JP2019056118A - ポリオキシメチレン樹脂組成物の製造方法 - Google Patents
ポリオキシメチレン樹脂組成物の製造方法 Download PDFInfo
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- JP2019056118A JP2019056118A JP2018216125A JP2018216125A JP2019056118A JP 2019056118 A JP2019056118 A JP 2019056118A JP 2018216125 A JP2018216125 A JP 2018216125A JP 2018216125 A JP2018216125 A JP 2018216125A JP 2019056118 A JP2019056118 A JP 2019056118A
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- copolymer
- acid
- resin composition
- polyoxymethylene
- polyoxymethylene resin
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- -1 polyoxymethylene Polymers 0.000 title claims abstract description 69
- 229920006324 polyoxymethylene Polymers 0.000 title claims abstract description 38
- 239000011342 resin composition Substances 0.000 title claims abstract description 36
- 229930040373 Paraformaldehyde Natural products 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 229920001577 copolymer Polymers 0.000 claims abstract description 53
- 229920005989 resin Polymers 0.000 claims abstract description 45
- 239000011347 resin Substances 0.000 claims abstract description 45
- 238000011282 treatment Methods 0.000 claims abstract description 17
- 229920005648 ethylene methacrylic acid copolymer Polymers 0.000 claims abstract description 16
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 claims abstract description 11
- 239000002685 polymerization catalyst Substances 0.000 claims abstract description 8
- 238000007334 copolymerization reaction Methods 0.000 claims abstract description 7
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 5
- 239000003963 antioxidant agent Substances 0.000 claims description 16
- 230000003078 antioxidant effect Effects 0.000 claims description 15
- 125000002485 formyl group Chemical group [H]C(*)=O 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 4
- 239000008116 calcium stearate Substances 0.000 claims description 4
- 235000013539 calcium stearate Nutrition 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 3
- 150000001298 alcohols Chemical class 0.000 claims description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract description 76
- 150000003839 salts Chemical class 0.000 abstract description 19
- 230000006641 stabilisation Effects 0.000 abstract description 16
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- 230000000704 physical effect Effects 0.000 abstract description 4
- 238000004898 kneading Methods 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 238000002845 discoloration Methods 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 22
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 19
- 239000000047 product Substances 0.000 description 19
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 18
- 229920012196 Polyoxymethylene Copolymer Polymers 0.000 description 16
- WTEOIRVLGSZEPR-UHFFFAOYSA-N boron trifluoride Chemical compound FB(F)F WTEOIRVLGSZEPR-UHFFFAOYSA-N 0.000 description 16
