Flame-retardant polyamide resin composition and molded article made thereof

Abstract

[Problem] To provide a flame-retardant polyamide resin composition having little bleed-out of flame retardant and exceptional thermal discoloration resistance, moldability, snap fit of parts, etc., while having flame retardancy at the UL 94V-0 level over a wide range of thickness. [Solution] A flame-retardant polyamide resin composition characterized by: containing a polyamide resin (A) and melamine cyanurate (B); containing 90-98 parts by mass of the polyamide resin (A) and 2-10 parts by mass of the melamine cyanurate (B) relative to a total of 100 parts by mass of the components (A) and (B); being such that the proportion of a polyamide 66 resin (A1) in the polyamide resin (A) is 55-85 mass%, and the proportion of a polyamide 6 resin (A2) in the polyamide resin (A) is 15-45 mass%; and containing 0.01-1 part by mass of a phosphorus-based antioxidant (C), 0.01-1 part by mass of a hindered-phenol-based antioxidant (D), and 0.1-1 part by mass of a C22 or lower fatty acid metal-salt-based lubricant (E) relative to a total of 100 parts by mass of the components (A) and (B).

Description

[Technical Field]

[0001] The present invention relates to a non-halogen flame-retardant polyamide resin composition, particularly to a non-halogen flame-retardant polyamide resin composition that has high flame retardancy, good snap-fit ​​properties, and excellent resistance to heat discoloration. [Background technology]

[0002] Polyamide resins are used in various fields such as electrical and electronic components, automobile components, etc., taking advantage of their excellent mechanical properties, electrical properties, chemical resistance, etc. In these fields, when an unreinforced system and flame retardancy using a non-halogen flame retardant are required, melamine cyanurate is used as the flame retardant (e.g., Patent Documents 1 and 2). However, melamine cyanurate has drawbacks such as poor dispersibility in polyamide resins, and when the blending amount is large, the mechanical properties of the polyamide resin are reduced, it bleeds, and it is prone to decomposition into melamine and cyanuric acid by thermal decomposition and sublimation, and the sublimated melamine and cyanuric acid can cause silver smearing on the surface of molded articles during molding processing and can easily contaminate the surface of a mold.

[0003] In recent years, various requirements for electrical and electronic components, automotive parts, etc. have become higher, and flame retardancy at UL94 V-0 level is now required for various thicknesses. Higher levels are also desired, such as no bleeding of flame retardants, heat discoloration resistance, moldability, and even snap-fitting of parts. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 58-25379 [Patent Document 2] Special Publication No. 58-35541 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to provide a flame-retardant polyamide resin composition that has flame retardancy at the UL94V-0 level over a wide thickness range, while exhibiting little bleeding of the flame retardant and excellent heat discoloration resistance, moldability, snap-fit ​​properties of parts, etc. [Means for solving the problem]

[0006] The present inventors have conducted extensive research to solve the above problems and have completed the present invention.

[0007] That is, the present invention has the following configuration. A flame-retardant polyamide resin composition comprising a polyamide resin (A) and a melamine cyanurate (B), wherein the polyamide resin (A) is contained in an amount of 90 to 98 parts by mass and the melamine cyanurate (B) is contained in an amount of 2 to 10 parts by mass, relative to 100 parts by mass of the total of the components (A) and (B), and the composition also contains 0.01 to 1 part by mass of a phosphorus-based antioxidant (C), 0.01 to 1 part by mass of a hindered phenol-based antioxidant (D), and 0.1 to 1 part by mass of a fatty acid metal salt-based lubricant having 22 or less carbon atoms (E), wherein the polyamide resin (A) contains 55 to 85% by mass of a polyamide 66 resin (A1) and 15 to 45% by mass of a polyamide 6 resin (A2). [2] The flame-retardant polyamide resin composition according to [1], wherein the fatty acid metal salt-based lubricant (E) is a metal salt of stearic acid. [3] A molded article made of the flame-retardant polyamide resin composition according to any one of [1] to [2]. [4] The molded product according to [3], wherein the molded product is any one of a ferrite core cover, an SC lock, a cable tie, and an electrical wiring protection member. [Effects of the Invention]

