A PET composition capable of improving thermal insulation performance and a preparation method thereof

Abstract

The present invention discloses a PET composition capable of improving thermal insulation performance and a preparation method thereof, belonging to the technical field of PET compositions, and is prepared from the following components by weight: 75.3-88.4 parts of polyethylene terephthalate; 3.9-8.0 parts of KBM603-rGO modifier; KBM603 and rGO in the KBM603-rGO modifier are in a mass ratio of 5-8:8-10; 10.5-12.0 parts of polyolefin elastomer; 8.3-13.4 parts of nano-zirconia filler obtained by microwave irradiation combined with surface modification. In the above manner, the PET composition prepared by the present invention has the advantages of good thermal insulation performance and excellent mechanical properties. Tested by an infrared transmittance measuring instrument, the infrared blocking rate is 88-91%, the visible light transmittance is 48-53%, the ultraviolet blocking rate is 96-97%, and the total thermal insulation rate is 71.1-74%.

Description

Technical Field

[0001] The present invention relates to the technical field of PET compositions, and in particular to a PET composition capable of improving thermal insulation performance and a preparation method thereof. Background Art

[0002] Polyethylene terephthalate, referred to as PET, has the characteristics of high strength, good wear resistance, and good resilience. PET resin can effectively improve its mechanical properties and heat resistance after chemical modification. The modified PET composition is widely used in fibers, films, engineering plastics, etc.

[0003] Polyethylene terephthalate (PET) itself has average thermal insulation properties, but it can be modified, such as adding silver nanosheets (such as CN 118745282 A) to the PET composition, and using the high reflective properties of silver nanosheets to increase light reflectivity and reduce heat absorption, thereby achieving the purpose of thermal insulation. However, silver nanosheets may oxidize, reducing their conductivity and reflective properties, affecting the thermal insulation effect. The preparation cost of silver nanosheets is high, and their large-scale use will significantly increase the production cost of thermal insulation film and reduce the market competitiveness of the product.

[0004] Based on this, the present invention designs a PET composition capable of improving thermal insulation performance and a preparation method thereof to solve the above problems. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a PET composition capable of improving thermal insulation performance and a preparation method thereof.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A PET composition capable of improving thermal insulation performance is prepared from the following components in parts by weight:

[0008] 75.3-88.4 parts of polyethylene terephthalate;

[0009] 3.9-8.0 parts of KBM603-rGO modifier; the mass ratio of KBM603 to rGO in the KBM603-rGO modifier is 5-8:8-10;

[0010] Polyolefin elastomer 10.5-12.0 parts;

[0011] 8.3-13.4 parts of nano zirconium oxide filler were obtained by microwave irradiation combined with surface modification treatment.

[0012] Furthermore, the preparation method of the KBM603-rGO modifier is:

[0013] Step (1): preparing rGO;

[0014] Step (2): KBM603 is dissolved in ethanol to prepare a KBM603 solution with a mass fraction of 3.5-5%, and rGO is dispersed in 2-3 times the volume of a 75% ethanol solution to form a uniform rGO dispersion; under stirring, the KBM603 solution is slowly added dropwise to the rGO dispersion, and after the addition is completed, the solution pH is adjusted to 7-8, and the reaction is carried out at 55-62 °C for 1.1-1.3 h, and then after centrifugation, washing and drying, a KBM603-rGO modifier powder is obtained.

[0015] Furthermore, the specific steps of step (1) are: weighing graphene oxide and adding it to deionized water to prepare a 2.5-3.2 mg / mL graphene oxide dispersion; slowly adding ascorbic acid to the graphene oxide dispersion under stirring conditions, the mass ratio of ascorbic acid to graphene oxide is 2-3:1, stirring and reacting at 55-70 °C for 4-4.5 h, the color of the solution turns black, and the solution is centrifuged, washed, and dried to obtain reduced graphene oxide.

[0016] Furthermore, the parameters of the microwave irradiation are: microwave frequency is 2.45 GHz, power is 600-800 W, and microwave irradiation time is 15-22 min.

