A polyamide composition, its preparation and use

Abstract

The application provides a kind of polyamide composition and its preparation method and application, the polyamide composition includes the following components by mass parts: polyamide 65-85 parts, inorganic metal salt 3-8 parts, polyether-polyamide block copolymer 14-22 parts, ionic liquid 1-4 parts.The application is designed by inorganic metal salt, polyether-polyamide block copolymer and ionic liquid and the synergistic effect of mutual coordination, so that the light transmittance of the polyamide composition is high, the transparency is good, the surface resistivity at room temperature and high temperature is low, the antistatic performance is excellent, while the elongation at break and impact strength are high, with high toughness and excellent impact resistance, greatly improving the comprehensive performance of transparent polyamide material.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of polymer materials, and particularly relates to a polyamide composition, a preparation method and application thereof. BACKGROUND

[0002] Polyamide (PA), also known as Nylon, is a general term for a class of polymers with amide repeating units in the main chain. Polyamide is one of the important thermoplastic engineering plastics, which has good mechanical properties, corrosion resistance and processing performance, and is widely used in various industries of the national economy. However, polyamide is a crystalline material, and most polyamides have limited light transmittance, which cannot meet the needs of producing transparent products.

[0003] In order to obtain transparent polyamide materials, the industry has proposed a chemical copolymerization method. For example, CN102076770A discloses a transparent copolyamide obtained by polymerizing diamines and aliphatic dicarboxylic acids, wherein the diamines include at least two different compounds, one is a cycloaliphatic diamine, and the other is a straight-chain and / or branched aliphatic diamine with 9-14 carbon atoms. The size of the crystal formed by condensation is smaller than the wavelength of visible light, so that the copolyamide has transparency. CN117801264A discloses a transparent long-chain polyamide obtained by reacting dodecanolactam, alicyclic diamine and dicarboxylic acid. By introducing diamine containing cyclohexyl, dodecanedioic acid and / or isophthalic acid and other comonomers into the molecular chain of nylon 12, the regularity of the molecular chain of nylon is reduced, thereby reducing the haze. In the preparation method of the transparent nylon material disclosed in CN113461934A, nylon 66 salt, nylon 6T salt and nylon PACM6 salt solution are mixed in a certain mass ratio and then fed into a high-temperature and high-pressure polymerization kettle for reaction. The saturated dicarboxylic acid or saturated diamine containing aromatic ring groups is used for random copolymerization with nylon 66, so as to break the crystallization behavior of the conventional nylon 66 and obtain a high-melting transparent nylon material. The chemical copolymerization method mainly improves the transparency by destroying the regularity of the polyamide molecular chain, but the process is complex, the preparation cost is high, and the final product price is high, which limits the popularization and application of the material.

[0004] CN115160778A discloses a method for improving the light transmittance of polyamide, which comprises the following steps: first, mixing polyamide 6 and metal salt to obtain a premix, the metal salt accounting for 2.01-7% of the mass of the premix; then melt blending and extruding the premix to obtain a polyamide product. Compared with the chemical copolymerization method, this method is simpler and easier to operate, but it significantly reduces the tensile elongation at break and unnotched impact strength of the material, making the polyamide brittle, poor in toughness and impact resistance, and sacrificing the performance advantages of the polyamide material.

[0005] In addition, the polyamide itself is an insulating material with a surface resistivity of about 10 14 Ω, which has electrostatic adsorption of dust during use, further affecting the transparency of the material. The commonly used antistatic agents in polyamide materials include conductive carbon black, carbon nanotubes, and polymer antistatic agents. The addition of such additives will increase the haze of the polyamide material and deteriorate the transparency.

[0006] Therefore, it is an urgent problem in the field to develop a transparent polyamide material with good toughness and impact resistance, and good antistatic effect. SUMMARY

[0007] In view of the deficiencies of the prior art, the purpose of the present application is to provide a polyamide composition, a preparation method and application thereof. By designing and compounding inorganic metal salt, polyether-polyamide block copolymer and ionic liquid, the polyamide composition has high light transmittance and excellent antistatic performance, and also has high toughness and excellent impact resistance, greatly improving the comprehensive performance of the transparent polyamide material.

