Semi-aromatic polyamide composition as well as preparation method and application thereof

Abstract

The invention relates to a semi-aromatic polyamide composition as well as a preparation method and application thereof. The semi-aromatic polyamide composition comprises the following components in parts by weight: 32-50 parts of semi-aromatic polyamide, 15-50 parts of reinforced fibers and 6-16 parts of a liquid crystal polymer. The semi-aromatic polyamide composition provided by the invention has good weld mark strength, low dielectric constant and low dielectric loss, and the warping and floating fiber problems are well improved.

Description

Technical Field

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

[0002] Semi-aromatic polyamides (such as PA9T and PA10T) have long dominated the connector plastic materials market due to their excellent high-temperature resistance, mechanical strength, and moldability. However, with the rapid development of 5G communication, the Internet of Things, and high-speed data transmission technologies, communication connectors, as the core carriers of information transmission, are undergoing disruptive changes.

[0003] Industry technological iterations are driving connectors to evolve towards higher frequencies at an accelerated pace.

[0004] High-frequency operation places stringent requirements on the dielectric properties of materials, necessitating low dielectric constant (Dk) and low dielectric loss (Df) to ensure signal transmission efficiency. Introducing inorganic fillers such as boron nitride and mica powder can reduce the dielectric constant and dielectric loss of materials, but adding large amounts of these inorganic fillers will severely degrade the mechanical strength (weld line strength) of the materials.

[0005] To ensure the material has a certain strength, reinforcing fibers are usually added. However, the addition of reinforcing fibers can easily cause fiber floating problems, and because the reinforcing fibers tend to orient themselves along the melt flow direction of the material, they exacerbate the anisotropy of the material, ultimately affecting the appearance and warping of the connector, thus limiting the application of the material in connectors.

[0006] New technologies need to be developed to solve the above problems in order to better adapt to the industry's technological iteration. Summary of the Invention

[0007] The primary objective of this invention is to overcome the problems existing in current semi-aromatic polyamide materials and to provide a semi-aromatic polyamide composition.

[0008] A further object of the present invention is to provide a method for preparing the above-mentioned semi-aromatic polyamide composition.

[0009] A further object of the present invention is to provide the application of the above-described semi-aromatic polyamide composition in the preparation of electronic and electrical components.

[0010] The above-mentioned objective of the present invention is achieved through the following technical solution: A semi-aromatic polyamide composition comprising the following components in parts by weight: 32-50 parts of semi-aromatic polyamide, 15-50 parts of reinforcing fiber, 6-16 parts of liquid crystal polymer, The liquid crystal polymer contains amide groups and ester groups, wherein the amide groups account for 7 to 14% of the total amount of the amide groups and ester groups.

[0011] The inventors of this invention have discovered that by regulating the amide group content of the liquid crystal polymer within a specific range, it exhibits good compatibility with semi-aromatic polyamides, thereby endowing the fiber-reinforced semi-aromatic polyamide composition with low dielectric constant and low dielectric loss; and the liquid crystal polymer with a specific amide group content does not significantly degrade the mechanical strength of the semi-aromatic polyamide composition, thus giving the semi-aromatic polyamide composition good weld line strength.

[0012] The inventors also unexpectedly discovered that by controlling the amide group content of the liquid crystal polymer within a specific range, the flowability and shrinkage uniformity of the semi-aromatic polyamide composition during cooling can be controlled, as well as the flow orientation of the glass fibers during processing, thereby effectively improving the fiber floating and warping problems of the semi-aromatic polyamide composition.

[0013] That is, the semi-aromatic polyamide composition of the present invention has good weld line strength, low dielectric constant and low dielectric loss, and the warping and fiber floating problems are well improved.

