WO2022201669A1 - ポリアセタール樹脂組成物、及びこのポリアセタール樹脂組成物の成形品を備える硫黄燃料接触体 - Google Patents
ポリアセタール樹脂組成物、及びこのポリアセタール樹脂組成物の成形品を備える硫黄燃料接触体 Download PDFInfo
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- WO2022201669A1 WO2022201669A1 PCT/JP2021/046191 JP2021046191W WO2022201669A1 WO 2022201669 A1 WO2022201669 A1 WO 2022201669A1 JP 2021046191 W JP2021046191 W JP 2021046191W WO 2022201669 A1 WO2022201669 A1 WO 2022201669A1
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/101—Esters; Ether-esters of monocarboxylic acids
- C08K5/103—Esters; Ether-esters of monocarboxylic acids with polyalcohols
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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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
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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
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium 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
- C08L59/00—Compositions of polyacetals; Compositions of derivatives of polyacetals
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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
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
- C08L71/02—Polyalkylene oxides
Definitions
- the present invention relates to a polyacetal resin composition and a sulfur fuel contactor comprising a molded article of this polyacetal resin composition.
- molded products made from polyacetal resin are widely used as automotive parts.
- it is used as a large-sized part such as a fuel transfer unit represented by a fuel pump module that directly contacts fuel oil.
- an injection-molded product manufactured from polyacetal resin has residual stress inside the molded product due to cooling during injection molding. If this injection molded product comes into contact with high-sulfur fuel or the like, cracks may occur at locations where residual stress is large, which may cause troubles such as fuel leakage. Therefore, for countries where high-sulfur fuels are distributed, it is necessary to use resin materials having high resistance to high-sulfur fuels (hereinafter abbreviated as fuel resistance) as raw materials.
- fuel resistance resin materials having high resistance to high-sulfur fuels
- Patent Document 1 The applicant of the present application reports that this problem can be greatly improved by adding a hindered phenolic antioxidant, an alkaline earth metal oxide, a polyalkylene glycol and a polyvalent fatty acid ester to the polyacetal resin.
- An object of the present invention is to provide a polyacetal resin composition that, when formed into a molded product, can suppress deterioration of parts that come into contact with high-sulfur fuel when exposed to sunlight.
- the present inventors found that the above problems can be solved by making the composition of the polyacetal resin composition a specific composition.
- the present invention is as follows. 1. at least, (A) for 100 parts by mass of polyacetal polymer, (B) 0.1 to 1.0 parts by mass of a hindered phenol antioxidant; (C) 0.3 parts by mass to 2.0 parts by mass of at least one selected from oxides of magnesium and zinc; (D) 0.5 to 3.0 parts by mass of polyalkylene glycol, (E) 0.1 to 1.5 parts by mass of a hindered amine compound, (F) 0.2 to 1.5 parts by mass of an ultraviolet absorber, (G) 0.01 to 1.0 mass of a fatty acid ester of a polyhydric alcohol having an esterification rate of 80% or more; A polyacetal resin composition containing 2. 2.
- the UV absorber is 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol and N-(2-ethylphenyl)-N' 6.
- a fuel contactor comprising a molded article of the polyacetal resin composition according to any one of 1 to 6 above.
- the present invention it is possible to provide a polyacetal resin composition that, when formed into a molded product, can suppress deterioration of parts that come into contact with high-sulfur fuel when exposed to sunlight.
- the polyacetal resin composition of the present invention is (A) per 100 parts by mass of the polyacetal polymer, (B) 0.1 to 1.0 parts by mass of a hindered phenolic antioxidant, (C) 0.3 parts by mass to 2.0 parts by mass of at least one selected from oxides of magnesium or zinc; (D) 0.5 to 3.0 parts by mass of polyalkylene glycol, (E) 0.1 to 1.5 parts by mass of a hindered amine compound, (F) 0.2 to 1.5 parts by mass of an ultraviolet absorber, (G) 0.01 to 1.0 mass of a fatty acid ester of a polyhydric alcohol having an esterification rate of 80% or more; It is characterized by containing and.
- the (A) polyacetal polymer used in the present invention may be a homopolymer having an oxymethylene group (—OCH 2 —) as a constituent unit, or may be a copolymer having other comonomer units in addition to the oxymethylene unit. , is preferably a copolymer.
- trioxane which is a cyclic trimer of formaldehyde
- Trioxane is generally obtained by reacting an aqueous formaldehyde solution in the presence of an acidic catalyst, and is used after being purified by a method such as distillation.
