CN117165042A - Antibacterial PBT composite material and preparation method thereof - Google Patents

Abstract

The invention discloses an antibacterial PBT composite material and a preparation method thereof. The antibacterial PBT composite material includes the following components: 80-100 parts of PBT, 10-16 parts of modified jute fiber, 2-4 parts of antibacterial agent, and antioxidant 0.1-0.5 parts; the modified jute fiber is obtained by dipping jute fiber in an alkali solution and then washing until neutral; the antibacterial agent is a Mg ²⁺ -ZrO ₂ /AgO-Ag type antibacterial agent, The Ag can effectively separate the photogenerated electron-hole pairs in _ZrO2 and generate ·OH with extremely strong oxidizing ability, which inactivates bacterial spores and improves the antibacterial ability of the material. The antibacterial agent can have a synergistic effect with modified jute fiber to improve the antibacterial ability of composite materials while improving the mechanical properties of the material.

Description

Antibacterial PBT composite material and preparation method thereof

Technical field

The invention belongs to the technical field of polymer materials, and specifically relates to an antibacterial PBT composite material and a preparation method thereof.

Background technique

Polybutylene terephthalate (PBT) is a widely used polymer polyester resin. PBT has the advantages of good fatigue resistance, good heat resistance, excellent dimensional stability, etc., but in some applications Specific application fields have high requirements on the physical properties and antibacterial properties of PBT, which limits the application of PBT composite materials in some specific fields.

At present, the use of conventional antibacterial agents has limited improvement in the antibacterial performance of PBT. In addition, although the use of some antibacterial agents improves the antibacterial performance of PBT, it reduces the physical properties of PBT, resulting in the problem of difficulty in balancing the physical properties and antibacterial properties of PBT. .

Contents of the invention

In response to these shortcomings, the present invention innovatively synthesizes a new type of high-performance antibacterial PBT composite material. This PBT composite material has good physical properties and antibacterial properties, and solves the problem of limited physical properties and antibacterial capabilities of PBT in the existing technology. question

In order to achieve the above objects, the technical solution of the present invention is:

An antibacterial PBT composite material, including the following components:

in:

The modified jute fiber is obtained by dipping jute fiber in an alkali solution at room temperature and then washing until neutral; further, the preparation method of the modified jute fiber is as follows: a single filament with a diameter of 10 -12 μm jute fiber was soaked in a NaOH solution with a mass fraction of 4% for 1 hour, then taken out, washed repeatedly with a 5% dilute hydrochloric acid solution until neutral, and then placed in a blast drying oven and dried at 80°C. After drying to constant weight, the modified jute fiber is obtained; jute fiber contains a large amount of lignin, which causes the fiber to be rough and hard and has poor compatibility with polymers. Soaking in NaOH solution can remove the lignin in the jute fiber and improve the relationship between it and PBT. compatibility.

The antioxidant is at least one of antioxidant 168, antioxidant 1010, and antioxidant 1330.

The preparation method of the antibacterial agent is as follows:

(1) Weigh zirconium nitrate pentahydrate, magnesium dichloride (MgCl ₂ ) solution and solvent, add them to the reaction vessel, react at 100-160°C for 8-12 hours to obtain mixed material A; the zirconium nitrate pentahydrate, magnesium dichloride The mass ratio of solution and solvent is (30-40): (40-50): (180-240); preferably, the solvent is acetone, ethanol or isopropyl alcohol;

(2) After filtering the mixed material A to remove the solvent, the resulting material is washed, calcined, and ground through a 100-mesh sieve to obtain magnesium ion-loaded zirconium dioxide, recorded as Mg ²⁺ -ZrO ₂ ; preferably, The calcination temperature is 600-680°C, and the calcination time is 10-16h;

(3) Weigh Mg ²⁺ -ZrO ₂ , ammonia solution, silver chloride (AgCl), and reducing agent, add them to the reaction vessel, and react at room temperature for 10h-16h to obtain mixed material B; preferably, the solvent It is an acetone solution; the reducing agent is sodium borate (NaBH ₄ ); the mass ratio of the Mg ²⁺ -ZrO ₂ , ammonia solution, silver chloride (AgCl), and sodium borate (NaBH ₄ ) is (30- 50): (160-200): (40-60): (0.2-0.6); the mass fraction of the ammonia solution is 25%.

