KR20170032936A - Polyamide resin composition, and molded artice manufactured therefrom - Google Patents

Abstract

The present invention relates to a polyamide resin composition consisting of a polyamide resin, a glass fiber, a damping inorganic material, a flowability improver, and an impact resistance agent. A plastic molded article produced by using the composition of the present invention exhibits outstanding noise suppression properties by containing the damping inorganic material as well as surface properties, processability, and hardness owing to the glass fiber contained therein, and also shows superior surface properties by containing the flowability improver, thereby being applicable to cylinder head covers for covering upper portions of engine cylinders.

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyamide resin composition and a plastic molding using the same. More specifically, the present invention relates to a polyamide resin composition, a glass fiber, a gaseous inorganic material, And a plastic resin composition prepared from the composition.

In the automobile manufacturing industry, in recent years, in addition to high performance, aesthetic interior and exterior designs are required. Many covers for various automobile parts are being developed in accordance with the demand according to the trend. The role of the covers is to not only make the appearance look beautiful by covering the external appearance of the parts but also to prevent the inherent noise generated from the parts at the same time.

An example of such a cover is a cylinder head cover of the engine. The cylinder head cover not only shows clean and beautiful appearance of the engine room, but also has a function of absorbing and absorbing noises generated from the engine, and the demand is increasing.

That is, a cylinder head cover for an automobile which covers the upper part of the engine cylinder is used for the purpose of cutting off or reducing the noise from the engine appearance and the clean appearance of the engine room. In the past, And is being applied to trucks.

The characteristics required of the engine cover material are that the cylinder head cover is basically mounted on the periphery of the engine and therefore must have excellent mechanical properties. Since the cylinder head cover is large in size, the resin flowability is good from the viewpoint of workability, Is very excellent, and ultimately must have excellent noise cancellation effect. The plastic molded body used as a cover of an ordinary engine or the like is made of a composition using glass fiber and mineral filler applied to nylon or PET resin, but the physical properties and appearance characteristics are not sufficiently satisfied, Is a disadvantage.

They are well-known in U.S. Pat. No. 5,206,084 and European Patent No. 1312647, which are proposed techniques for improving the functionality by adding an elastomer to the impact resistance defects caused by reinforcing inorganic fillers. This technique is excellent in impact resistance and toughness due to the addition of an elastomer, but has a disadvantage in that the heat resistance is lowered and the surface becomes poor during molding, so that it is difficult to apply to limited use. In addition, as a method of improving noise, there is a method of canceling the noise by absorbing noise and a method of reflecting the sound on the surface.

In order to improve these characteristics, the US Patent No. 6,101,667 discloses that by introducing zinc oxide (ZnO ₂ ), which is a high-purity filler, and zinc oxide whisker in the form of tetrapod, the noise improvement effect is improved. However, Korean Patent No. 0828654 discloses a technique in which glass bubbles are applied to improve the surface of a glass fiber reinforced polyamide resin composition and to prevent shrinkage. However, surface properties can be improved, but in order to be used as an automotive engine component, A limit was found that the condition was not met sufficiently.

The present invention relates to an inorganic reinforced polyamide resin composition. More particularly, the present invention relates to an inorganic reinforced polyamide resin composition having excellent mechanical strength and excellent impact and surface properties by adding glass fiber and mineral filler to a polyamide resin.

In order to improve the impact strength of the mechanical strength, an olefin elastomer impact resistant agent was used. In order to solve the problem of lowering the fluidity due to the addition of the conventional elastomer, a flow improver was introduced to solve the problem of the high content inorganic polyamide resin I want to.

According to a first preferred embodiment of the present invention, there is provided a polyamide resin composition comprising 40 to 70 parts by weight of glass fiber, 5 to 25 parts by weight of a vibration damping inorganic material, and a flow improver 0.5 To 1.7 parts by weight of a polyamide resin composition.

The flow improver according to the first embodiment may be a hindered amine photostabilizer compound (HALS).

The polyamide resin according to the first embodiment may have a relative viscosity of 2.5 to 3.3 and a number average molecular weight of 20,000 to 50,000.

The glass fiber according to the first embodiment may have a shape of 촙, a diameter of 8 to 15 탆, a length of 2 to 5.0 mm, and may be treated with a coupling agent.

The composition according to the first embodiment may further comprise 3 to 10 parts by weight of the impact resistant agent, and the impact resistant agent may be one obtained by grafting maleic anhydride.

