High flow high antibacterial high impact polystyrene composite material and preparation method thereof

Abstract

The application relates to the technical field of high molecules, and particularly discloses a high-flow high-antibacterial high-impact polystyrene composite material and a preparation method thereof. The preparation method specifically comprises the following steps: mixing 5-10 parts of polybutadiene rubber, 75-80 parts of styrene and 13-17 parts of a diluent to prepare a rubber solution with a solution viscosity of 55-75 mPa.s; conveying the rubber solution to four continuous and serial plug flow reactors at a flow rate of 2.8-3.2 kg / h to react with the added auxiliary agents; and removing the volatile matter and granulating the material through a melt pump, while adding 45-50 g / h of an antibacterial agent on the side of the extruder to prepare the high-flow high-antibacterial high-impact polystyrene composite material. The high-flow high-antibacterial high-impact polystyrene composite material provided by the application has performance indexes of a melt index of 10-12 g / 10 min, a cantilever beam impact strength of greater than or equal to 120 J / m and a bacterial resistance index of greater than or equal to 99 / %.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high polymers, and specifically discloses a high-flow high-antibacterial high-impact polystyrene composite material and a preparation method thereof. BACKGROUND

[0002] High-impact polystyrene (HIPS) has the characteristics of oil resistance, water resistance and low-temperature resistance, and is suitable in price, and is increasingly valued in the production of refrigerator inner tanks and accessories. During use, when food is spoiled or the refrigerator is not cleaned for a long time, bacteria will breed on the refrigerator shelves, inner tanks and other parts, and there is a risk of infection when people touch them, which threatens the health of the human body. Therefore, whether the refrigerator product has antibacterial properties has become one of the focuses of consumers. In addition, the internal structure of the refrigerator is complex, so in addition to the requirement of antibacterial properties, the material also needs to have high flowability and high impact resistance. The better the flowability and impact resistance, the better the injection molding requirements of the refrigerator shelves, inner tanks and other components. SUMMARY

[0003] The technical solution adopted by the present application is as follows:

[0004] In a first aspect, the present application provides a preparation method of a high-flow high-antibacterial high-impact polystyrene composite material, which specifically comprises the following steps:

[0005] S1: mixing 5-10 parts by mass of polybutadiene rubber, 75-80 parts by mass of styrene and 13-17 parts by mass of diluent to prepare a rubber solution with a solution viscosity of 55-75 mPa.s; the polybutadiene rubber has a linear structure and a Mooney viscosity [ML(1+4)100℃] of 30-55;

[0006] S2: conveying the rubber solution to four continuous and serial plug flow reactors at a flow rate of 2.8-3.2 kg / h for reaction with the added additives;

[0007] At the inlet of the first plug flow reactor, the following additives are added: 1.1 di-tert-butyl peroxide cyclohexane ethylbenzene solution with a mass concentration of 1-2% and an addition amount of 40-45 g / h; n-dodecyl mercaptan ethylbenzene solution or tert-dodecyl mercaptan ethylbenzene solution with a concentration of 2-3% and an addition amount of 60-70 g / h;

[0008] At the pipeline between the first and second plug flow reactors, the following additives are added: n-dodecyl mercaptan ethylbenzene solution or tert-dodecyl mercaptan ethylbenzene solution with a concentration of 2.5-3% and an addition amount of 100-150 g / h;

[0009] At the pipeline between the second and third plug flow reactors, the following additives are added: mineral oil ethylbenzene solution with a concentration of 1-1.5% and an addition amount of 40-45 g / h;

[0010] An auxiliary agent is added at the inter-pipeline between the third and fourth plug flow reactors, which is ethylbenzene solution, and the addition amount is 50-100 g / h;

[0011] The four continuous plug flow reactors each have three temperature zones, and a total of twelve zones, and the temperature of each zone is controlled individually, and the polymerization temperature zones of the four reactors are 105-170℃, and the stirring speed zones of the four reactors are 1-35 rpm;

[0012] S3: After the material passes through the fourth plug flow reactor, the material is transported to an extruder with a vacuum device at a flow rate of 4.5-5.0 kg / h by a melt pump for devolatilization and granulation, and the vacuum degree of the extruder is not higher than -0.1 MPa, and 45-50 g / h of an antibacterial agent is added to the side feeding of the extruder, and a high-flow high-antibacterial high-impact polystyrene composite material is prepared;

[0013] The antibacterial agent includes at least one of a zirconium silver phosphate antibacterial agent, a zinc ion antibacterial agent, and a nano silver zinc compound antibacterial agent.

