Conductive pet composite and method for producing the same

Abstract

The application discloses a conductive PET composite material and a preparation method thereof, and the conductive PET composite material is made of the following components in parts by weight: PET 92-102 parts, conductive filler 12-16 parts, and antioxidant 0.1-0.5 parts. The preparation method of the conductive filler is as follows: firstly, dopamine modified fullerene is synthesized; and then, N-(beta-aminoethyl)-gamma-aminopropylmethyl-dimethoxysilane modified tin oxide is synthesized; because the catechol groups on the surface of the dopamine modified fullerene can have hydrogen bond action with the amino groups in the methoxysilane groups on the surface of the modified tin oxide, a conductive filler of the dopamine modified fullerene / N-(beta-aminoethyl)-gamma-aminopropylmethyl-dimethoxysilane modified tin oxide type is formed. By adding the conductive filler into the PET, the PET has excellent conductive performance, which has very important significance for expanding the application of the PET composite material.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of high polymer materials, and particularly relates to a conductive PET composite material and a preparation method thereof. BACKGROUND

[0002] Polyethylene terephthalate (PET) is the most important variety of thermoplastic polyester, commonly known as polyester resin. It is prepared by ester exchange of dimethyl terephthalate and ethylene glycol or by esterification of terephthalic acid and ethylene glycol to synthesize bis-hydroxyethyl terephthalate, and then performing polycondensation reaction. PET is a milky white or light yellow, highly crystalline polymer, and has excellent physical and mechanical properties in a wide temperature range, and the use temperature can reach 120 DEG C. PET is resistant to oil, fat, dilute acid, dilute alkali, and most solvents. Although the comprehensive performance of PET is very excellent, the conductive performance of PET is general, which greatly limits the application range of PET composite materials. SUMMARY

[0003] In view of the deficiencies of the prior art, the purpose of the present application is to provide a conductive PET composite material and a preparation method thereof. The present application adds a specific conductive filler to PET to make PET have excellent conductive performance.

[0004] The purpose of the present application is achieved by the following technical solutions:

[0005] A conductive PET composite material is prepared from the following components by weight:

[0006] PET 92-102 parts,

[0007] conductive filler 12-16 parts,

[0008] antioxidant 0.1-0.5 parts;

[0009] The preparation method of the conductive filler is as follows:

[0010] S1, dopamine hydrochloride, Tris buffer solution, fullerene, ethanol and deionized water are mixed uniformly in a reaction vessel, and then reacted at a temperature of 60-80 DEG C for 8-12 h. The reaction liquid is filtered to obtain solid material, the solid material is washed, and then dried in a vacuum drying oven at 70-80 DEG C for 6-10 h to obtain dopamine modified fullerene.

[0011] S2, tin chloride, ammonia water, ethanol and deionized water are mixed uniformly in a reaction vessel, and then reacted at a temperature of 50-70 DEG C for 10-12 h. The reaction liquid is filtered to obtain solid material, the solid material is washed, and then dried in a vacuum drying oven at 60-80 DEG C for 12-16 h to obtain solid A.

[0012] S3, solid A is placed in a muffle furnace at 720-760℃ for 20-24h to obtain tin oxide.

[0013] S4, tin oxide, N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane, ethanol, deionized water are placed in a reaction vessel, mixed uniformly, and then placed in a temperature of 40-50℃ for 12-14h. The reaction solution is filtered to obtain solid material. The solid material is washed and then placed in a vacuum drying oven at 50-70℃ for 8-16h to obtain N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane modified tin oxide.

[0014] S5, dopamine modified fullerene, N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane modified tin oxide, ethanol, deionized water are placed in a reaction vessel, mixed uniformly, and then placed in a temperature of 30-50℃ for 6-10h. The reaction solution is filtered to obtain solid material. The solid material is washed and then placed in a vacuum drying oven at 60-70℃ for 8-12h to obtain dopamine modified fullerene / N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane modified tin oxide type conductive filler.

[0015] Preferably, the mass ratio of dopamine hydrochloride, Tris buffer, fullerene, ethanol, deionized water in S1 step is (16-20):(24-30):(40-50):(60-80):(80-120).

