Preparation method of aromatic polyester resin composition

Abstract

The invention relates to a preparation method of an aromatic polyester resin composition, which comprises the following steps: mixing raw materials, and pouring the mixed raw materials into a stainless steel reaction kettle; heating and refluxing: heating to 120 DEG C to refluxing the reaction system; heating and distilling, opening a distillation system, and distilling out excessive acetic anhydride and byproduct acetic acid; discharging treatment is conducted, discharging is conducted after the reaction is completed, material sheets are discharged from the tablet press, the cooled materials are fed into a pulverizer to be pulverized, and low-molecular-weight aromatic polyester resin powder is obtained; and performing solid-phase polymerization, namely putting the low-molecular-weight aromatic polyester resin powder into an intermittent rotary furnace, and performing solid-phase polymerization. The preparation method has good stability and reliability, the reaction steps are simplified, the operation difficulty is reduced, and the convenience of the production process is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high polymer materials, in particular to a preparation method of an aromatic polyester resin composition. BACKGROUND

[0002] In the field of high polymer materials, the research and development of high-performance high polymer materials has always been one of the core driving forces for promoting the upgrading of related industries. As a new type of high-performance high polymer material, aromatic polyester resin composition has unique molecular structure, which endows it with excellent comprehensive performance, and has received widespread attention in the industry in recent years.

[0003] The monomers for synthesizing aromatic polyester resin composition are mainly aromatic carboxylic acids and aromatic ethers or aromatic alcohols, which form polymer molecular chains through esterification reaction. Due to the presence of aromatic ring structure in the molecular chain, this kind of compound has very strong rigidity. At the same time, in the molten state, the aromatic polyester resin composition presents a crystal state, and the molecular chains are arranged in parallel. This special aggregate structure makes the molecular chains easily orient along the processing flow direction during subsequent modification and processing, and still maintains this orientation after cooling, so that the polyester compound has high rigidity and excellent toughness, achieving a good balance between rigidity and toughness, and has very superior comprehensive performance.

[0004] In addition to the excellent combination of rigidity and toughness, aromatic polyester resin composition also has a series of outstanding performance characteristics. In terms of mechanical properties, it has high strength and high modulus characteristics, and can withstand large external forces without easy deformation or fracture; in terms of safety and stability, it has high flame retardance and high temperature resistance, can maintain structural stability even in high temperature environment, and also has good radiation resistance, can be used normally in radiation environment; in terms of processing performance, aromatic polyester resin composition also performs well, and is easy to perform various molding processing operations.

[0005] Based on the above excellent performance, aromatic polyester resin composition has shown broad application prospects in many high-end fields. In the field of aerospace, it can be used to manufacture structural parts and high-temperature-resistant parts of aircraft, meeting the stringent requirements of aerospace for high-performance materials; in the field of electronic appliances, it can be used to produce shells and insulating materials of various high-precision electronic components, ensuring the stable operation of electronic appliances; in the field of automobile industry, it can be applied to high-temperature-resistant parts and structural reinforcement parts of automobiles, improving the performance and safety of automobiles.

[0006] Especially in the field of 5G communication, aromatic polyester resin compositions exhibit excellent absorption capabilities for high-frequency signals. This characteristic makes them valuable in the manufacture of 5G transmission terminals and 5G antennas, effectively improving the signal processing capabilities and stability of 5G communication equipment. Furthermore, thanks to their good rigidity and toughness, aromatic polyester resin compositions can also be used in spinning and film-forming processes. The fibers and films prepared from these compositions demonstrate outstanding performance in products such as bulletproof vests and cables, which require extremely high material strength and toughness, providing strong support for performance enhancement in these products.

