Preparation system for PETG shrink film functional master batch

Abstract

The utility model discloses a preparation system for PETG shrink film functional master batch, which comprises at least one esterification tank and a polycondensation tank, the esterification tank is provided with a first inlet for terephthalic acid, a second inlet for ethylene glycol and a third inlet for being connected with an outlet of an esterification auxiliary material tank; the polycondensation tank is provided with a fourth inlet used for being connected with an outlet of the esterification tank, a fifth inlet used for being connected with an outlet of a polycondensation auxiliary material tank and a sixth inlet used for potassium tripolyphosphate; 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 dryer. The shrink film prepared from the functional master batch prepared by the preparation system disclosed by the utility model has relatively excellent shrinkage performance, relatively low shrinkage temperature, stable shrinkage force and excellent transverse thermal shrinkage rate.

Description

Technical Field

[0001] The utility model relates to a preparation system for a functional masterbatch of a PETG shrink film. Background Art

[0002] CN 113696572 B discloses a composite PETG heat shrinkable film and its preparation system. The composite PETG heat shrinkable film is composed of an extruded A-layer surface layer, a B-layer core layer and a C-layer bottom layer. The A-layer and the C-layer are respectively arranged on both sides of the B-layer, wherein: the A-layer and the C-layer both include PETG and 5.5wt% to 9.5wt% of the total mass of PETG functional material slices, wherein the PETG functional material slices include 80-95 weight parts of PETG slices, 2-5 weight parts of nano boron nitride, 1-2 weight parts of aluminate, 6-10 weight parts of polydimethylsiloxane and 2-3 weight parts of potassium chloride. The B-layer includes PS and 14.5wt% to 21.5wt% of the total mass of PS functional material slices. The prior art adjusts the functions of the PETG layer and the PS layer by adding a functional masterbatch, so that the die head temperature during co-extrusion after adjustment can be reduced to about 240°C, and the interface corrugation defect can be effectively eliminated and the film layer separation can be avoided. The composite PETG heat shrinkable film of the prior art has the advantages of both PETG and PS. The outer layer is PETG, which is easy to print and has low temperature sensitivity; the inner layer is PS, so the shrinkage force is also reduced, which is convenient for shrinkage.

[0003] The PETG slices used in the PETG functional material of the prior art can be partially or entirely from purchased or pre-prepared raw materials, so the performance of the prepared PETG functional material is limited by the purchased PETG slices or the PETG slices with fixed raw materials. Generally speaking, PETG is generally considered to be a copolymer product obtained by replacing part of the ethylene glycol with 1,4-cyclohexanedimethanol (CHDM) during the synthesis of polyethylene terephthalate (PET), wherein the different addition amounts of CHDM determine the crystallinity of the prepared PETG. However, the crystallinity of PET is very high, and only after the CHDM modification and the crystallinity is reduced can relatively good shrinkage performance be obtained. Therefore, in the case where the shrinkage of the shrinkage film is determined by the non-crystalline region of the material, the shrinkage of PETG obtained by copolymerization of different raw materials is also very different. Therefore, the above-mentioned prior art uses PETG slices composed of specific raw materials, and the shrinkage performance of the functional material prepared by it is relatively difficult to be significantly adjusted by the subsequent addition of other material components. For example, the prior art adds nano boron nitride, aluminate, polydimethylsiloxane and potassium chloride to PETG slices, and its main adjustment target is to reduce the die head temperature during co-extrusion, but relatively speaking, it reduces the shrinkage rate and shrinkage force. Although the reduction is not large, it can still be seen that the adjustment range of the functional masterbatch on the shrinkage performance is limited. Of course, the applicant cannot determine which material component has a greater impact on the shrinkage performance of the shrinkage film. Therefore, under the market demand for flexible production of shrinkage films with different shrinkage performances, it is expected to prepare a functional masterbatch with relatively wider adaptability. Through the combination of the functional masterbatch and various additives or film layers, the shrinkage performance can be adjusted relatively more to obtain shrinkage films suitable for different application scenarios. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a preparation system for a functional masterbatch of a PETG shrink film, so as to reduce or avoid the above-mentioned problems.