The specific gravity of the vibration damping inorganic material according to the first embodiment may be 3.0 to 6.0.

The damping inorganic material according to the first embodiment may be at least one selected from the group consisting of barium sulfate, zinc oxide, zinc sulfide, titanium oxide, and iron oxide.

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

The molded article according to the second embodiment has a tensile strength of 190 MPa to 210 MPa, a flexural strength of 280 MPa to 340 MPa, and an impact strength of 100 J / m to 150 J / m.

The polyamide resin composition according to the present invention can exhibit excellent noise insulation characteristics while securing excellent mechanical properties and can be applied to parts such as a cylinder head cover for an automobile and an engine room bulkhead.

According to one aspect of the present invention, there is provided a polyamide resin composition comprising a polyamide resin, wherein 40 to 70 parts by weight of glass fiber, 5 to 25 parts by weight of a vibration damping inorganic material, and a flow improver 0.5 to 1.7 Based on the total weight of the polyamide resin composition. In addition, a plastic molding comprising the polyamide resin composition can be provided.

By incorporating the flowability-improving agent into the polyamide resin composition, it is possible to improve not only the surface of the high-content inorganic filler grade but also the effect of solving the problem of flow marks and surface gas marks that may occur on the surface when using an impact- .

1) Polyamide resin

The polyamide resin to be used in the present invention may be selected from the group consisting of polyamide 6, polyamide 12, polyamide 66, polyamide 6/66, polyamide 6/12, polyamide 6/6 T, polyamide 6/6 I and copolymers thereof And may be one or more selected from the group consisting of. In the examples of the present invention, nylon 6,6 resin having excellent mechanical rigidity and heat resistance was used, but the present invention is not limited thereto.

The relative viscosity of the polyamide resin may be from 2.5 to 3.3. The relative viscosity of the polyamide resin may be 20 ° C, 100 ml of 96% sulfuric acid, 20 g of a solution of 1 g of polyamide resin in 100 ml of 96% Relative viscosity is measured value.

If the relative viscosity of the polyamide resin is less than 2.5, excellent effects can not be obtained in terms of improvement in stiffness and dimensional stability. If the relative viscosity is more than 3.3, surface defects and unformed phenomena may occur due to a decrease in flowability.

The number average molecular weight of the polyamide resin may be from 20,000 to 50,000. If the number average molecular weight is less than 20,000, the rigidity is lowered. If the number average molecular weight is more than 50,000, the flowability is poor due to high viscosity, It may not.

On the other hand, the polyamide resin of the present invention may be used in the form of a chip for the production of the resin composition according to the present invention and sufficiently dried in a dehumidifying dryer.

2) Glass fiber

The glass fiber according to the present invention may have a chop shape having a diameter of 8 to 15 mu m and a length of 2 to 5.0 mm and a surface treated with a coupling agent.

If the diameter is less than 8 占 퐉, the glass fiber is easily broken and it is not enough to improve the rigidity. When the diameter exceeds 15 占 퐉, the rigidity is improved, but the appearance quality is not obtained due to the problem of projecting on the surface.

When the length of the glass fiber is less than 2 mm, the glass fiber length is short to improve the rigidity. When the length of the glass fiber exceeds 5 mm, the rigidity improves. However, since the length of the glass fiber protrudes, .

The coupling agent is preferably a silane-based material having an organic functional group such as a vinyl group, an epoxy group, a mercaptan group or an amine group.

The content of the glass fiber in the present invention may be 40 to 70 parts by weight based on 100 parts by weight of the polyamide resin. If the content of the glass fiber is less than 40 parts by weight, the effect of imparting rigidity may be insufficient. If the amount is more than 70 parts by weight, the glass fiber may protrude to the surface to deteriorate the appearance quality. Warpage, and warpage may occur.

3) Dissipative inorganic matter

In the present invention, the vibration damping inorganic material is one that has a function of insulating vibration. That is, in the present invention, glass fiber is used to reinforce the strength of the polyamide resin composition. However, when glass fiber alone is used, it is difficult to secure excellent surface characteristics due to glass fiber protrusion and flow marks on the surface, It is desirable to add a dichromatic inorganic substance.