(4) Filter the mixed material B to obtain a solid material. Wash the solid material in sequence, dry it in a vacuum drying oven at 50-70°C for 6-8 hours, and then grind it through a 100-mesh sieve to obtain Mg ²⁺ -ZrO ₂ /AgO-Ag. Type antibacterial agent.

The preparation method of the antibacterial PBT composite material of the present invention includes the following steps:

(1) Weigh 80-100 parts of PBT, 10-16 parts of modified jute fiber, 2-4 parts of antibacterial agents, and 0.1-0.5 parts of antioxidants, and mix them evenly to obtain a mixture;

(2) The mixture obtained in step (1) is extruded and granulated from a twin-screw extruder to obtain a PBT composite material. Among them: the twin-screw extruder includes six temperature zones arranged in sequence. The temperatures in each temperature zone are: the temperature of the first zone is 200-220°C, the temperature of the second zone is 240-260°C, and the temperature of the third zone is 240-260°C. ℃, the temperature in the fourth zone is 240~260°C, the temperature in the fifth zone is 240~260°C, and the temperature in the sixth zone is 240~260°C; the head temperature of the twin-screw extruder is 240~260°C, and the screw speed is 200~280r/ min.

Compared with the prior art, the present invention has the following beneficial effects:

(1) This patent synthesizes a new type of Mg ²⁺ -ZrO _2/ AgO-Ag antibacterial agent. The antibacterial mechanism of this antibacterial agent is mainly as follows: Because Ag is attached to the surface of the ZrO ₂ material, the photogenerated electrons generated by ZrO ₂ can be transferred to Ag element can effectively separate photogenerated electron-hole pairs. The valence band holes in ZrO ₂ will react with -OH in water molecules to generate ·OH with extremely strong oxidizing ability, which will inactivate bacterial spores and improve the material's durability. Antibacterial ability.

(2) Jute fiber contains a large amount of cannasterols and their derivatives, which are effective natural antibacterial substances. They can hinder the metabolism and physiological activities of microorganisms such as molds, destroy the structure of the bacteria, and have antibacterial effects. This is consistent with the invention of this patent. Antibacterial agents can work synergistically to improve the mechanical properties of materials while improving antibacterial capabilities.

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described more comprehensively below in conjunction with specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the invention belongs. The terminology used herein in the description of the invention is for the purpose of describing specific embodiments only and is not intended to limit the invention.

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

Zirconium nitrate pentahydrate, Shanghai Zhongwei Chemical Co., Ltd.; acetone solution, Jinan Yongrui Chemical Co., Ltd.; magnesium dichloride solution, Shanghai Chaocong Chemical Co., Ltd.; silver chloride, Hubei Xinrunde Chemical Co., Ltd.; sodium borate, Henan Hongzhi Chemical Co., Ltd.; PBT (model 1100-211M), Changchun Engineering Plastics (Jiangsu) Co., Ltd., Taiwan; antioxidant (model Irganox168, Irganox1010, Irganox1330), Ciba Fine Chemicals Co., Ltd., Switzerland; sodium hydroxide, analysis Pure, Tianjin Continental Chemical Reagent Factory; hydrochloric acid, analytical grade, Tianjin Continental Chemical Reagent Factory; jute fiber, Qingdao Jinlingwo International Trading Co., Ltd.

In addition, unless otherwise specified, the preparation processes in the following examples are all conventional means in the prior art in this field, and therefore will not be described in detail; the parts in the following embodiments all refer to parts by weight.

Preparation Example 1

(1) Weigh 300g zirconium nitrate pentahydrate, 400g magnesium dichloride solution, and 1.8kg acetone solution, add them to the reaction vessel, and react at 100°C for 8 hours to obtain mixed material A;

(2) After filtering the mixed material A to remove the solvent, the resulting material is washed in sequence, calcined in a muffle furnace at 600°C for 10 hours, and ground through a 100-mesh sieve to obtain zirconium dioxide loaded with magnesium ions, recorded as Mg ²⁺ -ZrO ₂ ;

(3) Weigh 300gMg ²⁺ -ZrO ₂ , 1.6kg ammonia solution with a mass fraction of 25%, 400g silver chloride (AgCl), and 2g sodium borate (NaBH ₄ ), add them to the reaction vessel, and react at room temperature. 10h, mixed material B is obtained;

(4) Filter the mixed material B to obtain a solid material. Wash the solid material in sequence, dry it in a vacuum drying oven at 50°C for 6 hours, and then grind it through a 100-mesh sieve to obtain Mg ²⁺ -ZrO ₂ /AgO-Ag type antibacterial agent N1. .

