Antibacterial and heat-resistant polyesters, their preparation methods and applications

Abstract

This invention relates to the field of polymer materials and discloses an antibacterial and heat-resistant polyester, its preparation method and application. The polyester includes repeating units as shown in the following formula: where x, y, z and q are non-zero natural numbers, and w is a natural number from 15 to 50. The antibacterial and heat-resistant polyester provided by this invention has uniform antibacterial sites, stable and long-lasting antibacterial performance, and also has excellent and controllable heat resistance, mechanical properties and barrier properties.

Description

Technical Field

[0001] This invention relates to the field of polymer materials, specifically to an antibacterial and heat-resistant polyester, its preparation method, and its application. Background Technology

[0002] Traditional PCTG copolyester possesses excellent properties such as being BPA-free, having good processability and molding properties, and good chemical resistance, making it widely used in the construction, medical, and industrial fields, gradually replacing traditional materials such as PVC and PC. Common forms of PCTG include sheets, pipes, rods, and films. It exhibits excellent durability and impact resistance, making it suitable for high-intensity environments, such as architectural decorative panels, including walls, ceilings, and partitions. High-transparency PCTG sheets can be used to make roofs and skylights, increasing indoor lighting. Furthermore, PCTG has a high fire resistance rating, reaching B1, and is widely used in commercial and residential buildings. In recent years, the antibacterial properties of PCTG have become increasingly sought after by users. Antibacterial and heat-resistant PCTG has superior antibacterial properties compared to traditional PCTG products, and can be used in profiles, medical devices, bottled water containers, and small household appliances, expanding its application range. Most existing antibacterial and heat-resistant materials are produced by screw melt blending and extrusion granulation of antibacterial agents and materials. Some processes also modify the heat-resistant materials. However, regardless of whether the heat-resistant materials are modified, the antibacterial PCTG obtained by melt blending still suffers from uneven mixing, resulting in poor antibacterial effect. In addition, this process requires secondary processing, which leads to high production costs.

[0003] CN114773640A discloses a method for preparing a helical carbon nanotube / zinc oxide / PCTG masterbatch and a PCTG composite material containing the masterbatch. The masterbatch is a PCTG material loaded with helical carbon nanotubes and zinc oxide. The content of helical carbon nanotubes in the PCTG masterbatch is 0.01-10 wt%, and the content of zinc oxide is 0.01-20 wt%. Although the PCTG material prepared using this technology has antibacterial properties, the structure of helical carbon nanotubes and zinc oxide is destroyed during the blending process, making it difficult for the zinc oxide, which plays an antibacterial role, to be uniformly dispersed in the PCTG matrix. This results in low material compatibility, and the antibacterial properties after processing are insufficient to meet the antibacterial requirements of the material. Furthermore, it is difficult to guarantee the long-term antibacterial effect of zinc oxide during use. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem of poor antibacterial performance of existing antibacterial materials and to provide an antibacterial heat-resistant polyester, its preparation method, and its applications. The antibacterial heat-resistant polyester provided by this invention has uniform antibacterial sites, with silver ions as the antibacterial center. After coordination with polyethylene glycol, the silver ions are not only uniformly distributed in the polyester but also prevented from being reduced to elemental silver, making the polyester's antibacterial performance more stable and durable. In addition to antibacterial properties, this polyester also possesses excellent and controllable heat resistance, mechanical properties, and barrier properties.

[0005] To achieve the above objectives, the present invention provides an antibacterial and heat-resistant polyester, wherein the polyester comprises repeating units as shown in the following formula:

[0006] Where x, y, z, and q are non-zero natural numbers, and w is a natural number between 15 and 50.

[0007] A second aspect of this invention provides a method for preparing an antibacterial and heat-resistant polyester, the method comprising: mixing polyethylene glycol containing silver ions, 1,4-cyclohexanediol, isosorbide, ethylene glycol, terephthalic acid, a catalyst, optionally an antioxidant, and optionally a colorant, followed by an esterification reaction and a polycondensation reaction; wherein the polyethylene glycol containing silver ions has the following structural formula: , where w is a natural number between 15 and 50.

[0008] A third aspect of the present invention provides an antibacterial and heat-resistant polyester prepared by the preparation method described herein.

[0009] The fourth aspect of this invention provides the application of the antibacterial and heat-resistant polyester described herein in the fields of profiles, medical devices, and home appliances.

[0010] This invention uniformly loads silver ions into a polymer through coordination, resulting in an antibacterial and heat-resistant polyester with uniform antibacterial sites, stable and long-lasting antibacterial properties, and excellent and controllable heat resistance, mechanical properties, and barrier properties. The polyester contains controllable proportions of poly(1,4-cyclohexanediol) terephthalate (PCT) segments, polyisosorbate terephthalate (PIT) segments, polyethylene terephthalate (PET) segments, and silver ion-loaded polyethylene glycol (PEG) segments. The introduction of PEG adds controllable proportions and adjustable segment lengths of aliphatic polyether segments to the original aromatic polyester segments, giving the polyester the characteristics of both aromatic polyesters and aliphatic polyethers, greatly expanding the application areas of this type of polyester material. Attached Figure Description

[0011] Figure 1 This is a schematic diagram illustrating the reaction principle of the antibacterial and heat-resistant polyester provided by the present invention. Detailed Implementation

[0012] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0013] This invention provides an antibacterial and heat-resistant polyester, the polyester comprising repeating units as shown in the following formula:

[0014] Where x, y, z, and q are non-zero natural numbers, and w is a natural number between 15 and 50.

[0015] In this invention, the molar ratio of x, y, z, and q in the repeating unit of the polyester can be selected within a wide range. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the molar ratio of x, y, z, and q in the repeating unit of the polyester is 3~7:1~4:2~8:0.01~0.5, preferably 4~6:1~2:3~4:0.16~0.3.

[0016] In this invention, the degree of polymerization w of polyethylene glycol in the repeating unit of the polyester can be selected from a wide range. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the degree of polymerization w of polyethylene glycol in the repeating unit of the polyester is a natural number from 20 to 40, preferably a natural number from 25 to 30.

[0017] In this invention, in the repeating unit of the polyester, The silver ion content in the chain segment can be selected within a wide range. The following is an illustrative example, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, in the repeating unit of the polyester The silver ion content in the chain segment is 2×10 -6 ~8×10 -6 wt%, preferably 3.2×10 -6 ~5×10 -6 wt%.

[0018] The antibacterial and heat-resistant polyester provided by this invention has uniform antibacterial sites, stable and long-lasting antibacterial properties, and excellent and controllable heat resistance, mechanical properties and barrier properties.

[0019] According to a preferred embodiment of the present invention, the glass transition temperature of the polyester is 95~110 °C.