[0005] To solve the above technical problems, the present application proposes a preparation system for PETG shrink film functional masterbatch, comprising at least one esterification tank and a polycondensation tank, wherein the esterification tank has a first inlet for terephthalic acid, a second inlet for ethylene glycol, and a third inlet for connecting the outlet of an esterification auxiliary material tank; the polycondensation tank has a fourth inlet for connecting the outlet of the esterification tank, a fifth inlet for connecting the outlet of a polycondensation auxiliary material tank, and a sixth inlet for potassium tripolyphosphate; 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 dryer.

[0006] Preferably, the esterification auxiliary material tank is provided with three inlets corresponding to the input of 1,4-cyclohexanedimethanol, triaryl phosphate and isocyanate respectively.

[0007] Preferably, the polycondensation auxiliary material tank is provided with three inlets corresponding to the input of magnesium aluminum silicate, disodium ethylenediaminetetraacetate and other auxiliary agents respectively.

[0008] The shrinkage film prepared with the functional masterbatch obtained by the preparation system of the present application has relatively excellent shrinkage performance, a low shrinkage temperature, a stable shrinkage force and an excellent transverse heat shrinkage rate. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0010] Figure 1 Shown is a schematic structural diagram of a system for preparing a functional masterbatch of PETG shrink film according to a specific embodiment of the present application. DETAILED DESCRIPTION

[0011] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation methods of the present application are now described in detail.

[0012] As described in the background technology, the present application hopes to propose a functional masterbatch whose shrinkage performance can be adjusted to a greater extent, and thus the applicant proposes the following idea, that is, to prepare a functional masterbatch with relatively high shrinkage performance, and when it is needed to be applied to certain scenes with relatively low parameter requirements, the shrinkage parameters can be reduced by adding other ingredients or compounding film layers of other materials. For example, generally speaking, the preparation difficulty of shrinkage films with low shrinkage temperature, relatively high shrinkage rate and shrinkage force is relatively high, while the opposite parameter indicators are relatively easy to obtain, which means that by adding some additives or compounding other film layers, it is relatively easy to weaken these parameter indicators, and thus the adaptability of this functional masterbatch will become wider, that is, it is relatively easy to adjust the shrinkage performance of shrinkage films in various application scenarios.

[0013] In view of this, the present application proposes a functional masterbatch for PETG shrink film, which is prepared from the following raw materials in parts by weight: 100-120 parts by weight of terephthalic acid, 30-50 parts by weight of 1,4-cyclohexanedimethanol, 80-100 parts by weight of ethylene glycol, 0.1-0.2 parts by weight of triaryl phosphate, 0.01-0.03 parts by weight of isocyanate, 0.01-0.02 parts by weight of potassium tripolyphosphate, 0.1-0.2 parts by weight of magnesium aluminum silicate, 0.2-0.4 parts by weight of disodium ethylenediaminetetraacetate, and 0.3-0.5 parts by weight of other additives.

[0014] Among them, other additives include but are not limited to anti-adhesive agents, antioxidants, stabilizers, leveling agents, flame retardants, etc., or a combination thereof.

[0015] Refer to the following Figure 1 The structural schematic diagram of the preparation system for the functional masterbatch of PETG shrink film of the present application shows a detailed description of the production method of the functional masterbatch of the present application.

[0016] As shown in the figure, the preparation system for PETG shrink film functional masterbatch of the present application includes at least one esterification tank 100 and a polycondensation tank 200. Those skilled in the art should understand that the preparation system of the present application is not limited to only one esterification tank and one polycondensation tank. For example, for different production scales, two or more esterification tanks 100 and two or more polycondensation tanks 200 can be connected in series in sequence, wherein the front esterification tank 100 and polycondensation tank 200 are used for pre-reaction, and the last esterification tank 100 and polycondensation tank 200 are used for final reaction.

[0017] The esterification tank 100 has a first inlet 101 for terephthalic acid, a second inlet 102 for ethylene glycol, and a third inlet 103 for connecting to the outlet of the esterification auxiliary material tank 300 .

[0018] The esterification auxiliary material tank 300 is provided with three inlets for inputting 1,4-cyclohexanedimethanol, triaryl phosphate and isocyanate respectively. Initially, terephthalic acid and ethylene glycol can be added for pre-reaction, and then the three auxiliary materials mixed in the esterification auxiliary material tank 300 are added to the esterification tank 100.