[0008] The flame-retardant polyamide resin composition of the present invention not only has excellent heat discoloration resistance and moldability, but also has flame retardancy at the UL94V-0 level over a wide thickness range without significantly impairing breaking strength and toughness. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be specifically described below. [Polyamide resin (A)] The polyamide resin (A) in the present invention is not particularly limited as long as it is a polymer having an amide bond (-NHCO-) ​​in the main chain. The polyamide resin (A) is preferably crystalline, and examples thereof include polyamide 6 (PA6), polyamide 66 (PA66), polyamide 46 (PA46), polyamide 11 (PA11), polyamide 12 (PA12), polyamide 610 (PA610), polyamide 612 (PA612), polymetaxylylene adipamide (PAMXD6), hexamethylenediamine-terephthalic acid polymer (PA6T), hexamethylenediamine-terephthalic acid and adipic acid polymer (PA6T / 66), hexamethylenediamine-terephthalic acid and ε Examples include, but are not limited to, crystalline polyamide resins such as caprolactam copolymer (PA6T / 6), trimethylhexamethylenediamine-terephthalic acid polymer (PATMD-T), metaxylylenediamine, adipic acid, and isophthalic acid copolymer (PAMXD6 / MXDI), trihexamethylenediamine, terephthalic acid, and ε-caprolactam copolymer (PATMDT / 6), and diaminodicyclohexylenemethane, isophthalic acid, and lauryllactam copolymer, or blends thereof.

[0010] The amount (content) of the polyamide resin (A) is 90 to 98 parts by mass when the total amount of the polyamide resin (A) and the melamine cyanurate (B) is 100 parts by mass. When the amount of the polyamide resin (A) is within this range, bleeding of the flame retardant can be suppressed and high flame retardancy can be maintained in the composition. The amount (content) of the polyamide resin (A) is preferably 92 to 96 parts by mass, more preferably 93 to 95 parts by mass. In the flame-retardant polyamide resin composition of the present invention, the amount of each component is the content itself.

[0011] In view of excellent moldability, melt flowability, and flame retardancy, the polyamide resin (A) in the present invention is preferably a mixture of polyamide 66 resin (A1) and polyamide 6 resin (A2).

[0012] The polyamide 66 resin (A1) in the present invention may be a polyamide 66 resin obtained by polycondensation of adipic acid and hexamethylenediamine as raw materials. The relative viscosity of the polyamide 66 resin (A-1) is preferably 2.2 to 3.5, as measured in accordance with JIS K6810 at a concentration of 1% in 98% sulfuric acid at 25°C. If the relative viscosity is less than 2.2, the mechanical properties tend to deteriorate, and if it exceeds 3.5, the melt fluidity tends to be insufficient. The relative viscosity of the polyamide 66 resin (A1) is more preferably 2.3 to 3.0. The polyamide 66 resin (A1) may be adjusted to a preferred relative viscosity range by mixing polyamide 66 resins having different relative viscosities.

[0013] The terminal amino group concentration of the polyamide 66 resin (A1) is not particularly limited, but is preferably 50 to 90 eq / ton, and more preferably 60 to 80 eq / ton in terms of heat discoloration resistance.

[0014] The blending amount of polyamide 66 resin (A1) is preferably 55 to 85 parts by mass per 100 parts by mass of polyamide resin (A). If the blending amount of polyamide 66 resin (A1) exceeds 85 parts by mass, hinge properties (snap-fit ​​properties) decrease, while if it is less than 50 parts by mass, moldability tends to decrease. The blending amount of polyamide 66 resin (A1) is more preferably 60 to 80 parts by mass in terms of the balance between snap-fit ​​properties and moldability.

[0015] The polyamide 6 resin (A2) in the present invention is a polyamide 6 resin obtained by polycondensation using ε-caprolactam as a raw material. The relative viscosity of the polyamide 6 resin (A2) is preferably 1.5 to 4.0, as measured in 98% sulfuric acid at a concentration of 1% and a temperature of 25°C according to JIS K6810. If the relative viscosity is less than 1.5, mechanical properties tend to deteriorate, and if it exceeds 3.6, flame retardancy and flowability tend to be impaired. The relative viscosity of the polyamide 6 resin (A2) is more preferably 1.8 to 3.6. The polyamide 6 resin (A-2) may be adjusted to a preferred relative viscosity range by mixing polyamide 6 resins having different relative viscosities.

[0016] The terminal amino group concentration of the polyamide 6 resin (A2) is not particularly limited, but is preferably 50 to 90 eq / ton, and more preferably 60 to 80 eq / ton in terms of heat discoloration resistance.