[0016] Preferably, the mass ratio of tin chloride, ammonia, ethanol, deionized water in S2 step is (20-30):(24-30):(50-60):(70-80).

[0017] Preferably, the mass ratio of tin oxide, N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane, ethanol, deionized water in S4 step is (24-30):(8-12):(60-70):(80-90).

[0018] Preferably, the mass ratio of dopamine modified fullerene, N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane modified tin oxide, ethanol, deionized water in S5 step is (26-30):(28-32):(50-56):(70-80).

[0019] Further, the antioxidant is at least one of tris(2,4-di-tert-butyl) phenyl phosphite (Irganox 168), tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester (Irganox 1010), 1,3,5-trimethyl-2,4,6-(3,5-di-tert-butyl-4-hydroxybenzyl) benzene (Irganox 1330).

[0020] The application further provides a preparation method of the conductive PET composite material, comprising the following steps:

[0021] (1) 92-102 parts of PET, 12-16 parts of conductive filler and 0.1-0.5 parts of antioxidant are weighed and uniformly mixed to obtain a mixture;

[0022] (2) the mixture obtained in step (1) is extruded and granulated from a double-screw extruder to obtain the conductive PET composite material. Further, the double-screw extruder comprises six temperature zones arranged in sequence, and the temperature of each zone is as follows: the temperature of the first zone is 240-260 DEG C, the temperature of the second zone is 280-300 DEG C, the temperature of the third zone is 280-300 DEG C, the temperature of the fourth zone is 280-300 DEG C, the temperature of the fifth zone is 280-300 DEG C, and the temperature of the sixth zone is 280-300 DEG C; the temperature of the die head of the double-screw extruder is 280-300 DEG C, and the rotation speed of the screw is 200-280 r / min.

[0023] The application has the following beneficial effects:

[0024] (1) the chemical equation for preparing tin oxide is as follows:

[0025] NH3·H2O→NH4 + +OH -

[0026] Sn 4+ +4OH - →Sn(OH)4

[0027] Sn(OH)4→SnO2+2H2O.

[0028] (2) the application first synthesizes a dopamine modified fullerene, and then synthesizes an N-(beta-aminoethyl)-gamma-aminopropylmethyl-dimethoxysilane modified tin oxide, because the catechol groups on the surface of the modified fullerene can form hydrogen bonds with the amino groups in the methoxysilane groups on the surface of the modified tin oxide, thereby forming a dopamine modified fullerene / N-(beta-aminoethyl)-gamma-aminopropylmethyl-dimethoxysilane modified tin oxide type conductive filler.

[0029] (3) the dimethoxysilane groups in the N-(beta-aminoethyl)-gamma-aminopropylmethyl-dimethoxysilane can be chemically bonded to the oxygen atoms on the surface of the tin oxide, thereby enhancing the binding strength of the N-(beta-aminoethyl)-gamma-aminopropylmethyl-dimethoxysilane and the tin oxide.

[0030] (4) The conductive filler contains dopamine and N-(beta-aminoethyl)-gamma-aminopropylmethyl-dimethoxysilane, wherein the dopamine contains a catechol group, and the N-(beta-aminoethyl)-gamma-aminopropylmethyl-dimethoxysilane contains a methoxysilane group, which improves the interfacial compatibility of the conductive filler with PET, and is beneficial to the dispersibility of the conductive filler in PET, thereby being beneficial to improving the conductivity and physical properties of the PET composite material. The PET composite material prepared by the application has excellent conductivity and physical and mechanical properties, and has great popularization significance. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present application, the present application will be described more fully below with specific embodiments. However, the present application can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing the specific embodiments, and are not intended to limit the present application.