- the trioxane used for polymerization preferably contains as little impurities as possible such as water, methanol and formic acid.
- the above polyacetal polymer can generally be obtained by adding an appropriate amount of molecular weight modifier and cationic polymerization using a cationic polymerization catalyst.
- Molecular weight modifiers to be used, cationic polymerization catalysts, polymerization methods, polymerization equipment, catalyst deactivation treatment after polymerization, terminal stabilization treatment methods for crude polyacetal polymers obtained by polymerization, etc. are known from many documents. Yes, you can basically use any of them.
- a reaction tank with a stirrer that is generally used in a batch system can be used, and as a continuous system, a co-kneader, a twin-screw continuous extrusion mixer, a twin-screw paddle type continuous mixer, etc.
- a continuous polymerization apparatus such as trioxane that has been proposed so far can be used, and a combination of two or more types of polymerization apparatuses can also be used.
- chain transfer agents known as molecular weight modifiers for controlling the degree of polymerization such as low molecular weight linear acetals such as methylal, etc. can also be added.
- the polymerization reaction is desirably carried out in a state in which impurities having active hydrogen, such as water, methanol, formic acid, etc., are substantially absent, for example, in a state in which each of these is 10 ppm or less. It is desirable to use trioxane, cyclic ethers and/or cyclic formals prepared to contain as little as possible as main monomers and comonomers.
- the molecular weight of the (A) polyacetal polymer used in the present invention is not particularly limited, but the weight average molecular weight corresponding to PMMA (polymethyl methacrylate) determined by size exclusion chromatography is 10,000 to 400,000. A degree is preferable.
- the melt index (measured at 190° C. and a load of 2.16 kg according to ASTM-D1238), which is an index of resin fluidity, is preferably 0.1 to 100 g/10 minutes, more preferably 0.5 to 100 g/10 minutes. 80 g/10 minutes.
- the (A) polyacetal polymer used in the present invention particularly preferably has specific terminal properties. Specifically, the amount of hemiformal terminal groups is 1.0 mmol/kg or less, the amount of formyl terminal groups is 0.5 mmol/kg or less, and the amount of unstable terminals is 0.5% by mass or less.
- the hemiformal terminal group is represented by —OCH 2 OH, and is also called a hydroxymethoxy group or a hemiacetal terminal group.
- a formyl end group is also indicated by -OCHO.
- the amounts of such hemiformal terminal groups and formyl terminal groups can be determined by 1 H-NMR measurement, and the specific measuring method can be referred to the method described in JP-A-2001-11143.
- the amount of unstable terminal indicates the amount of the portion existing at the terminal portion of the polyacetal polymer, unstable to heat and base, and easily decomposed.
- Such an unstable terminal amount was obtained by placing 1 g of polyacetal polymer together with 100 ml of a 50% (% by volume) methanol aqueous solution containing 0.5% (% by volume) of ammonium hydroxide in a sealed pressure-resistant vessel and heat-treating at 180° C. for 45 minutes. After cooling, the amount of formaldehyde decomposed and eluted in the solution obtained by opening the package was quantified and expressed in mass % with respect to the polyacetal polymer.
- the (A) polyacetal polymer used in the present invention preferably has a hemiformal terminal group content of 1.0 mmol/kg or less, more preferably 0.6 mmol/kg or less.
- the amount of formyl terminal groups is preferably 0.5 mmol/kg or less, more preferably 0.1 mmol/kg or less.
- the amount of unstable ends is preferably 0.5% by mass or less, more preferably 0.3% by mass or less.
- the lower limits of the amount of hemi-formal terminal groups, the amount of formyl terminal groups, and the amount of unstable terminals are not particularly limited.
- the (A) polyacetal polymer having specific terminal properties as described above can be produced by reducing impurities contained in the main monomer and comonomer, selecting the production process and optimizing the production conditions.
- the method for producing the (A) polyacetal polymer having specific terminal properties that satisfy the requirements of the present invention for example, the method described in JP-A-2009-286874 can be used. However, it is not limited to this method.
- a polyacetal polymer having a branched or crosslinked structure may be added to the polyacetal polymer (A), and in that case, the blending amount is 0.01 per 100 parts by mass of the polyacetal polymer (A). 20 parts by mass, particularly preferably 0.03 to 5 parts by mass.
