Polyamide composition, process for its preparation and use thereof

Abstract

This invention discloses a polyamide composition, its preparation method, and its application, belonging to the field of polymer materials technology. The polyamide composition uses melamine cyanurate as a halogen-free flame retardant in the product, while compounding organic colorants with specific pH and introducing fluorescent whitening agents. This not only makes the flame retardant components of the product highly stable and less prone to thermal precipitation under thermal conditions, but also minimizes the color difference of the product after heating and baking. During mass production and processing, batch-to-batch color stability control can be achieved.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a polyamide composition, its preparation method, and its application. Background Technology

[0002] Polyamide materials (such as PA6 and PA66) possess mechanical strength and electrical insulation properties, making them widely used in the electronics and electrical appliance industries. To ensure the flame retardancy of products, flame retardants are often added to polyamide materials, and for environmental and safety reasons, these flame retardants are primarily halogen-free. However, when existing polyamide materials containing halogen-free flame retardants are further incorporating colorants, especially more vibrant and diverse organic colorants, the interaction or compatibility issues between the halogen-free flame retardants and organic colorants can lead to problems. Besides causing the halogen-free flame retardants to easily precipitate out when heated, affecting the flame retardant life, the products may also exhibit discoloration during the manufacturing process of electronic and electrical components due to heating and baking processes (such as coating and thermosetting of electronic components). This results in significant color differences between batches, making it difficult to effectively control the product's appearance quality. Summary of the Invention

[0003] Based on the deficiencies of existing technologies, the present invention aims to provide a polyamide composition that uses melamine cyanurate as a halogen-free flame retardant in the product, while compounding organic colorants with specific pH levels and introducing fluorescent whitening agents. This not only makes the flame retardant components of the product highly stable and reduces thermal precipitation under thermal conditions, but also minimizes color differences in the product's appearance after heating and baking. During mass production and processing, batch-to-batch color stability control can be achieved.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A polyamide composition comprising the following components in parts by weight: 50-90 parts of polyamide resin, 10-40 parts of halogen-free flame retardant, 0.1-1 parts of organic colorant, and 0.1-1 parts of fluorescent whitening agent; The halogen-free flame retardant includes melamine cyanurate; The pH of the organic colorant is 7 to 7.8.

[0005] Existing polyamide materials, especially halogen-free flame-retardant systems, often exhibit precipitation of the halogen-free flame retardant upon heating due to interactions, chemical activity, or compatibility issues between the halogen-free flame retardant and the polyamide resin, or between the halogen-free flame retardant and the organic colorant. This affects the subsequent flame-retardant effectiveness. On the other hand, due to the instability and low compatibility of organic colorants in the product system, the appearance color of the product changes to varying degrees during the manufacturing process of electronic and electrical components, especially during heating and baking processes. The significant color difference makes it difficult to achieve stable control over the appearance effect between different batches of the product. Therefore, in the technical solution of this invention, the product introduces melamine cyanurate (MCA) as a halogen-free flame retardant into polyamide resin, and simultaneously introduces organic colorants and fluorescent whitening agents as coloring components. Furthermore, the pH of the organic colorant is controlled. Because melamine cyanurate (MCA) has good thermal stability and high compatibility with polyamide resin, it exhibits less exudation under thermal conditions. Simultaneously, by matching the organic colorant with a specific pH value to the internal environment of MCA within the polyamide resin, the chemical activity between the colorant and MCA or its catalytic activity on other components can be effectively reduced, while simultaneously enhancing the performance of the halogen-free flame retardant and the organic colorant. The compatibility of the components avoids the precipitation of each component, especially the halogen-free flame retardant, under thermal conditions due to the interaction between components. On the other hand, the organic colorant will not suffer from serious irreversible color changes during product processing and baking due to the influence of components (such as degradation of the organic colorant due to environmental catalysis of components, or degradation of components such as MCA, which will generate byproducts that react with the organic colorant). After the yellowing and whitening are achieved together with the fluorescent whitening agent, the color difference of the product after baking and other heat processing can still be maintained at a small level compared with the appearance before processing, which can achieve good control of the stability of the production appearance color.

