Preparation system for high-temperature-resistant PET (Polyethylene Terephthalate) functional master batch

Abstract

The utility model discloses a preparation system for a high-temperature-resistant PET (Polyethylene Terephthalate) functional master batch. The preparation system comprises an esterification tank and a polycondensation tank, the esterification tank is provided with a first inlet, a second inlet, a third inlet and a fourth inlet connected with the first auxiliary material tank; the polycondensation tank is provided with a fifth inlet connected with the outlet of the esterification tank, and a sixth inlet and a seventh inlet which are connected with a second auxiliary material tank; an outlet of the polycondensation tank is connected with at least one extruder, an outlet of the extruder is connected with a granulator, and an outlet of the granulator is connected with a vacuum drying tank. Based on the defect of lack of a preparation system in the prior art, the utility model provides a novel system for preparing the high-temperature-resistant PET functional master batch, and the functional master batch prepared by the preparation system disclosed by the utility model not only has excellent high-temperature resistance, but also can obtain more uniform quality.

Description

Technical Field

[0001] This application relates to a preparation system for high-temperature resistant PET functional masterbatch. Background Technology

[0002] High-temperature resistant PET (polyethylene terephthalate) can maintain its properties at high temperatures and is widely used in many fields. For example, in the electronics and electrical industry, high-temperature resistant PET is often used to manufacture electrical insulation materials, electronic components, and connector housings. It maintains good insulation properties in high-temperature environments and has strong impact resistance and dimensional stability. In the automotive industry, high-temperature resistant PET is commonly used in automotive parts, such as engine parts, cable sheaths, headlight reflectors, and sensor housings. These parts typically operate in high-temperature environments, and high-temperature resistant PET effectively improves their service life and durability. In the packaging industry, high-temperature resistant PET can be used to manufacture packaging materials for retortable foods. It has good heat resistance and barrier properties, maintaining the safety and quality of food at high temperatures. In the machinery industry, due to its excellent mechanical strength and abrasion resistance, high-temperature resistant PET can be used to manufacture mechanical parts, such as bearings, gears, and sliding rails. These parts need to withstand large mechanical loads and high-temperature environments during operation. In the medical device industry, high-temperature resistant PET is also used to manufacture housings for some medical devices and equipment that require high-temperature sterilization. Its chemical stability and biocompatibility make it a preferred material in the medical industry. In the field of optics, high-temperature resistant PET, due to its transparency and excellent optical properties, is often used as optical films, display screen protective films, etc., especially in some optical components that need to withstand high-temperature processing. In short, due to its excellent physical and chemical properties, high-temperature resistant PET is widely used in fields requiring high temperature resistance, high mechanical strength, and chemical corrosion resistance, covering multiple industries from electronics and electrical appliances, automotive industry, packaging, medical devices to optical components.

[0003] The prior art contains various high-temperature resistant polyester films and their application examples. For example, CN109054311 B discloses a high-temperature resistant polyester film and its preparation method. CN 117024806 B discloses a method for preparing a high-temperature resistant reinforced PET release film.

[0004] The aforementioned existing technologies all lack systems or equipment for preparing high-temperature resistant PET functional masterbatches, and it is difficult to obtain uniform quality for the high-temperature resistant polyester products of the aforementioned existing technologies. Summary of the Invention

[0005] The technical problem to be solved by this application is to provide a preparation system for high-temperature resistant PET functional masterbatch, so as to reduce or avoid the problems mentioned above.

[0006] To address the aforementioned technical problems, this application proposes a preparation system for high-temperature resistant PET functional masterbatch, comprising an esterification tank and a polycondensation tank; the esterification tank has a first inlet, a second inlet, a third inlet, and a fourth inlet connected to a first auxiliary material tank; the polycondensation tank has a fifth inlet connected to the outlet of the esterification tank, a sixth inlet connected to a second auxiliary material tank, and a seventh inlet; the outlet of the polycondensation tank is connected to at least one extruder, the outlet of the extruder is connected to a pelletizer, and the outlet of the pelletizer is connected to a vacuum drying tank.