[0014] Preferably, the reaction temperature of the three reaction zones of the first plug flow reactor is 105, 107, and 112℃, and the reactor speed is 30-35 rpm.

[0015] Preferably, in the three reaction zones of the second plug flow reactor, the reaction temperature is controlled to be 118, 121, and 126℃, and the reactor speed is 30-35 rpm.

[0016] Preferably, in the three reaction zones of the third plug flow reactor, the reaction temperature is controlled to be 128, 135, and 144℃, and the reactor speed is 10-15 rpm.

[0017] Preferably, in the three reaction zones of the fourth plug flow reactor, the reaction temperature is controlled to be 152, 161, and 170℃, and the reactor speed is 1-3 rpm.

[0018] Preferably, the extruder is provided with 7 temperature sections, and from front to back, they are 195, 205, 210, 215, 225, 225, and 220℃, respectively.

[0019] Further, the speed of the extruder is 150-250 rpm.

[0020] Preferably, in the aid, the concentration of 1.1 di-tert-butyl peroxide cyclohexane ethylbenzene solution at the inlet of the first plug flow reactor is 1.6%; the concentration of n-dodecyl mercaptan ethylbenzene solution or tert-dodecyl mercaptan ethylbenzene solution at the inlet of the first plug flow reactor is 2.4%; the concentration of n-dodecyl mercaptan ethylbenzene solution or tert-dodecyl mercaptan ethylbenzene solution at the pipeline between the first and second plug flow reactors is 2.85%; the concentration of mineral oil ethylbenzene solution at the pipeline between the second and third plug flow reactors is 1.2%.

[0021] In a second aspect, the present application provides a high-flow high-antibacterial high-impact polystyrene composite material prepared by the method of the first aspect.

[0022] Preferably, the high-flow high-antibacterial high-impact polystyrene composite material has a melt index of 10-12 g / 10 min, a cantilever beam impact strength of ≥120 J / m, and a bacterial resistance index of ≥99 / %.

[0023] The present application has the following beneficial effects:

[0024] The present application uses continuous bulk polymerization technology to adjust the rubbery Mooney viscosity, the aid ratio, and other means to control the rubber particle size and polymer molecular weight, and to adjust the type of antibacterial agent, so as to ensure that the polystyrene has high antibacterial property while achieving the optimal balance of flowability and impact strength. The high-flow high-antibacterial high-impact polystyrene composite material provided by the present application has a melt index of 10-12 g / 10 min, a cantilever beam impact strength of ≥120 J / m, and a bacterial resistance index of ≥99 / %. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application clearer and more explicit, the present application will be further described in detail in conjunction with the following examples. It should be noted that the present application is not limited to the following examples.

[0026] Example 1

[0027] Table 1: Rubber solution formulation of Example 1

[0028] (1) Rubber with a Mooney viscosity of 30-40, styrene, and ethylbenzene are mixed according to the above rubber solution formulation to prepare a rubber solution, and the solution viscosity is 55 mPa.s.

[0029] (2) The dissolved rubber solution, 1.1 di-tert-butyl peroxide cyclohexane solution with a concentration of 1.6% in ethylbenzene, and n-dodecyl mercaptan solution with a concentration of 2.4% in ethylbenzene are respectively delivered to the inlet of the first plug flow reactor at a flow rate of 2.9 kg / h, 40 g / h, and 60 g / h. The reaction temperature of the three reaction zones of the first reactor is controlled at 105, 107, and 112°C, respectively. The rotation speed of the reactor is 30 rpm. The material passes through the first plug flow reactor and enters the second plug flow reactor.

[0030] (3) The n-dodecyl mercaptan solution with a concentration of 2.85% in ethylbenzene is added to the pipeline of the first and second plug flow reactors at a flow rate of 100 g / h. In the three reaction zones of the second plug flow reactor, the reaction temperature is controlled at 118, 121, and 126°C, respectively. The rotation speed of the reactor is 30 rpm. The material passes through the second plug flow reactor and enters the third plug flow reactor.