The damping inorganic material may be at least one selected from the group consisting of diantimony trioxide (Diantimony trioxide, Sb ₂ O ₃ ), barium sulfate (BaSO ₄ ), zinc oxide (ZnO), zinc sulfide (ZnS) Titanium Dioxide, TiO ₂ , and Iron Oxide (Fe ₂ O ₃ ).

The vibration damping inorganic material may have a specific gravity of 3.0 to 6.0 or more. Those having a specific gravity of less than 3.0 are effective in improving the mechanical strength, but are similar to the specific gravity of the glass fiber (2.4 to 2.6), so that the noise blocking property due to the effect of increasing the mass per unit area of the material is insignificant. In the case of inorganic inert materials with a specific gravity of more than 6.0, the high specific gravity results in poor processability in mixing with plastics and is generally unsuitable for use as a plastic reinforcing agent.

The reason why the damping inorganic material has a relatively high specific gravity can be explained by the following equation which predicts the acoustic transmission loss as follows.

Mass Law: TL0? 20log (mf)

TL0: permeation loss, m: per unit area of material Mass, f  : frequency

Acoustic transmission loss can be regarded as a degree of blocking noise. If the mass per unit area of the material through which the sound passes is high as in the above equation, the acoustic transmission loss becomes large, which may have an effect of blocking the noise.

In order to improve the performance of blocking the noise by using the vibration damping inorganic material, the vibration damping characteristic can be improved by increasing the weight per unit area of the resin composition by using the vibration damping inorganic material having a high specific gravity.

In addition, it is possible to increase the glass fiber content of the multi-faced fiber only for the reinforcement of strength. However, since the surface property and the noise-shielding property are not good, the inorganic fiber can be used as a vibration-

The content of the vibration damper inorganic material may be 5 to 25 parts by weight based on 100 parts by weight of the polyamide resin. If the content of the inorganic particles is less than 5 parts by weight, the effect of improving the noise by the vibration damping inorganic material becomes insignificant If it exceeds 25 parts by weight, the impact strength is lowered.

4) Impact Resistant

The polyamide resin composition of the present invention may further include an impact resistant agent to ensure impact resistance. The impact resistant agent may be an ethylene octene block copolymer grafted with maleic anhydride and an ethylene propylene block copolymer grafted with maleic anhydride. Polymer, and the like.

The content of the impact resistant agent may be less than 3 parts by weight based on 100 parts by weight of the polyamide resin. If the content of the impact resistant agent is more than 10 parts by weight, the impact strength may be improved, but the tensile strength and the flexural strength are decreased It is difficult to obtain a good product surface.

5) Flow improver

In the present invention, a hindered amine light stabilizer (HALS) is used to improve surface characteristics and flow characteristics of a material. The HALS compound used in the present invention has an amide bond and forms a hydrogen bond with the amide bond of the polyamide to improve the plasticizing property. As a result, the plasticizing property of the polyamide is improved and the flowability is also increased.

The amount of the HALS compound added is preferably 0.5 to 1.7 parts by weight based on 100 parts by weight of the polyamide resin.

The HALS compound may be 1,3-benzenedicarboxamide, N, N'-bis (2,2,6,6-tetramethyl-4-piperidinyl) (C ₂₆ H ₄₂ N ₄ O ₂ , Cas No. 42774-15-2 ), Which is represented by the following general formula (1).

≪ Formula 1 >

If it is less than 0.5 parts by weight based on 100 parts by weight of the polyamide resin, flowability and surface effect may not be easy to obtain. If the amount exceeds 1.7 parts by weight, excess amount of the resin may exist, .

[Manufacturing method]

The polyamide resin composition according to the present invention can be produced by applying the respective components as described above, that is, a polyamide resin, a glass fiber, and a vibration damping inorganic material to an extruder and extruding it.

Specifically, the polyamide resin composition as described above may be kneaded at 240 ° C to 280 ° C using a twin screw extruder to produce the polyamide resin composition. At this time, in order to maximize the kneading of the polyamide resin composition, a polyamide resin is injected into the primary injection port by using an extruder having three injection ports. In some cases, the polyamide resin composition can be added together with an additive such as an impact resistant agent, And the glass fiber can be injected into the third inlet. In order to prevent thermal decomposition of the polyamide resin composition during melt kneading, the residence time can be minimized and the rotation of the screw can be adjusted to about 150 to 800 rpm in consideration of the dispersibility of the polyamide resin composition.