[0007] Preferably, the first auxiliary material tank is provided with three inlets and a stirrer; the second auxiliary material tank is provided with four inlets; the second auxiliary material tank is provided with a water bath heating jacket and a stirrer.

[0008] Based on the lack of preparation systems in existing technologies, this application proposes a new system for preparing high-temperature resistant PET functional masterbatches. The functional masterbatches prepared by the preparation system of this application not only have excellent high-temperature resistance but also achieve more uniform quality. Attached Figure Description

[0009] The accompanying drawings are intended only to illustrate and explain this application and do not limit the scope of this application.

[0010] Figure 1 The diagram shown is a structural schematic of a system for preparing high-temperature resistant PET functional masterbatch according to this application. Detailed Implementation

[0011] To provide a clearer understanding of the technical features, objectives, and effects of this application, specific embodiments are now described with reference to the accompanying drawings. Identical components are denoted by the same reference numerals.

[0012] In view of the problems of the prior art, this application proposes a preparation system for high-temperature resistant PET functional masterbatch. The high-temperature resistant PET functional masterbatch prepared by the preparation system can maintain its performance at high temperatures and can be applied in fields such as electronics, automobiles, packaging, machinery, medical devices, and optics.

[0013] In one specific embodiment, the high-temperature resistant PET functional masterbatch prepared by the preparation system of this application can be used alone as a raw material to prepare high-temperature resistant PET films or parts, or it can be added to ordinary polyester raw materials as a functional additive to prepare polyester products with certain high-temperature resistance requirements. It can also be used as a high-temperature resistant functional layer in a multilayer polyester film to improve the high-temperature resistance of the multilayer polyester film.

[0014] In one specific embodiment, for example, the high-temperature resistant PET functional masterbatch of this application can be prepared from the following raw materials in parts by weight: 50-100 parts by weight of terephthalic acid, 20-45 parts by weight of ethylene glycol, 5-10 parts by weight of dimethyl 2,6-naphthalenedicarboxylate, 0.02-0.04 parts by weight of acetic anhydride, 0.03-0.05 parts by weight of acetone, 0.005-0.01 parts by weight of antimony dioxide, 0.01-0.03 parts by weight of triethyl phosphate, 0.01-0.03 parts by weight of sodium dodecylbenzenesulfonate, 0.05-0.10 parts by weight of 2-hydroxy-4-(3-triethoxysilanepropoxy)benzophenone, 0.10-0.15 parts by weight of ethanol, and 0.01-0.03 parts by weight of cellulose acetate. The cellulose acetate is selected from commercially available powder with an acetyl content of 37%-40%.

[0015] The high-temperature resistant PET functional masterbatch of this application can be prepared by the following method. For example, 0.02-0.04 parts by weight of acetic anhydride and 0.03-0.05 parts by weight of acetone can be uniformly mixed, and then 0.005-0.01 parts by weight of antimony dioxide can be added. The mixture is uniformly mixed and reacted for more than 30 minutes to prepare solution A for later use.

[0016] Meanwhile, 0.01-0.03 parts by weight of sodium dodecylbenzenesulfonate, 0.05-0.10 parts by weight of 2-hydroxy-4-(3-triethoxysilanepropoxy)benzophenone, 0.10-0.15 parts by weight of ethanol and 0.01-0.03 parts by weight of cellulose acetate are uniformly mixed, heated to 50°C, and allowed to stand for hydrolysis for more than 1 hour to prepare solution B for later use.

[0017] Next, 50-100 parts by weight of terephthalic acid, 20-45 parts by weight of ethylene glycol, and 5-10 parts by weight of dimethyl 2,6-naphthalenedicarboxylate are added to an esterification tank and mixed evenly. Then, solution A is stirred evenly and added to the esterification tank for reaction. The reaction temperature is 180-260 degrees Celsius, and the gauge pressure is 0.2-0.3 MPa. When the water output reaches 1200 ml, the pressure is released to atmospheric pressure, and the reaction product is filtered and transferred to a polycondensation tank.

