Elastic amorphous PCTG material and preparation method thereof
By introducing isobasic acids and isools into PCTG materials to change molecular regularity, an elastic amorphous PCTG material with good transparency and toughness at high temperatures was prepared, solving the problem that the rigidity of existing materials increases while the elasticity decreases when the TG temperature is increased.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-04-03
AI Technical Summary
When the glass transition temperature (TG) of existing PCTG materials is increased, the rigidity of the material increases while the elasticity decreases, and the transparency and toughness are insufficient.
By introducing isobasic acids (such as adipic acid) and isools (such as 1,4-butanediol, polyethylene glycol, and methoxy polyethylene glycol) into the basic reaction system of PCTG materials, the regularity of the molecules is changed, increasing the toughness and elasticity of the materials. Elastic amorphous PCTG materials are prepared by esterification and polycondensation reactions.
The prepared PCTG material maintains good transparency and toughness at high temperatures, with a TG temperature of 90-105℃, a melting peak of 180-230℃, a tensile strength ≥50MPa, an elastic modulus of 1200-1500MPa, and an elongation at break ≥600%.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of new materials technology, specifically relating to an elastic amorphous PCTG material and its preparation method. Background Technology
[0002] PCTG, short for polyethylene terephthalate-1,4-cyclohexanediethanol ester, is generally produced by transesterification polymerization of three monomers: terephthalic acid (PTA), ethylene glycol (EG), and 1,4-cyclohexanediethanol (CHDM). Compared to PET, it contains the 1,4-cyclohexanediethanol comonomer, and compared to PCT, it contains the ethylene glycol comonomer. Therefore, the properties of PCTG are quite different from those of PET and PCT.
[0003] Currently, PCTG materials prepared from PTA, EG, and CHDM are generally crystalline or semi-crystalline, and are rigid copolyesters. These materials have high hardness at room temperature and are prone to embrittlement and fogging. In contrast, amorphous PCTG materials have a high glass transition temperature (TG), allowing for sterilization; they are also easy to process, have good transparency, and a low melting point, enabling a wider range of processing conditions and reducing the requirements for processing equipment. However, as the TG temperature increases, the rigidity of PCTG materials increases while their elasticity decreases.
[0004] Therefore, there is an urgent need to develop an elastic non-crystalline PCTG material that can improve the TG temperature while ensuring the material's toughness and transparency, and also enhance its processing performance. Summary of the Invention
[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes an elastic amorphous PCTG material and a method for preparing the same, wherein the amorphous PCTG material exhibits good transparency and toughness while increasing the TG temperature.
[0006] The inventive concept of this invention is as follows: This invention uses PTA, EG, and CHDM as the basic reaction system for PCTG materials. By adding CHDM and controlling its amount, the TG and TM (melting point) temperatures of the material are increased, thereby improving the material's high-temperature resistance. However, with the increase of CHDM in the copolymer, the rigidity of the material increases while its toughness decreases. Therefore, this invention introduces isobasic acids (such as adipic acid) and isools (such as 1,4-butanediol, BDO; polyethylene glycol, PEG; methoxy polyethylene glycol, MPEG) different from the basic reaction system to change the regularity of the molecules, thereby improving the elasticity of the material. Specifically, adipic acid and BDO participate in the polymerization reaction, increasing the toughness of the material and improving its tear resistance; PEG and MPEG are added to the reaction system, and through linear intercalation, they help increase the elasticity of the material. During the polymerization process, when the molecular weight increases to a certain extent, the final elasticity target is achieved. At the same time, the combination with the polymer benzene ring of PTA helps improve the chemical resistance of the material.
[0007] To solve the above-mentioned technical problems, the first aspect of the present invention provides an elastic amorphous PCTG material, the raw material components of which include terephthalic acid, ethylene glycol, 1,4-cyclohexanediethanol, isobasic acid and isool; the isobasic acid includes adipic acid, and the isool includes 1,4-butanediol, polyethylene glycol and methoxy polyethylene glycol.
[0008] In some embodiments of the present invention, the polyethylene glycol includes polyethylene glycol 200 and polyethylene glycol 600, namely polyethylene glycol with a number average molecular weight of 200 and polyethylene glycol with a number average molecular weight of 600.
[0009] In some embodiments of the present invention, the mass ratio of polyethylene glycol 200 to polyethylene glycol 600 is (0.2-2.5):1.
[0010] In some embodiments of the present invention, the number average molecular weight of the methoxy polyethylene glycol is 800-1000, preferably 800, i.e., MPEG800.
