene 'Butene' non-conjugated gen compound A terpolymer rubber (EBDM).
- EPM ethylene 'propylene copolymer rubber
- EPDM ethylene' propylene 'non-conjugated gen compound terpolymer rubber
- EBM ethylene' butene copolymer rubber
- EBDM ethylene 'Butene' non-conjugated gen compound A terpolymer rubber
- the non-conjugated diene compound used in the EB DM is the same as in the case of the EP DM described above.
- the above-mentioned olefin-based rubber is for imparting compatibility to the target styrene-based resin.
- styrene-based resin mixed with acrylonitrile such as ABS, AAS, ASA, AES, AS, ACS, etc.
- styrene-based monomer and nitrile-based monomer Is graft-polymerized.
- styrene monomer to be graft-polymerized to the above-mentioned olefin rubber examples include styrene, ⁇ -alkylmonovinylidene aromatic monomers (eg, ⁇ -methylstyrene, ⁇ -ethylstyrene, ⁇ -methylvinyltoluene, ⁇ -methyldialkyl Styrene, etc.), ring-substituted alkylstyrene (eg, o, m, or p-vinyltoluene, o-ethylstyrene, p-ethylstyrene, 2,4-dimethylstyrene, p-tertiary butylstyrene, etc.), ring-substituted halostyrene ( For example, o-chlorostyrene, p-chlorostyrene, o-bromostyren
- Alkyl substituents also generally have from 1 to 4 carbon atoms and include both straight chain and branched alkyl groups.
- nitrile-based monomer to be graft-polymerized to the above-mentioned olefin rubber together with the styrene-based monomer include acrylonitrile, methacrylonitrile, ethacrylonitrile, fumaronitrile, and mixtures thereof.
- the acrylic rubber used in the present invention is a homopolymer of an acrylate having preferably an alkyl group having 2 to 8 carbon atoms, such as ethyl acrylate, n-butyl acrylate and 2-ethylhexyl acrylate.
- Other units such as ethylene, propylene Copolymers with one or more monomers, and functional monomers such as acrylic acid, methacrylic acid, ⁇ -hydroxyethyl methacrylate, acrylamide, and dimethylaminoethyl methacrylate; 1-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, ⁇ -trimethoxysilylstyrene, ⁇ -triethoxysilylstyrene, ⁇ -trimethoxysilyl- ⁇ -methylstyrene, ⁇ -triethoxysilyl- ⁇ -methylstyrene A copolymer with a polymerizable
- Examples of general-purpose acryl-based rubbers include, for example, polyethyl acrylate, poly ⁇ -butyl acrylate, ⁇ -butyl acrylate-acrylonitrile copolymer, and ⁇ - Butyl acrylate butadiene copolymer, ⁇ -butyl acrylate-ethylene copolymer, ⁇ -butyl acrylate-methacryloxypropyltrimethoxysilane copolymer, ⁇ -butyl acrylate-vinyl trimethoxysilane copolymer
- a preferable acrylic rubber which is a polymer or the like, there is an ⁇ -butyl acrylate / butadiene copolymer having a molar ratio of ⁇ -butyl acrylate / butadiene of 30/70 or more.
- the acryl-based rubber is obtained by graft-polymerizing a styrene-based monomer or a styrene-based monomer and a nitrile-based monomer in the same manner as the above-mentioned olefin-based rubber, and the styrene-based resin, the ⁇ - ⁇ -based resin, Compatibility of the PC resin with the thermoplastic resin is imparted.
- the above-mentioned recycle improving agent is mixed with the above-mentioned crushed waste material and injection-molded as it is, or is mixed with the above-mentioned crushed waste product and pelletized and injection-molded as described above. , Usually for waste mills or reclaimed resin: About 10% by mass.
- fillers At the time of recycling, fillers, plasticizers, anti-aging agents, ultraviolet absorbers, flame retardants, etc. may be supplemented and added. (Molding)
- an injection molding method is applied to the production of a regenerated molded product.
- the molding material in the mold cavity is melted.
- a substantially uniform pressure is applied to the object separately from the injection pressure.
