US20140306142A1 - Polyamide resin composition for sound insulation - Google Patents
Polyamide resin composition for sound insulation Download PDFInfo
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- US20140306142A1 US20140306142A1 US13/946,230 US201313946230A US2014306142A1 US 20140306142 A1 US20140306142 A1 US 20140306142A1 US 201313946230 A US201313946230 A US 201313946230A US 2014306142 A1 US2014306142 A1 US 2014306142A1
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- polyamide
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- 238000009413 insulation Methods 0.000 title claims abstract description 33
- 229920006122 polyamide resin Polymers 0.000 title claims abstract description 26
- 239000011342 resin composition Substances 0.000 title claims abstract description 20
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 53
- 239000003365 glass fiber Substances 0.000 claims abstract description 45
- 239000000203 mixture Substances 0.000 claims abstract description 44
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 34
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 34
- 229920002292 Nylon 6 Polymers 0.000 claims abstract description 21
- 239000003381 stabilizer Substances 0.000 claims abstract description 18
- 239000000314 lubricant Substances 0.000 claims abstract description 16
- 239000011347 resin Substances 0.000 claims abstract description 16
- 229920005989 resin Polymers 0.000 claims abstract description 16
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 9
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 8
- 239000007822 coupling agent Substances 0.000 claims description 8
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 8
- 229910000077 silane Inorganic materials 0.000 claims description 8
- 239000004952 Polyamide Substances 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 229920002302 Nylon 6,6 Polymers 0.000 abstract description 17
- 238000002347 injection Methods 0.000 abstract description 6
- 239000007924 injection Substances 0.000 abstract description 6
- 230000006866 deterioration Effects 0.000 abstract description 2
- 239000013585 weight reducing agent Substances 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000005192 partition Methods 0.000 description 22
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 18
- 230000005484 gravity Effects 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000001746 injection moulding Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000010456 wollastonite Substances 0.000 description 3
- 229910052882 wollastonite Inorganic materials 0.000 description 3
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- FJDLQLIRZFKEKJ-UHFFFAOYSA-N 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanamide Chemical compound CC(C)(C)C1=CC(CCC(N)=O)=CC(C(C)(C)C)=C1O FJDLQLIRZFKEKJ-UHFFFAOYSA-N 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical group [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical group CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012733 comparative method Methods 0.000 description 1
- LSXDOTMGLUJQCM-UHFFFAOYSA-M copper(i) iodide Chemical group I[Cu] LSXDOTMGLUJQCM-UHFFFAOYSA-M 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
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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
- 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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/24—Coatings containing organic materials
- C03C25/40—Organo-silicon compounds
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/42—Coatings containing inorganic materials
-
- 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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
-
- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
-
- 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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/004—Additives being defined by their length
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Definitions
- the present invention relates to a polyamide resin composition for sound insulation that effectively insulates engine sounds and noise generated in an engine room of a vehicle, and more specifically, to a polyamide resin composition for sound insulation which includes polyamide 66 or polyamide 6 resins, glass fibers and barium sulfates.
- a partition of an engine room of a vehicle is a wall disposed between the engine room and a dash board to insulate transfer of noise generated in the engine room into an interior of the vehicle.
- the partition thus, improves the comfort level for passengers in the vehicle.
- a partition of an engine room of a vehicle is conventionally made of a steel material.
- the weight of such a steel partition is excessively large, thus reducing fuel efficiency and ride comfort of the vehicle. Further, it is difficult to manufacture a complicated form from such a steel material.
- a composition including polypropylene, a glass fiber, and iron oxide (Fe 2 O 3 ) having high specific gravity has been used as a vehicle partition.
- Such a composition is more easily processed than metal, is lightweight, can be provided in various and simple designs and design effects, and is less expensive due to its high productivity.
- it provides inadequate mechanical stiffness, heat resistance and injection moldability.
- a filler such as iron oxide (Fe 2 O 3 , specific gravity: 4 to 4.5) and barium sulfate (BaSO 4 , specific gravity: 4 to 4.5) is commonly used to increase the weight of a material.
- Iron oxide and barium sulfate have a higher specific gravity as compared to talc or wollastonite (specific gravity: 2.6 to 2.9). Thus, these fillers are extensively used because a sound insulation property can be improved by increasing the specific gravity of a plastic material.
- Moh's hardness of iron oxide is about 7, which is significantly high.
- screws and molds of injection molding machines are easily abraded during extrusion and molding of products which include iron oxide due to the high hardness provided thereby. As such, operation and maintenance of the injection molding machine for high hardness materials is costly.
- Korean Unexamined Patent Application Publication No. 2010-41588 describes a polyamide resin composition for a vehicle engine cover, including a polyamide 6 resin, a glass fiber, carbon nanotube and a heat resistant stabilizer.
- the composition is problematic in that a sound insulation property is not sufficient even though heat resistance is excellent.
- Japanese Unexamined Patent Application Publication No. 1999-43602 describes a polyamide resin composition including a polyamide resin, a glass fiber and barium sulfate.
- the content of barium sulfate is low, and thus there is a disadvantage in that a sufficient sound insulation property is not provided.
- the present invention provides a polyamide resin composition for sound insulation, which includes a polyamide 66 or polyamide 6 resin, a glass fiber for improving mechanical and heat resistance properties of the composition, and barium sulfate for improving a sound insulation property of the composition.
- the composition can further include one or more of an antioxidant for preventing deterioration of the composition, a heat resistant stabilizer for improving heat resistance, and a lubricant for reducing friction to improve moldability.
- the composition of the present invention thus, provides excellent mechanical properties, heat resistance, noise and vibration insulation performance, degree of freedom in design, and injection moldability.
- the present invention further provides a partition for a vehicle fabricated from the present composition, wherein the partition effectively insulates engine sound generated in an engine room, and thus provides a more comfortable driving environment.
- the present invention provides a polyamide resin composition for sound insulation comprising about 15 to 20 parts by weight of a glass fiber, and about 45 to 50 parts by weight of barium sulfate, based on 100 parts by weight of a polyamide 66 or polyamide 6 resin.
- the glass fiber can be any conventional glass fibers that provide the desired mechanical and heat resistance properties, and according to preferred embodiments, the glass fiber has an average length of about 1 mm to 5 mm and an average diameter of a cross section of about 10 to 13 ⁇ m.
- the glass fiber is coated with a silane-based coupling agent.
- a weight of the silane-based coupling agent is about 0.1 to 0.3 wt % based on a total weight of the glass fiber.
- an average diameter of barium sulfate particles is about 20 to 30 ⁇ m.
- the polyamide resin composition for sound insulation further includes one or more of about 0.3 to 0.5 parts by weight of an antioxidant, about 0.3 to 0.5 parts by weight of a heat resistant stabilizer, and/or about 0.2 to 0.4 parts by weight of a lubricant.
