WO2006035619A1 - ポリアミド系導電性樹脂組成物、その製造方法、及びそれからなる燃料タンク用キャップ - Google Patents
ポリアミド系導電性樹脂組成物、その製造方法、及びそれからなる燃料タンク用キャップ Download PDFInfo
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- WO2006035619A1 WO2006035619A1 PCT/JP2005/017130 JP2005017130W WO2006035619A1 WO 2006035619 A1 WO2006035619 A1 WO 2006035619A1 JP 2005017130 W JP2005017130 W JP 2005017130W WO 2006035619 A1 WO2006035619 A1 WO 2006035619A1
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- Prior art keywords
- polyamide
- resin
- resin composition
- polyamide resin
- mass
- Prior art date
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- 229920006122 polyamide resin Polymers 0.000 title claims abstract description 85
- 239000011342 resin composition Substances 0.000 title claims abstract description 67
- 239000002828 fuel tank Substances 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 239000002245 particle Substances 0.000 claims abstract description 31
- 239000005977 Ethylene Substances 0.000 claims abstract description 28
- 239000011347 resin Substances 0.000 claims abstract description 26
- 229920005989 resin Polymers 0.000 claims abstract description 26
- 125000000524 functional group Chemical group 0.000 claims abstract description 24
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 22
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 22
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims abstract description 21
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000004711 α-olefin Substances 0.000 claims abstract description 11
- 125000003368 amide group Chemical group 0.000 claims abstract description 10
- 229920002647 polyamide Polymers 0.000 claims description 44
- 229920001577 copolymer Polymers 0.000 claims description 27
- 238000004898 kneading Methods 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 238000005299 abrasion Methods 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 2
- 229920013716 polyethylene resin Polymers 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 36
- 239000006229 carbon black Substances 0.000 description 29
- 235000019241 carbon black Nutrition 0.000 description 29
- 238000000034 method Methods 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 20
- 239000002994 raw material Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 6
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 6
- 239000008188 pellet Substances 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 5
- 230000000877 morphologic effect Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 229920001038 ethylene copolymer Polymers 0.000 description 3
- -1 ethylene monoolefin Chemical class 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 241000282320 Panthera leo Species 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- 125000004018 acid anhydride group Chemical group 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000000635 electron micrograph Methods 0.000 description 2
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- GUOSQNAUYHMCRU-UHFFFAOYSA-N 11-Aminoundecanoic acid Chemical compound NCCCCCCCCCCC(O)=O GUOSQNAUYHMCRU-UHFFFAOYSA-N 0.000 description 1
- AJYLWDRNNNHBEV-UHFFFAOYSA-N 2-hydrazinylbutanoic acid Chemical compound CCC(NN)C(O)=O AJYLWDRNNNHBEV-UHFFFAOYSA-N 0.000 description 1
- JMMZCWZIJXAGKW-UHFFFAOYSA-N 2-methylpent-2-ene Chemical compound CCC=C(C)C JMMZCWZIJXAGKW-UHFFFAOYSA-N 0.000 description 1
- 125000003504 2-oxazolinyl group Chemical group O1C(=NCC1)* 0.000 description 1
- 101710082795 30S ribosomal protein S17, chloroplastic Proteins 0.000 description 1
- SLXKOJJOQWFEFD-UHFFFAOYSA-N 6-aminohexanoic acid Chemical compound NCCCCCC(O)=O SLXKOJJOQWFEFD-UHFFFAOYSA-N 0.000 description 1
- VWPQCOZMXULHDM-UHFFFAOYSA-N 9-aminononanoic acid Chemical compound NCCCCCCCCC(O)=O VWPQCOZMXULHDM-UHFFFAOYSA-N 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- FDLQZKYLHJJBHD-UHFFFAOYSA-N [3-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=CC(CN)=C1 FDLQZKYLHJJBHD-UHFFFAOYSA-N 0.000 description 1
- OHBTULDTCSOWOY-UHFFFAOYSA-N [C].C=C Chemical compound [C].C=C OHBTULDTCSOWOY-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 229910001508 alkali metal halide Inorganic materials 0.000 description 1
- 150000008045 alkali metal halides Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 229960002684 aminocaproic acid Drugs 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 239000006231 channel black Substances 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 239000003484 crystal nucleating agent Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000004985 diamines Chemical class 0.000 description 1
- 150000001991 dicarboxylic acids Chemical class 0.000 description 1