[0008] To achieve this purpose, the technical scheme adopted by the present application is as follows:

[0009] In the first aspect, the present application provides a polyamide composition, which comprises the following components in parts by mass:

[0010]

[0011] In the present application, the metal ions in the inorganic metal salt can complex with the polar amide groups on the polyamide molecular chain, preventing the formation of intermolecular hydrogen bonds and inhibiting the activity freedom of the polyamide segments, so that the crystallization can only occur within a limited range, and the size of the generated crystal grains is smaller, thereby significantly reducing the scattering and refraction of light by the crystal grains and improving the light transmittance of the polyamide composition. The ionic liquid as a liquid component has a plasticizing effect on the polyamide, which can increase the intermolecular distance of the polymer and improve the flexibility and activity of the molecular chain, thereby improving the elongation at break of the polyamide composition and improving the toughness.

[0012] Polyamide itself is a hygroscopic material, and the surface resistivity decreases after natural placement and hygroscopicity, but the surface resistivity increases after long-term high-temperature baking. The present application uses ionic liquid and polyether-polyamide block copolymer to compound, which can play a better antistatic effect without affecting the light transmittance, so that the polyamide composition has low surface resistivity and excellent antistatic performance at room temperature and high temperature, and also has excellent performance in toughness and impact resistance.

[0013] In summary, this invention, through the design and mutual compounding of inorganic metal salts, polyether-polyamide block copolymers, and ionic liquids, enables the polyamide composition to have high light transmittance, good transparency, low surface resistivity at both room and high temperatures, excellent antistatic properties, high toughness, and excellent impact resistance, thereby greatly improving the overall performance of transparent polyamide materials.

[0014] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. The purpose and beneficial effects of the present invention can be better achieved and realized through the following preferred technical solutions.

[0015] In the polyamide composition of the present invention, the polyamide is in the range of 65-85 parts by weight, for example, 66 parts, 68 parts, 70 parts, 72 parts, 75 parts, 78 parts, 80 parts, 82 parts or 84 parts, and specific values ​​between the above-mentioned values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0016] The inorganic metal salt has a mass fraction of 3-8 parts, for example, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts or 7.5 parts, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0017] The polyether-polyamide block copolymer has a mass fraction of 14-22 parts, for example, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts or 21 parts, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0018] The mass fraction of the ionic liquid is 1-4 parts, for example, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts, 3 parts, 3.2 parts, 3.5 parts or 3.8 parts, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0019] In this invention, the polyamide includes any one or a combination of at least two of the following: ring-opening polymerization products of lactams, condensation products of dicarboxylic acids and diamines, and condensation products of ω-amino acids.

[0020] Preferably, the cyclic lactam includes, but is not limited to, any one or a combination of at least two of caprolactam, octyllactam, undecyllactam, and dodecalactam.

[0021] Preferably, the dicarboxylic acid exemplarily includes, but is not limited to, any one or a combination of at least two of adipic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, terephthalic acid, isophthalic acid.

[0022] Preferably, the diamine exemplarily includes, but is not limited to, any one or a combination of at least two of butanediamine, pentanediamine, hexanediamine, octanediamine, decanediamine, dodecanediamine, p-phenylenediamine, m-phenylenediamine, 4,4'-diaminodicyclohexylmethane.

[0023] The omega-amino acid exemplarily includes, but is not limited to, any one or a combination of at least two of the omega-amino acid formed by ring-opening of the aforementioned cyclic lactam, aminobenzoic acid.

[0024] Preferably, the polyamide includes any one or a combination of at least two of polyamide 6, polyamide 11, polyamide 12, polyamide 66, polyamide 610, polyamide 612, polyamide 1010, and is further preferably polyamide 6.

[0025] Preferably, the polyamide has a relative viscosity of 1.8-3.0, for example, can be 1.9, 2.0, 2.1, 2.3, 2.5, 2.7, 2.8 or 2.9, and specific point values between the above point values, limited to the length and for the sake of simplicity, the present application will not be exhaustively listed specific point values included in the range.

[0026] Exemplarily, the test method of the relative viscosity is as follows: take 0.25 g of polyamide, transfer to a 25 mL volumetric flask, add about 20 mL of concentrated sulfuric acid (96% mass fraction of H2SO4), ultrasonic oscillation until the polyamide resin is completely dissolved, cool the solution to 25°C, dilute to the mark with concentrated sulfuric acid, and mix well, test the flow time of 0.01 g / mL polyamide solution at 25°C through the Ubbelohde viscometer, record as t1, test the flow time of the solvent concentrated sulfuric acid with the same viscometer, record as t2, t1 / t2 is the relative viscosity of the polyamide.