[0019] The polycondensation tank 200 has a fourth inlet 204 for connecting to the outlet of the esterification tank 100 , a fifth inlet 205 for connecting to the outlet of the polycondensation auxiliary material tank 500 , and a sixth inlet 206 for potassium tripolyphosphate.

[0020] The polycondensation auxiliary material tank 500 is provided with three inlets for respectively inputting magnesium aluminum silicate, disodium ethylenediaminetetraacetate and other auxiliary agents. Initially, potassium tripolyphosphate can be added for pre-reaction, and then the three auxiliary materials mixed in the polycondensation auxiliary material tank 500 are added to the polycondensation tank 200.

[0021] 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 800 is connected to a dryer 800 .

[0022] Refer to the following Figure 1 The method for preparing the functional masterbatch of the present application is described in detail.

[0023] For example, 100-120 parts by weight of terephthalic acid and 80-100 parts by weight of ethylene glycol may be added into the esterification tank 100 through the first inlet 101 and the second inlet 102, respectively, and mixed uniformly at room temperature to perform a pre-reaction for 30-60 minutes.

[0024] 30-50 parts by weight of 1,4-cyclohexanedimethanol, 0.1-0.2 parts by weight of triaryl phosphate, and 0.01-0.03 parts by weight of isocyanate are added to the esterification auxiliary material tank 300 and mixed evenly, and then the three mixed esterification auxiliary materials are added to the esterification tank 100 through the third inlet 103. The reaction conditions of the esterification tank 100 are set to 230-250° C. and 0.2-0.3 MPa, and the esterification reaction is carried out. After the water output reaches the theoretical value, the system pressure is released to normal pressure.

[0025] Then, the esterification product is filtered through the outlet of the esterification tank 100 and transferred to the polycondensation tank 200 through the fourth inlet 204. At the same time, 0.01-0.02 parts by weight of potassium tripolyphosphate is added to the polycondensation tank 200 through the sixth inlet 206. The temperature is maintained at 230-250° C. and stirred at normal pressure for 10 minutes. Then, vacuum is drawn, the temperature in the polycondensation tank 200 is raised to 285° C., the pressure is reduced to below 100 Pa, the reaction is carried out for more than 3 hours, the intrinsic viscosity reaches more than 0.80 dl / g, the temperature is reduced to 230° C., and the pressure is restored to normal pressure.

[0026] 0.1-0.2 parts by weight of aluminum magnesium silicate, 0.2-0.4 parts by weight of disodium ethylenediaminetetraacetate, and 0.3-0.5 parts by weight of other additives are added to the polycondensation auxiliary material tank 500 and mixed evenly, and then the mixed three polycondensation auxiliary materials are added to the polycondensation tank 200 through the fifth inlet 205.

[0027] The temperature in the polycondensation tank 200 is maintained at 230° C. and stirred for 30 minutes. Finally, the polymer melt is filtered and transported from the outlet of the polycondensation tank 200 to the extruder 600 for extrusion, and then pelletized by a pelletizer 700, and finally dried by a dryer 800 to obtain a PETG shrink film functional masterbatch.

[0028] The functional masterbatch and shrink film of the following examples and comparative examples were prepared using the conditions of the above preparation method. The process parameters of the above preparation method are not repeated in the examples and comparative examples, and only the addition amount of various reaction components is described in detail.

[0029] Example 1

[0030] 100 parts by weight of terephthalic acid, 80 parts by weight of ethylene glycol, 30 parts by weight of 1,4-cyclohexanedimethanol, 0.1 parts by weight of triaryl phosphate, and 0.01 parts by weight of isocyanate were added into an esterification tank to carry out an esterification reaction.

[0031] The esterification product is transferred to a polycondensation tank, and 0.01 parts by weight of potassium tripolyphosphate, 0.1 parts by weight of magnesium aluminum silicate, 0.2 parts by weight of disodium ethylenediaminetetraacetate, and 0.3 parts by weight of nano calcium carbonate anti-adhesive are added to the polycondensation tank to carry out a polycondensation reaction.

[0032] In this embodiment, the intrinsic viscosity of the polycondensation reaction product can reach a maximum of 0.80 dl / g.

[0033] Finally, the polymer melt is extruded, pelletized and dried to obtain a PETG shrink film functional masterbatch.