[0014] In this invention, the amount of semi-aromatic polyamide can be 32, 34, 26, 38, 40, 43, 45, 48 or 50 parts by weight or any combination thereof; the amount of reinforcing fiber can be 15, 18, 20, 24, 25, 27, 30, 35, 38, 40, 45, 48 or 50 parts by weight or any combination thereof; and the amount of liquid crystal polymer can be 6, 7, 8, 10, 12, 14 or 16 parts by weight or any combination thereof.

[0015] In this invention, semi-aromatic polyamide is used as the main resin, and its content accounts for at least 30 wt% of the semi-aromatic polyamide composition.

[0016] Preferably, the semi-aromatic polyamide is a copolymer of an aromatic diacid and an aliphatic diamine, or at least one of an aromatic diacid, an aliphatic diacid, and an aliphatic diamine. Wherein, when the semi-aromatic polyamide is a copolymer of an aromatic diacid, an aliphatic diacid, and an aliphatic diamine, the amount of the aromatic diacid accounts for at least 50% (50-100%) of the total amount of the aromatic diacid and the aliphatic diacid.

[0017] More preferably, the aromatic diacid includes, but is not limited to, at least one of terephthalic acid or isophthalic acid.

[0018] More preferably, the aliphatic diacid is C 2~10Dioscortic acid, including at least one of oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, octanoic acid, azelaic acid, or sebacic acid.

[0019] More preferably, the aliphatic diamine is C 2~10 The diamine includes at least one of ethylenediamine, propylenediamine, butyldiamine, pentanediamine, hexanediamine, heptamethamine, octanediamine, nonanediamine, or decanediamine.

[0020] Preferably, the semi-aromatic polyamide is at least one of PA10T, PA9T, PA8T, PA6T, PA10T / 10I, PA6T / 66, or PA4T.

[0021] Preferably, the relative viscosity of the semi-aromatic polyamide is 1.8 to 2.3; specifically, the relative viscosity can be 1.8, 1.9, 2.0, 2.1, 2.2 or 2.3 or any range between two of them.

[0022] In this invention, the relative viscosity of the semi-aromatic polyamide can be measured according to the test standard GBT 10247-2008-2.

[0023] Preferably, the melting point of the semi-aromatic polyamide is 290~330℃.

[0024] In this invention, the melting point of the semi-aromatic polyamide can be determined by DSC.

[0025] Preferably, the liquid crystal polymer is a copolymer of aromatic hydroxycarboxylic acid, aromatic dicarboxylic acid, aromatic diphenol and nitrogen-containing aromatic phenol; the molar ratio of the aromatic hydroxycarboxylic acid, aromatic dicarboxylic acid, aromatic diphenol and nitrogen-containing aromatic phenol is (58~64):(18~21):(5~11):(7~14), more preferably (58~64):(18~21):(5~11):(8~13); the nitrogen-containing aromatic phenol is at least one of amide aromatic phenol or amino aromatic phenol.

[0026] In this invention, amide aromatic phenols refer to aromatic phenols containing one amide group and one phenolic hydroxyl group; amino aromatic phenols refer to aromatic phenols containing one amino group and one phenolic hydroxyl group.

[0027] More preferably, the molar ratio of the aromatic dicarboxylic acid to the total molar ratio of the aromatic diphenol and nitrogen-containing aromatic phenol is 1:(0.9~1.1).

[0028] More preferably, the aromatic hydroxycarboxylic acid includes, but is not limited to, at least one of hydroxybenzoic acid or 2-hydroxy-6-naphthoic acid.

[0029] More preferably, the aromatic hydroxycarboxylic acid includes hydroxybenzoic acid and 2-hydroxy-6-naphthoic acid, wherein the molar ratio of hydroxybenzoic acid to 2-hydroxy-6-naphthoic acid is (40~45):(18~19).

[0030] More preferably, the hydroxybenzoic acid is at least one selected from 2-hydroxybenzoic acid, 3-hydroxybenzoic acid, or 4-hydroxybenzoic acid. Preferably, the aromatic dicarboxylic acid includes, but is not limited to, at least one of terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, and 4,4'-biphenyldicarboxylic acid.