[0027] Preferably, the inorganic metal salt includes a metal chloride, and is further preferably any one or a combination of at least two of lithium chloride, calcium chloride, zinc chloride.

[0028] Preferably, the particle size of the inorganic metal salt is 50-150 μm, for example, can be 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm or 140 μm, and specific point values between the above point values, limited to the length and for the sake of simplicity, the present application will not be exhaustively listed specific point values included in the range, and is further preferably 80-120 μm.

[0029] The present application researches and finds that the particle size of the inorganic metal salt has an influence on the complex degree of metal ions and amide groups, thereby affecting the light transmittance and mechanical properties of the polyamide composition. As a preferred technical solution of the present application, the particle size of the inorganic metal salt is 50-150 μm, more preferably 80-120 μm, which can effectively complex with the polar amide groups in the polyamide, inhibit the formation of intermolecular hydrogen bonds, reduce the grain size, and make the polyamide composition obtain higher light transmittance; on the other hand, the inorganic metal salt with a specific particle size can reduce or avoid its adverse effects on the elongation at break and unnotched impact strength of the polyamide system, so that the polyamide composition achieves an excellent balance effect in terms of high light transmittance, high toughness and high impact resistance.

[0030] In the present application, the particle size of the inorganic metal salt can be understood as the "average particle size" (D 50 The particle size of the inorganic metal salt can be determined by referring to the standard GB / T 19077-2016 Particle Size Distribution Laser Diffraction Method.

[0031] Preferably, the polyether block in the polyether-polyamide block copolymer is derived from any one or a combination of at least two of polyethylene glycol, polypropylene glycol, and polytetramethylene ether glycol.

[0032] Preferably, the polyamide block in the polyether-polyamide block copolymer is derived from polyamide 11 and / or polyamide 12, further preferably polyamide 12.

[0033] Preferably, the visible light transmittance of the polyether-polyamide block copolymer is ≥70%, for example, it can be 72%, 75%, 78%, 80%, 82%, 85%, 88%, 90%, 92% or 95%, and specific point values between the above point values, limited by the length and for the sake of simplicity, the present application will not enumerate the specific point values included in the range.

[0034] Preferably, the visible light transmittance is tested according to the method in the standard ASTM D1003-2013, and the sample thickness is 1.5 mm.

[0035] As a preferred technical solution of the present application, the polyether-polyamide block copolymer is a transparent thermoplastic elastomer composed of polyether soft segments and polyamide hard segments, preferably the hard segment is polyamide 12, which has good compatibility with the polyamide matrix and good toughening effect on the polyamide matrix, and when it is compounded with the ionic liquid, it not only has excellent antistatic effect, but also makes the polyamide composition maintain high transparency, high toughness and excellent impact resistance.

[0036] Preferably, the ionic liquid is a transparent ionic liquid.

[0037] Preferably, the ionic liquid comprises imidazolium ionic liquid, further preferably 1-butyl-3-methylimidazolium tetrafluoroborate and / or 1-butyl-3-methylimidazolium hexafluorophosphate.

[0038] Preferably, the ionic liquid has a conductivity of 1-10 mS / cm, for example, can be 2 mS / cm, 3 mS / cm, 4 mS / cm, 5 mS / cm, 6 mS / cm, 7 mS / cm, 8 mS / cm or 9 mS / cm, and specific point values between the above-mentioned point values, limited to the volume and for the sake of simplicity, the present application does not list the specific point values included in the range.

[0039] Illustratively, the conductivity of the ionic liquid is tested by a conductivity meter (such as Shanghai Leici DDS-11A conductivity meter) at a laboratory ambient temperature of 25±2℃.

[0040] Preferably, the mass ratio of the ionic liquid to the inorganic metal salt is 1:(1.5-4), for example, can be 1:1.8, 1:2, 1:2.1, 1:2.2, 1:2.4, 1:2.5, 1:2.6, 1:2.8, 1:3, 1:3.2, 1:3.5 or 1:3.8, etc., further preferably 1:(2-3).