[0007] However, there are still some problems to be solved in the current preparation process of aromatic polyester resin compositions. Some preparation methods have complex reaction steps and are difficult to operate, which is not conducive to large-scale industrial production. At the same time, the resins prepared by some methods have poor flowability and stability, which brings difficulties to the subsequent preparation of aromatic polyester resin compositions and affects product quality and production efficiency. Summary of the Invention

[0008] In view of the above-mentioned problems in the prior art, the present invention provides a method for preparing an aromatic polyester resin composition.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a method for preparing an aromatic polyester resin composition, characterized by comprising the following steps: The raw materials are mixed by mixing p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, terephthalic acid, and 4,4-biphenyl hydroquinone and then pouring the mixture into a stainless steel reactor. Acetic anhydride is then added to the stainless steel reactor. The mixture was heated to 120°C to reflux, and the reflux system was turned off after 4 hours. Heat the distillation process, turn on the distillation system, and distill off excess acetic anhydride and the byproduct acetic acid; gradually increase the temperature of the stainless steel reactor to 300℃~330℃ over 12 hours. After the reaction is complete, the material is discharged. The bottom of the stainless steel reactor is equipped with a bottom-discharge valve for heating. The temperature is maintained at 300℃~330℃, allowing the molten material to flow slowly in the discharge trough and into the tablet press. The material is discharged from the tablet press as a sheet. After cooling, the material is sent to the pulverizer for crushing to obtain low molecular weight aromatic polyester resin powder. Solid-phase polymerization involves placing low molecular weight aromatic polyester resin powder into an intermittent rotary furnace for solid-phase polymerization. The polymerization temperature is 220℃ for 2-3.5 hours, 240℃ for 3-3.5 hours, and 250℃ for 3-3.5 hours. After the reaction is complete, the material is released, which is aromatic polyester resin powder with increased molecular weight.

[0010] Preferably, before the raw material mixing step, p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, terephthalic acid, and 4,4-biphenyldiphenol are dried using a vacuum drying oven.

[0011] Preferably, before the raw material mixing step, p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, terephthalic acid, and 4,4-biphenyldiphenol are dried using a vacuum drying oven.

[0012] Preferably, the stainless steel reactor is made of 316L stainless steel.

[0013] Preferably, the crusher is a hammer crusher or a roller crusher, and the particle size of the crushed material is controlled within 0.1-1mm.

[0014] Preferably, after the raw material mixing step, the feed port of the stainless steel reactor is closed to ensure that the stainless steel reactor is in a sealed state.

[0015] Preferably, the tablet press is equipped with a condensation device, which can rapidly cool the incoming molten material.

[0016] Preferably, in the solid-phase polymerization step, the molecular weight of the aromatic polyester resin powder needs to be tested periodically, and the number-average molecular weight and weight-average molecular weight of the resin are determined by gel permeation chromatography.

[0017] Preferably, the stainless steel reactor is connected to a nitrogen system and a high vacuum system.

[0018] Compared with the prior art, the present invention has at least the following advantages: First, the aromatic polyester resin composition prepared by this invention has a high melting point of 293℃-296℃ and a thermal decomposition temperature of 505℃-506℃, exhibiting excellent high-temperature resistance. It can maintain structural stability under high-temperature environments, meeting the requirements of high-temperature applications such as aerospace and electronic devices. In terms of mechanical properties, due to the presence of repeating units derived from various aromatic monomers in the resin molecular chain, the molecular structure is regular and rigid. Furthermore, through reasonable raw material ratios and polymerization processes, the resin possesses high strength, high modulus, and good toughness, enabling it to withstand significant external forces without easily being damaged. This lays a solid foundation for the subsequent preparation of high-performance fully aromatic polyester films.

[0019] Second, the aromatic polyester resin composition prepared by this invention also possesses good flowability and stability. During the preparation process of the aromatic polyester resin composition, it can smoothly undergo molding processes such as casting and stretching, and is less prone to defects such as cracking and wrinkling, which helps improve the product quality and production efficiency of the fully aromatic polyester film. Simultaneously, the resin has excellent absorption capabilities for high-frequency signals. Its application in the manufacture of 5G communication equipment such as 5G transmission terminals and 5G antennas can effectively enhance the signal processing capabilities and stability of the equipment.

[0020] Third, this invention greatly reduces cumbersome intermediate operation steps and lowers the difficulty of operation. It not only makes it easier for operators to carry out production operations, but also reduces human error caused by complex operation steps, and improves the stability and reliability of the production process.