- the (B) hindered phenol antioxidant used in the present invention includes 2,2′-methylenebis(4-methyl-6-t-butylphenol), 1,6-hexanediolbis[3-(3,5 -di-t-butyl-4-hydroxyphenyl)propionate], pentaerythritol tetrakis [3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], bis[3-t-butyl-4- Hydroxy-5-methylbenzenepropionic acid]ethylenebis(oxyethylene), 1,3,5-trimethyl-2,4,6-tris(3′,5′-di-t-butyl-4′-hydroxybenzyl) Benzene, n-octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, 4,4'-methylenebis(2,6-di-t-
- At least one or two or more selected from these antioxidants can be used.
- the content of (B) the hindered phenolic antioxidant in the present invention is 0.1 to 1.0 parts by mass, and 0.2 to 0.5 parts by mass with respect to 100 parts by mass of the (A) polyacetal resin. is more preferable.
- (C) at least one selected from oxides of magnesium or zinc examples include magnesium oxide and zinc oxide.
- magnesium oxide is most preferable because it has the best balance between improvement in fuel properties and performance such as mechanical properties and moldability.
- magnesium oxide having a BET specific surface area of 100 m 2 /g or more is more preferable.
- the content of the (C) compound in the present invention is 0.3 to 2.0 parts by mass, more preferably 0.5 to 2.0 parts by mass, relative to 100 parts by mass of the (A) polyacetal resin. .
- the fuel resistance is particularly excellent.
- the amount is within 2.0 parts by mass, stable production is possible, and when the amount is within 2.0 parts by mass, the balance of mechanical properties is particularly excellent.
- (D) Polyalkylene glycol It is also preferable to contain the (D) polyalkylene glycol used in the present invention.
- These types are not particularly limited, but from the viewpoint of affinity with the polyacetal resin, those containing polyethylene glycol or polypropylene glycol are preferred, and those containing polyethylene glycol are more preferred.
- the number average molecular weight (Mn) of the polyalkylene glycol is not particularly limited, but from the viewpoint of dispersibility in the polyacetal resin, it is preferably 1,000 or more and 50,000 or less, and 5,000 or more and 30,000 or less. It is more preferable to have In this specification, the number-average molecular weight is the polystyrene-equivalent molecular weight obtained by size exclusion chromatography using tetrahydrofuran (THF) as a solvent.
- THF tetrahydrofuran
- the content of (D) polyalkylene glycol in the present invention is 0.5 to 3.0 parts by mass, preferably 1.0 to 2.0 parts by mass, with respect to 100 parts by mass of (A) polyacetal resin. more preferred.
- the upper limit of the amount to be added is selected in balance with the mechanical properties of the molded article. These may be used in combination of two or more.
- the hindered amine compound (hereinafter also referred to as HALS) used in the present invention is not particularly limited, and a hindered amine compound in which the nitrogen of a piperidine derivative having a sterically hindering group such as a methyl group on the adjacent carbon is secondary or tertiary is preferably used. be done.
- Hindered amine stabilizers in which the nitrogen of the piperidine derivative having a sterically hindered group is secondary for use in the present invention include bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 1,2,3 ,4-butanetetracarboxylic acid, 2,2,6,6-tetramethyl-4-piperidinol and ⁇ , ⁇ , ⁇ ', ⁇ '-tetramethyl-3,9-(2,4,8,10-tetra oxaspiro[5.5]undecane)-diethanol condensate, tetrakis(2,2,6,6-tetramethyl-4-piperidyl) 1,2,3,4-butane tetracarboxylate, 1,2, A condensate of 3,4-butanetetracarboxylic acid, 2,2,6,6-tetramethyl-4-piperidinol and tridecyl alcohol is included.
- Examples of the hindered amine compounds in which the nitrogen of the piperidine derivative having a sterically hindering group is tertiary and which are used in the present invention include bis(1,2,2,6,6-pentamethyl-4-piperidyl)adipate, bis(1 - Aliphatic di- or tricarboxylic acid such as octyloxy-2,2,6,6-tetramethyl-4-piperidyl sebacate - bis or trispiperidyl ester (aliphatic dicarboxylic acid having 2 to 20 carbon atoms - bispiperidyl ester, etc.) ), N,N′,N′′,N′′′-tetrakis-(4,6-bis-(butyl-(N-methyl-2,2,6,6-tetramethylpiperidin-4-yl)amino )-triazin-2-yl)-4,7-diazadecane-1,10-diamine, a polymer of dimethyl succinate and 4-hydroxy-2,
- a polymer of ethanol can be mentioned.