[0017] The blending amount of polyamide 6 resin (A2) is preferably 15 to 45 parts by mass per 100 parts by mass of polyamide resin (A). If the blending amount of polyamide 6 resin (A2) is less than 15 parts by mass, hinge properties (snap-fit ​​properties) tend to decrease, while if it exceeds 45 parts by mass, molding processability tends to decrease. The blending amount of polyamide 6 resin (A2) is more preferably 20 to 40 parts by mass in terms of the balance between snap-fit ​​properties and molding processability.

[0018] In order to improve the appearance of the molded article, an amorphous polyamide resin (A3) may also be blended. Examples of amorphous polyamide resins include polymers, copolymers, and blends obtained by polycondensation of diamines such as 4,4'-diamino-3,3'-dimethyldicyclohexylmethane (CA), 4,4'-diaminodicyclohexylmethane (PACM), metaxylylenediamine (MXD), trimethylhexamethylenediamine (TMD), isophoronediamine (IA), 4,4'-diaminodicyclohexylpropane (PACP), and hexamethylenediamine with dicarboxylic acids such as terphthalic acid, isophthalic acid, adipic acid, sebacic acid, and dodecanedicarboxylic acid, and lactams such as caprolactam and lauryllactam. The amount of amorphous polyamide resin (A3) blended is preferably 0 to 15 parts by mass in terms of the balance between snap fit properties and moldability.

[0019] [Melamine cyanurate (B)] The melamine cyanurate (B) in the present invention is preferably an equimolar reaction product of cyanuric acid and melamine. Furthermore, some of the amino groups or hydroxyl groups in the melamine cyanurate may be substituted with other substituents. Melamine cyanurate can be obtained, for example, by mixing an aqueous solution of cyanuric acid with an aqueous solution of melamine, reacting them under stirring at 90 to 100°C, and filtering the resulting precipitate. The resulting solid can be used as is, but it is preferably pulverized as needed before use. The particle size is not particularly limited, but from the viewpoints of flame retardancy and toughness, the average particle size is preferably 0.5 to 20 μm, more preferably 1 to 15 μm.

[0020] The blending amount (content) of the melamine cyanurate (B) is 2 to 10 parts by mass when the total of the polyamide resin (A) and the melamine cyanurate (B) is 100 parts by mass. From the viewpoint of flame retardancy, it is 2 parts by mass or more, and from the viewpoint of snap fit and bleeding, it is 10 parts by mass or less. It is more preferably 3 to 9 parts by mass, and even more preferably 4 to 8 parts by mass.

[0021] [Phosphorus-based antioxidant (C)] The phosphorus-based antioxidant (C) in the present invention may be an inorganic compound or an organic compound, and is not particularly limited. Preferred phosphorus-based compounds include inorganic phosphates such as monosodium phosphate, disodium phosphate, trisodium phosphate, sodium phosphite, calcium phosphite, magnesium phosphite, and manganese phosphite, triphenyl phosphite, trioctadecyl phosphite, tridecyl phosphite, triisodecyl phosphite, trinonylphenyl phosphite, diphenylisodecyl phosphite, diphenyl alkyl phosphite, phenyl dialkyl phosphite, tris(nonylphenyl) phosphite, trilauryl phosphite, distearyl pentaerythritol diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, diisodecyl pentaerythritol diphosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, di Isodecyloxypentaerythritol diphosphite, bis(2,4-di-tert-butyl-6-methylphenyl)pentaerythritol diphosphite, bis(2,4,6-tris(tert-butylphenyl))pentaerythritol diphosphite, tristearyl sorbitol triphosphite, tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylene diphosphonite, 6-isooctyloxy-2,4,8,10-tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylene diphosphonite Examples include tetra-tert-butyl-12H-dibenzo[d,g]-1,3,2-dioxaphosphocin, 6-fluoro-2,4,8,10-tetra-tert-butyl-12-methyl-dibenzo[d,g]-1,3,2-dioxaphosphocin, bis(2,4-di-tert-butyl-6-methylphenyl)methyl phosphite, and bis(2,4-di-tert-butyl-6-methylphenyl)ethyl phosphite, which are added to improve resistance to heat discoloration.