[0018] Then, after thoroughly stirring solution B, add it to a polycondensation tank, and add 0.01-0.03 parts by weight of triethyl phosphate. Stir at normal pressure for 30-60 minutes, and react at a temperature of 230-280℃ and a pressure below 100Pa for 3-5 hours. Extrude and slice the reaction product from the polycondensation tank.

[0019] The slices are fed into a vacuum drying chamber and dried for more than 10 hours to obtain the high-temperature resistant PET functional masterbatch of this invention. The drying temperature in the vacuum drying chamber is 230-250 degrees Celsius, and the pressure is below 100 Pa.

[0020] Correspondingly, this application proposes a system for preparing the above-mentioned high-temperature resistant PET functional masterbatch, such as... Figure 1 The diagram shown is a structural schematic of a system for preparing high-temperature resistant PET functional masterbatch according to this application.

[0021] See Figure 1 The preparation system for high-temperature resistant PET functional masterbatch of this application includes an esterification tank 100 and a polycondensation tank 200.

[0022] The esterification tank 100 has a first inlet 101 for introducing terephthalic acid, a second inlet 102 for introducing ethylene glycol, a third inlet 103 for introducing dimethyl 2,6-naphthalenedicarboxylate, and a fourth inlet 104 connected to the first auxiliary material tank 300. The first auxiliary material tank 300, used for preparing solution A, has three inlets corresponding to the introduction of acetic anhydride, acetone, and antimony dioxide, respectively.

[0023] The polycondensation tank 200 has a fifth inlet 205 connected to the outlet of the esterification tank 100, a sixth inlet 206 connected to the outlet of the second auxiliary material tank 301, and a seventh inlet 207 for triethyl phosphate. The second auxiliary material tank 301, used for preparing solution B, has four inlets corresponding to the input of sodium dodecylbenzenesulfonate, 2-hydroxy-4-(3-triethoxysilanepropoxy)benzophenone, ethanol, and cellulose acetate, respectively.

[0024] Furthermore, the outlet of the polycondensation tank 200 is connected to at least one extruder 600, the outlet of the extruder 600 is connected to a pelletizer 700, and the outlet of the pelletizer 700 is connected to a vacuum drying tank 800.

[0025] The following reference Figure 1 The operation and preparation method of the preparation system for high-temperature resistant PET functional masterbatch of this application are further described in detail.

[0026] For example, firstly, 0.02-0.04 parts by weight of acetic anhydride and 0.03-0.05 parts by weight of acetone are introduced into the first auxiliary material tank 300 through the three inlets and mixed evenly. Then, 0.005-0.01 parts by weight of antimony dioxide are added to the first auxiliary material tank 300 and the mixture is mixed evenly and reacted for more than 30 minutes to prepare solution A for later use.

[0027] Simultaneously, through the four inlets of the second auxiliary material tank 301, 0.01-0.03 parts by weight of sodium dodecylbenzenesulfonate, 0.05-0.10 parts by weight of 2-hydroxy-4-(3-triethoxysilanepropoxy)benzophenone, 0.10-0.15 parts by weight of ethanol, and 0.01-0.03 parts by weight of cellulose acetate are respectively introduced into the second auxiliary material tank 301 and mixed evenly. The mixture is then heated to 50-60°C and allowed to stand for hydrolysis for more than 1 hour to prepare solution B for later use. Correspondingly, the second auxiliary material tank 301 is equipped with a water bath heating jacket 3011 for heating.

[0028] 50-100 parts by weight of terephthalic acid are introduced into esterification tank 100 through the first inlet 101, 20-45 parts by weight of ethylene glycol are introduced through the second inlet 102, and 5-10 parts by weight of dimethyl 2,6-naphthalenedicarboxylate are introduced through the third inlet 103. Solution A prepared in the first auxiliary material tank 300 is stirred evenly and then added to esterification tank 100 for reaction. The reaction temperature is 180-260 degrees Celsius, and the gauge pressure is 0.2-0.3 MPa. When the water output reaches 1200 ml, the pressure is released to atmospheric pressure, and the reaction product is filtered and introduced into polycondensation tank 200 through the fifth inlet 205. Correspondingly, the first auxiliary material tank 300 is equipped with a stirrer 3012 for stirring solution A.