[0020] According to a preferred embodiment of the present invention, the polyester has an antibacterial rate of 92-99.9% against Escherichia coli.

[0021] According to a preferred embodiment of the present invention, the polyester has an antibacterial rate of 93-99.9% against Staphylococcus aureus.

[0022] According to a preferred embodiment of the present invention, the longitudinal tensile strength of the polyester is 189~205 MPa.

[0023] According to a preferred embodiment of the present invention, the transverse tensile strength of the polyester is 192~215 MPa.

[0024] According to a preferred embodiment of the present invention, the longitudinal elongation at break of the polyester is 105-118%.

[0025] According to a preferred embodiment of the present invention, the transverse elongation at break of the polyester is 103-122%.

[0026] According to a preferred embodiment of the present invention, the water vapor transmission rate of the polyester is 1.23~1.40 g / (m²). 2 •24h).

[0027] According to a preferred embodiment of the present invention, the oxygen permeability of the polyester is 23.5~25.0 cm. 3 / (cm 2 ·24h·0.1MPa).

[0028] The antibacterial and heat-resistant polyester provided by this invention contains poly(1,4-cyclohexanediol) terephthalate (PCT) segments, polyisosorbate terephthalate (PIT) segments, polyethylene terephthalate (PET) segments, and silver-ion-loaded polyethylene glycol (PEG) segments in a controllable proportion. The introduction of PEG adds aliphatic polyether segments with controllable proportions and adjustable segment lengths to the original aromatic polyester segments, making the polyester possess the characteristics of both aromatic polyesters and aliphatic polyethers.

[0029] Antibacterial and heat-resistant polyesters possessing the aforementioned characteristics can all achieve the objectives of this invention. There are no special requirements for their preparation methods. The following is an illustrative description, but it does not limit the scope of this invention. According to a preferred embodiment of this invention, the preparation method of the antibacterial and heat-resistant polyester includes: mixing polyethylene glycol containing silver ions, 1,4-cyclohexanediol, isosorbide, ethylene glycol, terephthalic acid, a catalyst, optionally an antioxidant, and optionally a colorant, followed by esterification and polycondensation reactions; the polyethylene glycol containing silver ions has the following structural formula: , where w is a natural number between 15 and 50.

[0030] It should be noted that in this invention, the polyethylene glycol containing silver ions can be prepared in advance, and there are no special requirements for its preparation method. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the preparation method of the polyethylene glycol containing silver ions includes: mixing a silver ion solution with polyethylene glycol, wherein the degree of polymerization w of the polyethylene glycol is a natural number of 15 to 50.

[0031] In this invention, there are no special requirements for the type of silver ion solution. Commonly used silver ion solutions can achieve the purpose of this invention. The following is an illustrative description, but it does not limit the scope of this invention. According to a preferred embodiment of this invention, the silver ion solution is one or more of silver nitrate solution and silver acetate solution, preferably silver nitrate solution.

[0032] In this invention, the concentration of silver ions in the silver ion solution can be selected within a wide range. The following is an illustrative example, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the concentration of silver ions in the silver ion solution is 0.1~0.2 mg / mL. For example, the concentration of silver ions in the silver ion solution can be 0.1 mg / mL, 0.12 mg / mL, 0.14 mg / mL, 0.16 mg / mL, 0.18 mg / mL, or 0.2 mg / mL. In this invention, a silver nitrate standard solution with a silver ion concentration of 0.1 mg / mL (density 1.1 g / cm³) is used. 3 (This serves as an example.)

[0033] In this invention, the mass ratio of silver ion solution to polyethylene glycol can be selected within a wide range. The following is an illustrative description, but it does not limit the scope of this invention. According to a preferred embodiment of this invention, the mass ratio of silver ion solution to polyethylene glycol is 1:25~50, preferably 1:25~28.

[0034] In this invention, the degree of polymerization w of polyethylene glycol can be selected from a wide range. The following is an illustrative description, but it does not limit the scope of this invention. According to a preferred embodiment of this invention, the degree of polymerization w of the polyethylene glycol is a natural number from 20 to 40, preferably a natural number from 25 to 30.

[0035] In this invention, there are no special requirements for the reaction atmosphere during the preparation of polyethylene glycol containing silver ions. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the preparation of polyethylene glycol containing silver ions can be carried out in an inert gas atmosphere. The inert gas has no special requirements and can be, for example, nitrogen, argon, etc.

[0036] According to a preferred embodiment of the present invention, the preparation of polyethylene glycol containing silver ions can be carried out under dynamic conditions. For example, the silver ion solution can be mixed with polyethylene glycol under stirring conditions. There are no special requirements for the stirring speed, which can be selected according to actual needs, and will not be elaborated here.

[0037] In this invention, the mixing temperature can be selected within a wide range during the preparation of polyethylene glycol containing silver ions. The following is an illustrative description, but it does not limit the scope of this invention. According to a preferred embodiment of this invention, the mixing temperature is 60~120 ℃, preferably 80~100 ℃.

[0038] In this invention, the mixing time can be selected within a wide range during the preparation of polyethylene glycol containing silver ions. The following is an illustrative description, but it does not limit the scope of this invention. According to a preferred embodiment of this invention, the mixing time is 1.5 to 3.5 h, preferably 2 to 3 h.

[0039] In this invention, silver ions are uniformly loaded into the polyester through coordination, resulting in more stable and longer-lasting antibacterial performance compared to blending antibacterial agents.

[0040] In this invention, the molar ratio of silver-ion-containing polyethylene glycol, 1,4-cyclohexanediol, isosorbide, and ethylene glycol in the esterification reaction can be selected within a wide range. The following is an illustrative description, but it does not limit the scope of this invention. According to a preferred embodiment of this invention, the molar ratio of silver-ion-containing polyethylene glycol, 1,4-cyclohexanediol, isosorbide, and ethylene glycol is 0.01~0.5:3~7:1.5~4:3.5~8.5, preferably 0.16~0.3:4~6:1~2:5~8.

[0041] In this invention, the molar ratio of 1,4-cyclohexanediethanol to terephthalic acid in the esterification reaction can be selected within a wide range. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the molar ratio of 1,4-cyclohexanediethanol to terephthalic acid is 0.1 to 1:1, preferably 0.4 to 0.6:1.

[0042] In this invention, the alternation degree w of polyethylene glycol in the silver ion-containing polyethylene glycol has a wide selectable range. The following is an illustrative description, but it does not limit the scope of this invention. According to a preferred embodiment of this invention, the alternation degree w of polyethylene glycol in the silver ion-containing polyethylene glycol is a natural number of 15 to 50, preferably a natural number of 20 to 40, and more preferably a natural number of 25 to 30.