[0011] In some embodiments of the present invention, the mass ratio of 1,4-butanediol, polyethylene glycol and methoxy polyethylene glycol in the isool is (1-3):(1-6):1.
[0012] In some embodiments of the present invention, the raw material components of the elastic amorphous PCTG material include, by weight: 30-40 parts terephthalic acid, 8-20 parts ethylene glycol, 25-45 parts 1,4-cyclohexanediol, 3.5-10 parts adipic acid, 5-10 parts 1,4-butanediol, 5-20 parts polyethylene glycol, and 3.5-5 parts methoxy polyethylene glycol.
[0013] In some embodiments of the present invention, the raw material components of the elastic amorphous PCTG material include, by weight: 30-40 parts terephthalic acid, 8-20 parts ethylene glycol, 25-45 parts 1,4-cyclohexanediol, 3.5-10 parts adipic acid, 5-10 parts 1,4-butanediol, 3-5 parts polyethylene glycol 200, 2-15 parts polyethylene glycol 600, and 3.5-5 parts methoxy polyethylene glycol 800.
[0014] In some embodiments of the present invention, the raw material components of the elastic amorphous PCTG material further include additives, the additives including at least one of catalysts, stabilizers and end-capping agents, and the catalysts including zinc-titanium composite catalysts and polymerization catalysts.
[0015] In some embodiments of the present invention, the amount of the adjuvant is 0.2-3 parts by weight.
[0016] In some embodiments of the present invention, the mass ratio of catalyst, stabilizer and capping agent in the additive is (0.05-0.2):(0.14-0.5):(0.01-0.1).
[0017] In some embodiments of the present invention, the mass ratio of the zinc-titanium composite catalyst to the polymer catalyst in the additive is (0.5-1.5):1.
[0018] In some embodiments of the present invention, the zinc-titanium composite catalyst is not particularly required, and conventional zinc-titanium catalysts in the art can be selected.
[0019] In some embodiments of the present invention, the polymerization catalyst is not particularly required, and conventional polymerization catalysts in the art can be selected.
[0020] In some embodiments of the present invention, the stabilizer includes disodium hydrogen phosphate.
[0021] In some embodiments of the present invention, the capping agent includes carboxyacrylate capping agents.
[0022] A second aspect of the present invention provides a method for preparing the above-mentioned elastic amorphous PCTG material, comprising the following steps: The raw material components are mixed and subjected to esterification and polycondensation reactions to obtain the amorphous PCTG.
[0023] In some embodiments of the present invention, the method for preparing the elastic amorphous PCTG material includes the following steps: (1) Take phthalic acid, ethylene glycol, 1,4-cyclohexanediol, adipic acid, 1,4-butanediol, polyethylene glycol 200 and zinc-titanium composite catalyst according to the mass ratio, mix them to obtain a mixed slurry; (2) Add the mixed slurry to the esterification kettle, heat it to carry out the esterification reaction, add polyethylene glycol 600, and add stabilizer and end-capping agent at the end of the esterification reaction to obtain the esterification product; (3) The esterification product is added to the polycondensation reactor, a polymerization catalyst and methoxy polyethylene glycol are added, mixed, and heated to carry out the polycondensation reaction to obtain the polycondensation product. After granulation, the elastic amorphous PCTG material is obtained.
[0024] In some embodiments of the present invention, in step (1), the mixing method is to stir at a speed of 30-60 rpm for 40-80 minutes.
[0025] In some embodiments of the present invention, in step (2), the temperature of the esterification reaction is 220-250°C.
[0026] In some embodiments of the present invention, in step (2), the esterification reaction takes 4-6 hours.
[0027] In some embodiments of the present invention, in step (3), the temperature of the polycondensation reaction is 220-280°C.
[0028] In some embodiments of the present invention, in step (3), the vacuum degree during the polycondensation reaction is ≤60 PA.
[0029] Compared with the prior art, the above-described technical solution of the present invention has at least the following technical effects or advantages: (1) This invention uses PTA, EG, and CHDM as the basic reaction system for PCTG materials. By adding CHDM and controlling its dosage, the TG and TM temperatures of the material are increased, thereby improving the high-temperature resistance of the material. At the same time, by introducing isobasic acids (such as adipic acid) and isools (such as BDO, PEG, and MPEG) different from the basic reaction system, the regularity of the molecules is changed, thereby improving the elasticity of the material. Among them, adipic acid and BDO participate in the polymerization reaction, increasing the toughness of the material and improving its tear resistance; PEG and MPEG are added to the reaction system, and through linear intercalation, they improve the elasticity of the material.
