A hydrolysis-resistant PET masterbatch and its preparation method and application

Abstract

The present invention discloses a hydrolysis-resistant PET masterbatch, its preparation method, and application. The preparation method comprises the following steps: extruding the raw materials of the hydrolysis-resistant PET masterbatch through a single-screw extruder, cooling and granulating to obtain the hydrolysis-resistant PET masterbatch; the raw materials of the hydrolysis-resistant PET masterbatch include a polymeric hydrolysis-resistant agent and a PET resin; the granulation temperature is 80-100°C; and the amount of the polymeric hydrolysis-resistant agent added is 10%-50%, where the percentage is the mass percentage of the polymeric hydrolysis-resistant agent to the raw materials of the hydrolysis-resistant PET masterbatch. The hydrolysis-resistant PET masterbatch of the present invention has low viscosity, excellent color, and a high effective content of the hydrolysis-resistant agent. It exhibits excellent hydrolysis resistance during use in film or fiber spinning, effectively preventing crosslinking and ensuring the quality of downstream products.

Description

Technical Field

[0001] The invention relates to a hydrolysis-resistant PET masterbatch and a preparation method and application thereof. Background Art

[0002] Polyethylene terephthalate (PET) is a thermoplastic polyester material with excellent performance. Due to its highly symmetrical molecular structure, it is easy to crystallize and orient during processing, and has excellent film-forming and moldability. PET resin has good creep resistance, fatigue resistance, and friction resistance, good weather resistance and chemical resistance, and excellent electrical insulation properties. It is widely used in fiber spinning, film sheets, packaging bottles, electronic appliances, automotive parts and other fields. However, PET is a polar polymer material with ester bonds in its main molecular chain. During actual use, especially in high temperature and high humidity environments, the ester bonds will undergo hydrolysis reactions under the erosion of water vapor, resulting in molecular chain breakage and material aging and degradation, which seriously affects the service life of the material products.

[0003] Carbodiimide compounds can be used as excellent anti-hydrolysis agents in PET materials to extend the service life of PET materials. In commercial applications, common carbodiimide compounds include two categories: monomeric carbodiimides and polymeric carbodiimides. Monomeric carbodiimides are small molecules that may precipitate when used in material processing, especially in membrane and fiber spinning. Therefore, polymeric carbodiimides are often chosen in actual use. Polymeric carbodiimides are less reactive than monomeric ones, react slowly in the substrate, and have a long hydrolysis resistance, which can further extend the service life of the substrate. However, the molecular structure of polymeric carbodiimides contains multiple carbodiimide active groups, which easily form cross-links during material processing.

[0004] Carbodiimide compounds are used as anti-hydrolysis agents in PET materials. The addition amount is generally relatively low. Direct mixing and processing will result in uneven dispersion and inconvenient addition. Therefore, masterbatch is usually added for blending. Masterbatch is usually manufactured by twin-screw extrusion at high temperature. During this manufacturing process, the anti-hydrolysis agent powder and PET particles are subjected to high temperatures and strong shearing of the twin screw. Some of the anti-hydrolysis agent will react with the PET particles, resulting in a decrease in the remaining effective anti-hydrolysis content. At the same time, the shearing action of the twin screw will further cause degradation of the anti-hydrolysis agent and PET particles, resulting in poor material performance. In addition, the masterbatch will undergo another thermal history and screw shearing during use, which greatly increases the risk of cross-linking of the PET molecular chain. This may form crystal points in film manufacturing, affecting the mechanical properties of the material. For example, during the spinning process, local cross-linking may cause spindle plugging, affecting the normal spinning process.

[0005] Therefore, in the field of PET film or spinning, it is a technical problem to be solved urgently to provide an anti-hydrolysis agent PET masterbatch with excellent anti-hydrolysis effect, avoid cross-linking formation, and excellent color.

[0006] At present, the existing technology has not seen the use of single-screw extruders in the field of resin manufacturing to solve the above technical problems. Summary of the Invention

[0007] The present invention aims to overcome the risk of crosslinking during the spinning process of films or fibers produced using conventional hydrolysis-resistant PET masterbatches. The present invention provides a hydrolysis-resistant PET masterbatch, its preparation method, and its application. The hydrolysis-resistant PET masterbatch of the present invention exhibits low viscosity, excellent color, and a high effective content of an anti-hydrolysis agent. It exhibits excellent hydrolysis resistance during the spinning process of films or fibers, effectively preventing crosslinking and ensuring the quality of downstream products.

