WO2021019873A1 - パージング剤およびそれを用いた成形機のパージング方法 - Google Patents
パージング剤およびそれを用いた成形機のパージング方法 Download PDFInfo
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- WO2021019873A1 WO2021019873A1 PCT/JP2020/019834 JP2020019834W WO2021019873A1 WO 2021019873 A1 WO2021019873 A1 WO 2021019873A1 JP 2020019834 W JP2020019834 W JP 2020019834W WO 2021019873 A1 WO2021019873 A1 WO 2021019873A1
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- resin
- mass
- resin composition
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- molding machine
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Classifications
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L31/04—Homopolymers or copolymers of vinyl acetate
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
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- C08L23/0861—Saponified vinylacetate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/26—Carbonates; Bicarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/26—Carbonates; Bicarbonates
- C08K2003/262—Alkali metal carbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
Definitions
- the present invention relates to a parsing agent and a parsing method of a molding machine using the parsing agent, and more particularly to a parsing agent having improved handleability and safety and a parsing method of a molding machine using the parsing agent.
- Resins with excellent gas barrier properties such as ethylene-vinyl alcohol copolymer (hereinafter sometimes referred to as EVOH) are often used in products such as films and containers for food packaging.
- EVOH ethylene-vinyl alcohol copolymer
- the resin may adhere to the flow path (for example, a screw) of the molding machine. If this adhered resin is left for a long period of time, the resin causes deterioration such as scorching, gelation, and decomposition, and the obtained product may have defects such as streaks, lumps, and gels, or a huge amount of defects may be eliminated. It will cause a lot of time and material loss.
- Patent Document 1 discloses a parsing agent containing a hydrophobic thermoplastic resin such as a polyolefin resin, a hydrophilic thermoplastic resin such as an ethylene-vinyl acetate copolymer saponified product, and water.
- Patent Document 2 discloses a parsing agent in which an ethylene-vinyl ester copolymer saponified product or the like and water are mixed in a predetermined ratio.
- Patent Document 3 discloses a parsing agent containing a polyolefin resin such as low density polyethylene (LDPE), a strong base compound such as a hydroxide of an alkali metal or an alkaline earth metal, and a salt that produces free water. doing.
- LDPE low density polyethylene
- Patent Document 1 and Patent Document 2 can sufficiently remove the resin adhering to the screw or the like of the molding machine (hereinafter, may be referred to as the resin to be purged), and purging. Improvement of ability is desired.
- the parsing agent described in Patent Document 3 the parsing ability is improved by the strong basic compound which is one of the components, but the parsing ability is not satisfactory.
- the present invention solves the above problems, and an object of the present invention is to provide a parsing agent capable of efficiently discharging a resin to be purged in a molding machine and a parsing method of a molding machine using the same.
- the above object [1] A resin composition containing a hydrophilic resin (A), water (B), and a basic compound (C), wherein the mass ratio (A) of the hydrophilic resin (A) and water (B). / (B) is 66/34 to 90/10, and the content of the basic compound (C) is 0.25 to 7 parts by mass with respect to 100 parts by mass of the hydrophilic resin (A).
- the basic compound (C) is an alkali metal carbonate, an alkali metal bicarbonate, an alkali metal phosphate, an alkali metal acetate, an alkali metal hydroxide, ammonia and a primary to tertiary amine.
- thermoplastic resin (D) The parsing agent according to [13], wherein the content of the other thermoplastic resin (D) is 1 to 10000 parts by mass with respect to 100 parts by mass of the hydrophilic resin (A);
- the basic compound (C) is an alkali metal carbonate, an alkali metal bicarbonate, an alkali metal phosphate, an alkali metal acetate, an alkali metal hydroxide, ammonia and a primary to tertiary amine.
- the mass ratio (A) / (B) of the hydrophilic resin (A) to the water (B) is 90/10 to 66/34, which includes a step of discharging the resin composition together with the resin to be purged.
- Perging method in which the content of the basic compound (C) is 0.25 to 7 parts by mass with respect to 100 parts by mass of the sex resin (A); [19] The parsing method of [18], wherein the hydrophilic resin (A), water (B), and the basic compound (C) are supplied to the molding machine in the form of the parsing agent of [11].
- Parsing method including discharging step; [25] Further, the parsing method of [24] including the step of supplying the hydrophilic resin (A) and the other thermoplastic resin (D) into the molding machine; [26] The parsing method of [24] or [25] in which the pH of the alkaline aqueous solution is 8 to 14; Is achieved by providing.
- the resin to be purged in the molding machine can be efficiently discharged from the molding machine. As a result, it is possible to reduce the product defects obtained from the molding machine and the time and material loss required to eliminate the defects.
- the resin composition of the present invention is a resin composition that can be used as a parsing agent, for example, for parsing a molding machine containing a resin to be purged, which will be described later.
- the resin composition of the present invention contains a hydrophilic resin (A), water (B), and a basic compound (C).
- the hydrophilic resin (A) includes a resin having an affinity for water, and examples thereof include a resin having a contact angle with water of 0 ° to 90 °.
- the hydrophilic resin (A) is preferably at least one selected from the group consisting of, for example, EVOH, polyvinyl alcohol, polyamide, polyacrylate, polyethylene glycol and polyacrylamide.
- EVOH is more preferable from the viewpoint of thermal stability and extrusion stability.
- the hydrophilic resin (A) melts to release an alkaline aqueous solution, and the resin to be purged adhering to the screw can be effectively decomposed and removed.
- EVOH is, for example, a copolymer obtained by saponifying an ethylene-vinyl ester copolymer.
- the production and saponification of the ethylene-vinyl ester copolymer can be carried out by a known method.
- the vinyl ester used in the method include fatty acid vinyl esters such as vinyl acetate, vinyl formate, vinyl propionate, vinyl pivalate, and vinyl versatic acid.
- the ethylene unit content of EVOH is, for example, preferably 15 mol% or more, more preferably 22 mol% or more, still more preferably 24 mol% or more.
- the ethylene unit content of EVOH is, for example, preferably 60 mol% or less, more preferably 55 mol% or less, still more preferably 50 mol% or less. If the ethylene unit content is less than 15 mol%, it may be difficult to extrude the obtained resin composition when the temperature in the melting region of the molding machine is 105 to 230 ° C. When the ethylene unit content is 60 mol% or less, the viscosity of the molten resin is lowered, and it tends to be difficult to remove the object to be purged.
- the ethylene unit content of EVOH can be measured, for example, by nuclear magnetic resonance (NMR) method.
- the degree of saponification of EVOH (that is, the degree of saponification of the vinyl ester component of EVOH) is, for example, preferably 99 mol% or more, more preferably 98% or more, still more preferably 95 mol% or more.
- the degree of saponification is 99 mol% or more, for example, it is possible to prevent the basic compound (C) from being consumed during the saponification reaction.
- the degree of saponification of EVOH is preferably, for example, 100% or less, and may be 99.99% or less.
- the saponification degree of the EVOH can be calculated by measuring the peak area of hydrogen atoms contained in the vinyl ester structure by the 1 H-NMR measurement, the peak area of hydrogen atoms contained in the vinyl alcohol structure.
- EVOH may also have units derived from ethylene and vinyl esters and other monomers other than saponified products thereof, as long as the object of the present invention is not impaired.
- the upper limit of the content of the other monomer units with respect to the total structural units of EVOH is, for example, preferably 30 mol% or less, more preferably 20 mol% or less, and 10 mol. % Or less is more preferable, and 5 mol% or less is most preferable.
- the content thereof is preferably, for example, 0.05 mol% or more, more preferably 0.1 mol% or more.
- alkens such as propylene, butylene, penten, hexene; 3-acyloxy-1-propene, 3-acyloxy-1-butene, 4-acyloxy-1-butene, 3,4-diasiloxy-.
- Butenes such as nitriles such as acrylamide and methacrylicamide; olefin sulfonic acids such as vinyl sulfonic acid, allyl sulfonic acid and methallyl sulfonic acid or salts thereof; vinyl trimethoxysilane, vinyl triethoxysilane, vinyl tri ( ⁇ -methoxy-ethoxy) )
- Vinyl silane compounds such as silane, ⁇ -methacryloxypropyl methoxysilane; alkyl vinyl ethers, vinyl ketone, N-vinylpyrrolidone, vinyl chloride, vinylidene chloride and the like can be mentioned.
- EVOH may be modified by urethanization, acetalization, cyanoethylation, oxyalkyleneization, or the like.
- the modified EVOH is used as a parsing agent, the compatibility with a perging resin made of, for example, a urethane-based, acetal-based, or achlorinitrile-based resin is improved, and parsing can be performed more efficiently.
- EVOH As the EVOH, two or more types of EVOH having different ethylene unit content, degree of saponification, copolymer component, presence / absence of modification, type of modification, etc. may be used in combination.
