Non-silicon pet low surface polarity master batch and preparation method thereof

Abstract

The application relates to a non-silicon PET low-surface-polarity master batch and a preparation method thereof, and belongs to the technical field of high-molecular compounds.The raw materials of the non-silicon PET low-surface-polarity master batch include the following in parts by weight: 80-90 parts of PET resin, 5-10 parts of carboxyl-terminated hyperbranched polyester and 2.5-5 parts of perfluoropolyether diol.The application uses perfluoropolyether diol as a release functional component, does not contain organic silicon components at all, and avoids the migration and pollution problems of silicon release agents in sensitive application fields such as electronics, optics and medical treatment.The application generates a compatibilizer with a 'double parent' structure through in-situ esterification of the carboxyl-terminated hyperbranched polyester and the perfluoropolyether diol in an extrusion process, and fundamentally solves the poor compatibility problem of the perfluoropolyether diol and the PET.

Description

Technical Field

[0001] This invention relates to the field of polymer compound technology, specifically to a non-silicon PET low surface polarity masterbatch and its preparation method. Background Technology

[0002] Polyethylene terephthalate (PET) film is widely used in electronics, optoelectronics, packaging, and medical fields due to its excellent mechanical properties, optical transparency, heat resistance, and dimensional stability. When used as a release film, PET film needs to be endowed with low surface energy and good peel performance to meet its application requirements in adhesive products, electronic component encapsulation, and optical film protection.

[0003] Currently, most commercially available PET release films are prepared by surface coating with silicone-containing release agents (such as polydimethylsiloxane, silicone resin, etc.) or by blending and modifying with silicone-containing masterbatches. While silicone-containing release films can meet the needs of most conventional applications, they have significant limitations in certain specific fields: the silicone component easily migrates from the film surface to the substrate, contaminating the surface of the protected object and affecting the reliability of subsequent printing, coating, or bonding processes; under high temperature, high humidity, or strong shear conditions, the stability of silicone is insufficient, which may lead to deterioration of release performance. In addition, in the manufacturing process of electronic components, silicon contamination may cause electrical faults; therefore, some high-end application fields explicitly require the use of "silicone-free" release films.

[0004] To address these issues, researchers have attempted to develop silicone-free release film technology. For example, CN118085369A discloses a non-silicone PET release film used as a protective film for silicone rollers, employing a fluorinated release agent coated onto the surface of a PET base film to achieve a silicone-free design. CN111410925A discloses a method for preparing a non-silicone PET release film, obtaining a silicone-free release film by coating the surface of a PET substrate with a release agent composed of polyacrylol, acetone, MDI, etc. However, the above technologies all employ coating methods, which are relatively complex processes. The adhesion between the release layer and the substrate depends on the action of the anchoring agent, posing a risk of release layer detachment under long-term use or high-temperature conditions. Furthermore, coating methods require the use of large amounts of organic solvents, resulting in significant environmental pressure and high production costs.

[0005] Therefore, it is urgent to optimize the formulation of silicone-free release films and improve their preparation methods. Summary of the Invention

[0006] The purpose of this invention is to replace organosilicon with perfluoropolyether diol to avoid the migration and contamination problems of silicone-based release agents, and to achieve uniform dispersion of perfluoropolyether diol in PET matrix by using carboxyl-terminated hyperbranched polyester through in-situ compatibilization technology.

[0007] To achieve the above objectives, the present invention provides a non-silicone PET low surface polarity masterbatch, the raw materials comprising, by weight: 80-90 parts PET resin, 5-10 parts carboxyl-terminated hyperbranched polyester, and 2.5-5 parts perfluoropolyether diol.

[0008] Furthermore, the number-average molecular weight of the end-carboxyl hyperbranched polyester is 2000-12000 g / mol, and the acid value is 200-300 mg KOH / g.

[0009] Furthermore, the perfluoropolyether diol has a number-average molecular weight of 1000-5000 g / mol and a hydroxyl value of 20-100 mg KOH / g.

[0010] Furthermore, the intrinsic viscosity of the PET resin is 0.60-0.80 dL / g.

[0011] Furthermore, the raw materials also include, by weight, 0.1-0.5 parts antioxidant and 0.5-2 parts lubricant.