- the antioxidant is a mixture of a phenol-based antioxidant and a phosphite-based antioxidant.
- the present invention having the above-described constitution of a polyamide 66 or polyamide 6 resin, a glass fiber and barium sulfate (BaSO 4 ) having high specific gravity, provides excellent mechanical properties, heat resistance and noise and vibration insulation performance.
- the present invention provides a partition for a vehicle fabricated of the composition.
- a partition provides a weight reduction effect of about 2.6 kg per one vehicle as compared to a conventional partition made of iron.
- injection molding can be performed to implement a complicated shape using the present composition, there is an effect in that the excellent degree of freedom in design can be ensured in a narrow space in an engine room.
- the composition utilizes a barium sulfate having Moh's hardness of about 3.
- a barium sulfate having Moh's hardness of about 3.
- the use of such a barium sulfate provides excellent injection moldability, as compared to a conventional polypropylene composition including iron oxide having Moh's hardness of 7.
- FIG. 1 is a mimetic diagram showing a partition of an engine room of a vehicle
- FIG. 2 is a graph showing the magnitude of noise insulated at a left of a driver's seat for each frequency
- FIG. 3 is a graph showing the magnitude of noise insulated at a right of the driver's seat for each frequency
- FIG. 4 is a graph showing the magnitude of noise insulated at a left of a front passenger seat for each frequency
- FIG. 5 is a graph showing the magnitude of noise insulated at a back seat for each frequency
- FIG. 6 is a graph showing the magnitude of noise insulated at a left of a VIP seat of the back seat for each frequency
- FIG. 7 is a graph showing the magnitude of noise insulated at a right of the VIP seat of the back seat for each frequency
- FIG. 8 is a graph showing the magnitude of noise insulated directly behind a left engine room for each frequency.
- FIG. 9 is a graph showing the magnitude of noise insulated directly behind a right engine room for each frequency.
- vehicle or “vehicular” or other similar term as used herein is inclusive of motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g. fuels derived from resources other than petroleum).
- a hybrid vehicle is a vehicle that has two or more sources of power, for example both gasoline-powered and electric-powered vehicles.
- the term “about” is understood as within a range of normal tolerance in the art, for example within 2 standard deviations of the mean. “About” can be understood as within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05%, or 0.01% of the stated value. Unless otherwise clear from the context, all numerical values provided herein are modified by the term “about”.
- the present invention relates to polyamide resin composition for sound insulation having excellent mechanical stiffness, heat resistance and noise insulation function. More specifically, the present invention relates to polyamide resin composition which includes a polyamide 66 or polyamide 6 resin, a glass fiber and barium sulfate (BaSO 4 ) having high specific gravity in order to increase mechanical stiffness, heat resistance and injection moldability. According to preferred embodiments, the composition further includes one or more of an antioxidant, a heat resistant stabilizer and/or a lubricant.
- the content of the glass fiber is about 15 to 20 parts by weight
- the content of barium sulfate is about 45 to 50 parts by weight
- the content of the antioxidant is about 0.3 to 0.5 parts by weight
- the content of the heat resistant stabilizer is about 0.3 to 0.5 parts by weight
- the content of the lubricant is about 0.2 to 0.4 parts by weight, based on 100 parts by weight of the polyamide 66 or polyamide 6 resin.
- any polyamide resin known in the art may be used as the polyamide resin component. However, it is preferable that polyamide 66 or polyamide 6 resin is used. As described herein, the polyamide 66 or polyamide 6 resin is a material that is a basis of the present invention.
- the polyamide resin is a material having excellent general mechanical and heat resistance properties such as tensile strength, flexural strength, flexural modulus, heat resistance, chemical resistance, and moldability. As such, the polyamide resin is extensively used in various fields such as vehicles, airplanes, space and sports.
- the mechanical and heat resistance properties may be easily improved by including a reinforcing agent, such as a glass fiber, in the polyamide 66 or polyamide 6 resin.
- a reinforcing agent such as a glass fiber
- the glass fiber functions to improve the mechanical properties of the polyamide resin composition, such as tensile strength, flexural strength, flexural modulus and impact strength, as well as the heat resistance properties, such as a heat distortion temperature (HDT). Any glass fiber known in the art may be used as the glass fiber.
- the surface of the glass fiber is coated with a silane-based coupling agent in order to increase an interface adhesion property between the polyamide resin and the glass fiber.
- the content of the glass fiber is about 15 to 20 parts by weight based on 100 parts by weight of polyamide 66 or polyamide 6.
- the content of the glass fiber is less than about 15 parts by weight, the mechanical and heat resistance properties of the composition may be reduced.
- the content is more than about 20 parts by weight, fluidity of the composition may be reduced to deteriorate the appearance quality of molded products.
- an average diameter of a cross section of the glass fiber is about 10 to 13 ⁇ m.
- the average diameter of the cross section is less than about 10 ⁇ m, since a breakage ratio of the glass fiber is high, the mechanical property of the composition may be reduced.
- the average diameter is more than about 13 ⁇ m, the appearance quality of the composition may be reduced.
- any conventional glass fiber may be used in the present invention.
- the glass fiber be a long glass fiber such as one having an average length of about 1 mm to 5 mm in order to improve impact strength and a dimensional stability effect of the composition.
- the average length of the glass fiber is less than about 1 mm, the mechanical and heat resistance properties of the composition may be reduced and a distortion phenomenon may occur in large-sized products.
- the average length is more than about 5 mm, a significant difference occurs between glass fiber alignment on the surface of the composition and the glass fiber alignment in the composition. This results in a difference in physical properties between the surface and the inside of the composition.
- the content of the silane-based coupling agent is about 0.1 to 0.3 wt % based on the total weight of the glass fiber.
- the content of the silane-based coupling agent is less than about 0.1 wt %, mechanical and heat resistance properties of the composition may be reduced.
- the content is more than about 0.3 wt %, moldability may be reduced due to an increase in viscosity of the composition.
- Barium sulfate (BaSO 4 ) is an inorganic filler that improves moldability and dimensional stability of the present composition and that further increases specific gravity of the composition, thus improving a sound insulation property. Since the sound insulation property is generally increased in proportion to an increase in specific gravity of the material, it is preferable to use a barium sulfate having a high specific gravity in order to improve the sound insulation property.
- Barium sulfate has Moh's hardness of about 3, which is smaller than the Moh's hardness of about 7 for iron oxide used as a conventional inorganic filler. As such, friction of screws of injection molding machines and molds is reduced during an extrusion process and molding of the present composition to improve moldability.