[0008] PET masterbatch will experience two high-temperature thermal histories and screw shearing effects during the application process, the first time is the masterbatch manufacturing process, and the second time is the masterbatch use process. The high-temperature thermal history and screw shearing effect are inevitable during the second use of the masterbatch. How to avoid the high-temperature thermal history and the strong shearing effect of the twin-screw during the masterbatch preparation process is a technical problem that needs to be solved urgently in this field. The present invention has found in the research that the use of a single-screw extruder and the extrusion processing near the softening point of the anti-hydrolysis agent and the PET substrate can obtain a hydrolysis-resistant PET masterbatch. The masterbatch has not undergone a high-temperature thermal history and the strong shearing effect of the twin-screw, which reduces the degree of degradation of the PET substrate and the reaction degree of the anti-hydrolysis agent and the PET substrate. The obtained PET masterbatch has excellent color and the effective ingredients of the anti-hydrolysis agent are also increased.

[0009] The present invention solves the above technical problems through the following technical solutions.

[0010] The present invention provides a method for preparing hydrolysis-resistant PET masterbatch, which comprises the following steps: extruding the raw materials of the hydrolysis-resistant PET masterbatch through a single-screw extruder, cooling and granulating to obtain the hydrolysis-resistant PET masterbatch;

[0011] The raw materials of the anti-hydrolysis PET masterbatch include a polymeric anti-hydrolysis agent and a PET resin;

[0012] The granulation temperature is 80-100°C;

[0013] The addition amount of the polymeric anti-hydrolysis agent is 10% to 50%, where the percentage is the mass percentage of the polymeric anti-hydrolysis agent in the raw material of the anti-hydrolysis PET masterbatch.

[0014] In the present invention, the structure of the single-screw extruder generally includes a feed port, a single screw and a cavity shell; the single screw is located in the cavity shell, and the cavity shell is connected to the feed port.

[0015] In the present invention, the single-screw extruder may be a conventional single-screw extruder in the art, such as a 200-type single-screw hot-melt extrusion granulator.

[0016] In the present invention, the single-screw extruder may be equipped with an automatic temperature control system. The automatic temperature control system controls the temperature of the granulation.

[0017] When the single-screw extruder is equipped with an automatic temperature control system, the automatic temperature control system is generally installed on the cavity housing. The automatic temperature control system can be a conventional automatic temperature control system in the art. For example, the automatic temperature control system that can be installed in a model 200 single-screw hot-melt extruder granulator can be used.

[0018] For example, the automatic temperature control system may be configured as follows:

[0019] A condenser is arranged inside the outer shell of the cavity, one end of the condenser is connected to a water inlet pipe, a valve opening control device is installed on the water inlet pipe, a water outlet pipe is arranged at the top center of the condenser shell, a thermometer is installed on the inner wall of the water outlet pipe, the thermometer is connected to the single-chip microcomputer controller through a signal line, and the signal output end of the single-chip microcomputer controller is connected to the valve opening control device.

[0020] In the horizontal direction, the single screw further comprises a blade connection at one end away from the feed port. The number of blades connected to the blade connection is preferably 3. The angle between each blade is preferably 120°.

[0021] Wherein, in the horizontal direction, the cavity shell further includes a die head at one end away from the feeding port.

[0022] Wherein, in the horizontal direction, the end of the single screw near the feeding port further includes a connecting piece, which is generally connected to the motor.

[0023] In the present invention, the granulation temperature is preferably 90-100°C, for example 95°C.

[0024] In the present invention, the aspect ratio of the single-screw extruder may be (20-30):1, for example, 25:1.

[0025] In the present invention, the rotation speed of the single-screw extruder may be 20 to 50 rpm, for example, 30 rpm.