[0012] This invention also provides a method for preparing a non-silicone PET low surface polarity masterbatch, comprising, Weigh out 80-90 parts of PET resin, 5-10 parts of carboxyl-terminated hyperbranched polyester, and 2.5-5 parts of perfluoropolyether diol by weight, and then mix them to obtain a premixed material. The premixed material is melt-blended and extruded. During the melt-blending process, the carboxyl groups of the carboxyl hyperbranched polyester undergo an in-situ esterification reaction with the hydroxyl groups of the perfluoropolyether diol to generate a hyperbranched polyester grafted with a perfluoropolyether compatibilizer. The extrudate is cooled and pelletized to obtain a non-silicone PET low surface polarity masterbatch.

[0013] Furthermore, the moisture content of the PET resin and the carboxyl-terminated hyperbranched polyester is less than 50 ppm; The perfluoropolyether diol is mixed at a temperature of 50-70°C.

[0014] Furthermore, the melt blending temperature is 250-260°C.

[0015] This invention also provides a non-silicone PET low surface polarity film, which is obtained by mixing the above-mentioned non-silicone PET low surface polarity masterbatch and film-grade polyester chips in a ratio of 1:3-5, forming by casting or biaxial stretching, and then annealing at 120-150°C for 30-60 minutes.

[0016] The present invention also provides the application of the above-mentioned non-silicon PET low surface polarity masterbatch or the above-mentioned non-silicon PET low surface polarity film in the fields of electronic component packaging, optical film protection, and medical device packaging.

[0017] Compared with the prior art, the beneficial effects of the present invention include: This invention uses perfluoropolyether diol as the release functional component, which is completely free of organosilicon components, thus avoiding the migration and contamination problems of silicone-based release agents in sensitive application fields such as electronics, optics, and medicine.

[0018] The three-dimensional branched structure of hyperbranched polyester provides numerous reaction sites, and its polyester skeleton, similar to that of PET, ensures good compatibility with the matrix. The grafted perfluoropolyether diol segments are compatible with free perfluoropolyether diols, forming a "bridging" effect. By employing an in-situ esterification reaction between carboxyl-terminated hyperbranched polyester and perfluoropolyether diols during extrusion, a compatibilizer with an amphiphilic structure is generated, fundamentally solving the problem of poor compatibility between perfluoropolyether diols and PET.

[0019] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 Microscopic images of the non-silicon PET low surface polarity masterbatch prepared in Example 1 of the present invention after being cast into a film are shown. Figure 2 Microscopic images of the non-silicon PET low surface polarity masterbatch prepared in Example 2 of the present invention after being cast into a film are shown. Figure 3 Microscopic images of the non-silicon PET low surface polarity masterbatch prepared in Example 3 of the present invention after being cast into a film are shown. Figure 4 Microscopic images of the non-silicon PET low surface polarity masterbatch prepared in Comparative Example 1 of the present invention after being cast into a film are shown. Figure 5 Microscopic images of commercially available silicone-containing PET release film masterbatch after casting are shown. Detailed Implementation

[0022] Perfluoropolyether diols possess lower surface energy (18-22 mN / m) and superior chemical stability and high-temperature resistance compared to silicones, making them an ideal choice for silicone-free release agents. However, perfluoropolyether diols and PET have vastly different polarities and solubilities, and are thermodynamically incompatible. Direct melt blending leads to severe macroscopic phase separation. Perfluoropolyether diols disperse in the PET matrix as micron-sized droplets, failing to effectively reduce film surface energy and instead significantly decreasing film transparency, mechanical properties, and processing stability. In contrast, the three-dimensional branched structure of hyperbranched polyesters provides numerous reaction sites, and its polyester skeleton, similar to PET, ensures good compatibility with the matrix.

[0023] The concept of this invention lies in using a terminal carboxyl hyperbranched polyester with a large number of terminal carboxyl groups in its molecular structure. During melt processing, this polyester undergoes an esterification reaction with the hydroxyl groups of a perfluoropolyether diol, thereby grafting the perfluoropolyether diol onto the free perfluoropolyether diol. The grafted perfluoropolyether diol segments are compatible with the free perfluoropolyether diol, forming a "bridge" effect and creating an amphiphilic compatibilizer in situ. This in-situ compatibilization method achieves uniform dispersion of the perfluoropolyether diol in the PET matrix, fundamentally solving the problem of poor compatibility between perfluoropolyether diol and PET.