- Such an injection molding method includes a gas assist method and a foam injection molding method.
- the foam injection molding method includes a chemical foaming method and a mechanical foaming method.
- an injection molding is performed by adding an inorganic or Z or organic foaming agent to the thermoplastic resin.
- the above foaming agent include inorganic ones such as water, dry ice, carbonates or acidic carbonates such as sodium hydrogencarbonate, sodium carbonate and potassium hydrogencarbonate, lithium boron hydrate, sodium borohydride and the like. Hydrogen compounds, nitrites such as ammonium nitrite and sodium nitrite, and combinations of metals such as magnesium, aluminum and zinc with acids or alkalis.
- organic compounds include dinyrosomethylene triamine and 2,2 ′ -Azobisisobutyronitrile, hydrodicarbonamide, ⁇ , ⁇ '-dimethyl N, ⁇ '-dinitrosoterephthalamide, azodicarbonamide, barium azodicarboxylate, paratoluenesulfonyl hydrazide, 2,4_toluene Sulfonyl hydrazide, ⁇ -methyl perylenebenzene Nilhydrazide, oxalylhydrazide, ⁇ , ⁇ '— oxybis (benzenesulfonylhydrazide), ⁇ , ⁇ ' — oxybis (benzenesulfonyl semicalilevazide), ⁇ -toluenesulfonyl azide, ⁇ -toluenesulfonyl semicarbazide, acetone-one —Toluenesulfonyl
- hydrocarbons such as gasoline, halogenated hydrocarbons such as dichloroethane and methylene chloride, alcohols such as methanol, ethanol, and isopropanol; ethyl ether; methylethyl Examples thereof include low-boiling solvents such as ether, and foamable force capsules in which the low-boiling solvent is sealed in a thermoplastic resin shell.
- a gas such as air, nitrogen gas, water vapor, or carbon dioxide gas is mixed with a melt of a molding material.
- the mixing of the gas is carried out by injecting the gas into the melting region of the molding material in the heating cylinder of the injection molding machine and kneading with a screw or at the nozzle at the tip of the heating cylinder.
- the gas particularly carbon dioxide
- the gas can be brought into a supercritical state.
- carbon dioxide gas which has been brought into a supercritical state in advance may be sent into the heating cylinder.
- the supercritical gas is easy to mix and dissolve in a large amount and uniformly in the molding material melt, and the supercritical gas becomes a solvent to improve the flowability of the molding material melt and improve the injection moldability. Improve.
- a molding material melt is injected and filled into a mold cavity while being foamed by the above-mentioned chemical foaming or mechanical foaming in a heating cylinder or a nozzle portion of an injection molding machine.
- the preferred method is to use a gas such as an inert gas such as nitrogen gas or carbon dioxide gas if the molding material in the hermetic structure has air in advance or gas burning may occur in the molding material due to contact with air.
- the above-mentioned molding material melt is injected and filled in a foamed state, and the gas is released into the atmosphere during or after the injection, or during or after the holding, to form a foamed structure.
- GCP method gas counter pressure method
- the Ex-ce11-O method of injecting a molding material melt into a mold cavity from a plurality of nozzles in a foamed state the mold cavity can be expanded, and the molding material can be expanded.
- the molding material in the mold is subjected to a foaming pressure such as a decomposition gas pressure of a chemical foaming agent, a vapor pressure of a low boiling point solvent, a gas pressure of a carbon dioxide gas or the like in a molten state, and the inside of the mold.
- a foaming pressure such as a decomposition gas pressure of a chemical foaming agent, a vapor pressure of a low boiling point solvent, a gas pressure of a carbon dioxide gas or the like in a molten state
- the shrinkage during cooling of the molded product is suppressed by the foam cells formed inside the molded product, and defects such as sink marks, distortion, and warpage are prevented.
- the molded article obtained has a skin layer on the outer surface in contact with the inner surface of the cavity, and a foam structure on the inner surface.
- the gas assist method is a method in which a molding material melt is injected into a mold cavity and a gas (gas) such as nitrogen or air is introduced into the cavity in a compressed high pressure state. Performs shaping, holding pressure and cooling by gas.