[0006] If other types of halogen-free flame retardants or organic colorants with unsuitable pH are chosen, in addition to the difficulty in ensuring the low leaching of halogen-free flame retardants in the product, the appearance color will also be affected, making it impossible to meet the effective application requirements of the product in the preparation of electronic and electrical components.

[0007] In some embodiments, the polyamide resin is in the range of 50 parts by weight, 55 parts by weight, 60 parts by weight, 65 parts by weight, 70 parts by weight, 75 parts by weight, 80 parts by weight, 85 parts by weight, or any two of the following: the halogen-free flame retardant is in the range of 10 parts by weight, 15 parts by weight, 18 parts by weight, 20 parts by weight, 25 parts by weight, 30 parts by weight, 35 parts by weight, or 40 parts by weight; the organic colorant is in the range of 0.1 parts by weight, 0.2 parts by weight, 0.5 parts by weight, 0.6 parts by weight, 0.8 parts by weight, or any two of the following: the optical brightener is in the range of 0.1 parts by weight, 0.2 parts by weight, 0.5 parts by weight, 0.6 parts by weight, 0.8 parts by weight, or any two of the following: the optical brightener is in the range of 0.1 parts by weight, 0.2 parts by weight, 0.5 parts by weight, 0.6 parts by weight, 0.8 parts by weight, or 1 part by weight.

[0008] More preferably, the polyamide composition comprises the following components in parts by weight: The mixture contains 80-90 parts of polyamide resin, 10-20 parts of halogen-free flame retardant, 0.2-0.8 parts of organic colorant, and 0.1-0.5 parts of fluorescent whitening agent.

[0009] More preferably, the polyamide resin has a mass content of ≥50wt% in the polyamide composition.

[0010] More preferably, the halogen-free flame retardant has a mass content of ≥5 wt% in the polyamide composition.

[0011] More preferably, the organic colorant has a mass content of ≤5 wt% in the polyamide composition.

[0012] Given the flame retardant requirements and flame retardant effectiveness requirements of the product, those skilled in the art can adjust the weight ratio of polyamide resin and halogen-free flame retardant in the product. There are no limitations on this, as long as it does not affect the interaction between the halogen-free flame retardant and the organic colorant. Under the premise of ensuring intrinsic flame retardancy and color development effect, it can also have the expected low exudation and high color stability, which are both acceptable.

[0013] Preferably, the polyamide resin includes at least one of aliphatic polyamide resin and semi-aromatic polyamide resin.

[0014] More preferably, the aliphatic polyamide resin includes at least one of PA6 (polycaprolactam) resin, PA66 (polyhexamethylene adipamide) resin, PA610 (polyhexamethylene decanedioamide) resin, and PA612 (polyhexamethylene dodecyl diamide) resin, and the semi-aromatic polyamide resin includes at least one of PA6T (polyhexamethylene terephthalamide) resin, PA9T (polynonyl terephthalamide) resin, and PA10T (polydecyl terephthalamide) resin.

[0015] More preferably, the polyamide resin includes at least one of PA6 resin, PA66 resin, PA6T resin, and PA9T resin.

[0016] Preferably, the polyamide resin has a viscosity of 2 to 4.5 at 25°C according to ISO 307-2007 (test solvent: 96% concentrated hydrochloric acid, test concentration: 1%).

[0017] More preferably, the polyamide resin has a relative viscosity of 2.2 to 2.8 at 25°C.

[0018] In the technical solution of this invention, the viscosity of the polyamide resin is not specifically limited. Those skilled in the art can select a polyamide resin of appropriate viscosity to construct the matrix resin according to the mechanical, flame retardant and other requirements of the product. As long as it does not affect the low exudation of components and the color stability of the product, it is not limited.

[0019] Preferably, the organic colorant includes at least one of yellow, blue, red, purple, green, and cyan colorants.

[0020] Preferably, the organic colorant includes at least one of azo colorants, benzimidazole ketone colorants, cyanine colorants, phthalocyanine colorants, triarylmethane colorants, anthraquinone colorants, acridine colorants, and perylene colorants.

