KR20160083529A - Polyamide resin composition, and molded artice manufactured therefrom - Google Patents

Abstract

The present invention relates to a polyamide resin, comprising a polyamide resin, an agent for impact resistance, and a nanolayered double hydroxide. The composition of the present invention comprising the nanolayered double hydroxide has excellent gas blocking properties, and has excellent processability and strength, thereby being desirably applied to a process for particularly manufacturing a hollow molded body.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyamide resin composition,

More particularly, the present invention relates to a composition comprising a polyamide (PA) resin, a polyolefin impactor grafted with maleic anhydride, and an inorganic reinforcing agent, To a plastic resin composition prepared from the composition.

Generally, a gas-barrier nanocomposite manufacturing technology is applied to a barrier resin such as an ethylene-vinyl alcohol copolymer (EVOH), a polyamide, an ionomer, and a polyvinyl alcohol (PVA) Compounding the layered clay compound into the layered clay compound by intercalating the layered clay compound into the layered clay compound by nano-size dispersion in the barrier resin, and exhibiting excellent mechanical strength and gas barrier property.

The gas-barrier nanocomposite composition as described above is mainly used for blow molding. Blow molding is a method of blowing a fluid into a hollow parison (bottom, no floor) in a mold. At this time, the melt viscosity of the composition must be high for blow molding.

Molded bodies made of polyamide resins are widely used in automotive manufacturing because polyamides generally have good properties in terms of mechanical, thermal, and chemical resistance.

In the prior art, EP 2325260 A1 discloses a polyamide molding material for producing a variety of pipe systems in the automotive field, but it has a problem that the production process is complicated, the melt viscosity is low and the surface properties are not suitable for blow molding .

As such, for polyamide resins, high melt viscosity is important. If the melt strength is too low, there is a disadvantage that the physical properties are lowered. However, in the case of a molded article having an excessively high melt strength, surface properties are poor and workability is poor.

On the other hand, the layered double hydroxide is a kind of natural clay, and it is an anionic clay that can exchange anions between clay layers with positive ions in layers. Because of the general formula referred to LDH, also it called anionic clay or hydrotalcite material is _{^{[M 2+ 1-x M 3+}} x (OH) 2] x + [(A n -) x / n H 2 O] is represented by ^x- Mg ^{2 +} , Co ^{2 +} , and Ni ^{2 +} are mainly used as the bivalent metal, and Al ^{3 +} and Cr ^{3 +} are mainly used as the trivalent metal. In addition to CO ₃ ^2- and Cl ^- , anions such as nitrate ions can be intercalated in the anion, which is represented by A, and the hydrotalcite is a interlayer anion, and most of the carbonates are contained in the anion.

Therefore, by changing the structure or structure of hydrotalcite, the type of anions inserted in the interlayer are replaced, thereby expanding application fields such as catalysts, medicines, and applications to anion exchangers. LDH has properties such as large surface area, memory effect, anion exchange capacity and thermal stability, and is also applicable to the treatment of harmful anions contained in wastewater.

Accordingly, the present invention provides a polyamide resin composition comprising a polyamide resin composition containing an impact resistance agent and a nano-layered double hydroxide, which is excellent in impact resistance, excellent in fuel gas barrier property, and capable of being used for blow molding or injection molding And the like.

A first preferred embodiment according to the present invention comprises: 60 to 80% by weight of a polyamide resin; 15 to 30% by weight of an impact resistance; And 1 to 5% by weight of a nano-layered double hydroxide.

The polyamide according to the first embodiment may be polyamide 6 or polyamide 66.

The relative viscosity of the polyamide according to the first embodiment may be 1 to 5.

The composition according to the first embodiment may be a polyolefin grafted with maleic anhydride.

The nano-layered double hydroxide according to the first embodiment may be Mg ₄ Al ₂ (OH) ₈ O ₂ (CO ₃ ).

A second preferred embodiment according to the present invention is a plastic hollow molded article comprising the polyamide resin composition.

INDUSTRIAL APPLICABILITY The polyamide resin composition according to the present invention can exhibit gas barrier properties while ensuring excellent impact resistance, including an impact resistant agent and a nano-layered double hydroxide, and can be usefully used for blow molding or injection molding.