[0043] In this invention, the silver ion content in the silver-containing polyethylene glycol has a wide selectable range. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the silver ion content in the silver-containing polyethylene glycol is 2 × 10⁻⁶. -6 ~8×10 -6 wt%, preferably 3.2×10 -6 ~5×10 -6 wt%.

[0044] In this invention, there are no special requirements for the amount of catalyst used in the esterification reaction. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the amount of catalyst used is 300 to 800 ppm of the mass of terephthalic acid, preferably 410 to 520 ppm.

[0045] In this invention, the range of catalysts that can be selected in the esterification reaction is relatively wide. The following is an illustrative description, but it does not limit the scope of this invention. According to a preferred embodiment of this invention, the catalyst is one or more of germanium-containing compounds, titanium-containing compounds, and cobalt-containing catalysts. Preferably, it is one or more of germanium dioxide, tetrabutyl titanate, and cobalt acetate. More preferably, it is one or more of a mixture of germanium-containing compounds and cobalt-containing compounds, or a mixture of germanium-containing compounds and titanium-containing compounds. More preferably, it is a mixture of germanium dioxide and cobalt acetate, or a mixture of germanium dioxide and tetrabutyl titanate.

[0046] In this invention, there are no special requirements for the amount of antioxidant used in the esterification reaction. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the amount of antioxidant used is 500 to 1000 ppm of the mass of terephthalic acid, preferably 500 to 700 ppm.

[0047] In this invention, there are no special requirements for the type of antioxidant in the esterification reaction. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the antioxidant is one or more of antioxidant 1010, antioxidant 1076, and antioxidant 168, preferably antioxidant 1010.

[0048] In this invention, there are no special requirements for the amount of colorant used in the esterification reaction. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the amount of colorant used is 200 to 3000 ppm of the mass of terephthalic acid, preferably 1100 to 1500 ppm.

[0049] In this invention, there are no special requirements for the type of colorant in the esterification reaction. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the colorant is one or more of color oil and color powder, preferably color oil.

[0050] In this invention, there are no special requirements for the reaction atmosphere of the esterification reaction. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the esterification reaction can be carried out in an inert gas atmosphere. The inert gas has no special requirements and can be, for example, nitrogen, argon, etc.

[0051] In the esterification reaction of the present invention, there are no special requirements for the reaction temperature. The following is an illustrative description, but it does not limit the scope of the present invention. According to a preferred embodiment of the present invention, the temperature of the esterification reaction is 150~260 ℃, preferably 180~220 ℃.

[0052] In the esterification reaction of the present invention, there are no special requirements for the reaction pressure. The following is an illustrative description, but it does not limit the scope of the present invention. According to a preferred embodiment of the present invention, the pressure of the esterification reaction is 0.1~0.5 MPa, preferably 0.1~0.3 MPa.

[0053] In the esterification reaction of the present invention, there is no special requirement for the reaction time. The following is an illustrative description, but it does not limit the scope of the present invention. According to a preferred embodiment of the present invention, the esterification reaction time is 1 to 5 hours, preferably 2 to 3 hours.

[0054] In this invention, the reaction conditions for the polycondensation reaction are not particularly required. According to a preferred embodiment of the invention, the polycondensation reaction includes a low-vacuum polycondensation reaction and a high-vacuum polycondensation reaction carried out sequentially. The temperature of the low-vacuum polycondensation reaction is lower than that of the high-vacuum polycondensation reaction, and the pressure of the low-vacuum polycondensation reaction is higher than that of the high-vacuum polycondensation reaction. The polycondensation reaction employing the aforementioned two steps has advantages.

[0055] According to a preferred embodiment of the present invention, the temperature of the low-vacuum polycondensation reaction is 10-50 °C lower than that of the high-vacuum polycondensation reaction, and the pressure of the low-vacuum polycondensation reaction is 10-190 Pa higher than that of the high-vacuum polycondensation reaction. The preferred conditions for the polycondensation reaction employing the aforementioned two steps have advantages.

[0056] In this invention, there are no special requirements for the temperature of the low-vacuum polycondensation reaction. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the temperature of the low-vacuum polycondensation reaction is 250~270°C.

[0057] In this invention, there are no special requirements for the pressure of the low-vacuum polycondensation reaction. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the pressure of the low-vacuum polycondensation reaction is 90~200 Pa.

[0058] In this invention, there are no special requirements for the time of the low-vacuum polycondensation reaction. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the time of the low-vacuum polycondensation reaction is 0.5 to 4 hours.

[0059] In this invention, there are no special requirements for the temperature of the high-vacuum polycondensation reaction. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the temperature of the high-vacuum polycondensation reaction is 280~300°C.

[0060] In this invention, there are no special requirements for the pressure of the high-vacuum polycondensation reaction. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the pressure of the high-vacuum polycondensation reaction is 10~80 Pa.

[0061] In this invention, there are no special requirements for the time of the high-vacuum polycondensation reaction. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the time of the high-vacuum polycondensation reaction is 2 to 4 hours.

[0062] According to a preferred embodiment of the present invention, the preparation method of the antibacterial heat-resistant polyester further includes: keeping warm for 1-2 hours before the start of the esterification reaction.

[0063] In this invention, there are no special requirements for the equipment used in the esterification and polycondensation reactions; they can be selected according to actual needs, such as using a reaction vessel. This invention has no special requirements for the reaction vessel; any reaction vessel capable of achieving the purpose of this invention can be used, and selection can be made according to actual needs, which will not be elaborated here.

[0064] This invention provides an antibacterial and heat-resistant polyester prepared by the method described herein. The antibacterial and heat-resistant polyester provided by this invention exhibits uniform antibacterial sites, stable and long-lasting antibacterial properties, and also possesses excellent and controllable heat resistance, mechanical properties, and barrier properties.

[0065] According to a preferred embodiment of the present invention, the glass transition temperature of the polyester is 95~110 °C.

[0066] According to a preferred embodiment of the present invention, the polyester has an antibacterial rate of 92-99.9% against Escherichia coli.

[0067] According to a preferred embodiment of the present invention, the polyester has an antibacterial rate of 93-99.9% against Staphylococcus aureus.

[0068] According to a preferred embodiment of the present invention, the longitudinal tensile strength of the polyester is 189~205 MPa.

[0069] According to a preferred embodiment of the present invention, the transverse tensile strength of the polyester is 192~215 MPa.

[0070] According to a preferred embodiment of the present invention, the longitudinal elongation at break of the polyester is 105-118%.

[0071] According to a preferred embodiment of the present invention, the transverse elongation at break of the polyester is 103-122%.

[0072] According to a preferred embodiment of the present invention, the water vapor transmission rate of the polyester is 1.23~1.40 g / (m²). 2 •24h).