[0021] Fourth, the equipment used in this invention, such as the 316L stainless steel reactor, batch rotary furnace, tablet press, and pulverizer, are all commonly used in industrial production. This equipment is readily available and easy to maintain, requiring no large-scale equipment modification or customization, thus reducing initial investment costs for industrial production. Simultaneously, the two-step polymerization process design avoids the problem of difficult-to-handle viscous materials encountered in one-step polymerization, enabling continuous and stable production, improving production efficiency, and meeting the needs of large-scale industrial production. Furthermore, the high utilization rate of raw materials during production, with a resin yield exceeding 97.8%, reduces raw material waste and lowers production costs. Detailed Implementation

[0022] In view of the shortcomings of the prior art, the inventors of this case, through long-term research and extensive practice, have proposed the technical solution of this invention. It should be noted that the embodiments described below are exemplary and are only used to explain this invention, and should not be construed as limiting the invention. The described embodiments are merely a part of the embodiments of this invention, not all of them. Based on the embodiments of this invention, this invention covers any substitutions, modifications, equivalent methods and solutions made within the spirit, principles, and scope of this invention as defined by the claims. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] In the description of this application, the terms "first," "second," "third," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar words, do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar words, mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. The terms "connected" or "linked," and similar words, are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0024] In the description of this application, unless otherwise expressly specified and limited, the technical or scientific terms used shall have the ordinary meaning understood by a person with ordinary skills in the art to which this application pertains. Terms such as “installation,” “connection,” and “joining” shall be interpreted broadly, for example, as fixed connection, detachable connection, mating connection, or integral connection. For a person skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0025] Example 1 The method for preparing the aromatic polyester resin composition of the present invention includes the following steps: The raw materials are mixed by mixing 50 mol of p-hydroxybenzoic acid (HBA), 30 mol of 6-hydroxy-2-naphthoic acid, 5 mol of terephthalic acid, and 5 mol of 4,4-biphenylhydrazine and then pouring the mixture into a stainless steel reactor. 100 mol of acetic anhydride is then added to the stainless steel reactor. The mixture was heated to 120°C to reflux, and the reflux system was turned off after 4 hours. The temperature is raised and the distillation system is turned on to distill off excess acetic anhydride and the byproduct acetic acid. The temperature of the stainless steel reactor is gradually increased to 320°C over 12 hours, and acetic acid flows out continuously from the condenser. During this process, the liquid flow rate in the condenser is reduced to zero.

[0026] After the reaction is complete, the material is discharged. The stainless steel reactor is equipped with a bottom-discharge valve, which is heated and maintained at 320℃. This allows the molten material to flow slowly into the discharge trough, ensuring even distribution into the tablet press. The material is then discharged in tablet form. After cooling, the material is fed into a pulverizer for further grinding to obtain low-molecular-weight aromatic polyester resin powder. The melting point of the aromatic polyester resin powder is 265℃. Solid-state polymerization involves placing low-molecular-weight aromatic polyester resin powder into a batch rotary furnace for solid-state polymerization. The polymerization temperature is gradually increased: 220℃ for 2 hours, 240℃ for 3 hours, and 250℃ for 3.2 hours. This gradual increase in temperature further increases the molecular weight and viscosity of the resin. After the reaction is complete, the material is discharged; this material is the aromatic polyester resin powder with increased molecular weight. The melting point of the powder is 296℃. The solid-state polymerization step further increases the molecular weight of the resin, enhances its viscosity and properties, making it more suitable for the preparation process of aromatic polyester films. It effectively avoids the problem of excessively viscous material that cannot be discharged from the reactor during one-time polymerization. It also allows for precise control of the resin's molecular weight and properties, improving production stability and reliability. The batch rotary furnace ensures that the resin powder is continuously agitated during polymerization, guaranteeing uniform heating and preventing localized overheating that could lead to resin decomposition.