- the addition amount of (E) the hindered amine compound is 0.1 to 1.5 parts by mass, preferably 0.2 to 0.8 parts by mass, per 100 parts by mass of the (A) polyacetal polymer. is.
- UV absorber of the present invention examples include benzotriazole-based compounds and oxalic acid anilide-based compounds, and these light stabilizers can be used singly or in combination of two or more.
- Benzotriazole compounds include 2-(2H-benzotriazol-2-yl)-p-cresol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1- phenylethyl)phenol, 2-[5-chloro(2H)-benzotriazol-2-yl)-4-methyl-6-(t-butyl)phenol, 2,4-di-t-butyl-6-(5 -chlorobenzotriazol-2-yl)phenol, 2-(2H-benzotriazol-2-yl)-4,6-di-t-pentylphenol, 2-(2H-benzotriazol-2-yl)-4- (1,1,3,3-tetramethylbutyl) phenol, 2-(2'-hydroxy-3',5'-di-isoamylphenyl) hydroxy groups such as benzotriazole and alkyl (alkyl having 1 to 6 carbon atoms) ) group-substi
- oxalic acid anilide compounds include N-(2-ethylphenyl)-N'-(2-ethoxy-5-t-butylphenyl)oxalic acid diamide, N-(2-ethylphenyl)-N'-(2 -ethoxyphenyl)oxalic acid diamide, and oxalic acid diamides having an optionally substituted aryl group on the nitrogen atom.
- the amount of (F) ultraviolet absorber added is 0.2 to 1.5 parts by mass with respect to 100 parts by mass of (A) polyacetal polymer. Preferably, it is 0.4 to 0.8 parts by mass. If the amount of the UV absorber (F) is too small, a polyacetal resin composition with excellent weather resistance cannot be obtained. Problems such as poor appearance due to
- the (G) fatty acid ester of a polyhydric alcohol having an esterification rate of 80% or more used in the present invention is a polyhydric fatty acid ester of an ester compound of a polyhydric alcohol having 3 or more carbon atoms and a fatty acid. preferable.
- the esterification rate of the ester compound is 80% or more, preferably 85% or more, more preferably 90% or more.
- the esterification rate refers to the ratio of hydroxyl groups that have reacted with fatty acids to form ester bonds among the hydroxyl groups of the polyhydric alcohol that form esters.
- the polyhydric alcohol may be aliphatic or aromatic, but it is preferably aliphatic in terms of affinity with the polyacetal resin.
- the valence of the polyhydric alcohol is not particularly limited, it is preferably 3 or more and 4 or less.
- the number of carbon atoms in the polyhydric alcohol is not particularly limited, it is preferably 3 or more and 10 or less, more preferably 3 or more and 5 or less, from the viewpoint of affinity with the polyacetal resin.
- Preferred polyhydric alcohols for forming the ester of component (G) include, for example, glycerin, trimethylolpropane, pentaerythritol, mesoerythritol, pentitose, hexitol, and sorbitol.
- the polyhydric alcohol is preferably pentaerythritol in that the weight loss of the resin composition can be kept low.
- the type of fatty acid is not particularly limited, but from the viewpoint of affinity with polyacetal resin, it is preferably a fatty acid having 10 to 30 carbon atoms, and an aliphatic carboxylic acid having 10 to 20 carbon atoms. is more preferred.
- Examples of preferred fatty acids for forming the ester of component (G) include stearic acid, palmitic acid, and lauric acid, with stearic acid being preferred.
- ester of component (G) glycerin tristearate and pentaerythritol tetrastearate are preferably used, and pentaerythritol tetrastearate is more preferably used.
- component (G) two or more esterified products having different polyhydric alcohols or fatty acids, or two or more esterified products having different esterification rates may be used in combination.
- the polyacetal resin composition in the present invention may contain other components as necessary.
- One or two or more known stabilizers for the polyacetal resin composition may be added as long as the objects and effects of the present invention are not impaired.
- a fuel contact body of the present invention includes a molded article of the polyacetal resin composition.
- the molded article is obtained by molding the polyacetal resin composition by a conventional molding method such as injection molding, extrusion molding, compression molding, blow molding, vacuum molding, foam molding, and rotational molding. be able to.