[0030] (2) The PCTG material prepared by the present invention is a transparent non-crystalline copolyester with a TG temperature of 90-105℃, a melting peak of 180-230℃, a tensile strength ≥50MPA, an elastic modulus of 1200-1500MPa, and an elongation at break ≥600 parts. Detailed Implementation
[0031] The present invention will now be described in detail with reference to embodiments to facilitate understanding of the invention by those skilled in the art. It is particularly important to note that the embodiments are merely illustrative of the invention and should not be construed as limiting the scope of protection of the invention. Non-essential improvements and adjustments made to the invention by those skilled in the art based on the above description should still fall within the scope of protection of the invention. Furthermore, all raw materials mentioned below, unless otherwise specified, are commercially available products; all process steps or preparation methods not mentioned in detail are process steps or preparation methods known to those skilled in the art.
[0032] Example 1 An elastic amorphous PCTG material, the raw material components of which, by weight, include: 35 parts terephthalic acid, 10 parts ethylene glycol, 30 parts 1,4-cyclohexanediol, 5 parts adipic acid, 8 parts 1,4-butanediol, 4 parts polyethylene glycol 200, 4 parts polyethylene glycol 600, 4 parts methoxy polyethylene glycol 800, and 0.37 parts additives.
[0033] The additives include 0.05 parts of zinc-titanium composite catalyst, 0.05 parts of polymerization catalyst, 0.24 parts of disodium hydrogen phosphate, and 0.03 parts of carboxyacrylate end-capping agent.
[0034] The preparation method of the above-mentioned elastic amorphous PCTG material includes the following steps: (1) Weigh out phthalic acid, ethylene glycol, 1,4-cyclohexanediol, adipic acid, 1,4-butanediol, polyethylene glycol 200 and zinc-titanium composite catalyst according to the mass ratio, add them to the pulping kettle, and stir at 40 rpm for 60 minutes to obtain a mixed slurry; (2) The mixed slurry obtained in step (1) is pumped to the esterification kettle and heated to 240°C for esterification reaction. The by-products are separated by the esterification tower. Then, polyethylene glycol 600 is added. The esterification endpoint is determined by collecting and measuring the amount of by-products. Then, disodium hydrogen phosphate and carboxyacrylate end-capping agent are added at the esterification endpoint to obtain the esterified product. (3) The esterification product obtained in step (2) is transported to a polycondensation reactor, a polymerization catalyst and methoxy polyethylene glycol 800 are added, the mixture is stirred evenly, and the temperature is raised to 250°C. Polycondensation reaction is carried out under a vacuum of ≤60 PA. The by-products of the reaction are removed from the reaction system by vacuuming. The continuous removal of by-products from the reaction system allows the reaction to continue. The reaction endpoint is determined by the frequency and current of the stirring motor, and the polycondensation product is obtained. Finally, the polycondensation product is cast into a strip, cooled, pelletized, dried, and separated to obtain the amorphous PCTG material of this embodiment.
[0035] Example 2 An elastic amorphous PCTG material, the raw material components of which, by weight, include: 38 parts terephthalic acid, 8 parts ethylene glycol, 35 parts 1,4-cyclohexanediol, 4 parts adipic acid, 6 parts 1,4-butanediol, 3 parts polyethylene glycol 200, 2 parts polyethylene glycol 600, 4 parts methoxy polyethylene glycol 800, and 0.55 parts additives.
[0036] The additives include 0.1 parts of zinc-titanium composite catalyst, 0.1 parts of polymerization catalyst, 0.3 parts of disodium hydrogen phosphate, and 0.05 parts of carboxyacrylate end-capping agent.