- QFTYSVGGYOXFRQ-UHFFFAOYSA-N dodecane-1,12-diamine Chemical compound NCCCCCCCCCCCCN QFTYSVGGYOXFRQ-UHFFFAOYSA-N 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- VXNZUUAINFGPBY-UHFFFAOYSA-N ethyl ethylene Natural products CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 1
- 239000006232 furnace black Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- SXJVFQLYZSNZBT-UHFFFAOYSA-N nonane-1,9-diamine Chemical compound NCCCCCCCCCN SXJVFQLYZSNZBT-UHFFFAOYSA-N 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002530 phenolic antioxidant Substances 0.000 description 1
- IYDGMDWEHDFVQI-UHFFFAOYSA-N phosphoric acid;trioxotungsten Chemical compound O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.OP(O)(O)=O IYDGMDWEHDFVQI-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- KLNPWTHGTVSSEU-UHFFFAOYSA-N undecane-1,11-diamine Chemical compound NCCCCCCCCCCCN KLNPWTHGTVSSEU-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
-
- 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
- C08K3/02—Elements
- C08K3/04—Carbon
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
Definitions
- the present invention relates to a polyamide-based conductive resin composition comprising a polyamide resin, conductive carbon black and an olefin-based resin, and a method for producing the same.
- the present invention also relates to a fuel tank cap having excellent conductivity and excellent impact resistance and slidability.
- Polyamide resin exhibits excellent chemical resistance against organic solvents such as gasoline and alkaline liquids, and has high fluidity and heat resistance and creep resistance. It is used as a product.
- carbon black and other materials are added to provide conductivity, suppress the generation of static electricity, suppress charging, and provide a function that can be discharged in a relatively short time. Used as a part.
- the polyamide resin has a drawback that the dimensional change becomes large due to water absorption, and there is a problem that the impact strength is remarkably lowered due to an additive such as carbon black.
- carbon black It is well known to add carbon black to the polyamide resin in order to impart conductivity to the polyamide resin.
- increasing the amount of carbon black to improve the conductivity increases the fluidity and physical properties of the composition. Will be significantly impaired. Therefore, in order to improve fluidity and moldability, it has been proposed to blend carbon black, which imparts conductivity to the polyamide resin, and a modified ethylene copolymer that suppresses dimensional changes due to water absorption and improves impact resistance. (See Patent Document 1).
- the flowability and moldability are improved.
- the impact resistance of the polyamide resin composition is not sufficiently improved. Since the impact resistance is low, it is considered that the dispersed particle size of the modified ethylene copolymer dispersed in the polyamide resin composition is dispersed with a relatively large particle size. Therefore, it is the required performance as a fuel tank cap. I've come to achieve both electrical properties and impact strength.
- the soft modified ethylene copolymer is dispersed in the polyamide resin composition with a large dispersed particle size, it is originally a polyamide resin having excellent sliding properties. However, in these polyamide resin compositions, The dynamic characteristics are significantly impaired.
- Patent Document 1 JP-A-58-93756
- Patent Document 2 JP-A-11 180171
- the present invention was conceived in view of the above-described state of the prior art, and the object thereof is a conductive polyamide resin composition in which carbon black is blended with a polyamide resin, and the composition and morphology.
- a polyamide resin composition capable of providing a molded article having conductivity, high impact strength and excellent sliding characteristics by specifying one structure, a manufacturing method thereof, and a fuel tank cap comprising the same It is in.
- the present inventors have dispersed ethylene carbon in a polyamide resin and further have an ethylene monoolefin having a reactive functional group capable of reacting with the polyamide resin.
- the present invention is completed by finding that the above problems can be achieved by a conductive resin composition in which a copolymer is dispersed in a polyamide resin with an average particle size of 2 ⁇ m or less and a high-density polyethylene resin is blended. It came to.
- the present invention is the invention described in the following (1) to (7).
- the polyamide-based conductive resin composition has a volume specific resistance of a molded product obtained from the resin composition of 1 ⁇ 10 ” ⁇ ′cm or less and an Izod impact strength of 300 j / m or more.
- the fuel tank cap according to (5) which is characterized.