Application example 1

(1) Weigh 80 parts of PBT, 10 parts of modified jute fiber, 2 parts of antibacterial agent N1, and 0.1 part of antioxidant 1010, mix and stir evenly to obtain a mixture; wherein, the preparation method of modified jute fiber is as follows: Jute fiber with a diameter of 10 μm was soaked in a NaOH solution with a mass fraction of 4%. After 1 hour, the fiber was taken out of the solution, washed repeatedly with a 5% mass fraction of dilute hydrochloric acid solution, and then placed in a blast drying oven. Dry at 80℃ to constant weight;

(2) The mixture obtained in step (1) is extruded and granulated from the extruder to obtain a PBT composite material, which is recorded as P1. Among them, the temperature and screw speed of each zone of the twin-screw extruder are: the temperature of the first zone is 200°C, the temperature of the second zone is 240°C, the temperature of the third zone is 240°C, the temperature of the fourth zone is 240°C, the temperature of the fifth zone is 240°C, and the temperature of the sixth zone is 240°C. , the machine head temperature is 240℃, and the screw speed is 200r/min.

Preparation Example 2

(1) Weigh 400g zirconium nitrate pentahydrate, 500g magnesium dichloride solution, and 2.4kg acetone solution, add them to the reaction vessel, and react at 160°C for 12 hours to obtain mixed material A;

(2) After filtering the mixed material A to remove the solvent, the resulting material was washed in sequence, calcined in a muffle furnace at 680°C for 16 hours, and ground through a 100-mesh sieve to obtain zirconium dioxide loaded with magnesium ions, recorded as Mg ²⁺ -ZrO ₂ ;

(3) Weigh 500g Mg ²⁺ -ZrO ₂ , 2.0kg ammonia solution with a mass fraction of 25%, 600g silver chloride (AgCl), and 6g sodium borate (NaBH ₄ ), and add them to the reaction vessel at room temperature. React for 16 hours to obtain mixed material B;

(4) Filter the mixed material B to obtain a solid material. Wash the solid material in sequence, dry it in a vacuum drying oven at 70°C for 8 hours, and then grind it through a 100-mesh sieve to obtain Mg ²⁺ -ZrO ₂ /AgO-Ag type antibacterial agent N2. .

Application example 2

(1) Weigh 100 parts of PBT, 16 parts of modified jute fiber, 4 parts of antibacterial agent N2, 0.1 part of antioxidant 1010, 0.2 part of antioxidant 168, 0.2 part of antioxidant 1330, mix and stir evenly to obtain a mixture Material; wherein, the preparation method of modified jute fiber is: soak jute fiber with a single filament diameter of 12 μm in a NaOH solution with a mass fraction of 4%. After 1 hour, take the fiber out of the solution and dilute it with 5% mass fraction. After repeated washing with the hydrochloric acid solution, it becomes neutral and then placed in a blast drying oven and dried at 80°C until it reaches constant weight;

(2) The mixture obtained in step (1) is extruded and granulated from the extruder to obtain a PBT composite material, which is marked as P2. Among them, the temperature and screw speed of each zone of the twin-screw extruder are: the temperature of the first zone is 220°C, the temperature of the second zone is 260°C, the temperature of the third zone is 260°C, the temperature of the fourth zone is 260°C, the temperature of the fifth zone is 260°C, and the temperature of the sixth zone is 260°C. , the machine head temperature is 260℃, and the screw speed is 280r/min.

Preparation Example 3

(1) Weigh 350g zirconium nitrate pentahydrate, 450g magnesium dichloride solution, and 2.1kg acetone solution, add them to the reaction vessel, and react at 130°C for 10 hours to obtain mixed material A;

(2) After filtering the mixed material A to remove the solvent, the resulting material was washed in sequence, calcined in a muffle furnace at 640°C for 13 hours, and ground through a 100-mesh sieve to obtain zirconium dioxide loaded with magnesium ions, recorded as Mg ²⁺ -ZrO ₂ ;

(3) Weigh 400g Mg ²⁺ -ZrO ₂ , 1.8kg ammonia solution with a mass fraction of 25%, 500g silver chloride (AgCl), and 4g sodium borate (NaBH ₄ ), and add them to the reaction vessel at room temperature. React for 13 hours to obtain mixed material B;

(4) Filter the mixed material B to obtain a solid material. Wash the solid material in sequence, dry it in a vacuum drying oven at 60°C for 7 hours, and then grind it through a 100-mesh sieve to obtain Mg ²⁺ -ZrO ₂ /AgO-Ag type antibacterial agent N3. .