[0037] The preparation method of the above-mentioned elastic amorphous PCTG material includes the following steps: (1) Weigh out phthalic acid, ethylene glycol, 1,4-cyclohexanediol, adipic acid, 1,4-butanediol, polyethylene glycol 200 and zinc-titanium composite catalyst according to the mass ratio, add them to the pulping kettle, and stir at 30 rpm for 80 minutes to obtain a mixed slurry; (2) The mixed slurry obtained in step (1) is pumped to the esterification kettle and heated to 230°C for esterification reaction. The by-products are separated by the esterification tower. Then, polyethylene glycol 600 is added. The esterification endpoint is determined by collecting and measuring the amount of by-products. Then, disodium hydrogen phosphate and carboxyacrylate end-capping agent are added at the esterification endpoint to obtain the esterified product. (3) The esterification product obtained in step (2) is transported to a polycondensation reactor, a polymerization catalyst and methoxy polyethylene glycol 800 are added, the mixture is stirred evenly, and the temperature is raised to 260°C. Polycondensation reaction is carried out under a vacuum of ≤60 PA. The by-products of the reaction are removed from the reaction system by vacuuming. The continuous removal of by-products from the reaction system allows the reaction to continue. The reaction endpoint is determined by the frequency and current of the stirring motor, and the polycondensation product is obtained. Finally, the polycondensation product is cast into a strip, cooled, pelletized, dried, and separated to obtain the amorphous PCTG material of this embodiment.
[0038] Example 3 An elastic amorphous PCTG material, the raw material components of which, by weight, include: 35 parts terephthalic acid, 10 parts ethylene glycol, 30 parts 1,4-cyclohexanediol, 8 parts adipic acid 5,1,4-butanediol, 4 parts polyethylene glycol 200, 4 parts polyethylene glycol 600, 4 parts methoxy polyethylene glycol 800, and 0.76 parts additives.
[0039] The additives include 0.15 parts of zinc-titanium composite catalyst, 0.15 parts of polymerization catalyst, 0.4 parts of disodium hydrogen phosphate, and 0.06 parts of carboxyacrylate end-capping agent.
[0040] The preparation method of the above-mentioned elastic amorphous PCTG material includes the following steps: (1) Weigh out phthalic acid, ethylene glycol, 1,4-cyclohexanediol, adipic acid, 1,4-butanediol, polyethylene glycol 200 and zinc-titanium composite catalyst according to the mass ratio, add them to the pulping kettle, and stir at 60 rpm for 40 minutes to obtain a mixed slurry; (2) The mixed slurry obtained in step (1) is pumped to the esterification kettle and heated to 250°C for esterification reaction. The by-products are separated by the esterification tower. Then, polyethylene glycol 600 is added. The esterification endpoint is determined by collecting and measuring the amount of by-products. Then, disodium hydrogen phosphate and carboxyacrylate end-capping agent are added at the esterification endpoint to obtain the esterified product. (3) The esterification product obtained in step (2) is transported to a polycondensation reactor, a polymerization catalyst and methoxy polyethylene glycol 800 are added, the mixture is stirred evenly, and the temperature is raised to 230°C. Polycondensation reaction is carried out under a vacuum of ≤60 PA. The by-products of the reaction are removed from the reaction system by vacuuming. The continuous removal of by-products from the reaction system allows the reaction to continue. The reaction endpoint is determined by the frequency and current of the stirring motor, and the polycondensation product is obtained. Finally, the polycondensation product is cast into a strip, cooled, pelletized, dried, and separated to obtain the amorphous PCTG material of this embodiment.
[0041] Comparative Example 1 Compared to Example 1, the raw material composition of the PCTG material in Comparative Example 1 does not contain isobasic acid and isohydric alcohol; its raw material composition by weight includes: 50 parts terephthalic acid, 5 parts ethylene glycol, 45 parts 1,4-cyclohexanediethanol, and 0.37 parts additives.
[0042] The additives include 0.05 parts of zinc-titanium composite catalyst, 0.05 parts of polymerization catalyst, 0.24 parts of disodium hydrogen phosphate, and 0.03 parts of carboxyacrylate end-capping agent.
[0043] The preparation method of the above-mentioned elastic amorphous PCTG material includes the following steps: (1) Weigh phthalic acid, ethylene glycol, 1,4-cyclohexanediethanol and zinc-titanium composite catalyst according to the mass ratio, add them to the slurry kettle, and stir at 40 rpm for 60 minutes to obtain a mixed slurry; (2) The mixed slurry obtained in step (1) is pumped to the esterification kettle and heated to 240°C for esterification reaction. The by-products are separated by the esterification tower. The esterification endpoint is determined by collecting and measuring the amount of by-products. Then, disodium hydrogen phosphate and carboxyacrylate end-capping agent are added at the esterification endpoint to obtain the esterified product. (3) The esterified product obtained in step (2) is transported to a polycondensation reactor, a polymerization catalyst is added and stirred evenly, the temperature is raised to 250°C, and a polycondensation reaction is carried out under a vacuum of ≤60 PA. The by-products of the reaction are removed from the reaction system by vacuuming, and the reaction continues by continuously removing the by-products from the reaction system. The reaction endpoint is determined by the frequency and current of the stirring motor, and the polycondensation product is obtained. Finally, the polycondensation product is cast into a strip, cooled, pelletized, dried and separated to obtain the PCTG material of this comparative example.