As described above, the polyamide resin composition according to the present invention includes a polyamide resin, a glass fiber, a vibration damping inorganic material, and a flow improver, and the polyamide resin composition has excellent tensile strength, flexural strength, flexural modulus, And the noise shielding property is excellent.

The polyamide resin composition according to the present invention has a tensile strength of 190 MPa to 210 MPa according to ASTM evaluation method D638, a flexural strength of 280 MPa to 340 MPa according to ASTM evaluation method D790 and an impact strength of 100 J / m to 150 J / m 2 according to ASTM evaluation method D256 It can be applied to automobile engine room parts

Particularly, it is suitable as a material for manufacturing a cylinder head cover of an automobile which requires mechanical properties such as strength and noise shielding characteristics.

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  1, 3, 4

Polyamide resin (Ascend社PA66 Vydyne 50BW), glass fiber (KCC社Glass Fiber CS311), damping minerals (KOCH社KCB-8000 barium sulfate _ specific gravity 4.5g / cc) and the flowability improver (Clariant社Nylostab ^® S- by melting in the twin-screw extruder heated to 280 ℃ kneading according to the composition as shown in the EED ^®) in Table 1 to prepare a polyamide resin composition. The composition was made into a chip state, dried using a dehumidifying dryer at 100 ° C for 4 hours, and a specimen containing a polyamide resin composition was prepared at the same temperature as that in the melt kneading using a screw extruder.

Example  2

A specimen containing the polyamide resin composition was prepared in the same manner as in Example 1, except that the impact resistance agent (PARALOID (TM) EXL-3808, The Dow Chemical Company) was additionally used in accordance with the content shown in Table 1. [

Example  5

A specimen containing a polyamide resin composition was prepared in the same manner as in Example 1, except that the kind of the damping inorganic material was changed to antimony acid oxide (IY-HW antimony trioxide specific gravity 5.65 g / cc, manufactured by Iyang Chemical Co., Ltd.) .

Example  6 and 7

(Dow Chemical Company, PARALOID (TM) EXL-3808) was changed to the content shown in Table 1, and the impact resistance agent (PARALOID (TM) EXL-3808) was changed to the antioxidant antioxidant (IY- A specimen containing a polyamide resin composition was prepared in the same manner as in Example 1,

Comparative Example  One, Comparative Example  2, Comparative Example  4

(KCB-8000 barium sulfate _ specific gravity of 4.5 g / cc) of KOCH Co., Ltd.) was blended in accordance with the composition as shown in Table 2 to obtain 280 g of a polyamide resin (Ascend PA66 Vydyne 50BW), glass fiber (KCC Glass Fiber CS311) Melt-kneaded in a twin-screw extruder heated to < RTI ID = 0.0 > 20 C < / RTI > to produce a polyamide resin composition. The composition was made into a chip state, dried using a dehumidifying dryer at 100 ° C for 4 hours, and a specimen containing a polyamide resin composition was prepared at the same temperature as that in the melt kneading using a screw extruder.

Comparative Example  3

This Comparative Example 3 was produced by the same method as in Comparative Example 1, except that the impact resistance agent (PARALOID (TM) EXL-3808 available from The Dow Chemical Company) was additionally used in accordance with the content shown in Table 2 Respectively.

Comparative Example  5 - Comparative Example  7

Comparative Examples 5 to 7 were prepared in the same manner as in Comparative Examples 1 and 2 except that the damping inorganic material was changed to the antimony acid oxide (IY-HW antimony trioxide having a specific gravity of 5.65 g / cc, available from Iyang Chemical Co., Ltd.) A specimen containing the polyamide resin composition was prepared in the same manner.

Comparative Example  8

Comparative Example 8 was prepared in the same manner as in Comparative Example 1 except that the damping inorganic material was changed to talc (KCNAP-400 talc, specific gravity of 2.6 g / cc, KOCH Co., Ltd.) A specimen containing the composition was prepared.

Comparative Example  9

Comparative Example 9 was changed to the vibration damping properties of the mineral acid type antimony oxide (Ilyang chemical社IY-HW diantimony trioxide _ weight 5.65g / cc), flowability improving agents ^{(Clariant社Nylostab ® S-EED} ®) in Table 2 A specimen containing a polyamide resin composition was prepared in the same manner as in Comparative Example 1, except that it was further used in accordance with the content.