[0041] In the present application, the ionic liquid is a transparent liquid, which has a plasticizing effect on the polyamide, can improve the flexibility and activity of the molecular chain, improve the toughness of the polyamide composition, and at the same time has a relatively high transparency; the inorganic metal salt can complex with the polar amide group in the polyamide, inhibit the formation of intermolecular hydrogen bonds, make the crystallization only in a limited range, reduce the grain size, and improve the light transmittance of the polyamide composition. The ionic liquid and the inorganic metal salt are compounded in a specific ratio, so that the polyamide composition has high light transmittance, high toughness and excellent impact resistance. If the proportion of the ionic liquid is too high, the complexation of the metal ions in the inorganic metal salt with the amide groups in the polyamide will be inhibited, resulting in a decrease in the transparency of the material; if the proportion of the ionic liquid is too low, the brittleness of the material will be significantly increased, and the elongation at break and impact resistance will be reduced.

[0042] It should be noted that the polyamide composition of the present application can also include any other additives that are motivated to be added in the art.

[0043] Preferably, the polyamide composition further comprises an antioxidant and / or a lubricant.

[0044] Preferably, the polyamide composition further comprises 0.1-1 parts by mass of an antioxidant, which can be 0.15 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, or 0.9 parts by mass, and specific point values between the aforementioned point values, the present application does not exhaustively list the specific point values included in the range for the sake of brevity and consideration of the length.

[0045] Preferably, the antioxidant comprises any one or a combination of at least two of a hindered phenolic antioxidant, a hindered amine antioxidant, an aromatic secondary amine antioxidant, a phosphite antioxidant.

[0046] Further preferably, the antioxidant comprises any one or a combination of at least two of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexylenediamine, bis(2,4-dicumylphenyl)propyl pentaerythritol diphosphite, 4,4'-bis(alpha,alpha-dimethylbenzyl)diphenylamine, 4,4'-di(phenylisopropyl)diphenylamine.

[0047] Preferably, the polyamide composition further comprises 0.1-1 parts by mass of a lubricant, which can be 0.15 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, or 0.9 parts by mass, and specific point values between the aforementioned point values, the present application does not exhaustively list the specific point values included in the range for the sake of brevity and consideration of the length.

[0048] Preferably, the lubricant comprises any one or a combination of at least two of a stearate, an ethylene propylene acid copolymer, a montan ester lubricant.

[0049] In one preferred technical solution, the polyamide composition comprises the following components by mass:

[0050]

[0051] The polyamide composition provided by the present application takes polyamide as the main resin, and preferably, the mass percentage content of the polyamide in the polyamide composition is 65-85%, for example, it can be 66%, 68%, 70%, 72%, 74%, 75%, 76%, 78%, 80%, 82%, or 84%, and specific point values between the aforementioned point values, the present application does not exhaustively list the specific point values included in the range for the sake of brevity and consideration of the length.

[0052] The inorganic metal salt helps to improve the light transmission of the polyamide composition. Preferably, the inorganic metal salt is present in the polyamide composition in an amount of 3 to 8 percent by mass, for example, 3.5 percent, 4 percent, 4.5 percent, 5 percent, 5.5 percent, 6 percent, 6.5 percent, 7 percent, or 7.5 percent, and specific point values between the aforementioned point values. Due to the length and in the interest of brevity, the present application does not exhaustively list the specific point values included in the range.

[0053] The polyether-polyamide block copolymer and the ionic liquid synergistically improve the antistatic property, toughness, and impact resistance of the polyamide composition. Preferably, the polyether-polyamide block copolymer is present in the polyamide composition in an amount of 14 to 22 percent by mass, for example, 15 percent, 16 percent, 17 percent, 18 percent, 19 percent, 20 percent, or 21 percent, and specific point values between the aforementioned point values. Due to the length and in the interest of brevity, the present application does not exhaustively list the specific point values included in the range.

[0054] Preferably, the ionic liquid is present in the polyamide composition in an amount of 1 to 4 percent by mass, for example, 1.2 percent, 1.5 percent, 1.8 percent, 2 percent, 2.2 percent, 2.5 percent, 2.8 percent, 3 percent, 3.2 percent, 3.5 percent, or 3.8 percent, and specific point values between the aforementioned point values. Due to the length and in the interest of brevity, the present application does not exhaustively list the specific point values included in the range.