[0021] More preferably, the azo colorant includes at least one of 2,2'-[1,2-ethylenedi(oxy-2,1-phenyleneazo)]bis[N-(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl]-3-oxo-butyramide, 2-[(4-chloro-2-nitrobenzene)azo]-N-(2-methoxyphenyl)-3-oxobutyramide, the benzimidazolone colorant includes at least one of 9-methoxy-7H-benzimidazol[2,1-A]benzo[DE]isoquinolinyl-7-one, 3-[[4-[(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)amino]phenyl]azo]-6-hydroxy-2-naphthalenesulfonic acid calcium salt, and the cyanine colorant includes 3-ethyl-2-[(3-ethyl-2- (3H)-benzothiazolium-1,3-methyl]benzothiazolium iodide salt, phthalocyanine colorants including copper phthalocyanine, triarylmethane colorants including 4,4',4''-tris(dimethylamino)tribenzyl alcohol hydrochloride, acridine colorants including 3,6-diamino-2,7-dimethylacridine, perylene colorants including N,N'-di(3,5-dimethylphenyl)perylene-3,4,9,10-tetracarboxylic acid diimide, anthraquinone colorants including 1,8-bis[(4-methylphenyl)amino]anthraquinone.

[0022] Preferably, the pH of the organic colorant is within the range of one or both of 7, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, and 7.8.

[0023] More preferably, the pH of the organic colorant is 7.3 to 7.6.

[0024] It should be noted that the pH of the organic colorant described in this invention is tested with reference to pH GB / T 5211.6-2020, and the reagent solution used in the test is deionized water with a test concentration of 1%.

[0025] As mentioned above, the selection of halogen-free flame retardant and organic colorant is crucial in the product of this invention. Only by selecting halogen-free flame retardant MCA in combination with organic colorant within a specific pH range can the product achieve low flame retardant component release and high color stability while ensuring flame retardancy. If the pH of the organic colorant is too low or too high, the chemical inertness and compatibility between the two will deteriorate, making it difficult to achieve the expected effect. Furthermore, when the pH of the organic colorant is further optimized to be within the range of 7.3 to 7.6, the overall performance of the product is even better.

[0026] More preferably, the pH of the MCA is 5-7.

[0027] It should be noted that the pH test method for MCA described in this invention is the same as that for organic colorants, and the test is performed in accordance with pH GB / T5211.6-2020. The reagent solution used in the test is deionized water, and the test concentration is 1%.

[0028] Preferably, the fluorescent whitening agent includes at least one of benzoxazole fluorescent whitening agents, stilbene fluorescent whitening agents, and pyrazoline fluorescent whitening agents.

[0029] More preferably, the fluorescent whitening agent is a benzoxazole fluorescent whitening agent.

[0030] More preferably, the benzoxazole fluorescent whitening agent comprises at least one of 2,2'-[(1,2-ethylidene di(4,1-phenylene)]bisbenzoxazole, 1,4-bis(benzoxazolyl-2-yl)naphthalene, and 4,4'-bis(5-methyl-2-benzoxazolyl)stilbene, wherein the stilbene fluorescent whitening agent comprises 4,4'-bis[(4-amino-6-hydroxyethylamino-1,3,5-triazin-2-yl)amino]stilbene- Disodium 2,2'-disulfonate, 4,4'-bis[(4-amino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonate, wherein the pyrazoline fluorescent whitening agent comprises at least one of 4,4'-bis[[4-phenylamino-6-[(2-carbamoylethyl)(2-hydroxyethyl)amino]-1,3,5-triazin-2-yl]amino]-2,2'-stilbene disulfonate, 1,3-diphenyl-5-(4-dimethylaminophenyl)-2-pyrazoline, 1-(4-chlorophenyl)-3-(4-dimethylaminophenyl)-5-(4-chlorophenyl)-2-pyrazoline, 1,3-bis(2-naphthyl)-5-(4-dimethylaminophenyl)-2-pyrazoline, 1-(4-sulfophenyl)-3-(4-dimethylaminophenyl)-5-phenyl- At least one of the 2-pyrazoline sodium salts.

[0031] In the product of this invention, the main function of the fluorescent whitening agent is to work synergistically with the organic colorant to assist in the yellowing and whitening effect during the heating and baking process, thereby reducing the color difference of the product before and after heat processing. On this basis, MCA itself is a white crystalline powder. The combination of benzoxazole whitening agent and MCA can further suppress the degree of color change of the product after heat processing based on the dual synergistic effect of physical covering and optical whitening, resulting in a smaller color difference.