- a mixture of 96.7% by mass of trioxane and 3.3% by mass of 1,3-dioxolane was continuously supplied to a twin-screw paddle type continuous polymerization machine, and 15 ppm of boron trifluoride was added as a catalyst. Polymerization was carried out.
- the mixture of trioxane and 1,3-dioxolane used for polymerization contained 10 ppm of water, 3.5 ppm of methanol and 5 ppm of formic acid as impurities.
- aqueous solution containing 1000 ppm of triethylamine is immediately added to the polymer discharged from the outlet of the polymerizer, and the catalyst is deactivated by pulverization and stirring, followed by centrifugation and drying to obtain a crude polyacetal copolymer. rice field.
- this crude polyacetal copolymer is supplied to a twin-screw extruder having a vent port, and melt-kneaded at a resin temperature of about 220 ° C. to decompose unstable terminal portions and remove volatiles containing decomposition products from the vent port. was devolatilized under reduced pressure. The polymer taken out from the die of the extruder was cooled and chopped to obtain pellet-like polyacetal copolymer A-1 from which unstable terminal ends were removed.
- C Magnesium or zinc oxide
- C-1 Magnesium oxide, BET specific surface area 135 m 2 /g, average particle size 0.9 ⁇ m (product name: Kyowamag MF150, manufactured by Kyowa Chemical Industry Co., Ltd.)
- C-2 Magnesium oxide, BET specific surface area 145 m 2 /g, average particle size 0.6 ⁇ m (product name: Starmag PSF-150, manufactured by Kamijima Chemical Industry Co., Ltd.)
- C-3) Magnesium oxide, BET specific surface area 30 m 2 /g, average particle size 0.6 ⁇ m (product name: Kyowamag MF30, manufactured by Kyowa Chemical Industry Co., Ltd.)
- Zinc oxide, BET specific surface area 60 to 90 m 2 /g product name: activated zinc oxide AZO, manufactured by Seido Chemical Industry Co., Ltd.
- D Polyalkylene glycol (D-1) Product name: PEG6000S (manufactured by Sanyo Chemical Industries Co., Ltd.)
- E hindered amine compound (E-1) bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate (TINUVIN770DF: manufactured by BASF) (E-2) 1,2,3,4-butanetetracarboxylic acid, 1,2,2,6,6-pentamethyl-4-piperidinol, and ⁇ , ⁇ , ⁇ ', ⁇ '-tetramethyl-3,9 Condensate with -(2,4,8,10-tetraoxaspiro[5.5]undecane) diethanol (ADEKA STAB LA-63P: manufactured by ADEKA Co., Ltd.) (E-3) Tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl) 1,2,3,4-butane tetracarboxylate (ADEKA STAB LA-52: manufactured by ADEKA Corporation) (E-4) Condensation product of 1,2,3,4-butanetetracarboxylic acid, 1,2,2,6,6-pentamethyl-4-piperidin
- UV absorber F-1) 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (TINUVIN234: manufactured by BASF)
- G Fatty acid ester of polyhydric alcohol (G-1) Pentaerythritol stearate (Unistar H476, manufactured by NOF Corporation) (G-2) Glycerin tristearate (Poem S-95, manufactured by Riken Vitamin) (G-3) Glycerin monostearate (Rikemar S-100A, manufactured by Riken Vitamin Co., Ltd.) (G-4) stearin stearate (Unistar M9676, manufactured by NOF Corporation)
- Test device Ci4000 Xenon Weather-Ometer (manufactured by ATLAS)
- Light source xenon arc lamp
- Irradiance 0.55 W/m 2 wavelength 340 nm
- Black panel temperature 70°C Humidity: 50%
- RH Filter (inner) quartz, (outer) borosilicate “S” type
- Nominal tensile strain at break The nominal tensile strain at break was measured in accordance with ISO 527-1 and 2, and judged from ⁇ to ⁇ as follows. ⁇ : Less than 25% ⁇ : 25% or more and less than 29% ⁇ : 29% or more
- the present invention it is possible to provide a polyacetal resin composition that, when formed into a molded product, is capable of suppressing deterioration when sunlight is applied to the part that comes into contact with high-sulfur fuel.