- EVOH can be obtained by a known method such as a mass polymerization method, a solution polymerization method, a suspension polymerization method, or an emulsion polymerization method.
- a massive polymerization method or a solution polymerization method is used in which polymerization can proceed in a solvent-free solution or in a solution such as alcohol.
- the solvent used in the solution polymerization method is not particularly limited, but is, for example, an alcohol, preferably a lower alcohol such as methanol, ethanol, or propanol.
- the amount of the solvent used in the polymerization reaction solution may be selected in consideration of the viscosity average degree of polymerization of the target EVOH and the chain transfer of the solvent, and the mass ratio of the solvent contained in the reaction solution to all the monomers (solvent). / Total monomer) is, for example, 0.01 to 10, preferably 0.05 to 3.
- Examples of the catalyst used for the above polymerization include 2,2-azobisisobutyronitrile, 2,2-azobis- (2,4-dimethylvaleronitrile), and 2,2-azobis- (4-methoxy-). 2,4-Dimethylvaleronitrile), 2,2-azobis- (2-cyclopropylpropionitrile) and other azo-based initiators; isobutyryl peroxide, cumylperoxyneodecanoate, diisopropylperoxycarbonate, di Examples thereof include organic peroxide-based initiators such as -n-propylperoxydicarbonate, t-butylperoxyneodecanoate, lauroyl peroxide, benzoyl peroxide, and t-butyl hydroperoxide.
- the polymerization temperature is preferably 20 ° C. to 90 ° C., more preferably 40 ° C. to 70 ° C.
- the polymerization time is preferably 2 hours to 15 hours, more preferably 3 hours to 11 hours.
- the polymerization rate is preferably 10% to 90%, more preferably 30% to 80% with respect to the charged vinyl ester.
- the resin content in the solution after polymerization is preferably 5% to 85%, more preferably 20% to 70%.
- a polymerization inhibitor is added as necessary to evaporate and remove unreacted ethylene gas to remove unreacted vinyl ester. Obtained at.
- an alkaline catalyst is added to the copolymer solution to saponify the copolymer.
- the method of saponification may be, for example, either a continuous method or a batch method.
- the alkali catalyst that can be added include sodium hydroxide, potassium hydroxide, alkali metal alcoholate and the like.
- EVOH after the saponification reaction contains an alkaline catalyst, by-products such as sodium acetate and potassium acetate, and other impurities, it is preferable to remove them by neutralization or washing as necessary.
- water containing almost no predetermined ions for example, metal ions and chloride ions
- by-products such as sodium acetate and potassium acetate are used. It may not be completely removed, but a part may remain.
- EVOH is other thermoplastic resin, metal salt other than basic compound (C), acid, boron compound, plasticizer, filler, anti-blocking agent, lubricant, stabilizer, surfactant, colorant, ultraviolet absorber, charge. It may contain an inhibitor, a desiccant, a cross-linking agent, a reinforcing material such as various fibers, and other components.
- an alkali metal salt is preferable from the viewpoint of improving thermal stability, and an alkaline earth metal salt is more preferable.
- the lower limit of the content thereof is, for example, 1 ppm or more, more preferably 5 ppm or more, further preferably 10 ppm or more, and 20 ppm or more in terms of metal atoms of the metal salt with respect to EVOH. Most preferred.
- the upper limit of the content thereof is, for example, 10000 ppm or less, more preferably 5000 ppm or less, further preferably 1000 ppm or less, and 500 ppm or less in terms of metal atoms of the metal salt with respect to EVOH. Most preferred.
- the content of the metal salt is in the above range, the thermal stability of EVOH during parsing becomes good.
- the acid is preferably a carboxylic acid compound, a phosphoric acid compound, or the like from the viewpoint of being able to enhance the thermal stability when melt-molding EVOH.
- the content of carboxylic acid (that is, the content of carboxylic acid in the resin composition containing EVOH) is preferably 1 ppm or more, more preferably 10 ppm or more, still more preferably 50 ppm or more. ..
- the content of the carboxylic acid compound is preferably 10,000 ppm or less, more preferably 1000 ppm or less, still more preferably 500 ppm or less.
- the phosphoric acid content (that is, the phosphoric acid root equivalent content of the phosphoric acid compound in the resin composition containing EVOH) is preferably 1 ppm or more, more preferably 10 ppm or more, and more preferably 30 ppm. The above is more preferable.
- the content of the phosphoric acid compound is preferably 10,000 ppm or less, more preferably 1000 ppm or less, still more preferably 300 ppm or less.
- EVOH contains the above-mentioned boron compound
- its content (that is, the boron-equivalent content of the boron compound in the resin composition containing EVOH) is preferably 1 ppm or more, more preferably 10 ppm or more, still more preferably 50 ppm or more. ..
- the content of the boron compound is preferably 2000 ppm or less, more preferably 1000 ppm or less, still more preferably 500 ppm or less.
- the thermal stability of EVOH during parsing tends to be good.
- the method of incorporating the carboxylic acid compound, the phosphoric acid compound, or the boron compound into the resin composition containing EVOH is not particularly limited, and for example, the composition containing EVOH may be added and kneaded when pelletizing. .. Further, a method of adding as a dry powder, a method of adding in the form of a paste impregnated with a predetermined solvent, a method of adding in a state of being suspended in a predetermined liquid, a method of dissolving in a predetermined solvent and adding as a solution. , A method of immersing in a predetermined solution and the like can also be mentioned.
- a method of dissolving them in a predetermined solvent and adding them as a solution and a method of immersing them in a predetermined solution are preferable.
- the predetermined solvent is not particularly limited, but water is preferable from the viewpoints of solubility, cost, ease of handling, safety of the working environment, and the like of the compound to be added.
- Polyvinyl alcohol is a resin obtained by saponifying a polymer of a vinyl ester-based monomer.
- the vinyl ester monomer include vinyl formate, vinyl acetate, vinyl propionate, vinyl valerate, vinyl caprate, vinyl laurate, vinyl stearate, vinyl 2,2,4,4-tetramethylvalerianate, and benzoic acid.
- examples include vinyl, vinyl pivalate, vinyl versatic acid and the like. Among them, vinyl acetate, vinyl propionate, vinyl pivalate, and vinyl versatic acid are preferably used alone or as a mixture.
- the degree of saponification of polyvinyl alcohol is not particularly limited, but 80 mol% or more is preferable, 90 mol% or more is more preferable, and 95 mol% or more is even more preferable.
- Polyamide is a polymer having an amide bond in its main chain.
- examples of polyamide include polycaproamide (nylon 6), poly- ⁇ -aminoheptanoic acid (nylon 7), poly- ⁇ -aminononanoic acid (nylon 9), polyundecaneamide (nylon 11), and polylauryl lactam (nylon).
- Polyethylenediamine adipamide (nylon 26), polytetramethylene adipamide (nylon 46), polyhexamethylene adipamide (nylon 66), polyhexamethylene sebacamide (nylon 610), polyhexamethylene dodeca Amide (nylon 612), polyoctamethylene adipamide (nylon 86), polydecamethylene adipamide (nylon 106), caprolactam / lauryllactam copolymer (nylon 6/12), caprolactam / ⁇ -aminononanoic acid copolymer Combined (nylon 6/9), caprolactam / hexamethylene diamethane adipate copolymer (nylon 6/66), lauryl lactam / hexamethylene diammonide adipate copolymer (nylon 12/66), ethylene diammonium adipate / hexamethylene Diammon adipate copolymer (nylon 26/66
- Polyamide can be obtained by melt polymerization, interfacial polymerization, solution polymerization, bulk polymerization, solid phase polymerization, or a combination of these.
- polyacrylate examples include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, pentyl acrylate, 2-ethylhexyl acrylate, decyl acrylate, dodecyl acrylate, stearyl acrylate, and ⁇ .
- -It can be produced by polymerizing an acrylate-based monomer such as chloroethyl acrylate, cyclohexyl acrylate, phenyl acrylate, methoxyethyl acrylate, ethoxyethyl acrylate, methoxypropyl acrylate, or ethoxypropyl acrylate, and then hydrolyzing it. It can also be obtained by polymerizing and hydrolyzing acrylonitrile.
- an acrylate-based monomer such as chloroethyl acrylate, cyclohexyl acrylate, phenyl acrylate, methoxyethyl acrylate, ethoxyethyl acrylate, methoxypropyl acrylate, or ethoxypropyl acrylate
- salts constituting the polyacrylic acid salt include alkali metal salts such as sodium, potassium and lithium, alkaline earth metal salts such as calcium, magnesium and barium, and ammonium such as quaternary ammonium and quaternary alkyl ammonium. Salt is mentioned. In particular, sodium salts are the most common and preferred.