[0022] The phosphorus-based antioxidant (C) is preferably a phosphite compound, and among the phosphite compounds, a compound having a pentaerythritol diphosphite skeleton is preferred. Specifically, those having a pentaerythritol diphosphite skeleton and a molecular weight of about 600 to 800, such as bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite ("ADK STAB PEP-36", molecular weight 633), bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite ("ADK STAB PEP-24G", molecular weight 604), distearyl pentaerythritol diphosphite ("ADK STAB PEP-8", molecular weight 733), and bis(nonylphenyl)pentaerythritol diphosphite ("ADK STAB PEP-4C", molecular weight 633), are particularly preferred because they can further improve mold releasability without reducing flame retardancy and are also suitable for snap-fit ​​properties.

[0023] The blending amount (content) of the phosphorus-based antioxidant (C) is 0.01 to 1 part by mass when the total of the polyamide resin (A) and the melamine cyanurate (B) is 100 parts by mass. When the blending amount of the phosphorus-based antioxidant (C) is within this range, discoloration during extrusion processing can be suppressed and secondary oxidative deterioration due to phosphorus-derived radicals can be prevented. The blending amount of the phosphorus-based antioxidant (C) is preferably 0.1 to 0.5 parts by mass.

[0024] [Hindered phenolic antioxidants (D)] Examples of the hindered phenol-based antioxidant (D) in the present invention include N,N'-hexamethylene-bis-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide, bis(3,3-bis-(4'-hydroxy-3'-tert-butylphenyl)butanoic acid) glycol ester, 2,1'-thioethyl bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 4,4'-butylidene-bis(3-methyl-6-tert-butylphenol), triethylene glycol-3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate "SONGNOX2450", molecular weight 633), and mixtures of two or more of these can also be used.

[0025] The amount (content) of the hindered phenol-based antioxidant (D) is 0.01 to 1 part by mass when the total of the polyamide resin (A) and the melamine cyanurate (B) is 100 parts by mass. When the amount of the hindered phenol-based antioxidant (D) is within this range, oxidative degradation over time can be prevented with an appropriate amount according to the coordinate bond of the polyamide composition. The amount of the hindered phenol-based antioxidant (D) is preferably 0.1 to 0.5 parts by mass.

[0026] [Fatty acid metal salt lubricant with 22 or less carbon atoms (E)] Examples of the fatty acid metal salt-based lubricant (E) having 22 or less carbon atoms in the present invention include metal salts of fatty acids such as stearic acid, palmitic acid, and behenic acid. The use of a fatty acid metal salt-based lubricant having 22 or less carbon atoms not only improves releasability, but also tends to further improve flame retardancy, since the temperature at which combustion gas derived from the fatty acid starts to be generated during combustion is close to the temperature at which non-combustible gas generated by decomposition of melamine cyanurate starts to be generated, preventing ignition of the combustible gas.

[0027] Metal salts of aliphatic carboxylic acids having 18 or fewer carbon atoms are more preferred, and alkali metal or alkaline earth metal salts of stearic acid, palmitic acid, etc. are more preferred because they provide both mold releasability and flame retardancy. Examples of alkali metal or alkaline earth metal salts include lithium, sodium, magnesium, and calcium salts. In particular, alkali metal or alkaline earth metal salts of stearic acid are optimal because, during combustion, the temperature at which combustible gases derived from fatty acids resulting from the decomposition of fatty acid metal salts and non-combustible gases resulting from the decomposition of melamine cyanurate begin to be generated is the same, allowing for improved mold releasability without a decrease in flame retardancy due to their addition.

[0028] The amount (content) of the fatty acid metal salt lubricant (E) is 0.1 to 1 part by mass when the total of the polyamide resin (A) and the melamine cyanurate (B) is 100 parts by mass. If the amount exceeds 1 part by mass, the flame retardancy may decrease. The amount of the fatty acid metal salt lubricant (E) is preferably 0.2 to 0.8 parts by mass.

[0029] [Other ingredients] In addition to the above-mentioned (A), (B), (C), (D), and (E), other components, such as colorants such as pigments and dyes, additives such as heat stabilizers, weather resistance improvers, nucleating agents, plasticizers, mold release agents, and antistatic agents, other resin polymers, etc., may be added to the flame-retardant polyamide resin composition of the present invention, provided that the objects of the present invention are not impaired. The total amount of the above-mentioned (A), (B), (C), (D), and (E) components preferably accounts for 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more of the flame-retardant polyamide resin composition of the present invention.