[0029] Then, the B solution prepared in the second auxiliary material tank 301 is stirred evenly and added to the polycondensation tank 200 through the sixth inlet 206. In the polycondensation tank 200, 0.01-0.03 parts by weight of triethyl phosphate are added through the seventh inlet 207. The mixture is stirred at atmospheric pressure for 30-60 minutes, and reacted at a temperature of 230-280℃ and a pressure below 100Pa for 3-5 hours. Correspondingly, the second auxiliary material tank 301 is also equipped with a stirrer 3012 for stirring the B solution.

[0030] The reaction product in the polycondensation tank 200 is fed into the extruder 600 and extruded, then processed into chips by the pelletizer 700. The chips are then fed into the vacuum drying tank 800 and dried for more than 10 hours to obtain the high-temperature resistant PET functional masterbatch of this application. The drying temperature of the vacuum drying tank 800 is 230-250 degrees Celsius, and the pressure is below 100 Pa.

[0031] In solution A, a partial suspension containing antimony acetate can be formed, which can be fully dispersed in the system during esterification and can also serve as a catalyst for multi-system esterification, while improving the high-temperature resistance of subsequent polymerization products. In solution B, 2-hydroxy-4-(3-triethoxysilanepropoxy)benzophenone can be hydrolyzed in an alkaline environment composed of sodium dodecylbenzenesulfonate and ethanol to obtain silanol, which is then polymerized into polysiloxane chains and dispersed in an emulsion formed by cellulose acetate to form a network dispersion system. During the polycondensation reaction, the dispersed polysiloxane chains can firmly link PET and PEN, thereby significantly improving the high-temperature resistance of the functional masterbatch. The small amount of unhydrolyzed 2-hydroxy-4-(3-triethoxysilanepropoxy)benzophenone can still play a role in UV protection, further improving the anti-aging properties of the functional masterbatch.

[0032] Example 1

[0033] Mix 0.02 parts by weight of acetic anhydride with 0.03 parts by weight of acetone evenly, then add 0.005 parts by weight of antimony dioxide, mix evenly and react for 30 minutes to prepare solution A for later use.

[0034] 0.01 parts by weight of sodium dodecylbenzenesulfonate, 0.05 parts by weight of 2-hydroxy-4-(3-triethoxysilanepropoxy)benzophenone, 0.10 parts by weight of ethanol and 0.01 parts by weight of cellulose acetate are mixed evenly, heated to 50°C, and allowed to stand for hydrolysis for 1 hour to prepare solution B for later use.

[0035] 50 parts by weight of terephthalic acid, 20 parts by weight of ethylene glycol, and 5 parts by weight of dimethyl 2,6-naphthalenedicarboxylate were added to an esterification tank and mixed thoroughly. Then, solution A was stirred evenly and added to the esterification tank for reaction. The reaction temperature was 180 degrees Celsius, and the gauge pressure was 0.2 MPa. When the water output reached 1200 ml, the pressure was released to atmospheric pressure, and the reaction product was filtered and transferred to a polycondensation tank.

[0036] Then, after thoroughly stirring solution B, it was added to a polycondensation tank, and 0.01 parts by weight of triethyl phosphate was added to the tank. The mixture was stirred at atmospheric pressure for 30 minutes, and reacted at 230°C and 100 Pa for 3 hours. The reaction product in the polycondensation tank was then extruded and sliced.

[0037] The slices were fed into a vacuum drying chamber and dried for 10 hours to obtain the high-temperature resistant PET functional masterbatch of this application. The drying temperature of the vacuum drying chamber was 230 degrees Celsius, and the pressure was 100 Pa.

[0038] The prepared high-temperature resistant PET functional masterbatch was mixed with ordinary PET chips for film at proportions of 70 wt%, 85 wt%, and 100 wt% of the total film mass, respectively. The mixture was then melt-extruded, die-cast, stretched laterally and longitudinally, cooled and shaped, and wound and slit to produce a single-layer polyester film. The resulting film had a width of 1500 mm and a thickness of 30 μm.