- Polyethylene glycol is produced by addition polymerization of ethylene oxide to a compound having two or more active hydrogens such as ethylene glycol and diethylene glycol.
- An alkali metal compound may be used as a catalyst in the addition of ethylene oxide.
- the alkali metal compound include hydroxides of alkali metals (for example, lithium, sodium and potassium, etc.), alkali metal alcoholates (for example, sodium methylate and potassium methylate), and the like. Of these, sodium hydroxide and potassium hydroxide are preferable from the viewpoint of reactivity.
- the alkali metal compound one type may be used, or two or more types may be used in combination.
- Polyacrylamide As the polyacrylamide, a homopolymer of acrylamide or a copolymer of acrylamide and another copolymerizable monomer having an amide bond is used.
- the method for producing polyacrylamide is not particularly limited, and (i) a method of polymerizing acrylamides in methanol using 2,2'-azobisisobutyronitrile as an initiator, and (ii) a method of polymerizing acrylamides in ethanol. It is produced by a method of irradiating with light, (iii) a method of redox-polymerizing acrylamides in an aqueous solution, (vi) a method of irradiating solid acrylamides with ⁇ -rays, and the like.
- copolymerizable monomers with acrylamide include acrylic acid, methacrylic acid, styrene sulfonic acid, ethylene sulfonic acid, 2-acrylamide-2-methylpropane sulfonic acid, dimethylaminoethyl methacrylate, dimethylaminopropyl methacrylate, and dimethyl.
- C 1 to C 24 alkyl of acrylic acids such as aminoethyl acrylate, dimethylaminopropyl acrylate, diallyldimethylammonium chloride and quaternary salts thereof, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate and the like. Examples include esters.
- Water (B) Water (B) dissolves the basic compound (C) described later to prepare an aqueous solution having a desired pH, and the EVOH is widely diffused in the molding machine to discharge the resin to be purged existing in the molding machine. To urge.
- Examples of the water (B) constituting the resin composition of the present invention include pure water, ion-exchanged water, distilled water, tap water, and combinations thereof. Ion-exchanged water is preferred because it prevents unintentional salt contamination.
- the mass ratio (A) / (B) of the hydrophilic resin (A) to water (B) is 66/34 to 90/10, preferably 70/30 to 90/10. It is 10, more preferably 75/25 to 90/10, and even more preferably 80/20 to 88/12.
- mass ratio of the hydrophilic resin (A) and water (B) is within the above range, uneven distribution of water on the surface of the parsing agent composed of the resin composition of the present invention can be suppressed, so that the parsing agent is added. It is preferable in terms of safety because it can prevent adhesion to the hopper and prevent the aqueous solution containing the basic compound (C) from scattering from the purging agent.
- the hydrophilic resin (A) in the resin composition of the present invention has a high affinity for water and is appropriately bonded to water via hydrogen bonds, the water required for parsing in the molding machine is removed during parsing. It can be released and has sufficient viscosity to discharge the resin to be purged to the outside of the molding machine. In addition, unnecessary water does not remain in the molding machine during parsing, and feed defects can be reduced.
- water (B) is one of the important components for exerting the function of purging the resin to be purged.
- water (B) may be one of the optional components. That is, water (B) needs to be contained as a constituent component of the resin composition that passes through the molding machine when parsing the resin to be purged, but as a parsing agent before being supplied into the molding machine, It does not necessarily have to be contained in the parsing agent in advance.
- water (B) is supplied to the molding machine separately from the parsing agent when the parsing agent is supplied into the molding machine, and is mixed with the components constituting the parsing agent in the molding machine to form the resin composition of the present invention. It may constitute an object.
- water (B) may be contained in the form of a hydrophilic hydrophilic resin together with, for example, the hydrophilic resin (A).
- the method for preparing the water-containing hydrophilic resin is not particularly limited, but is a method of spraying water (B) on the hydrophilic resin (A), a method of immersing the hydrophilic resin (A) in water (B), and hydrophilicity.
- Examples thereof include a method in which the resin (A) is brought into contact with water vapor, which is a form of water (B), a method in which the hydrophilic resin (A) is extruded together with water (B), and the like.
- a method of autoclaving the hydrophilic resin (A) in the presence of water (B) the hydrophilic resin (A) is put into an extruder, and water is contained while adding water (B) on the way. Examples include a method of extrusion.
- the basic compound (C) becomes an aqueous solution by the water (B), and by setting the inside of the molding machine to alkaline conditions (preferably strong alkaline conditions), it plays a role of promoting the discharge of the resin to be purged existing in the molding machine.
- alkaline conditions preferably strong alkaline conditions
- Examples of the basic compound (C) include alkali metal carbonates, alkali metal bicarbonates, alkali metal phosphates, alkali metal acetates, alkali metal hydroxides, ammonia and primary to tertiary amines. And combinations thereof.
- examples of the basic compound (C) include alkali metal carbonate, alkali metal bicarbonate, and the like. Alkali metal phosphates, alkali metal acetates, alkali metal hydroxides, ammonia and primary to tertiary amines, and combinations thereof.
- the basic compound (C) may be, for example, an alkali metal carbonate or an alkali metal bicarbonate. , Alkali metal phosphates, and alkali metal acetates, ammonia and primary to tertiary amines, and combinations thereof.
- Examples of the alkali metal carbonate include sodium carbonate, potassium carbonate, lithium carbonate, and combinations thereof.
- Examples of the alkali metal bicarbonate include sodium hydrogen carbonate and potassium hydrogen carbonate, and combinations thereof.
- Examples of the alkali metal phosphate include trisodium phosphate, disodium hydrogen phosphate, monosodium dihydrogen phosphate, tripotassium phosphate, dipotassium hydrogen phosphate, monopotassium dihydrogen phosphate, and trilithium phosphate. Dipotassium hydrogen phosphate, monolithium dihydrogen phosphate, and combinations thereof can be mentioned.
- Examples of alkali metal acetates include sodium acetate, potassium acetate, and lithium acetate, and combinations thereof.
- Hydroxides of alkali metals include, for example, sodium hydroxide, potassium hydroxide, and lithium hydroxide, and combinations thereof.
- Sodium carbonate and potassium carbonate are preferable from the viewpoint of having sufficient purging ability and ensuring the operator safety of the purging agent.
- the content of the basic compound (C) is 0.25 parts by mass or more, preferably 0.3 parts by mass or more, and more preferably 0.4 parts by mass with respect to 100 parts by mass of the hydrophilic resin (A). That is all.
- the content of the basic compound (C) is 7 parts by mass or less, preferably 6 parts by mass or less, and more preferably 4 parts by mass or less with respect to 100 parts by mass of the hydrophilic resin (A).
- the content of the basic compound (C) is less than 0.25 parts by mass, the aqueous solution formed together with the water (B) approaches neutrality, and the discharge efficiency of the resin to be purged in the molding machine tends to decrease. .. If the content of the basic compound (C) exceeds 7 parts by mass, the alkaline aqueous solution is saturated and tends to cause salt precipitation when the parsing resin is stored.
- the pH of the alkaline aqueous solution and / or the resin composition of the present invention is preferably 8 to 14, more preferably. Is 10 to 13.
- the pH is less than 8, the discharge efficiency of the obtained resin composition with respect to the object to be purged in the molding machine tends to decrease.
- the resin composition of the present invention may contain other thermoplastic resin (D) in addition to the above hydrophilic resin (A), water (B), and basic compound (C).
- the thermoplastic resin (D) is composed of a thermoplastic resin other than the hydrophilic resin (A).
- thermoplastic resin (D) examples include EVOH resin, vinyl alcohol-based resin other than EVOH resin (PVA resin, etc.), PA resin, polyolefin resin (linear low-density polyethylene, low-density polyethylene, medium-density polyethylene, etc.).
- High-density polyethylene ethylene-vinyl acetate copolymer, ionomer, ethylene-propylene copolymer, ethylene-acrylic acid ester copolymer, polypropylene, propylene- ⁇ -olefin ( ⁇ -olefin having 4 to 20 carbon atoms) co-weight Combined, polybutene, polypentene, etc.), modified polyolefin resin obtained by graft-modifying unsaturated carboxylic acid to polyolefin resin, polyester resin, polyvinyl chloride resin, thermoplastic polyurethane resin, polyvinylidene chloride, acrylic resin, polystyrene Examples thereof include based resins, vinyl ester-based resins, polyester elastomers, polyurethane elastomers, chlorinated polyethylenes, chlorinated polypropylenes, aromatic or aliphatic polyketones, and combinations thereof.
- the content of the thermoplastic resin (D) is preferably 1 part by mass or more, more preferably 50 parts by mass or more, and further preferably 100 parts by mass or more with respect to 100 parts by mass of the hydrophilic resin (A).
- the content of the thermoplastic resin (D) is preferably 10,000 parts by mass or less with respect to 100 parts by mass of the hydrophilic resin (A).