[0073] According to a preferred embodiment of the present invention, the oxygen permeability of the polyester is 23.5~25.0 cm. 3 / (cm 2 ·24h·0.1MPa).

[0074] This invention provides the application of the antibacterial and heat-resistant polyester described herein in the fields of profiles, medical devices, and home appliances.

[0075] This invention uniformly loads silver ions into a polymer through coordination, resulting in an antibacterial and heat-resistant polyester with uniform antibacterial sites, stable and long-lasting antibacterial performance, and excellent and controllable thermal, mechanical, and barrier properties. The polyester contains controllable proportions of poly(1,4-cyclohexanediol) terephthalate (PCT), polyisosorbate (PIT), polyethylene terephthalate (PET), and silver-loaded polyethylene glycol (PEG) segments. The introduction of PEG adds controllable proportions and adjustable segment lengths of aliphatic polyether segments to the original aromatic polyester segments, giving the polyester the characteristics of both aromatic polyesters and aliphatic polyethers, greatly expanding the application areas of this type of polyester material.

[0076] In this invention, the test standard for the glass transition temperature of the antibacterial and heat-resistant polyester is GB / T 19466.2-2004; the test standard for intrinsic viscosity is GB / T24148.4-2009; the test standards for tensile strength and elongation at break are GB / T1040.1-2018; the test standards for water vapor transmission rate and oxygen transmission rate are GB / T1038.1-2022; and the test standards for antibacterial rate against Escherichia coli and antibacterial rate against Staphylococcus aureus are GB / T20944.

[0077] Example 1 like Figure 1 As shown, the preparation process of antibacterial heat-resistant polyester is as follows: Under nitrogen protection, a standard silver nitrate solution (0.1 mg / mL) and polyethylene glycol (degree of polymerization w = 25) were mixed at a mass ratio of 1:25 until homogeneous. The mixture was stirred at 80 °C for 2 h and then cooled to room temperature for later use. Purified terephthalic acid (1500 g), germanium dioxide (0.6 g), antioxidant 1010 (0.9 g), and colorant oil (2 g) were added to a 5 L stainless steel reactor. Silver-loaded polyethylene glycol (50 g), 1,4-cyclohexanediol (716 g), isosorbide (264 g), and ethylene glycol (364 g) were mixed until homogeneous and added to the reactor at a uniform rate over 3 h. After the addition was complete, the reactor was kept at an inert gas level for 2 h.

[0078] The reactor temperature was adjusted and set to 200 ℃, and the reaction pressure to 0.26 MPa (gauge pressure). The reaction was maintained at this temperature and pressure for 2.5 h, at which point the esterification reaction was complete. During the polycondensation stage, the low-vacuum stage had a polycondensation temperature of 250 ℃, a reaction pressure of -0.1 MPa (gauge pressure), and a reaction time of 0.5 h. The high-vacuum stage had a polycondensation temperature of 280 ℃, a reaction system vacuum of 80 Pa, and a reaction time of 2 h, yielding an antibacterial and heat-resistant polyester.

[0079] The glass transition temperature of the obtained antibacterial and heat-resistant polyester T g Temperature: 103.6℃; Intrinsic viscosity: 0.65 dL / g; Antibacterial rate against Escherichia coli: 92.3%; Antibacterial rate against Staphylococcus aureus: 93.4%; Tensile strength: 201 MPa longitudinally, 211 MPa transversely; Elongation at break: 105% longitudinally, 103% transversely; Water vapor transmission rate: 1.23 g / (m²) 2 • 24h), oxygen permeability 23.789cm 3 / (cm 2 (24h, 0.1MPa). Some data are summarized in Table 1.

[0080] Example 2 Under nitrogen protection, a standard silver nitrate solution (0.1 mg / mL) and polyethylene glycol (degree of polymerization w = 25) were mixed at a mass ratio of 1:25 until homogeneous. The mixture was stirred at 80 °C for 2 h and then cooled to room temperature for later use. Purified terephthalic acid (1500 g), germanium dioxide (0.5 g), tetrabutyl titanate (0.15 g), antioxidant 1010 (0.9 g), and colorant oil (2 g) were added to a 5 L stainless steel reactor. Silver-loaded polyethylene glycol (250 g), 1,4-cyclohexanediol (716 g), isosorbide (264 g), and ethylene glycol (364 g) were mixed until homogeneous and added to the reactor at a uniform rate over 3 h. After the addition was complete, the reactor was kept at an inert gas level for 2 h.

[0081] The reactor temperature was adjusted and set to 200 ℃, and the reaction pressure to 0.26 MPa (gauge pressure). The reaction was maintained at this temperature and pressure for 2.5 h, at which point the esterification reaction was complete. During the polycondensation stage, the low-vacuum stage had a polycondensation temperature of 250 ℃, a reaction pressure of -0.1 MPa (gauge pressure), and a reaction time of 0.5 h. The high-vacuum stage had a polycondensation temperature of 280 ℃, a reaction system vacuum of 80 Pa, and a reaction time of 2 h, yielding an antibacterial and heat-resistant polyester.

[0082] The obtained antibacterial and heat-resistant polyester chips have a glass transition temperature (Tg) of 97.07℃; an intrinsic viscosity of 0.66 dL / g; an antibacterial rate of 98.2% against *Escherichia coli*; an antibacterial rate of 98.6% against *Staphylococcus aureus*; a tensile strength of 197 MPa in the longitudinal direction and 209 MPa in the transverse direction; an elongation at break of 109% in the longitudinal direction and 112% in the transverse direction; and a water vapor transmission rate of 1.36 g / (m²). 2 • 24h), oxygen permeability 24.669cm 3 / (cm 2 (24h, 0.1MPa). Some data are summarized in Table 1.

[0083] Example 3 Under nitrogen protection, a standard silver nitrate solution (0.1 mg / mL) and polyethylene glycol (degree of polymerization w = 25) were mixed at a mass ratio of 1:25 and stirred at 80 °C for 2 h, then cooled to room temperature for later use. Purified terephthalic acid (1500 g), germanium dioxide (0.5 g), cobalt acetate (0.2 g), antioxidant 1010 (0.9 g), and colorant oil (2 g) were added to a 5 L stainless steel reactor. Silver-loaded polyethylene glycol (300 g), 1,4-cyclohexanediol (716 g), isosorbide (264 g), and ethylene glycol (364 g) were mixed thoroughly and added to the reactor at a uniform rate over 3 h. After addition, the reaction was maintained at this temperature for 2 h under inert gas protection.