[0039] The performance parameters of the three single-layer polyester films prepared in Example 1 were measured. The tensile strengths at 25°C were 285 MPa, 293 MPa, and 297 MPa, respectively; the transverse heat shrinkage rates at 120°C for 30 minutes were all less than 0.01%; the transverse heat shrinkage rates at 200°C for 30 minutes were 0.06%, 0.05%, and 0.04%, respectively; the light transmittances were 93.1%, 93.2%, and 93.3%, respectively; and the tensile strengths at 300°C were 167 MPa, 170 MPa, and 174 MPa, respectively.

[0040] Example 2

[0041] Mix 0.03 parts by weight of acetic anhydride with 0.04 parts by weight of acetone evenly, then add 0.008 parts by weight of antimony dioxide, mix evenly and react for 40 minutes to prepare solution A for later use.

[0042] 0.02 parts by weight of sodium dodecylbenzenesulfonate, 0.08 parts by weight of 2-hydroxy-4-(3-triethoxysilanepropoxy)benzophenone, 0.12 parts by weight of ethanol and 0.02 parts by weight of cellulose acetate were mixed evenly, heated to 55°C, and allowed to stand for hydrolysis for 1.5 hours to prepare solution B for later use.

[0043] 80 parts by weight of terephthalic acid, 35 parts by weight of ethylene glycol, and 8 parts by weight of dimethyl 2,6-naphthalenedicarboxylate were added to an esterification tank and mixed thoroughly. Then, solution A was stirred evenly and added to the esterification tank for reaction. The reaction temperature was 220 degrees Celsius, and the gauge pressure was 0.25 MPa. When the water output reached 1200 ml, the pressure was released to atmospheric pressure, and the reaction product was filtered and transferred to a polycondensation tank.

[0044] Then, after thoroughly stirring solution B, it was added to a polycondensation tank, along with 0.02 parts by weight of triethyl phosphate. The mixture was stirred at atmospheric pressure for 45 minutes, and reacted at 255°C and 90 Pa for 4 hours. The reaction product from the polycondensation tank was then extruded and sliced.

[0045] The slices were fed into a vacuum drying chamber and dried for 11 hours to obtain the high-temperature resistant PET functional masterbatch of this application. The drying temperature of the vacuum drying chamber was 240 degrees Celsius, and the pressure was 90 Pa.

[0046] The prepared high-temperature resistant PET functional masterbatch was mixed with ordinary PET chips for film at proportions of 70 wt%, 85 wt%, and 100 wt% of the total film mass, respectively. The mixture was then melt-extruded, die-cast, stretched laterally and longitudinally, cooled and shaped, and wound and slit to produce a single-layer polyester film. The resulting film had a width of 3000 mm and a thickness of 100 μm.

[0047] The performance parameters of the three single-layer polyester films prepared in Example 2 were measured. The tensile strengths at 25°C were 287 MPa, 297 MPa, and 301 MPa, respectively; the transverse heat shrinkage rates at 120°C for 30 minutes were all less than 0.01%; the transverse heat shrinkage rates at 200°C for 30 minutes were 0.05%, 0.04%, and 0.03%, respectively; the light transmittances were 92.7%, 92.8%, and 92.9%, respectively; and the tensile strengths at 300°C were 177 MPa, 176 MPa, and 179 MPa, respectively.

[0048] Example 3

[0049] Mix 0.04 parts by weight of acetic anhydride with 0.05 parts by weight of acetone evenly, then add 0.003 parts by weight of antimony dioxide, mix evenly and react for 50 minutes to prepare solution A for later use.

[0050] 0.03 parts by weight of sodium dodecylbenzenesulfonate, 0.10 parts by weight of 2-hydroxy-4-(3-triethoxysilanepropoxy)benzophenone, 0.15 parts by weight of ethanol and 0.03 parts by weight of cellulose acetate were mixed evenly, heated to 60°C, and allowed to stand for hydrolysis for 2 hours to prepare solution B for later use.