Application example 3

(1) Weigh 90 parts of PBT, 13 parts of modified jute fiber, 3 parts of antibacterial agent N3, 0.1 part of antioxidant 168, 0.2 part of antioxidant 1010, mix and stir evenly to obtain a mixture; among them, modified jute The fiber preparation method is as follows: soak jute fiber with a single filament diameter of 11 μm in a NaOH solution with a mass fraction of 4%. After 1 hour, the fiber is taken out of the solution and washed repeatedly with a 5% mass fraction of dilute hydrochloric acid solution until it becomes neutral. Then put it into a blast drying oven and dry it at 80℃ to constant weight;

(2) The mixture obtained in step (1) is extruded and granulated from the extruder to obtain a PBT composite material, designated as P3. Among them, the temperature and screw speed of each zone of the twin-screw extruder are: the temperature of the first zone is 210°C, the temperature of the second zone is 250°C, the temperature of the third zone is 250°C, the temperature of the fourth zone is 250°C, the temperature of the fifth zone is 250°C, and the temperature of the sixth zone is 250°C. , the machine head temperature is 250℃, and the screw speed is 240r/min.

Preparation Example 4

(1) Weigh 380g zirconium nitrate pentahydrate, 460g magnesium dichloride solution, and 1.9kg acetone solution, add them to the reaction vessel, and react at 140°C for 11 hours to obtain mixed material A;

(2) After filtering the mixed material A to remove the solvent, the resulting material was washed in sequence, calcined in a muffle furnace at 645°C for 15 hours, and ground through a 100-mesh sieve to obtain zirconium dioxide loaded with magnesium ions, recorded as Mg ²⁺ -ZrO ₂ ;

(3) Weigh 420g Mg ²⁺ -ZrO ₂ , 1.9kg ammonia solution with a mass fraction of 25%, 480g silver chloride (AgCl), and 5g sodium borate (NaBH ₄ ), and add them to the reaction vessel at room temperature. React for 12 hours to obtain mixed material B;

(4) Filter the mixed material B to obtain a solid material. Wash the solid material in sequence, dry it in a vacuum drying oven at 55°C for 8 hours, and then grind it through a 100-mesh sieve to obtain Mg ²⁺ -ZrO ₂ /AgO-Ag type antibacterial agent N4. .

Application example 4

(1) Weigh 85 parts of PBT, 15 parts of modified jute fiber, 4 parts of antibacterial agent N4, 0.1 part of antioxidant 1010, 0.2 part of antioxidant 1330, mix and stir evenly to obtain a mixture; among them, modified jute The fiber preparation method is as follows: soak jute fiber with a single filament diameter of 11 μm in a NaOH solution with a mass fraction of 4%. After 1 hour, the fiber is taken out of the solution and washed repeatedly with a 5% mass fraction of dilute hydrochloric acid solution until it becomes neutral. Then put it into a blast drying oven and dry it at 80℃ to constant weight;

(2) The mixture obtained in step (1) is extruded and granulated from the extruder to obtain a PBT composite material, designated as P4. Among them, the temperature and screw speed of each zone of the twin-screw extruder are: the temperature of the first zone is 205°C, the temperature of the second zone is 245°C, the temperature of the third zone is 245°C, the temperature of the fourth zone is 245°C, the temperature of the fifth zone is 245°C, and the temperature of the sixth zone is 245°C. , the machine head temperature is 245℃, and the screw speed is 230r/min.

Preparation Example 5

(1) Weigh 380g zirconium nitrate pentahydrate, 420g magnesium dichloride solution, and 2.2kg acetone solution, add them to the reaction vessel, and react at 145°C for 9 hours to obtain mixed material A;

(2) After filtering the mixed material A to remove the solvent, the resulting material was washed in sequence, calcined in a muffle furnace at 645°C for 15 hours, and ground through a 100-mesh sieve to obtain zirconium dioxide loaded with magnesium ions, recorded as Mg ²⁺ -ZrO ₂ ;

(3) Weigh 380g Mg ²⁺ -ZrO ₂ , 1.9kg ammonia solution with a mass fraction of 25%, 480g silver chloride (AgCl), and 5g sodium borate (NaBH ₄ ), and add them to the reaction vessel at room temperature. React for 11 hours to obtain mixed material B;

(4) Filter the mixed material B to obtain a solid material. Wash the solid material in sequence, dry it in a vacuum drying oven at 55°C for 7 hours, and grind it through a 100-mesh sieve to obtain Mg ²⁺ -ZrO ₂ /AgO-Ag type antibacterial agent N5.