- 238000006116 polymerization reaction Methods 0.000 description 15
- 239000003054 catalyst Substances 0.000 description 14
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- 239000007864 aqueous solution Substances 0.000 description 8
- 230000000996 additive effect Effects 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 150000007933 aliphatic carboxylic acids Chemical class 0.000 description 6
- 125000004122 cyclic group Chemical group 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- WNXJIVFYUVYPPR-UHFFFAOYSA-N 1,3-dioxolane Chemical compound C1COCO1 WNXJIVFYUVYPPR-UHFFFAOYSA-N 0.000 description 5
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- 238000000354 decomposition reaction Methods 0.000 description 5
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- 229910052784 alkaline earth metal Chemical class 0.000 description 4
- 150000001342 alkaline earth metals Chemical class 0.000 description 4
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
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- VDZOOKBUILJEDG-UHFFFAOYSA-M tetrabutylammonium hydroxide Chemical compound [OH-].CCCC[N+](CCCC)(CCCC)CCCC VDZOOKBUILJEDG-UHFFFAOYSA-M 0.000 description 4
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 3
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 150000001340 alkali metals Chemical class 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 150000007514 bases Chemical class 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 3
- 150000001735 carboxylic acids Chemical class 0.000 description 3
- 238000010538 cationic polymerization reaction Methods 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 150000004292 cyclic ethers Chemical class 0.000 description 3
- 235000019253 formic acid Nutrition 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- IMFACGCPASFAPR-UHFFFAOYSA-N tributylamine Chemical compound CCCCN(CCCC)CCCC IMFACGCPASFAPR-UHFFFAOYSA-N 0.000 description 3
- BYEAHWXPCBROCE-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropan-2-ol Chemical compound FC(F)(F)C(O)C(F)(F)F BYEAHWXPCBROCE-UHFFFAOYSA-N 0.000 description 2
- AUAGGMPIKOZAJZ-UHFFFAOYSA-N 1,3,6-trioxocane Chemical compound C1COCOCCO1 AUAGGMPIKOZAJZ-UHFFFAOYSA-N 0.000 description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- KZMGYPLQYOPHEL-UHFFFAOYSA-N Boron trifluoride etherate Chemical compound FB(F)F.CCOCC KZMGYPLQYOPHEL-UHFFFAOYSA-N 0.000 description 2
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
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- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 2
- OKOBUGCCXMIKDM-UHFFFAOYSA-N Irganox 1098 Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)NCCCCCCNC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 OKOBUGCCXMIKDM-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical class C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 description 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