1 is a photograph of a cross section of a fuel pipe for a vehicle molded with a polyamide resin composition produced according to an embodiment of the present invention, with a transmission electron microscope (x20000).

According to one aspect of the present invention, there is provided a polyamide resin composition comprising 60 to 80% by weight of a polyamide resin; 15 to 30% by weight of an impact resistance; And 1 to 5% by weight of a nano-layered double hydroxide, based on the total weight of the polyamide resin composition.

In the present invention, by using a polyolefin having a relative viscosity of 1 to 5 and a grafted maleic anhydride as an impact resistance agent, it is possible to obtain excellent flow index and physical properties of a molded article made of the polyamide resin of the present invention.

Further, the present invention shows excellent gas barrier properties including layered double hydroxides.

Hereinafter, the present invention will be described in detail.

The present inventors have been studying impact resistance and fuel gas barrier properties of kneading of nanocomposite while preparing a nanocomposite by dispersing a layered double hydroxide in a nano-sized polyamide 6 resin , The gas permeating path inside the barrier resin is lengthened to increase the barrier property of the barrier resin itself and the blowing ability can be improved by increasing the impact resistance at room temperature and the low temperature impact resistance. In addition, the polyamide resin and impact- Has been found to be excellent in mechanical strength, impact resistance, fuel gas barrier property, and blow moldability, and the present invention has been accomplished on the basis thereof.

(A) Poly  Amide resin

The polyamide resin used in the composition of the present invention may be polyamide 6 or polyamide 66 resin. At this time, a low viscosity polyamide or a high viscosity polyamide can be used.

The polyamide resin in the composition of the present invention is preferably used in an amount of 60 to 80% by weight. If the polyamide resin is used in an amount less than 60% by weight, the tensile strength and the bending strength may be lowered. If the polyamide resin is used in an amount exceeding 80% by weight, impact resistance and cold shock at room temperature may be deteriorated.

The polyamide resin used in the present invention has a relative viscosity of 2.4 to 3.5 (based on a value measured with a 1 g solution of nylon 6 resin in 100 ml of 96 ° C sulfuric acid at 20 캜), and has a number average molecular weight of 20,000 to 50,000 The mechanical properties can be improved. If the relative viscosity is less than 2.4, the tensile strength and the impact strength may be lowered. If the relative viscosity is higher than 3.5, excessive friction heat may be generated between the screw and the resin in the molding machine, There is a problem that the injection molding becomes difficult because the molding machine and the mold are clogged with each other. When the number average molecular weight is less than 20,000, the stiffness may be lowered. When the number average molecular weight is more than 50,000, the flowability is poor due to the high viscosity, which may cause problems during melt-kneading. It is good to use.

(B) Impact Resistant

The impact resistant agent used in the present invention is a polyolefin grafted with maleic anhydride. In this case, when polyolefin grafted with maleic anhydride is used, excellent impact resistance at room temperature and cold shock resistance can be obtained.

The impact resistance agent is preferably used in an amount of 15 to 30% by weight in the composition of the present invention. If the impact resistance is less than 15% by weight, impact resistance and impact resistance at room temperature may be deteriorated. If the impact resistance is used in excess of 30% by weight, there may be a problem of deterioration of tensile strength.

(C) Nano Layered double hydroxide

The nano-layered double hydroxide used in the present invention is a material having a double layer structure in which an anion can be exchanged between layers because a divalent metal and a trivalent metal are contained between hydroxyl groups of two layers. An inorganic material having a layered structure and capable of ion exchange is classified into a cation and an anion exchanger depending on the kind of the ion. Cation exchangers vary in their kind, including clays, but the anion exchangers are typically layered double hydroxides (LDHs)

The fuel gas barrier nanocomposite exhibits a blocking effect by uniformly dispersing the layered double hydroxide in the polyamide 6 resin, which is a discontinuous phase, according to the content of the layered double hydroxide. This is because the layered double hydroxide, which is finely peeled off in the polyamide 6 resin, forms a barrier film, thereby improving the barrier properties of the barrier resin itself and improving the mechanical properties. Ultimately, the barrier properties and the mechanical properties It is possible to obtain an effect of improving the performance of the apparatus.