- the gas assist method includes the following two methods depending on the injection method and amount of the molding material melt and gas.
- One method is to introduce the gas outside the injection molding material melt, where the amount of the injection molding material melt is less than the space of the mold cavity (short shot), and delay the melt with the gas. It is suitable for molding rods, thick parts, and hollow parts.
- One method is to inject the same amount of molding material melt into the mold as the cavity space (full shot). ), By introducing the gas into the melt and maintaining the pressure with the gas, an amount of gas equivalent to the volume shrinkage accompanying the cooling and solidification of the molding material melt is injected to form a thin plate-shaped molded product. Suitable.
- AGI Asahi Kasei Kogyo Co., Ltd.'s Asi Gas Injection (AGI (trade name) method), Running (or RP Topra) Floating Core Mold (Molding) (RFM (trade name) method), Gas Press Injection (GPI (trade name) method), High Hollow Mold (Molding)
- AGI Asahi Kasei Kogyo Co., Ltd.'s Asi Gas Injection (AGI (trade name) method), Running (or RP Topra) Floating Core Mold (Molding) (RFM (trade name) method), Gas Press Injection (GPI (trade name) method), High Hollow Mold (Molding)
- H 2 M (trade name) method
- Shin press (trade name) method of Mitsubishi Gas (Gas) Chemical Co., Ltd., the United States of GAIN Technology, Germany Battenfeld, Inc. air one mold method of, Con tool (trade name) method
- Representative examples include Gas Injection Mold (GIM (trade name) method) of Idemitsu Petrochemical Co., Ltd., and Partial Frame Process (PFP (trade name) method) of Nippon Steel Tegiraku Co., Ltd. Any of them can be applied to the present invention.
- a method using a high-pressure liquid instead of a high-pressure gas for example, a hollow molding method (HELGA (trade name) method) using a readily vaporizable liquid from Tinger in the United States can be applied.
- a gas assist method with a foam injection molding method such as the above-mentioned GCP method or foam injection molding using carbon dioxide in a supercritical state.
- a needle pin As a means for injecting high-pressure gas directly into the cavity or into the runner, a needle pin is generally used, but a nozzle with a check pole can also be used to prevent gas backflow. It is also desirable that the tip angle of the needle pin be an angle smaller than 100 ° and be sharp, and that the needle pin has a double-cylinder structure, so that gas flows through a gap between the outer cylinder and the inner cylinder. It is desirable to have a supplied structure.
- the needle pin is easily heated by the molding material melt, and the solidified layer on the surface of the molding material melt tends to become thinner by sharpening the tip of the dolphin pin. The layer is easily broken and gas can be injected into the melt.
- the gas assist method by applying a gas pressure to the molding material melt in the cavity, defects such as sink marks, warpage, and distortion are prevented from occurring, and cooling shrinkage is also formed in the molded product. It is absorbed by the holes and prevents defects such as sink marks, warpage, and distortion.
- the gate position of the injection molding machine was one side gate, and the size was 3 x 10 mm.
- the shape of the molded article when the foamed injection molding (1) was a case of the solid forming substantially the same, 3 ⁇ 4J ⁇ t only 6111] 11 0
- AB S, HI PS, and modified PPE were each added with 0.2 parts by weight of ADCA (azodicarboxylic acid amide) as a foaming agent and 0.1 part by weight of sodium bicarbonate to form a foamable molding material. It was adjusted.
- ADCA azodicarboxylic acid amide
- Table 2 shows changes in the molding shrinkage when the molded article 1 made of ABS, HIPS, and modified PPE is formed by the solid molding, the gas assist method, and the foam injection molding described above. In the case of solid molding, it can be seen that the molding shrinkage constantly changes in any material.
- a coating with a styrene-modified acryl resin compatible with ABS, HIPS, and modified PPE as the main component was used.
- the coated molded product coated in the above was pulverized with the coating still applied, pelletized and re-formed, and then painted again and pulverized, and pelletizing and re-forming were repeated.
- the change in the molding shrinkage rate when molding the molded article 1 made of ABS, HIPS, and denatured PPE is determined. See Table 3. In the case of solid molding, it can be seen that the molding shrinkage constantly changes in any material.