[0026] In the present invention, the polymeric anti-hydrolysis agent is preferably a polymeric carbodiimide; more preferably, the structure of the polymeric anti-hydrolysis agent is as shown in Formula I:

[0027]

[0028] Formula I

[0029] In formula I, n is 2 to 50;

[0030] R is one or more of a C1-C9 alkyl-substituted arylene group, a C1-C9 alkyl-substituted cycloalkylene group, a C1-C12 alkyl-substituted biphenyl group, a "bridged structure consisting of a C6-C12 alkyl-substituted phenyl group and a C1-C4 alkylene group", a "bridged structure consisting of a C6-C12 alkyl-substituted cycloalkyl group and a C1-C4 alkylene group", and a naphthyl group;

[0031] R1 is one or more of -NCN-R2, -NHCONHR2 and -NHCOOR3; wherein, R2 is one or more of C1~C12-alkyl, C6~C12-cycloalkyl and "C7~C18-aralkyl or aryl"; R3 is one or more of C1~C12-alkyl, C6~C12-cycloalkyl, "C7~C18-aralkyl or aryl" and "unsaturated alkyl or alkoxypolyoxyalkylene having 2 to 22 carbon atoms".

[0032] In formula I, n is preferably 3 to 30, more preferably 5 to 15, for example 6, 7, 8, 9, 10, 12, 13 or 14.

[0033] In formula I, R is preferably 2,4,6-triisopropylphenyl.

[0034] In formula I, R1 is preferably 2,6-diisopropylphenyl.

[0035] In the present invention, the polymeric anti-hydrolysis agent is preferably purchased from LANXESS Germany Co., Ltd., model P anti-hydrolysis agent (molecular weight about 3000g / moL). The structural formula of this type of anti-hydrolysis agent is

[0036] In the present invention, the addition amount of the polymeric anti-hydrolysis agent is preferably 15% to 30%, for example 20%, 25%, or 28%. Experimental research has found that if the addition amount of the polymeric anti-hydrolysis agent is too low, more masterbatch needs to be added during downstream use; if the addition amount is too high, less masterbatch needs to be added during downstream use, resulting in uneven mixing and dispersion.

[0037] In the present invention, the PET resin may be a conventional PET resin in the art, for example, a PET resin purchased from Sinopec Yizheng Chemical Fiber Co., Ltd. with a model number of FG728.

[0038] The present invention also provides a hydrolysis-resistant PET masterbatch, which is prepared by the above-mentioned preparation method of the hydrolysis-resistant PET masterbatch.

[0039] The present invention also provides a use of the aforementioned hydrolysis-resistant PET masterbatch as a raw material in the field of film or fiber spinning.

[0040] On the basis of conforming to the common sense in this field, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0041] The reagents and raw materials used in the present invention are commercially available.

[0042] The positive progress effect of the present invention is:

[0043] 1. The hydrolysis-resistant PET masterbatch of the present invention is manufactured under single-screw low-temperature conditions, which reduces the risk of cross-linking during the use of the masterbatch and ensures the quality of downstream products.

[0044] 2. The hydrolysis-resistant PET masterbatch of the present invention has not been subjected to high-temperature thermal history and twin-screw shearing, thereby ensuring the initial color of the masterbatch, which is beneficial to the color control of the product during downstream use.

[0045] 3. The degree of reaction of the anti-hydrolysis agent involved in the production process of the anti-hydrolysis PET masterbatch of the present invention is low, which effectively ensures the effective ingredients of the anti-hydrolysis agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic structural diagram of the single-screw extruder used in the present invention.

[0047] Reference numerals:

[0048] Feeding port 1

[0049] Material 2

[0050] Connector 3

[0051] Single screw 4

[0052] Cavity shell 5

[0053] Blade connection 6

[0054] Blade 7

[0055] Die head 8

[0056] Figure 2 This is the color diagram of the hydrolysis-resistant PET masterbatch prepared in Example 1.

[0057] Figure 3 This is the appearance color diagram of the PET masterbatch prepared in Comparative Example 1. DETAILED DESCRIPTION

[0058] The present invention is further illustrated by way of examples below, but the present invention is not limited to the scope of the examples. Experimental methods in the following examples where specific conditions are not specified were performed according to conventional methods and conditions, or selected according to the product specifications.

[0059] In the following examples and comparative examples:

[0060] The resin used was PET resin purchased from Sinopec Yizheng Chemical Fiber Co., Ltd., model FG728.

[0061] The polymeric anti-hydrolysis agent (anti-hydrolysis agent powder) used was purchased from Lanxess Germany Co., Ltd., model P.

[0062] The twin-screw extruder model used is MYSJ-35.