Accordingly, in the present invention, the polyamide 6 resin and the layered double hydroxide are kneaded to disperse the layered compound in the nano-scale in the barrier resin so as to maximize the contact area between the polymer chain and the layered compound, thereby maximizing the gas permeation inhibiting ability. When the nano-layered double hydroxide is less than 1% by weight, the ability to inhibit gas permeation may not be sufficient, and when the amount of the nano-layered double hydroxide is less than 5% by weight, the impact resistance of the composition If it exceeds, the nanoparticle double hydroxide may not be dispersed in the resin.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are provided only for the purpose of easier understanding of the present invention, and the present invention is not limited by the examples.

[ Example ]

Example  One. For blowing Barrier property  Manufacture of nanocomposites

79.0 wt% of polyamide 6 resin (Polyamide 6, Domamid 32, relative viscosity: 3.26 to 3.34, Germany), and Impact Modifier (Maleic Anhydride Grafted (MAH) Polyolefin, US DOW, Paraloid® EXL-3808 ) And 1.0 wt% of Layered Double Hydroxides (P2, Mg ₄ Al ₂ (OH) ₈ O ₂ (CO ₃ )) as a nano-layered double hydroxide were charged in the main hopper of a twin-screw extruder (TEK-30) After the addition, a polyamide 6 / layered double hydroxide nanocomposite was prepared.

At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, extruded, screw speed was 400 rpm, and discharge condition was 40 kg / hr.

Example  2. For blowing Barrier property  Manufacture of nanocomposites

78.0% by weight of a polyamide 6 resin (Polyamide 6, Domamid® 32, relative viscosity: 3.26 to 3.34, Germany), and Impact Modifier, Maleic Anhydride Grafted (MAH) Polyolefin, US DOW, Paraloid® EXL-3808 ) And 2.0 wt% of Layered Double Hydroxides (P2, Mg ₄ Al ₂ (OH) ₈ O ₂ (CO ₃ )) as a nano-layered double hydroxide were charged in the main hopper of a twin screw extruder (TEK-30) After the addition, a polyamide 6 / layered double hydroxide nanocomposite was prepared. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Example  3. For blowing Barrier property  Manufacture of nanocomposites

77.0 wt% of polyamide 6 resin (Polyamide 6, Domamid 32, relative viscosity: 3.26 to 3.34, Germany), and Impact Modifier (Maleic Anhydride Grafted (MAH) Polyolefin, USA DOW, Paraloid® EXL-3808 ) And 3.0 wt% of Layered Double Hydroxides (P2, Mg ₄ Al ₂ (OH) ₈ O ₂ (CO ₃ )) as a nano-layered double hydroxide were placed in the main hopper of a twin-screw extruder (TEK-30) After the addition, a polyamide 6 / layered double hydroxide nanocomposite was prepared. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Example  4. For blowing Barrier property  Manufacture of nanocomposites

74.0% by weight of a polyamide 6 resin (Polyamide 6, Domamid® 32, relative viscosity: 3.26 to 3.34, Germany), and an impact modifier, Maleic Anhydride Grafted (MAH) Polyolefin, US DOW, Paraloid® EXL-3808 ) in the main hopper of a 25% by weight and the nano-layered double hydroxides (layered double hydroxides, Korea _{Sinwonsa, P2, Mg 4 Al 2 (} OH) 8 O 2 (CO 3)) and 1.0% by weight of the twin-screw extruder (TEK-30) After the addition, a polyamide 6 / layered double hydroxide nanocomposite was prepared. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Example  5. For blowing Barrier property  Manufacture of nanocomposites

Polyamide 6 resin (Polyamide6, Germany DOMO four, Domamid® 32, relative viscosity: 3.26 ~ 3.34), 73.0% by weight, impact resistance and zero (Impact Modifier, Maleic Anhydride Grafted (MAH) Polyolefin, US DOW Company, Paraloid EXL-3808 ^® ) in the main hopper of a 25% by weight, and a nano-layered double hydroxides (layered double hydroxides, Korea _{Sinwonsa, P2, Mg 4 Al 2 (} OH) 8 O 2 (CO 3)) 2.0% by weight of the twin-screw extruder (TEK-30) After the addition, a polyamide 6 / layered double hydroxide nanocomposite was prepared. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Example  6. For blowing Barrier property  Manufacture of nanocomposites