[0055] In a second aspect, the present application provides a method for preparing the polyamide composition according to the first aspect, the method comprising:

[0056] The polyamide, the inorganic metal salt, the polyether-polyamide block copolymer, and the ionic liquid are melt blended and then extruded to obtain the polyamide composition.

[0057] Preferably, the method comprises the following steps:

[0058] The polyamide, the inorganic metal salt, the polyether-polyamide block copolymer, and the ionic liquid are mixed to obtain a mixture;

[0059] The mixture is melt blended and then extruded to obtain the polyamide composition.

[0060] Preferably, the mixed material further comprises an antioxidant and / or a lubricant.

[0061] Preferably, the mixing is performed in a high-speed mixer.

[0062] Preferably, the mixing time is 1-20 min, for example, it can be 2 min, 5 min, 8 min, 10 min, 12 min, 15 min or 18 min, and the specific point values between the above-mentioned point values, limited to the length and for the sake of simplicity, the present application will not be listed the specific point values included in the range, further preferably 5-10 min.

[0063] Preferably, the mixing temperature is 15-40℃, for example, it can be 18℃, 20℃, 22℃, 25℃, 28℃, 30℃, 32℃, 35℃ or 38℃, and the specific point values between the above-mentioned point values, limited to the length and for the sake of simplicity, the present application will not be listed the specific point values included in the range, further preferably room temperature.

[0064] Preferably, the mixing stirring speed is 80-500 r / min, for example, it can be 100 r / min, 150 r / min, 200 r / min, 250 r / min, 300 r / min, 350 r / min, 400 r / min or 450 r / min, and the specific point values between the above-mentioned point values, limited to the length and for the sake of simplicity, the present application will not be listed the specific point values included in the range, further preferably 100-300 r / min.

[0065] Preferably, the melt blending is carried out in a screw extruder, which is preferably a twin-screw extruder.

[0066] Preferably, the temperature of the screw extruder is 150-280℃, for example, it can be 160℃, 170℃, 180℃, 190℃, 200℃, 210℃, 220℃, 230℃, 240℃, 250℃, 260℃ or 270℃, and the specific point values between the above-mentioned point values, limited to the length and for the sake of simplicity, the present application will not be listed the specific point values included in the range, further preferably 190-230℃.

[0067] Preferably, the screw speed of the screw extruder is 200-1000 rpm, for example, it can be 300 rpm, 400 rpm, 500 rpm, 600 rpm, 700 rpm, 800 rpm or 900 rpm, and the specific point values between the above-mentioned point values, limited to the length and for the sake of simplicity, the present application will not be listed the specific point values included in the range, further preferably 300-800 rpm.

[0068] Preferably, the extrusion further comprises the steps of cooling and granulation.

[0069] In a third aspect, the present application provides a use of the polyamide composition according to the first aspect in automobile parts, electrical appliances, electronic devices, energy storage devices or connectors.

[0070] Compared with the prior art, the present application has the following beneficial effects:

[0071] The polyamide composition provided by the present application has high light transmittance, good transparency, low surface resistivity at room temperature and high temperature, excellent antistatic performance, high elongation at break and impact strength, high toughness and excellent impact resistance, and the comprehensive performance of the transparent polyamide material is greatly improved. DETAILED DESCRIPTION

[0072] The technical solutions of the present application will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only used to help understand the present application and should not be regarded as specific limitations on the present application.

[0073] As used herein, the terms "comprising", "including", "containing", "having" or any other similar forms are intended to cover non-exclusive inclusions. For example, a composition, step, method, article, or device that comprises listed elements does not necessarily limit those elements to only those listed elements, but can also include other elements not explicitly listed or inherent to such composition, step, method, article, or device.

[0074] In the following specific embodiments of the present application, the materials for preparing the method are all commercially available chemicals, and the specific information is as follows:

[0075]

[0076] The polyamide composition and the preparation method thereof of the present application will be described in detail below with multiple embodiments as examples, but the polyamide composition and the preparation method thereof are not limited to these embodiments.

[0077] Examples 1-10, Comparative Examples 1-6

[0078] A polyamide composition, the types and amounts of each component are shown in Table 1 and Table 2, and the amount of each component is "parts by mass".