[0063] The single screw extruder used is a 200 type single screw hot melt extrusion granulator equipped with an automatic temperature control system.

[0064] The structural diagram of the single screw extruder used is as follows Figure 1 As shown:

[0065] The single-screw extruder mainly consists of a feed port 1, a connector 3, a single screw 4, a cavity shell 5, a blade connector 6, a blade 7 and a die head 8. Among them, the connector 3 is connected to the motor, the die head 8, the blade 7 and the screw 4 are coaxial, the number of blades connected to the blade connector 6 is 3, and the angle between each blade is 120°.

[0066] The cavity shell is equipped with an automatic temperature control system. The automatic temperature control system used in the present invention can be a conventional automatic temperature control system in the art. For example, an automatic temperature control system that can be set in a model 200 single-screw hot melt extrusion granulator can be used. The temperature control system of the present invention is as follows: a condenser is set inside the outer shell of the cavity, one end of the condenser is connected to a water inlet pipe, a valve opening control device is installed on the water inlet pipe, a water outlet pipe is set at the top center of the condenser shell, a thermometer is installed on the inner side wall of the water outlet pipe, the thermometer is connected to the single-chip microcomputer controller through a signal line, and the signal output end of the single-chip microcomputer controller is connected to the valve opening control device.

[0067] Example 1

[0068] The PET resin and the anti-hydrolysis agent powder were uniformly mixed in a weight ratio of 80:20 and then added to a single-screw extruder through a feed port (i.e., the mass percentage of the anti-hydrolysis agent in the "total mass of the polymeric anti-hydrolysis agent and the PET resin" was 20%). The PET powder and the anti-hydrolysis agent powder were softened, mixed, extruded, cooled and granulated by the single-screw extruder. The barrel temperature during the granulation process was 90° C. (i.e., the granulation temperature was 90° C.) to obtain an anti-hydrolysis agent PET masterbatch. Figure 2 This is the color diagram of the hydrolysis-resistant PET masterbatch prepared in Example 1. Figure 2 It can be seen that the hydrolysis-resistant PET masterbatch prepared in Example 1 is white and does not turn yellow, ensuring the original color of the masterbatch.

[0069] The length-to-diameter ratio of the single-screw extruder is 25:1; the rotation speed of the single screw is 30 rpm.

[0070] Example 2

[0071] In Example 2, the mass percentage of the anti-hydrolysis agent in the "total mass of the polymeric anti-hydrolysis agent and the PET resin" is 15%, and other conditions are the same as those in Example 1.

[0072] Example 3

[0073] In Example 2, the mass percentage of the anti-hydrolysis agent in the "total mass of the polymeric anti-hydrolysis agent and the PET resin" is 30%, and other conditions are the same as those in Example 1.

[0074] Example 4

[0075] In Example 4, the granulation temperature was 80° C., and other conditions were the same as in Example 1.

[0076] Example 5

[0077] In Example 5, the granulation temperature was 100° C., and other conditions were the same as those in Example 1.

[0078] Comparative Example 1

[0079] The PET resin and the anti-hydrolysis agent powder were uniformly mixed in a weight ratio of 80:20, melt-kneaded, extruded, cooled and granulated in a twin-screw extruder to obtain the anti-hydrolysis agent PET masterbatch. Figure 3 This is the appearance color diagram of the PET masterbatch prepared in Comparative Example 1. Figure 3 It can be seen that the hydrolysis-resistant PET masterbatch prepared in Comparative Example 1 has turned yellow, and the appearance of the masterbatch is significantly worse than that of Example 1.

[0080] Comparative Example 2

[0081] The PET resin was added into the twin-screw extruder through the main feed port, and was extruded by the twin-screw, cooled and granulated to obtain blank PET particles.

[0082] Comparative Example 3

[0083] The PET resin and the anti-hydrolysis agent powder were uniformly mixed in a weight ratio of 80:20 and then added into a single-screw extruder through a main feeding port. The PET powder and the anti-hydrolysis agent powder were softened, mixed, extruded, cooled and granulated by the single-screw extruder. The barrel temperature during the granulation process was controlled at 200°C to obtain the anti-hydrolysis agent PET masterbatch.

[0084] Effect embodiment

[0085] (1) Intrinsic viscosity test

[0086] In order to compare the reaction degree between PET powder and anti-hydrolysis agent in different preparation processes, the above-mentioned intrinsic viscosity was tested.