- the upper limit of the content of the thermoplastic resin (D) may differ in a suitable range depending on the viscosity of the thermoplastic resin (D) used.
- the upper limit is preferably 990 parts by mass or less with respect to 100 parts by mass of the hydrophilic resin (A). , 800 parts by mass or less is more preferable, and 600 parts by mass or less is further preferable.
- the upper limit is 10,000 parts by mass or less with respect to 100 parts by mass of the hydrophilic resin (A). It is preferably 5000 parts by mass or less, more preferably 2000 parts by mass or less, and particularly preferably 1500 parts by mass or less.
- the upper limit value is in the above range, the effect of the present invention can be obtained more effectively, but the above range may differ depending on the molding machine used.
- the resin assembly of the present invention may contain other additives as long as the effects of the present invention are not impaired.
- Other additives include, for example, abrasives, fillers, heat stabilizers, processing aids, antiblocking agents, antistatic agents, coupling agents, antioxidants, lubricants, foaming agents, surfactants, and Examples include plasticizers and combinations thereof.
- the abrasive is used to discharge the resin to be purged in the molding machine through a physical polishing action, and examples thereof include those composed of inorganic compounds such as alumina, zirconia, silica, titanium dioxide, and calcium carbonate.
- the content of the other additives is not particularly limited, and the combination of the hydrophilic resin (A), water (B), and the basic compound (C) inhibits the efficiency of parsing.
- a person skilled in the art can appropriately set the value within the range not applicable.
- the purging agent of the present invention comprises the above resin composition, that is, a hydrophilic resin (A), water (B) and a basic compound (C), and if necessary, other optional components. It is composed of a resin composition containing the thermoplastic resin (D) of the above and other additives.
- first parsing agent the parsing agent composed of the above resin composition is referred to as "first parsing agent”.
- the purging agent of the present invention comprises the above resin composition containing no water (B), that is, a hydrophilic resin (A) and a basic compound (C). It is composed of a resin composition containing another thermoplastic resin (D) which is an optional component and other additives, if necessary.
- a parsing agent composed of the above resin composition excluding water (B) is referred to as a "second parsing agent".
- the types and contents of the hydrophilic resin (A), the basic compound (C), the other thermoplastic resin (D) and other additives in the second purging agent of the present invention are the above-mentioned first parsing agent.
- the same type and content as those contained in can be selected.
- the ethylene unit content and the degree of saponification of the hydrophilic resin (A) in the second purging agent of the present invention are also the same as those of the hydrophilic resin (A) contained in the first parsing agent. Can be set.
- the first parsing agent of the present invention is excellent in safety because it is not necessary for the operator to adjust the component content of the parsing agent when it is put into the molding machine.
- the second parsing agent of the present invention does not contain water (B) in advance, and can reduce the mass and volume of the entire parsing agent as compared with the first parsing agent. Can improve efficiency during transportation and storage.
- the first parsing agent can be directly put into a molding machine containing a resin to be purged, for example, through a hopper.
- the second purging agent of the present invention contains the resin to be perged in the obtained composition after preparing the resin composition of the present invention by adding a predetermined amount of the above water (B) before use. It can be used by throwing it into a molding machine through, for example, a hopper. Alternatively, the second purging agent of the present invention is put into a molding machine containing the resin to be purged without containing the water (B), for example, through a hopper, and is separately provided in the molding machine (for example,).
- the resin composition of the present invention can also be prepared and used by adding water (B) from an orifice provided through the cylinder) and kneading the mixture in the cylinder.
- the molding machine to which the first parsing agent and the second parsing agent of the present invention can be used refers to various general molding machines and molding machines through which the resin is distributed.
- the molding machine used in the present invention is not particularly limited, and for example, an extruder (including, for example, a single-screw extruder, a twin-screw extruder, etc.), an injection molding machine, a single-layer film molding machine, and a single-layer inflation molding machine. , Co-extrusion sheet molding machine, co-extrusion film molding machine, multi-layer blow molding machine, co-injection molding machine and the like, and piping, feed block, die and the like of each molding machine.
- parsing method for molding machines containing resin to be purged for example, the hydrophilic resin (A), water (B) and the basic compound (C) and other thermoplastic resins (D) which are optional components, if necessary, are placed in the molding machine. A resin composition containing and / or other additives is supplied and the resin composition is discharged together with the resin to be purged.
- the parsing method performed by using the resin composition in this way is referred to as a "first parsing method".
- the resin composition is supplied to the molding machine with, for example, the hydrophilic resin (A), water (B) and the basic compound (C), and optionally any components.
- the other thermoplastic resin (D) and other additives, respectively, may be made from the hopper and / or other part of the molding machine (eg, an orifice provided through the cylinder), but are preferred. Is supplied into the molding machine in the form of the first purging agent or the second purging agent of the present invention.
- the molding machine is an extruder.
- the first parsing agent of the present invention is directly charged through, for example, the hopper of the extruder and rotates the screw in the cylinder. By allowing the first parsing agent to be supplied into the cylinder.
- the second purging agent of the present invention is prepared after adding a predetermined amount of the water (B) before use.
- the obtained composition is put into an extruder, for example, through a hopper, and the screw in the cylinder is rotated to supply the resin composition containing the second purging agent into the cylinder.
- a basic compound (C) constituting the second purging agent other than the above-mentioned alkali metal hydroxide.
- the second parsing agent of the present invention is put into the extruder in a state where the water (B) is not contained, for example, through a hopper, and penetrates into a portion (for example, a cylinder) separately provided in the molding machine. Water (B) is added from the provided orifice), and the screw is rotated in the cylinder to knead the mixture.
- the purge temperature in the molding machine (that is, the temperature of the molten region of the molding machine) can be appropriately adjusted depending on the specifications of the molding machine used and the viscosity of the thermoplastic resin (D).
- the suitable range may differ depending on the viscosity of the thermoplastic resin (D) used.
- the temperature is preferably set to 105 ° C. to 170 ° C., more preferably 110 ° C. to 160 ° C.
- the temperature is less than 105 ° C., the resin composition in the molding machine may not be sufficiently melted, and it may be difficult to efficiently discharge the resin to be purged. If the temperature exceeds 170 ° C., the viscosity of the resin may decrease and the parsing efficiency may decrease.
- the temperature is preferably 150 ° C. to 230 ° C., more preferably 170 ° C. to 210 ° C., still more preferably. It is set to 180-200 ° C. If the temperature is less than 150 ° C., the melt viscosity of the resin composition in the molding machine is high, and it may be difficult to efficiently discharge the resin to be purged. If the temperature exceeds 230 ° C., the viscosity of the resin may decrease and the parsing efficiency may decrease significantly.
- the supply of the resin composition to the molding machine is, for example, the volume amount of the resin to be purged remaining in the molding machine (for example, when the molding machine is an extruder, it corresponds to the capacity obtained by subtracting the screw capacity from the cylinder capacity).
- an amount corresponding to preferably 1 time or more and 1000 times or less, more preferably 2 times or more and 100 times or less is supplied. If the amount of the resin composition to be supplied is less than 1 times the volume of the resin to be purged remaining in the molding machine, the resin to be purged may remain in the molding machine.
- an alkaline aqueous solution containing the water (B) and the basic compound (C) is supplied into the molding machine, and the alkaline aqueous solution is supplied together with the parsing resin. It may be discharged.
- the parsing method performed by using the alkaline aqueous solution in this way is referred to as a "second parsing method".
- the water (B) used in the second purging method of the present invention is the same as that used in the resin composition of the present invention.
- the basic compound (C) used in the second purging method of the present invention contains alkali metals such as lithium, sodium and potassium.
- alkali metals such as lithium, sodium and potassium.
- salts that can constitute the basic compound (C) include carbonates, bicarbonates, and phosphates.
- Examples of the basic compound (C) include sodium carbonate, potassium carbonate, lithium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, trisodium phosphate, disodium hydrogen phosphate, monosodium dihydrogen phosphate, and tripotassium phosphate.
- Examples thereof include dipotassium hydrogen phosphate, monopotassium dihydrogen phosphate, trilithium phosphate, dilithium hydrogen phosphate, monolithium dihydrogen phosphate, sodium acetate, potassium acetate, lithium acetate, and combinations thereof.
- Sodium carbonate and potassium carbonate are preferable from the viewpoint of ensuring the safety of workers.
- the pH of the alkaline aqueous solution supplied to the molding machine is preferably 8 to 14, more preferably 10 to 13.
- the efficiency of discharging the obtained alkaline aqueous solution to the resin to be molded in the molding machine tends to decrease.