[0079] The preparation method of the polyamide composition is as follows:

[0080] (1) According to the formula amount shown in Table 1, polyamide, inorganic metal salt, polyether-polyamide block copolymer, ionic liquid, antioxidant and lubricant were placed in a high-speed mixer, mixed at 300 r / min for 10 min to obtain a mixture;

[0081] (2) the mixture obtained in step (1) is added into a twin-screw extruder, the screw rotation speed of the twin-screw extruder is 600 rpm, the temperature of zone 1-8 is 190℃, 220℃, 230℃, 230℃, 230℃, 230℃, 230℃, 225℃ respectively, and the polyamide composition is obtained by melt mixing and extrusion granulation.

[0082] The polyamide composition is subjected to the following performance tests:

[0083] (1) tensile elongation at break: tensile test is carried out according to the method in standard ISO 527 2:2012, the span is 115 mm, the tensile rate is 50 mm / min, and the test temperature is 23℃;

[0084] (2) unnotched Izod impact strength: test is carried out according to the method in standard ISO180:2000, unnotched samples are injection molded, and the test temperature is 23℃;

[0085] (3) light transmittance: test is carried out according to the method in standard ASTM D1003-2013, the sample thickness is 1.5 mm;

[0086] (4) surface resistivity: test is carried out according to the method in standard GB / T 31838.3-2019, the test condition is 500V, 60s, and the test is carried out in a temperature control box; the samples after natural storage for 7 days at room temperature and the samples after drying treatment at 80℃ / 24h are tested respectively, and the corresponding test temperatures are 25℃ and 80℃ respectively;

[0087] The test data are shown in Tables 1 and 2.

[0088] Table 1

[0089]

[0090]

[0091] Table 2

[0092]

[0093]

[0094] According to the data in Table 1, by designing and mutually compounding the inorganic metal salt, the polyether-polyamide block copolymer and the ionic liquid, the light transmittance of the polyamide composition is ≥76%, which has high transparency; at the same time, the tensile elongation at break is ≥25%, the unnotched Izod impact strength is ≥50kJ / m 2 , which has high toughness and excellent impact resistance; and moreover, the surface resistivity of the polyamide composition at 25℃ is ≤6.4×10 9Ω, surface resistivity at 80℃ ≤ 2.1 x 10 11 Ω, and excellent antistatic properties at room temperature and high temperature. In addition, comparing examples 1-5 with examples 6-10, it can be seen that the polyamide composition of the present application can be further optimized in terms of transparency, antistatic properties, toughness and impact resistance, etc. by designing the particle size of the inorganic metal salt, selecting the type of ionic liquid and designing the ratio of the ionic liquid to the polyether-polyamide block copolymer.

[0095] According to the performance data in Table 2, it can be seen that the amount of inorganic metal salt in Comparative Example 1 is too low, which cannot form effective complexation with amide bonds, and it is difficult to inhibit the formation of intramolecular hydrogen bonds, resulting in a significant decrease in the light transmittance of the polyamide composition; however, excessive metal ions form complexation with amide bonds, limiting the movement of polyamide molecular chains, so the polyamide composition of Comparative Example 2 exhibits obvious brittleness, and the impact strength and elongation at break are greatly reduced.

[0096] The present application uses a polyether-polyamide block copolymer and an ionic liquid to synergistically achieve excellent antistatic effects, while maintaining high transparency, high toughness and outstanding impact resistance in the polyamide composition. In Comparative Examples 3-4, no ionic liquid is contained, resulting in a surface resistivity at 80℃ > 10 12 Ω, and the high-temperature antistatic performance is severely insufficient; in Comparative Example 5, no polyether-polyamide block copolymer is contained, and the impact performance, light transmittance and antistatic performance of the material are deteriorated to varying degrees; in Comparative Examples 6-7, the amount of ionic liquid is too high, resulting in a light transmittance < 70%, a surface resistivity at 80℃ rising, and a decrease in high-temperature antistatic performance.

[0097] The applicant declares that the polyamide composition of the present application, its preparation method and application are illustrated by the above examples, but the present application is not limited to the above examples, i.e. it does not mean that the present application must rely on the above examples to be implemented. It should be understood by those skilled in the art that any improvement on the present application, equivalent replacement of each raw material of the product of the present application, addition of auxiliary ingredients, selection of specific modes, etc. fall within the protection scope and disclosure scope of the present application.