[0051] 100 parts by weight of terephthalic acid, 45 parts by weight of ethylene glycol, and 10 parts by weight of dimethyl 2,6-naphthalenedicarboxylate were added to an esterification tank and mixed thoroughly. Then, solution A was stirred evenly and added to the esterification tank for reaction. The reaction temperature was 260 degrees Celsius, and the gauge pressure was 0.3 MPa. When the water output reached 1200 ml, the pressure was released to atmospheric pressure, and the reaction product was filtered and transferred to a polycondensation tank.

[0052] Then, after thoroughly stirring solution B, it was added to a polycondensation tank, along with 0.03 parts by weight of triethyl phosphate. The mixture was stirred at atmospheric pressure for 60 minutes, and reacted at 280°C and 80 Pa for 5 hours. The reaction product from the polycondensation tank was then extruded and sliced.

[0053] The slices were fed into a vacuum drying chamber and dried for 12 hours to obtain the high-temperature resistant PET functional masterbatch of this application. The drying temperature of the vacuum drying chamber was 250 degrees Celsius, and the pressure was 80 Pa.

[0054] The prepared high-temperature resistant PET functional masterbatch was mixed with ordinary PET chips for film at proportions of 70 wt%, 85 wt%, and 100 wt% of the total film mass, respectively. The mixture was then melt-extruded, die-cast, stretched laterally and longitudinally, cooled and shaped, and wound and slit to produce a single-layer polyester film. The resulting film had a width of 5000 mm and a thickness of 250 μm.

[0055] The performance parameters of the three single-layer polyester films prepared in Example 3 were measured. The tensile strengths at 25°C were 301 MPa, 302 MPa, and 305 MPa, respectively; the transverse heat shrinkage rates at 120°C for 30 minutes were all less than 0.01%; the transverse heat shrinkage rates at 200°C for 30 minutes were 0.02%, 0.01%, and 0.03%, respectively; the light transmittances were 94.2%, 94.3%, and 94.1%, respectively; and the tensile strengths at 300°C were 171 MPa, 177 MPa, and 183 MPa, respectively.

[0056] Referring to the preparation process parameters of Examples 1-3, the proportions of some raw materials were adjusted, and comparative experiments were conducted respectively.

[0057] Comparative Example 1

[0058] The functional masterbatch was prepared according to the preparation process parameters of Example 1. During the preparation process, solution A was not used; instead, 0.005 parts by weight of antimony acetate was used to replace it in the step of adding solution A. 2-hydroxy-4-(3-triethoxysilanepropoxy)benzophenone was not added when preparing solution B. The remaining process parameters and raw material weight parts were the same as in Example 1.

[0059] Similar to Example 1, the prepared functional masterbatch was mixed with ordinary PET chips for film at 70 wt%, 85 wt%, and 100 wt% of the total film mass, respectively. The mixture was then melt-extruded, die-cast, stretched laterally and longitudinally, cooled and shaped, and wound and slit to produce a single-layer polyester film.

[0060] The performance parameters of the three single-layer polyester films prepared in Comparative Example 1 were measured. The tensile strengths at 25℃ were 288 MPa, 209 MPa, and 213 MPa, respectively; the transverse heat shrinkage rates at 120℃ for 30 minutes were 6.7%, 6.6%, and 6.5%, respectively; the transverse heat shrinkage rates at 200℃ for 30 minutes were 10.3%, 10.0%, and 9.8%, respectively; the light transmittances were 82.3%, 82.4%, and 82.1%, respectively; and the tensile strengths at 300℃ were 12 MPa, 13 MPa, and 15 MPa, respectively.

[0061] Comparative Example 2

[0062] The functional masterbatch was prepared according to the preparation process parameters of Example 2. During the preparation process, solution A was not used; instead, 0.008 parts by weight of antimony acetate was used to replace it in the step of adding solution A. Neither 2-hydroxy-4-(3-triethoxysilanepropoxy)benzophenone nor cellulose acetate was added when preparing solution B. The remaining process parameters and raw material weight parts were the same as in Example 2.

[0063] Similar to Example 2, the prepared functional masterbatch was mixed with ordinary PET chips for film at 70 wt%, 85 wt%, and 100 wt% of the total film mass, respectively. The mixture was then melt-extruded, die-cast, stretched laterally and longitudinally, cooled and shaped, and wound and slit to produce a single-layer polyester film.