- a polyamide-based conductive resin composition is a taper of a molded product obtained from the resin composition.
- the conductive resin composition of the present invention blends carbon black with a polyamide resin to impart conductivity and improve moldability, and retains excellent impact resistance and sliding characteristics.
- the conductive resin composition having such good characteristics can be used well for automobile fuel system parts such as fuel tank caps, strainers, filters and valves. Therefore, it is important to contribute to the industry.
- the cap for a fuel tank of the present invention is not only excellent in chemical resistance of heat-resistant polyamide, but also has excellent impact resistance and sliding characteristics, and also has electrical conductivity, so that the human body or clothes are charged. Static electricity can be reliably discharged within a certain time.
- FIG. 1 is an electron micrograph of a polyamide-based conductive resin composition of the present invention.
- FIG. 2 is an electron micrograph of the polyamide-based conductive resin composition of Comparative Example 1.
- FIG. 3 is a cross-sectional explanatory view of an example of a general cap used in a fuel tank of an automobile or the like.
- FIG. 4 is a cross-sectional explanatory view of an example of a general cap used in a fuel tank of an automobile or the like.
- FIG. 5 is a cross-sectional explanatory view of an example of a general cap used for a fuel tank of an automobile or the like.
- the polyamide-based conductive resin composition of the present invention is a force that can be used in various fields, for example, a cap for a fuel tank. Its characteristic is mainly a constituent material, and the structure of the cap is not particularly limited.
- the (A) polyamide resin of the present invention has an acid amide bond (one CONH—) in the molecule, and specifically includes ⁇ —force prolatata, 6_aminocaproic acid, ⁇ _enantolactam, 7— A polymer or copolymer obtained from aminoaminobutanoic acid, 11-aminoundecanoic acid, 9-aminononanoic acid, pyrrolidone, ⁇ -piperidine, etc., or a blend thereof, hexamethylenediamine, nonamethylenediamine, Polymers or copolymers obtained by polycondensation of diamines such as undecamethylenediamine, dodecamethylenediamine, metaxylylenediamine, and dicarboxylic
- the number average molecular weight of these polyamide resins is preferably 7000 to 30000. If the number average molecular weight is less than 7000, the toughness is lowered, and if it exceeds 30000, the fluidity is lowered, which is preferable.
- the compounding amount of the polyamide resin is 95 to 40% by mass, more preferably 90 to 50% by mass. If the polyamide resin is less than 40% by mass, the morphology structure of the polyamide resin that should be the continuous phase in the microstructure of the molded article made of the polyamide-based conductive resin composition becomes unstable, which is not preferable.
- the (iii) conductive carbon black of the present invention is not particularly limited, and ketchen black, acetylene black, furnace black, channel black, and the like can be used. Among these, ketjen black is particularly preferable because it exhibits excellent conductivity with a small blending amount.
- the amount of the conductive carbon black is preferably 30 to 5% by mass depending on the intended degree of conductivity.
- These conductive carbon blacks need to be dispersed in an amount of 80% by mass or more of the blending amount in the polyamide resin forming the continuous phase of the polyamide-based conductive resin composition.
- the kneading process is extremely important, and the functional groups such as force rupoxyl groups and hydroxyl groups present on the surface of the carbon black particles are also important.
- the functional group on the surface of the bon black acts to increase the affinity with the polyamide resin, and it becomes easy to disperse in the continuous phase of the polyamide resin.
- the kneading conditions and the functional group concentration on the surface of the carbon black are not particularly limited.
- the molded article of the polyamide-based conductive resin composition 80% by mass or more of the blended amount of the carbon black is the continuous phase.
- a poly It is important that it is dispersed in the amide resin. Such dispersion of carbon black makes it possible to obtain a composition having excellent electrical conductivity with a volume resistivity of 1 ⁇ 10 11 ⁇ ′cm or less, and good physical properties such as impact strength and wear resistance.
- Examples of the ethylene monoolefin copolymer having a functional group capable of reacting with the terminal group and Z or main chain amide group of the (C) polyamide resin of the present invention include, for example, ethylene Z propylene copolymer, ethylene Z Propylene / Gen Copolymer, Ethylene Z Butene 1 Copolymer, Ethylene Z Otaten 1 Copolymer, Ethylene Z Hexene 1 Copolymer, Ethylene Z4 Methylpentene 1 Copolymer, Ethylene / Cycloolefin Copolymer Examples include coalescence, but are not limited to these.
