Polyamide resin composition and article produced therefrom

Abstract

A polyamide resin composition of the present invention comprises: approximately 100 parts by weight of an aliphatic polyamide resin; approximately 65-135 parts by weight of glass fibers; approximately 35-65 parts by weight of glass powder; approximately 5-28 parts by weight of kaolin; and approximately 25-75 parts by weight of a flame retardant comprising at least one from among a metal phosphinate compound and a phosphorus-nitrogen-based compound. The polyamide resin composition has excellent flame resistance, flame retardancy, impact resistance, rigidity, thermal stability, the balance of these physical properties, and the like.

Description

Polyamide resin composition and molded article formed therefrom

[0001] The present invention relates to a polyamide resin composition and a molded article formed therefrom. More specifically, the present invention relates to a polyamide resin composition having excellent flame resistance, flame retardancy, impact resistance, rigidity, thermal stability, and a balance of these physical properties, and a molded article formed therefrom.

[0002]

[0003] Polyamide resins are widely used in various fields due to their excellent moldability and chemical resistance. Methods are employed to enhance flame retardancy by applying fillers and flame retardants to polyamide resins, while simultaneously improving mechanical properties such as impact resistance and stiffness.

[0004] When thermoplastic resin compositions containing such polyamide resins are used as components for electric vehicle batteries, flame retardancy properties in the event of thermal runaway are required for safety, in addition to flame retardancy. 'Thermal runaway,' a major cause of electric vehicle battery fires, is a phenomenon in which heat is generated as stress is applied to battery cells due to various causes. Flames occur when the internal temperature of the battery rises above a certain level due to short circuits, such as overvoltage or over-discharge; however, lithium-ion batteries are highly reactive with water, making it difficult to easily extinguish a fire with water.

[0005] Therefore, there is a need to develop polyamide resin compositions with excellent flame resistance, flame retardancy, impact resistance, rigidity, thermal stability, and a balance of these physical properties.

[0006] The background technology of the present invention is disclosed in Korean Published Patent No. 10-2024-0031877, etc.

[0007]

[0008] The objective of the present invention is to provide a polyamide resin composition having excellent flame resistance, flame retardancy, impact resistance, rigidity, thermal stability, and a balance of these physical properties.

[0009] Another objective of the present invention is to provide a molded article formed from the polyamide resin composition.

[0010] The above and other objectives of the present invention can all be achieved by the present invention described below.

[0011]

[0012] 1. One aspect of the present invention relates to a polyamide resin composition. The polyamide resin composition comprises about 100 parts by weight of an aliphatic polyamide resin; about 65 to about 135 parts by weight of glass fiber; about 35 to about 65 parts by weight of glass powder; about 5 to about 28 parts by weight of kaolin; and about 25 to about 75 parts by weight of a flame retardant comprising one or more of a metal phosphinate compound and a phosphino-nitrogen compound.

[0013] 2. In the above 1 embodiment, the aliphatic polyamide resin may include one or more of polyamide 6, polyamide 11, polyamide 12, polyamide 4.6, polyamide 6.6, and polyamide 6.10.

[0014] 3. In the above 1 or 2 embodiments, the glass fiber may include one or more types of glass fibers having a circular cross-section with a cross-sectional diameter of about 5 to about 20 μm and a length before processing of about 2 to about 20 mm, and glass fibers having a rectangular cross-section with an aspect ratio (major axis of the cross-section / minor axis of the cross-section) of about 1.5 to about 10, a minor axis of about 2 to about 10 μm, and a length before processing of about 2 to about 20 mm.

[0015] 4. In the above 1 to 3 embodiments, the glass powder may have an average particle size (D50) of about 5 to about 150 μm.

[0016] 5. In the above 1 to 4 embodiments, the kaolin may have an average particle size (D50) of about 1 to about 50 μm.

[0017] 6. In the above 1 to 5 embodiments, the metal phosphinate compound may include one or more of aluminum diethyl phosphinate and zinc diethyl phosphinate.