[0031] (4) The mineral oil solution with a concentration of 1.2% in ethylbenzene is added to the pipeline of the second and third plug flow reactors at a flow rate of 40 g / h. In the three reaction zones of the third plug flow reactor, the reaction temperature is controlled at 128, 135, and 144°C, respectively. The rotation speed of the reactor is 15 rpm. The material passes through the third plug flow reactor and enters the fourth plug flow reactor.

[0032] (5) The ethylbenzene solution is added to the pipeline of the third and fourth reactors at a flow rate of 50 g / h. In the three reaction zones of the fourth plug flow reactor, the reaction temperature is controlled at 152, 161, and 170°C, respectively. The rotation speed of the reactor is 3 rpm. After passing through the fourth plug flow reactor, the conversion rate of styrene is measured to be 85%. The material is then delivered to the extruder with a vacuum device (vacuum degree: -0.1 MPa) at a flow rate of 4.8 kg / h for devolatilization and granulation. The extruder with the vacuum device has a total of 7 temperature zones, which are 195, 205, 210, 215, 225, 225, and 220°C from front to back, respectively. At 200 rpm, the zirconium phosphate silver antibacterial agent is added to the side feed of the extruder at a flow rate of 48 g / h, thereby obtaining a high-flow, high-antibacterial, and high-impact polystyrene composite material.

[0033] Example 2

[0034] Table 2: Rubber solution formulation of Example 2

[0035] (1) The rubber (Mooney viscosity of 45-55), styrene, and ethylbenzene are mixed according to the above rubber solution formulation to prepare a rubber solution, and the solution viscosity is 75 mPa.s.

[0036] (2) The dissolved rubber solution, 1.1 di-tert-butyl peroxide cyclohexane solution with a concentration of 1.6% in ethylbenzene, and tert-dodecyl mercaptan solution with a concentration of 2.4% in ethylbenzene are respectively delivered to the inlet of the first plug flow reactor at a flow rate of 2.9 kg / h, 45 g / h, and 70 g / h. The reaction temperature of the three reaction zones of the first reactor is controlled at 105, 107, and 112°C, respectively. The rotation speed of the reactor is 35 rpm. The material passes through the first plug flow reactor and enters the second plug flow reactor.

[0037] (3) The tert-dodecyl mercaptan solution with a concentration of 2.85% in ethylbenzene is added to the pipeline of the first and second reactors at a flow rate of 150 g / h. In the three reaction zones of the second plug flow reactor, the reaction temperature is controlled at 118, 121, and 126°C, respectively. The rotation speed of the reactor is 35 rpm. The material passes through the second plug flow reactor and enters the third plug flow reactor.

[0038] (4) The mineral oil solution with a concentration of 1.2% in ethylbenzene is added to the pipeline of the second and third reactors at a flow rate of 45 g / h. In the three reaction zones of the third plug flow reactor, the reaction temperature is controlled at 128, 135, and 144°C, respectively. The rotation speed of the reactor is 10 rpm. The material passes through the third plug flow reactor and enters the fourth plug flow reactor.

[0039] (5) The ethylbenzene solution is added to the pipeline of the third and fourth reactors at a flow rate of 100 g / h. In the three reaction zones of the fourth plug flow reactor, the reaction temperature is controlled at 152, 161, and 170°C, respectively. The rotation speed of the reactor is 1 rpm. After passing through the fourth plug flow reactor, the conversion rate of styrene is measured to be 89.5%. The material is then delivered to the extruder with a vacuum device (vacuum degree: -0.1 MPa) at a flow rate of 4.8 kg / h for devolatilization and granulation. The extruder with the vacuum device has a total of 7 temperature zones, which are 195, 205, 210, 215, 225, 225, and 220°C from front to back, respectively. At 200 rpm, the nanosilver-zinc compound antibacterial agent is added to the side feed of the extruder at a flow rate of 48 g / h, thereby preparing a high-flow, high-antibacterial, and high-impact polystyrene composite material.

[0040] Example 3

[0041] Table 3: Rubber solution formulation of Example 3

[0042]

[0043] (1) The rubber (Mooney viscosity: 35-45), styrene, and ethylbenzene are mixed according to the above rubber solution formulation to prepare a rubber solution with a solution viscosity of 62 mPa.s.