- the blending amount of ethylene ⁇ -olefin copolymer is preferably 10 to 40% by mass. If the blending amount is less than 10% by mass, the impact strength of the polyamide-based conductive resin composition becomes low. On the other hand, if it exceeds 40% by mass, the elastic modulus and strength of the composition are remarkably lowered, and the wear resistance is also deteriorated.
- the functional group capable of reacting with the end group of the polyamide resin and / or the amide group of the main chain in the (C) ethylene ⁇ -olefin copolymer of the present invention is an amino group or a carboxyl group which is the end group of the polyamide resin.
- Group and / or a functional group capable of reacting with the amide group of the main chain include a carboxylic acid group, an acid anhydride group, an epoxy group, an oxazoline group, an amino group, and an isocyanate group. Of these, acid anhydride groups are preferred because of their highest reactivity.
- the amount of functional groups is a matter of course, and the stronger the reaction, the more the reaction with the polyamide resin proceeds, and the ethylene-fluorine copolymer is dispersed with a finer particle size in the continuous phase of the polyamide resin. Improves impact resistance.
- the method for producing an ethylene monoolefin copolymer having these functional groups is a method of reacting a compound having the above functional group in the step of producing the copolymer or a compound having a functional group and a pellet of the copolymer. Etc., and a method of mixing and reacting with an extruder or the like, but is not limited thereto.
- the (C) ethylene monoolefin copolymer of the present invention has a morphology structure in which particles having an average particle diameter of 2 xm or less are dispersed in a polyamide resin as a continuous phase.
- the above morphological structure can be obtained by reacting a polyamide resin and an ethylene-fluorine copolymer in the production process of the composition.
- Ethylene ⁇ in polyamide resin By finely dispersing the olefin copolymer with an average particle size of 2 ⁇ m or less, high impact properties with an Izod impact strength of 300 j / m or more can be obtained, and the excellent sliding properties of the polyamide resin can be reduced. A composition with a low content is obtained.
- the (D) high-density polyethylene of the present invention is polyethylene having a density of 0.96 or more, and other limitations are not particularly limited.
- the blending amount of the high density polyethylene is preferably: 10 to 10% by mass. If the blending amount is less than 1% by mass, the effect of improving the wear resistance is small, and if it exceeds 10% by mass, the strength of the composition is not preferable because the impact resistance is deteriorated.
- the ethylene ⁇ -olefin copolymer and the high-density polyethylene dispersed in the polyamide resin are of the same type of olefin resin and have good affinity. Therefore, the dispersibility in the composition is good.
- a polyamide-based conductive resin composition in which highly crystalline high-density polyethylene is finely dispersed exhibits excellent slidability and a Taber abrasion value of 25 mg or less.
- the morphology of the fuel tank cap comprising the polyamide-based conductive resin composition of the present invention is extremely important.
- the dispersion average particle diameter of the ethylene- ⁇ -olefin copolymer that forms a continuous phase in which the polyamide resin is a matrix and is finely dispersed by reacting with the polyamide resin is 2 ⁇ m or less.
- carbon black is dispersed in a polyamide resin, which is a continuous phase, in an amount of 80% by mass or more based on the functional groups present on the particle surface and the kneading conditions.
- High-density polyethylene can be uniformly dispersed due to its affinity with the finely dispersed ethylene- ⁇ -olefin copolymer.
- the volume specific resistance of the molded product obtained from the resin composition with such a morphological structure is 1 X 10 11 ⁇ -cm or less, the Izod impact strength is 300 jZm or more, and the Taber abrasion value is 25 mg or less.
- a fuel tank cap with excellent electrical conductivity, high impact resistance and sliding properties can be obtained.
- the volume specific resistance of the molded product obtained from the polyamide-based conductive resin composition is 1 ⁇ 10 9 ⁇ ′cm or less, and the izot impact strength is 500 jZm or more, Taber wear value is 22mg or less.
- the polyamide-based conductive resin composition of the present invention has a weather resistance used for ordinary polyamide-based resin compositions. Copper oxide and Z or alkali metal halides that improve the performance, phenolic antioxidants and phosphorous antioxidants, mold release agents, crystal nucleating agents, lubricants, pigments, dyes, etc. as light or heat stabilizers You may do it.