[0033] The raw materials used in the following examples are as follows:

[0034] PET (model 008L), Aclo, Canada; Tris buffer, Hubei Kovod Chemical Co., Ltd.; ammonia, Shandong Baihua Chemical Co., Ltd.; ethanol, Jinan Mingxin Chemical Co., Ltd.; fullerene, Wuhan Jushun Chemical Co., Ltd.; tin chloride, Wuhan Jiyesheng Chemical Co., Ltd.; N-(beta-aminoethyl)-gamma-aminopropylmethyl-dimethoxysilane, Nanjing Aocheng Chemical Co., Ltd.; dopamine hydrochloride, Hubei Ruiboshen Chemical Co., Ltd.; deionized water, Shanghai Lan Yi Environmental Protection Technology Co., Ltd.; fullerene, Puyang Yongxin Fullerene Technology Co., Ltd.; tin oxide, Shijiazhuang Dongming New Material Technology Co., Ltd.; antioxidants (models Irganox 168, Irganox 1010, Irganox 1330), BASF, Germany.

[0035] The above reagents are only used to illustrate the source and composition of the reagents used in the experiments of the present application, in order to fully disclose, and do not mean that other similar reagents or reagents provided by other suppliers cannot realize the present application.

[0036] Preparation Example 1

[0037] S1, 160 g of dopamine hydrochloride, 240 g of Tris buffer solution, 400 g of fullerene, 600 g of ethanol, 800 g of deionized water were placed in a reaction vessel and mixed uniformly, and then reacted at 60℃ for 8h. The reaction liquid was filtered to obtain solid material. The solid material was washed and then dried in a vacuum drying oven at 70℃ for 6h to obtain dopamine modified fullerene.

[0038] S2, 200 g of tin chloride, 240 g of ammonia water, 500 g of ethanol, 700 g of deionized water were placed in a reaction vessel and mixed uniformly, and then reacted at 50℃ for 10h. The reaction liquid was filtered to obtain solid material. The solid material was washed and then dried in a vacuum drying oven at 60℃ for 12h to obtain solid A.

[0039] S3, solid A was placed in a muffle furnace at 720℃ and calcined for 20h to obtain tin oxide.

[0040] S4, 240 g of tin oxide, 80 g of N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane, 600 g of ethanol, 800 g of deionized water were placed in a reaction vessel and mixed uniformly, and then reacted at 40℃ for 12h. The reaction liquid was filtered to obtain solid material. The solid material was washed and then dried in a vacuum drying oven at 50℃ for 8h to obtain N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane modified tin oxide.

[0041] S5, 260 g of dopamine modified fullerene, 280 g of N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane modified tin oxide, 500 g of ethanol, 700 g of deionized water were placed in a reaction vessel and mixed uniformly, and then reacted at 30℃ for 6h. The reaction liquid was filtered to obtain solid material. The solid material was washed and then dried in a vacuum drying oven at 60℃ for 8h to obtain dopamine modified fullerene / N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane modified tin oxide type conductive filler M1.

[0042] Example 1

[0043] (1) 92 parts of PET, 12 parts of conductive filler M1, and 0.1 parts of Irganox 168 were weighed and mixed and stirred uniformly to obtain a mixture;

[0044] (2) The mixture obtained in step (1) was extruded and granulated to obtain PET composite material P1.

[0045] The temperature and screw speed of each zone of the twin-screw extruder were as follows: the temperature of zone 1 was 240℃, the temperature of zone 2 was 280℃, the temperature of zone 3 was 280℃, the temperature of zone 4 was 280℃, the temperature of zone 5 was 280℃, the temperature of zone 6 was 280℃, the temperature of the die head was 280℃, and the screw speed was 200r / min.

[0046] Preparation Example 2

[0047] S1, 200 g of dopamine hydrochloride, 300 g of Tris buffer solution, 500 g of fullerene, 800 g of ethanol, and 1.2 kg of deionized water were mixed in a reaction vessel, and then the mixture was reacted at 80°C for 12 hours. The reaction solution was filtered to obtain a solid, which was washed and then dried in a vacuum drying oven at 80°C for 10 hours to obtain dopamine-modified fullerene.

[0048] S2, 300 g of tin chloride, 300 g of ammonia water, 600 g of ethanol, and 800 g of deionized water were mixed in a reaction vessel, and then the mixture was reacted at 70°C for 12 hours. The reaction solution was filtered to obtain a solid, which was washed and then dried in a vacuum drying oven at 80°C for 16 hours to obtain solid A.

[0049] S3, solid A was calcined in a muffle furnace at 760°C for 24 hours to obtain tin oxide.