Application example 5

(1) Weigh 95 parts of PBT, 11 parts of modified jute fiber, 2 parts of antibacterial agent N5, 0.1 part of antioxidant 1010, 0.1 part of antioxidant 168, mix and stir evenly to obtain a mixture; among them, modified jute The fiber preparation method is as follows: soak jute fiber with a single filament diameter of 10 μm in a NaOH solution with a mass fraction of 4%. After 1 hour, the fiber is taken out of the solution and washed repeatedly with a 5% mass fraction of dilute hydrochloric acid solution until it becomes neutral. Then put it into a blast drying oven and dry it at 80℃ to constant weight;

(2) The mixture obtained in step (1) is extruded and granulated from the extruder to obtain a PBT composite material, recorded as P5.

Among them, the temperature and screw speed of each zone of the twin-screw extruder are: the temperature of the first zone is 205°C, the temperature of the second zone is 255°C, the temperature of the third zone is 255°C, the temperature of the fourth zone is 255°C, the temperature of the fifth zone is 255°C, and the temperature of the sixth zone is 255°C. The machine head temperature is 255℃, and the screw speed is 245r/min.

Application comparison example 1

(1) Weigh 95 parts of PBT, 0.1 part of antioxidant 1010, and 0.1 part of antioxidant 168, mix and stir evenly to obtain a mixture;

(2) The mixture obtained in step (1) is extruded and granulated from the extruder to obtain a PBT composite material, recorded as D1. Among them, the temperature and screw speed of each zone of the twin-screw extruder are: the temperature of the first zone is 205°C, the temperature of the second zone is 255°C, the temperature of the third zone is 255°C, the temperature of the fourth zone is 255°C, the temperature of the fifth zone is 255°C, and the temperature of the sixth zone is 255°C. , the machine head temperature is 255℃, and the screw speed is 245r/min.

Application comparison example 2

(1) Weigh 95 parts of PBT, 2 parts of antibacterial agent N5, 0.1 part of antioxidant 1010, and 0.1 part of antioxidant 168, mix and stir evenly to obtain a mixture;

(2) The mixture obtained in step (1) is extruded and granulated from the extruder to obtain a PBT composite material, recorded as D2.

Application comparison example 3

(1) Weigh 95 parts of PBT, 11 parts of modified jute fiber, 0.1 part of antioxidant 1010, and 0.1 part of antioxidant 168, mix and stir evenly to obtain a mixture; wherein, the preparation method of modified jute fiber is: Soak jute fiber with a single filament diameter of 11 μm in a NaOH solution with a mass fraction of 4%. After 1 hour, take the fiber out of the solution, wash it repeatedly with a 5% dilute hydrochloric acid solution until it becomes neutral, and put it into air drying. box, dried at 80℃ to constant weight;

(2) The mixture obtained in step (1) is extruded and granulated from the extruder to obtain a PBT composite material, recorded as D3. Among them, the temperature and screw speed of each zone of the twin-screw extruder are: the temperature of the first zone is 205°C, the temperature of the second zone is 255°C, the temperature of the third zone is 255°C, the temperature of the fourth zone is 255°C, the temperature of the fifth zone is 255°C, and the temperature of the sixth zone is 255°C. , the machine head temperature is 255℃, and the screw speed is 245r/min.

The antibacterial rate test of the PBT composite materials prepared in the above Application Examples 1-5 and Comparative Examples 1-3 was conducted in accordance with the standard JISZ 2801, using the specification of (50mm±2mm)×(50mm±2mm)×(6mm±0.1mm) Test piece, test 24 hours after inoculation time.

The tensile strength test was carried out in accordance with the standard ASTM D638. The tensile spline model used was (170.0±5.0)mm*(13.0±0.5)mm*(3.2±0.2)mm, and the tensile rate was 50mm/min;

The notched Izod impact strength is measured in accordance with the standard ASTM D256. The notched Izod impact strength spline model used is: (125.0±5.0)mm*(13.0±0.5)mm*(3.2±0.2)mm. The notch is machined and the notch depth is (2.6±0.2)mm.