- the content of barium sulfate is about 45 to 50 parts by weight based on 100 parts by weight of polyamide 66 or polyamide 6.
- the specific gravity of the composition may be reduced to reduce the sound insulation property.
- appearance quality and physical properties may be reduced.
- the average diameter of the particles of barium sulfate is about 20 to 30 ⁇ m. In the case where the average diameter is less than about 20 ⁇ m, moldability and dimensional stability may be reduced. On the other hand, in the case where the average diameter is more than about 30 ⁇ m, a surface area of barium sulfate is reduced, and effective sound insulation property cannot be obtained.
- the antioxidant functions to suppress a reaction of oxidative degradation during extrusion and injection processes of the composition. Any conventional antioxidant may be used in the present invention, but it is preferable to use a mixture of a phenol-based antioxidant and a phosphate-based antioxidant.
- the phenol-based antioxidant is reacted with radicals generated in plastics to discharge hydrogen in the phenol-based antioxidant, thereby stabilizing the radicals, and the antioxidant is converted into the radicals and remains in a stable form through a resonance effect or re-arrangement of electrons.
- phenol-based antioxidant Any conventional phenol-based antioxidant may be used in the present invention, but it is preferable that the phenol-based antioxidant is N,N′-1,6-hexanediylbis(3,5-bis(1,1-dimethylethyl)-4-hydroxybenzene-propaneamide or bis-(3,3-bis-(4′-hydroxy-3′-tetrabutylphenyl)butanoic acid)-glycolester.
- the phosphite-based antioxidant performs a function of a hydroperoxide decomposer to prevent the radicals from being generated. Further, if the phosphite-based antioxidant is used together with the phenol-based antioxidant, a synergistic effect can be expected and stability of cross-linked plastics and stability to UV are increased.
- any conventional phosphite-based antioxidant may be used in the present invention, but it is preferable that the phosphite-based antioxidant is tris-(2,4-di-tertiary-butylphenyl)-phosphite or tetrakis(2,4-di-tertiary-butylphenyl)-4,4′-biphenylene diphosphite.
- the composition contains about 0.3 to 0.5 parts by weight and more preferably 0.4 parts by weight of the mixed antioxidant, based on 100 parts by weight of polyamide 66 or polyamide 6.
- the content of the antioxidant is less than about 0.3 parts by weight, the antioxidant cannot sufficiently prevent oxidation, and where the content is more than about 0.5 parts by weight, physical properties and the quality of appearance may be reduced.
- the heat resistant stabilizer functions to improve heat resistance of the composition, and any matter known in the art may be used as the heat resistant stabilizer.
- the heat resistant stabilizer is an iodine-based heat resistant stabilizer.
- the heat resistant stabilizer is copper iodide (CuI).
- the content of the heat resistant stabilizer is preferably about 0.3 to 0.5 parts by weight and more preferably about 0.2 parts by weight based on 100 parts by weight of the polyamide 66 or polyamide 6 resin.
- the content of the heat resistant stabilizer is less than about 0.3 parts by weight, the heat resistance properties, such as the heat distortion temperature, of the composition may be reduced.
- the content is more than about 0.5 parts by weight, the mechanical properties and the appearance quality may be reduced.
- the lubricant functions to adjust friction between the compositions or between the composition and a metal when the composition is heated and molded to improve fluidity and a release property to thereby facilitate processing.
- Any conventional lubricant may be used in the present invention, and according to preferred embodiments, an olefine-based lubricant, more preferably ethylene bisstearamide, is used.
- the content of the lubricant is preferably about 0.2 to 0.4 parts by weight and more preferably about 0.2 parts by weight based on 100 parts by weight of the polyamide 66 or polyamide 6 resin.
- the content of the lubricant is less than about 0.2 parts by weight, the fluidity and the release property may be reduced, and thus it may be difficult to mold large-sized products.
- the lubricant content is more than about 0.4 parts by weight, mechanical properties and weld strength may be reduced.
- the present invention provides excellent sounds insulation properties and may be applied in various ways so as to provide sound insulation.
- the present invention is applied to a partition of an engine room of a vehicle.
- the present invention relates to a method of manufacturing a polyamide resin composition for sound insulation.
- the polyamide resin composition for sound insulation may be appropriately manufactured by a person of ordinary skill in the art with reference to known technologies. Specifically, it is preferable that the polyamide resin composition for sound insulation is manufactured so as to include about 15 to 20 parts by weight of a glass fiber, preferably a glass fiber coated with a silane-based coupling agent, about 45 to 50 parts by weight of barium sulfate, about 0.3 to 0.5 parts by weight of antioxidant, preferably a mixture of a phenol-based antioxidant and a phosphite-based antioxidant, about 0.3 to 0.5 parts by weight of the heat resistant stabilizer and about 0.2 to 0.4 parts by weight of the lubricant, based on 100 parts by weight of the polyamide 66 or polyamide 6 resin.
- FIG. 1 is a mimetic diagram showing the partition 100 of the engine room of the vehicle which was formed from the polyamide resin compositions of the Examples and Comparative Examples.
- the components and contents of the Examples and Comparative Examples are shown in the following Table 1. Thereafter, physical properties thereof were compared, and set forth in the following Table 2.
- Table 1 is a table comparing the components and the contents of the Examples and the Comparative Examples.
- the antioxidant, the heat resistant stabilizer and the lubricant of the above-described Table 1 were included in the same content in the Examples and the Comparative Examples, and polypropylene was only included in Comparative Example 1. Further, barium sulfate for improving the sound insulation property was only included in the Examples (in accordance with the present invention), while iron oxide and wollastonite were instead included in the Comparative Examples (not in accordance with the present invention).
- Table 2 is a table in which physical and heat resistance properties of the Examples and the Comparative Examples are numerically represented through the specific tests, and compared.
- the specific gravity was measured according to ASTM D792, and the tensile strength was measured according to ASTM D638 under the condition of the temperature of 23 ⁇ 2° C., relative humidity of 50%, atmospheric pressure, and a speed of 5 mm/min.
- the flexural strength and the flexural modulus were measured according to ASTM D790, and the cross head speed was measured under the condition of a speed of 5 mm/min.
- the impact strength was measured according to ASTM D256 as a value obtained by dividing energy when the specimen was broken by unit thickness by an Izod notch method at 23 ⁇ 2° C.
- the heat distortion temperature was obtained by measuring the temperature in the case where the specimen was distorted when the ambient temperature was increased at the rate of 2° C./min under the condition of a load of 1.82 MPa on the specimen according to ASTM D648.
- the specific gravity was highest in Comparative Example 1, but the tensile strength, the flexural strength, the flexural modulus and the impact strength were superior in the Examples.