[0031] Preferably, the aromatic diphenol includes, but is not limited to, at least one of hydroquinone, 4,4'-dihydroxybiphenyl, or 2,6-naphthol.

[0032] Preferably, the amide aromatic phenol includes, but is not limited to, at least one of 4-acetaminophen or 6-acetamino-2-naphthol.

[0033] Preferably, the amino aromatic phenol includes, but is not limited to, at least one of p-aminophenol or 4'-amino-4-biphenol.

[0034] In this invention, the liquid crystal polymer can be either homemade or commercially available.

[0035] The homemade method can be as follows: Aromatic hydroxycarboxylic acids, aromatic dicarboxylic acids, aromatic diphenols, and nitrogen-containing aromatic phenols are mixed and subjected to an acylation reaction, followed by a polycondensation reaction to obtain the liquid crystal polymer.

[0036] Preferably, the acylation reaction is carried out at a temperature of 120-160°C for 1-3 hours.

[0037] Preferably, the polycondensation reaction is carried out at a temperature of 250-400°C, a pressure of 1-10 kPa, and a time of 0.5-2 hours.

[0038] Preferably, the acylation reaction is carried out in the presence of an acylating agent and a catalyst.

[0039] More preferably, the amount of the acylating agent is such that the molar ratio of the acylating agent to the phenolic hydroxyl groups in the monomer raw materials (aromatic hydroxycarboxylic acid, aromatic diphenol and nitrogen-containing aromatic phenol) is (1~1.2):1.

[0040] More preferably, the amount of catalyst used is: 0.02~0.5% of the total mass of the monomer raw materials (aromatic hydroxycarboxylic acid, aromatic dicarboxylic acid, aromatic diphenol and nitrogen-containing aromatic phenol) (specifically it can be 0.02%, 0.05%, 0.08%, 0.1%, 0.2%, 0.3%, 0.4% or 0.5% or any range between two).

[0041] In this invention, the amide group accounts for 7%, 8%, 9%, 10%, 11%, 12%, 13%, or 14% of the total amount of the amide and ester groups, or any range between two of these. The proportion of the amide group in the liquid crystal polymer can be determined by nuclear magnetic resonance (NMR); specifically, the peak areas of the carbonyl groups in the amide and ester groups are measured by carbon NMR spectroscopy, and then further calculated.

[0042] Preferably, the amide group accounts for 8 to 10.5% of the sum of the amide group and the ester group. Within this range, the semi-aromatic polyamide composition exhibits lower warpage, lower dielectric constant, and lower dielectric loss.

[0043] Preferably, the liquid crystal polymer accounts for 4-23% of the mass of the semi-aromatic polyamide composition; specifically, it can be 4%, 6%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 23%, or any range between the two.

[0044] More preferably, the liquid crystal polymer accounts for 10-15% of the mass of the semi-aromatic polyamide composition. Controlling this range results in a semi-aromatic polyamide composition with lower warpage, lower dielectric constant and dielectric loss, and better improvement in fiber floating issues.

[0045] Preferably, the melting point of the liquid crystal polymer is 280~350℃.

[0046] In this invention, the melting point of the liquid crystal polymer can be determined by DSC.

[0047] Preferably, the melt viscosity of the liquid crystal polymer is 20~40 Pa·s. The melt viscosity is measured using a Malvern capillary rheometer at a temperature 20°C above the melting point of the liquid crystal polymer and a shear rate of 1000 s⁻¹. -1 The measurement was performed using a die with an inner diameter of 1 mm and a length of 20 mm.

[0048] Preferably, the reinforcing fiber is at least one of glass fiber or carbon fiber.

[0049] More preferably, the reinforcing fiber is at least one of round or flat fibers.

[0050] More preferably, the average diameter of the cross-section of the circular fiber is 5~15μm.