[0084] The reactor temperature was adjusted and set to 200 ℃, and the reaction pressure to 0.26 MPa (gauge pressure). The reaction was maintained at this temperature and pressure for 2.5 h, at which point the esterification reaction was complete. During the polycondensation stage, the low-vacuum stage had a polycondensation temperature of 250 ℃, a reaction pressure of -0.1 MPa (gauge pressure), and a reaction time of 0.5 h. The high-vacuum stage had a polycondensation temperature of 280 ℃, a reaction system vacuum of 80 Pa, and a reaction time of 2 h, yielding an antibacterial and heat-resistant polyester.

[0085] The obtained antibacterial and heat-resistant polyester chips have a glass transition temperature (Tg) of 95.07℃; an intrinsic viscosity of 0.63 dL / g; an antibacterial rate of 99.2% against *Escherichia coli*; an antibacterial rate of 99.6% against *Staphylococcus aureus*; a tensile strength of 192 MPa in the longitudinal direction and 202 MPa in the transverse direction; an elongation at break of 115% in the longitudinal direction and 120% in the transverse direction; and a water vapor transmission rate of 1.35 g / (m²). 2 • 24h), oxygen permeability 24.229cm 3 / (cm 2 (24h, 0.1MPa). Some data are summarized in Table 1.

[0086] Example 4 Under nitrogen protection, a standard silver nitrate solution (0.1 mg / mL) and polyethylene glycol (degree of polymerization w = 25) were mixed at a mass ratio of 1:30 and stirred at 80 °C for 2 h, then cooled to room temperature for later use. Purified terephthalic acid (1500 g), germanium dioxide (0.6 g), antioxidant 1010 (0.9 g), and colorant oil (2 g) were added to a 5 L stainless steel reactor. Silver-loaded polyethylene glycol (150 g), 1,4-cyclohexanediol (456 g), isosorbide (528 g), and ethylene glycol (364 g) were mixed thoroughly and added to the reactor at a uniform rate over 3 h. After addition, the reactor was kept at this temperature for 2 h under inert gas protection.

[0087] The reactor temperature was adjusted and set to 200 ℃, and the reaction pressure to 0.26 MPa (gauge pressure). The reaction was maintained at this temperature and pressure for 2.5 h, at which point the esterification reaction was complete. During the polycondensation stage, the low-vacuum stage had a polycondensation reaction temperature of 250 ℃, a reaction pressure of -0.1 MPa (gauge pressure), and a reaction time of 0.5 h. The high-vacuum stage had a polycondensation reaction temperature of 280 ℃, a reaction system vacuum of 80 Pa, and a reaction time of 3 h, yielding an antibacterial and heat-resistant polyester.

[0088] The obtained antibacterial and heat-resistant polyester chips have a glass transition temperature (Tg) of 107.4℃; an intrinsic viscosity of 0.65 dL / g; an antibacterial rate of 97.8% against *Escherichia coli*; an antibacterial rate of 98.1% against *Staphylococcus aureus*; tensile strength of 192 MPa in the longitudinal direction and 198 MPa in the transverse direction; elongation at break of 111% in the longitudinal direction and 114% in the transverse direction; and a water vapor transmission rate of 1.38 g / (m²). 2 • 24h), oxygen permeability 24.352cm 3 / (cm 2 (24h, 0.1MPa). Some data are summarized in Table 1.

[0089] Example 5 Under nitrogen protection, a standard silver nitrate solution (0.1 mg / mL) and polyethylene glycol (degree of polymerization w = 25) were mixed at a mass ratio of 1:40 and stirred at 80 °C for 2 h, then cooled to room temperature for later use. Purified terephthalic acid (1500 g), germanium dioxide (0.6 g), antioxidant 1010 (0.9 g), and colorant oil (2 g) were added to a 5 L stainless steel reactor. Silver-loaded polyethylene glycol (150 g), 1,4-cyclohexanediol (456 g), isosorbide (528 g), and ethylene glycol (364 g) were mixed thoroughly and added to the reactor at a uniform rate over 3 h. After addition, the reaction was maintained at this temperature for 2 h under inert gas protection.

[0090] The reactor temperature was adjusted and set to 200 ℃, and the reaction pressure to 0.26 MPa (gauge pressure). The reaction was maintained at this temperature and pressure for 2.5 h, at which point the esterification reaction was complete. During the polycondensation stage, the low-vacuum stage had a polycondensation reaction temperature of 250 ℃, a reaction pressure of -0.1 MPa (gauge pressure), and a reaction time of 0.5 h. The high-vacuum stage had a polycondensation reaction temperature of 280 ℃, a reaction system vacuum of 80 Pa, and a reaction time of 3 h, yielding an antibacterial and heat-resistant polyester.

[0091] The obtained antibacterial and heat-resistant polyester chips have a glass transition temperature (Tg) of 103.4℃; an intrinsic viscosity of 0.63 dL / g; an antibacterial rate of 97.1% against *Escherichia coli*; an antibacterial rate of 97.3% against *Staphylococcus aureus*; tensile strength of 189 MPa in the longitudinal direction and 192 MPa in the transverse direction; elongation at break of 114% in the longitudinal direction and 119% in the transverse direction; and a water vapor transmission rate of 1.38 g / (m²). 2 • 24h), oxygen permeability 24.784cm 3 / (cm 2 (24h, 0.1MPa). Some data are summarized in Table 1.

[0092] Example 6 Under nitrogen protection, a standard silver nitrate solution (0.1 mg / mL) and polyethylene glycol (degree of polymerization w = 25) were mixed at a mass ratio of 1:25 and stirred at 80 °C for 2 h, then cooled to room temperature for later use. Purified terephthalic acid (1500 g), germanium dioxide (0.5 g), cobalt acetate (0.2 g), antioxidant 1010 (0.9 g), and colorant oil (2 g) were added to a 5 L stainless steel reactor. Silver-loaded polyethylene glycol (200 g), 1,4-cyclohexanediol (716 g), isosorbide (264 g), and ethylene glycol (364 g) were mixed thoroughly and added to the reactor at a uniform rate over 3 h. After addition, the reaction was maintained at this temperature for 2 h under inert gas protection.

[0093] The reactor temperature was adjusted and set to 200 ℃, and the reaction pressure to 0.26 MPa (gauge pressure). The reaction was maintained at this temperature and pressure for 2.5 h, at which point the esterification reaction was complete. During the polycondensation stage, the low-vacuum stage had a polycondensation temperature of 250 ℃, a reaction pressure of -0.1 MPa (gauge pressure), and a reaction time of 0.5 h. The high-vacuum stage had a polycondensation temperature of 280 ℃, a reaction system vacuum of 80 Pa, and a reaction time of 2 h, yielding an antibacterial and heat-resistant polyester.