- one of the most important properties of a composition applied to the engine room of the vehicle is heat resistance. Based on the result that the heat resistance of the Examples was much better than the heat resistance of the Comparative Examples, it was demonstrated that the Examples were better than the Comparative Examples in terms of the mechanical and heat resistance properties. Further, it was demonstrated that in the case of Example 3 to which the long glass fiber was applied, all properties were better than Example 1 to which the short glass fiber was applied.
- Table 3 is a table in which sound insulation performances of the Examples are compared.
- Example 3 in the case of Example 3 to which the partition was applied, the measured numerical value was higher than that of the case where the partition was not applied, which means that a large amount of noise is insulated by the higher numerical value. Accordingly, it was confirmed that in the case of Example 3 to which the partition was applied, the measured noise was reduced at all positions in the vehicle and right behind the engine room as compared to the case where the partition was not applied.
- FIG. 2 is a graph showing the magnitude of noise insulated at a left of a driver's seat for each frequency
- FIG. 3 is a graph showing the magnitude of noise insulated at a right of the driver's seat for each frequency
- FIG. 4 is a graph showing the magnitude of noise insulated at a left of a front passenger seat for each frequency
- FIG. 5 is a graph showing the magnitude of noise insulated at a back seat for each frequency
- FIG. 6 is a graph showing the magnitude of noise insulated at a left of a VIP seat of the back seat for each frequency
- FIG. 7 is a graph showing the magnitude of noise insulated at a right of the VIP seat of the back seat for each frequency
- FIG. 8 is a graph showing the magnitude of noise insulated directly behind a left engine room for each frequency
- FIG. 9 is a graph showing the magnitude of noise insulated directly behind a right engine room for each frequency.
- Example 3 (which was in accordance with the present invention) was positioned between the engine room and the dash board, and thus the noise flowing from the engine room to the position of the driver's seat was reduced by an average of 8 to 8.8 dB.
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Abstract
Disclosed is a polyamide resin composition for sound insulation, which includes a polyamide 66 or polyamide 6 resin, a glass fiber for improving mechanical and heat resistance properties of the composition, and barium sulfate for improving a sound insulation property of the composition. The polyamide resin composition can further include one or more of an antioxidant for preventing deterioration of the composition, a heat resistant stabilizer for improving heat resistance, and a lubricant for reducing friction to improve moldability. The polyamide resin composition thus has excellent mechanical properties, heat resistance, noise and vibration insulation performance, and can further be injection molded to thereby provide weight reduction and allow for the formation of complicated shapes.
Description
- The present application claims priority to Korean Patent Application No. 10-2013-0040585, filed on Apr. 12, 2013, the entire contents of which is incorporated herein for all purposes by this reference.
- (a) Technical Field
- The present invention relates to a polyamide resin composition for sound insulation that effectively insulates engine sounds and noise generated in an engine room of a vehicle, and more specifically, to a polyamide resin composition for sound insulation which includes polyamide 66 or polyamide 6 resins, glass fibers and barium sulfates.
- (b) Background Art
- A partition of an engine room of a vehicle is a wall disposed between the engine room and a dash board to insulate transfer of noise generated in the engine room into an interior of the vehicle. The partition, thus, improves the comfort level for passengers in the vehicle.
- A partition of an engine room of a vehicle is conventionally made of a steel material. However, the weight of such a steel partition is excessively large, thus reducing fuel efficiency and ride comfort of the vehicle. Further, it is difficult to manufacture a complicated form from such a steel material.
- In attempt to solve the above-described problems, a composition including polypropylene, a glass fiber, and iron oxide (Fe2O3) having high specific gravity has been used as a vehicle partition. Such a composition, is more easily processed than metal, is lightweight, can be provided in various and simple designs and design effects, and is less expensive due to its high productivity. However, it provides inadequate mechanical stiffness, heat resistance and injection moldability.
- Generally, since a high-filling material having high specific gravity is useful for insulating noise and vibration, a filler such as iron oxide (Fe2O3, specific gravity: 4 to 4.5) and barium sulfate (BaSO4, specific gravity: 4 to 4.5) is commonly used to increase the weight of a material.
- Iron oxide and barium sulfate have a higher specific gravity as compared to talc or wollastonite (specific gravity: 2.6 to 2.9). Thus, these fillers are extensively used because a sound insulation property can be improved by increasing the specific gravity of a plastic material.
- However, Moh's hardness of iron oxide is about 7, which is significantly high. Thus, screws and molds of injection molding machines are easily abraded during extrusion and molding of products which include iron oxide due to the high hardness provided thereby. As such, operation and maintenance of the injection molding machine for high hardness materials is costly.
- Korean Unexamined Patent Application Publication No. 2010-41588 describes a polyamide resin composition for a vehicle engine cover, including a polyamide 6 resin, a glass fiber, carbon nanotube and a heat resistant stabilizer. However, the composition is problematic in that a sound insulation property is not sufficient even though heat resistance is excellent. Further, Japanese Unexamined Patent Application Publication No. 1999-43602 describes a polyamide resin composition including a polyamide resin, a glass fiber and barium sulfate. However, the content of barium sulfate is low, and thus there is a disadvantage in that a sufficient sound insulation property is not provided.
- The present invention provides a polyamide resin composition for sound insulation, which includes a polyamide 66 or polyamide 6 resin, a glass fiber for improving mechanical and heat resistance properties of the composition, and barium sulfate for improving a sound insulation property of the composition. According to various embodiments, the composition can further include one or more of an antioxidant for preventing deterioration of the composition, a heat resistant stabilizer for improving heat resistance, and a lubricant for reducing friction to improve moldability. The composition of the present invention, thus, provides excellent mechanical properties, heat resistance, noise and vibration insulation performance, degree of freedom in design, and injection moldability. The present invention further provides a partition for a vehicle fabricated from the present composition, wherein the partition effectively insulates engine sound generated in an engine room, and thus provides a more comfortable driving environment.
- According to one aspect, the present invention provides a polyamide resin composition for sound insulation comprising about 15 to 20 parts by weight of a glass fiber, and about 45 to 50 parts by weight of barium sulfate, based on 100 parts by weight of a polyamide 66 or polyamide 6 resin.
- The glass fiber can be any conventional glass fibers that provide the desired mechanical and heat resistance properties, and according to preferred embodiments, the glass fiber has an average length of about 1 mm to 5 mm and an average diameter of a cross section of about 10 to 13 μm.
- According to various embodiments, the glass fiber is coated with a silane-based coupling agent. Preferably, a weight of the silane-based coupling agent is about 0.1 to 0.3 wt % based on a total weight of the glass fiber.
- According to various embodiments, an average diameter of barium sulfate particles is about 20 to 30 μm.