[0032] Preferably, the polyamide composition further includes 0.1 to 2 parts of antioxidant.

[0033] More preferably, the antioxidant includes at least one of hindered phenolic antioxidants, phosphite antioxidants, and hindered amine antioxidants.

[0034] Preferably, the components of the polyamide composition may also include, but are not limited to, processing aids such as antistatic agents, flame retardants, and lubricants. Based on the processing or actual use needs of those skilled in the art, other types of functional aids may be added without affecting the expected performance of the product. For example, the above-mentioned aids can improve the antistatic ability, flame retardancy, and demolding efficiency of the product without affecting its characteristic properties. That is, the description of the product components in the technical solution of the present invention is not a limitation on the types of components.

[0035] Another object of the present invention is to provide a method for preparing the polyamide composition, comprising the following steps: The components are added to a screw extruder for melt extrusion and granulation to obtain the polyamide composition.

[0036] Preferably, the screw extruder has a temperature range of 230~290℃, a screw speed of 300~500rpm, and a length-to-diameter ratio of (36~48):1.

[0037] Another object of the present invention is to provide the use of the polyamide composition in the preparation of electronic devices.

[0038] Preferably, the electronic device includes a housing, a connector, a switch, and a support frame.

[0039] Another object of the present invention is to provide an electronic device comprising the polyamide composition described herein.

[0040] The polyamide composition of this invention is based on the synergistic use of MCA, organic colorants, and fluorescent whitening agents. When the product is processed, such as by heat treatment such as baking, it can achieve high color stability and small color difference before and after processing. It can effectively control the stability of the appearance color during mass production. It has good processability. At the same time, the halogen-free flame retardant and other components in the resulting product have high stability. When the product is used in some high-temperature environments, the amount of components released is small and the loss of flame retardant components is small, which can achieve long-term flame retardant effectiveness. It is very suitable for the preparation and use of electronic and electrical components.

[0041] The beneficial effects of this invention are that it provides a polyamide composition, which uses melamine cyanurate as a halogen-free flame retardant in the product, and at the same time combines organic colorants with specific pH and introduces fluorescent whitening agents. This not only makes the flame retardant components of the product highly stable and less prone to thermal precipitation under heat, but also makes the color difference of the product after heating and baking small. During mass production and processing, the color stability between batches can be controlled. Detailed Implementation

[0042] To better illustrate the purpose, technical solution, and advantages of this invention, the invention will be further described below with reference to specific embodiments and comparative examples. The purpose of this description is to provide a detailed understanding of the invention, not to limit its scope. All other embodiments obtained by those skilled in the art without inventive effort are within the protection scope of this invention. Unless otherwise specified, the experimental reagents and instruments involved in the implementation of this invention are commonly used reagents and instruments.

[0043] Examples 1-10 Examples of the polyamide composition of the present invention are shown in Table 1.

[0044] The method for preparing the polyamide composition includes the following steps: The components are mixed evenly, and then melt-extruded and granulated in a twin-screw extruder to obtain the polyamide composition.

[0045] During melt extrusion of the component, the temperature range of the screw extruder is set to 230~290℃, the screw speed is 400rpm, and the length-to-diameter ratio is 40:1.

[0046] Comparative Examples 1-8 The only difference between each comparative example and Example 1 is the type and ratio of components, as shown in Table 2.