[0094] The obtained antibacterial and heat-resistant polyester chips have a glass transition temperature (Tg) of 96.58℃; an intrinsic viscosity of 0.65 dL / g; an antibacterial rate of 98.7% against *Escherichia coli*; an antibacterial rate of 98.9% against *Staphylococcus aureus*; a tensile strength of 195 MPa in the longitudinal direction and 206 MPa in the transverse direction; an elongation at break of 112% in the longitudinal direction and 117% in the transverse direction; and a water vapor transmission rate of 1.35 g / (m²). 2 • 24h), oxygen permeability 24.437cm 3 / (cm 2 (24h, 0.1MPa). Some data are summarized in Table 1.

[0095] Example 7 Under nitrogen protection, a standard silver nitrate solution (0.1 mg / mL) and polyethylene glycol (degree of polymerization w = 25) were mixed at a mass ratio of 1:40 and stirred at 80 °C for 2 h, then cooled to room temperature for later use. Purified terephthalic acid (1500 g), germanium dioxide (0.5 g), cobalt acetate (0.2 g), antioxidant 1010 (0.9 g), and colorant oil (2 g) were added to a 5 L stainless steel reactor. Silver-loaded polyethylene glycol (300 g), 1,4-cyclohexanediol (716 g), isosorbide (264 g), and ethylene glycol (364 g) were mixed thoroughly and added to the reactor at a uniform rate over 3 h. After addition, the reaction was maintained at this temperature for 2 h under inert gas protection.

[0096] The reactor temperature was adjusted and set to 200 ℃, and the reaction pressure to 0.26 MPa (gauge pressure). The reaction was maintained at this temperature and pressure for 2.5 h, at which point the esterification reaction was complete. During the polycondensation stage, the low-vacuum stage had a polycondensation temperature of 250 ℃, a reaction pressure of -0.1 MPa (gauge pressure), and a reaction time of 0.5 h. The high-vacuum stage had a polycondensation temperature of 280 ℃, a reaction system vacuum of 80 Pa, and a reaction time of 2 h, yielding an antibacterial and heat-resistant polyester.

[0097] The obtained antibacterial and heat-resistant polyester chips have a glass transition temperature (Tg) of 95.12℃; an intrinsic viscosity of 0.64 dL / g; an antibacterial rate of 97.8% against *Escherichia coli* and 97.8% against *Staphylococcus aureus*; tensile strength of 190 MPa in the longitudinal direction and 197 MPa in the transverse direction; elongation at break of 117% in the longitudinal direction and 119% in the transverse direction; and a water vapor transmission rate of 1.39 g / (m²). 2 • 24h), oxygen permeability 25.186cm 3 / (cm 2 (24h, 0.1MPa). Some data are summarized in Table 1.

[0098] Example 8 Under nitrogen protection, a standard silver nitrate solution (0.1 mg / mL) and polyethylene glycol (degree of polymerization w = 25) were mixed at a mass ratio of 1:40 and stirred at 80 °C for 2 h, then cooled to room temperature for later use. Purified terephthalic acid (1500 g), germanium dioxide (0.6 g), antioxidant 1010 (0.9 g), and colorant oil (2 g) were added to a 5 L stainless steel reactor. Silver-loaded polyethylene glycol (200 g), 1,4-cyclohexanediol (456 g), isosorbide (528 g), and ethylene glycol (364 g) were mixed thoroughly and added to the reactor at a uniform rate over 3 h. After the addition was complete, the reactor was kept at an inert gas level for 2 h.

[0099] The reactor temperature was adjusted and set to 200 ℃, and the reaction pressure to 0.26 MPa (gauge pressure). The reaction was maintained at this temperature and pressure for 2.5 h, at which point the esterification reaction was complete. During the polycondensation stage, the low-vacuum stage had a polycondensation reaction temperature of 250 ℃, a reaction pressure of -0.1 MPa (gauge pressure), and a reaction time of 0.5 h. The high-vacuum stage had a polycondensation reaction temperature of 280 ℃, a reaction system vacuum of 80 Pa, and a reaction time of 3 h, yielding an antibacterial and heat-resistant polyester.

[0100] The obtained antibacterial and heat-resistant polyester chips have a glass transition temperature (Tg) of 96.98℃; an intrinsic viscosity of 0.63 dL / g; an antibacterial rate of 97.6% against *Escherichia coli*; an antibacterial rate of 97.5% against *Staphylococcus aureus*; a tensile strength of 190 MPa in the longitudinal direction and 195 MPa in the transverse direction; an elongation at break of 112% in the longitudinal direction and 118% in the transverse direction; and a water vapor transmission rate of 1.37 g / (m²). 2 • 24h), oxygen permeability 24.799cm 3 / (cm 2 (24h, 0.1MPa). Some data are summarized in Table 1.

[0101] Comparative Example 1 Add purified terephthalic acid (1500 g), germanium dioxide (0.6 g), antioxidant 1010 (0.9 g), and colorant oil (2 g) to a 5 L stainless steel reactor. Add polyethylene glycol (degree of polymerization w = 25, 50 g), 1,4-cyclohexanediethanol (716 g), isosorbide (264 g), and ethylene glycol (364 g) to the reactor. Mix well and add the mixture to the reactor at a uniform rate over 3 h. After the addition is complete, keep the reactor at a constant temperature for 2 h under inert gas protection.

[0102] The reactor temperature was adjusted and set to 200 ℃, and the reaction pressure to 0.26 MPa (gauge pressure). The reaction was maintained at this temperature and pressure for 2.5 h, at which point the esterification reaction was complete. During the polycondensation stage, the low-vacuum stage had a polycondensation reaction temperature of 250 ℃, a reaction pressure of -0.1 MPa (gauge pressure), and a reaction time of 0.5 h. The high-vacuum stage had a polycondensation reaction temperature of 280 ℃, a reaction system vacuum of 80 Pa, and a reaction time of 2 h, yielding polyester chips.

[0103] The obtained slices had a glass transition temperature (Tg) of 95.32℃; intrinsic viscosity of 0.64 dL / g; antibacterial rate against *Escherichia coli* of 0.2%; antibacterial rate against *Staphylococcus aureus* of 0.6%; tensile strength of 195 MPa longitudinally and 197 MPa transversely; elongation at break of 112% longitudinally and 115% transversely; and water vapor transmission rate of 1.25 g / (m²). 2 • 24h), oxygen permeability 24.986cm 3 / (cm 2 (24h, 0.1MPa). Some data are summarized in Table 1.

[0104] Comparative Example 2 Add purified terephthalic acid (1500 g), germanium dioxide (0.6 g), antioxidant 1010 (0.9 g), and colorant oil (2 g) to a 5 L stainless steel reactor. Add silver nitrate standard solution (0.1 mg / mL, 5.7 g), 1,4-cyclohexanediethanol (716 g), isosorbide (264 g), and ethylene glycol (364 g) to the reactor and mix well. Add the mixture to the reactor at a constant rate over 3 h. After the addition is complete, keep the reactor at a constant temperature for 2 h under inert gas protection.