[0034] The prepared PETG shrink film functional masterbatch is melt-extruded, die-cast, transversely far-infrared stretched, cooled and shaped, rolled up, and slit to form a single-layer shrink film; the maximum shrinkage temperature of the film is 81°C, the transverse heat shrinkage rate is 71% in 2 to 3 seconds, the light transmittance is 95%, and the shrinkage force is 6.1N / m 2 , thickness is 50μm.

[0035] Example 2

[0036] 110 parts by weight of terephthalic acid, 90 parts by weight of ethylene glycol, 40 parts by weight of 1,4-cyclohexanedimethanol, 0.15 parts by weight of triaryl phosphate, and 0.02 parts by weight of isocyanate were added into an esterification tank to carry out an esterification reaction.

[0037] The esterification product was transferred to a polycondensation tank, and 0.015 parts by weight of potassium tripolyphosphate, 0.15 parts by weight of magnesium aluminum silicate, 0.3 parts by weight of disodium ethylenediaminetetraacetate, and 0.4 parts by weight of polytetrahydrofuran leveling agent were added to the polycondensation tank to carry out a polycondensation reaction.

[0038] In this embodiment, the maximum intrinsic viscosity of the polycondensation reaction product can reach 0.81 dl / g.

[0039] Finally, the polymer melt is extruded, pelletized and dried to obtain a PETG shrink film functional masterbatch.

[0040] The prepared PETG shrink film functional masterbatch is melt-extruded, die-cast, transversely far-infrared stretched, cooled and shaped, rolled up, and slit to form a single-layer shrink film; the maximum shrinkage temperature of the film is 80°C, the transverse heat shrinkage rate is 73% in 2 to 3 seconds, the light transmittance is 94%, and the shrinkage force is 6.0N / m 2 , thickness is 50μm.

[0041] Example 3

[0042] 120 parts by weight of terephthalic acid, 100 parts by weight of ethylene glycol, 50 parts by weight of 1,4-cyclohexanedimethanol, 0.2 parts by weight of triaryl phosphate, and 0.03 parts by weight of isocyanate were added into an esterification tank to carry out an esterification reaction.

[0043] The esterification product is transferred to a polycondensation tank, and 0.02 parts by weight of potassium tripolyphosphate, 0.2 parts by weight of magnesium aluminum silicate, 0.4 parts by weight of disodium ethylenediaminetetraacetate, 0.3 parts by weight of nano titanium dioxide stabilizer, and 0.2 parts by weight of decabromodiphenyl ether flame retardant are added to the polycondensation tank to carry out a polycondensation reaction.

[0044] In this embodiment, the intrinsic viscosity of the polycondensation reaction product can reach a maximum of 0.82 dl / g.

[0045] Finally, the polymer melt is extruded, pelletized and dried to obtain a PETG shrink film functional masterbatch.

[0046] The prepared PETG shrink film functional masterbatch is melt-extruded, die-cast, transversely far-infrared stretched, cooled and shaped, rolled up, and slit to form a single-layer shrink film; the maximum shrinkage temperature of the film is 80°C, the transverse heat shrinkage rate is 72% in 2 to 3 seconds, the light transmittance is 93%, and the shrinkage force is 6.2N / m 2 , thickness is 50μm.

[0047] Based on the limitation of the existing PETG shrink film being the PETG slices with fixed raw materials, this application proposes a new preparation process and a combination of specific raw materials based on the raw materials. By adding different raw material ratios in the esterification and polycondensation stages, the shrinkage performance of the prepared PETG can be improved. The following is a comparison of the performance of the prepared shrink film using different preparation processes and raw material ratios.

[0048] Comparative Example 1

[0049] 100 parts by weight of terephthalic acid, 80 parts by weight of ethylene glycol, and 30 parts by weight of 1,4-cyclohexanedimethanol were added into an esterification tank to carry out an esterification reaction.

[0050] The esterification product is transferred to a polycondensation tank, and 0.3 parts by weight of a nano calcium carbonate anti-adhesive agent is added to the polycondensation tank to carry out a polycondensation reaction. Finally, the polymer melt is extruded, pelletized, and dried to obtain a PETG shrink film functional masterbatch.

[0051] In this comparative example, the maximum intrinsic viscosity of the polycondensation reaction product can reach 0.69 dl / g.