[0018] 7. In the above 1 to 6 embodiments, the phosphate-nitrogen compound may include one or more of melamine polyphosphate, melamine / ammonium polyphosphate, melamine phosphate, and melamine pyrophosphate.

[0019] 8. In the above 1 to 7 embodiments, the flame retardant may be a mixture of the metal phosphinate compound and the phosphino-nitrogen compound in a weight ratio of about 1:0.1 to about 1:1.

[0020] 9. In the above 1 to 8 embodiments, the polyamide resin composition may not produce a hole in the specimen when a flame is radiated for 600 seconds on a specimen with a thickness of 2 mm fixed at a distance of 50 mm from the torch mouth using a butane gas torch with a flame temperature of 1,000 to 1,200°C.

[0021] 10. In the above 1 to 9 embodiments, the polyamide resin composition may have a flame retardancy of V-0 or higher for a 1.5 mm thick injection molded specimen measured by the UL-94 vertical test method.

[0022] 11. In the above 1 to 10 embodiments, the polyamide resin composition may have a notched Izod impact strength of about 5 to about 15 kgf·cm / cm of a 1 / 8" thick specimen measured according to ASTM D256.

[0023] 12. In the above embodiments 1 to 11, the polyamide resin composition has a tensile strength of about 1,300 to about 2,500 kgf / cm² of a 3.2 mm thick specimen measured at 5 mm / min according to ASTM D638. 2 It could be.

[0024] 13. In the above embodiments 1 to 12, the polyamide resin composition has a flexural strength of about 1,500 to about 3,500 kgf / cm² of a 6.4 mm thick specimen measured at 2.8 mm / min according to ASTM D790. 2 It may be, and according to ASTM D790, the flexural modulus of a 6.4 mm thick specimen measured under a condition of 2.8 mm / min is approximately 80,000 to approximately 200,000 kgf / cm 2 It could be.

[0025] 14. In the above embodiments 1 to 13, the polyamide resin composition is subjected to a load of 18.56 kgf / cm² in accordance with ASTM D648. 2 The heat distortion temperature (HDT) of a 6.4 mm thick specimen measured under a heating rate of 120℃ / hr may be approximately 180 to approximately 250℃.

[0026] 15. Another aspect of the present invention relates to a molded article. The molded article may be formed from a polyamide resin composition according to any one of 1 to 14.

[0027]

[0028] The present invention has the effect of providing a polyamide resin composition having excellent flame resistance, flame retardancy, impact resistance, rigidity, thermal stability, and a balance of physical properties thereof, and a molded article formed therefrom.

[0029]

[0030] The present invention will be described in detail below.

[0031] The polyamide resin composition according to the present invention comprises (A) an aliphatic polyamide resin; (B) glass fiber; (C) glass powder; (D) kaolin; and (E) a flame retardant.

[0032] In this specification, "a to b" indicating a numerical range is defined as "≥a and ≤b".

[0033]

[0034] (A) Aliphatic polyamide resin

[0035] An aliphatic polyamide resin according to one embodiment of the present invention can be applied together with glass fibers, glass powder, kaolin, and specific flame retardants to improve flame resistance, flame retardancy, impact resistance, stiffness, thermal stability, and the balance of physical properties thereof of a polyamide resin composition, and an aliphatic polyamide resin used in a conventional polyamide resin composition can be used.

[0036] In a specific example, the aliphatic polyamide resin may be polyamide 6, polyamide 11, polyamide 12, polyamide 4.6, polyamide 6.6, polyamide 6.10, combinations thereof, etc. For example, polyamide 6, etc. may be used.

[0037] In a specific example, the aliphatic polyamide resin may have a melting temperature (Tm) measured by differential scanning calorimetry (DSC) of about 255 to about 275°C, for example, about 260 to about 270°C. Within this range, the moldability, thermal stability, etc. of the polyamide resin composition may be excellent.