- the method of supplying an alkaline aqueous solution into the molding machine is as follows: for example, the above water (B) and the basic compound (C) are mixed in advance to prepare an alkaline aqueous solution, and the obtained alkaline aqueous solution is prepared. Is supplied into the molding machine through a hopper and / or other part of the molding machine (for example, an orifice provided through the cylinder). However, an alkaline aqueous solution using a hydroxide as the basic compound (C) may cause undesired corrosion if it adheres to a metal portion such as a hopper.
- the alkaline aqueous solution utilizes its fluidity to come into contact with a metal part other than the inside of the molding machine through a tube made of a chemical resistant material (for example, silicone rubber, Teflon (registered trademark), etc.). It is preferably introduced into the cylinder with reduced opportunities.
- the water (B) and the basic compound (C) are separately introduced through the hopper and / or other portion of the molding machine (eg, an orifice provided through the cylinder) and alkaline in the molding machine. It may be supplied by preparing an aqueous solution. It is also preferable to supply the hydrophilic resin (A) and the other thermoplastic resin (D) together with the alkaline aqueous solution.
- the temperature inside the molding machine (that is, the temperature of the molten region of the molding machine) is preferably set to 105 ° C. to 230 ° C., more preferably 110 ° C. to 210 ° C. If this temperature is less than 105 ° C., it may be difficult to efficiently discharge the object to be purged. If the temperature exceeds 230 ° C., a part of the water content may be vaporized, and the alkaline aqueous solution may not act efficiently with the resin to be purged.
- an appropriate amount of water for example, pure water, for example, pure water, etc.
- water for example, pure water, for example, pure water, etc.
- Cleaning with ion-exchanged water, distilled water, and tap water, and combinations thereof) may be performed.
- the object to be purged is, for example, a thermoplastic resin or a mixture containing the thermoplastic resin.
- the thermoplastic resin constituting the perging resin include EVOH resin, vinyl alcohol-based resin (PVA resin, etc.) other than EVOH resin, PA resin, and polyolefin-based resin (linear low-density polyethylene, low-density polyethylene, medium).
- Examples of the resin to be purged for which the present invention is particularly desired include scrap recovered products.
- the scrap may be (1) an off-spec product or trim generated in the process of manufacturing the multilayer structure, or (2) a recovered packaging material consumed in the market.
- those listed as the above-mentioned resin to be purged may be used.
- scrap generated in the process of manufacturing a multilayer structure is often recovered, and the recovered product is melt-molded again by an extruder and recycled as at least one layer of a new multilayer structure. ..
- the resin composition constituting the multilayer structure may be severely deteriorated by receiving a heat history when melt-kneaded by an extruder.
- the resin composition constituting the multilayer structure contains a resin that reacts during melt-kneading, it may be severely deteriorated.
- the parsing agent of the present invention can also be effectively used for parsing a resin to be purged, which adheres more firmly to the flow path due to such severe deterioration.
- D1 Low density polyethylene (“LC-600A” manufactured by Japan Polyethylene Corporation, MFR 7g / 10 minutes)
- D2 Low-density polyethylene ("UJ790” manufactured by Japan Polyethylene Corporation, MFR 50 g / 10 minutes)
- D3 High-density polyethylene ("HB111R” manufactured by Japan Polyethylene Corporation, MFR 0.03 g / 10 minutes)
- a hydrous EVOH resin containing a portion was obtained. 264 parts by mass of low-density polyethylene (d1) was mixed with the obtained hydrous EVOH resin by dry blending to obtain a resin composition (E1). The pH of the obtained resin composition (E1) was measured using a pH meter (“HI-9812-5” manufactured by Hanna Instruments Japan Co., Ltd.). The results are shown in Table 1.
- Example 1 Purging of resin to be purged
- high-density polyethylene (“HI-ZEX 7000F” manufactured by Prime Polymer Co., Ltd.) was passed through the extruder for 5 minutes, and the die was removed. Then, the cylinder was heated to 290 ° C., and the resin to be purged was oxidatively deteriorated by heating at a screw rotation speed of 10 rpm for 3 hours while allowing air to flow in.
- the resin composition (E1) was supplied from the hopper of the extruder at a purge temperature of 110 ° C. at a screw rotation speed of 100 rpm and an extrusion rate of 3.2 (kg / hour) for 40 minutes, and then low-density polyethylene.