[0051] More preferably, the flatness ratio of the flat fiber is 3~5:1, and the average short side diameter is 6~8μm.

[0052] In this invention, the average diameter of the cross-section of the circular fiber, the flatness ratio of the flat fiber, and the average short side diameter can be measured by optical microscopy.

[0053] Preferably, the average length of the reinforcing fiber is 2-5 mm.

[0054] In this invention, the average length of the reinforcing fiber can be measured by optical microscopy.

[0055] Preferably, the semi-aromatic polyamide composition further includes 10-20 parts of flame retardant.

[0056] The semi-aromatic polyamide composition of the present invention can also contain flame retardants, thereby exhibiting good flame retardancy.

[0057] More preferably, the flame retardant is at least one of phosphorus-based flame retardants or bromine-based flame retardants.

[0058] More preferably, the phosphorus-based flame retardant is at least one of aluminum dialkylphosphinate (such as aluminum diethylphosphinate), aluminum hypophosphite, or aluminum phosphite.

[0059] More preferably, the brominated flame retardant is at least one selected from brominated epoxy, brominated polystyrene, brominated polycarbonate, and decabromodiphenyl ethane.

[0060] Preferably, the semi-aromatic polyamide composition further includes 0-2 parts of other additives.

[0061] More preferably, the other additives are at least one of antioxidants or lubricants.

[0062] The preparation method of the above-mentioned semi-aromatic polyamide composition includes the following steps: mixing the components, melt extruding, and granulating to obtain the semi-aromatic polyamide composition.

[0063] Preferably, the temperature of the melt extrusion is 280~360℃; the screw length-to-diameter ratio of the extruder for the melt extrusion is 40~60:1, and the screw speed is 50~100r / min.

[0064] The application of the above-mentioned semi-aromatic polyamide composition in the preparation of electronic and electrical components is also within the scope of protection of this invention.

[0065] An electronic and electrical component is made from the above-mentioned semi-aromatic polyamide composition.

[0066] Preferably, the electronic and electrical component is a communication connector or a communication memory; especially a communication connector.

[0067] Compared with the prior art, the beneficial effects of the present invention are: The semi-aromatic polyamide composition of the present invention has good weld line strength, low dielectric constant and low dielectric loss, and the warping and fiber floating problems are well improved. Detailed Implementation

[0068] To more clearly and completely describe the technical solution of the present invention, the present invention will be further described in detail below through specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention. Various changes can be made within the scope of the claims of the present invention.