Comparative Example  10

Comparative Example 10 Comparative Example 1, except for using the flowability improver ^{(Clariant社Nylostab ® S-EED} ®) and impact the (The Dow Chemical Company社PARALOID ™ EXL-3808) further according to the content shown in Table 2 A specimen including a polyamide resin composition was prepared.

Polyamide 66 ^{1 )} Glass fiber ^{2 )} Dissipative inorganic matter 1 ^{3 )} Dissipative inorganic matter 2 ^{4 )} Flow improvers ^{5 )} Impact resistance ^{6 )} Example 1 100 67 8 - 0.5 - Example 2 100 67 8 - 0.5 5 Example 3 100 55 20 - 0.8 - Example 4 100 45 25 - One - Example 5 100 56 - 10 0.5 - Example 6 100 54 - 15 0.8 5 Example 7 100 47 - 20 One 5 1. Polyamide 66: Ascend PA66 Vydyne 50BW
2. Glass fiber: CS311 from KCC
3. Vibrational properties Mineral 1: KOCH KCB-8000 Barium sulfate _ Specific gravity 4.5g / cc
4. Dissipative Inorganic 2: Ilyang Chemical IY-HW Antimony Trioxide 5. Specific Gravity 5.65g / cc
5. Flow improver: Clariant Nylostab ^® S-EED ^®
6. Impact Resistance: PARALOID ™ EXL-3808 from The Dow Chemical Company

Polyamide 66 ^{1 )} Glass fiber ²⁾ Dissipative inorganic matter 1 ^{3 )} Dissipative inorganic matter 2 ^{4 )} Dissipative Minerals 3 ⁵⁾ Flow improvers ^{6 )} Impact Resistance ^{7 )} Comparative Example 1 100 67 8 - - - - Comparative Example 2 100 40 30 - - - - Comparative Example 3 100 30 20 - - - 15 Comparative Example 4 100 80 10 - - - - Comparative Example 5 100 56 - 10 - - - Comparative Example 6 100 80 - 10 - - - Comparative Example 7 100 43 - 30 - - - Comparative Example 8 100 67 - - 10 - - Comparative Example 9 100 54 - 10 - 2 - Comparative Example 10 100 55 20 - - 0.2 5 1. Polyamide 66: Ascend PA66 Vydyne 50BW
2. Glass fiber: CS311 from KCC
3. Vibrational properties Mineral 1: KOCH KCB-8000 Barium sulfate _ Specific gravity 4.5g / cc
4. Dissipative Inorganic 2: Ilyang Chemical IY-HW Antimony Trioxide 5. Specific Gravity 5.65g / cc
5. Dissipative Inorganic 3: KOCH KCNAP-400 Talc _ Specific Gravity 2.6g / cc
6. Flow improver: Clariant Nylostab ^® S-EED ^®
7. Impact Resistance: PARALOID ™ EXL-3808 from The Dow Chemical Company

Property evaluation

Tensile strength, flexural strength, impact strength, surface properties and noise barrier properties of the polyamide resin compositions prepared in Examples and Comparative Examples were measured in the following manner, and the results are shown in Table 3.

1) Tensile strength: A 1/8 inch specimen was prepared according to ASTM evaluation method D 638 and then measured

2) Flexural strength: A 1/8 inch specimen was manufactured according to ASTM D790 and then measured.

3) Impact strength: A 1/8-inch specimen was prepared in accordance with ASTM D256 and the Izod Notched impact strength was measured at room temperature and low temperature (-30 ° C).

4) Surface flow mark: The resin composition of the present invention, which was prepared after melting and kneading, was dried in a dehumidification type dryer at 90 ° C for 5 hours and then passed through a 170-ton Nissay injection molding machine, Injection temperature of 280 ° C and mold temperature of 80 ° C were fixed by using a square mold having a diameter of 7 mm and a length of 80 mm and a primary injection pressure of only 1,100 kg / ² , an injection time of 3 seconds, and a cooling time of 15 seconds. Particularly, the flow mark of the gate portion was visually observed.