- LC-600A manufactured by Japan Polyethylene Corporation
- low-density polyethylene (“LC-600A” manufactured by Japan Polyethylene Corporation) is passed for 10 minutes while heating the cylinder until it reaches 220 ° C. It was.
- high-density polyethylene (“HI-ZEX 7000F” manufactured by Prime Polymer Co., Ltd.) was passed for 5 minutes.
- Examples 1 to 19 and 22 Purging of resin to be purged
- the resin compositions (E1) to (E19) shown in Table 2 were used, and the resin to be purged remaining in the extruder was purged in the same manner as in Example 1 except that the purge temperature shown in Table 2 was adopted. The results are shown in Table 2.
- Example 20 Parsing of resin to be purged by the second parsing method
- 100 parts by mass of EVOH (A6) and 264 parts by mass of low-density polyethylene (d1) are introduced from the hopper of the extruder, and carbon dioxide having a concentration of 10% by mass is introduced from the supply section of the extruder.
- carbon dioxide having a concentration of 10% by mass is introduced from the supply section of the extruder.
- a parsing agent was formed in the extruder, and the parsing resin remaining in the extruder was purged in the same manner as in Example 1. went.
- the results are shown in Table 2.
- Example 21 Parsing of resin to be purged by the second parsing method
- a hydrous EVOH resin containing 100 parts by mass of EVOH (A1) and 25 parts by mass of ion-exchanged water and 264 parts by mass of low-density polyethylene (d1) were introduced from the hopper of the extruder and concentrated.
- a parsing agent was formed in the extruder, and the resin to be purged remaining in the extruder was purged. Parsing was performed in the same manner. The results are shown in Table 2.
- the present invention it is useful in the field of resin molding, for example, in that it is possible to reduce product defects obtained through a molding machine and a huge amount of time and material loss required for eliminating the defects.
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Abstract
Description
[1]親水性樹脂(A)、水(B)、および塩基性化合物(C)を含有する樹脂組成物であって、親水性樹脂(A)と水(B)との質量比(A)/(B)が66/34~90/10であり、親水性樹脂(A)100質量部に対して、塩基性化合物(C)の含有量が0.25~7質量部である樹脂組成物;
[2]さらに他の熱可塑性樹脂(D)を含有する[1]に記載の樹脂組成物;
[3]親水性樹脂(A)100質量部に対して、他の熱可塑性樹脂(D)の含有量が1~10000質量部である[2]に記載の樹脂組成物;
[4]親水性樹脂(A)と水(B)とが一緒になって含水親水性樹脂の形態で含有されている[1]~[3]のいずれかの樹脂組成物;
[5]塩基性化合物(C)が、炭酸アルカリ金属塩、重炭酸アルカリ金属塩、リン酸アルカリ金属塩、酢酸アルカリ金属塩、アルカリ金属の水酸化物、アンモニアおよび第一級から第三級アミンからなる群から選ばれる少なくとも1種である[1]~[4]のいずれかの樹脂組成物;
[6]水(B)と塩基性化合物(C)が一緒になってアルカリ水溶液の形態で含有されている請求項[1]~[3]のいずれかの樹脂組成物;
[7]アルカリ水溶液のpHが8~14である[6]の樹脂組成物;
[8]塩基性化合物(C)が、炭酸アルカリ金属塩、重炭酸アルカリ金属塩、リン酸アルカリ金属塩、酢酸アルカリ金属塩、アンモニアおよび第一級から第三級アミンからなる群から選ばれる少なくとも1種である[6]または[7]の樹脂組成物;
[9]親水性樹脂(A)がエチレン-ビニルアルコール共重合体である[1]~[8]のいずれかの樹脂組成物;
[10]エチレン-ビニルアルコール共重合体のエチレン単位含有量が15~60モル%である[9]の樹脂組成物;
[11][1]~[10]のいずれかの樹脂組成物を含有するパージング剤;
[12]親水性樹脂(A)および塩基性化合物(C)を含有し、親水性樹脂(A)100質量部に対して、塩基性化合物(C)の含有量が0.25~7質量部であるパージング剤;
[13]さらに他の熱可塑性樹脂(D)を含有する[12]のパージング剤;
[14]親水性樹脂(A)100質量部に対して、他の熱可塑性樹脂(D)の含有量が1~10000質量部である[13]のパージング剤;
[15]塩基性化合物(C)が、炭酸アルカリ金属塩、重炭酸アルカリ金属塩、リン酸アルカリ金属塩、酢酸アルカリ金属塩、アルカリ金属の水酸化物、アンモニアおよび第一級から第三級アミンからなる群から選ばれる少なくとも1種である[12]~[14]のいずれかのパージング剤;
[16]親水性樹脂(A)がエチレン-ビニルアルコール共重合体である[12]~[15]のいずれかのパージング剤;
[17]エチレン-ビニルアルコール共重合体のエチレン単位含有量が15~60モル%である[16]のパージング剤;
[18]被パージング樹脂を含む成形機のパージング方法であって、成形機内に、親水性樹脂(A)、水(B)、および塩基性化合物(C)を含有する樹脂組成物を供給して、該樹脂組成物を被パージング樹脂とともに排出する工程を含み、親水性樹脂(A)と水(B)との質量比(A)/(B)が90/10~66/34であり、親水性樹脂(A)100質量部に対して、塩基性化合物(C)の含有量が0.25~7質量部であるパージング方法;
[19]成形機に対し、親水性樹脂(A)、水(B)、および塩基性化合物(C)が、[11]のパージング剤の形態で供給される[18]のパージング方法;
[20]成形機に対し、親水性樹脂(A)および塩基化合物(C)が、[12]~[17]のいずれかのパージング剤の形態で供給される[18]のパージング方法;
[21]成形機の溶融領域における温度が105~230℃である[18]~[20]のいずれかのパージング方法;
[22]親水性樹脂(A)がエチレン-ビニルアルコール共重合体である[18]~[21]のいずれかのパージング剤;
[23]エチレン-ビニルアルコール共重合体のエチレン単位含有量が15~60モル%である[22]のパージング剤;
[24]被パージング樹脂を含む成形機のパージング方法であって、成形機内に、水(B)および塩基性化合物(C)を含有するアルカリ水溶液を供給して、該アルカリ水溶液を被パージング樹脂とともに排出する工程を含むパージング方法;
[25]さらに、成形機内に親水性樹脂(A)および他の熱可塑性樹脂(D)を供給する工程を含む[24]のパージング方法;
[26]アルカリ水溶液のpHが8~14である[24]または[25]のパージング方法;
を提供することで達成される。
本発明の樹脂組成物は、例えば後述する被パージング樹脂を含む成形機のパージングのために、パージング剤として使用できる樹脂組成物である。
親水性樹脂(A)は、水に対して親和性を示す樹脂を包含し、例えば水に対する接触角が0°~90°である樹脂が挙げられる。このような親水性樹脂(A)としては、例えばEVOH、ポリビニルアルコール、ポリアミド、ポリアクリル酸塩、ポリエチレングリコールおよびポリアクリルアミドからなる群から選ばれる少なくとも1種であることが好ましい。特に、熱安定性および押出安定性の観点から、EVOHがより好ましい。親水性樹脂(A)を用いることで、本発明の樹脂組成物からなるパージング剤を常温で保管する際に、水(B)および塩基性化合物(C)を含有するアルカリ水溶液を該親水性樹脂(A)内に安定に保有することで、使用者の安全性を確保できる。また、パージングを行う際は親水性樹脂(A)が溶融することでアルカリ水溶液を放出し、効果的にスクリューに付着する被パージング樹脂を分解し除去できる。
EVOHは、例えばエチレン-ビニルエステル共重合体をケン化することで得られる共重合体である。エチレン-ビニルエステル共重合体の製造およびケン化は、公知の方法で行うことができる。当該方法に用いられるビニルエステルとしては、例えば酢酸ビニル、ギ酸ビニル、プロピオン酸ビニル、ピバリン酸ビニル、およびバーサティック酸ビニル等の脂肪酸ビニルエステルが挙げられる。