[0030] Suitable molded parts obtainable using the flame-retardant polyamide resin composition of the present invention include molded parts such as connectors, coil bobbins, breakers, electromagnetic switches, holders, plugs, sockets, switches, cases, and covers used in the fields of electric and electronic parts, automobile parts, etc., and more specifically, parts that require heat discoloration resistance and snap fit properties, such as ferrite core covers, SC locks, cable ties, and electrical wiring protection members.

[0031] The method for producing the flame-retardant polyamide resin composition of the present invention is not particularly limited, and a general single-screw extruder, twin-screw extruder, pressure kneader, etc. can be used as a kneading device, but a twin-screw extruder is particularly preferred in the present invention. In one embodiment, the above-mentioned (A), (B), (C), (D), and (E) and, depending on the application, a pigment, etc. are mixed and charged into a twin-screw extruder. By uniformly kneading using a twin-screw extruder, a polyamide-based resin composition with excellent toughness and flame retardancy can be produced. The kneading temperature of the twin-screw extruder is preferably 220 to 300°C, and the kneading time is preferably about 2 to 15 minutes. [Example]

[0032] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples in any way.

[0033] The following components were used: Polyamide resin (A); A1-1: Polyamide 66 (RV=2.8) Vydyne 21Z (manufactured by Ascend), melting point 265°C A1-2: Polyamide 66 (RV=2.4) EPR24 (manufactured by Shanghai Shenma Plastic Technology Co., Ltd.), melting point 265℃ A2-1: Polyamide 6 (RV=2.0) M2000 (manufactured by MEIDA), melting point 225°C A2-2: Polyamide 6 (RV=3.6) ZISAMIDE TP6603 (manufactured by Shuseisha), melting point 225°C

[0034] Melamine cyanurate (B); B: MC6000 (Nissan Chemical Co., Ltd.)

[0035] Phosphorus-based antioxidant (C); C: ADK STAB PEP-36 (ADEKA Corporation)

[0036] hindered phenolic antioxidants (D); D: SONGNOX2450 (Songwon International Japan)

[0037] Fatty acid metal salt lubricant (E); E1: Magnesium stearate NP-1500S (manufactured by Tannan Chemical Industry Co., Ltd.) Other release agents; E2: Calcium montanate CS-8-CP (manufactured by Nitto Kasei Kogyo Co., Ltd.) E3: Fatty acid ester Ricorb WE-40 (Clariant Japan Co., Ltd.)

[0038] [Examples 1 to 12, Comparative Examples 1 to 7] To produce the evaluation samples, the raw materials were weighed out in the blending ratio of the polyamide resin composition shown in Table 1, mixed in a tumbler, and then fed into a twin-screw extruder. The twin-screw extruder was set at a temperature of 250°C to 300°C, and the kneading time was 5 to 10 minutes. The resulting pellets were molded into various evaluation samples using an injection molding machine. The cylinder temperature of the injection molding machine was set at 250°C to 280°C, and the mold temperature was 80°C.

[0039] The various evaluation methods are as follows. The evaluation results are shown in Table 1. 1. Relative viscosity [RV] of polyamide resin (98% sulfuric acid solution method) Using an Ubbelohde viscosity tube, measurements were made at 25°C in a 98% by mass sulfuric acid solution with a polyamide resin concentration of 1 g / dL. 2. Melting point of polyamide resin Measurement was carried out using a differential scanning calorimeter EXSTAR 6000 manufactured by Seiko Instruments Inc. at a temperature rise rate of 20°C / min, and the peak top temperature of the endothermic peak was determined as the melting point. 3. Snap fit property (tensile strength, tensile elongation): Measured in accordance with ISO527 to determine tensile strength (tensile strength) and tensile elongation (tensile breaking strain). 4. Flammability: Measured according to UL94 vertical flame test. V-0 indicates the highest flame retardancy. 5. Bleeding properties: A 100mm x 100mm molded product with a thickness of 2mm was left to stand for 96 hours in a constant temperature and humidity chamber set at a temperature of 80°C and 95% RH, and this was repeated at least twice.The product was then returned to room temperature and visually inspected with a stereomicroscope to see if there were any precipitates on the surface. 6. Thermal discoloration: The color difference (ΔE) between the pellets after leaving them in an oven at 120°C for 8 hours and the pellets before treatment was calculated. 7. Moldability: Molding was carried out under the above molding temperature conditions using a mold equipped with a mold release force measuring device, and the mold release force was measured from the 31st to 35th shots to determine the mold release resistance value.