The performance data is shown in Table 1 below:

Table 1 Performance test results of PBT composite materials prepared by each application example and application comparison example

It can be seen from the above table that P1-P5 has better physical properties and antibacterial properties than D1, D2, and D3. This shows that the PBT composite material prepared by the method provided by the invention has excellent comprehensive properties and can expand the application of PBT composite materials. field.

The technical features of the above-described embodiments can be combined in any way. To simplify the description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, All should be considered to be within the scope of this manual.

The above-mentioned embodiments only express several implementation modes of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention. For those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims (10)

1. An antibacterial PBT composite material, which is characterized in that: the composition comprises the following components:

the modified jute fiber is obtained by immersing jute fiber in alkali liquor, and then washing to neutrality;

the preparation method of the antibacterial agent comprises the following steps:

(1) Weighing zirconium nitrate pentahydrate, magnesium dichloride solution and solvent, adding into a reaction vessel, and reacting for 8-12h at 100-160 ℃ to obtain a mixed material A;

(2) Filtering the mixed material A to remove the solvent, sequentially washing and calcining the obtained material, and grinding to obtain zirconium dioxide loaded with magnesium ions, which is marked as Mg ²⁺ -ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the The calcining temperature is 600-680 ℃ and the calcining time is 10-16h;

(3) Weighing Mg ²⁺ -ZrO ₂ Adding ammonia water solution, silver chloride and a reducing agent into a reaction vessel, and reacting for 10-16 hours at normal temperature to obtain a mixed material B;

(4) Filtering the mixed material B to obtain a solid material, sequentially washing, drying and grinding the solid material to obtain Mg ^{2 +} -ZrO ₂ An AgO-Ag type antibacterial agent.

2. The antibacterial PBT composite material of claim 1, wherein: in the step (1), the mass ratio of the zirconium nitrate pentahydrate, the magnesium dichloride solution and the solvent is (30-40): (40-50): (180-240); the solvent is acetone, ethanol or isopropanol.

3. The antibacterial PBT composite material of claim 1, wherein: in the step (3), the reducing agent is sodium borate; the Mg is ²⁺ -ZrO ₂ The mass ratio of the ammonia water solution, the silver chloride and the sodium borate is (30-50): (160-200): (40-60): (0.2-0.6); the mass fraction of the ammonia water solution is 25%.

4. The antibacterial PBT composite material of claim 1, wherein: in the step (4), the drying is performed in a vacuum drying oven; the drying temperature is 50-70 ℃ and the drying time is 6-8h.

5. The antibacterial PBT composite material of claim 1, wherein: the preparation method of the modified jute fiber comprises the following steps: and (3) putting the jute fibers into NaOH solution for dipping treatment, taking out, washing to be neutral, and drying to obtain the modified jute fibers.

6. The antibacterial PBT composite material of claim 5, wherein: the monofilament diameter of the jute fiber is 10-12 mu m.

7. The antibacterial PBT composite material of claim 5, wherein: the mass fraction of the NaOH solution is 4%; the time of the dipping treatment was 1h.

8. The antibacterial PBT composite material of claim 1, wherein: the antioxidant is at least one of antioxidant 168, antioxidant 1010 and antioxidant 1330.

9. The method of preparing an antibacterial PBT composite material according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:

(1) Weighing 80-100 parts of PBT, 10-16 parts of modified jute fiber, 2-4 parts of antibacterial agent and 0.1-0.5 part of antioxidant, and uniformly mixing to obtain a mixture;

(2) Extruding and granulating the mixture obtained in the step (1) from a double-screw extruder to obtain the PBT composite material.

10. The method for preparing the antibacterial PBT composite material according to claim 9, wherein: the double-screw extruder comprises six temperature areas which are sequentially arranged, and the temperatures of the temperature areas are as follows: the temperature of the first area is 200-220 ℃, the temperature of the second area is 240-260 ℃, the temperature of the third area is 240-260 ℃, the temperature of the fourth area is 240-260 ℃, the temperature of the fifth area is 240-260 ℃, and the temperature of the sixth area is 240-260 ℃; the temperature of the head of the double-screw extruder is 240-260 ℃, and the rotating speed of the screw is 200-280 r/min.