- According to various embodiments, the polyamide resin composition for sound insulation further includes one or more of about 0.3 to 0.5 parts by weight of an antioxidant, about 0.3 to 0.5 parts by weight of a heat resistant stabilizer, and/or about 0.2 to 0.4 parts by weight of a lubricant.
- According to preferred embodiment, the antioxidant is a mixture of a phenol-based antioxidant and a phosphite-based antioxidant.
- The present invention having the above-described constitution of a polyamide 66 or polyamide 6 resin, a glass fiber and barium sulfate (BaSO4) having high specific gravity, provides excellent mechanical properties, heat resistance and noise and vibration insulation performance.
- According to a further aspect, the present invention provides a partition for a vehicle fabricated of the composition. According to various embodiments, such a partition provides a weight reduction effect of about 2.6 kg per one vehicle as compared to a conventional partition made of iron. Further, since injection molding can be performed to implement a complicated shape using the present composition, there is an effect in that the excellent degree of freedom in design can be ensured in a narrow space in an engine room.
- According to various embodiments, the composition utilizes a barium sulfate having Moh's hardness of about 3. The use of such a barium sulfate provides excellent injection moldability, as compared to a conventional polypropylene composition including iron oxide having Moh's hardness of 7.
- Other aspects and exemplary embodiments of the invention are discussed infra.
- The above and other features of the present invention will now be described in detail with reference to certain exemplary embodiments thereof illustrated the accompanying drawings which are given hereinbelow by way of illustration only, and thus are not limitative of the present invention, and wherein:
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FIG. 1 is a mimetic diagram showing a partition of an engine room of a vehicle; -
FIG. 2 is a graph showing the magnitude of noise insulated at a left of a driver's seat for each frequency; -
FIG. 3 is a graph showing the magnitude of noise insulated at a right of the driver's seat for each frequency; -
FIG. 4 is a graph showing the magnitude of noise insulated at a left of a front passenger seat for each frequency; -
FIG. 5 is a graph showing the magnitude of noise insulated at a back seat for each frequency; -
FIG. 6 is a graph showing the magnitude of noise insulated at a left of a VIP seat of the back seat for each frequency; -
FIG. 7 is a graph showing the magnitude of noise insulated at a right of the VIP seat of the back seat for each frequency; -
FIG. 8 is a graph showing the magnitude of noise insulated directly behind a left engine room for each frequency; and -
FIG. 9 is a graph showing the magnitude of noise insulated directly behind a right engine room for each frequency. - It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various preferred features illustrative of the basic principles of the invention. The specific design features of the present invention as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment.
- In the figures, reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing.
- The terms and the words used in the specification and claims should not be construed with common or dictionary meanings, but construed as meanings and conception coinciding the spirit of the invention based on a principle that the inventors can appropriately define the concept of the terms to explain the invention in the optimum method.
- It is understood that the term “vehicle” or “vehicular” or other similar term as used herein is inclusive of motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g. fuels derived from resources other than petroleum). As referred to herein, a hybrid vehicle is a vehicle that has two or more sources of power, for example both gasoline-powered and electric-powered vehicles.
- The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a,” “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
- Unless specifically stated or obvious from context, as used herein, the term “about” is understood as within a range of normal tolerance in the art, for example within 2 standard deviations of the mean. “About” can be understood as within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05%, or 0.01% of the stated value. Unless otherwise clear from the context, all numerical values provided herein are modified by the term “about”.
- Hereinafter, the present invention will be described in detail.
- The present invention relates to polyamide resin composition for sound insulation having excellent mechanical stiffness, heat resistance and noise insulation function. More specifically, the present invention relates to polyamide resin composition which includes a polyamide 66 or polyamide 6 resin, a glass fiber and barium sulfate (BaSO4) having high specific gravity in order to increase mechanical stiffness, heat resistance and injection moldability. According to preferred embodiments, the composition further includes one or more of an antioxidant, a heat resistant stabilizer and/or a lubricant.
- To be more specific, it is preferable that the content of the glass fiber is about 15 to 20 parts by weight, the content of barium sulfate is about 45 to 50 parts by weight, the content of the antioxidant is about 0.3 to 0.5 parts by weight, the content of the heat resistant stabilizer is about 0.3 to 0.5 parts by weight and the content of the lubricant is about 0.2 to 0.4 parts by weight, based on 100 parts by weight of the polyamide 66 or polyamide 6 resin.
- Hereinafter, constitution components of the present invention and the contents thereof will be described in detail.
- 1. Constitution Component
- (1) Polyamide 66 or Polyamide 6
- Any polyamide resin known in the art may be used as the polyamide resin component. However, it is preferable that polyamide 66 or polyamide 6 resin is used. As described herein, the polyamide 66 or polyamide 6 resin is a material that is a basis of the present invention. The polyamide resin is a material having excellent general mechanical and heat resistance properties such as tensile strength, flexural strength, flexural modulus, heat resistance, chemical resistance, and moldability. As such, the polyamide resin is extensively used in various fields such as vehicles, airplanes, space and sports.
- Further, there are advantageous in that the mechanical and heat resistance properties may be easily improved by including a reinforcing agent, such as a glass fiber, in the polyamide 66 or polyamide 6 resin.
- (2) Glass Fiber
- The glass fiber functions to improve the mechanical properties of the polyamide resin composition, such as tensile strength, flexural strength, flexural modulus and impact strength, as well as the heat resistance properties, such as a heat distortion temperature (HDT). Any glass fiber known in the art may be used as the glass fiber. In addition, it is preferable that the surface of the glass fiber is coated with a silane-based coupling agent in order to increase an interface adhesion property between the polyamide resin and the glass fiber.
- Herein, it is preferable that the content of the glass fiber is about 15 to 20 parts by weight based on 100 parts by weight of polyamide 66 or polyamide 6. In the case where the content of the glass fiber is less than about 15 parts by weight, the mechanical and heat resistance properties of the composition may be reduced. On the other hand, in the case where the content is more than about 20 parts by weight, fluidity of the composition may be reduced to deteriorate the appearance quality of molded products.
- Further, it is preferable that an average diameter of a cross section of the glass fiber is about 10 to 13 μm. In the case where the average diameter of the cross section is less than about 10 μm, since a breakage ratio of the glass fiber is high, the mechanical property of the composition may be reduced. On the other hand, in the case where the average diameter is more than about 13 μm, the appearance quality of the composition may be reduced.
- Any conventional glass fiber may be used in the present invention. Further, while any length of the glass fiber may be used, it is preferable that the glass fiber be a long glass fiber such as one having an average length of about 1 mm to 5 mm in order to improve impact strength and a dimensional stability effect of the composition. In the case where the average length of the glass fiber is less than about 1 mm, the mechanical and heat resistance properties of the composition may be reduced and a distortion phenomenon may occur in large-sized products. On the other hand, in the case where the average length is more than about 5 mm, a significant difference occurs between glass fiber alignment on the surface of the composition and the glass fiber alignment in the composition. This results in a difference in physical properties between the surface and the inside of the composition.