[0047] In the components described in each embodiment and comparative example, The PA6 resin mentioned is PA6 BE3250 produced by Jiangsu Hongsheng New Material Co., Ltd., with a viscosity of 2.46 at 25°C. The PA66 resin is PA66 EP-158 produced by Huafeng Group Co., Ltd., with a viscosity of 2.67 at 25°C. The halogen-free flame retardant 1 is MCA produced by the flame retardant plant of Shouguang Weidong Chemical Co., Ltd. The halogen-free flame retardant 2 is melamine produced by Suzhou Tejingsi Chemical Co., Ltd. The halogen-free flame retardant 3 is FR9240KF, a phosphate ester flame retardant produced by Tongcheng Xinde New Materials Co., Ltd. The organic colorant 1 is Y016, 2,2'-[1,2-ethylenedi(oxy-2,1-phenyleneazo)]bis[N-(2,3-dihydro-2-oxo-1H-benzimidazole)-5-yl]-3-oxo-butyramide, a yellow colorant with a pH of 7.42, produced by Shenzhen Tianlaibao Pigment Co., Ltd. The organic colorant 2 is Y2222 produced by Guangzhou Aoying Trading Co., Ltd., 2-[(4-chloro-2-nitrobenzene)azo]-N-(2-methoxyphenyl)-3-oxobutyramide, a yellow colorant with a pH of 7.01; The organic colorant 3 is MAZCOL BLUE 153K, copper phthalocyanine, a blue colorant produced by Shenzhen Dingtai Chemical Co., Ltd., with a pH of 7.72. The organic colorant 4 is V603 produced by Guangzhou Xinxinghui Chemical Co., Ltd., 1,8-bis[(4-methylphenyl)amino]anthraquinone, a purple colorant with a pH of 7.50; The organic colorant 5 is L308, 9-methoxy-7H-benzimidazolo[2,1-A]benzo[DE]isoquinolinyl-7-one, a blue colorant produced by Guangzhou Xinxinghui Chemical Co., Ltd., with a pH of 7.01; The organic colorant 6 is Y122,5,5'-azobis-2,4,6-(1H,3H,5H)pyrimidinetrione nickel complex produced by Guangzhou Aoying Trading Co., Ltd., a yellow colorant with a pH of 6.49; The organic colorant 7 is V601 produced by Guangzhou Xinxinghui Chemical Co., Ltd., a sodium aluminum silicate, a purple colorant, with a pH of 4.72; The organic colorant 8 is Cinilex Yellow SY1H, 3,3'-(1,4-phenylenediimino)bis(4,5,6,7-tetrachloro-1H-isoindole)-1-one, a yellow colorant produced by Shenzhen Dingtai Chemical Co., Ltd., with a pH of 8.75. The fluorescent whitening agent 1 is a commercially available OB-1,2,2'-[(1,2-ethylenedi(4,1-phenylene)]bisbenzoxazole, a benzoxazole-based fluorescent whitening agent; The fluorescent whitening agent 2 is commercially available KCB, 1,4-bis(benzoxazolyl-2-yl)naphthalene, a benzoxazole fluorescent whitening agent; The fluorescent whitening agent 3 is commercially available VBL, 4,4'-bis[(4-anilino-6-hydroxyethylamino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt, a stilbene-based fluorescent whitening agent; The fluorescent whitening agent 4 is commercially available Leucophor BSB, 4,4'-bis[[4-phenylamino-6-[(2-carbamoylethyl)(2-hydroxyethyl)amino]-1,3,5-triazine-2-yl]amino]-2,2'-stilbene disulfonate disodium salt, a pyrazoline fluorescent whitening agent; The brightener is CR-211 produced by CITIC Titanium Industry, a titanium dioxide and titanium dioxide-based brightener; The antioxidant is commercially available hindered phenolic antioxidant 1098, N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide); Unless otherwise specified, all raw materials used in the embodiments and comparative examples of this invention are commercially available. The results are shown in Table 1. Table 1 Table 2 To verify the performance of the polyamide composition described in this invention, the products prepared in each example and comparative example were subjected to the following performance tests, with the specific steps as follows: (1) Color stability test: Each product was injection molded into a standard color plate of 60×90×2mm. The initial L, a and b values ​​of the color plate were measured in advance using a color difference meter. Then the color plate was placed in an oven at 100℃ for 72h and cooled. The L, a and b values ​​of the color plate were measured again using a color difference meter, and the color difference ΔE was calculated. (2) Component stability test: The standard color plate prepared according to the specifications in step (1) is placed in a vacuum oven at 100°C for 3 hours to remove the moisture in the color plate. After cooling, the color plate is weighed using a 0.1mg balance and the weight of the color plate is recorded. The color plate is then placed in an oven at 100°C for 72 hours. After cooling, the surface precipitates are removed using gauze, and the color plate is weighed again to calculate the weight difference before and after.

[0048] The test results are shown in Tables 3 and 4.