- the polyamide-based conductive resin composition used in the fuel tank cap of the present invention can form a stable morphology structure simply by mixing the components and kneading them with an extruder. First, it is recommended to use a special method of chaos.
- a specific method for producing the polyamide-based conductive resin composition of the present invention is as follows.
- melt kneader for example, a twin screw extruder, a pressure screwer, a single screw extruder, a melt reaction kettle, etc.
- a melt reaction kettle for example, a twin screw extruder, a pressure screwer, a single screw extruder, a melt reaction kettle, etc.
- conductive carbon black are melt-mixed and the conductive carbon black is uniformly dispersed in the polyamide resin
- C) the modified ethylene ⁇ -olefin copolymer and
- Add high density polyethylene and other additives as needed to melt and knead further.
- the production of the polyamide-based conductive resin composition of the present invention is not limited to a powerful specific blend and melt kneading method. As long as the above composition and morphology structure can be obtained, other blends and melt methods can be used. Can be used to produce the composition of the present invention. For example, in a vent type twin screw extruder with a supply port in the middle part, ( ⁇ ) polyamide resin and ( ⁇ ) conductive carbon black are put into the hopper, which is the main supply part, and melted and kneaded. (C) functional ethylene olefin copolymer and (D) high-density polyethylene are introduced from the vent port, which is the supply port in the middle part. Inventive compositions can be produced. These specific manufacturing methods are not limited to the methods described here. As described above, other manufacturing methods can be used as long as the conductive carbon black is finely dispersed in the polyamide resin. The composition of the present invention can be produced.
- Example 1 Example 1
- test piece was molded under the following conditions using an injection molding machine (Toshiba Machine Co., Ltd., IS80).
- volume resistivity 100mm X 100mm obtained by injection molding, 2mm thick plate with terminals connected at both ends perpendicular to the gate and measured with a digital multimeter (Advantest Co., Ltd., TR-6843) did.
- the measurement specimen was vacuum-dried at 70 ° C for 12 hours and then seasoned in an atmosphere of 20 ° C and 50% RH for 24 hours before measurement.
- Izod impact strength Measured according to ASTM D256 (notched).
- Taber abrasion Measured according to JIS K 7204 (Wear wheel CS17, load lOOOOg, rotation speed 1000 rotations).
- a frozen section was prepared from the center of a 100mm x 100mm, 2mm thick plate obtained by injection molding.
- a frozen section with a cross section perpendicular to the resin flow direction of the sample was prepared, dyed with 5% phosphotungstic acid aqueous solution for 30 minutes, and after carbon deposition, JEOL 3 ⁇ 4JEM2010 transmission type Take a picture by observing with an electron microscope at an acceleration voltage of 200 KV and a direct magnification of 5000 times.
- the average particle diameter is obtained by using the obtained photograph for an image analysis apparatus. In this apparatus, when the observed image of the domain is elliptical, the diameter converted to a sphere is used as the particle diameter.
- the location of carbon black exists in the continuous phase by counting the number of all carbon black particles present in the obtained photograph and the number of carbon black particles present in the continuous phase or dispersed phase with an image analyzer. The percentage% of the number of carbon black particles was mass%.
- the raw materials of the compositions used in the examples and comparative examples were as follows.
- (ii) The following two types of carbon black were used.
- Example: The manufacturing method of! ⁇ 3 is a twin-screw extruder (PCM30 manufactured by Ikekai Tekko Co., Ltd.) in which the raw materials are weighed and blended at the composition ratio shown in Table 1 in a one-step kneading process and set to a cylinder temperature of 260 ° C The mixture was melt kneaded into pellets. Next, each raw material is weighed and blended at the composition ratio shown in Table 1 in this two-stage kneading process and melt-mixed in a twin-screw extruder set at 260 ° C in the same way as in the first-stage kneading process. A resin composition was obtained.
- PCM30 manufactured by Ikekai Tekko Co., Ltd.
- Comparative Examples 1 and 2 a twin-screw extruder in which all the raw material components having the composition ratios shown in Table 1 are metered and blended without passing through the single-stage kneading process and set to 260 ° C. as described above.