[0017] Furthermore, the surface modification treatment adopts plasma treatment; the specific method is: placing the nano-zirconia filler after microwave irradiation treatment into the reaction chamber of the plasma treatment equipment, selecting argon as the plasma gas, the gas flow rate is 20~30 sccm, the radio frequency power is 100~200 W, the working pressure is 10~30 Pa, and the nano-zirconia filler is maintained in the plasma environment for 100~150 s to achieve surface modification of the nano-zirconia filler.

[0018] Furthermore, the mass ratio of polyethylene terephthalate to KBM603-rGO modifier was 14:1.

[0019] Furthermore, the mass ratio of polyethylene terephthalate to the nano-zirconia filler obtained by surface modification treatment combined with microwave irradiation is 7:1.

[0020] In order to better achieve the purpose of the present invention, the present invention also provides a method for preparing a PET composition capable of improving thermal insulation performance, the steps are as follows:

[0021] The dried polyethylene terephthalate particles were added into a high-speed mixer, and then the KBM603-rGO modifier powder was slowly added, the stirring speed was 150-200 r / min, and the mixture was stirred at 55-65 °C for 10-15 min, so that the KBM603-rGO modifier was uniformly adsorbed on the surface of the polyethylene terephthalate particles; then, the polyolefin elastomer preheated at 55-65 °C for 0.3-0.5 h and the nano-zirconia filler obtained by microwave irradiation combined with surface modification were premixed and added into the high-speed mixer, the stirring speed was increased to 350-500 r / min, and the mixture was stirred and mixed for 10-15 min; finally, the mixed materials were added into a twin-screw extruder for extrusion to obtain a PET composition with improved thermal insulation performance.

[0022] Furthermore, the feeding section temperature of the twin-screw extruder is set to 220~230 ℃, the melting section temperature is 250~260 ℃, the reaction section temperature is 260~280 ℃, the head temperature is 250~255 ℃, and the screw speed is controlled at 200~300 r / min.

[0023] In order to better achieve the purpose of the present invention, the present invention also provides a PET composition with improved thermal insulation performance prepared according to the preparation method.

[0024] Compared with the prior art, the present invention has the following beneficial effects: the present invention modifies PET by combining KBM603 with rGO, so that KBM603 is evenly coated on the surface of rGO, rGO agglomeration is prevented, and uniform dispersion of rGO in the PET matrix is ​​achieved, which is conducive to constructing a heat-insulating network structure and enhancing heat-insulating performance. The present invention optimizes microwave irradiation combined with surface modification treatment process, so that well-dispersed nano-zirconia particles can contact POE more evenly, which is conducive to uniformly wrapping POE molecular chains on the surface of nano-zirconia filler, reducing filler agglomeration, making nano-zirconia distribution stable and uniform, and improving compatibility with PET and other components, so as to better play a heat-insulating role. The PET composition prepared by the present invention has a high total heat insulation rate, good mechanical properties, good stability of the heat insulation effect of the product, and does not need to use high-cost silver nanosheets, etc., which is conducive to improving the market competitiveness of the product. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Embodiment 1: In some embodiments, a method for preparing a PET composition capable of improving thermal insulation performance comprises the following steps:

[0027] Step 1: Preparation of KBM603-rGO modifier

[0028] Step (1): Preparation of rGO: Weigh graphene oxide (GO) and add it to deionized water to prepare a 2.5 mg / mL graphene oxide dispersion. Slowly add ascorbic acid to the graphene oxide dispersion under stirring conditions. The mass ratio of ascorbic acid to graphene oxide is 3:1. Stir and react at 55 °C for 4.5 h. The color of the solution turns black. After centrifugation, washing, and drying, reduced graphene oxide (rGO) is obtained.

[0029] Step (2): dissolving 5 parts of KBM603 in ethanol to prepare a KBM603 solution with a mass fraction of 5%, and dispersing 8 parts of rGO in 3 times the volume of a 75% ethanol solution to form a uniform rGO dispersion; slowly dropping the KBM603 solution into the rGO dispersion under stirring conditions, adjusting the solution pH to 7 after the dropping is completed, reacting at 62 °C for 1.1 h, and then centrifuging, washing, and drying to obtain a KBM603-rGO modifier powder;

[0030] Step 2: Preparation of nano-zirconia filler obtained by microwave irradiation combined with surface modification

