Conductive carbon black composite material and application thereof in polypropylene plastic

Abstract

The invention discloses a conductive carbon black composite material and application thereof in polypropylene plastic, and aims to solve the problems that carbon black in a traditional conductive carbon black / polypropylene composite material is easy to agglomerate, a dispersing agent is single in function and easy to migrate, polypropylene is easy to degrade and the like. The composite material is prepared by mixing 18-22 parts of conductive carbon black VXC72 and 9-11 parts of a lignin-polyethylene glycol graft at a high speed, wherein the graft is obtained by reacting lignin, polyethylene glycol and the like. And carrying out drying, mixing, extrusion and other processes on the mixture, polypropylene particles and the like in proportion to prepare the polypropylene plastic. The melt flow rate of the product is improved by more than 60%, the retention rate of tensile strength after 1000h of ultraviolet aging exceeds 80%, and when the filling amount of carbon black is 8-10%, the volume resistivity is stabilized at 10-10 omega.cm, the notch impact strength is improved by 40%, the anti-aging life is prolonged by more than two times, and the cost of the auxiliary agent is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of carbon black production, and particularly relates to a conductive carbon black composite material and application thereof in polypropylene plastics. BACKGROUND

[0002] The conductive carbon black / polypropylene (PP) composite material is widely used in the fields of anti-static packaging, electronic device shell, new energy cable sheath, etc. due to its conductivity and easy processability of plastics. However, the performance balance and long-term stability are always the core bottleneck restricting industrialization, and the existing technology has the following outstanding problems: Firstly, the high specific surface area and surface energy of the conductive carbon black lead to its easy agglomeration in the PP matrix, and a dispersant needs to be relied on to improve the dispersibility. Although the traditional dispersant (such as PE wax, zinc stearate) can improve the processing fluidity by reducing the melt viscosity, it has two major limitations: (1) single function: only the physical lubrication is used to improve the processability, and the interface bonding force with the carbon black is weak, and the secondary agglomeration is easy to occur due to the shear force or temperature fluctuation, so that the composite material appears the phenomenon of "qualified dispersion during processing, and performance degradation after molding"; (2) migration failure: the small molecule dispersant is easy to migrate to the surface during the use of the material, which not only loses the dispersion effect, but also causes the surface of the product to be sticky and pollute the contact medium.

[0003] Secondly, the tertiary carbon atoms in the PP molecular chain are easy to be degraded by ultraviolet light and thermal oxygen, and the introduction of the conductive carbon black aggravates this problem, and the residual metal impurities (such as iron and nickel) of the carbon black can catalyze the oxidative degradation of the PP, so that the tensile strength retention rate of the material is usually lower than 60% after 1000h ultraviolet aging.

[0004] The application proposes the hydrogen bond network design of the lignin-PEG graft and the aminated SiO2, which precisely targets the above technical pain points. The lignin-PEG graft is used as an amphiphilic macromolecular dispersant, the PEG segment improves the compatibility with the polymer matrix, and the lignin unit provides rich active sites, and a stable network structure is formed by the hydrogen bond between the lignin unit and the amino group on the surface of the aminated SiO2, which not only enhances the dispersion stability of the filler, but also inhibits the agglomeration of the filler during the processing; at the same time, the unique phenolic hydroxyl structure of the lignin and the amino group on the surface of the SiO2 cooperatively construct a free radical capture system, the former interrupts the free radical chain reaction by hydrogen donation, and the latter neutralizes the acidic free radicals by the aid of the alkaline sites, so that the anti-aging performance is synergistically enhanced. SUMMARY

[0005] The application aims to provide a conductive carbon black composite material and application thereof in polypropylene plastics to solve the problems in the background art.

[0006] The purpose of the application can be achieved by the following technical solutions: A conductive carbon black composite material is prepared by the following steps: The conductive carbon black VXC72 and the lignin-polyethylene glycol graft are added into a high-speed mixer, the rotating speed is set to 3000 r / min, and mixing is performed for 5 min. The carbon black is coated by the adhesion of the lignin-polyethylene glycol graft, and agglomeration is preliminarily inhibited to obtain the conductive carbon black composite material.

[0007] Further, the specific surface area of the conductive carbon black VXC72 is 250 m 2 / g.

[0008] Further, the conductive carbon black composite material comprises the following mass parts of raw materials: The conductive carbon black VXC72 is 18-22 parts, and the lignin-polyethylene glycol graft is 9-11 parts.

[0009] Further, the lignin-polyethylene glycol graft is prepared by the following steps: S1, lignin, polyethylene glycol and p-toluenesulfonic acid are added to anhydrous ethanol, stirred until completely dissolved, heated to 120°C, and reacted at a stirring speed of 300 r / min for 3.5-4.5 hours. After completion, a suspension is obtained, the suspension is poured into deionized water for precipitation, the solid is collected by suction filtration, and after completion, a crude product is obtained; S2, the crude product is washed with deionized water for 2-4 times to remove unreacted polyethylene glycol and p-toluenesulfonic acid, and after completion, vacuum drying is performed at 60°C for 12 hours, grinding through a 100 mesh sieve, and after completion, the lignin-polyethylene glycol graft is obtained.