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Abstract
Description
1. 少なくとも、
(A)ポリアセタール重合体100質量部に対し、
(B)ヒンダードフェノール系酸化防止剤0.1~1.0質量部、
(C)マグネシウム又は亜鉛の酸化物から選択される少なくとも一種を、0.3質量部~2.0質量部、
(D)ポリアルキレングリコール0.5~3.0質量部、
(E)ヒンダードアミン化合物0.1~1.5質量部、
(F)紫外線吸収剤0.2~1.5質量部、
(G)エステル化率が80%以上である多価アルコールの脂肪酸エステル0.01~1.0質量、
とを含有するポリアセタール樹脂組成物。
2. 前記(A)が、ホルムアルデヒドの環状オリゴマーと環状エーテル、又は環状ホルマールの何れかを共重合させてなるポリアセタールコポリマーである前記1記載のポリアセタール樹脂組成物。
3. 前記(C)が、BET比表面積が100cm2/g以上の酸化マグネシウムである、前記1又は2記載のポリアセタール樹脂組成物。
4. 前記(G)多価アルコールの脂肪酸エステルが、炭素数3以上の多価アルコールと脂肪酸とのエステル化合物である、前記1~3いずれかに記載のポリアセタール樹脂組成物。
5. 前記(F)紫外線吸収剤が、ベンゾトリアゾール系化合物又はシュウ酸ジアミド系化合物から選ばれた少なくとも一種である、前記1~4いずれかに記載のポリアセタール樹脂組成物。
6. 前記(F)紫外線吸収剤が、2-(2H-ベンゾトリアゾール-2-イル)-4,6-ビス(1-メチル-1-フェニルエチル)フェノール及びN-(2-エチルフェニル)-N‘-(2-エトキシフェニル)シュウ酸ジアミドから選ばれる少なくとも一種である、前記1~5いずれかに記載のポリアセタール樹脂組成物。
7. 前記1~6いずれかに記載のポリアセタール樹脂組成物の成形品を備える燃料接触体。
本発明のポリアセタール樹脂組成物は、
(A)ポリアセタール重合体100質量部に対し、(B)ヒンダードフェノール系酸化防止剤0.1~1.0質量部、
(C)マグネシウム又は亜鉛の酸化物から選択される少なくとも1種を、0.3質量部~2.0質量部、
(D)ポリアルキレングリコール0.5~3.0質量部、
(E)ヒンダードアミン化合物0.1~1.5質量部、
(F)紫外線吸収剤0.2~1.5質量部、
(G)エステル化率が80%以上である多価アルコールの脂肪酸エステル0.01~1.0質量、
とを含有することを特徴とする。
本発明に使用する(A)ポリアセタール重合体は、オキシメチレン基(-OCH2-)を構成単位とするホモポリマーでもよいし、オキシメチレン単位以外に他のコモノマー単位を有するコポリマーであってもよく、コポリマーであることが好ましい。
本発明において使用する(B)ヒンダードフェノール系酸化防止剤としては、2,2’-メチレンビス(4-メチル-6-t-ブチルフェノール)、1,6-ヘキサンジオールビス[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート]、ペンタエリスリトールテトラキス[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート]、ビス[3-t-ブチル-4-ヒドロキシ-5-メチルベンゼンプロピオン酸]エチレンビス(オキシエチレン)、1,3,5-トリメチル-2,4,6-トリス(3’,5’-ジ-t-ブチル-4’-ヒドロキシベンジル)ベンゼン、n-オクタデシル-3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート、4,4’-メチレンビス(2,6-ジ-t-ブチルフェノール)、4,4’-ブチリデン-ビス(6-t-ブチル-3-メチル-フェノール)、ジステアリル(3,5-ジ-t-ブチル-4-ヒドロキシベンジル)ホスホネート、2-t-ブチル-6-(3-t-ブチル-5-メチル-2-ヒドロキシベンジル)-4-メチルフェニルアクリレート、3,9-ビス{2-〔3-(3-t-ブチル-4-ヒドロキシ-5-メチルフェニル)プロピオニルオキシ〕-1,1-ジメチルエチル}-2,4,8,10-テトラオキサスピロ〔5,5〕ウンデカン等が例示される。