- the polyamide-based conductive resin composition was obtained by melting and kneading with the above.
- A, ⁇ , C, and D indicate symbols of each composition component in the text.
- Example 1 the polyamide resin and carbon black are melted and kneaded in a one-step kneading process, carbon black is dispersed in a polyamide resin that has a morphological structure and becomes a continuous phase, and then a two-step kneading process.
- the morphology structure of the present invention could be obtained by melt-kneading the modified ethylene-polyolefin copolymer and high-density polyethylene.
- These polyamide resin compositions have high impact strength and excellent Taber abrasion value as well as good conductivity.
- Figure 1 shows a photo of an electron microscope showing these morphological structures. It can be seen that almost all of the carbon black is dispersed in the polyamide resin phase, and the modified ethylene ⁇ -olefin copolymer is uniformly dispersed with an average particle size of 2 ⁇ m or less.
- Example 1 and Comparative Example 1 have the same composition, but the Izod impact strength and the Taber wear value differ greatly.
- carbon black is dispersed in both the continuous phase of the polyamide resin and the dispersed phase of the ethylene ⁇ olefin copolymer, and the dispersed particle diameter of the ethylene a-olefin copolymer is also large. Because of this morphological structure, it seems that Izod impact strength and Taber wear value have deteriorated.
- Ethylene in the kneading process The functional group of the olefin copolymer and carbon black have some effect, and the activity of the functional group of the ethylene-aolefin copolymer has been lost. It is presumed that the impact strength and wear resistance of the polyamide resin composition were significantly deteriorated. As is apparent from the examples and comparative examples, the polyamide-based conductive resin composition having a morphology structure of the present invention can have excellent conductivity, high impact strength, and excellent Taber abrasion value.
- A, ⁇ , C, and D indicate symbols of each composition component in the text.
- the polyamide resin and carbon black are melted and mixed in a one-step kneading process, and the carbon black is dispersed in the polyamide resin that becomes a continuous phase, and then the modified ethylene
- the olefin copolymer and high-density polyethylene were melt-kneaded.
- high impact strength and excellent taper wear value as well as conductivity are obtained.
- Example 1 and Comparative Example 1 have the same composition, but the Izod impact strength greatly differs in the taper wear value.
- Comparative Example 1 ' all components were mixed at the same time, melted and kneaded.
- B Functional groups and functional groups on the conductive carbon black particle surface were added.
- C Reaction with the polyamide resin that should be reacted because the functional group attached to the ethylene-monoolefin copolymer was lost due to the reaction with the ethylene-monoolefin copolymer during melting and kneading. It is presumed that the impact strength and wear resistance of the composition were significantly deteriorated as the ratio decreased.
- Comparative Example 2 ′ since (D) high-density polyethylene is not blended, the taper wear value is significantly reduced.
- Comparative Example 3 ′ if the amount of the (C) ethylene-fluorine copolymer having a functional group is decreased, the impact strength of the composition is naturally reduced.
- the polyamide-based conductive resin composition produced by the production method of the present invention has excellent conductivity, high impact strength, and excellent Taber abrasion value. it can.
- the polyamide resin composition of the present invention has excellent conductivity and excellent impact resistance and sliding properties. Conductive resin compositions with such good characteristics can be used in a wide range of fields as fuel system parts for automobiles, such as fuel tank caps, strainers, filters, and valves, contributing to the industry. It is great to do.
- the fuel tank cap of the present invention is excellent in mechanical properties such as Izod impact strength and Taber wear, and molding processability, and can reliably discharge static electricity charged on the human body or clothes within a certain time. .
Abstract
Description
Claims
Priority Applications (2)
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US11/632,055 US7544313B2 (en) | 2004-09-29 | 2005-09-16 | Cap for fuel tank comprising electrically conductive resin composition of a polyamide type |
CN2005800296279A CN101010384B (zh) | 2004-09-29 | 2005-09-16 | 包含聚酰胺类导电树脂组合物的燃料箱盖 |
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JP2004-286478 | 2004-09-30 | ||
JP2004286478 | 2004-09-30 |
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CN101010384B (zh) | 2010-05-05 |
US20080073620A1 (en) | 2008-03-27 |
US7544313B2 (en) | 2009-06-09 |
CN101010384A (zh) | 2007-08-01 |
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