[0027] Before the raw material mixing step, p-hydroxybenzoic acid (HBA), 6-hydroxy-2-naphtholic acid, terephthalic acid, and 4,4-biphenylhydrazine are dried to remove moisture. The presence of moisture adversely affects the polymerization reaction, potentially leading to incomplete reaction, reduced resin molecular weight, and decreased performance. Therefore, drying is a crucial pretreatment step to ensure smooth reaction and resin quality. Drying can be performed in a vacuum drying oven at 80-120℃ for 4-8 hours. Specific drying conditions can be adjusted according to the moisture content of the raw materials to ensure the moisture content is reduced to below 0.1%.

[0028] The raw material mixing step can be carried out in a high-speed mixer with a mixing speed of 500-1000 r / min and a mixing time of 10-20 minutes, so that the raw materials can be mixed evenly and avoid uneven mixing of raw materials, which may lead to local inconsistency in the reaction and affect the uniformity of resin performance.

[0029] The stainless steel reactor is made of 316L stainless steel. 316L stainless steel has excellent corrosion resistance and high temperature resistance, which can adapt to the high temperature and corrosive environment in the polymerization process and ensure the long-term stable use of the reactor.

[0030] The pulverizer can be a hammer mill or a roller mill. The particle size of the pulverized material is controlled at 0.1-1mm to obtain low molecular weight aromatic polyester resin powder. The pulverized powder particles are fine and uniform, which is beneficial to the heat transfer and full reaction in the subsequent solid-state polymerization process.

[0031] After the raw material mixing step, close the feed port of the stainless steel reactor to ensure that the stainless steel reactor is in a sealed state, preventing material leakage or outside air from entering the reactor and affecting the reaction.

[0032] The reflux heating step involves slowly raising the temperature inside the stainless steel reactor to 120°C by activating the heating device, bringing the reaction system to a reflux state. Under reflux conditions, the materials in the reaction system can mix and contact thoroughly, promoting the acylation reaction and ensuring that the hydroxyl groups in the raw materials react with acetic anhydride to form esters. The reflux time is controlled at 4 hours. During this period, it is necessary to closely monitor the temperature and pressure changes inside the reactor to ensure that the reaction system remains stable under reflux conditions.

[0033] The tablet press is equipped with a condensate system to rapidly cool the incoming molten material. When the molten material enters the press, it rapidly cools and solidifies into sheets under the combined action of pressure and condensate. The press pressure is controlled at 10-20 MPa, and the condensate temperature is controlled at 20-30°C to ensure sufficient cooling and solidification, resulting in sheets of uniform thickness and a smooth surface. After exiting the press, the sheets undergo further cooling, either by air or water, to bring them to room temperature.

[0034] During the solid-state polymerization step, the molecular weight of the aromatic polyester resin powder needs to be tested periodically. Gel permeation chromatography (GPC) can be used to determine the number-average molecular weight and weight-average molecular weight of the resin. Based on the test results, the polymerization temperature and time should be adjusted in a timely manner to ensure that the final aromatic polyester resin powder has suitable molecular weight and viscosity to meet the process requirements for subsequent aromatic polyester film preparation.

[0035] Specifically, the stainless steel reactor is connected to a nitrogen system and a high vacuum system. On the one hand, the reactor can be evacuated before the reaction to remove air and moisture, providing a clean and dry environment for the reaction. On the other hand, during the reaction (the heat preservation period in the heating distillation), high-purity nitrogen is introduced to protect the reaction system, prevent the oxidation of materials, and promptly remove by-products generated by the reaction, promoting the reaction in the forward direction.

[0036] This invention involves adding a certain amount of acetic anhydride to the reaction vessel. Acetic anhydride acts as an acylating agent, reacting with the hydroxyl groups in the raw materials during the reaction to form ester bonds, thus promoting the polymerization reaction. The amount of acetic anhydride added needs to be precisely calculated based on the total amount of the raw materials to ensure that the acetic anhydride reacts fully with the raw materials while avoiding excessive acetic anhydride from placing an undue burden on subsequent separation and purification.