[0052] The prepared PETG shrink film functional masterbatch is melt-extruded, die-cast, transversely far-infrared stretched, cooled and shaped, rolled up, and slit to form a single-layer shrink film; the maximum shrinkage temperature of the film is 120°C, the transverse heat shrinkage rate is 67% in 2 to 3 seconds, the light transmittance is 85%, and the shrinkage force is 6.9N / m 2 , thickness is 50μm.

[0053] Comparative Example 2

[0054] 110 parts by weight of terephthalic acid, 90 parts by weight of ethylene glycol, 40 parts by weight of 1,4-cyclohexanedimethanol, 0.15 parts by weight of triaryl phosphate, and 0.02 parts by weight of isocyanate were added into an esterification tank to carry out an esterification reaction.

[0055] The esterification product is transferred to a polycondensation tank, and 0.4 parts by weight of polytetrahydrofuran leveling agent is added to the polycondensation tank to carry out a polycondensation reaction. Finally, the polymer melt is extruded, pelletized, and dried to obtain a PETG shrink film functional masterbatch.

[0056] In this comparative example, the maximum intrinsic viscosity of the polycondensation reaction product can reach 0.71 dl / g.

[0057] The prepared PETG shrink film functional masterbatch is melt-extruded, die-cast, transversely far-infrared stretched, cooled and shaped, rolled up, and slit to form a single-layer shrink film; the maximum shrinkage temperature of the film is 115°C, the transverse heat shrinkage rate is 73% in 2 to 3 seconds, the light transmittance is 88%, and the shrinkage force is 6.7N / m 2 , thickness is 50μm.

[0058] Comparative Example 3

[0059] 120 parts by weight of terephthalic acid, 100 parts by weight of ethylene glycol, 50 parts by weight of 1,4-cyclohexanedimethanol, 0.2 parts by weight of triaryl phosphate, and 0.03 parts by weight of isocyanate were added into an esterification tank to carry out an esterification reaction.

[0060] The esterification product is transferred to a polycondensation tank, and 0.3 parts by weight of a nano titanium dioxide stabilizer is added to the polycondensation tank to carry out a polycondensation reaction. Finally, the polymer melt is extruded, pelletized, and dried to obtain a PETG shrink film functional masterbatch.

[0061] In this comparative example, the maximum intrinsic viscosity of the polycondensation reaction product can reach 0.80 dl / g.

[0062] The prepared PETG shrink film functional masterbatch is melt-extruded, die-cast, transversely far-infrared stretched, cooled and shaped, rolled up, and slit to form a single-layer shrink film; the maximum shrinkage temperature of the film is 120°C, the transverse heat shrinkage rate is 68% in 2 to 3 seconds, the light transmittance is 89%, and the shrinkage force is 3.8N / m 2 , thickness is 50μm.

[0063] Comparative Example 4

[0064] 100 parts by weight of terephthalic acid, 80 parts by weight of ethylene glycol, 30 parts by weight of 1,4-cyclohexanedimethanol and 0.1 parts by weight of triaryl phosphate were added into an esterification tank to carry out an esterification reaction.

[0065] The esterification product is transferred to a polycondensation tank, and 0.01 parts by weight of potassium tripolyphosphate, 0.1 parts by weight of magnesium aluminum silicate, and 0.3 parts by weight of nano calcium carbonate anti-adhesive agent are added to the polycondensation tank to carry out a polycondensation reaction. Finally, the polymer melt is extruded, pelletized, and dried to obtain a PETG shrink film functional masterbatch.

[0066] In this comparative example, the intrinsic viscosity of the polycondensation reaction product can reach a maximum of 0.75 dl / g.

[0067] The prepared PETG shrink film functional masterbatch is melt-extruded, die-cast, transversely far-infrared stretched, cooled and shaped, rolled up, and slit to form a single-layer shrink film; the maximum shrinkage temperature of the film is 120°C, the transverse heat shrinkage rate is 75% in 2 to 3 seconds, the light transmittance is 92%, and the shrinkage force is 3.2N / m 2 , thickness is 50μm.

[0068] Comparative Example 5

[0069] 110 parts by weight of terephthalic acid, 90 parts by weight of ethylene glycol, 40 parts by weight of 1,4-cyclohexanedimethanol and 0.02 parts by weight of isocyanate were added into an esterification tank to carry out an esterification reaction.