[0044] (2) The dissolved rubber solution, 1.1 di-tert-butyl peroxide cyclohexane ethylbenzene solution with a concentration of 1.6%, and tert-dodecyl mercaptan ethylbenzene solution with a concentration of 2.4% are respectively delivered to the first plug flow reactor inlet at a flow rate of 2.9 kg / h, 42 g / h, and 65 g / h. The reaction temperature of the three reaction zones of the first reactor is controlled at 105, 107, and 112°C, and the rotation speed of the reactor is 32 rpm. The material passes through the first plug flow reactor and enters the second plug flow reactor.

[0045] (3) The tert-dodecyl mercaptan ethylbenzene solution with a concentration of 2.85% is added to the pipelines of the first and second reactors at a flow rate of 125 g / h. In the three reaction zones of the second plug flow reactor, the reaction temperature is controlled at 118, 121, and 126°C, and the rotation speed of the reactor is 32 rpm. The material passes through the second plug flow reactor and enters the third plug flow reactor.

[0046] (4) The mineral oil ethylbenzene solution with a concentration of 1.2% is added to the pipelines of the second and third reactors at a flow rate of 42 g / h. In the three reaction zones of the third plug flow reactor, the reaction temperature is controlled at 128, 135, and 144°C, and the rotation speed of the reactor is 10 rpm. The material passes through the third plug flow reactor and enters the fourth plug flow reactor.

[0047] (5) The ethylbenzene solution is added to the pipelines of the third and fourth reactors at a flow rate of 75 g / h. In the three reaction zones of the fourth plug flow reactor, the reaction temperature is controlled at 152, 161, and 170°C, and the rotation speed of the reactor is 1.5 rpm. After the material passes through the fourth plug flow reactor, the conversion rate of styrene is measured to be 86.2%. The material is then delivered to the extruder with a vacuum device (vacuum degree: -0.1 MPa) at a flow rate of 4.8 kg / h for devolatilization and granulation. The extruder with the vacuum device has a total of 7 temperature zones, which are 195, 205, 210, 215, 225, 225, and 220°C from front to back. At 200 rpm, the zinc ion antibacterial agent is added to the side feed of the extruder at a flow rate of 48 g / h, thereby obtaining the high-flow high-antibacterial high-impact polystyrene composite material.

[0048] Comparative Example 1

[0049] Table 4: Rubber solution formula of Comparative Example 1

[0050]

[0051]

[0052] (1) The rubber (Mooney viscosity: 55-65), styrene, and ethylbenzene are mixed according to the above rubber solution formula to prepare a rubber solution, and the solution viscosity is 83 mPa.s.

[0053] (2) The dissolved rubber solution, 1.1 di-tert-butyl peroxide cyclohexane ethylbenzene solution with a concentration of 1.6%, and tert-dodecyl mercaptan ethylbenzene solution with a concentration of 2.4% are respectively transported to the first plug flow reactor inlet at a flow rate of 2.9 kg / h, 55 g / h, and 80 g / h. The reaction temperature of the three reaction zones of the first reactor is controlled at 105, 107, and 112°C, and the rotation speed of the reactor is 35 rpm. The material passes through the first plug flow reactor and enters the second plug flow reactor.

[0054] (3) The tert-dodecyl mercaptan ethylbenzene solution with a concentration of 2.85% is added to the pipelines of the first and second reactors at a flow rate of 75 g / h. In the three reaction zones of the second plug flow reactor, the reaction temperature is controlled at 118, 121, and 126°C, and the rotation speed of the reactor is 35 rpm. The material passes through the second plug flow reactor and enters the third plug flow reactor.

[0055] (4) The mineral oil ethylbenzene solution with a concentration of 1.2% is added to the pipelines of the second and third reactors at a flow rate of 10 g / h. In the three reaction zones of the third plug flow reactor, the reaction temperature is controlled at 128, 135, and 144°C, and the rotation speed of the reactor is 10 rpm. The material passes through the third plug flow reactor and enters the fourth plug flow reactor.

[0056] (5) The ethylbenzene solution is added to the pipeline between the third and fourth reactors at a flow rate of 150 g / h. In the three reaction zones of the fourth plug flow reactor, the reaction temperature is controlled at 152, 161, and 170°C, and the rotation speed of the reactor is 1 rpm. After the material passes through the fourth plug flow reactor, the conversion rate of styrene is measured to be 85.4%. The material is then transported to the extruder with a vacuum device (vacuum degree is -0.1 MPa) at a flow rate of 4.8 kg / h for devolatilization and granulation. The extruder with the vacuum device has a total of 7 temperature stages, from front to back, which are 195, 205, 210, 215, 225, 225, and 220°C, respectively. At 200 rpm, zinc ion antibacterial agent is added to the side feed of the extruder at a flow rate of 48 g / h, thereby preparing a high-flow high-antibacterial high-impact polystyrene composite material.