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- DTQVDTLACAAQTR-UHFFFAOYSA-N Trifluoroacetic acid Chemical compound OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 description 2
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- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- YZXBAPSDXZZRGB-DOFZRALJSA-N arachidonic acid Chemical compound CCCCC\C=C/C\C=C/C\C=C/C\C=C/CCCC(O)=O YZXBAPSDXZZRGB-DOFZRALJSA-N 0.000 description 2
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- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical compound CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 description 2
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- 238000007086 side reaction Methods 0.000 description 2
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- QSRJVOOOWGXUDY-UHFFFAOYSA-N 2-[2-[2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propanoyloxy]ethoxy]ethoxy]ethyl 3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C)=CC(CCC(=O)OCCOCCOCCOC(=O)CCC=2C=C(C(O)=C(C)C=2)C(C)(C)C)=C1 QSRJVOOOWGXUDY-UHFFFAOYSA-N 0.000 description 1
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- QQOWHRYOXYEMTL-UHFFFAOYSA-N triazin-4-amine Chemical class N=C1C=CN=NN1 QQOWHRYOXYEMTL-UHFFFAOYSA-N 0.000 description 1
- 150000003628 tricarboxylic acids Chemical class 0.000 description 1
- YNJBWRMUSHSURL-UHFFFAOYSA-N trichloroacetic acid Chemical compound OC(=O)C(Cl)(Cl)Cl YNJBWRMUSHSURL-UHFFFAOYSA-N 0.000 description 1
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 239000013638 trimer Substances 0.000 description 1
- QQIVNUPLBOUZMR-UHFFFAOYSA-N trioxepane Chemical compound C1CCOOOC1 QQIVNUPLBOUZMR-UHFFFAOYSA-N 0.000 description 1
- 229960002703 undecylenic acid Drugs 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
- HQYCOEXWFMFWLR-UHFFFAOYSA-K vanadium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[V+3] HQYCOEXWFMFWLR-UHFFFAOYSA-K 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
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- Compositions Of Macromolecular Compounds (AREA)
- Polyoxymethylene Polymers And Polymers With Carbon-To-Carbon Bonds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
Description
本発明は、共重合終了後に重合触媒を失活させているが、不安定末端基を安定化していない粗オキシメチレン共重合体に対し、上記安定化処理を行うことなく、ヒンダードフェノール系酸化防止剤と、エチレンメタクリル酸共重合樹脂若しくはエチレンアクリル酸共重合樹脂又はそれらの塩と、アルカリ土類金属化合物とを溶融混錬し、ポリオキシメチレン樹脂組成物を製造する。
本発明において、粗オキシメチレン共重合体は、共重合終了後に重合触媒を失活させているが、不安定末端基を安定化していない。そして、不安定末端基を安定化する安定化処理を行うことなく、粗オキシメチレン共重合体と、各種の添加剤とを溶融混錬する。
本発明は、上記粗オキシメチレン共重合体に対し、ヒンダードフェノール系酸化防止剤を加えている。
本発明は、上記粗オキシメチレン共重合体に対し、エチレンメタクリル酸共重合樹脂若しくはエチレンアクリル酸共重合樹脂又それらの塩を加えている。エチレンメタクリル酸共重合樹脂若しくはエチレンアクリル酸共重合樹脂又はそれらの塩を加えることで、安定化処理を行うことなく、粗オキシメチレン共重合体に添加剤を加えた場合であっても、樹脂組成物を成形する際に生じるホルムアルデヒドの量を好適に抑えることができる。
アルカリ土類金属化合物としては、アルカリ土類金属(カルシウム、マグネシウム等)と有機カルボン酸との塩;CaO、MgO等の金属酸化物;CaCO3、MgCO3等の金属炭酸塩;アルカリ土類金属(カルシウム、マグネシウム等)とホウ酸やリン酸との塩等の金属無機酸塩等を例示できる。