本発明において使用する(C)マグネシウム又は亜鉛の酸化物から選択される少なくとも一種(以下(C)化合物と略す)としては、酸化マグネシウム、酸化亜鉛等が挙げられる。これらの化合物の中では酸化マグネシウムが最も燃料性の改善と機械物性や成形性等の性能のバランスが優れており好ましい。酸化マグネシウムに関して、BET比表面積が100m2/g以上である酸化マグネシウムがより好ましい。
本発明において使用する(D)ポリアルキレングリコールを含有させることも好ましい。これらの種類は特に限定されないが、ポリアセタール樹脂との親和性の観点から、ポリエチレングリコール又はポリプロピレングリコールを含有するものが好ましく、ポリエチレングリコールを含有するものがより好ましい。
本発明において使用するヒンダードアミン化合物(以下HALSともいう)に特に制限がなく、隣接する炭素にメチル基等の立体障害性基を有するピペリジン誘導体の窒素が2級又は3級であるヒンダードアミン化合物が好ましく用いられる。
本発明の紫外線吸収剤としては、ベンゾトリアゾール系化合物、シュウ酸アニリド系化合物が挙げられ、これらの光安定剤は一種又は二種以上組合せて使用できる。
本発明において使用される(G)エステル化率が80%以上である多価アルコールの脂肪酸エステルは、炭素数が3以上の多価アルコールと脂肪酸とのエステル化合物の多価脂肪酸エステルであることが好ましい。
本発明におけるポリアセタール樹脂組成物は、必要に応じて他の成分を含有するものであってもよい。本発明の目的・効果を阻害しない限り、ポリアセタール樹脂組成物に対する公知の安定剤を一種又は二種以上添加することができる。
本発明の燃料接触体は、上記ポリアセタール樹脂組成物の成形品を備える。この成形品は、上記ポリアセタール樹脂組成物を用いて、慣用の成形方法、例えば、射出成形、押出成形、圧縮成形、ブロー成形、真空成形、発泡成形、回転成形等の方法で成形することにより得ることができる。
(A)ポリアセタール重合体
(A-1)ポリアセタールコポリマー[ヘミホルマール末端基量=1.0mmol/kg、メルトインデックス(ASTM-D1238に準じ190℃、荷重2.16kgで測定)=9g/10分]
ポリアセタール重合体A-1は、次のようにして調製した。
(B-1)ペンタエリスリトールテトラキス[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート](製品名:Irganox1010:BASF社製)
(C-1)酸化マグネシウム、BET比表面積135m2/g、平均粒径0.9μm(製品名:キョーワマグMF150、 協和化学工業(株)製)
(C-2)酸化マグネシウム、BET比表面積145m2/g、平均粒径0.6μm(製品名:スターマグPSF-150、 神島化学工業(株)製)
(C-3)酸化マグネシウム、BET比表面積30m2/g、平均粒径0.6μm(製品名:キョーワマグMF30、協和化学工業(株)製)
(C-4)酸化亜鉛、BET比表面積60~90m2/g(製品名:活性亜鉛華AZO, 正同化学工業(株)製)
(D-1)製品名:PEG6000S(三洋化成工業(株)製)
(E-1)ビス(2,2,6,6-テトラメチル-4-ピペリジル)セバケート(TINUVIN770DF:BASF社製)
(E-2)1,2,3,4-ブタンテトラカルボン酸と1,2,2,6,6-ペンタメチル-4-ピペリジノールとβ,β,β’,β’-テトラメチル-3,9-(2,4,8,10-テトラオキサスピロ[5.5]ウンデカン)ジエタノールとの縮合物(アデカスタブLA-63P:(株)ADEKA社製)
(E-3)テトラキス(1,2,2,6,6-ペンタメチル-4-ピペリジル)1,2,3,4-ブタンテトラカルボキシレート(アデカスタブLA-52:(株)ADEKA社製)
(E-4)1,2,3,4-ブタンテトラカルボン酸と1,2,2,6,6-ペンタメチル-4-ピペリジノールとトリデシルアルコールとの縮合物(アデカスタブLA-62:(株)ADEKA社製)
(F-1)2-(2H-ベンゾトリアゾ-ル-2-イル)-4,6-ビス(1-メチル-1-フェニルエチル)フェノール(TINUVIN234:BASF社製)
(F-2)N-(2-エチルフェニル)-N’-(2-エトキシ-フェニル)シュウ酸ジアミド(SanduvorVSU:クラリアント(株)製)
(G-1)ペンタエリストールステアリン酸エステル(ユニスターH476、日油社製)
(G-2)グリセリントリステアレート(ポエムS-95、理研ビタミン社製)
(G-3)グリセリンモノステアレート(リケマールS-100A、理研ビタミン社製)