[0037] p-Hydroxybenzoic acid (HBA), as an important monomer, plays a crucial role in the formation of resin molecular chains. Its hydroxyl and carboxyl groups can participate in esterification reactions, jointly constructing the resin's molecular skeleton with other monomers, significantly influencing the resin's rigidity, high-temperature resistance, and other properties. 6-Hydroxy-2-naphthoic acid: This monomer contains a naphthalene ring structure. The introduction of the naphthalene ring further enhances the rigidity and stability of the resin molecular chain, while also improving the resin's high-temperature resistance and mechanical properties, allowing the resin to maintain good structural stability and mechanical strength even at high temperatures. 4,4-Biphenyl contains two phenolic hydroxyl groups, which can undergo esterification reactions with carboxyl-containing monomers such as terephthalic acid. Its biphenyl structure can enhance the rigidity and toughness of the resin molecular chain, improve the overall performance of the resin, and enable the resin to have both high strength and good toughness, so as to meet the diverse performance requirements of different application scenarios.

[0038] Example 2 The method for preparing the aromatic polyester resin composition of the present invention includes the following steps: The raw materials were mixed by mixing 50 mol of p-hydroxybenzoic acid (HBA), 30 mol of 6-hydroxy-2-naphtholic acid, 3 mol of terephthalic acid, and 3 mol of 4,4-biphenylhydrazine and then pouring the mixture into a 316L stainless steel reactor that was connected to a high-purity nitrogen and high-vacuum system. 100 mol of acetic anhydride was then added to the reactor. Heat the system to reflux, close the feed inlet, raise the temperature to 120°C to reflux the reaction system, and close the reflux system after 4 hours. The temperature was increased and the distillation system was turned on to distill off excess acetic anhydride and the byproduct acetic acid. Over 11.5 hours, the temperature was gradually increased in the stainless steel reactor until it stabilized at 310°C. Acetic acid continuously flowed out of the condenser, during which the liquid flow rate in the condenser decreased to zero. After the reaction is complete, the material is discharged. The stainless steel reactor has a bottom-discharge valve for heating, maintaining a temperature of 330℃. This allows the molten material to flow slowly and evenly into the tablet press (equipped with a cooling system). The material is then discharged in tablet form. After cooling, the material is fed into a pulverizer to obtain low-molecular-weight aromatic polyester resin powder. The melting point of the aromatic polyester resin powder is 250℃.

[0039] Solid-state polymerization involves placing low-molecular-weight aromatic polyester resin powder into an intermittent rotary furnace for solid-state polymerization. The polymerization temperature is set at 220℃ for 3 hours, 240℃ for 3.5 hours, and 250℃ for 3.5 hours. After the reaction is complete, the material is released, which is aromatic polyester resin powder with increased molecular weight. The melting point of the powder is 293℃.

[0040] Example 3 The method for preparing the aromatic polyester resin composition of the present invention includes the following steps: The raw materials are mixed by mixing 60 mol of p-hydroxybenzoic acid (HBA), 20 mol of 6-hydroxy-2-naphthoic acid, 5 mol of terephthalic acid, and 5 mol of 4,4-biphenylhydrazine and then pouring the mixture into a 316L stainless steel reactor that is connected to a high-purity nitrogen and high-vacuum system. 100 mol of acetic anhydride is then added to the reactor.

[0041] Heat the system to reflux, close the feed inlet, and raise the temperature to 120°C to reflux the reaction system. After 4 hours, turn off the reflux system.

[0042] The temperature is raised and the distillation system is turned on to distill off excess acetic anhydride and the byproduct acetic acid. Over 10.5 hours, the temperature of the stainless steel reactor is gradually increased to stabilize at 300°C. Acetic acid continuously flows out of the condenser, and during this process, the liquid flow rate in the condenser decreases to zero.

[0043] After the reaction is complete, the material is discharged. The stainless steel reactor has a bottom-discharge valve for heating, maintaining a temperature of 300℃. This allows the molten material to flow slowly and evenly into the tablet press (equipped with a cooling system). The material is then discharged in tablet form. After cooling, the material is fed into a pulverizer to obtain low-molecular-weight aromatic polyester resin powder. The powder has a melting point of 248℃.