- ABS has an olefin rubber graft polymer obtained by graft polymerization of nitrile monomer and styrene monomer to olefin rubber.
- an olefin rubber graft polymer obtained by graft polymerizing a styrene monomer to an olefin rubber
- Recycled Material added to each of the first, second and third turns, and reduced by recycling Molding was performed using a material whose physical properties were to be recovered.
- Table 4 shows the change in the molding shrinkage when the molded article 1 made of ABS, HIPS, and modified PPE is formed by the solid molding, the gas assist method, and the foam injection molding described above. In the case of solid molding, it can be seen that the molding shrinkage constantly changes in any material.
- ABS virgin pellets were mixed with the tumbler at the same time as the recycled material, and the mixture was molded using a mixed pellet with a recycled virgin material ratio of 50/50.
- Table 5 shows the molding shrinkage when the molded article 1 was molded by the solid molding, the gas assist method, and the foam injection molding described above.
- a SZ methyl ethyl ketone (MEK) adhesive dissolved in a mass ratio of 20X80 (A), adhesive similar to PS and MEK (B), adhesive composed of styrene-modified acrylic resin and MEK (C).
- the molded article 1 having one turn of recycling of the ABS and the molded article 1 having two turns of recycling were adhered using an adhesive (A) or an adhesive (C).
- the molded article of one turn of HIPS recycling was adhered to each other using the adhesive (B) and the adhesive (C).
- Each of the bonded molded products was crushed and pelletized with the adhesive attached, and molded using a recycled material containing the adhesive.
- Table 7 shows the molding shrinkage when the molded article 1 was molded by the solid molding, the gas assist method, and the foam injection molding described above.
- Polypropylene (PP) was molded by solid molding and a gas assist method under substantially the same molding conditions as those described above, and a molded product was obtained although slight sink marks J were recognized.
- the molded product 1 was repeatedly molded.
- the difference in the molding shrinkage in each case is shown in Table 8. It can be seen that the molding shrinkage always changes in the case of solid molding.
- Table 9 shows the difference in the molding shrinkage when the molded article 1 was repeatedly molded. In the case of solid molding, it can be seen that the molding shrinkage constantly changes.
- the fused product was pulverized, pelletized, and formed again by solid forming and the gas assist method.
- Table 10 shows the difference in the molding shrinkage at this time.
- the sprue runners and defective moldings generated during the molding process of ABS were pulverized, mixed with 20 parts by mass of virgin material, and re-molded by Zolid molding and gas assist method. Table 11 shows the molding shrinkage at this time.
- the molding shrinkage is constant regardless of the virgin material and the number of recycle turns. It turns out that it is not necessary to deal with the difference.
- the sheet material was printed with a printing ink using a styrene-modified acrylic resin compatible with a styrene-based resin such as an ABS resin as a vehicle to obtain a seal.
- a molded article made of ABS was manufactured. Using a styrene-modified acryl resin as a vehicle, the surface of the molded product is painted using a white paint using titanium oxide as a pigment, and the same as the ink used for printing the sheet material. Printed ink was used to print on the surface of the painted part.
- the seal was adhered to the surface of the molded article using an adhesive composed of the AnStg_AR, a styrene-modified acrylic resin, a ⁇ I plasticizer, and a solvent (ethyl acetate and toluene).
- the ABS molded product has a coating film, a printed film, and a seal, but the molded product does not separate and peel them, and has a coating film, a printed film, and a seal. It was ground and pelletized. Then, a recycled pellet was obtained from the molded product. Measurement of the I z od impact strength of the recycled pellets to virgin material that is 19. 7 k gZ cm 2, I zod impact strength of recycled Perret bracts was reduced with 16. 7 kgZ cm 2 .
- the evaluation includes a normal cross-cut test (primary adhesion) and a cross-cut test (second adhesion) performed after the coated molded article is immersed in warm water (40 ° C) for about 100 hours. 7)
- the surface was sanded with emery paper (# 380) and then swirled for the first time. Undercoating was applied to reduce the influence of the mark, and then a second coating was applied.