(G-4)ステアリンステアレート(ユニスターM9676、日油社製)
表1、2に示す各種成分を表1、2に示す割合で添加混合し、二軸の押出機で溶融混練してペレット状のポリアセタール樹脂組成物を調製した。表内の数値は、質量部である。測定、評価は特に断りのない限り23℃50%RHの雰囲気下で行った。結果を表1~3に示す。
上記の通り調製したポリアセタール樹脂組成物を用い、下記条件で射出成形により厚さ4mmのISOtype1-A多目的試験片を作製し、以下の評価を行った。
・成形機: EC-40(東芝機械(株))
・成形条件:シリンダー温度(℃) ノズル-C1- C2- C3
205 215 205 185℃
射出圧力 40(MPa)
射出速度 1.5(m/min)
金型温度 90(℃)
上記試験片をディーゼル燃料(製品名:CEC RF 90-A-92,ハルターマン社製)に100℃で14日間浸漬し、その前後の試験片の質量から燃料浸漬による質量変化率を算出し耐燃料性の評価とした。下記の水準で評価した。
算出方法:(浸漬前の試験片質量-浸漬後の試験片質量)÷(浸漬前の試験片質量)
○:10%未満
△:10%以上20%未満
×:20%以上
SAE J2527に従い、以下の装置、条件にて耐候性を評価した。
試験装置:Ci4000 Xenon Weather-Ometer(ATLAS社製)
光源:キセノンアークランプ
照射照度:0.55W/m2 波長 340nm
ブラックパネル温度:70℃
湿度:50%RH
フィルタ:(内側)石英、(外側)ボロシリケート“S”タイプ
1.ダーク(0J/m2)、両面水噴射-60分
2.ライト(1320J/m2)-40分
3.ライト(660J/m2)、前面水噴射-20分
4.ライト(1980J/m2)-60分
処理後の試験片の表面を目視、顕微鏡で観察し、クラックの入り方で以下の様に区分した。
○:外観異常なし。
△:実体顕微鏡観察(拡大倍率50倍)でクラックが確認できる。
×:目視でクラックが確認できる。
多目的試験片を60℃、95%RHの条件で96時間保存処理した。
≪評価法≫
保存処理した試験片の外観を、目視によって下記の通りに区分した。
○:試験片表面に染み出し物は観察されない。
△:試験片表面にわずかな染み出し物が観察される。
×:試験片表面に多量の染み出し物が観察される。
ISO527-1、2に準拠した引張破壊呼び歪の測定を実施し、以下の通りに×から〇に判断した。
×:25%未満
△:25%以上29%未満
〇:29%以上
Claims (7)
- 少なくとも、
(A)ポリアセタール重合体100質量部に対し、
(B)ヒンダードフェノール系酸化防止剤0.1~1.0質量部、
(C)マグネシウム又は亜鉛の酸化物から選択される少なくとも一種を、0.3質量部~2.0質量部、
(D)ポリアルキレングリコール0.5~3.0質量部、
(E)ヒンダードアミン化合物0.1~1.5質量部、
(F)紫外線吸収剤0.2~1.5質量部、
(G)エステル化率が80%以上である多価アルコールの脂肪酸エステル0.01~1.0質量、
とを含有するポリアセタール樹脂組成物。 - 前記(A)が、ホルムアルデヒドの環状オリゴマーと環状エーテル、又は環状ホルマールの何れかを共重合させてなるポリアセタールコポリマーである請求項1記載のポリアセタール樹脂組成物。
- 前記(C)が、BET比表面積が100cm2/g以上の酸化マグネシウムである、請求項1又は2記載のポリアセタール樹脂組成物。
- 前記(G)多価アルコールの脂肪酸エステルが、炭素数3以上の多価アルコールと脂肪酸とのエステル化合物である、請求項1~3いずれかに記載のポリアセタール樹脂組成物。
- 前記(F)紫外線吸収剤が、ベンゾトリアゾール系化合物又はシュウ酸ジアミド系化合物から選ばれた少なくとも1種である、請求項1~4いずれかに記載のポリアセタール樹脂組成物。
- 前記(F)紫外線吸収剤が、2-(2H-ベンゾトリアゾール-2-イル)-4,6-ビス(1-メチル-1-フェニルエチル)フェノール及びN-(2-エチルフェニル)-N‘-(2-エトキシフェニル)シュウ酸ジアミドから選ばれる少なくとも1種である、請求項1~5いずれかに記載のポリアセタール樹脂組成物。
- 請求項1~6いずれかに記載のポリアセタール樹脂組成物の成形品を備える燃料接触体。
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