[0044] Comparative Example 2 Compared to Example 1, the raw material composition of the PCTG material in Comparative Example 2 does not contain isobasic acid; its raw material composition by weight includes: 33.5 parts terephthalic acid, 8 parts ethylene glycol, 45 parts 1,4-cyclohexanediol, 5 parts 1,4-butanediol, 2 parts polyethylene glycol 200, 3 parts polyethylene glycol 600, 3.5 parts methoxy polyethylene glycol 800, and 0.37 parts additives.
[0045] The additives include 0.05 parts of zinc-titanium composite catalyst, 0.05 parts of polymerization catalyst, 0.24 parts of disodium hydrogen phosphate, and 0.03 parts of carboxyacrylate end-capping agent.
[0046] The preparation method of the above-mentioned elastic amorphous PCTG material includes the following steps: (1) Weigh out phthalic acid, ethylene glycol, 1,4-cyclohexanediethanol, 1,4-butanediol, polyethylene glycol 200 and zinc-titanium composite catalyst according to the mass ratio, add them to the pulping kettle, and stir at 40 rpm for 60 minutes to obtain a mixed slurry; (2) The mixed slurry obtained in step (1) is pumped to the esterification kettle and heated to 240°C for esterification reaction. The by-products are separated by the esterification tower. Then, polyethylene glycol 600 is added. The esterification endpoint is determined by collecting and measuring the amount of by-products. Then, disodium hydrogen phosphate and carboxyacrylate end-capping agent are added at the esterification endpoint to obtain the esterified product. (3) The esterification product obtained in step (2) is transported to a polycondensation reactor, a polymerization catalyst and methoxy polyethylene glycol 800 are added, the mixture is stirred evenly, and the temperature is raised to 250°C. Polycondensation reaction is carried out under a vacuum of ≤60 PA. The by-products of the reaction are removed from the reaction system by vacuuming. The continuous removal of by-products from the reaction system allows the reaction to continue. The reaction endpoint is determined by the frequency and current of the stirring motor, and the polycondensation product is obtained. Finally, the polycondensation product is cast into a strip, cooled, pelletized, dried, and separated to obtain the PCTG material of this comparative example.
[0047] Comparative Example 3 Compared to Example 1, the raw material composition of the PCTG material in Comparative Example 3 does not contain polyethylene glycol and methoxy polyethylene glycol; its raw material composition by weight includes: 40 parts terephthalic acid, 8 parts ethylene glycol, 43.5 parts 1,4-cyclohexanediol, 3.5 parts adipic acid, 5 parts 1,4-butanediol, and 0.37 parts additives.
[0048] The additives include 0.05 parts of zinc-titanium composite catalyst, 0.05 parts of polymerization catalyst, 0.24 parts of disodium hydrogen phosphate, and 0.03 parts of carboxyacrylate end-capping agent.
[0049] The preparation method of the above-mentioned elastic amorphous PCTG material includes the following steps: (1) Weigh out phthalic acid, ethylene glycol, 1,4-cyclohexanediol, adipic acid, 1,4-butanediol and zinc-titanium composite catalyst according to the mass ratio, add them to the pulping kettle, and stir at 40 rpm for 60 minutes to obtain a mixed slurry; (2) The mixed slurry obtained in step (1) is pumped to the esterification kettle and heated to 240°C for esterification reaction. The by-products are separated by the esterification tower. The esterification endpoint is determined by collecting and measuring the amount of by-products. Then, disodium hydrogen phosphate and carboxyacrylate end-capping agent are added at the esterification endpoint to obtain the esterified product. (3) The esterification product obtained in step (2) is transported to a polycondensation reactor, a polymerization catalyst is added, the mixture is stirred evenly, and the temperature is raised to 250°C. The polycondensation reaction is carried out under a vacuum of ≤60 PA. The by-products of the reaction are removed from the reaction system by vacuuming. The continuous removal of by-products from the reaction system allows the reaction to continue. The reaction endpoint is determined by the frequency and current of the stirring motor, and the polycondensation product is obtained. Finally, the polycondensation product is cast into a strip, cooled, pelletized, dried, and separated to obtain the PCTG material of this comparative example.