[0050] S4, 300 g of tin oxide, 120 g of N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane, 700 g of ethanol, and 900 g of deionized water were mixed in a reaction vessel, and then the mixture was reacted at 50°C for 14 hours. The reaction solution was filtered to obtain a solid, which was washed and then dried in a vacuum drying oven at 70°C for 16 hours to obtain N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane-modified tin oxide.

[0051] S5, 300 g of dopamine-modified fullerene, 320 g of N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane-modified tin oxide, 560 g of ethanol, and 800 g of deionized water were mixed in a reaction vessel, and then the mixture was reacted at 50°C for 10 hours. The reaction solution was filtered to obtain a solid, which was washed and then dried in a vacuum drying oven at 70°C for 12 hours to obtain dopamine-modified fullerene / N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane-modified tin oxide type conductive filler M2.

[0052] Example 2

[0053] (1) 102 parts of PET, 16 parts of conductive filler M2, 0.1 part of Irganox 168, 0.2 part of Irganox 1010, and 0.2 part of Irganox 1330 were mixed and stirred uniformly to obtain a mixture.

[0054] (2) The mixture obtained in step (1) was extruded and granulated to obtain PET composite material P2.

[0055] The temperature and screw speed of each zone of the twin-screw extruder are as follows: the temperature of the first zone is 260℃, the temperature of the second zone is 300℃, the temperature of the third zone is 300℃, the temperature of the fourth zone is 300℃, the temperature of the fifth zone is 300℃, the temperature of the sixth zone is 300℃, the temperature of the head is 300℃, and the screw speed is 280r / min.

[0056] Preparation Example 3

[0057] S1, 180g of dopamine hydrochloride, 270g of Tris buffer solution, 450g of fullerene, 700g of ethanol, and 1.0kg of deionized water were mixed in a reaction vessel, and then the mixture was reacted at 70℃ for 10h. The reaction solution was filtered to obtain solid, which was washed and then dried in a vacuum drying oven at 75℃ for 8h to obtain dopamine modified fullerene.

[0058] S2, 250g of tin chloride, 270g of ammonia water, 550g of ethanol, and 750g of deionized water were mixed in a reaction vessel, and then the mixture was reacted at 60℃ for 11h. The reaction solution was filtered to obtain solid, which was washed and then dried in a vacuum drying oven at 70℃ for 14h to obtain solid A.

[0059] S3, solid A was calcined in a muffle furnace at 740℃ for 22h to obtain tin oxide.

[0060] S4, 270g of tin oxide, 100g of N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane, 650g of ethanol, and 850g of deionized water were mixed in a reaction vessel, and then the mixture was reacted at 45℃ for 13h. The reaction solution was filtered to obtain solid, which was washed and then dried in a vacuum drying oven at 60℃ for 12h to obtain N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane modified tin oxide.

[0061] S5, 280g of dopamine modified fullerene, 300g of N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane modified tin oxide, 530g of ethanol, and 750g of deionized water were mixed in a reaction vessel, and then the mixture was reacted at 40℃ for 8h. The reaction solution was filtered to obtain solid, which was washed and then dried in a vacuum drying oven at 65℃ for 10h to obtain dopamine modified fullerene / N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane modified tin oxide type conductive filler M3.

[0062] Example 3

[0063] (1) 97 parts of PET, 14 parts of conductive filler M3, 0.1 part of Irganox 168, and 0.2 part of Irganox 1010 were mixed and stirred uniformly to obtain a mixture;

[0064] (2) The mixture obtained in step (1) is extruded and granulated to obtain the PET composite material P3.

[0065] The temperature and screw speed of each zone of the twin-screw extruder are as follows: the temperature of zone 1 is 250℃, the temperature of zone 2 is 290℃, the temperature of zone 3 is 290℃, the temperature of zone 4 is 290℃, the temperature of zone 5 is 290℃, the temperature of zone 6 is 290℃, the temperature of the die head is 290℃, and the screw speed is 240r / min.