[0038] In a specific example, the aliphatic polyamide resin may have an intrinsic viscosity (IV) of about 2 to about 4 dL / g, for example, about 2 to about 2.7 dL / g, measured by an Ubbelodhde viscometer at 25°C after being dissolved in a concentrated sulfuric acid (96%) solution at a concentration of 0.5 g / dL. Within this range, the moldability, impact resistance, and stiffness of the polyamide resin composition may be excellent.

[0039]

[0040] (B) Glass fiber

[0041] A glass fiber according to one embodiment of the present invention can be applied together with an aliphatic polyamide resin, glass powder, kaolin, and a specific flame retardant, etc., to improve the flame resistance, flame retardancy, impact resistance, stiffness, thermal stability, and the balance of physical properties thereof of a polyamide resin composition, and can use a glass fiber used in a conventional thermoplastic resin composition.

[0042] In a specific embodiment, the glass fiber may be in the form of a fiber and may have a cross-section of various shapes, such as circular, elliptical, or rectangular. For example, using a fiber-shaped glass fiber with a circular and / or rectangular cross-section may be preferable in terms of mechanical properties.

[0043] In a specific example, the glass fiber with a circular cross-section may have a cross-sectional diameter of about 5 to about 20 μm as measured by an optical microscope and a length of about 2 to about 20 mm before processing, and the glass fiber with a rectangular cross-section may have an aspect ratio (major axis of the cross-section / minor axis of the cross-section) of about 1.5 to about 10 as measured by an optical microscope, a minor axis of about 2 to about 10 μm, and a length of about 2 to about 20 mm before processing. Within the above range, the rigidity, moldability, etc. of the polyamide resin composition may be excellent.

[0044] In a specific example, the glass fiber may be treated with a conventional surface treatment agent. The surface treatment agent may include, but is not limited to, silane compounds, urethane compounds, epoxy compounds, etc.

[0045] In a specific example, the glass fiber may be included in an amount of about 65 to about 135 parts by weight, for example, about 70 to about 130 parts by weight, specifically about 77 to about 129 parts by weight, with respect to about 100 parts by weight of the aliphatic polyamide resin. If the content of the glass fiber is less than about 65 parts by weight, there is a risk that the flame resistance, impact resistance, rigidity, etc. of the polyamide resin composition will be reduced, and if it exceeds about 135 parts by weight, there is a risk that the flame retardancy, moldability, etc. of the polyamide resin composition will be reduced.

[0046]

[0047] (C) Glass powder

[0048] A glass powder according to one embodiment of the present invention can be applied together with an aliphatic polyamide resin, glass fiber, kaolin, and a specific flame retardant, etc., to improve the flame resistance, flame retardancy, impact resistance, stiffness, thermal stability, and the balance of physical properties thereof of a polyamide resin composition, and can use glass frit used in conventional thermoplastic resin compositions.

[0049] In a specific example, the glass powder may include B2O3, Al2O3, R2O, P2O5, etc. as constituent components.

[0050] In a specific example, the glass powder may have an average particle size (D50) measured by a particle size analyzer (Malvern mastersizer 3000) of about 5 to about 150 μm, for example, about 10 to about 100 μm. Within this range, the flame resistance, appearance characteristics, moldability, etc. of the polyamide resin composition may be excellent.

[0051] In a specific example, the glass powder may be included in an amount of about 35 to about 65 parts by weight, for example, about 40 to about 60 parts by weight, specifically about 44 to about 58 parts by weight, with respect to about 100 parts by weight of the aliphatic polyamide resin. If the content of the glass powder is less than about 35 parts by weight, there is a risk that the flame resistance, etc. of the polyamide resin composition will decrease, and if it exceeds about 65 parts by weight, there is a risk that the flame resistance, rigidity, etc. of the polyamide resin composition will decrease.

[0052] In a specific example, the weight ratio (B:C) of the glass fiber and the glass powder may be about 1:0.3 to about 1:0.9, for example, about 1:0.35 to about 1:0.65. Within this range, the flame resistance, impact resistance, rigidity, etc. of the polyamide resin composition may be superior.