[0087] Test objects: hydrolysis-resistant PET masterbatches prepared in Examples 1 to 5 and Comparative Examples 1 to 3.

[0088] Test method and conditions: The test condition is 25°C, and the solvent is phenol and tetrachloromethane (mass ratio 60:40). The intrinsic viscosity test method is GB / T 14190-2008.

[0089] Test results: as shown in Table 1.

[0090] Table 1 Intrinsic viscosity of PET masterbatch prepared under different process conditions

[0091]

[0092] Comparing the intrinsic viscosity of unextruded blank PET particles and PET masterbatches prepared using different processes reveals that twin-screw extruder production leads to an increase in the intrinsic viscosity of the masterbatch, indicating a possible crosslinking issue. The intrinsic viscosity of the masterbatch slightly exceeds that of the blank PET powder when the single-screw pelletizing temperature is relatively high, indicating that high single-screw pelletizing temperatures can also lead to varying degrees of crosslinking. The viscosity of the masterbatch produced in Example 1 of the present invention is slightly lower than that of the blank PET powder because the polymeric anti-hydrolysis agent reacts less strongly with the PET powder and the molecular weight of the anti-hydrolysis agent itself is smaller than that of the PET powder, resulting in a lower overall viscosity of the masterbatch. The viscosity of the blank particles extruded without the anti-hydrolysis agent significantly decreases, indicating severe degradation.

[0093] (2) Tensile strength test

[0094] Test objects: hydrolysis-resistant PET masterbatches prepared in Examples 1 to 5 and Comparative Examples 1 to 3.

[0095] Test method and conditions: The PET masterbatch prepared in Example 1 and Comparative Examples 1 to 3 and the blank particles were blended to prepare PET strips (in the strips, the mass ratio of the anti-hydrolysis agent to the "total mass of the PET masterbatch and the blank PET particles" was 1%). The prepared strips were subjected to PCT aging (conditions, 121°C, saturated vapor pressure), and their tensile strength was tested (test standard: GB / T1040.2-2006).

[0096] Test results: as shown in Table 2.

[0097] Table 2 Aging mechanical properties of PET specimens prepared by PET masterbatch with different processing technologies

[0098] Tensile strength (MPa) Aging 0h Aging 24h Aging 48h Aging 72h Example 1 62 59 45 21 Example 2 63 59 46 23 Example 3 61 59 45 22 Example 4 62 58 43 24 Example 5 62 59 47 23 Comparative Example 1 62 59 30 10 Comparative Example 2 60 58 12 0 Comparative Example 3 61 57 35 16

[0099] Comparing the aging mechanical properties of PET specimens prepared from PET masterbatches using different processing techniques, the PET masterbatch prepared by the present invention has obvious advantages in terms of anti-hydrolysis effect.

[0100] (3) Weight loss rate test

[0101] Test objects: PET masterbatches prepared in Examples 1 to 5 and Comparative Examples 1 to 3.

[0102] Test method and conditions: The PET masterbatch prepared in Examples 1 to 5 and Comparative Examples 1 to 3 was subjected to an extraction experiment, and the extraction solvent was chloroform (the PET masterbatch was crushed with a universal grinder, 20 g of powder was accurately weighed and loaded into the prepared filter paper, and then placed in a Soxhlet extractor, the amount of extraction solvent was 200 mL, and refluxed at 80 ° C for 24 h), and the extracted PET masterbatch was dried to a constant weight in a vacuum oven at 120 ° C. After drying, the weight loss rate was calculated by weighing. The weight loss rate results are shown in Table 3.

[0103] Table 3 Extraction weight loss rate of PET masterbatch prepared under different process conditions

[0104]

[0105]

[0106] Note: Extraction is the process of extracting the unreacted anti-hydrolysis agent by physical means. The more unreacted anti-hydrolysis agent there is, the more it is extracted and the higher the weight loss rate.

[0107] Comparing the extraction weight loss rates of the PET masterbatches prepared in Example 1 and Comparative Examples 1-3, it can be seen that the extraction weight loss rate of the PET masterbatch in Example 1 of the present invention is higher than that of the masterbatch manufactured by the twin-screw high-temperature extruder in Comparative Example 1, and is also higher than that of the masterbatch manufactured by the single-screw high-temperature extruder in Comparative Example 3, indicating that the content of unreacted anti-hydrolysis agent retained in the PET masterbatch manufactured by the present invention is higher.