ポリビニルアルコールは、ビニルエステル系モノマーの重合体をケン化することにより得られる樹脂である。ビニルエステル系モノマーとしては、例えばギ酸ビニル、酢酸ビニル、プロピオン酸ビニル、バレリン酸ビニル、カプリン酸ビニル、ラウリン酸ビニル、ステアリン酸ビニル、2,2,4,4-テトラメチルバレリアン酸ビニル、安息香酸ビニル、ピバリン酸ビニル、およびバーサティック酸ビニル等が挙げられる。中でも酢酸ビニル、プロピオン酸ビニル、ピバリン酸ビニル、バーサティック酸ビニルが単独もしくは混合物として好ましく使用される。
ポリアミドはアミド結合を主鎖に有する高分子である。ポリアミドとしては、例えば、ポリカプロアミド(ナイロン6)、ポリ-ω-アミノヘプタン酸(ナイロン7)、ポリ-ω-アミノノナン酸(ナイロン9)、ポリウンデカンアミド(ナイロン11)、ポリラウリルラクタム(ナイロン12)、ポリエチレンジアミンアジパミド(ナイロン26)、ポリテトラメチレンアジパミド(ナイロン46)、ポリヘキサメチレンアジパミド(ナイロン66)、ポリヘキサメチレンセバカミド(ナイロン610)、ポリヘキサメチレンドデカミド(ナイロン612)、ポリオクタメチレンアジパミド(ナイロン86)、ポリデカメチレンアジパミド(ナイロン106)、カプロラクタム/ラウリルラクタム共重合体(ナイロン6/12)、カプロラクタム/ω-アミノノナン酸共重合体(ナイロン6/9)、カプロラクタム/ヘキサメチレンジアンモニウムアジペート共重合体(ナイロン6/66)、ラウリルラクタム/ヘキサメチレンジアンモニウムアジペート共重合体(ナイロン12/66)、エチレンジアンモニウムアジペート/ヘキサメチレンジアンモニウムアジペート共重合体(ナイロン26/66)、カプロラクタム/ヘキサメチレンジアンモニウムアジペート/ヘキサメチレンジアンモニウムセバケート共重合体(ナイロン6/66/610)、エチレンジアンモニウムアジペート/ヘキサメチレンジアンモニウムアジペート/ヘキサメチレンジアンモニウムセバケート共重合体(ナイロン26/66/610)、ポリヘキサメチレンイソフタルアミド(ナイロン6I)、ポリヘキサメチレンテレフタルアミド(ナイロン6T)、ヘキサメチレンイソフタルアミド/ヘキサメチレンテレフタルアミド共重合体(ナイロン6I/6T)、11-アミノウンデカンアミド/ヘキサメチレンテレフタルアミド共重合体、ポリノナメチレンテレフタルアミド(ナイロン9T)、ポリデカメチレンテレフタルアミド(ナイロン10T)、ポリヘキサメチレンシクロヘキシルアミド、ポリノナメチレンシクロヘキシルアミドあるいはこれらのポリアミドをメチレンベンジルアミン、メタキシレンジアミン等の芳香族アミンで変性したものが挙げられる。また、メタキシリレンジアンモニウムアジペート等も挙げられる。
ポリアクリル酸塩としては、例えば、メチルアクリレートや、エチルアクリレート、n-プロピルアクリレート、イソプロピルアクリレート、n-ブチルアクリレート、イソブチルアクリレート、ペンチルアクリレート、2-エチルヘキシルアクリレート、デシルアクリレート、ドデシルアクリレート、ステアリルアクリレート、α-クロロエチルアクリレート、シクロヘキシルアクリレート、フェニルアクリレート、メトキシエチルアクリレート、エトキシエチルアクリレート、メトキシプロピルアクリレート、エトキシプロピルアクリレート等のアクリレート系単量体を重合した後、加水分解することによって製造できる。また、アクリロニトリルを重合して加水分解しても得られる。
ポリエチレングリコールはエチレングリコールおよびジエチレングリコール等の活性水素を2個以上有する化合物に、エチレンオキサイドを付加重合することにより製造される。
ポリアクリルアミドしては、アクリルアミドの単独重合体又はアクリルアミドと他の共重合可能なモノマーとの共重合体であって、アミド結合を有するものが用いられる。
水(B)は、後述の塩基性化合物(C)を溶解して所望のpHを有する水溶液を調製するとともに、上記EVOHを成形機内に広く拡散させ、該成形機内に存在する被パージング樹脂の排出を促す。
塩基性化合物(C)は、上記水(B)によって水溶液となり、成形機内をアルカリ条件(好ましくは強アルカリ条件)とすることで、成形機内に存在する被パージング樹脂の排出を促す役割を果たす。
本発明の樹脂組成物は、上記親水性樹脂(A)、水(B)、および塩基性化合物(C)以外にその他の熱可塑性樹脂(D)を含有してもよい。熱可塑性樹脂(D)は、親水性樹脂(A)以外の熱可塑性樹脂から構成されており、例えば本発明の樹脂組成物と成形機内の被パージング樹脂との相容性、および作業者の安全性を向上させるために、本発明の樹脂組成物に添加される。
本発明の樹脂組物は、本発明の効果を阻害しない範囲でその他の添加剤を含有していてもよい。その他の添加剤としては、例えば研磨剤、充填材、熱安定剤、加工助剤、ブロッキング防止剤、帯電防止剤、カップリング剤、酸化防止剤、滑沢剤、発泡剤、界面活性剤、および可塑剤、ならびにそれらの組み合わせが挙げられる。特に研磨剤は、成形機内の被パージング樹脂を物理的な研磨作用を通じて排出するために使用され、例えばアルミナ、ジルコニア、シリカ、二酸化チタン、炭酸カルシウム等の無機化合物で構成されるものが挙げられる。
本発明のパージング剤は、第1の実施態様としては上記樹脂組成物、すなわち、親水性樹脂(A)、水(B)および塩基性化合物(C)と、必要に応じて任意成分であるその他の熱可塑性樹脂(D)およびその他の添加剤とを含有する樹脂組成物から構成される。ここで、本明細書において、上記樹脂組成物で構成されるパージング剤を「第1のパージング剤」という。
本発明のパージング方法では、例えば、成形機内に、上記親水性樹脂(A)、水(B)および塩基性化合物(C)と、必要に応じて任意成分であるその他の熱可塑性樹脂(D)および/またはその他の添加剤とを含有する樹脂組成物が供給され、樹脂組成物が被パージング樹脂とともに排出される。ここで、本明細書において、このように樹脂組成物を用いて行われるパージング方法を「第1のパージング方法」という。
・A1:EVOH(株式会社クラレ製「エバールF101B」、エチレン単位含有量32モル%、ケン化度99モル%以上)
・A2:EVOH(株式会社クラレ製「エバールL171B」、エチレン単位含有量27モル%、ケン化度99モル%以上)
・A3:EVOH(株式会社クラレ製「エバールE105B」、エチレン単位含有量44モル%、ケン化度99モル%以上)
・A4:ポリビニルアルコール(株式会社クラレ製「ポバール29―99」、ケン化度99モル%以上)
・A5:ポリアミド(宇部興産株式会社製「UBE NYLON 1024B」)(ナイロン6)
・A6:EVOH(株式会社クラレ製「エバールG176B」、エチレン単位含有量48モル%、ケン化度99モル%以上)
・d1:低密度ポリエチレン(日本ポリエチレン株式会社製「LC-600A」、MFR 7g/10分)
・d2:低密度ポリエチレン(日本ポリエチレン株式会社製「UJ790」、MFR 50g/10分)
・d3:高密度ポリエチレン(日本ポリエチレン株式会社製「HB111R」、MFR 0.03g/10分)
EVOH(A1)100質量部を、135℃で1時間オートクレーブ処理をし、イオン交換水32質量部を含む含水EVOH樹脂を、イオン交換水260質量部および炭酸ナトリウム27質量部を含む濃度11質量%の炭酸ナトリウム水溶液に室温下で3時間浸漬した後、遠心分離機により余分な炭酸ナトリウム水溶液を除去することで、EVOH(A1)100質量部、イオン交換水32質量部、炭酸ナトリウム3.2質量部を含む含水EVOH樹脂を得た。得られた含水EVOH樹脂に低密度ポリエチレン(d1)264質量部をドライブレンドにより混合して、樹脂組成物(E1)を得た。得られた樹脂組成物(E1)のpHをpHメーター(ハンナ・インスツルメンツ・ジャパン株式会社製「HI-9812-5」)を用いて測定した。結果を表1に示す。
EVOH(A1)の代わりにEVOH(A2)を用いたこと以外は配合例1と同様にして、樹脂組成物(E2)を得た。結果を表1に示す。
EVOH(A1)の代わりにEVOH(A3)を用いたこと以外は配合例1と同様にして、樹脂組成物(E3)を得た。結果を表1に示す。
ポリビニルアルコール(A4)100質量部を、イオン交換水180質量部および炭酸ナトリウム18質量部を含む濃度10質量%の炭酸ナトリウム水溶液に60℃で8時間浸漬した後、遠心分離機により余分な炭酸ナトリウム水溶液を除去することで、ポリビニルアルコール(A4)100質量部、イオン交換水32質量部、炭酸ナトリウム3.2質量部を含む含水ポリビニルアルコール樹脂を得た。得られた含水ポリビニルアルコール樹脂に低密度ポリエチレン(d1)264質量部をドライブレンドにより混合して、樹脂組成物(E4)を得た。得られた樹脂組成物(E4)のpHをpHメーター(ハンナ・インスツルメンツ・ジャパン株式会社製「HI-9812-5」)を用いて測定した。結果を表1に示す。
ポリアミド(A5)100質量部を135℃で3時間オートクレーブ処理をし、イオン交換水30質量部を含む含水ポリアミド樹脂を得た。得られたポリアミド樹脂を、イオン交換水235質量部および炭酸ナトリウム25質量部を含む濃度11質量%の炭酸ナトリウム水溶液に室温下で3時間浸漬した後、遠心分離機により余分な炭酸ナトリウム水溶液を除去することで、ポリアミド(A5)100質量部、イオン交換水32質量部、炭酸ナトリウム3.2質量部を含む含水ポリアミド樹脂を得た。得られた含水ポリアミド樹脂に低密度ポリエチレン(d1)264質量部をドライブレンドにより混合して、樹脂組成物(E5)を得た。得られた樹脂組成物(E5)のpHをpHメーター(ハンナ・インスツルメンツ・ジャパン株式会社製「HI-9812-5」)を用いて測定した。結果を表1に示す。
イオン交換水、炭酸ナトリウム、および低密度ポリエチレン(d1)の配合量を表1に記載の通りとしたこと以外は配合例1と同様にして、樹脂組成物(E6)~(E9)を得た。結果を表1に示す。
炭酸ナトリウムの代わりにリン酸三ナトリウム2.5質量部を用いたこと以外は配合例1と同様にして、樹脂組成物(E10)を得た。結果を表1に示す。
炭酸ナトリウムの代わりに水酸化ナトリウム1.3質量部を用いたこと以外は配合例1と同様にして、樹脂組成物(E11)を得た。結果を表1に示す。
炭酸ナトリウムの代わりに炭酸カリウム3.2質量部を用いたこと以外は配合例1と同様にして、樹脂組成物(E12)を得た。結果を表1に示す。
EVOH(A1)100質量部とイオン交換水32質量部を含む含水EVOH樹脂を、イオン交換水260質量部およびアンモニア32質量部を含む濃度11質量%のアンモニア水に室温下で、密閉した状態で3時間浸漬した後、遠心分離機により余分なアンモニア水溶液を除去することで、EVOH(A1)100質量部、イオン交換水32質量部、アンモニア3.2質量部を含む含水EVOH樹脂を得た。得られた含水EVOH樹脂に低密度ポリエチレン(d1)264質量部をドライブレンドにより混合して、樹脂組成物(E13)を得た。
イオン交換水および炭酸ナトリウムの配合量を表1に記載の通りとしたこと、および低密度ポリエチレン(d1)を用いなかったこと以外は配合例1と同様にして、樹脂組成物(E14)を得た。結果を表1に示す。