[0024] Therefore, this invention designs a non-silicone PET low surface polarity masterbatch, the raw materials of which include, by weight: 80-90 parts PET resin, 5-10 parts carboxyl-terminated hyperbranched polyester, and 2.5-5 parts perfluoropolyether diol.

[0025] Preferably, the number-average molecular weight of the end-carboxyl hyperbranched polyester is 2000-12000 g / mol, and the acid value is 200-300 mg KOH / g.

[0026] Preferably, the perfluoropolyether diol has a number-average molecular weight of 1000-5000 g / mol and a hydroxyl value of 20-100 mg KOH / g.

[0027] Preferably, the intrinsic viscosity of the PET resin is 0.60-0.80 dL / g.

[0028] Preferably, the raw materials further include, by weight, 0.1-0.5 parts of antioxidant and 0.5-2 parts of lubricant.

[0029] It should be noted that the present invention does not strictly limit the specific types of antioxidants and lubricants. The antioxidant can be at least one of hindered phenolic antioxidants, phosphite antioxidants, etc. When a hindered phenolic antioxidant is selected, it can be at least one of antioxidant 1010, antioxidant 1076, and antioxidant 1098; when a phosphite antioxidant is selected, it can be at least one of antioxidant 168, antioxidant 626, and antioxidant 618. In some preferred embodiments, the antioxidant is a mixture of primary antioxidant 1010 and secondary antioxidant 168 in a 1:1 mass ratio. The lubricant can be at least one of pentaerythritol stearate, montan wax, polyethylene wax, and polar wax. In some preferred embodiments, the lubricant is selected as a polar wax. Polar waxes are polar polymers containing carboxyl, hydroxyl, and ester groups, obtained by oxidation or grafting modification of non-polar waxes. These functional groups can chemically react with the polar groups of PET or form strong intermolecular forces. At the same time, the long-chain alkyl part of the wax is compatible with non-polar components, and can play a dual role as a "bridge" and "lubricant" in composite non-silicone PET materials.

[0030] Accordingly, the present invention also provides a method for preparing a non-silicone PET low surface polarity masterbatch, comprising, Weigh out 80-90 parts of PET resin, 5-10 parts of carboxyl-terminated hyperbranched polyester, and 2.5-5 parts of perfluoropolyether diol by weight, and then mix them to obtain a premixed material. The premixed material is melt-blended and extruded. During the melt-blending process, the carboxyl groups of the carboxyl hyperbranched polyester undergo an in-situ esterification reaction with the hydroxyl groups of the perfluoropolyether diol to generate a hyperbranched polyester grafted with a perfluoropolyether compatibilizer. The extrudate is cooled and pelletized to obtain a non-silicone PET low surface polarity masterbatch.

[0031] Preferably, the moisture content of the PET resin and the carboxyl-terminated hyperbranched polyester is less than 50 ppm. Specifically, the PET resin and the carboxyl-terminated hyperbranched polyester can be vacuum dried at 100-130°C for 4-8 hours.

[0032] Preferably, the perfluoropolyether diol is further preheated so that the temperature during mixing is 50-70°C.

[0033] Preferably, the premixed material is added to a twin-screw extruder for melt blending and extrusion. The temperature settings of the twin-screw extruder are: feeding section 230-240℃, melt reaction section 250-265℃, die head 250-260℃; screw speed 150-300 rpm, residence time 1-3 minutes, and feed rate 150 kg / h to 220 kg / h.

[0034] Preferably, if agglomeration occurs after mixing the perfluoropolyether diol and the carboxyl-terminated hyperbranched polyester, a side-feeding method is adopted: the PET resin and the carboxyl-terminated hyperbranched polyester are added from the main feed port, and the perfluoropolyether diol is added from the side of the extruder in zone 2-3 through a metering pump.

[0035] Preferably, the twin-screw extruder is a co-rotating parallel twin-screw extruder with a length-to-diameter ratio of 40-52:1.

[0036] The non-silicone PET low surface polarity masterbatch and film-grade polyester chips are mixed in a ratio of 1:3-5, and after casting or biaxial stretching, annealing is performed at 120-150℃ for 30-60 minutes to obtain a non-silicone PET low surface polarity film.

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the invention, are intended to cover non-exclusive inclusion.

[0039] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] The present invention will be further described in detail below through specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or in accordance with the product instructions. Reagents or instruments used that do not specify the manufacturer are all conventional products that can be obtained commercially.