[0031] Step (1): subjecting the nano zirconium oxide filler to microwave irradiation; the microwave irradiation parameters are: microwave frequency of 2.45 GHz, power of 600 W, and microwave irradiation time of 22 min;

[0032] Step (2): Plasma treatment of the nano-zirconia filler; the specific method is: placing the nano-zirconia filler after microwave irradiation treatment into the reaction chamber of the plasma treatment equipment, selecting argon as the plasma gas, the gas flow rate is 20 sccm, the radio frequency power is 200 W, the working pressure is 10 Pa, and the nano-zirconia filler is kept in the plasma environment for 150 s to achieve surface modification of the nano-zirconia filler;

[0033] Step 3: weigh the raw materials: 75.3 parts of polyethylene terephthalate (PET); 8.0 parts of KBM603-rGO modifier; 10.5 parts of polyolefin elastomer (POE); 13.4 parts of nano-zirconia filler obtained by microwave irradiation combined with surface modification treatment;

[0034] Step 4: Add the dried polyethylene terephthalate particles into a high-speed mixer, then slowly add the KBM603-rGO modifier powder, stir at a speed of 150 r / min, and stir at 65 °C for 10 min to make the KBM603-rGO modifier uniformly adsorbed on the surface of the polyethylene terephthalate particles; then pre-mix the polyolefin elastomer preheated at 65 °C for 0.3 h and the nano zirconium oxide filler obtained by microwave irradiation combined with surface modification and add them to the high-speed mixer, increase the stirring speed to 500 r / min, and stir and mix for 10 min; finally, add the mixed materials to a twin-screw extruder for extrusion to obtain a PET composition with improved thermal insulation performance; the feeding section temperature of the twin-screw extruder is set to 220~230 °C, the melting section temperature is 250~260 °C, the reaction section temperature is 260~280 °C, the head temperature is 250~255 °C, and the screw speed is controlled at 200 r / min.

[0035] Mechanical properties test results: tensile strength: 102.5MPa; notched impact strength 20.4KJ / m 2 .

[0036] Tested by an infrared transmittance measuring instrument, the infrared blocking rate is 88%, the visible light transmittance is 51%, the ultraviolet blocking rate is 97%, and the total heat insulation rate is 71.1%.

[0037] Embodiment 2: In some embodiments, a method for preparing a PET composition capable of improving thermal insulation performance comprises the following steps:

[0038] Step 1: Preparation of KBM603-rGO modifier

[0039] Step (1): Preparation of rGO: Weigh graphene oxide (GO) and add it to deionized water to prepare a 3.2 mg / mL graphene oxide dispersion. Slowly add ascorbic acid to the graphene oxide dispersion under stirring conditions. The mass ratio of ascorbic acid to graphene oxide is 2:1. Stir and react at 70 °C for 4 h. The color of the solution turns black. After centrifugation, washing and drying, reduced graphene oxide (rGO) is obtained.

[0040] Step (2): 8 parts of KBM603 are dissolved in ethanol to prepare a KBM603 solution with a mass fraction of 3.5%, and 10 parts of rGO are dispersed in 2 times the volume of a 75% ethanol solution to form a uniform rGO dispersion; under stirring, the KBM603 solution is slowly added dropwise to the rGO dispersion, and after the addition is completed, the solution pH is adjusted to 8, and the reaction is carried out at 55°C for 1.3 h, and then centrifuged, washed, and dried to obtain a KBM603-rGO modifier powder;

[0041] Step 2: Preparation of nano-zirconia filler obtained by microwave irradiation combined with surface modification

[0042] Step (1): subjecting the nano-zirconia filler to microwave irradiation; the microwave irradiation parameters are: microwave frequency of 2.45 GHz, power of 800 W, and microwave irradiation time of 15 min;

[0043] Step (2): Plasma treatment of the nano-zirconia filler; the specific method is: placing the nano-zirconia filler after microwave irradiation treatment into the reaction chamber of the plasma treatment equipment, selecting argon as the plasma gas, the gas flow rate is 30 sccm, the radio frequency power is 100 W, the working pressure is 30 Pa, and the nano-zirconia filler is kept in the plasma environment for 100 s to achieve surface modification of the nano-zirconia filler;