[0105] The reactor temperature was adjusted and set to 200 ℃, and the reaction pressure to 0.26 MPa (gauge pressure). The reaction was maintained at this temperature and pressure for 2.5 h, at which point the esterification reaction was complete. During the polycondensation stage, the low-vacuum stage had a polycondensation reaction temperature of 250 ℃, a reaction pressure of -0.1 MPa (gauge pressure), and a reaction time of 0.5 h. The high-vacuum stage had a polycondensation reaction temperature of 280 ℃, a reaction system vacuum of 80 Pa, and a reaction time of 2 h, yielding polyester chips.

[0106] The glass transition temperature of the obtained polyester chips T g Temperature: 95.17℃; Intrinsic viscosity: 0.64 dL / g; Antibacterial rate against Escherichia coli: 50.3%; Antibacterial rate against Staphylococcus aureus: 53.1%; Tensile strength: 203 MPa longitudinally, 207 MPa transversely; Elongation at break: 92.7% longitudinally, 93.2% transversely; Water vapor transmission rate: 1.08 g / (m²) 2 •24h), oxygen permeability 22.926cm 3 / (cm 2 (24h, 0.1MPa). Some data are summarized in Table 1.

[0107] Comparative Example 3 Add purified terephthalic acid (1500 g), germanium dioxide (0.6 g), antioxidant 1010 (0.9 g), and colorant oil (2 g) to a 5 L stainless steel reactor. Add polyethylene glycol (degree of polymerization w = 25, 50 g), 1,4-cyclohexanediethanol (716 g), isosorbide (264 g), and ethylene glycol (364 g) to the reactor. Mix well and add the mixture to the reactor at a uniform rate over 3 h. After the addition is complete, keep the reactor at a constant temperature for 2 h under inert gas protection.

[0108] The reactor temperature was adjusted and set to 200 ℃, and the reaction pressure to 0.26 MPa (gauge pressure). The reaction was maintained at this temperature and pressure for 2.5 h, at which point the esterification reaction was complete. During the polycondensation stage, the low-vacuum stage had a polycondensation temperature of 250 ℃, a reaction pressure of -0.1 MPa (gauge pressure), and a reaction time of 0.5 h. The high-vacuum stage had a polycondensation temperature of 280 ℃, a reaction system vacuum of 80 Pa, and a reaction time of 2 h, yielding 1500 g of polyester chips.

[0109] Polyester chips (500 g) were thoroughly mixed with a silver nitrate standard solution (0.1 mg / mL, 5.7 g) and then added to a twin-screw extruder. The extruder temperature was set as follows: feed end (240 ℃), first stage heating (260 ℃), second stage heating (260 ℃), third stage heating (260 ℃), fourth stage heating (260 ℃), and die head heating (250 ℃) to prepare an antibacterial masterbatch. The prepared antibacterial masterbatch was then thoroughly mixed with the remaining chips (1000 g) and added to the twin-screw extruder at the same temperature as above to prepare heat-resistant antibacterial polyester chips.

[0110] The obtained heat-resistant and antibacterial polyester chips had a glass transition temperature (Tg) of 92.32℃; an intrinsic viscosity of 0.67 dL / g; an antibacterial rate of 65.7% against *Escherichia coli*; an antibacterial rate of 66.2% against *Staphylococcus aureus*; tensile strength of 178 MPa in the longitudinal direction and 181 MPa in the transverse direction; elongation at break of 96% in the longitudinal direction and 98% in the transverse direction; and a water vapor transmission rate of 1.59 g / (m²). 2 • 24h), oxygen permeability 25.524cm 3 / (cm 2 (24h, 0.1MPa). Some data are summarized in Table 1.

[0111] Comparative Example 4 Under nitrogen protection, a standard silver nitrate solution (0.1 mg / mL) and polyethylene glycol (molecular weight 200) were mixed thoroughly at a mass ratio of 1:25. The mixture was stirred at 80 °C for 2 h and then cooled to room temperature for later use. Purified terephthalic acid (1500 g), germanium dioxide (0.6 g), antioxidant 1010 (0.9 g), and colorant oil (2 g) were added to a 5 L stainless steel reactor. Silver-loaded polyethylene glycol (50 g), 1,4-cyclohexanediol (716 g), isosorbide (264 g), and ethylene glycol (364 g) were mixed thoroughly and added to the reactor at a uniform rate over 3 h. After the addition was complete, the reactor was kept at an inert gas level for 2 h.

[0112] The reactor temperature was adjusted and set to 200 ℃, and the reaction pressure to 0.26 MPa (gauge pressure). The reaction was maintained at this temperature and pressure for 2.5 h, at which point the esterification reaction was complete. During the polycondensation stage, the low-vacuum stage had a polycondensation temperature of 250 ℃, a reaction pressure of -0.1 MPa (gauge pressure), and a reaction time of 0.5 h. The high-vacuum stage had a polycondensation temperature of 280 ℃, a reaction system vacuum of 80 Pa, and a reaction time of 2 h, yielding an antibacterial and heat-resistant polyester.

[0113] The obtained antibacterial heat-resistant polyester has a glass transition temperature (Tg) of 101.2℃; an intrinsic viscosity of 0.61 dL / g; an antibacterial rate of 83.6% against *Escherichia coli*; an antibacterial rate of 81.4% against *Staphylococcus aureus*; a tensile strength of 198 MPa in the longitudinal direction and 201 MPa in the transverse direction; an elongation at break of 102% in the longitudinal direction and 101% in the transverse direction; and a water vapor transmission rate of 1.62 g / (m²). 2 • 24h), oxygen permeability 25.879cm 3 / (cm 2 (24h, 0.1MPa). Some data are summarized in Table 1.

[0114] Table 1

[0115] The preferred embodiments of the present invention have been described above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. An antibacterial and heat-resistant polyester, characterized in that, The polyester comprises repeating units as shown in the following formula: Where x, y, z, and q are non-zero natural numbers, and w is a natural number between 15 and 50.

2. The polyester according to claim 1, characterized in that, The molar ratio of x, y, z, and q is 3~7:1~4:2~8:0.01~0.5; and / or w is a natural number between 20 and 40.

3. The polyester according to claim 1 or 2, characterized in that, The molar ratio of x, y, z, and q is 4~6:1~2:3~4:0.16~0.3; and / or w is a natural number between 25 and 30.

4. The polyester according to claim 1 or 2, characterized in that, In the repeating unit of the polyester, The silver ion content in the chain segment is 2 × 10⁻⁶. -6 ~8×10 - 6 wt%.