- According to preferred embodiments, the content of the silane-based coupling agent is about 0.1 to 0.3 wt % based on the total weight of the glass fiber. In the case where the content of the silane-based coupling agent is less than about 0.1 wt %, mechanical and heat resistance properties of the composition may be reduced. On the other hand, in the case where the content is more than about 0.3 wt %, moldability may be reduced due to an increase in viscosity of the composition.
- (3) Barium Sulfate
- Barium sulfate (BaSO4) is an inorganic filler that improves moldability and dimensional stability of the present composition and that further increases specific gravity of the composition, thus improving a sound insulation property. Since the sound insulation property is generally increased in proportion to an increase in specific gravity of the material, it is preferable to use a barium sulfate having a high specific gravity in order to improve the sound insulation property.
- Barium sulfate has Moh's hardness of about 3, which is smaller than the Moh's hardness of about 7 for iron oxide used as a conventional inorganic filler. As such, friction of screws of injection molding machines and molds is reduced during an extrusion process and molding of the present composition to improve moldability.
- It is preferable that the content of barium sulfate is about 45 to 50 parts by weight based on 100 parts by weight of polyamide 66 or polyamide 6. In the case where the content of barium sulfate is less than about 45 parts by weight, the specific gravity of the composition may be reduced to reduce the sound insulation property. On the other hand, in the case where the content is more than about 50 parts by weight, appearance quality and physical properties may be reduced.
- In addition, it is preferable that the average diameter of the particles of barium sulfate is about 20 to 30 μm. In the case where the average diameter is less than about 20 μm, moldability and dimensional stability may be reduced. On the other hand, in the case where the average diameter is more than about 30 μm, a surface area of barium sulfate is reduced, and effective sound insulation property cannot be obtained.
- (4) Antioxidant
- The antioxidant functions to suppress a reaction of oxidative degradation during extrusion and injection processes of the composition. Any conventional antioxidant may be used in the present invention, but it is preferable to use a mixture of a phenol-based antioxidant and a phosphate-based antioxidant.
- The phenol-based antioxidant is reacted with radicals generated in plastics to discharge hydrogen in the phenol-based antioxidant, thereby stabilizing the radicals, and the antioxidant is converted into the radicals and remains in a stable form through a resonance effect or re-arrangement of electrons.
- Any conventional phenol-based antioxidant may be used in the present invention, but it is preferable that the phenol-based antioxidant is N,N′-1,6-hexanediylbis(3,5-bis(1,1-dimethylethyl)-4-hydroxybenzene-propaneamide or bis-(3,3-bis-(4′-hydroxy-3′-tetrabutylphenyl)butanoic acid)-glycolester.
- Further, the phosphite-based antioxidant performs a function of a hydroperoxide decomposer to prevent the radicals from being generated. Further, if the phosphite-based antioxidant is used together with the phenol-based antioxidant, a synergistic effect can be expected and stability of cross-linked plastics and stability to UV are increased.
- Any conventional phosphite-based antioxidant may be used in the present invention, but it is preferable that the phosphite-based antioxidant is tris-(2,4-di-tertiary-butylphenyl)-phosphite or tetrakis(2,4-di-tertiary-butylphenyl)-4,4′-biphenylene diphosphite.
- According to a preferred embodiment, the composition contains about 0.3 to 0.5 parts by weight and more preferably 0.4 parts by weight of the mixed antioxidant, based on 100 parts by weight of polyamide 66 or polyamide 6. In the case where the content of the antioxidant is less than about 0.3 parts by weight, the antioxidant cannot sufficiently prevent oxidation, and where the content is more than about 0.5 parts by weight, physical properties and the quality of appearance may be reduced.
- (5) Heat Resistant Stabilizer
- The heat resistant stabilizer functions to improve heat resistance of the composition, and any matter known in the art may be used as the heat resistant stabilizer. According to preferred embodiments, the heat resistant stabilizer is an iodine-based heat resistant stabilizer. According to an exemplary embodiment, the heat resistant stabilizer is copper iodide (CuI).
- The content of the heat resistant stabilizer is preferably about 0.3 to 0.5 parts by weight and more preferably about 0.2 parts by weight based on 100 parts by weight of the polyamide 66 or polyamide 6 resin. In the case where the content of the heat resistant stabilizer is less than about 0.3 parts by weight, the heat resistance properties, such as the heat distortion temperature, of the composition may be reduced. On the other hand, in the case where the content is more than about 0.5 parts by weight, the mechanical properties and the appearance quality may be reduced.
- (6) Lubricant
- The lubricant functions to adjust friction between the compositions or between the composition and a metal when the composition is heated and molded to improve fluidity and a release property to thereby facilitate processing. Any conventional lubricant may be used in the present invention, and according to preferred embodiments, an olefine-based lubricant, more preferably ethylene bisstearamide, is used.
- The content of the lubricant is preferably about 0.2 to 0.4 parts by weight and more preferably about 0.2 parts by weight based on 100 parts by weight of the polyamide 66 or polyamide 6 resin. In the case where the content of the lubricant is less than about 0.2 parts by weight, the fluidity and the release property may be reduced, and thus it may be difficult to mold large-sized products. In the case where the lubricant content is more than about 0.4 parts by weight, mechanical properties and weld strength may be reduced.
- 2. Use
- The present invention provides excellent sounds insulation properties and may be applied in various ways so as to provide sound insulation. In particular, it is preferred that the present invention is applied to a partition of an engine room of a vehicle.
- 3. Manufacturing Method
- Hereinafter, in another aspect, the present invention relates to a method of manufacturing a polyamide resin composition for sound insulation.
- The polyamide resin composition for sound insulation may be appropriately manufactured by a person of ordinary skill in the art with reference to known technologies. Specifically, it is preferable that the polyamide resin composition for sound insulation is manufactured so as to include about 15 to 20 parts by weight of a glass fiber, preferably a glass fiber coated with a silane-based coupling agent, about 45 to 50 parts by weight of barium sulfate, about 0.3 to 0.5 parts by weight of antioxidant, preferably a mixture of a phenol-based antioxidant and a phosphite-based antioxidant, about 0.3 to 0.5 parts by weight of the heat resistant stabilizer and about 0.2 to 0.4 parts by weight of the lubricant, based on 100 parts by weight of the polyamide 66 or polyamide 6 resin.
- Hereinafter, the present invention will be described in further detail with reference to examples. It will be obvious to a person having ordinary skill in the art that these examples are illustrative purposes only and are not to be construed to limit the scope of the present invention.