[0069] The reagents used in the various embodiments and comparative examples of this invention are described below: I. Semi-aromatic polyamide (PPA) PPA-1: PA10T, grade: Vicnyl 700, melting point: 316℃, relative viscosity 2.15, Zhuhai Wantong Special Engineering Plastics Co., Ltd.; PPA-2: PA10T / 10I, grade: Vicnyl 6100, melting point: 293℃, relative viscosity 2.12, Zhuhai Wantong Special Engineering Plastics Co., Ltd.; PPA-3: PA6T / 66, grade: Vicnyl 400, melting point: 308℃, relative viscosity 2.22, Zhuhai Wantong Special Engineering Plastics Co., Ltd.; II. Reinforcing Fibers Reinforcing fiber: Glass fiber, Chongqing International Composite Materials, ECS301HP-3-M4, with an average length of 3mm and an aspect ratio of 4:1; III. Liquid Crystal Polymer Liquid crystal polymer-1: Self-made, the process is as follows: Under nitrogen pressure, maintained at 0.1–0.2 MPa, monomeric raw materials 4-hydroxybenzoic acid, 2-hydroxy-6-naphtholic acid, terephthalic acid, 4,4'-dihydroxybiphenyl, and 4-acetaminophen (molar ratio 45:19:18:8:10) were mixed and added to the reactor. An acylation reaction was carried out under the action of an acylation agent (acetic anhydride) and a catalyst (1-methylimidazole). The acylation reaction temperature was 140℃, and the reaction time was 2 hours. After the acylation reaction, the pressure inside the reactor was reduced to atmospheric pressure, and the temperature was increased at a rate of 1℃ / min to 250–400℃ (40℃ higher than the melting point of the liquid crystal polymer). Acetic acid and unreacted acetic anhydride molecules were discharged. When the amount of acetic acid received reached more than 90% of the theoretical value, the pressure inside the reactor was reduced to 4 kPa and maintained under this reduced pressure condition for 40 minutes to obtain liquid crystal polymer-1. The amide groups of liquid crystal polymer-1 account for 10.1% of the total amount of amide groups and ester groups, and the melt viscosity is 25.2 Pa·s; Liquid Crystal Polymer-2: The only difference between it and Liquid Crystal Polymer-1 is that the molar ratio of the monomer raw materials 4-hydroxybenzoic acid, 2-hydroxy-6-naphthoic acid, phthalic acid, 4,4'-dihydroxybiphenyl and 4-acetaminophen is adjusted to 45:19:18:10:8; the amide groups of Liquid Crystal Polymer-2 account for 8.2% of the total amount of amide groups and ester groups, and the melt viscosity is 24.8 Pa·s; Liquid Crystal Polymer-3: The only difference between it and Liquid Crystal Polymer-1 is that the molar ratio of the monomer raw materials 4-hydroxybenzoic acid, 2-hydroxy-6-naphthoic acid, phthalic acid, 4,4'-dihydroxybiphenyl and 4-acetaminophen is adjusted to 45:19:18:5:13; the amide groups of Liquid Crystal Polymer-3 account for 13% of the total amount of amide groups and ester groups, and the melt viscosity is 25.1 Pa·s; Liquid crystal polymer-4: The only difference between it and liquid crystal polymer-1 is that when the amount of acetic acid received reaches more than 95% of the theoretical value, the pressure inside the reactor is reduced to 4 kPa and maintained under this reduced pressure condition for 80 min; the amide group of liquid crystal polymer-4 accounts for 10.2% of the sum of the amide group and ester group, and the melt viscosity is 35.6 Pa·s. Liquid Crystal Polymer-5: Its difference from Liquid Crystal Polymer-1 lies solely in the monomer raw materials used in the reaction: 3-hydroxybenzoic acid, 2-hydroxy-6-naphthoic acid, phthalic acid, 4,4'-dihydroxybiphenyl, and p-aminophenol (molar ratio 40:18:21:11:10) are mixed and added to the reaction vessel. Liquid Crystal Polymer-5 has amide groups comprising 10.2% of the total amount of amide and ester groups, and a melt viscosity of 25.8 Pa·s.

[0070] Liquid Crystal Polymer-6: The only difference between it and Liquid Crystal Polymer-1 is that the molar ratio of the monomer raw materials 4-hydroxybenzoic acid, 2-hydroxy-6-naphthoic acid, phthalic acid, 4,4'-dihydroxybiphenyl and 4-acetaminophen is adjusted to 45:19:18:13:5; the amide group of Liquid Crystal Polymer-6 accounts for 5.2% of the sum of the amide group and ester group, and the melt viscosity is 24.7 Pa·s; Liquid Crystal Polymer-7: The only difference between it and Liquid Crystal Polymer-1 is that the molar ratio of the monomer raw materials 4-hydroxybenzoic acid, 2-hydroxy-6-naphthoic acid, phthalic acid, 4,4'-dihydroxybiphenyl and 4-acetaminophen is adjusted to 40:18:21:5:16; the amide groups of Liquid Crystal Polymer-7 account for 16.0% of the total amount of amide groups and ester groups, and the melt viscosity is 25.0 Pa·s; IV. Flame retardants Aluminum diethylphosphonate, purchased from Clariant Exolit OP 1230 flame retardant; V. Other additives Other additives #1: Tianjin Lianlong antioxidant RIANOX 1098 and Clariant lubricant LICOCARE RBW 360 were mixed in a 1:1 mass ratio.