[0044] Solid-state polymerization involves placing low-molecular-weight aromatic polyester resin powder into an intermittent rotary furnace for solid-state polymerization. The polymerization temperature is set at 220℃ for 3.5 hours, 240℃ for 3.5 hours, and 250℃ for 3 hours. After the reaction is complete, the material is released, which is aromatic polyester resin powder with increased molecular weight. The melting point of the powder is 294℃.

[0045] The melting point, thermal stability, and overall yield of each embodiment are shown in Table 1 below.

[0046] Table 1 Example 1 Example 2 Example 3 Melting point 296℃ 293℃ 294℃ Thermal stability 505℃ 506℃ 505℃ Overall yield 98.2% 98.1% 97.8% As shown in Table 1 above, the aromatic polyester resin composition prepared by this invention exhibits excellent and stable properties in terms of melting point, thermal stability, and yield. In the three examples, the melting point of the resin was between 293℃ and 296℃, the thermal decomposition temperature was between 505℃ and 506℃, and the yield was above 97.8%. This indicates that the preparation method of this invention has good stability and reliability, and can stably prepare high-performance aromatic polyester resins.

[0047] This invention simplifies the reaction steps for preparing aromatic polyester resin compositions, reduces operational difficulty, and improves the convenience of the production process, thereby better enabling large-scale industrial production.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for preparing an aromatic polyester resin composition, characterized in that, Includes the following steps: The raw materials are mixed by mixing p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, terephthalic acid, and 4,4-biphenyl hydroquinone and then pouring the mixture into a stainless steel reactor. Acetic anhydride is then added to the stainless steel reactor. Heat to reflux, raise the temperature to 120°C to reflux the reaction system, and turn off the reflux system after 4 hours; Heat the distillation process, turn on the distillation system, and distill off excess acetic anhydride and the byproduct acetic acid; gradually increase the temperature of the stainless steel reactor to 300℃~330℃ over 12 hours. After the reaction is complete, the material is discharged. The bottom of the stainless steel reactor is equipped with a bottom-discharge valve for heating. The temperature is maintained at 300℃~330℃, allowing the molten material to flow slowly in the discharge trough and into the tablet press. The material is discharged from the tablet press as a sheet. After cooling, the material is sent to the pulverizer for crushing to obtain low molecular weight aromatic polyester resin powder. Solid-phase polymerization involves placing low molecular weight aromatic polyester resin powder into an intermittent rotary furnace for solid-phase polymerization. The polymerization temperature is 220℃ for 2-3.5 hours, 240℃ for 3-3.5 hours, and 250℃ for 3-3.5 hours. After the reaction is complete, the material is released, which is aromatic polyester resin powder with increased molecular weight.

2. The method for preparing the aromatic polyester resin composition according to claim 1, characterized in that, Before the raw material mixing step, p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, terephthalic acid, and 4,4-biphenyldiphenol are dried using a vacuum drying oven.

3. The method for preparing the aromatic polyester resin composition according to claim 1, characterized in that, The raw material mixing step is carried out in a high-speed mixer with a mixing speed of 500-1000 r / min and a mixing time of 10-20 minutes.

4. The method for preparing the aromatic polyester resin composition according to claim 1, characterized in that, The stainless steel reactor is made of 316L stainless steel.

5. The method for preparing the aromatic polyester resin composition according to claim 1, characterized in that, The crusher is a hammer crusher or a roller crusher, and the particle size of the crushed material is controlled within 0.1-1mm.

6. The method for preparing the aromatic polyester resin composition according to claim 1, characterized in that, After the raw material mixing step, the feed port of the stainless steel reactor is closed to ensure that the stainless steel reactor is in a sealed state.

7. The method for preparing the aromatic polyester resin composition according to claim 1, characterized in that, The tablet press is equipped with a condensation device, which can rapidly cool the flowing molten material.

8. The method for preparing the aromatic polyester resin composition according to claim 1, characterized in that, In the solid-phase polymerization step, the molecular weight of the aromatic polyester resin powder needs to be tested periodically, and the number-average molecular weight and weight-average molecular weight of the resin are determined by gel permeation chromatography.

9. The method for preparing the aromatic polyester resin composition according to claim 1, characterized in that, The stainless steel reactor is connected to a nitrogen system and a high vacuum system.