[0041] Description of some of the raw materials used in the examples and comparative examples: PET resin: Sinopec Yizheng Chemical Fiber Co., Ltd., FG600, film grade, intrinsic viscosity 0.65 dL / g; Carboxyl-terminated hyperbranched polyester: Wuhan Hyperbranched Resin Technology Co., Ltd., C203, acid value 260mg KOH / g, Mn=5200g / mol; Perfluoropolyether diol: Hubei Xinyuhong Biomedical Technology Co., Ltd., hydroxyl value 80mg KOH / g, Mn=4000g / mol; Polar wax: Puli New Material Technology Co., Ltd., CP15M, acid value 17mg KOH / g, viscosity 500mPa·s@120℃; Silicone-containing PET release film masterbatch: commercially available, silicon content: 2%.

[0042] Example 1 A method for preparing a non-silicone PET low surface polarity masterbatch includes the following steps: (1) The PET resin and the carboxyl-terminated hyperbranched polyester were vacuum dried at 120°C for 6 hours and the moisture content was found to be <50ppm; the perfluoropolyether diol was preheated to 60°C for later use. (2) Weigh 82.5 parts of PET resin, 10 parts of carboxyl-terminated hyperbranched polyester, 5 parts of perfluoropolyether diol, 0.5 parts of antioxidant, and 2 parts of polar wax according to the weight ratio, and then add them to a high-speed mixer and mix for 10 minutes to obtain a mixture. The antioxidant is composed of antioxidant 1010 and antioxidant 168 mixed in a mass ratio of 1:1. (3) Add the mixture to a twin-screw extruder with a length-to-diameter ratio of 44:1. Set the screw speed of the twin-screw extruder to 200 rpm, the feed rate to 160 kg / h, the residence time to about 2 minutes, and the temperature of the hot zone of the barrel to 90 / 150 / 200 / 235 / 255 / 260 / 265 / 265 / 260 / 255 / 250℃. Perform melt blending and extrusion. (4) The extruded strip is cooled by water, dried by air and granulated to obtain non-silicone PET low surface polarity masterbatch.

[0043] Example 2 A method for preparing a non-silicone PET low surface polarity masterbatch includes the following steps: (1) The PET resin and the carboxyl-terminated hyperbranched polyester were vacuum dried at 120°C for 6 hours and the moisture content was found to be <50ppm; the perfluoropolyether diol was preheated to 60°C for later use. (2) Weigh 87.5 parts of PET resin, 5 parts of carboxyl-terminated hyperbranched polyester, 5 parts of perfluoropolyether diol, 0.5 parts of antioxidant, and 2 parts of polar wax by weight, and then add them to a high-speed mixer and mix for 10 minutes to obtain a mixture. The antioxidant is composed of antioxidant 1010 and antioxidant 168 mixed in a mass ratio of 1:1. (3) Add the mixture to a twin-screw extruder with a length-to-diameter ratio of 44:1. Set the screw speed of the twin-screw extruder to 200 rpm, the feed rate to 160 kg / h, the residence time to about 2 minutes, and the temperature of the hot zone of the barrel to 90 / 150 / 200 / 235 / 255 / 260 / 265 / 265 / 260 / 255 / 250℃. Perform melt blending and extrusion. (4) The extruded strip is cooled by water, dried by air and granulated to obtain non-silicone PET low surface polarity masterbatch.

[0044] Example 3 A method for preparing a non-silicone PET low surface polarity masterbatch includes the following steps: (1) The PET resin and the carboxyl-terminated hyperbranched polyester were vacuum dried at 120°C for 6 hours and the moisture content was found to be <50ppm; the perfluoropolyether diol was preheated to 60°C for later use. (2) Weigh 90 parts of PET resin, 2.5 parts of carboxyl-terminated hyperbranched polyester, 5 parts of perfluoropolyether diol, 0.5 parts of antioxidant, and 2 parts of polar wax according to the weight ratio, and then add them to a high-speed mixer and mix for 10 minutes to obtain a mixture. The antioxidant is composed of antioxidant 1010 and antioxidant 168 mixed in a mass ratio of 1:1. (3) Add the mixture to a twin-screw extruder with a length-to-diameter ratio of 44:1. Set the screw speed of the twin-screw extruder to 200 rpm, the feed rate to 160 kg / h, the residence time to about 2 minutes, and the temperature of the hot zone of the barrel to 90 / 150 / 200 / 235 / 255 / 260 / 265 / 265 / 260 / 255 / 250℃. Perform melt blending and extrusion. (4) The extruded strip is cooled by water, dried by air and granulated to obtain non-silicone PET low surface polarity masterbatch.