[0044] Step 3: weigh the raw materials: 88.4 parts of polyethylene terephthalate (PET); 3.9 parts of KBM603-rGO modifier; 12.0 parts of polyolefin elastomer (POE); 8.3 parts of nano-zirconia filler obtained by microwave irradiation combined with surface modification treatment;

[0045] Step 4: Add the dried polyethylene terephthalate particles into a high-speed mixer, then slowly add the KBM603-rGO modifier powder, stir at a speed of 200 r / min, and stir at 55 °C for 15 min to make the KBM603-rGO modifier uniformly adsorbed on the surface of the polyethylene terephthalate particles; then pre-mix the polyolefin elastomer preheated at 55 °C for 0.5 h and the nano zirconium oxide filler obtained by microwave irradiation combined with surface modification and add them to the high-speed mixer, increase the stirring speed to 350 r / min, and stir and mix for 15 min; finally, add the mixed materials to a twin-screw extruder for extrusion to obtain a PET composition with improved thermal insulation performance; the feeding section temperature of the twin-screw extruder is set to 220~230 °C, the melting section temperature is 250~260 °C, the reaction section temperature is 260~280 °C, the head temperature is 250~255 °C, and the screw speed is controlled at 300 r / min.

[0046] Mechanical properties test results: tensile strength: 95.1MPa; notched impact strength 18.3KJ / m 2 .

[0047] Tested by an infrared transmittance measuring instrument, the infrared blocking rate is 91%, the visible light transmittance is 48%, the UV blocking rate is 96%, and the total heat insulation rate is 74%.

[0048] Embodiment 3: In some embodiments, a method for preparing a PET composition capable of improving thermal insulation performance comprises the following steps:

[0049] Step 1: Preparation of KBM603-rGO modifier

[0050] Step (1): Preparation of rGO: Weigh graphene oxide (GO) and add it to deionized water to prepare a 2.8 mg / mL graphene oxide dispersion. Slowly add ascorbic acid to the graphene oxide dispersion under stirring conditions. The mass ratio of ascorbic acid to graphene oxide is 2.2:1. Stir and react at 60 °C for 4 h. The color of the solution turns black. After centrifugation, washing and drying, reduced graphene oxide (rGO) is obtained.

[0051] Step (2): dissolving 6 parts of KBM603 in ethanol to prepare a KBM603 solution with a mass fraction of 4%, and dispersing 9 parts of rGO in 2 times the volume of a 75% ethanol solution to form a uniform rGO dispersion; under stirring, slowly adding the KBM603 solution to the rGO dispersion, adjusting the solution pH to 7.5 after the addition, reacting at 56 °C for 1.2 h, and then centrifuging, washing, and drying to obtain a KBM603-rGO modifier powder;

[0052] Step 2: Preparation of nano-zirconia filler obtained by microwave irradiation combined with surface modification

[0053] Step (1): subjecting the nano zirconium oxide filler to microwave irradiation; the microwave irradiation parameters are: microwave frequency of 2.45 GHz, power of 700 W, and microwave irradiation time of 20 min;

[0054] Step (2): Plasma treatment of the nano-zirconia filler; the specific method is: placing the nano-zirconia filler after microwave irradiation treatment into the reaction chamber of the plasma treatment equipment, selecting argon as the plasma gas, the gas flow rate is 25 sccm, the radio frequency power is 180 W, the working pressure is 18 Pa, and the nano-zirconia filler is kept in the plasma environment for 130 seconds to achieve surface modification of the nano-zirconia filler;

[0055] Step 3: weigh the raw materials: 84 parts of polyethylene terephthalate (PET); 6 parts of KBM603-rGO modifier; 11 parts of polyolefin elastomer (POE); 12 parts of nano-zirconia filler obtained by microwave irradiation combined with surface modification treatment;

[0056] Step 4: Add the dried polyethylene terephthalate particles into a high-speed mixer, then slowly add the KBM603-rGO modifier powder, stir at a speed of 175 r / min, and stir at 58 °C for 12 min to make the KBM603-rGO modifier uniformly adsorbed on the surface of the polyethylene terephthalate particles; then pre-mix the polyolefin elastomer preheated at 58 °C for 0.4 h and the nano zirconium oxide filler obtained by microwave irradiation combined with surface modification and add them to the high-speed mixer, increase the stirring speed to 400 r / min, and stir and mix for 12 min; finally, add the mixed materials to a twin-screw extruder for extrusion to obtain a PET composition with improved thermal insulation performance; the feeding section temperature of the twin-screw extruder is set to 220~230 °C, the melting section temperature is 250~260 °C, the reaction section temperature is 260~280 °C, the head temperature is 250~255 °C, and the screw speed is controlled at 250 r / min.