[0066] Preparation Example 4

[0067] S1, 165g of dopamine hydrochloride, 255g of Tris buffer solution, 435g of fullerene, 715g of ethanol, 1.15kg of deionized water were mixed uniformly in a reaction vessel, and then reacted at 78℃ for 11h. The reaction liquid was filtered to obtain solid material. The solid material was washed and then dried in a vacuum drying oven at 73℃ for 9h to obtain dopamine modified fullerene.

[0068] S2, 225g of tin chloride, 265g of ammonia water, 535g of ethanol, 745g of deionized water were mixed uniformly in a reaction vessel, and then reacted at 68℃ for 11h. The reaction liquid was filtered to obtain solid material. The solid material was washed and then dried in a vacuum drying oven at 76℃ for 14.5h to obtain solid A.

[0069] S3, solid A was calcined in a muffle furnace at 735℃ for 23h to obtain tin oxide.

[0070] S4, 275g of tin oxide, 95g of N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane, 635g of ethanol, 845g of deionized water were mixed uniformly in a reaction vessel, and then reacted at 48℃ for 13.5h. The reaction liquid was filtered to obtain solid material. The solid material was washed and then dried in a vacuum drying oven at 58℃ for 14h to obtain N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane modified tin oxide.

[0071] S5, 295g of dopamine modified fullerene, 315g of N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane modified tin oxide, 535g of ethanol, 735g of deionized water were mixed uniformly in a reaction vessel, and then reacted at 45℃ for 8.5h. The reaction liquid was filtered to obtain solid material. The solid material was washed and then dried in a vacuum drying oven at 66℃ for 11h to obtain dopamine modified fullerene / N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane modified tin oxide type conductive filler M4.

[0072] Example 4

[0073] (1) Take 95 parts of PET, 15 parts of conductive filler M4, 0.1 parts of Irganox1010, 0.2 parts of Irganox1330, mix and stir uniformly to obtain a mixture;

[0074] (2) The mixture obtained in step (1) is extruded and granulated to obtain PET composite material P4.

[0075] The temperature and screw speed of each zone of the twin-screw extruder are as follows: the temperature of zone 1 is 245℃, the temperature of zone 2 is 285℃, the temperature of zone 3 is 285℃, the temperature of zone 4 is 285℃, the temperature of zone 5 is 285℃, the temperature of zone 6 is 285℃, the temperature of the die head is 285℃, and the screw speed is 255r / min.

[0076] Preparation Example 5

[0077] S1, 188g of dopamine hydrochloride, 255g of Tris buffer solution, 435g of fullerene, 645g of ethanol, 925g of deionized water were mixed uniformly in a reaction vessel, and then reacted at 77℃ for 9.5h. The reaction liquid was filtered to obtain solid material, which was washed and then dried in a vacuum drying oven at 72℃ for 9.5h to obtain dopamine modified fullerene.

[0078] S2, 288g of tin chloride, 268g of ammonia water, 535g of ethanol, 745g of deionized water were mixed uniformly in a reaction vessel, and then reacted at 66℃ for 11.5h. The reaction liquid was filtered to obtain solid material, which was washed and then dried in a vacuum drying oven at 76℃ for 14.5h to obtain solid A.

[0079] S3, solid A was calcined in a muffle furnace at 758℃ for 23.5h to obtain tin oxide.

[0080] S4, 255g of tin oxide, 115g of N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane, 655g of ethanol, 845g of deionized water were mixed uniformly in a reaction vessel, and then reacted at 48℃ for 13.5h. The reaction liquid was filtered to obtain solid material, which was washed and then dried in a vacuum drying oven at 58℃ for 14h to obtain N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane modified tin oxide.

[0081] S5, 298 g of dopamine modified fullerene, 315 g of N-(β-aminoethyl)-γ- aminopropylmethyl-dimethoxysilane modified tin oxide, 535 g of ethanol, 765 g of deionized water were placed in a reaction vessel and mixed uniformly, then placed in a temperature of 38℃ for 9.5 h, the reaction solution was filtered to obtain solid, the solid was washed and placed in a vacuum drying oven at 66℃ for 11.5 h, to obtain a dopamine modified fullerene / N-(β-aminoethyl)-γ- aminopropylmethyl-dimethoxysilane modified tin oxide type conductive filler M5.