イオン交換水および炭酸ナトリウムの配合量を表1に記載の通りとしたこと、および低密度ポリエチレン(d1)244.4質量部を用い、かつさらに低密度ポリエチレン(d2)12.2質量部を用いたこと以外は配合例1と同様にして、樹脂組成物(E15)を得た。結果を表1に示す。
炭酸ナトリウムの代わりに酢酸ナトリウム3.2質量部を用いたこと以外は配合例1と同様にして、樹脂組成物(E16)を得た。結果を表1に示す。
EVOH(A1)を用いず、濃度9質量%の炭酸ナトリウム水溶液(pH=12.0)3.3質量部、および低密度ポリエチレン(d1)95質量部を混合して、樹脂組成物(E17)を得た。結果を表1に示す。
EVOH(A1)を用いず、濃度9質量%アンモニア水(pH=11.0)5.5質量部、および低密度ポリエチレン(d1)94質量部を混合して、樹脂組成物(E18)を得た。結果を表1に示す。
イオン交換水0.9質量部と炭酸ナトリウム0.2質量部を用いたこと以外は配合例1と同様にして、樹脂組成物(C1)を得た。結果を表1に示す。
イオン交換水60質量部と炭酸ナトリウム12質量部を用いたこと以外は配合例1と同様にして、樹脂組成物(C2)を得た。結果を表1に示す。
低密度ポリエチレン(d1)268質量部を用い、かつ炭酸ナトリウムを用いなかったこと以外は配合例1と同様にして、樹脂組成物(C3)を得た。結果を表1に示す。
高密度ポリエチレン(d3)1188質量部を用いたこと以外は配合例12と同様にして、樹脂組成物(E19)を得た。結果を表1に示す。
二軸押出機(東洋精機株式会社製「2D25W」;L/D=25)に、被パージング樹脂としてEVOH(A1)を10分間通過させ、該押出機内に被パージング樹脂を残留させた。スクリューの回転を止めて30分間滞留させた後、高密度ポリエチレン(株式会社プライムポリマー社製「HI-ZEX 7000F」)を該押出機内に5分間通過させ、ダイを取り外した。その後、シリンダーを290℃まで加熱し、空気を流入させながら、スクリュー回転数10rpmで3時間加熱することで、被パージング樹脂を酸化劣化させた。
各実施例および比較例において、上記パージングの後、ダイを分解し、二軸スクリューを取り出して、スクリューに付着していた被パージング樹脂を銅へラにより回収した。回収された被パージング樹脂の重量を測定した。結果を表2に示す。
各実施例および比較例において、ホッパーに樹脂組成物を投入する際にホッパーに付着して残留する該樹脂組成物の有無を目視で確認し、以下の基準で評価した。結果を表2に示す。
A:投入した樹脂組成物がホッパーに付着していなかった。
B:投入した樹脂組成物がわずかにホッパーに付着していた。
C:投入した樹脂組成物が大量にホッパーに付着していた。
各実施例および比較例において、二軸押出機の代わりに単軸押出機(東洋精機株式会社製「D2020」;L/D=20)を用いたこと以外は同様のパージング操作を行った。その際に、ホッパーから投入された樹脂組成物が押出機内に供給(フィード)される状態を目視で確認し、以下の基準で評価した。結果を表2に示す。
A:樹脂組成物はホッパーから自動的にフィードされた。
B:樹脂組成物は断続的に押し棒を使うことによりホッパーからフィードすることができた。
C:樹脂組成物は常に押し棒を使わなければホッパーからフィードすることができなかった。
表2に示す樹脂組成物(E1)~(E19)を用い、表2に示すパージ温度を採用したこと以外は、実施例1と同様にして押出機内に残留する被パージング樹脂をパージングした。結果を表2に示す。
樹脂組成物(E1)の代わりに、EVOH(A6)100質量部および低密度ポリエチレン(d1)264質量部を該押出機のホッパーから導入し、該押出機の供給部から濃度10質量%の炭酸ナトリウム水溶液(pH=12.0)20質量部を添加することで、該押出機内でパージング剤を形成させ、押出機内に残留する被パージング樹脂をパージングした以外は実施例1と同様にしてパージングを行った。結果を表2に示す。
樹脂組成物(E1)の代わりに、EVOH(A1)100質量部とイオン交換水25質量部を含む含水EVOH樹脂および低密度ポリエチレン(d1)264質量部を該押出機のホッパーから導入し、濃度15質量%の炭酸ナトリウム水溶液(pH=12.0)20質量部を添加することで、該押出機内でパージング剤を形成させ、押出機内に残留する被パージング樹脂をパージングした以外は実施例1と同様にしてパージングを行った。結果を表2に示す。
表2に示す樹脂組成物(C1)~(C3)、および(E1)を用い、表2に示すパージ温度を採用したこと以外は、実施例1と同様にして押出機内に残留する被パージング樹脂をパージングした。結果を表2に示す。
Claims (26)
- 親水性樹脂(A)、水(B)、および塩基性化合物(C)を含有する樹脂組成物であって、親水性樹脂(A)と水(B)との質量比(A)/(B)が66/34~90/10であり、親水性樹脂(A)100質量部に対して、塩基性化合物(C)の含有量が0.25~7質量部である樹脂組成物。
- さらに他の熱可塑性樹脂(D)を含有する請求項1に記載の樹脂組成物。
- 親水性樹脂(A)100質量部に対して、他の熱可塑性樹脂(D)の含有量が1~10000質量部である請求項2に記載の樹脂組成物。
- 親水性樹脂(A)と水(B)とが一緒になって含水親水性樹脂の形態で含有されている請求項1~3のいずれかに記載の樹脂組成物。
- 塩基性化合物(C)が、炭酸アルカリ金属塩、重炭酸アルカリ金属塩、リン酸アルカリ金属塩、酢酸アルカリ金属塩、アルカリ金属の水酸化物、アンモニアおよび第一級から第三級アミンからなる群から選ばれる少なくとも1種である請求項1~4のいずれかに記載の樹脂組成物。
- 水(B)と塩基性化合物(C)が一緒になってアルカリ水溶液の形態で含有されている請求項1~3のいずれかに記載の樹脂組成物。
- アルカリ水溶液のpHが8~14である請求項6に記載の樹脂組成物。
- 塩基性化合物(C)が、炭酸アルカリ金属塩、重炭酸アルカリ金属塩、リン酸アルカリ金属塩、酢酸アルカリ金属塩、アンモニアおよび第一級から第三級アミンからなる群から選ばれる少なくとも1種である請求項6または7に記載の樹脂組成物。
- 親水性樹脂(A)がエチレン-ビニルアルコール共重合体である請求項1~8のいずれかに記載の樹脂組成物。
- エチレン-ビニルアルコール共重合体のエチレン単位含有量が15~60モル%である請求項9に記載の樹脂組成物。
- 請求項1~10のいずれかに記載の樹脂組成物を含有するパージング剤。
- 親水性樹脂(A)および塩基性化合物(C)を含有し、親水性樹脂(A)100質量部に対して、塩基性化合物(C)の含有量が0.25~7質量部であるパージング剤。
- さらに他の熱可塑性樹脂(D)を含有する請求項12に記載のパージング剤。
- 親水性樹脂(A)100質量部に対して、他の熱可塑性樹脂(D)の含有量が1~10000質量部である請求項13に記載のパージング剤。
- 塩基性化合物(C)が、炭酸アルカリ金属塩、重炭酸アルカリ金属塩、リン酸アルカリ金属塩、酢酸アルカリ金属塩、アルカリ金属の水酸化物、アンモニアおよび第一級から第三級アミンからなる群から選ばれる少なくとも1種である請求項12~14のいずれかに記載のパージング剤。
- 親水性樹脂(A)がエチレン-ビニルアルコール共重合体である請求項12~15のいずれかに記載のパージング剤。
- エチレン-ビニルアルコール共重合体のエチレン単位含有量が15~60モル%である請求項16に記載のパージング剤。
- 被パージング樹脂を含む成形機のパージング方法であって、
成形機内に、親水性樹脂(A)、水(B)、および塩基性化合物(C)を含有する樹脂組成物を供給して、該樹脂組成物を被パージング樹脂とともに排出する工程を含み、
親水性樹脂(A)と水(B)との質量比(A)/(B)が90/10~66/34であり、親水性樹脂(A)100質量部に対して、塩基性化合物(C)の含有量が0.25~7質量部であるパージング方法。 - 成形機に対し、親水性樹脂(A)、水(B)、および塩基性化合物(C)が、請求項11に記載のパージング剤の形態で供給される請求項18に記載のパージング方法。
- 成形機に対し、親水性樹脂(A)および塩基化合物(C)が、請求項12~17のいずれかに記載のパージング剤の形態で供給される請求項18に記載のパージング方法。
- 成形機の溶融領域における温度が105~230℃である請求項18~20のいずれかに記載のパージング方法。
- 親水性樹脂(A)がエチレン-ビニルアルコール共重合体である請求項18~21のいずれかに記載のパージング剤。
- エチレン-ビニルアルコール共重合体のエチレン単位含有量が15~60モル%である請求項22に記載のパージング剤。
- 被パージング樹脂を含む成形機のパージング方法であって、
成形機内に、水(B)および塩基性化合物(C)を含有するアルカリ水溶液を供給して、該アルカリ水溶液を被パージング樹脂とともに排出する工程を含むパージング方法。 - さらに、成形機内に親水性樹脂(A)および他の熱可塑性樹脂(D)を供給する工程を含む請求項24に記載のパージング方法。
- アルカリ水溶液のpHが8~14である請求項24または25に記載のパージング方法。
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US (1) | US20230193014A1 (ja) |
EP (1) | EP4006101A4 (ja) |
JP (1) | JP7535521B2 (ja) |
KR (1) | KR20220043181A (ja) |
CN (1) | CN114144466A (ja) |
BR (1) | BR112022000095A2 (ja) |
MX (1) | MX2022001267A (ja) |
WO (1) | WO2021019873A1 (ja) |
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WO2023120338A1 (ja) * | 2021-12-21 | 2023-06-29 | 株式会社クラレ | 樹脂組成物、ならびにそれを用いたパージング剤および成形機のパージング方法 |
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EP4006101A4 (en) | 2024-01-03 |
JPWO2021019873A1 (ja) | 2021-02-04 |
US20230193014A1 (en) | 2023-06-22 |
KR20220043181A (ko) | 2022-04-05 |
EP4006101A1 (en) | 2022-06-01 |
MX2022001267A (es) | 2022-02-22 |
BR112022000095A2 (pt) | 2022-02-15 |
CN114144466A (zh) | 2022-03-04 |
JP7535521B2 (ja) | 2024-08-16 |
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