[0053]

[0054] (D) Kaolin

[0055] Kaolin according to one embodiment of the present invention can be applied together with an aliphatic polyamide resin, glass fiber, glass powder, and a specific flame retardant, etc., to improve the flame resistance, flame retardancy, impact resistance, stiffness, thermal stability, and the balance of physical properties thereof of a polyamide resin composition, and kaolin used in conventional thermoplastic resin compositions can be used.

[0056] In a specific example, the kaolin may be plate-shaped, and the average particle size (D50) measured by a particle size analyzer (Malvern mastersizer 3000) may be about 0.2 to about 50 μm, for example, about 1 to about 50 μm, for example, about 1 to about 10 μm. Within the above range, the flame resistance, appearance characteristics, moldability, etc. of the polyamide resin composition may be excellent.

[0057] In a specific example, the kaolin may be coated with a coating agent such as an epoxy compound, a urethane compound, or a silane compound. The coating may cover all or part of the surface of the inorganic filler. For example, the coating may be applied by spray coating with about 0.01 to about 1 part by weight of the coating agent per about 100 parts by weight of kaolin, but is not limited thereto.

[0058] In a specific example, the kaolin may be included in an amount of about 5 to about 28 parts by weight, for example, about 10 to about 25 parts by weight, with respect to about 100 parts by weight of the aliphatic polyamide resin. If the content of the kaolin is less than about 5 parts by weight, there is a risk that the flame resistance of the polyamide resin composition will decrease, and if it exceeds about 28 parts by weight, there is a risk that the impact resistance of the polyamide resin composition will decrease.

[0059] In a specific example, the weight ratio (B:D) of the glass fiber and the kaolin may be about 1:0.07 to about 1:0.3, for example, about 1:0.09 to about 1:0.27. Within this range, the flame resistance, flame retardancy, impact resistance, rigidity, etc. of the polyamide resin composition may be superior.

[0060] In a specific example, the weight ratio (C:D) of the glass powder and the kaolin may be about 1:0.1 to about 1:0.7, for example, about 1:0.2 to about 1:0.5. Within this range, the flame resistance, flame retardancy, impact resistance, rigidity, etc. of the polyamide resin composition may be superior.

[0061]

[0062] (E) Flame retardant

[0063] A flame retardant according to one embodiment of the present invention may be applied together with an aliphatic polyamide resin, glass fiber, glass powder, kaolin, etc., to improve the flame resistance, flame retardancy, impact resistance, rigidity, thermal stability, and balance of physical properties thereof of a polyamide resin composition, and may use a flame retardant comprising one or more of a metal phosphinate compound and a phosphino-nitrogen compound. For example, the flame retardant may be a mixture of a metal phosphinate compound and a phosphino-nitrogen compound or a metal phosphinate compound alone.

[0064] In a specific example, the metal phosphinate compound may include one or more of aluminum diethyl phosphinate and zinc diethyl phosphinate.

[0065] In a specific example, the phosphate-nitrogen compound may include one or more of melamine polyphosphate, melamine / ammonium polyphosphate, melamine phosphate, and melamine pyrophosphate.

[0066] In a specific example, when the flame retardant is a mixture of a metal phosphinate compound and a phosphino-nitrogen compound, the weight ratio of the metal phosphinate compound and the phosphino-nitrogen compound may be about 1:0.1 to about 1:1, for example, about 1:0.1 to about 1:0.5, specifically about 1:0.1 to about 1:0.3. Within this range, the flame resistance, flame retardancy, etc. of the polyamide resin composition may be superior.

[0067] In a specific example, the flame retardant may be included in an amount of about 25 to about 75 parts by weight, for example, about 27 to about 50 parts by weight, with respect to about 100 parts by weight of the aliphatic polyamide resin. If the content of the flame retardant is less than about 25 parts by weight, there is a risk that the flame resistance, flame retardancy, etc. of the polyamide resin composition will be reduced, and if it exceeds about 75 parts by weight, there is a risk that the impact resistance, etc. of the polyamide resin composition will be reduced.