[0057] Comparative Example 2

[0058] Table 5: Rubber solution formulation of Comparative Example 2

[0059]

[0060] (1) The rubber (Mooney viscosity is 55-65), styrene, and ethylbenzene are mixed according to the above rubber solution formulation to prepare a rubber solution, and the solution viscosity is 83 mPa.s.

[0061] (2) The dissolved rubber solution, 1.1 di-tert-butyl peroxide cyclohexane solution with a concentration of 1.6% in ethylbenzene, and n-dodecyl mercaptan solution with a concentration of 2.4% in ethylbenzene were respectively transported to the inlet of the first plug flow reactor at a flow rate of 2.9 kg / h, 55 g / h, and 80 g / h. The reaction temperatures of the three reaction zones of the first reactor were controlled at 105, 107, and 112°C, respectively. The rotation speed of the reactor was 30 rpm. The material passed through the first plug flow reactor and entered the second plug flow reactor.

[0062] (3) The n-dodecyl mercaptan solution with a concentration of 2.85% in ethylbenzene was added to the pipelines of the first and second reactors at a flow rate of 75 g / h. In the three reaction zones of the second plug flow reactor, the reaction temperatures were controlled at 118, 121, and 126°C, respectively. The rotation speed of the reactor was 30 rpm. The material passed through the second plug flow reactor and entered the third plug flow reactor.

[0063] (4) The mineral oil solution with a concentration of 1.2% in ethylbenzene was added to the pipelines of the second and third reactors at a flow rate of 10 g / h. In the three reaction zones of the third plug flow reactor, the reaction temperatures were controlled at 128, 135, and 144°C, respectively. The rotation speed of the reactor was 15 rpm. The material passed through the third plug flow reactor and entered the fourth plug flow reactor.

[0064] (5) The ethylbenzene solution was added to the pipelines of the third and fourth reactors at a flow rate of 150 g / h. In the three reaction zones of the fourth plug flow reactor, the reaction temperatures were controlled at 152, 161, and 170°C, respectively. The rotation speed of the reactor was 3 rpm. After passing through the fourth plug flow reactor, the conversion rate of styrene was measured to be 82.1%. Then, the material was transported to the extruder with a vacuum device (vacuum degree: -0.1 MPa) at a flow rate of 4.8 kg / h for devolatilization and granulation. The extruder with the vacuum device had a total of 7 temperature zones, which were 195, 205, 210, 215, 225, 225, and 220°C from front to back, respectively. At 200 rpm, the quaternary ammonium salt organic cation antibacterial agent was added to the side feed of the extruder at a flow rate of 48 g / h, thereby obtaining a high-flow high-antibacterial high-impact polystyrene composite material.

[0065] Test results

[0066] The samples of Examples 1-3 and Comparative Examples 1-2 were subjected to performance testing, and the results are shown in Table 6:

[0067] The Izod impact strength was tested according to ASTM D256-2010.

[0068] Melt flow rate (MFR) test: The melt index was tested by a melt indexer according to GB / T 3682.1-2018, and the test conditions were 200°C and 5 kg.

[0069] Antibacterial property test: the prepared antibacterial HIPS material is subjected to antibacterial property test according to the test method specified in Chinese Light Industry Standard QB / T 2591-2003 "Antibacterial Plastic-Antibacterial Property Test Method and Antibacterial Effect".

[0070] Table 6 Structure and performance index analysis

[0071]