[0010] Further, the amount ratio of the lignin, polyethylene glycol, p-toluenesulfonic acid, anhydrous ethanol, deionized water in S1 is 60 g: 25-35 g: 0.8-1.2 g: 400 ml: 1000 ml.

[0011] Further, a conductive carbon black composite material and its application in polypropylene plastic, comprising the following steps: T1, polypropylene particles are vacuum dried at 80°C for 2 hours, then amino silica is vacuum dried at 80°C for 4 hours to remove surface adsorbed water and avoid bubbles during processing, then the polypropylene particles and the conductive carbon black composite material are placed into a mixer and stirred at a speed of 800 r / min for 5-10 minutes, then amino silica and antioxidant 1010 are added and continue to be stirred at a speed of 800 r / min for 10-15 minutes to obtain a premix; T2, set the temperature of each section of the twin-screw extruder to: 160℃ for the first zone, 170℃ for the second zone, 180℃ for the third zone, 185℃ for the fourth zone, and 180℃ for the die; after the stability of each region, the premix is added to the hopper of the twin-screw extruder, the feeding rate is controlled to be 2.5-3.5 kg / h, and the melt blending extrusion is carried out at a screw speed of 300 r / min; the extrudate is water-cooled and drawn, and then cut into 2-4 mm long particles by using a granulator; the particles are vacuum dried at 60℃ for 2 hours to obtain polypropylene plastic.

[0012] Further, the polypropylene plastic comprises the following mass parts of raw materials: 70-90 parts of polypropylene particles, 10-20 parts of conductive carbon black composite material, 3-5 parts of aminated silicon dioxide, and 0.5-1.0 parts of antioxidant 1010.

[0013] The beneficial effects of the present application are: In the traditional method, improving the processability (such as adding lubricants) often leads to a decrease in aging resistance due to the migration of additives. The present application solves this contradiction through the hydrogen bond network of lignin-polyethylene glycol graft and aminated silicon dioxide: the melt flow rate is increased by more than 60%, the tensile strength retention rate after 1000h of ultraviolet aging is increased from 55% to more than 80%, the graft serves as a bio-based lubricant to reduce friction and melt viscosity; aminated silicon dioxide promotes its own and carbon black dispersion through hydrogen bonds to avoid agglomeration and blockage, and also enhances the interfacial bonding force with polypropylene to reduce flow resistance.

[0014] By the nucleation effect of aminated silicon dioxide and the interfacial bridging of lignin-polyethylene glycol graft, when the carbon black filling amount is only 8-10%, the volume resistivity is stably maintained at 10 4 ~10 5 Ω·cm (satisfying the conductivity requirement), and the notched impact strength is increased by 40% (reaching 4-4.5kJ / m 2 ), avoiding the mechanical degradation caused by traditional high filling.

[0015] The phenolic hydroxyl groups of lignin (chemically capturing free radicals) and the physical adsorption-ultraviolet blocking of aminated silicon dioxide form a "chemical-physical" double protection, which prolongs the anti-aging life by more than 2 times without the need for additional addition of a large amount of antioxidant (only 0.5-1.0% auxiliary), reducing the cost of additives. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application. Meanwhile, the raw materials, reagents or devices used in the following embodiments are commercially available or can be obtained by known methods, if not otherwise specified.

[0017] Embodiment 1

[0018] Preparation of lignin-polyethylene glycol graft: S1, lignin, polyethylene glycol and p-toluenesulfonic acid are added to anhydrous ethanol, stirred until completely dissolved, heated to 120℃, reacted at a stirring rate of 300r / min for 3.5 hours, after completion, a suspension is obtained, the suspension is poured into deionized water for precipitation, the solid is collected by suction filtration, after completion, a crude product is obtained, wherein the amount ratio of lignin, polyethylene glycol, p-toluenesulfonic acid, anhydrous ethanol, deionized water is 60g:25g:0.8g:400ml:1000ml.

[0019] S2, the crude product is washed with deionized water for 2 times to remove unreacted polyethylene glycol and p-toluenesulfonic acid, after completion, vacuum drying at 60℃ for 12 hours, grinding through a 100 mesh sieve, after completion, a lignin-polyethylene glycol graft is obtained.

[0020] Embodiment 2

[0021] Preparation of lignin-polyethylene glycol graft: S1, lignin, polyethylene glycol and p-toluenesulfonic acid are added to anhydrous ethanol, stirred until completely dissolved, heated to 120℃, reacted at a stirring rate of 300r / min for 4 hours, after completion, a suspension is obtained, the suspension is poured into deionized water for precipitation, the solid is collected by suction filtration, after completion, a crude product is obtained, wherein the amount ratio of lignin, polyethylene glycol, p-toluenesulfonic acid, anhydrous ethanol, deionized water is 60g:30g:1.0g:400ml:1000ml.