[0108] The inventors speculate that the high weight loss rate of Example 1 may be due to:

[0109] The masterbatch produced by single-screw granulation has not undergone high-temperature thermal history and strong shearing action of twin-screw extruder, which reduces the degree of degradation of PET substrate and reduces the degree of reaction between anti-hydrolysis agent and PET substrate, resulting in more unreacted anti-hydrolysis agent in the system.

Claims

1. A method for preparing hydrolysis-resistant PET masterbatch, characterized in that: The method comprises the following steps: extruding the raw material of hydrolysis-resistant PET masterbatch through a single-screw extruder, cooling and granulating, thereby obtaining the hydrolysis-resistant PET masterbatch; The raw materials of the anti-hydrolysis PET masterbatch include a polymeric anti-hydrolysis agent and a PET resin; The polymeric anti-hydrolysis agent is purchased from Lanxess Germany Co., Ltd., and the model is Stabaxol® P anti-hydrolysis agent; The granulation temperature is 80-100°C; The addition amount of the polymeric anti-hydrolysis agent is 10% to 50%, where the percentage is the mass percentage of the polymeric anti-hydrolysis agent in the raw material of the anti-hydrolysis PET masterbatch.

2. The method for preparing the hydrolysis-resistant PET masterbatch according to claim 1, wherein The single screw extruder is a 200 type single screw hot melt extrusion granulator.

3. The method for preparing the hydrolysis-resistant PET masterbatch according to claim 1, wherein The single-screw extruder is equipped with an automatic temperature control system.

4. The method for preparing the hydrolysis-resistant PET masterbatch according to claim 3, wherein: When the single-screw extruder is equipped with an automatic temperature control system, the automatic temperature control system is equipped on the cavity shell of the single-screw extruder.

5. The method for preparing the hydrolysis-resistant PET masterbatch according to claim 4, wherein: The automatic temperature control system is configured as follows: A condenser is arranged inside the outer shell of the cavity, one end of the condenser is connected to a water inlet pipe, a valve opening control device is installed on the water inlet pipe, a water outlet pipe is arranged at the top center of the condenser shell, a thermometer is installed on the inner wall of the water outlet pipe, the thermometer is connected to the single-chip microcomputer controller through a signal line, and the signal output end of the single-chip microcomputer controller is connected to the valve opening control device.

6. The method for preparing the hydrolysis-resistant PET masterbatch according to claim 1, wherein: In the horizontal direction, the end of the single screw of the single screw extruder away from the feeding port of the single screw extruder includes a blade connection.

7. The method for preparing the hydrolysis-resistant PET masterbatch according to claim 6, wherein: The number of blades connected at the blade connection is 3.

8. The method for preparing the hydrolysis-resistant PET masterbatch according to claim 6, wherein: The angle between each blade is 120°.

9. The method for preparing the hydrolysis-resistant PET masterbatch according to any one of claims 1 to 8, characterized in that: It satisfies one or more of the following conditions ac; a. The granulation temperature is 90-100°C; b. The aspect ratio of the single screw extruder is (20-30):1; and c. The rotation speed of the single screw extruder is 20-50 rpm.

10. The method for preparing the hydrolysis-resistant PET masterbatch according to any one of claims 1 to 8, characterized in that: It satisfies one or more of the following conditions ac; a. The granulation temperature is 95°C; b. The single screw extruder has an aspect ratio of 25:1; and c. The rotation speed of the single screw extruder is 30 rpm.

11. The method for preparing the hydrolysis-resistant PET masterbatch according to any one of claims 1 to 8, characterized in that: The addition amount of the polymeric anti-hydrolysis agent is 15% to 30%.

12. The method for preparing the hydrolysis-resistant PET masterbatch according to any one of claims 1 to 8, characterized in that: The added amount of the polymeric anti-hydrolysis agent is 20%, 25% or 28%.

13. A hydrolysis-resistant PET masterbatch, characterized in that: The PET masterbatch is prepared by the method for preparing the hydrolysis-resistant PET masterbatch according to any one of claims 1 to 12.

14. Use of the hydrolysis-resistant PET masterbatch according to claim 13 as a raw material in the field of film or fiber spinning.

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