[0057] Mechanical properties test results: tensile strength: 99.6MPa; notched impact strength 19.3KJ / m 2 .

[0058] Tested by an infrared transmittance measuring instrument, the infrared blocking rate is 90%, the visible light transmittance is 53%, the UV blocking rate is 96%, and the total heat insulation rate is 71.3%.

[0059] Comparative Example 1: The difference from Example 3 is that the nano-zirconia filler obtained by microwave irradiation combined with surface modification treatment is replaced by ordinary nano-zirconia filler.

[0060] Mechanical properties test results: tensile strength: 83.1MPa; notched impact strength 15.0KJ / m 2 .

[0061] Tested by an infrared transmittance measuring instrument, the infrared blocking rate is 81%, the visible light transmittance is 58%, the UV blocking rate is 90%, and the total heat insulation rate is 64.1%.

[0062] Comparative Example 2: The difference from Example 3 is that: 9 parts of KBM603 are dissolved in ethanol to prepare a KBM603 solution with a mass fraction of 4%, and 6 parts of rGO are dispersed in 2 times the volume of a 75% ethanol solution with a mass fraction to form a uniform rGO dispersion; under stirring, the KBM603 solution is slowly added dropwise to the rGO dispersion, and after the addition is completed, the solution pH is adjusted to 7.5, and the reaction is carried out at 56°C for 1.2 h. After that, the KBM603-rGO modifier powder is obtained after centrifugation, washing and drying.

[0063] Mechanical properties test results: tensile strength: 79.5MPa; notched impact strength 13.6KJ / m 2 .

[0064] Tested by an infrared transmittance measuring instrument, the infrared blocking rate is 80%, the visible light transmittance is 52%, the UV blocking rate is 91%, and the total heat insulation rate is 66.25%.

[0065] Comparative Example 3: The difference from Example 3 is that the preheated polyolefin elastomer and the nano zirconium oxide filler obtained by microwave irradiation combined with surface modification treatment are not premixed, but directly added to the high-speed mixer. That is, step 4: add the dried polyethylene terephthalate particles to the high-speed mixer, and then slowly add the KBM603-rGO modifier powder, stirring at a speed of 175 r / min, stirring at 58 ° C for 12 min, so that the KBM603-rGO modifier is uniformly adsorbed on the surface of the polyethylene terephthalate particles; then, the polyolefin elastomer preheated at 58 ° C for 0.4 h and the nano zirconium oxide filler obtained by microwave irradiation combined with surface modification treatment are added to the high-speed mixer respectively, the stirring speed is increased to 400 r / min, and the stirring is mixed for 12 min; finally, the mixed materials are added to the twin-screw extruder for extrusion to obtain a PET composition with improved thermal insulation performance.

[0066] Mechanical properties test results: tensile strength: 90.4MPa; notched impact strength 17.7KJ / m 2 .

[0067] Tested by an infrared transmittance measuring instrument, the infrared blocking rate is 87%, the visible light transmittance is 55%, the UV blocking rate is 93%, and the total heat insulation rate is 68.7%.

[0068] The present invention modifies PET by combining KBM603 with rGO, so that KBM603 is evenly coated on the surface of rGO, rGO agglomeration is prevented, and uniform dispersion of rGO in the PET matrix is ​​achieved, which is conducive to building a heat-insulating network structure and enhancing heat-insulating performance. The present invention optimizes microwave irradiation combined with a surface modification treatment process, so that well-dispersed nano-zirconia particles can contact POE more evenly, which is conducive to uniformly wrapping POE molecular chains on the surface of nano-zirconia fillers, reducing the agglomeration of fillers, making the distribution of nano-zirconia stable and uniform, and improving the compatibility with PET and other components, so as to better play a heat-insulating role. The PET composition prepared by the present invention has a high total heat insulation rate, good mechanical properties, good stability of the heat-insulating effect of the product, and does not need to use high-cost silver nanosheets, etc., which is conducive to improving the market competitiveness of the product.