[0068]

[0069] A polyamide resin composition according to one embodiment of the present invention may further include additives included in conventional polyamide resin compositions. Examples of said additives include, but are not limited to, antioxidants, heat stabilizers, UV stabilizers, lubricants, release agents, nucleating agents, flame retardants, pigments, dyes, mixtures thereof, flame retardant aids, and other inorganic additives.

[0070] In a specific example, when using the above additive, the content may be about 0.001 to about 20 parts by weight, for example about 0.1 to about 10 parts by weight, with respect to about 100 parts by weight of the aliphatic polyamide resin.

[0071]

[0072] A polyamide resin composition according to one embodiment of the present invention may be in the form of pellets produced by mixing the above components and melt-extruding them using a conventional twin-screw extruder at about 240 to about 300°C, for example, about 260 to about 280°C.

[0073] In a specific example, the polyamide resin composition may not produce a hole in the specimen when a flame is radiated for 600 seconds on a specimen with a thickness of 2 mm fixed at a distance of 50 mm from the torch mouth using a butane gas torch in which the flame temperature measured by a digital thermometer is 1,000 to 1,200°C.

[0074] In a specific example, the polyamide resin composition may have a flame retardancy of V-0 or higher for a 1.5 mm thick injection molded specimen measured by the UL-94 vertical test method.

[0075] In a specific example, the polyamide resin composition may have a notched Izod impact strength of a 1 / 8" thick specimen measured according to ASTM D256 of about 5 to about 15 kgf·cm / cm, for example, about 5 to about 10 kgf·cm / cm.

[0076] In a specific example, the polyamide resin composition has a tensile strength of about 1,300 to about 2,500 kgf / cm² of a 3.2 mm thick specimen measured at 5 mm / min according to ASTM D638. 2 , for example, about 1,400 to about 2,000 kgf / cm² 2 It could be.

[0077] In a specific example, the polyamide resin composition has a flexural strength of about 1,500 to about 3,500 kgf / cm² of a 6.4 mm thick specimen measured at 2.8 mm / min according to ASTM D790. 2 , for example, about 1,900 to about 3,000 kgf / cm² 2 It could be.

[0078] In a specific example, the polyamide resin composition has a flexural modulus of about 80,000 to about 200,000 kgf / cm² for a 6.4 mm thick specimen measured at 2.8 mm / min according to ASTM D790. 2 , for example, about 100,000 to about 150,000 kgf / cm² 2 It could be.

[0079] In a specific example, the polyamide resin composition is subjected to a load of 18.56 kgf / cm² in accordance with ASTM D648. 2 The heat distortion temperature (HDT) of a 6.4 mm thick specimen measured under a heating rate of 120℃ / hr may be about 180 to about 250℃, for example, about 200 to about 220℃.

[0080]

[0081] The molded article according to the present invention is formed from the polyamide resin composition. The polyamide resin composition may be manufactured in the form of pellets, and the manufactured pellets may be produced into various molded articles (products) through various molding methods such as injection molding, extrusion molding, vacuum molding, and casting molding. Such molding methods are well known to those skilled in the art to which the present invention belongs. Since the molded article exhibits excellent flame resistance, flame retardancy, impact resistance, rigidity, thermal stability, and a balance of these physical properties, it is useful as a module, pack, or bottom protection plate for electric vehicle batteries.

[0082]

[0083] The present invention is to be explained more specifically through the following examples, but these examples are for illustrative purposes only and should not be interpreted as limiting the invention.

[0084]

[0085] Examples

[0086] The specifications of each component used in the examples and comparative examples below are as follows.

[0087] (A) Aliphatic polyamide resin

[0088] Polyamide 6 (Manufacturer: HANGZHOU JUHESHUN NEW MATERIAL CO.,LTD, Product Name: J2400) was used.

[0089] (B) Glass fiber

[0090] Glass fiber with a circular cross section (Manufacturer: JUSHI, Product name: E7CS10-03-568H) was used.

[0091] (C) Glass powder

[0092] Glass powder (Manufacturer: Nihon Horo Yuyaku Co., Ltd, Product Name: RCY-LF40) was used.