[0040] [Table 1]

[0041] Examples 1 to 12 have tensile strengths equivalent to those of general polyamide 6,66 resins, tensile elongations of 5% or more, and do not break even when the tensile yield point is exceeded. Since they are not significantly embrittled, good snap-fit ​​properties are expected. In terms of flame retardancy at thicknesses of 0.4, 0.8, 1.6, and 3.0 mm, Examples 1 to 12 achieved a UL94 V-0 rating, demonstrating high flame retardancy across a wide range of thicknesses. In terms of thermal discoloration, Examples 1 to 12 had a ΔE of 20 or less after 8 hours at 120°C, demonstrating suppressed discoloration in a thermal environment. In terms of moldability, the molded article had a mold release resistance of 1 MPa or less, meaning that the composition is highly unlikely to undergo deformation or adhesion during mold release, even during continuous molding.

[0042] On the other hand, while Comparative Examples 1 to 7 partially satisfy the characteristics, Comparative Example 1 is not preferred because its flame retardancy is significantly reduced, with a UL94 V-2 rating at thicknesses of 0.4, 0.8, 1.6, and 3.0 mm. Comparative Example 2 is not preferred because its tensile elongation is 3%, failing to suppress embrittlement. Comparative Example 3 is not preferred because its flame retardancy is rated V-2 at thicknesses of 0.4, 0.8, 1.6, and 3.0 mm, and its tensile elongation is 3%, which makes it difficult to achieve both sufficient flame retardancy and snap fit. Comparative Examples 4, 5, and 7 are not preferred because their flame retardancy is rated UL94 V-2 at thicknesses of 0.8, 1.6, and 3.0 mm, making it difficult to achieve high flame retardancy over a wide range of thicknesses. In addition, Comparative Example 7 has a mold release resistance value, which is an indicator of moldability, exceeding 1 MPa, which means that its moldability (good mold release properties) cannot be said to be good, and is also not preferred in this respect. Finally, Comparative Example 6 was rated UL94 V-2 for flame retardancy at thicknesses of 0.8, 1.6, and 3.0 mm, and in addition, the tensile elongation was 3%, which is not preferable as it cannot be said to have both sufficient flame retardancy and snap fit properties. [Industrial Applicability]

[0043] The flame-retardant polyamide resin composition of the present invention is suitable for molded articles having a wide range of product thicknesses and having hinge portions. The obtained molded articles have high flame retardancy over a wide range of product thicknesses and also have excellent snap-fit ​​properties, so they can be suitably used for electrical and electronic parts, automotive parts, and the like, where both high flame retardancy and snap-fit ​​properties are desired.

Claims

1. A flame-retardant polyamide resin composition comprising a polyamide resin (A) and a melamine cyanurate (B), wherein the polyamide resin (A) is 92 to 98 parts by mass, the melamine cyanurate (B) is 2 to 8 parts by mass, the phosphorus-based antioxidant (C) is 0.01 to 1 part by mass, the hindered phenol-based antioxidant (D) is 0.01 to 1 part by mass, and the fatty acid alkali metal or alkaline earth metal salt-based lubricant having 22 or less carbon atoms is 0.1 to 1 part by mass, relative to 100 parts by mass of the total of the components (A) and (B), and the polyamide resin (A) contains 55 to 85% by mass of a polyamide 66 resin (A1) and 15 to 45% by mass of a polyamide 6 resin (A2), the total amount of the components (A), (B), (C), (D), and (E) in the flame-retardant polyamide resin composition is 80 mass% or more; A flame-retardant polyamide resin composition, when containing other components in addition to the components (A), (B), (C), (D), and (E), the other components are at least one selected from the group consisting of colorants, heat stabilizers, weather resistance improvers, nucleating agents, plasticizers, release agents, antistatic agents, and resin polymers other than the component (A).

2. A flame-retardant polyamide resin composition as described in Claim 1, wherein the fatty acid metal salt-based lubricant (E) is a fatty acid alkali metal or alkaline earth metal salt-based lubricant (E) having 21 or less carbon atoms.

3. 3. The flame-retardant polyamide resin composition according to claim 1, wherein the fatty acid metal salt-based lubricant (E) is a metal salt of stearic acid.

4. A molded article made from the flame-retardant polyamide resin composition according to any one of claims 1 to 3.

5. 5. The molded product according to claim 4, which is any one of a ferrite core cover, an SC lock, a cable tie, and an electric wiring protection member.

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