[0069] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A PET composition capable of improving thermal insulation performance, characterized in that: It is prepared from the following components by weight: 75.3-88.4 parts of polyethylene terephthalate; 3.9-8.0 parts of KBM603-rGO modifier; the mass ratio of KBM603 to rGO in the KBM603-rGO modifier is 5-8:8-10; Polyolefin elastomer 10.5-12.0 parts; 8.3-13.4 parts of nano-zirconia filler obtained by microwave irradiation combined with surface modification treatment; The surface modification treatment adopts plasma treatment; the specific method is: the nano-zirconia filler treated by microwave irradiation is placed in the reaction chamber of the plasma treatment equipment, argon is selected as the plasma gas, the gas flow rate is 20-30 sccm, the radio frequency power is 100-200 W, the working pressure is 10-30 Pa, the nano-zirconia filler is kept in the plasma environment for 100-150 s, and the surface modification of the nano-zirconia filler is achieved; The preparation method of the PET composition capable of improving thermal insulation performance comprises the following steps: adding dried polyethylene terephthalate particles into a high-speed mixer, then slowly adding KBM603-rGO modifier powder, stirring at a speed of 150-200 r / min, stirring at 55-65°C for 10-15 min, so that KBM603-rGO is uniformly adsorbed on the surface of the polyethylene terephthalate particles; then pre-mixing a polyolefin elastomer preheated at 55-65°C for 0.3-0.5 h and a nano-zirconia filler obtained by combining microwave irradiation with surface modification, and adding the mixture to the high-speed mixer, increasing the stirring speed to 350-500 r / min, and stirring and mixing for 10-15 min; finally, adding the mixed material into a twin-screw extruder for extrusion.

2. The PET composition capable of improving thermal insulation performance according to claim 1, characterized in that: The preparation method of the KBM603-rGO modifier is: Step (1), preparing rGO; Step (2), dissolving KBM603 in ethanol to prepare a KBM603 solution with a mass fraction of 3.5-5%, and dispersing rGO in 2-3 times the volume of a 75% ethanol solution to form a uniform rGO dispersion; Under stirring conditions, the KBM603 solution was slowly added to the rGO dispersion. After the addition was completed, the solution pH was adjusted to 7-8. The reaction was carried out at 55-62 °C for 1.1-1.3 h. After centrifugation, washing and drying, the KBM603-rGO modifier powder was obtained.

3. The PET composition capable of improving thermal insulation performance according to claim 2, characterized in that: The specific steps of step (1) are as follows: weighing graphene oxide and adding it to deionized water to prepare a 2.5-3.2 mg / mL graphene oxide dispersion; slowly adding ascorbic acid to the graphene oxide dispersion under stirring conditions, with the mass ratio of ascorbic acid to graphene oxide being 2-3:1, stirring and reacting at 55-70°C for 4-4.5 hours until the color of the solution turns black, and obtaining reduced graphene oxide after the solution is centrifuged, washed, and dried.

4. The PET composition capable of improving thermal insulation performance according to claim 1, characterized in that: The parameters of the microwave irradiation are as follows: microwave frequency is 2.45 GHz, power is 600-800 W, and microwave irradiation time is 15-22 min.

5. The PET composition capable of improving thermal insulation performance according to claim 1, characterized in that: The mass ratio of polyethylene terephthalate to KBM603-rGO modifier is 14:

1.

6. The PET composition capable of improving thermal insulation performance according to claim 1, characterized in that: The mass ratio of polyethylene terephthalate to nano-zirconia filler obtained by surface modification treatment combined with microwave irradiation is 7:

1.

7. The method for preparing a PET composition capable of improving thermal insulation performance according to claim 6, characterized in that: The feeding section temperature of the twin-screw extruder can be set to 220~230 ℃, the melting section temperature to 250~260 ℃, the reaction section temperature to 260~280 ℃, the die temperature to 250~255 ℃, and the screw speed to 200~300 r / min.

8. A PET composition with improved thermal insulation performance prepared according to the preparation method according to claim 7.