[0071] Unless otherwise specified, all components (e.g., glass fiber, flame retardant, other additives 1#) used in the parallel embodiments and comparative examples are the same commercially available products.

[0072] The semi-aromatic polyamide compositions of the present invention and comparative examples were prepared by the following method: (1) Weigh each component according to the proportion, and put all components except reinforcing fiber and flame retardant into a high-speed mixer and mix them evenly to obtain a mixture.

[0073] (2) The mixture is fed into the main feed port of the twin-screw extruder, the reinforcing fiber is fed from the first side feed port of the twin-screw extruder, and the flame retardant is fed from the second side feed port of the twin-screw extruder. The extruder temperature is set according to the temperature of each zone as follows: 150℃, 310℃, 330℃, 320℃, 270℃, 260℃, 280℃, 300℃, 310℃, the speed is 80r / min, and the screw length-to-diameter ratio is 46:1. After mixing, melting, homogenizing, extrusion and granulation, a semi-aromatic polyamide composition is obtained.

[0074] The performance of the semi-aromatic polyamide compositions provided in the embodiments and comparative examples of the present invention was determined according to the following test methods: (1) Weld line strength: The semi-aromatic polyamide composition was molded at 335℃ to form a dumbbell-shaped sample with 0.8mm thickness and weld line in the middle. The tensile strength of the sample was tested according to ISO527--2-2012 standard, with a tensile rate of 5mm / min.

[0075] (2) Floating fiber: The semi-aromatic polyamide composition was molded into a large square plate of 100*100*1mm at an injection temperature of 335℃, and the floating fiber area on its surface was observed; among them, the floating fiber area was less than 20cm². 2 It is rated as excellent; the floating fiber area is 20-40 cm². 2 Recorded as "Good"; floating fiber area greater than 40cm². 2 , which is recorded as difference.

[0076] (3) Warpage: The semi-aromatic polyamide composition is molded into a large square plate of 100*100*1mm at an injection temperature of 335℃. One corner is pressed down, and the height of the opposite corner is measured and recorded as the warpage data of the material.

[0077] (4) Dielectric properties: The semi-aromatic polyamide composition was molded into a 60*60*0.8mm square plate at an injection temperature of 335℃. The dielectric constant and dielectric loss of the test strip were tested according to ASTM D149 standard at a test frequency of 10GHz.

[0078] Examples 1-11 Examples 1-11 provide a series of semi-aromatic polyamide compositions, the formulations of which are shown in Table 1.

[0079] Table 1. Formulations (parts by weight) for Examples 1-11

[0080] Comparative Examples 1-4 Comparative Examples 1-4 provide a series of semi-aromatic polyamide compositions, the formulations of which are shown in Table 2.

[0081] Table 2 Formulations (parts by weight) for Comparative Examples 1-4

[0082] The properties of the semi-aromatic polyamide compositions of each embodiment and comparative example were determined according to the test methods mentioned above, and the test results are shown in Table 3.

[0083] Table 3 Performance test results of the semi-aromatic polyamide compositions of each example and comparative example

[0084] As can be seen from Table 3: The weld line strength of the semi-aromatic polyamide compositions in Examples 1-11 is all 55 MPa or above, the fiber floating evaluation is all good or excellent, the warpage test is 7.3 mm or below, the dielectric constant is all 3.3 or below, and the dielectric loss is all 0.0013 or below. This indicates that the semi-aromatic polyamide compositions of the present invention have good weld line strength, low dielectric constant and low dielectric loss, and the warpage and fiber floating problems are well improved.