- the molded product obtained by solid molding is warped and deformed because the internal stress is relaxed by the solvent in the paint. did.
- the inner hollow layer and the foamed layer absorb the stress of the molded product, the residual stress is small, and the warping and deformation due to painting are small.
- ABS resin with a flammability grade of HB (Psycolak ZFJ5, manufactured by Ube Sikon Corporation) and grade V.
- One 5 V ABS resin (Psycolak ZFJ15, manufactured by Ube Sykon Co., Ltd.) is molded and processed to produce a molded material. The shape was crushed to obtain a crushed material.
- the molding shrinkage of the obtained molded article was measured by a flammability test method conforming to 94UL. The measurement results are shown in Table 14.
- the molding shrinkage of the obtained molded products (B-4, B-5, B-6) was measured by the test method described above. The measurement results are shown in Table 15.
- ABS resin (Stylac 1991) was molded to produce a molded material, and the obtained molded material was ground and pelletized. The pellets thus obtained were made into one-turn pellets for recycling (one-night pellets). Using the one-turn pellet, molding was performed to produce a molded material, and the obtained molded material was ground and pelletized. The pellets obtained in this manner were recycled into two-turn pellets (two-turn pellets). Thereafter, the same operation is repeated to obtain a 3-turn pellet and a 4-turn pellet. Was.
- the injection gas pressure during injection molding or the gas pressure generated during decomposition of the foaming agent allows the molding material melt to satisfactorily move around in the mold, and also suppresses shrinkage of the molding during cooling. It is possible to obtain a stable, high-product-value recycled resin product having stable dimensions without defects such as sink marks, warpage, and warpage.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03731827A EP1479502A4 (en) | 2002-01-23 | 2003-01-23 | PROCESS FOR PRODUCING MOLDED ARTICLES BASED ON REGENERATED THERMOPLASTIC RESIN |
JP2003561856A JPWO2003061939A1 (ja) | 2002-01-23 | 2003-01-23 | 再生熱可塑性樹脂成形品の製造方法 |
US10/502,116 US20050127579A1 (en) | 2002-01-23 | 2003-01-23 | Process for producing molded article of reclaimed thermoplastic resin |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002013765 | 2002-01-23 | ||
JP2002-013765 | 2002-01-23 | ||
JP2002-229903 | 2002-08-07 | ||
JP2002229903 | 2002-08-07 |
Publications (1)
Publication Number | Publication Date |
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WO2003061939A1 true WO2003061939A1 (fr) | 2003-07-31 |
Family
ID=27615682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/000619 WO2003061939A1 (fr) | 2002-01-23 | 2003-01-23 | Procede de production d'articles moules a base de resine thermoplastique regeneree |
Country Status (5)
Country | Link |
---|---|
US (1) | US20050127579A1 (ja) |
EP (1) | EP1479502A4 (ja) |
JP (1) | JPWO2003061939A1 (ja) |
CN (1) | CN1622873A (ja) |
WO (1) | WO2003061939A1 (ja) |
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JP2017013443A (ja) * | 2015-07-03 | 2017-01-19 | 株式会社日本製鋼所 | 中空成形品の成形方法 |
KR20220012287A (ko) * | 2019-05-21 | 2022-02-03 | 로버트 팔켄 | 생분해성이고 산업적으로 퇴비화 가능하고 재활용 가능한 사출 성형된 초미세 가요성 발포체 |
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JP2017013443A (ja) * | 2015-07-03 | 2017-01-19 | 株式会社日本製鋼所 | 中空成形品の成形方法 |
KR20220012287A (ko) * | 2019-05-21 | 2022-02-03 | 로버트 팔켄 | 생분해성이고 산업적으로 퇴비화 가능하고 재활용 가능한 사출 성형된 초미세 가요성 발포체 |
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Also Published As
Publication number | Publication date |
---|---|
US20050127579A1 (en) | 2005-06-16 |
JPWO2003061939A1 (ja) | 2005-05-19 |
EP1479502A1 (en) | 2004-11-24 |
EP1479502A4 (en) | 2007-03-21 |
CN1622873A (zh) | 2005-06-01 |
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