本発明の粗ポリオキシメチレン共重合体に対し、さらに、公知の添加剤を使用することができる。
ポリオキシメチレン樹脂組成物の製造方法は特に限定されず、樹脂組成物の調製法として従来から知られた各種の方法により調製することができる。例えば、(1)組成物を構成する全成分を混合し、これを押出機に供給して溶融混練し、ペレット状の組成物を得る方法、(2)組成物を構成する成分の一部を押出機の主フィード口から、残余成分をサイドフィード口から供給して溶融混練し、ペレット状の組成物を得る方法、(3)押出し等により一旦組成の異なるペレットを調製し、そのペレットを混合して所定の組成に調整する方法等が挙げられる。
従来から、樹脂組成物を用いて樹脂成形品を形成する手法として、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、回転成形等が知られている。本発明に係る樹脂組成物を用いて成形品を形成する際、これら慣用の成形方法のいずれの方法によっても好適に成形品を形成できる。
はない。
二つの円が一部重なった断面形状を有するとともに、外側に熱(冷)媒を通すジャケットを備えたバレルと、このバレル内部の長手方向において、それぞれ撹拌及び推進用パドルを備えた2本の回転軸とを有する連続式混合反応機を用いて、以下のように重合反応を行った。
粗オキシメチレン共重合体をヘキサフルオロイソプロピルアルコール中に溶解し、N,O−ビス(トリメチルシリル)トリフルオロアセトアミドとピリジンを添加して反応させた後、風乾し、続いて40℃で減圧乾燥させることにより残留した溶媒及び未反応物を除去する。得られた反応物を重水素化へキサフルオロイソプロピルアルコールを溶媒として濃度5重量%に溶解して、溶液をNMR用サンプル管に充填し、室温で、NMRスペクトルを測定する(特開2001−11143号公報参照)。
ヘミアセタール末端基量(mmol/kg)及びホルミル末端基量(mmol/kg)は、各々対応するNMR吸収ピークに基づき算出する。
NMR装置:Bruker社製、AVANCE400型FT−NMR
測定条件:パルスフリップアングル30゜、積算繰り返し時間10sec、積算回数128回
粗オキシメチレン共重合体約1gを精秤し、水酸化カルシウム15mgと0.5体積%の水酸化アンモニウムを含む60体積%メタノール水溶液100mlとともに耐圧密閉容器に入れ、170℃で60分間加熱処理した後、冷却、開封して内溶液を取り出す。不安定な末端部分の分解によって生じ、溶液中に溶解したホルムアルデヒド量をJIS K0102、29.1項 アセチルアセトン吸光光度法にしたがって定量し、粗オキシメチレン共重合体に対する割合を重量%として算出する。
上記粗ポリオキシメチレン共重合体100重量部に対して、0.01重量部のトリエチレングリコール−ビス[3−(3−t−ブチル−5−メチル−4−ヒドロキシフェニル)プロピオネート]と2重量部のトリエチルアミン水溶液(0.72重量%濃度:トリエチルアミンは、粗ポリオキシメチレン共重合体1kg当たり3級アミン窒素に換算して1.4mmol)を添加して均一に混合する。
次いで、この混合物を前記の脱揮口付き2軸押出機に供給し、20mmHg(2.7kPa)のベント真空度、200℃のシリンダー温度、300秒の平均滞留時間で、揮発物を(ベント)脱揮口より除去しながら溶融混練し、ペレット状の安定化オキシメチレン共重合体を得た。
1.粗POM共重合体
上記<粗オキシメチレン共重合体の調製>によって得た粗オキシメチレン共重合体
2.安定化POM共重合体
上記<安定化オキシメチレン共重合体の調製>によって得た安定化オキシメチレン共重合体
3.ヒンダードフェノール系酸化防止剤
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ジャパン社製)
4.エチレンメタクリル酸共重合樹脂
エチレンメタクリル酸共重合樹脂(製品名:ニュクレルN1525,三井・デュポンポリケミカル社製)
5.エチレンアクリル酸共重合樹脂(製品名:プリマコール 3460、ダウケミカルカンパニー製)
6.エチレンメタクリル酸共重合体樹脂の亜鉛塩
7.アルカリ土類金属化合物
ステアリン酸カルシウム
酸化マグネシウム
8.摺動性改良剤
低分子量ポリエチレン(製品名:サンワックス161−P,三洋化成工業社製)
(押出条件)
シリンダー温度:170〜200℃
押出し量:18kg/hr(定量フィーダ使用)
回転数:120rpm
[溶融体からのホルムアルデヒド発生量]
5gのペレットを正確に秤量し、金属製容器中に200℃で5分間保持した後、容器内の雰囲気を蒸留水中に吸収させる。この水溶液のホルムアルデヒド量をJISK0102,29.(ホルムアルデヒドの項)に従って定量し、ペレットから発生するホルムアルデヒドガス量(ppm)を算出した。ホルムアルデヒドガス量が70ppm未満である場合を“○”とし、70ppm以上である場合を“×”とした。結果を表2に示す。
上記の組成物ペレットを用い、30mm単軸固化押出成形機を用いて、押出速度5mm/minで、φ140の丸棒を固化押出した。そして、得られた丸棒より、ISO 527−1 1B型に準じた試験片を切り出した。
ΔE=〔(L1−L0)2+(a1−a0)2+(b1−b0)2〕1/2
式中、L、a、bはそれぞれ色差計で計測される色の値であり、L、a、bの下付文字1は140℃のオーブンで20日間保持後の色相であることを、下付文字0はオーブンに入れる直前での色相を意味する。
Claims (2)
- 共重合終了後に重合触媒を失活させているが、不安定末端基を安定化していない粗オキシメチレン共重合体に対し、前記不安定末端基を安定化する安定化処理を行うことなく、ヒンダードフェノール系酸化防止剤と、エチレンメタクリル酸共重合樹脂若しくはエチレンアクリル酸共重合樹脂と、ステアリン酸カルシウムとを、一カ所以上の脱揮ベント口を有する押出機を用い、さらに、主フィード口から該脱揮ベント口までの任意の場所に水、低沸点アルコール類から選択される少なくとも一種を、該粗オキシメチレン共重合体100重量部に対して0.1重量部以上10重量部以下の範囲で供給して溶融混錬する、ポリオキシメチレン樹脂組成物を製造する方法。
- 前記粗オキシメチレン共重合体が、ヘミホルマール末端基量が1.2mmol/kgを超え、ホルミル末端基量が1.3mmol/kgを超え、不安定末端基量が0.56重量%を超える粗オキシメチレン共重合体である、ポリオキシメチレン樹脂組成物を製造する方法。
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