[0050] Performance testing The PCTG materials prepared in Examples 1-3 and Comparative Examples 1-3 were tested for TG temperature, melting peak temperature, and mechanical strength, and the transparency of the materials was observed. Specifically, TG temperature and melting peak temperature were tested using the DSC method; tensile strength was tested according to standard ISO 527-2; elastic modulus was tested according to standard ISO 178; and elongation at break was tested according to standard ISO 527-2. The results are shown in Table 1.
[0051] Table 1:
[0052] As shown in Table 1, the PCTG materials prepared in Examples 1-3 all exhibit high TG temperatures and good transparency and toughness. However, the PCTG materials in Comparative Examples 1-3, compared to the PCTG material in Example 1, cannot simultaneously possess good transparency and toughness due to the absence of isobasic acids and isools in their raw material components, as well as the absence of polyethylene glycol and methoxy polyethylene glycol.
[0053] For those skilled in the art, several simple deductions or substitutions can be made without departing from the inventive concept, without requiring creative effort. Therefore, any simple improvements made to this invention by those skilled in the art based on the disclosure of this invention should be within the scope of protection of this invention. The above embodiments are preferred embodiments of this invention, and all processes similar to this invention and equivalent changes should fall within the scope of protection of this invention.
Claims
1. An elastic amorphous PCTG material, characterized in that, Its raw material components include terephthalic acid, ethylene glycol, 1,4-cyclohexanediethanol, isobasic acid and isohydrin; the isobasic acid includes adipic acid, and the isohydrin includes 1,4-butanediol, polyethylene glycol and methoxy polyethylene glycol.
2. The elastic amorphous PCTG material according to claim 1, characterized in that, The polyethylene glycol includes polyethylene glycol 200 and polyethylene glycol 600, and the mass ratio of polyethylene glycol 200 to polyethylene glycol 600 is (0.2-2.5):
1.
3. The elastic amorphous PCTG material according to claim 1, characterized in that, The number-average molecular weight of the methoxy polyethylene glycol is 800-1000.
4. The elastic amorphous PCTG material according to claim 1, characterized in that, In the isool, the mass ratio of 1,4-butanediol, polyethylene glycol, and methoxy polyethylene glycol is (1-3):(1-6):
1.
5. The elastic amorphous PCTG material according to any one of claims 1-4, characterized in that, Its raw material components, by weight, include: 30-40 parts terephthalic acid, 8-20 parts ethylene glycol, 25-45 parts 1,4-cyclohexanediol, 3.5-10 parts adipic acid, 5-10 parts 1,4-butanediol, 5-20 parts polyethylene glycol, and 3.5-5 parts methoxy polyethylene glycol.
6. The elastic amorphous PCTG material according to claim 5, characterized in that, Its raw material components also include additives, which include at least one of catalysts, stabilizers and end-capping agents, and the catalysts include zinc-titanium composite catalysts and polymerization catalysts.
7. A method for preparing an elastic amorphous PCTG material as described in any one of claims 1-6, characterized in that, Includes the following steps: The raw material components are mixed and subjected to esterification and polycondensation reactions to obtain the amorphous PCTG material.
8. The method for preparing the elastic amorphous PCTG material according to claim 7, characterized in that, Includes the following steps: (1) Take terephthalic acid, ethylene glycol, 1,4-cyclohexanediol, adipic acid, 1,4-butanediol, polyethylene glycol 200 and zinc-titanium composite catalyst according to the mass ratio, mix them to obtain a mixed slurry; (2) Place the mixed slurry in an esterification kettle, heat it to carry out the esterification reaction, add polyethylene glycol 600, and add a stabilizer and a capping agent at the end of the esterification reaction to obtain the esterification product; (3) The esterification product is added to the polycondensation reactor, a polymerization catalyst and methoxy polyethylene glycol are added, mixed, and heated to carry out the polycondensation reaction to obtain the polycondensation product. After granulation, the elastic amorphous PCTG material is obtained.
9. The method for preparing the elastic amorphous PCTG material according to claim 8, characterized in that, In step (2), the temperature of the esterification reaction is 220-250°C; and / or the time of the esterification reaction is 4-6 hours.
10. The method for preparing the elastic amorphous PCTG material according to claim 8, characterized in that, In step (3), the temperature of the polycondensation reaction is 220-280℃; and / or, the vacuum degree during the polycondensation reaction is ≤60PA.