[0070] The esterification product is transferred to a polycondensation tank, and 0.015 parts by weight of potassium tripolyphosphate, 0.15 parts by weight of magnesium aluminum silicate, 0.3 parts by weight of disodium ethylenediaminetetraacetate, and 0.4 parts by weight of polytetrahydrofuran leveling agent are added to the polycondensation tank to carry out a polycondensation reaction. Finally, the polymer melt is extruded, pelletized, and dried to obtain a PETG shrink film functional masterbatch.

[0071] In this comparative example, the maximum intrinsic viscosity of the polycondensation reaction product can reach 0.73 dl / g.

[0072] The prepared PETG shrink film functional masterbatch is melt-extruded, die-cast, transversely far-infrared stretched, cooled and shaped, rolled up, and slit to form a single-layer shrink film; the maximum shrinkage temperature of the film is 108°C, the transverse heat shrinkage rate is 76% in 2 to 3 seconds, the light transmittance is 90%, and the shrinkage force is 4.1N / m 2 , thickness is 50μm.

[0073] Comparative Example 6

[0074] 120 parts by weight of terephthalic acid, 100 parts by weight of ethylene glycol, 50 parts by weight of 1,4-cyclohexanedimethanol, 0.2 parts by weight of triaryl phosphate, and 0.03 parts by weight of isocyanate were added into an esterification tank to carry out an esterification reaction.

[0075] The esterification product is transferred to a polycondensation tank, and 0.02 parts by weight of potassium tripolyphosphate, 0.4 parts by weight of disodium ethylenediaminetetraacetate, 0.3 parts by weight of nano titanium dioxide stabilizer, and 0.2 parts by weight of decabromodiphenyl ether flame retardant are added to the polycondensation tank to carry out a polycondensation reaction. Finally, the polymer melt is extruded, pelletized, and dried to obtain a PETG shrink film functional masterbatch.

[0076] In this comparative example, the maximum intrinsic viscosity of the polycondensation reaction product can reach 0.80 dl / g.

[0077] The prepared PETG shrink film functional masterbatch is melt-extruded, die-cast, transversely far-infrared stretched, cooled and shaped, rolled up, and slit to form a single-layer shrink film; the maximum shrinkage temperature of the film is 109°C, the transverse heat shrinkage rate is 75% in 2 to 3 seconds, the light transmittance is 84%, and the shrinkage force is 3.9N / m 2 , thickness is 50μm.

[0078] By comparing the above embodiments and comparative examples, it can be seen that the shrinkage film prepared by the functional masterbatch obtained by the method of the present application has relatively excellent shrinkage performance, a low shrinkage temperature, a stable shrinkage force and an excellent transverse heat shrinkage rate.

[0079] Those skilled in the art should understand that although the present application is described in the form of multiple embodiments, not every embodiment contains only one independent technical solution. Such description in the specification is only for the sake of clarity, and those skilled in the art should understand the specification as a whole and regard the technical solutions involved in each embodiment as being able to be combined into different embodiments to understand the scope of protection of the present application.

[0080] The above description is only an illustrative embodiment of the present application and is not intended to limit the scope of the present application. Any equivalent changes, modifications and combinations made by any technician in the field without departing from the concept and principle of the present application shall fall within the scope of protection of the present application.

Claims

1. A system for preparing a functional masterbatch of a PETG shrink film, comprising at least one esterification tank (100) and a polycondensation tank (200), characterized in that: The esterification tank (100) has a first inlet (101) for terephthalic acid, a second inlet (102) for ethylene glycol, and a third inlet (103) for connecting to the outlet of an esterification auxiliary material tank (300); the polycondensation tank (200) has a fourth inlet (204) for connecting to the outlet of the esterification tank (100), a fifth inlet (205) for connecting to the outlet of a polycondensation auxiliary material tank (500), and a sixth inlet (206) for potassium tripolyphosphate; 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 dryer (800).

2. The preparation system according to claim 1, characterized in that: The esterification auxiliary material tank (300) is provided with three inlets for respectively inputting 1,4-cyclohexanedimethanol, triaryl phosphate and isocyanate.

3. The preparation system according to claim 1, characterized in that: The polycondensation auxiliary material tank (500) is provided with three inlets corresponding to the input of magnesium aluminum silicate, disodium ethylenediaminetetraacetate and other auxiliary agents.

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