[0064] The performance parameters of the three single-layer polyester films prepared in Comparative Example 2 were measured. The tensile strengths at 25℃ were 219 MPa, 218 MPa, and 221 MPa, respectively; the transverse heat shrinkage rates at 120℃ for 30 minutes were 2.5%, 2.8%, and 2.7%, respectively; the transverse heat shrinkage rates at 200℃ for 30 minutes were 3.3%, 3.4%, and 3.8%, respectively; the light transmittances were 87.8%, 87.3%, and 87.2%, respectively; and the tensile strengths at 300℃ were 42 MPa, 43 MPa, and 45 MPa, respectively.

[0065] Comparative Example 3

[0066] The functional masterbatch was prepared according to the preparation process parameters of Example 3. During the preparation process, solution A was not used; instead, 0.01 parts by weight of antimony acetate was used to replace it in the step of adding solution A. 2-hydroxy-4-(3-triethoxysilanepropoxy)benzophenone and sodium dodecylbenzenesulfonate were not added when preparing solution B. The remaining process parameters and raw material weight parts were the same as in Example 3.

[0067] Similar to Example 3, the prepared functional masterbatch was mixed with ordinary PET chips for film at 70 wt%, 85 wt%, and 100 wt% of the total film mass, respectively. The mixture was then melt-extruded, die-cast, stretched laterally and longitudinally, cooled and shaped, and wound and slit to produce a single-layer polyester film.

[0068] The performance parameters of the three single-layer polyester films prepared in Comparative Example 3 were measured. The tensile strengths at 25℃ were 188 MPa, 191 MPa, and 195 MPa, respectively; the transverse heat shrinkage rates at 120℃ for 30 minutes were 5.5%, 5.2%, and 4.6%, respectively; the transverse heat shrinkage rates at 200℃ for 30 minutes were 7.9%, 7.7%, and 7.6%, respectively; the light transmittances were 83.2%, 83.3%, and 83.0%, respectively; and the tensile strengths at 300℃ were 20 MPa, 22 MPa, and 24 MPa, respectively.

[0069] Based on experimental data, the inventors believe that this application, by employing an optimized esterification dispersion catalytic system and incorporating a network of polysiloxane chains at the initial stage of polycondensation with relatively small molecular chains, can be easily dispersed into the masterbatch without affecting the crystallinity of the polyester, thus achieving excellent high-temperature resistance. Further experiments show that Examples 1-3, after baking at 300 degrees Celsius for 30 minutes, did not exhibit significant shrinkage. Furthermore, in accelerated aging tests, the average number of color spots in Examples 1-3 over 6 months was significantly lower than that in Comparative Examples 1-3 (below 10%), indicating that the polyester film of this application possesses excellent anti-aging properties, excellent corrosion resistance, and stable quality.

[0070] Those skilled in the art should understand that although this application is described by way of multiple embodiments, not every embodiment contains only one independent technical solution. This description is merely for clarity, and those skilled in the art should understand the specification as a whole and consider the technical solutions involved in each embodiment as being able to be combined with each other to form different embodiments to understand the scope of protection of this application.

[0071] The above description is merely an illustrative embodiment of this application and is not intended to limit the scope of this application. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of this application shall fall within the scope of protection of this application.

Claims

1. A system for preparing high-temperature resistant PET functional masterbatch, characterized in that, The preparation system includes an esterification tank and a polycondensation tank; the esterification tank has a first inlet, a second inlet, a third inlet, and a fourth inlet connected to a first auxiliary material tank; the polycondensation tank has a fifth inlet connected to the outlet of the esterification tank, a sixth inlet connected to the second auxiliary material tank, and a seventh inlet; the outlet of the polycondensation tank is connected to at least one extruder, the outlet of the extruder is connected to a pelletizer, and the outlet of the pelletizer is connected to a vacuum drying tank; the first auxiliary material tank is provided with three inlets and a stirrer; the second auxiliary material tank is provided with four inlets; the second auxiliary material tank is provided with a water bath heating jacket and a stirrer.

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