[0072] The above only describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A process for the preparation of a high flow high antibacterial high impact polystyrene composite material, characterized in that, Specifically comprising the following steps: S1: mixing 5-10 parts by mass of polybutadiene rubber, 75-80 parts by mass of styrene, and 13-17 parts by mass of diluent to prepare a rubber solution with a solution viscosity of 55-75 mPa.s; the polybutadiene rubber has a linear structure and a Mooney viscosity (ML (1+4) 100℃) of 30-55; S2: conveying the rubber solution to four continuous and serial plug flow reactors at a flow rate of 2.8-3.2 kg / h for reaction with the added auxiliary agents; At the inlet of the first plug flow reactor, the following auxiliary agent is added: 1,1-di-tert-butyl peroxide cyclohexane ethylbenzene solution with a mass concentration of 1-2% and an addition amount of 40-45 g / h; n-dodecyl mercaptan ethylbenzene solution or tert-dodecyl mercaptan ethylbenzene solution with a concentration of 2-3% and an addition amount of 60-70 g / h; At the pipeline between the first and second plug flow reactors, the following auxiliary agent is added: n-dodecyl mercaptan ethylbenzene solution or tert-dodecyl mercaptan ethylbenzene solution with a concentration of 2.5-3% and an addition amount of 100-150 g / h; At the pipeline between the second and third plug flow reactors, the following auxiliary agent is added: mineral oil ethylbenzene solution with a concentration of 1-1.5% and an addition amount of 40-45 g / h; At the pipeline between the third and fourth plug flow reactors, the following auxiliary agent is added: ethylbenzene solution with an addition amount of 50-100 g / h; The four continuous plug flow reactors each have three temperature zones, a total of twelve zones, and the temperature of each zone is controlled independently; the polymerization temperature of the four reactors ranges from 105 to 170℃, and the stirring speed of the four reactors ranges from 1 to 35 rpm; S3: After the material passes through the fourth plug flow reactor, the material is conveyed to an extruder with a vacuum device at a flow rate of 4.5-5.0 kg / h for devolatilization and granulation; the vacuum degree of the extruder is -0.1 MPa, and 45-50 g / h of antibacterial agent is added to the side feeding of the extruder to prepare a high-flow high-antibacterial high-impact polystyrene composite material. The antibacterial agent includes at least one of a zirconium phosphate silver antibacterial agent, a zinc ion antibacterial agent, and a nano-silver zinc compound antibacterial agent.

2. The process for the preparation of high flow high antibacterial high impact grade polystyrene composite as claimed in claim 1, wherein, The reaction temperature of the three reaction zones of the first plug flow reactor is 105, 107, and 112℃, and the rotation speed of the reactor is 30-35 rpm.

3. The process for the preparation of high flow high antibacterial high impact grade polystyrene composite as claimed in claim 1, wherein, In the second plug flow reactor, the reaction temperature is controlled at 118, 121, and 126℃, and the rotation speed of the reactor is 30-35 rpm.

4. The process for the preparation of high flow high antibacterial high impact grade polystyrene composite as claimed in claim 1, wherein, In the third plug flow reactor, the reaction temperature is controlled at 128, 135, and 144℃, and the rotation speed of the reactor is 10-15 rpm.

5. The process for the preparation of high flow high antibacterial high impact grade polystyrene composite as claimed in claim 1, wherein, In the fourth plug flow reactor, the reaction temperature is controlled at 152, 161, and 170℃, and the rotation speed of the reactor is 1-3 rpm.

6. The process for the preparation of high flow high antibacterial high impact grade polystyrene composite as claimed in claim 1, wherein, The extruder is provided with seven temperature sections, and the temperatures from front to back are 195, 205, 210, 215, 225, 225, and 220℃, respectively.

7. The process for the preparation of high flow high antibacterial high impact polystyrene composite as claimed in claim 6 wherein, The rotation speed of the extruder is 150-250 rpm.

8. The process for the preparation of high flow high antibacterial high impact grade polystyrene composite as claimed in claim 1, wherein, The concentration of 1,1-di-tert-butyl peroxide cyclohexane ethylbenzene solution at the inlet of the first plug flow reactor is 1.6%; the concentration of n-dodecyl mercaptan ethylbenzene solution or tert-dodecyl mercaptan ethylbenzene solution at the inlet of the first plug flow reactor is 2.4%; the concentration of n-dodecyl mercaptan ethylbenzene solution or tert-dodecyl mercaptan ethylbenzene solution at the pipeline between the first and second plug flow reactors is 2.85%; and the concentration of mineral oil ethylbenzene solution at the pipeline between the second and third plug flow reactors is 1.2%.

9. A high flow, high antibacterial, high impact polystyrene composite, characterized in that, The preparation method is prepared by any one of claims 1-8.

10. The high flow high antibacterial high impact polystyrene composite material according to claim 9, characterized in that, The high-flow high-antibacterial high-impact polystyrene composite material has a melt index of 10-12 g / 10 min, a cantilever beam impact strength of greater than or equal to 120 J / m, and a bacterial resistance index of greater than or equal to 99 / %.

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