5) Noise isolation measurement: Evaluation was carried out based on the evaluation method based on ISO 10847: 1997 (E). Noise generators and octave band pass filters on the noise side. A loudspeaker and a power amplifier were installed and a sound barrier with a height of 3 m was installed at a distance of 1.5 m from a power amplifier. A noise signal of 500 to 3000 Hz was generated from a noise source at a position 1.5 m higher than the sound- And the noise was measured. Then, the noise reduction interferometer was installed at the same height as the soundproof wall height, and the noise level difference was measured at the same distance and height, and the noise level difference was found to be 4 dB or more

Noise Level Difference = (noise only when installing sound barrier) - (noise when installing sound barrier + noise reduction material)

division Tensile Strength (MPa) Flexural Strength (MPa) Impact strength (J / m) Flow mark Noise level difference (dB) Example 1 208 320 125 Good 5.4 Example 2 197 293 147 Good 5.3 Example 3 194 287 135 Good 5.7 Example 4 192 285 106 Good 6.2 Example 5 207 328 118 Good 5.7 Example 6 197 300 115 Good 6.1 Example 7 190 282 100 Good 5.1 Comparative Example 1 201 311 110 Bad 4.8 Comparative Example 2 123 200 311 Bad 3.1 Comparative Example 3 175 265 97 Bad 3.2 Comparative Example 4 220 350 115 Bad 5.9 Comparative Example 5 205 315 112 Bad 5.2 Comparative Example 6 217 345 113 Bad 3.8 Comparative Example 7 170 257 94 Bad 3.4 Comparative Example 8 138 201 84 Good 2.8 Comparative Example 9 194 308 118 Bad 5.7 Comparative Example 10 196 298 110 Bad 5.1

As a result of evaluation of the physical properties, as shown in Table 3, the polyamide resin composition prepared by using the polyamide resin, glass fiber, vibration damping inorganic material, and flow improver in appropriate compositions in Examples 1 to 8 had tensile strength, The impact strength, the noise shielding property and the surface characteristics are excellent, and the applicability to the cylinder head cover material which is a peripheral component of an automobile engine can be confirmed.

As can be seen from the flow mark results of Comparative Examples 2 to 6, it was confirmed that when the flow improver was not included, the glass fiber protruded to the surface and the appearance quality deteriorated.

In this case, Comparative Example 1 contained 30 parts by weight of the glass fiber, which showed good results even without the flowability improver, but showed poor physical properties in terms of tensile strength and impact strength.

In the case of Comparative Example 7, no flow mark is shown even though the flow improver is not included. This phenomenon is considered to be a phenomenon in which the talc includes the inorganic inert material, and the presence of the talc causes severe breakage of the glass fiber due to the talc The role of the enhancer becomes insufficient. Therefore, it has been confirmed that the tensile strength and the impact strength deteriorate the physical properties and are not suitable for use in parts around automobile engines.

Comparative Example 8 contains more than 1.7 parts by weight of the flowability improver, and it can be confirmed that the extraneous substance is present in the resin rather deteriorates the appearance quality.

In Comparative Example 9, 30 parts by weight of the glass fiber was included, and it was confirmed that even though the flow improver was contained in an amount of less than 0.4 part by weight, the surface quality was excellent, but the tensile strength was also lowered.

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 (9)

Characterized in that it comprises a polyamide resin and comprises 40 to 70 parts by weight of glass fibers, 5 to 25 parts by weight of a vibration damping inorganic material and 0.5 to 1.7 parts by weight of a flow improver, based on 100 parts by weight of the polyamide resin. Amide resin composition.
The method according to claim 1,
Wherein the flow improver is a hindered amine photostabilizer compound (HALS).
The method according to claim 1,
Wherein the polyamide resin has a relative viscosity of 2.5 to 3.3 and a number average molecular weight of 20,000 to 50,000.
The method according to claim 1,
Wherein the glass fiber has a 촙 shape, a diameter of 8 to 15 탆, a length of 2.0 to 5.0 mm, and is treated with a coupling agent.
The method according to claim 1,
Wherein the composition further comprises 3 to 10 parts by weight of an impact resistant agent, wherein the impact resistant agent is grafted with maleic anhydride.
The method according to claim 1,
Wherein the specific gravity of the vibration damping inorganic material is 3.0 to 6.0.
The method according to claim 1,
Wherein the vibration damping inorganic material is at least one selected from the group consisting of antimony trioxide, barium sulfate, zinc oxide, zinc sulfide, titanium oxide, and iron oxide.
A plastic molding comprising the polyamide resin composition according to any one of claims 1 to 7.
9. The method of claim 8,
Wherein the molded product has a tensile strength of 190 MPa to 210 MPa, a flexural strength of 280 MPa to 340 MPa, and an impact strength of 100 J / m to 150 J / m.