[0049] Table 3 Table 4 As can be seen from Tables 3 and 4, the polyamide composition of the present invention has ideal processing performance. The color difference ΔE of the products in each embodiment before and after heat treatment does not exceed 1, and the color stability of the products is high during heat processing. At the same time, when the products are left in a hot environment for a long time, the mass difference of the products does not exceed 0.5 mg, indicating that the release rate of each component in the product, especially the halogen-free flame retardant component, is low in a hot environment, which is more conducive to the long-term flame retardancy of the products. In addition, the products of each embodiment were tested according to the flame retardant standard GB / T2408-2021, and the results showed that all products reached the V-0 level or above, indicating that the products have high flame retardancy.

[0050] In contrast, the organic colorants used in Comparative Examples 1 and 2, as well as Comparative Example 7, had pH values ​​that were too low or too high. Besides affecting the color stability of the product, this also clearly impacted its thermal release performance. This demonstrates that only by selecting organic colorants within the pH range defined by this invention can the intended effect be achieved. Furthermore, according to Comparative Example 8, when the product did not introduce organic colorants but instead used an equal weight amount of fluorescent whitening agent, compared to Example 1 with the same proportions, the color difference in each example was smaller. This indicates that introducing organic colorants at specific pH values ​​is beneficial for improving the compatibility and stability among other components. On the other hand, while selecting non-MCA as the halogen-free flame retardant component can also achieve good flame retardant effects, it is not suitable for the system of this invention. As shown in Comparative Examples 3 and 4, the color difference ΔE of the product is large, and the thermal release mass content is also high. Moreover, as can be seen from Comparative Examples 5 and 6, fluorescent whitening agents are crucial for the color stability of the product. While using inorganic whitening agents or other types of whitening agents can reduce color difference to some extent, they still cannot achieve the same effect as fluorescent whitening agents.

[0051] Furthermore, as can be seen from Examples 1 and 4-7, when the pH of the organic colorant is further preferably in the range of 7.3-7.6, the performance of the product can be further enhanced. When using fluorescent whitening agents, as can be seen from the comparison of Examples 1 and 8-10, the combination of benzoxazole whitening agents and MCA can further suppress the degree of color change of the product after heat processing based on the dual synergistic effect of physical covering and optical whitening, resulting in smaller color difference. Moreover, its thermal stability is high, so its impact on color difference is also smaller.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polyamide composition characterized in that, Includes the following components in parts by weight: 50-90 parts of polyamide resin, 10-40 parts of halogen-free flame retardant, 0.1-1 parts of organic colorant, and 0.1-1 parts of fluorescent whitening agent; The halogen-free flame retardant includes melamine cyanurate; The pH of the organic colorant is 7 to 7.

8.

2. The polyamide composition according to claim 1, characterized in that, The polyamide resin includes at least one of aliphatic polyamide resin and semi-aromatic polyamide resin; preferably, the aliphatic polyamide resin includes at least one of PA6 resin, PA66 resin, PA610 resin, and PA612 resin, and the semi-aromatic polyamide resin includes at least one of PA6T resin, PA9T resin, and PA10T resin.

3. The polyamide composition according to claim 2, characterized in that, The viscosity of the polyamide resin at 25°C is 2~4.

5.

4. The polyamide composition according to claim 1, characterized in that, The organic colorant includes at least one of yellow, blue, red, purple, green, and cyan colorants, and / or the organic colorant includes at least one of azo colorants, benzimidazole ketone colorants, cyanine colorants, phthalocyanine colorants, triarylmethane colorants, acridine colorants, and perylene colorants.

5. The polyamide composition according to claim 1, characterized in that, The fluorescent whitening agent includes at least one of benzoxazole fluorescent whitening agents, stilbene fluorescent whitening agents, coumarin fluorescent whitening agents, and pyrazoline fluorescent whitening agents.

6. The polyamide composition according to claim 1, characterized in that, The polyamide composition further includes 0.1 to 2 parts of antioxidant.

7. The method for preparing the polyamide composition according to any one of claims 1 to 6, characterized in that, Includes the following steps: The components are added to a screw extruder for melt extrusion and granulation to obtain the polyamide composition.

8. The use of the polyamide composition according to any one of claims 1 to 6 in the preparation of electronic devices.

9. An electronic device, characterized in that, Includes the polyamide composition according to any one of claims 1 to 6.

10. The electronic device as claimed in claim 9, characterized in that, The electronic device includes a housing, connectors, switches, and a support frame.

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