[0093] (D) Kaolin

[0094] Kaolin (Manufacturer: IMERYS, Product Name: CAPIM KM FT) was used.

[0095] (E) Flame retardant

[0096] (E1) Aluminum diethyl phosphinate (Manufacturer: Chempia, Product name: X-GUARD FR-133L) was used as a phosphorus-based flame retardant.

[0097] (E2) Melamine polyphosphate (Manufacturer: Chempia, Product name: MPP-D) was used as a melamine-based flame retardant.

[0098]

[0099] Examples 1 to 13 and Comparative Examples 1 to 8

[0100] Each of the above components was added in the amounts listed in Tables 1, 2, 3, and 4 below, and pellets were prepared by extrusion at approximately 250°C. Extrusion was performed using a twin-screw extruder with L / D=36 and a diameter of 45 mm. The prepared pellets were dried at approximately 100°C for at least 4 hours, and then injection molded in a 6 oz. injection molding machine (molding temperature: approximately 260°C, mold temperature: approximately 80°C) to produce specimens. The physical properties of the prepared specimens were evaluated using the following methods, and the results are shown in Tables 1, 2, 3, and 4 below.

[0101]

[0102] Methods for measuring physical properties

[0103] (1) Evaluation of flame resistance: A butane gas torch with a flame temperature of 1,000 to 1,200°C as measured by a digital thermometer was used to radiate flames for 600 seconds onto a 2 mm thick specimen fixed at a distance of 50 mm from the torch nozzle, and the time it took for a hole to form in the specimen was measured.

[0104] (2) Flame retardancy: The flame retardancy of a 0.8 mm thick injection molded specimen was measured using the UL-94 vertical test method.

[0105] (3) Notched Izod impact strength (unit: kgf·cm / cm): The notched Izod impact strength of a 1 / 8" thick specimen was measured according to ASTM D256.

[0106] (4) Tensile strength (unit: kgf / cm²) 2 In accordance with ASTM D638, the tensile strength of a 3.2 mm thick specimen was measured under conditions of 5 mm / min.

[0107] (5) Flexural strength (unit: kgf / cm²) 2 According to ASTM D790, the flexural strength of a 6.4 mm thick specimen was measured under conditions of 2.8 mm / min.

[0108] (6) Flexural modulus (unit: kgf / cm²) 2 According to ASTM D790, the flexural modulus of a 6.4 mm thick specimen was measured under conditions of 2.8 mm / min.

[0109] (7) Heat distortion temperature (HDT, unit: ℃): According to ASTM D648, load 18.56 kgf / cm 2 The heat deformation temperature of a 6.4 mm thick specimen was measured under conditions of a heating rate of 120℃ / hr.

[0110]

[0111] Example 12345(A) (parts by weight) 100 100 100 100 100 (B) (parts by weight) 77.8 100 128.6 100 100 (C) (parts by weight) 50 50 50 44.4 57.1 (D) (parts by weight) 12.5 12.5 12.5 12.5 12.5 (E1) (parts by weight) 25 25 25 25 25 (E2) (parts by weight) 55 55 5 Hole occurrence time not occurring not occurring not occurring not occurring not occurring not occurring Flame retardancy V-0 V-0 V-0 V-0 V-0 V Notch Izod Impact Strength 5.6 6.1 6.8 6.4 5.7 Tensile Strength 1,490 1,590 1,700 1,600 1,610 Flexural Strength 2,100 2,200 2,370 2,340 2,250 Flexural Modulus 114,000 120,000 134,000 131,000 122,000 Thermal Deformation Temperature 210 210 215 210 211

[0112]

[0113] Example 6789(A) (parts by weight) 100 100 100 100 (B) (parts by weight) 100 100 100 100 (C) (parts by weight) 50 50 50 50 (D) (parts by weight) 11.1 25 12.5 12.5 (E1) (parts by weight) 25 25 22.5 30 (E2) (parts by weight) 55 55 5 Hole occurrence time None None None None None Flame retardancy V-0 V-0 V-0 V-0 Notch Izod Impact strength 6.3 5.7 6.3 5.3 Tensile strength 1,600 1,550 1,600 1,550 Flexural strength 2,200 2,090 2,300 2,200 Flexural modulus 12 3,000 11 2,000 13 0,000 13 0,000 Thermal deformation Temperature 209209210209