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FIG. 1 is a mimetic diagram showing thepartition 100 of the engine room of the vehicle which was formed from the polyamide resin compositions of the Examples and Comparative Examples. The components and contents of the Examples and Comparative Examples are shown in the following Table 1. Thereafter, physical properties thereof were compared, and set forth in the following Table 2. -
TABLE 1 Comparative Example Example Classification Unit 1 2 3 1 2 3 Resin Polyamide Part by 100 100 100 — 100 100 66 weight Poly- Part by — — — 100 — — propylene weight Anti- Phenols Part by 0.2 0.2 0.2 0.2 0.2 0.2 oxidant weight Phosphites Part by 0.2 0.2 0.2 0.2 0.2 0.2 weight Heat resistant Part by 0.5 0.5 0.5 0.5 0.5 0.5 stabilizer weight Lubricant Part by 0.3 0.3 0.3 0.3 0.3 0.3 weight Glass fiber (short Part by 15 20 — 25 15 15 fiber) weight Glass fiber (long Part by — — 15 — — — fiber) weight Barium sulfate Part by 50 45 50 — — — (BaSO4) weight Iron oxide (Fe2O3) Part by — — — 50 50 — weight Wollastonite Part by — — — — — 25 weight - Table 1 is a table comparing the components and the contents of the Examples and the Comparative Examples. The antioxidant, the heat resistant stabilizer and the lubricant of the above-described Table 1 were included in the same content in the Examples and the Comparative Examples, and polypropylene was only included in Comparative Example 1. Further, barium sulfate for improving the sound insulation property was only included in the Examples (in accordance with the present invention), while iron oxide and wollastonite were instead included in the Comparative Examples (not in accordance with the present invention).
- Physical and heat resistance properties of the Examples and the Comparative Examples compared through tests, and are described below.
-
TABLE 2 Test Comparative method Example Example Classification (ASTM) Unit 1 2 3 1 2 3 Specific gravity D792 — 2.06 2.05 2.06 2.15 2.10 1.83 Tensile strength D638 MPa 104 122 120 38 100 101 Flexural strength D790 MPa 152 166 158 50 150 155 flexural modulus D790 MPa 8620 10200 9400 5500 9475 9921 Impact strength D256 MPa 45 48 72 31 33 30 (+23□) heat distortion D648 ° C. 243 243 245 155 242 238 (1.82 MPa) - Table 2 is a table in which physical and heat resistance properties of the Examples and the Comparative Examples are numerically represented through the specific tests, and compared.
- The specific gravity was measured according to ASTM D792, and the tensile strength was measured according to ASTM D638 under the condition of the temperature of 23±2° C., relative humidity of 50%, atmospheric pressure, and a speed of 5 mm/min.
- The flexural strength and the flexural modulus were measured according to ASTM D790, and the cross head speed was measured under the condition of a speed of 5 mm/min.
- The impact strength was measured according to ASTM D256 as a value obtained by dividing energy when the specimen was broken by unit thickness by an Izod notch method at 23±2° C.
- The heat distortion temperature was obtained by measuring the temperature in the case where the specimen was distorted when the ambient temperature was increased at the rate of 2° C./min under the condition of a load of 1.82 MPa on the specimen according to ASTM D648.
- According to Table 2, the specific gravity was highest in Comparative Example 1, but the tensile strength, the flexural strength, the flexural modulus and the impact strength were superior in the Examples. In particular, one of the most important properties of a composition applied to the engine room of the vehicle is heat resistance. Based on the result that the heat resistance of the Examples was much better than the heat resistance of the Comparative Examples, it was demonstrated that the Examples were better than the Comparative Examples in terms of the mechanical and heat resistance properties. Further, it was demonstrated that in the case of Example 3 to which the long glass fiber was applied, all properties were better than Example 1 to which the short glass fiber was applied.
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TABLE 3 400 Hz to 6300 Hz (dB RMS) Left of Left Right Left of Right of Left of the the VIP Right of behind behind the the front seat of the VIP the left the right driver's driver's passenger Back the back seat of the engine engine Classification Unit seat seat seat seat seat back seat room room Example 3 dB 76 76.4 75.9 78.5 78 78.4 25.2 32.4 No dB 67.8 67.6 66.9 72.8 72.3 71.3 13.4 13.5 partition Difference dB 8.2 8.8 9 5.7 5.7 7.1 11.8 18.9 - Table 3 is a table in which sound insulation performances of the Examples are compared. After the high-power speaker for tests having the frequency range of 400 Hz to 6300 Hz was installed in a direction of the inside of the vehicle at a position of the engine of the engine room of the vehicle, noise was generated. The insulation of noise by the partition, to which the present invention was applied, was then measured by imaging the insulated sound. That is, the magnitude of insulated noise was increased as the measured numerical value is was increased, and the magnitude of insulated noise was reduced as the measured numerical value was reduced.
- In Table 3, in the case of Example 3 to which the partition was applied, the measured numerical value was higher than that of the case where the partition was not applied, which means that a large amount of noise is insulated by the higher numerical value. Accordingly, it was confirmed that in the case of Example 3 to which the partition was applied, the measured noise was reduced at all positions in the vehicle and right behind the engine room as compared to the case where the partition was not applied.
- To be more specific, the drawings showing graphs which classify the magnitudes of noise insulated at each position for each frequency in Table 3 are provided below.
FIG. 2 is a graph showing the magnitude of noise insulated at a left of a driver's seat for each frequency,FIG. 3 is a graph showing the magnitude of noise insulated at a right of the driver's seat for each frequency,FIG. 4 is a graph showing the magnitude of noise insulated at a left of a front passenger seat for each frequency,FIG. 5 is a graph showing the magnitude of noise insulated at a back seat for each frequency,FIG. 6 is a graph showing the magnitude of noise insulated at a left of a VIP seat of the back seat for each frequency,FIG. 7 is a graph showing the magnitude of noise insulated at a right of the VIP seat of the back seat for each frequency,FIG. 8 is a graph showing the magnitude of noise insulated directly behind a left engine room for each frequency, andFIG. 9 is a graph showing the magnitude of noise insulated directly behind a right engine room for each frequency. As seen inFIGS. 2 to 9 , even though there was a difference between frequencies, from the average values, it was demonstrated that in the case where the partition was applied (200) a high noise insulation effect was provided as compared to the case where the partition was not applied (300) in all graphs. - Further, it was confirmed that in view of only the position of the driver's seat, the partition of Example 3 (which was in accordance with the present invention) was positioned between the engine room and the dash board, and thus the noise flowing from the engine room to the position of the driver's seat was reduced by an average of 8 to 8.8 dB.