[0082] Example 5

[0083] (1) 100 parts of PET, 13 parts of conductive filler M5, 0.2 parts of Irganox 1010, 0.2 parts of Irganox 1330 were weighed and mixed and stirred uniformly to obtain a mixture;

[0084] (2) The mixture obtained in step (1) was extruded and granulated to obtain a PET composite material P5.

[0085] The temperature and screw speed of each zone of the twin-screw extruder were as follows: the temperature of zone 1 was 250℃, the temperature of zone 2 was 295℃, the temperature of zone 3 was 295℃, the temperature of zone 4 was 295℃, the temperature of zone 5 was 295℃, the temperature of zone 6 was 295℃, the temperature of the die head was 295℃, and the screw speed was 270 r / min.

[0086] Comparative Example 1

[0087] (1) 100 parts of PET, 0.2 parts of Irganox 1010, 0.2 parts of Irganox 1330 were weighed and mixed and stirred uniformly to obtain a mixture;

[0088] (2) The mixture obtained in step (1) was extruded and granulated to obtain a PET composite material D1.

[0089] The temperature and screw speed of each zone of the twin-screw extruder were as follows: the temperature of zone 1 was 250℃, the temperature of zone 2 was 295℃, the temperature of zone 3 was 295℃, the temperature of zone 4 was 295℃, the temperature of zone 5 was 295℃, the temperature of zone 6 was 295℃, the temperature of the die head was 295℃, and the screw speed was 270 r / min.

[0090] Comparative Example 2

[0091] (1) 100 parts of PET, 13 parts of tin oxide, 0.2 parts of Irganox 1010, 0.2 parts of Irganox 1330 were weighed and mixed and stirred uniformly to obtain a mixture;

[0092] (2) The mixture obtained in step (1) was extruded and granulated to obtain a PET composite material D2.

[0093] The temperature and screw speed of each zone of the twin-screw extruder are as follows: the temperature of the first zone is 250 DEG C, the temperature of the second zone is 295 DEG C, the temperature of the third zone is 295 DEG C, the temperature of the fourth zone is 295 DEG C, the temperature of the fifth zone is 295 DEG C, the temperature of the sixth zone is 295 DEG C, the temperature of the head is 295 DEG C, and the screw speed is 270 r / min.

[0094] Comparative Example 3

[0095] (1) 100 parts of PET, 13 parts of fullerene, 0.2 parts of Irganox 1010 and 0.2 parts of Irganox 1330 were weighed and mixed and stirred uniformly to obtain a mixture;

[0096] (2) The mixture obtained in step (1) was extruded and granulated to obtain a PET composite material D3.

[0097] The temperature and screw speed of each zone of the twin-screw extruder are as follows: the temperature of the first zone is 250 DEG C, the temperature of the second zone is 295 DEG C, the temperature of the third zone is 295 DEG C, the temperature of the fourth zone is 295 DEG C, the temperature of the fifth zone is 295 DEG C, the temperature of the sixth zone is 295 DEG C, the temperature of the head is 295 DEG C, and the screw speed is 270 r / min.

[0098] Performance test:

[0099] The surface resistivity of the materials prepared in each example and comparative example was tested according to the test standard GB / T 31838.3, the tensile strength was tested according to ASTM D638, the bending modulus was tested according to ASTM D790, and the cantilever beam notched impact strength was tested according to ASTM D256, and the test results are shown in Table 1:

[0100] Table 1

[0101]

[0102] From the above table, it can be seen that:

[0103] In summary, the conductive properties of P1-P5 are obviously better than those of D1-D3, which shows that the conductive properties of the PET composite material of the application are better.

[0104] The physical properties of P1-P5 are better than those of D1-D3, which shows that the physical properties of the PET composite material of the application are better.