72.0 wt% of polyamide 6 resin (Polyamide 6, Domamid® 32, relative viscosity: 3.26 to 3.34, Germany), and Impact Modifier (Maleic Anhydride Grafted (MAH) Polyolefin, US DOW, Paraloid® EXL-3808 ) And 3.0 wt% of Layered Double Hydroxides (P2, Mg ₄ Al ₂ (OH) ₈ O ₂ (CO ₃ )) as a nano-layered double hydroxide were placed in the main hopper of a twin-screw extruder (TEK-30) After the addition, a polyamide 6 / layered double hydroxide nanocomposite was prepared. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Example  7. For blowing Barrier property  Manufacture of nanocomposites

74.0 wt% of polyamide 6 resin (Polyamide 6, Domamid 32, relative viscosity: 3.26 to 3.34, Germany), and Impact Modifier (maleic anhydride grafted (MAH) Polyolefin, Dupont, Fusabond® N493, : 0.87 g / cm3) to 25% by weight and the nano-layered double hydroxides (layered double hydroxides, Korea _{Sinwonsa, P2, Mg 4 Al 2 (} OH) 8 O 2 (CO 3)) and 1.0% by weight of the twin-screw extruder (TEK-30 ) To prepare a polyamide 6 / layered double hydroxide nanocomposite. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Example  8. For blowing Barrier property  Manufacture of nanocomposites

73.0 wt% of polyamide 6 resin (Polyamide 6, Domamid® 32, relative viscosity: 3.26 to 3.34, Germany), and Impact Modifier, Maleic Anhydride Grafted (MAH) Polyolefin, Dupont, Fusabond® N493, : 0.87 g / cm3) to 25% by weight and the nano-layered double hydroxides (layered double hydroxides, Korea _{Sinwonsa, P2, Mg 4 Al 2 (} OH) 8 O 2 (CO 3)) 2.0% by weight of the twin-screw extruder (TEK-30 ) To prepare a polyamide 6 / layered double hydroxide nanocomposite. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Example  9. For blowing Barrier property  Manufacture of nanocomposites

72.0 wt.% Of polyamide 6 resin (Polyamide 6, Domamid® 32, relative viscosity: 3.26 to 3.34, Germany), and Impact Modifier, Maleic Anhydride Grafted (MAH) Polyolefin, Dupont, Fusabond® N493, : 0.87 g / cm3) to 25% by weight and the nano-layered double hydroxides (layered double hydroxides, Korea _{Sinwonsa, P2, Mg 4 Al 2 (} OH) 8 O 2 (CO 3)) 3.0% by weight of the twin-screw extruder (TEK-30 ) To prepare a polyamide 6 / layered double hydroxide nanocomposite. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Example  10. Injection Barrier property  Manufacture of nanocomposites

74.0% by weight of polyamide 6 resin (Polyamide 6, Domamid 24, relative viscosity: 2.40 to 2.50, Germany), and Impact Modifier (Maleic Anhydride Grafted (MAH) Polyolefin, US DOW, Paraloid® EXL-3808 ) in the main hopper of a 25% by weight and the nano-layered double hydroxides (layered double hydroxides, Korea _{Sinwonsa, P2, Mg 4 Al 2 (} OH) 8 O 2 (CO 3)) and 1.0% by weight of the twin-screw extruder (TEK-30) After the addition, a polyamide 6 / layered double hydroxide nanocomposite was prepared. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Example  11. Injection Barrier property  Manufacture of nanocomposites

73.0% by weight of polyamide 6 resin (Polyamide 6, Domamid 24, relative viscosity: 2.40 to 2.50, Germany), and Impact Modifier (Maleic Anhydride Grafted (MAH) Polyolefin, USA DOW, Paraloid® EXL-3808 ) in the main hopper of a 25% by weight, and a nano-layered double hydroxides (layered double hydroxides, Korea _{Sinwonsa, P2, Mg 4 Al 2 (} OH) 8 O 2 (CO 3)) 2.0% by weight of the twin-screw extruder (TEK-30) After the addition, a polyamide 6 / layered double hydroxide nanocomposite was prepared. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Example  12. Injection Barrier property  Manufacture of nanocomposites