[0045] Comparative Example 1 A method for preparing a non-silicone PET low surface polarity masterbatch includes the following steps: (1) PET resin and carboxyl-terminated hyperbranched polyester were vacuum dried at 120°C for 6 hours, and the moisture content was found to be <50ppm; (2) Weigh 92.5 parts of PET resin, 5 parts of perfluoropolyether diol, 0.5 parts of antioxidant, and 2 parts of polar wax by weight, and then add them to a high-speed mixer and mix for 10 minutes to obtain a mixture. The antioxidant is composed of antioxidant 1010 and antioxidant 168 mixed in a mass ratio of 1:1. (3) Add the mixture to a twin-screw extruder with a length-to-diameter ratio of 44:1. Set the screw speed of the twin-screw extruder to 200 rpm, the feed rate to 160 kg / h, the residence time to about 2 minutes, and the temperature of the hot zone of the barrel to 90 / 150 / 200 / 235 / 255 / 260 / 265 / 265 / 260 / 255 / 250℃. Perform melt blending and extrusion. (4) The extruded strip is cooled by water, dried by air and granulated to obtain non-silicone PET low surface polarity masterbatch.

[0046] Comparative Example 2 Commercially available silicone-containing PET release film masterbatch contains 2% silicon.

[0047] The masterbatch materials prepared in the examples and comparative examples were dried with film-grade polyester chips at 120°C for 4 hours. Then, the masterbatch materials were mixed with film-grade polyester chips at a ratio of 2:8 and a film with a thickness of about 80 μm was prepared at 260°C using a small casting machine. Finally, the film was annealed at 120°C for 30 minutes.

[0048] Test case The haze and light transmittance of the films obtained from the masterbatch materials of the examples and comparative examples before and after annealing were tested according to the national standard GB / T 2410-2008 "Determination of transmittance and haze of transparent plastics". The peel force and aging peel force of the films obtained from the masterbatch materials of the examples and comparative examples before and after annealing were tested according to the national standard GB / T 25256-2010 "Test method for 180° peel force and residual adhesion of optical functional films and release films". These results are shown in Table 1.

[0049] Table 1. Performance test results of the film before and after annealing

[0050] As can be seen from Example 1 and Comparative Example 2 in Table 1, the masterbatch preparation method of the present invention is feasible. Under the same conditions, the haze, transmittance, peel strength, and aging peel strength are comparable to those of commercially available silicon-containing release film masterbatches, and there is no significant difference in appearance. (See...) Figure 1 , Figure 5 ) As can be seen from Examples 1-3 and Comparative Example 1 in Table 1, the carboxyl-terminated hyperbranched polyester has a significant impact on the compatibility of perfluoropolyether diol with PET. In Comparative Example 1, without the addition of carboxyl-terminated hyperbranched polyester, the compatibility between perfluoropolyether diol and PET is very poor, and cross-linking occurs. This not only fails to reduce peel strength but also affects the film appearance, haze, and light transmittance. From Examples 1-3, it can be seen that the ratio of carboxyl-terminated hyperbranched polyester to perfluoropolyether diol has a significant impact on the dispersion effect and surface energy reduction. In Example 1, the mass ratio of carboxyl-terminated hyperbranched polyester to perfluoropolyether diol is 10:5. The best effect is achieved when the molar ratio of carboxyl to hydroxyl groups is approximately 2:1, indicating that an appropriate excess of carboxyl groups is beneficial for the full grafting of perfluoropolyether diol while avoiding the risk of cross-linking due to excessive hydroxyl groups. (See...) Figure 1 , Figure 2 , Figure 3 , Figure 4 ) From Examples 1-3 and Comparative Examples 1-2 in Table 1, it was found that although the haze and transmittance of the film decreased slightly after annealing, this is because annealing (heat treatment at an appropriate temperature) allows the polymer chain segments to gain energy for rearrangement, leading to increased crystallinity. The grains may grow or form a more complete crystal structure. These microcrystals have a different refractive index than the surrounding amorphous regions, creating more scattering centers within the material, thus increasing light scattering and slightly decreasing haze and transmittance. However, the peel strength and aging peel strength are improved.