[0105] The technical features of the above-described examples can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above-described examples are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0106] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but should not be understood as a limitation on the scope of the application. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which are within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An electrically conductive PET composite material, characterized by: It is made of the following components by weight parts: PET 92-102, Conductive filler 12-16, Antioxidant 0.1-0.5 parts; The conductive filler is a dopamine modified fullerene / N-(β-aminoethyl)-γ-aminopropyl methyl-dimethoxysilane modified tin oxide type conductive filler; The preparation method of the conductive filler is as follows: S1, dopamine hydrochloride, Tris buffer solution, fullerene, ethanol, deionized water are placed in a reaction vessel and mixed uniformly, then placed in a temperature of 60-80℃ for 8-12h, the reaction liquid is filtered to obtain solid, the solid is washed and placed in a vacuum drying oven at 70-80℃ for 6-10h, dopamine modified fullerene is obtained; S2, tin chloride, ammonia, ethanol, deionized water are placed in a reaction vessel and mixed uniformly, then placed in a temperature of 50-70℃ for 10-12h, the reaction liquid is filtered to obtain solid, the solid is washed and placed in a vacuum drying oven at 60-80℃ for 12-16h, solid A is obtained; S3, solid A is placed in a muffle furnace at 720-760℃ for 20-24h to obtain tin oxide; S4, tin oxide, N-(β-aminoethyl)-γ-aminopropyl methyl-dimethoxysilane, ethanol, deionized water are placed in a reaction vessel and mixed uniformly, then placed in a temperature of 40-50℃ for 12-14h, the reaction liquid is filtered to obtain solid, the solid is washed and placed in a vacuum drying oven at 50-70℃ for 8-16h, N-(β-aminoethyl)-γ-aminopropyl methyl-dimethoxysilane modified tin oxide is obtained; S5, dopamine modified fullerene, N-(β-aminoethyl)-γ-aminopropyl methyl-dimethoxysilane modified tin oxide, ethanol, deionized water are placed in a reaction vessel and mixed uniformly, then placed in a temperature of 30-50℃ for 6-10h, the reaction liquid is filtered to obtain solid, the solid is washed and placed in a vacuum drying oven at 60-70℃ for 8-12h, the conductive filler of dopamine modified fullerene / N-(β-aminoethyl)-γ-aminopropyl methyl-dimethoxysilane modified tin oxide type is obtained.

2. The conductive PET composite of claim 1, wherein: The mass ratio of dopamine hydrochloride, Tris buffer solution, fullerene, ethanol, deionized water in S1 step is (16-20):(24-30):(40-50):(60-80):(80-120).

3. The conductive PET composite of claim 1, wherein: The mass ratio of tin chloride, ammonia, ethanol, deionized water in S2 step is (20-30):(24-30):(50-60):(70-80).

4. The conductive PET composite of claim 1, wherein: The mass ratio of tin oxide, N-(β-aminoethyl)-γ-aminopropyl methyl-dimethoxysilane, ethanol, deionized water in S4 step is (24-30):(8-12):(60-70):(80-90).

5. The conductive PET composite of claim 1, wherein: The mass ratio of dopamine modified fullerene, N-(β-aminoethyl)-γ-aminopropyl methyl-dimethoxysilane modified tin oxide, ethanol, deionized water in S5 step is (26-30):(28-32):(50-56):(70-80).

6. The electrically conductive PET composite of claim 1, wherein: The antioxidant is at least one of tris (2, 4-di-tert-butyl) phenyl phosphite, tetra [beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, 1, 3, 5-trimethyl-2, 4, 6- (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene.

7. The method of making a conductive PET composite according to any one of claims 1 to 6, wherein: The method comprises the following steps: (1) 92-102 parts of PET, 12-16 parts of conductive filler and 0.1-0.5 parts of antioxidant are weighed and uniformly mixed to obtain a mixture; (2) The mixture obtained in step (1) is extruded and granulated from a double-screw extruder to obtain a conductive PET composite material.

8. The method of claim 7, wherein: The double-screw extruder comprises six temperature zones arranged in sequence, and the temperatures of the zones are as follows: the temperature of the first zone is 240-260 DEG C, the temperature of the second zone is 280-300 DEG C, the temperature of the third zone is 280-300 DEG C, the temperature of the fourth zone is 280-300 DEG C, the temperature of the fifth zone is 280-300 DEG C, and the temperature of the sixth zone is 280-300 DEG C; the temperature of the head of the double-screw extruder is 280-300 DEG C, and the rotation speed of the screw is 200-280 r / min.

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