- The invention has been described in detail with reference to preferred embodiments thereof. However, it will be appreciated by those skilled in the art that changes or modifications may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A polyamide resin composition for sound insulation comprising:
about 15 to 20 parts by weight of a glass fiber, based on 100 parts by weight of polyamide 6.6 or polyamide 6,
about 45 to 50 parts by weight of barium sulfate, based on 100 parts by weight of the polyamide 6.6 or polyamide 6 resin, and
one or more of about 0.3 to 0.5 parts by weight of an antioxidant, about 0.3 to 0.5 parts by weight of a heat resistant stabilizer, or about 0.2 to 0.4 parts by weight of a lubricant, based on 100 parts by weight of the polyamide 6.6 or polyamide 6,
wherein an average length of the glass fiber is about 1 mm to 5 mm,
wherein an average diameter of a cross section of the glass fiber is about 10 to 13 μm,
wherein the glass fiber is coated with a silane-based coupling agent,
wherein a weight of the silane-based coupling agent is about 0.1 to 0.3 wt % based on a total weight of the glass fiber,
wherein an average diameter of particles of the barium sulfate is about 20 to 30 μm.
2-7. (canceled)
8. The polyamide resin composition for sound insulation according to claim 1 , the antioxidant comprises a mixture of a phenol-based antioxidant and a phosphite-based antioxidant.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR10-2013-0040585 | 2013-04-12 | ||
KR1020130040585A KR101526953B1 (en) | 2013-04-12 | 2013-04-12 | Polyamide resin composites for sound insulation |
Publications (1)
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US20140306142A1 true US20140306142A1 (en) | 2014-10-16 |
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ID=51618259
Family Applications (1)
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US13/946,230 Abandoned US20140306142A1 (en) | 2013-04-12 | 2013-07-19 | Polyamide resin composition for sound insulation |
Country Status (4)
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US (1) | US20140306142A1 (en) |
KR (1) | KR101526953B1 (en) |
CN (1) | CN104098895A (en) |
DE (1) | DE102013107386B4 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220315738A1 (en) * | 2019-09-05 | 2022-10-06 | Basf Se | Thermoplastic molding compositions that resist heat |
US12065565B2 (en) | 2018-05-11 | 2024-08-20 | Sabic Global Technologies B.V. | Noise reducing filled polyester |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102396826B1 (en) * | 2015-09-15 | 2022-05-11 | 코오롱플라스틱 주식회사 | Polyamide resin composition, and molded artice manufactured therefrom |
CN106243518A (en) * | 2016-08-29 | 2016-12-21 | 合肥会通新材料有限公司 | A kind of reduction air conditioner noises polypropylene composite materials PP Pipe Compound and preparation method thereof |
KR20190090427A (en) * | 2018-01-25 | 2019-08-02 | 현대자동차주식회사 | Polyamide resin composition with reduced radiation noise |
KR102189102B1 (en) | 2019-04-10 | 2020-12-09 | 나홍주 | Sound absorbing material and method for fabricating the same |
CN112694747A (en) * | 2020-12-17 | 2021-04-23 | 辰东意普万新材料(广东)有限公司 | Heat-insulation noise-reduction polyamide composite material for engine compartment firewall |
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JPS5744633A (en) * | 1980-08-30 | 1982-03-13 | Toyoda Gosei Co Ltd | Soundproof material of synthetic resin |
JP2996412B2 (en) * | 1990-08-02 | 1999-12-27 | 株式会社ブリヂストン | Sound insulation resin composition |
JP4072242B2 (en) | 1997-05-26 | 2008-04-09 | 三菱エンジニアリングプラスチックス株式会社 | Polyamide resin composition |
JP2004269550A (en) | 2003-03-05 | 2004-09-30 | Toray Ind Inc | Polyamide resin composition excellent in sound insulating property and fluidity, and molded article formed therefrom |
JP2005232239A (en) | 2004-02-18 | 2005-09-02 | Toray Ind Inc | Polyamide resin composition and molding consisting of the same |
DE102005041966A1 (en) | 2005-09-03 | 2007-03-08 | Clariant Produkte (Deutschland) Gmbh | Polyamide moulding material, e.g. for production of electrical switches and plugs, contains thermoplastic polyamide, phosphinate salt, synergist or phosphorus-nitrogen fire retardant, reinforcing fibres and filler |
EP1882719B1 (en) * | 2006-07-11 | 2017-04-19 | Ems-Chemie Ag | Polyamide moulding composition and use thereof |
CA2661526A1 (en) * | 2006-08-25 | 2008-02-28 | Sachtleben Chemie Gmbh | Barium sulfate-containing composite |
CN1931920B (en) * | 2006-08-28 | 2011-09-07 | 浙江阳光纳米科技有限公司 | Drinking water meter of nanometer composite nylon material |
KR101449048B1 (en) | 2008-10-14 | 2014-10-13 | 현대자동차주식회사 | Composition of polyamide 6 resin for enginecover of automobile |
KR20100049348A (en) * | 2008-11-03 | 2010-05-12 | 현대자동차주식회사 | Resin composite for automobile engine cover with glass bubble |
KR20100124621A (en) * | 2009-05-19 | 2010-11-29 | 현대자동차주식회사 | Resin composition of polyamide for automobile gear shift knob |
KR101294073B1 (en) | 2011-10-14 | 2013-08-07 | 현대자동차주식회사 | Mounting device for vehicle door hinge |
-
2013
- 2013-04-12 KR KR1020130040585A patent/KR101526953B1/en active IP Right Grant
- 2013-07-12 DE DE102013107386.7A patent/DE102013107386B4/en active Active
- 2013-07-19 US US13/946,230 patent/US20140306142A1/en not_active Abandoned
- 2013-07-26 CN CN201310319453.6A patent/CN104098895A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US12065565B2 (en) | 2018-05-11 | 2024-08-20 | Sabic Global Technologies B.V. | Noise reducing filled polyester |
US20220315738A1 (en) * | 2019-09-05 | 2022-10-06 | Basf Se | Thermoplastic molding compositions that resist heat |
Also Published As
Publication number | Publication date |
---|---|
CN104098895A (en) | 2014-10-15 |
KR101526953B1 (en) | 2015-06-09 |
KR20140123341A (en) | 2014-10-22 |
DE102013107386B4 (en) | 2022-03-10 |
DE102013107386A1 (en) | 2014-10-16 |
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Owner name: KIA MOTORS CORPORATION, KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YOUN, JEE-YOUNG;LEE, SANG-ILL;REEL/FRAME:030838/0001 Effective date: 20130605 Owner name: HYUNDAI MOTOR COMPANY, KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YOUN, JEE-YOUNG;LEE, SANG-ILL;REEL/FRAME:030838/0001 Effective date: 20130605 |
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