Claims

1. A polyamide composition characterized in that, The polyamide composition comprises the following components by mass parts: polyamide 70-85 parts, inorganic metal salt 3-8 parts, polyether-polyamide block copolymer 14-22 parts, ionic liquid 1-4 parts; The inorganic metal salt is any one or a combination of at least two of lithium chloride, calcium chloride, and zinc chloride.

2. The polyamide composition according to claim 1, characterized in that, The polyamide comprises any one or a combination of at least two of polyamide 6, polyamide 11, polyamide 12, polyamide 66, polyamide 610, polyamide 612, and polyamide 1010.

3. The polyamide composition according to claim 1, characterized in that, The polyamide is polyamide 6.

4. The polyamide composition according to claim 1, characterized in that, The particle size of the inorganic metal salt is 50-150 μm.

5. The polyamide composition according to claim 1, characterized in that, The particle size of the inorganic metal salt is 80-120 μm.

6. The polyamide composition according to claim 1, characterized in that, The polyether block in the polyether-polyamide block copolymer is derived from any one or a combination of at least two of polyethylene glycol, polypropylene glycol, and polytetramethylene ether glycol.

7. The polyamide composition according to claim 1, characterized in that, The polyamide block in the polyether-polyamide block copolymer is derived from polyamide 11 and / or polyamide 12.

8. The polyamide composition according to claim 1, characterized in that, The polyamide block in the polyether-polyamide block copolymer is derived from polyamide 12.

9. The polyamide composition according to claim 1, characterized in that, The ionic liquid comprises imidazole-based ionic liquid.

10. The polyamide composition according to claim 1, characterized in that, The ionic liquid is 1-butyl-3-methylimidazolium tetrafluoroborate and / or 1-butyl-3-methylimidazolium hexafluorophosphate.

11. The polyamide composition according to claim 1, characterized in that, The mass ratio of the ionic liquid to the inorganic metal salt is 1:(1.5-4).

12. The polyamide composition according to claim 1, characterized in that, The mass ratio of the ionic liquid to the inorganic metal salt is 1:(2-3).

13. The polyamide composition according to claim 1, characterized in that, The polyamide composition further comprises antioxidant and / or lubricant.

14. The polyamide composition according to claim 1, characterized in that, The polyamide composition further comprises 0.1-1 parts of antioxidant by mass parts.

15. The polyamide composition according to claim 14, characterized in that, The antioxidant comprises any one or a combination of at least two of hindered phenol-based antioxidant, hindered amine-based antioxidant, and phosphite-based antioxidant.

16. The polyamide composition according to claim 14, characterized in that, The antioxidant comprises aromatic secondary amine-based antioxidant.

17. The polyamide composition according to claim 1, characterized in that, The polyamide composition further comprises 0.1-1 parts of lubricant by mass parts.

18. The polyamide composition according to claim 17, characterized in that, The lubricant comprises any one or a combination of at least two of stearate, ethylene propylene acid copolymer, and montanic ester lubricant.

19. A process for the preparation of a polyamide composition according to any one of claims 1 to 12, characterized in that, The preparation method comprises: The polyamide, the inorganic metal salt, the polyether-polyamide block copolymer, and the ionic liquid are melt blended and then extruded to obtain the polyamide composition.

20. The method of claim 19, wherein, The preparation method comprises the following steps: The polyamide, the inorganic metal salt, the polyether-polyamide block copolymer, and the ionic liquid are mixed to obtain a mixture; The mixture is melt blended and then extruded to obtain the polyamide composition.

21. The method of claim 20, wherein, The mixed material further comprises antioxidant and / or lubricant.

22. The preparation method according to claim 20, characterized in that, The mixing time is 1-20 min.

23. The preparation method according to claim 20, characterized in that, The mixing time is 5-10 min.

24. The method of claim 20, wherein, The melt blending is performed in a screw extruder.

25. The method of claim 24, wherein, The temperature of the screw extruder is 150-280 °C.

26. The method of claim 24, wherein, The temperature of the screw extruder is 190-230 °C.

27. The method of claim 20, wherein, The extrusion is further followed by the steps of cooling and granulation.

28. Use of the polyamide composition according to any one of claims 1-18 in automobile parts, electrical appliances, or connectors.

29. Use of the polyamide composition according to any one of claims 1-18 in electronic devices.

30. Use of the polyamide composition according to any one of claims 1-18 in energy storage devices.

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