[0051] These results demonstrate that the non-silicone PET low surface polarity masterbatch prepared by this invention can be directly used in biaxially oriented polyester film (BOPET) production lines to prepare release films through conventional melt extrusion and biaxial stretching processes, without the need for additional coating steps.

[0052] In summary, this invention achieves uniform dispersion of the perfluoropolyether diol in a PET matrix by generating a compatibilizer with an amphiphilic structure through in-situ esterification of carboxyl-terminated hyperbranched polyester with a perfluoropolyether diol. After annealing, the grafted and free perfluoropolyether diol segments spontaneously migrate and accumulate on the film surface, forming a stable low surface energy layer. The peel strength and aging peel strength are both ≤200 g / inch, the haze is less than 5%, and the thermal stability is excellent, meeting the application requirements of non-silicone release films. Furthermore, due to the lower surface energy and better chemical stability of the perfluoropolyether diol compared to organosilicon, the film of this invention maintains stable release properties even under high temperature and high humidity conditions.

[0053] The technical solution of this invention is simple in process, has controllable cost, and has broad prospects for industrial application, with the following advantages: 1. The release functional components are uniformly dispersed inside the matrix, rather than just adhering to the surface, resulting in more durable and stable release performance; 2. Avoid the coating process, simplify the process flow, and reduce production costs; 3. No organic solvents are required, resulting in less environmental impact; 4. The masterbatch form facilitates storage, transportation, and industrial application.

[0054] 5. It fills the technological gap in blended non-silicone PET release film masterbatch and has significant industrial value.

[0055] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A non-silicone PET low surface polarity masterbatch, characterized in that, Raw materials, by weight, include: 80-90 parts PET resin, 5-10 parts carboxyl-terminated hyperbranched polyester, and 2.5-5 parts perfluoropolyether diol.

2. The non-silicone PET low surface polarity masterbatch according to claim 1, characterized in that, The number-average molecular weight of the end-carboxyl hyperbranched polyester is 2000-12000 g / mol, and the acid value is 200-300 mg KOH / g.

3. The non-silicone PET low surface polarity masterbatch according to claim 1, characterized in that, The perfluoropolyether diol has a number-average molecular weight of 1000-5000 g / mol and a hydroxyl value of 20-100 mg KOH / g.

4. The non-silicone PET low surface polarity masterbatch according to claim 1, characterized in that, The intrinsic viscosity of the PET resin is 0.60-0.80 dL / g.

5. The non-silicone PET low surface polarity masterbatch according to claim 1, characterized in that, The raw materials also include, by weight: 0.1-0.5 parts antioxidant and 0.5-2 parts lubricant.

6. A method for preparing a non-silicone PET low surface polarity masterbatch, characterized in that, include, Weigh out 80-90 parts of PET resin, 5-10 parts of carboxyl-terminated hyperbranched polyester, and 2.5-5 parts of perfluoropolyether diol by weight, and then mix them to obtain a premixed material. The premixed material is melt-blended and extruded. During the melt-blending process, the carboxyl groups of the carboxyl hyperbranched polyester undergo an in-situ esterification reaction with the hydroxyl groups of the perfluoropolyether diol to generate a hyperbranched polyester grafted with a perfluoropolyether compatibilizer. The extrudate is cooled and pelletized to obtain a non-silicone PET low surface polarity masterbatch.

7. The method for preparing non-silicone PET low surface polarity masterbatch according to claim 6, characterized in that, The moisture content of the PET resin and the carboxyl-terminated hyperbranched polyester is less than 50 ppm; The perfluoropolyether diol is mixed at a temperature of 50-70°C.

8. The method for preparing non-silicone PET low surface polarity masterbatch according to claim 6, characterized in that, The melt blending temperature is 250-260℃.

9. A non-silicone PET low surface polarity film, characterized in that, The non-silicone PET low surface polarity masterbatch as described in any one of claims 1-5 and film-grade polyester chips are mixed in a ratio of 1:3-5, and after being cast or biaxially stretched, they are annealed at 120-150°C for 30-60 minutes to obtain the final product.

10. The application of a non-silicone PET low surface polarity masterbatch as described in any one of claims 1-5 or a non-silicone PET low surface polarity film as described in claim 9 in the fields of electronic component packaging, optical film protection, and medical device packaging.

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