5. The polyester according to claim 4, characterized in that, In the repeating unit of the polyester, The silver ion content in the chain segment is 3.2 × 10⁻⁶. -6 ~5×10 - 6 wt%.

6. The polyester according to claim 1 or 2, characterized in that, The polyester, The glass transition temperature is 95~110 ℃; and / or The antibacterial rate against Escherichia coli is 92-99.9%; and / or The antibacterial rate against Staphylococcus aureus is 93-99.9%; and / or Longitudinal tensile strength is 189~205 MPa; and / or The transverse tensile strength is 192~215 MPa; and / or The longitudinal elongation at break is 105-118%; and / or The transverse elongation at break is 103-122%; and / or Water vapor transmission rate is 1.23~1.40 g / (m²). 2 • 24h); and / or Oxygen permeability is 23.5~25.0 cm. 3 / (cm 2 ·24h·0.1MPa).

7. A method for preparing an antibacterial and heat-resistant polyester, characterized in that, The method includes: The silver-containing polyethylene glycol, 1,4-cyclohexanediol, isosorbide, ethylene glycol, terephthalic acid, catalyst, optional antioxidant and optional colorant are mixed and then subjected to esterification and polycondensation reactions. The silver-ion-containing polyethylene glycol has the following structural formula: , where w is a natural number between 15 and 50.

8. The preparation method according to claim 7, characterized in that, The method for preparing the silver ion-containing polyethylene glycol includes: mixing a silver ion solution with polyethylene glycol, wherein the degree of polymerization w of the polyethylene glycol is a natural number of 15 to 50.

9. The preparation method according to claim 8, characterized in that, The silver ion solution is one or more of silver nitrate solution and silver acetate solution; and / or The concentration of silver ions in the silver ion solution is 0.1~0.2 mg / mL; and / or The mass ratio of the silver ion solution to polyethylene glycol is 1:25~50; and / or The degree of polymerization w of the polyethylene glycol is a natural number from 20 to 40.

10. The preparation method according to claim 8, characterized in that, The conditions for mixing include: Performed in an inert gas atmosphere; and / or Performed under dynamic conditions; and / or Temperature is 60~120℃; and / or The time is 1.5 to 3.5 hours.

11. The preparation method according to claim 7, characterized in that, The molar ratio of silver-ion-containing polyethylene glycol, 1,4-cyclohexanediol, isosorbide, and ethylene glycol is 0.01~0.5:3~7:1.5~4:3.5~8.5; and / or The molar ratio of 1,4-cyclohexanediethanol to terephthalic acid is 0.1 to 1:1; and / or In polyethylene glycol containing silver ions, the silver ion content is 2 × 10⁻⁶. -6 ~8×10 -6 wt%.

12. The preparation method according to claim 11, characterized in that, The molar ratio of silver-ion-containing polyethylene glycol, 1,4-cyclohexanediol, isosorbide, and ethylene glycol is 0.16~0.3:4~6:1~2:5~8; and / or The molar ratio of 1,4-cyclohexanediethanol to terephthalic acid is 0.4~0.6:1; and / or In polyethylene glycol containing silver ions, the silver ion content is 3.2 × 10⁻⁶. -6 ~5×10 -6 wt%.

13. The preparation method according to claim 7, characterized in that, The amount of catalyst used is 300-800 ppm of the mass of terephthalic acid; and / or The catalyst is one or more of germanium-containing compounds, titanium-containing compounds, and cobalt-containing compounds; and / or The amount of the antioxidant is 500-1000 ppm of the mass of terephthalic acid; and / or The antioxidant is one or more of antioxidant 1010, antioxidant 1076, and antioxidant 168; and / or The amount of the toner used is 200-3000 ppm of the mass of terephthalic acid; and / or The colorant is one or more of color oil and color powder.

14. The preparation method according to claim 13, characterized in that, The amount of catalyst used is 410-520 ppm of the mass of terephthalic acid; and / or The catalyst is one or more of the following: a mixture of germanium-containing compounds and cobalt-containing compounds, or a mixture of germanium-containing compounds and titanium-containing compounds; and / or The amount of the antioxidant is 500-700 ppm of the mass of terephthalic acid; and / or The amount of the colorant used is 1100~1500 ppm of the mass of terephthalic acid.

15. The preparation method according to claim 7, characterized in that, The conditions for esterification include: Performed in an inert gas atmosphere; and / or Temperature is 150~260 ℃; and / or The pressure is 0.1~0.5 MPa; and / or The time is 1 to 5 hours.

16. The preparation method according to claim 7, characterized in that, The polycondensation reaction includes a low-vacuum polycondensation reaction and a high-vacuum polycondensation reaction carried out sequentially. The temperature of the low-vacuum polycondensation reaction is lower than that of the high-vacuum polycondensation reaction, and the pressure of the low-vacuum polycondensation reaction is higher than that of the high-vacuum polycondensation reaction.

17. The preparation method according to claim 16, characterized in that, The temperature of low-vacuum polycondensation reaction is 10~50 ℃ lower than that of high-vacuum polycondensation reaction, and the pressure of low-vacuum polycondensation reaction is 10~190 Pa higher than that of high-vacuum polycondensation reaction.

18. The preparation method according to claim 16 or 17, characterized in that, The conditions for low-vacuum polycondensation reactions include: Temperature is 250~270 ℃; and / or Pressure of 90~200 Pa; and / or The time is 0.5~4 hours; and / or The conditions for high-vacuum polycondensation reactions include: Temperature is 280~300 ℃; and / or Pressure of 10~80 Pa; and / or The time is 2 to 4 hours.

19. The preparation method according to claim 7, characterized in that, The method also includes: keeping the temperature for 1-2 hours before the esterification reaction begins.

20. An antibacterial and heat-resistant polyester, characterized in that, The antibacterial and heat-resistant polyester is prepared by the preparation method according to any one of claims 7-19.

21. The polyester according to claim 20, characterized in that, The polyester, The glass transition temperature is 95~110 ℃; and / or The antibacterial rate against Escherichia coli is 92-99.9%; and / or The antibacterial rate against Staphylococcus aureus is 93-99.9%; and / or Longitudinal tensile strength is 189~205 MPa; and / or The transverse tensile strength is 192~215 MPa; and / or The longitudinal elongation at break is 105-118%; and / or The transverse elongation at break is 103-122%; and / or Water vapor transmission rate is 1.23~1.40 g / (m²). 2 • 24h); and / or Oxygen permeability is 23.5~25.0 cm. 3 / (cm 2 ·24h·0.1MPa).

22. The application of an antibacterial and heat-resistant polyester in profiles, medical devices, and home appliances, characterized in that... The antibacterial and heat-resistant polyester is the antibacterial and heat-resistant polyester according to any one of claims 1-6 and 20-21.

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