[0114]

[0115] Example 10111213(A) (parts by weight) 100100100100(B) (parts by weight) 100100128.6100(C) (parts by weight) 505057.150(D) (parts by weight) 12.512.514.312.5(E1) (parts by weight) 25253040(E2) (parts by weight) 464-hole occurrence time not occurring not occurring not occurring not occurring flame retardancy V-0V-0V-0V-0 Notch Izod Impact Strength 6.5 5.7 6.3 5.4 Tensile Strength 1,600 1,500 1,550 1,700 Flexural Strength 2,200 2,000 2,150 2,300 Flexural Modulus 120,000 125,000 129,000 130,000 Thermal Deformation Temperature 209 209 209 210

[0116]

[0117] Comparative Example 1234(A) (parts by weight) 100 100 100 100(B) (parts by weight) 60 140 100 100(C) (parts by weight) 50 50 30 70(D) (parts by weight) 12.5 12.5 12.5 12.5 (E1) (parts by weight) 25 25 25 25(E2) (parts by weight) 55 55 Hole occurrence time 150 sec No occurrence 100 sec 500 sec Flame retardancy V-0 V-1 V-0 V-0 Notch Izod Impact strength 4.7 7.3 5.7 5.4 Tensile strength 1,200 1,800 1,300 1,200 Flexural strength 2,200 2,500 2,300 2,300 Flexural modulus 120,000 142,000 125,000 124,000 Thermal deformation Temperature 209212209209

[0118]

[0119] Comparative Example 5678(A) (parts by weight) 100 100 100 100(B) (parts by weight) 100 100 100 100(C) (parts by weight) 50 50 50 50(D) (parts by weight) 125 12.5 12.5(E1) (parts by weight) 45 45 19.5 62.6(E2) (parts by weight) 12.5 12.5 5.4 17.4 Hole occurrence time 200 seconds No occurrence 400 seconds No occurrence Flame retardancy V-0 V-0 V-1 V-0 Notch Izod Impact Strength 6.3 4.5 6.5 4.2 Tensile Strength 1,600 1,500 1,650 1,500 Flexural Strength 2,200 2,100 2,300 2,400 Flexural Modulus 1 20,000 1 15,000 1 30,000 1 4 2,000 Thermal Deformation Temperature 209 210 210 208

[0120]

[0121] From the above results, it can be seen that the polyamide resin composition of the present invention exhibits excellent flame resistance (hole occurrence time), flame retardancy (flame retardancy), impact resistance (notched Izod impact strength), stiffness (tensile strength, flexural strength, flexural modulus), thermal stability (heat distortion temperature), and the balance of these physical properties.

[0122] On the other hand, in Comparative Example 1, where the glass fiber content is less than the range of the present invention, it can be seen that flame resistance, impact resistance, and rigidity are reduced, and in Comparative Example 2, where the glass fiber content exceeds the range of the present invention, it can be seen that flame retardancy is reduced. In Comparative Example 3, where the glass powder content is less than the range of the present invention, it can be seen that flame resistance is reduced, and in Comparative Example 4, where the glass powder content exceeds the range of the present invention, it can be seen that flame resistance and rigidity are reduced. In Comparative Example 5, where the kaolin content is less than the range of the present invention, it can be seen that flame resistance is reduced, and in Comparative Example 6, where the kaolin content exceeds the range of the present invention, it can be seen that impact resistance is reduced. In addition, in Comparative Example 7, where the content of the flame retardant is less than the range of the present invention, it can be seen that flame resistance, flame retardancy, etc. are reduced, and in Comparative Example 8, where the content of the flame retardant is greater than the range of the present invention, it can be seen that impact resistance, etc. is reduced.