72.0 wt.% Of polyamide 6 resin (Polyamide 6, Domamid 24, relative viscosity: 2.40 to 2.50), and Impact Modifier (maleic anhydride grafted (MAH) Polyolefin, USA DOW, Paraloid® EXL-3808 ) And 3.0 wt% of Layered Double Hydroxides (P2, Mg ₄ Al ₂ (OH) ₈ O ₂ (CO ₃ )) as a nano-layered double hydroxide were placed in the main hopper of a twin-screw extruder (TEK-30) After the addition, a polyamide 6 / layered double hydroxide nanocomposite was prepared. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Comparative Example  One

80.0% by weight of polyamide 6 resin (Polyamide 6, Domamid® 32, relative viscosity: 3.26 to 3.34, Germany), and Impact Modifier, Maleic Anhydride Grafted (MAH) Polyolefin, US DOW, Paraloid® EXL-3808 ) Was put into a main hopper of a twin-screw extruder (TEK-30) to prepare a polyamide 6 impact resistant material. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Comparative Example  2

79.9% by weight of polyamide 6 resin (Polyamide 6, Domamid® 32, relative viscosity: 3.26 to 3.34, Germany), and Impact Modifier, Maleic Anhydride Grafted (MAH) Polyolefin, US DOW, Paraloid® EXL-3808 ) And 0.1 wt% of Layered Double Hydroxides (P2, Mg ₄ Al ₂ (OH) ₈ O ₂ (CO ₃ )) as the nano-layered double hydroxides were placed in the main hopper of a twin screw extruder (TEK-30) After the addition, a polyamide 6 / layered double hydroxide nanocomposite was prepared. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Comparative Example  3

70.0% by weight of polyamide 6 resin (Polyamide 6, Domamid® 32, relative viscosity: 3.26 to 3.34, Germany), and Impact Modifier, Maleic Anhydride Grafted (MAH) Polyolefin, US DOW, Paraloid® EXL-3808 ) in the main hopper of a 20.0% by weight and the nano-layered double hydroxides (layered double hydroxides, Korea _{Sinwonsa, P2, Mg 4 Al 2 (} OH) 8 O 2 (CO 3)) 10.0 wt%, a twin-screw extruder (TEK-30) After the addition, a polyamide 6 / layered double hydroxide nanocomposite was prepared. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Comparative Example  4

75.0% by weight of polyamide 6 resin (Polyamide 6, Domamid® 32, relative viscosity: 3.26 to 3.34, Germany), and Impact Modifier, Maleic Anhydride Grafted (MAH) Polyolefin, US DOW, Paraloid® EXL-3808 ) Was put into a main hopper of a twin-screw extruder (TEK-30) to prepare a polyamide 6 impact resistant material. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Comparative Example  5

74.9% by weight of a polyamide 6 resin (Polyamide 6, Domamid® 32, relative viscosity: 3.26 to 3.34, Germany), and Impact Modifier, maleic anhydride grafted (MAH) Polyolefin, US DOW, Paraloid® EXL-3808 ) And 0.1 wt% of Layered Double Hydroxides (P2, Mg ₄ Al ₂ (OH) ₈ O ₂ (CO ₃ )) as a nano-layered double hydroxide were added to the main hopper of a twin screw extruder (TEK-30) After the addition, a polyamide 6 / layered double hydroxide nanocomposite was prepared. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

Comparative Example  6

65.0 wt% of polyamide 6 resin (Polyamide 6, Domamid® 32, relative viscosity: 3.26 to 3.34, Germany), and Impact Modifier (Maleic Anhydride Grafted (MAH) Polyolefin, US DOW, Paraloid® EXL-3808 ) in the main hopper of a 25.0% by weight and the nano-layered double hydroxides (layered double hydroxides, Korea _{Sinwonsa, P2, Mg 4 Al 2 (} OH) 8 O 2 (CO 3)) 10.0 wt%, a twin-screw extruder (TEK-30) After the addition, a polyamide 6 / layered double hydroxide nanocomposite was prepared. At this time, the extrusion temperature was 240-245-250-255-260-260-260-260 ° C, the screw speed was 400 rpm, and the discharging condition was 40 kg / hr.