[0085] In Comparative Example 1, the amide group content of the added liquid crystal polymer was too low, resulting in poor weld line strength and inadequate improvement in fiber floating and warping issues in the semi-aromatic polyamide composition. In Comparative Example 2, the amide group content of the added liquid crystal polymer was too high, failing to significantly improve fiber floating and warping issues in the semi-aromatic polyamide composition, and also exhibiting a high dielectric constant. In Comparative Example 3, no liquid crystal polymer was added, and in Comparative Example 4, no liquid crystal polymer was added but an equal amount of semi-aromatic polyamide was used instead. The fiber floating issue in the semi-aromatic polyamide composition was not significantly improved, the degree of warping improvement was less than in Example 1, and both the dielectric constant and dielectric loss were high.

[0086] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A semi-aromatic polyamide composition, characterized in that, The components include the following parts by weight: 32-50 parts of semi-aromatic polyamide, 15-50 parts of reinforcing fiber, 6-16 parts of liquid crystal polymer, The liquid crystal polymer contains amide groups and ester groups, wherein the amide groups account for 7 to 14% of the total amount of the amide groups and ester groups.

2. The semi-aromatic polyamide composition according to claim 1, characterized in that, The semi-aromatic polyamide is at least one of PA10T, PA9T, PA8T, PA6T, PA10T / 10I, PA6T / 66, or PA4T.

3. The semi-aromatic polyamide composition according to claim 1, characterized in that, The liquid crystal polymer is a copolymer of aromatic hydroxycarboxylic acid, aromatic dicarboxylic acid, aromatic diphenol and nitrogen-containing aromatic phenol; the molar ratio of the aromatic hydroxycarboxylic acid, aromatic dicarboxylic acid, aromatic diphenol and nitrogen-containing aromatic phenol is (58~64):(18~21):(5~11):(7~14); the nitrogen-containing aromatic phenol is at least one of amide aromatic phenol or amino aromatic phenol.

4. The semi-aromatic polyamide composition according to claim 3, characterized in that, The liquid crystal polymer is selected from at least one of (a) to (g): (a) The aromatic hydroxycarboxylic acid is at least one of hydroxybenzoic acid or 2-hydroxy-6-naphthoic acid; (b) The aromatic hydroxycarboxylic acid includes hydroxybenzoic acid and 2-hydroxy-6-naphthoic acid, wherein the molar ratio of hydroxybenzoic acid to 2-hydroxy-6-naphthoic acid is (40~45):(18~19). (c) The hydroxybenzoic acid is at least one of 2-hydroxybenzoic acid, 3-hydroxybenzoic acid or 4-hydroxybenzoic acid; (d) The aromatic dicarboxylic acid is at least one of terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, and 4,4'-biphenyl dicarboxylic acid; (e) The aromatic diphenol is at least one of hydroquinone, 4,4'-dihydroxybiphenyl or 2,6-naphthol; (f) The amide aromatic phenol is at least one of 4-acetaminophen or 6-acetamino-2-naphthol; (g) The amino aromatic phenol is at least one of p-aminophenol or 4'-amino-4-biphenol.

5. The semi-aromatic polyamide composition according to claim 1, characterized in that, The reinforcing fiber is at least one of glass fiber or carbon fiber.

6. The semi-aromatic polyamide composition according to claim 1, characterized in that, The liquid crystal polymer accounts for 4-23% of the mass of the semi-aromatic polyamide composition.

7. The semi-aromatic polyamide composition according to claim 1, characterized in that, The semi-aromatic polyamide composition further includes 10-20 parts of flame retardant and 0-2 parts of other additives.

8. A method for preparing the semi-aromatic polyamide composition according to any one of claims 1 to 7, characterized in that, The process includes the following steps: mixing the components, melt extruding, and granulating to obtain the semi-aromatic polyamide composition.

9. The use of the semi-aromatic polyamide composition according to any one of claims 1 to 7 in the preparation of electronic and electrical components.

10. An electronic and electrical component, characterized in that, It is prepared from any of the semi-aromatic polyamide compositions according to claims 1 to 7.

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