[0123]

[0124] The present invention has been described above with reference to embodiments. Those skilled in the art will understand that the present invention may be embodied in modified forms without departing from the essential characteristics of the invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the invention is defined by the claims, not by the foregoing description, and all variations within the scope of equivalents should be interpreted as being included in the invention.

Claims

1. 100 parts by weight of aliphatic polyamide resin; 65 to 135 parts by weight of glass fiber; 35 to 65 parts by weight of glass powder; 5 to 28 parts by weight of kaolin; and A polyamide resin composition characterized by comprising 25 to 75 parts by weight of a flame retardant comprising one or more of metal phosphinate compounds and phosphino-nitrogen compounds.

2. A polyamide resin composition according to claim 1, characterized in that the aliphatic polyamide resin comprises one or more of polyamide 6, polyamide 11, polyamide 12, polyamide 4.6, polyamide 6.6, and polyamide 6.

10.

3. A polyamide resin composition according to claim 1, wherein the glass fiber comprises at least one of the following: a glass fiber with a circular cross-section having a cross-sectional diameter of 5 to 20 μm and a length before processing of 2 to 20 mm; and a glass fiber with a rectangular cross-section having an aspect ratio (major axis of the cross-section / minor axis of the cross-section) of 1.5 to 10, a minor axis of 2 to 10 μm, and a length before processing of 2 to 20 mm.

4. A polyamide resin composition according to claim 1, characterized in that the glass powder has an average particle size (D50) of 5 to 150 μm.

5. A polyamide resin composition according to claim 1, characterized in that the kaolin has an average particle size (D50) of 1 to 50 μm.

6. A polyamide resin composition according to claim 1, characterized in that the metal phosphinate compound comprises one or more of aluminum diethyl phosphinate and zinc diethyl phosphinate.

7. A polyamide resin composition according to claim 1, characterized in that the phosphate-nitrogen compound comprises one or more of melamine polyphosphate, melamine / ammonium polyphosphate, melamine phosphate, and melamine pyrophosphate.

8. A polyamide resin composition according to claim 1, characterized in that the flame retardant is a mixture of the metal phosphinate compound and the phosphino-nitrogen compound in a weight ratio of 1:0.1 to 1:

1.

9. The polyamide resin composition according to claim 1, characterized in that no hole occurs in the specimen when a flame is radiated for 600 seconds to a specimen with a thickness of 2 mm fixed at a distance of 50 mm from the torch mouth using a butane gas torch having a flame temperature of 1,000 to 1,200°C.

10. The polyamide resin composition according to claim 1, characterized in that the flame retardancy of a 1.5 mm thick injection molded specimen measured by the UL-94 vertical test method is V-0 or higher.

11. The polyamide resin composition according to claim 1, characterized in that the polyamide resin composition has a notched Izod impact strength of 5 to 15 kgf·cm / cm of a 1 / 8" thickness specimen measured according to ASTM D256.

12. In claim 1, the polyamide resin composition has a tensile strength of 1,300 to 2,500 kgf / cm² of a 3.2 mm thick specimen measured under a 5 mm / min condition in accordance with ASTM D638. 2 A polyamide resin composition characterized by being.

13. In claim 1, the polyamide resin composition has a flexural strength of 1,500 to 3,500 kgf / cm² of a 6.4 mm thick specimen measured at 2.8 mm / min in accordance with ASTM D790. 2 And, in accordance with ASTM D790, the flexural modulus of a 6.4 mm thick specimen measured under a condition of 2.8 mm / min is 80,000 to 200,000 kgf / cm 2 A polyamide resin composition characterized by being.

14. In claim 1, the polyamide resin composition is, in accordance with ASTM D648, a load of 18.56 kgf / cm² 2 A polyamide resin composition characterized by a heat distortion temperature (HDT) of 180 to 250°C for a 6.4 mm thick specimen measured under a heating rate of 120°C / hr.

15. A molded article characterized by being formed from a polyamide resin composition according to any one of claims 1 to 14.