The compositions of the above Examples and Comparative Examples are summarized in Table 1.

division PA6
(weight%) Relative viscosity Impact Resistant
(weight%) LDH
(weight%) Sum Example 1 79 3.26 ~ 3.34 20 One 100 Example 2 78 3.26 ~ 3.34 20 2 100 Example 3 77 3.26 ~ 3.34 20 3 100 Example 4 74 3.26 ~ 3.34 25 One 100 Example 5 73 3.26 ~ 3.34 25 2 100 Example 6 72 3.26 ~ 3.34 25 3 100 Example 7 74 3.26 ~ 3.34 25 One 100 Example 8 73 3.26 ~ 3.34 25 2 100 Example 9 72 3.26 ~ 3.34 25 3 100 Example 10 74 2.40 to 2.50 25 One 100 Example 11 73 2.40 to 2.50 25 2 100 Example 12 72 2.40 to 2.50 25 3 100 Comparative Example 1 80 3.26 ~ 3.34 20 0 100 Comparative Example 2 79.9 3.26 ~ 3.34 20 0.1 100 Comparative Example 3 70 3.26 ~ 3.34 20 10 100 Comparative Example 4 75 3.26 ~ 3.34 25 0 100 Comparative Example 5 74.9 3.26 ~ 3.34 25 0.1 100 Comparative Example 6 65 3.26 ~ 3.34 25 10 100

The flow index, impact strength and gas permeability of the polyamide resin compositions prepared in Examples and Comparative Examples were measured in the following manner, and the results are shown in Table 2.

≪ Method for measuring physical properties &

(1) The flow index

A flow index was measured at 260 DEG C under a load of 5000 g according to ASTM D1238.

(2) Impact strength

Room Temperature Impact Strength Measurement: A 1/4 inch specimen was made according to ASTM D256 and Izod Notched impact strength was measured.

Low Temperature Impact Strength Measurement: A 1/4 inch specimen was prepared according to ASTM D256 and aged at minus 40 ° C for 4 hours and Izod Notched impact strength was measured.

(3) Gas permeability

A sample of 3 mm x 3 inches was prepared according to SAE J2665 and weighed at 60 ° C for 6 weeks.

division ASTM
D1238
Flow index
(g / 10 min)
5000g ASTM
D256
Izod Impact
(J / m) 23 DEG C ASTM
D256
Izod Impact
(J / m) -40 DEG C SAE
J2665
Gas permeability
(g / day) Example 1 3.2 256.2 81.1 0.042 Example 2 2.2 263.5 70.1 0.032 Example 3 1.4 270.9 60.8 0.023 Example 4 2.8 N.B 95.2 0.043 Example 5 1.9 N.B 94.5 0.031 Example 6 0.4 N.B 88.4 0.021 Example 7 2.6 N.B 90.2 0.044 Example 8 1.8 N.B 86.7 0.033 Example 9 0.9 N.B 82.6 0.023 Example 10 18.5 N.B 90.9 0.045 Example 11 16.6 N.B 77.4 0.034 Example 12 13.2 N.B 68.6 0.025 Comparative Example 1 6.7 268.5 83.1 0.112 Comparative Example 2 6.6 267.4 82.6 0.110 Comparative Example 3 0.3 321.6 54.6 0.062 Comparative Example 4 3.6 333.7 98.6 0.111 Comparative Example 5 3.4 336.8 98.2 0.112 Comparative Example 6 0.2 386.5 65.5 0.054

As a result of evaluation of physical properties, as shown in Table 2, the polyamide resin composition prepared by using a polyamide resin, an impact resistant agent and a nano-layered double hydroxide as appropriate compositions as in the present invention is excellent in flow index, impact strength, Respectively.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will appreciate that such specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereto will be. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

Claims (6)

60 to 80% by weight of a polyamide resin; 15 to 30% by weight of an impact resistance; And 1 to 5% by weight of a nano-layered double hydroxide.
The method according to claim 1,
Wherein the polyamide is polyamide 6 or polyamide 66. 6. The polyamide resin composition according to claim 1,
The method according to claim 1,
Wherein the polyamide has a relative viscosity of 1 to 5.
The method according to claim 1,
Wherein the impact resistant agent is a polyolefin grafted with maleic anhydride.
The method according to claim 1,
Wherein the nano-layered double hydroxide is Mg ₄ Al ₂ (OH) ₈ O ₂ (CO ₃ ).
A plastic hollow molded article comprising the polyamide resin composition according to any one of claims 1 to 5.