[0022] S2, the crude product is washed with deionized water for 3 times to remove unreacted polyethylene glycol and p-toluenesulfonic acid, after completion, vacuum drying at 60℃ for 12 hours, grinding through a 100 mesh sieve, after completion, a lignin-polyethylene glycol graft is obtained.

[0023] Embodiment 3

[0024] Preparation of lignin-polyethylene glycol graft: S1, lignin, polyethylene glycol and p-toluene sulfonic acid were added into anhydrous ethanol, stirred until completely dissolved, heated to 120°C, reacted for 4.5 hours at a stirring rate of 300 r / min, after completion, a suspension was obtained, the suspension was poured into deionized water to precipitate, the solid was collected by suction filtration, after completion, the crude product was obtained, wherein the amount ratio of lignin, polyethylene glycol, p-toluene sulfonic acid, anhydrous ethanol, deionized water was 60 g: 35 g: 1.2 g: 400 ml: 1000 ml.

[0025] S2, the crude product was washed with deionized water for 4 times to remove unreacted polyethylene glycol and p-toluene sulfonic acid, after completion, vacuum dried at 60°C for 12 hours, ground through a 100 mesh sieve, after completion, the lignin-polyethylene glycol grafting product was obtained.

[0026] Example 4

[0027] Preparation of conductive carbon black composite material: Firstly, the conductive carbon black composite material includes the following mass parts of raw materials: conductive carbon black VXC72 (specific surface area 250 m 2 / g) 18 parts, lignin-polyethylene glycol grafting product prepared in Example 1 9 parts.

[0028] Then, the preparation steps of the conductive carbon black composite material are as follows: The conductive carbon black VXC72 and the lignin-polyethylene glycol grafting product were added into a high-speed mixer, the rotating speed was set to 3000 r / min, mixed for 4 min, the carbon black was coated by using the adhesion of the lignin-polyethylene glycol grafting product, the agglomeration was preliminarily inhibited, and the conductive carbon black composite material was obtained.

[0029] Example 5

[0030] Preparation of conductive carbon black composite material: Firstly, the conductive carbon black composite material includes the following mass parts of raw materials: conductive carbon black VXC72 (specific surface area 250 m 2 / g) 20 parts, lignin-polyethylene glycol grafting product prepared in Example 2 10 parts.

[0031] Then, the preparation steps of the conductive carbon black composite material are as follows: The conductive carbon black VXC72 and the lignin-polyethylene glycol grafting product were added into a high-speed mixer, the rotating speed was set to 3000 r / min, mixed for 5 min, the carbon black was coated by using the adhesion of the lignin-polyethylene glycol grafting product, the agglomeration was preliminarily inhibited, and the conductive carbon black composite material was obtained.

[0032] Example 6

[0033] Preparation of conductive carbon black composite material: Firstly, the conductive carbon black composite material comprises the following raw materials by mass fraction: Conductive carbon black VXC72 (specific surface area 250 m 2 / g) 22 parts, and the lignin-polyethylene glycol grafting product prepared in Example 3 11 parts.

[0034] Then, the conductive carbon black composite material is prepared by the following steps: The conductive carbon black VXC72 and the lignin-polyethylene glycol grafting product are added into a high-speed mixer, the rotating speed is set to 3000 r / min, and mixing is performed for 6 min. The carbon black is coated by the adhesion of the lignin-polyethylene glycol grafting product, and agglomeration is preliminarily inhibited, so as to obtain the conductive carbon black composite material.

[0035] Example 7

[0036] The application of the conductive carbon black composite material in the polypropylene plastic comprises the following steps: Firstly, the polypropylene plastic comprises the following raw materials by mass fraction: polypropylene particles 70 parts, the conductive carbon black composite material prepared in Example 4 10 parts, aminosilica 3 parts, and antioxidant 1010 0.5 parts. Then, the polypropylene plastic is prepared by the following steps: T1, the polypropylene particles are vacuum dried at 80℃ for 2 hours, the aminosilica is vacuum dried at 80℃ for 4 hours to remove the surface adsorbed water and avoid the generation of bubbles during processing, the polypropylene particles and the conductive carbon black composite material are put into a mixer and stirred at a speed of 800 r / min for 5 min, and then the aminosilica and the antioxidant 1010 are added and stirred at a speed of 800 r / min for 10 min to obtain a premix; T2, the temperature of each section of the twin-screw extruder is set to: zone 1 160℃, zone 2 170℃, zone 3 180℃, zone 4 185℃, and the die head 180℃. After the stability of each region is ensured, the premix is added into the hopper of the twin-screw extruder, the feeding rate is controlled to be 2.5 kg / h, and the melt blending extrusion is performed at a screw rotating speed of 300 r / min. After the extrudate is water-cooled and drawn, the granulator is used to cut the particles into 2 mm long particles. The particles are vacuum dried at 60℃ for 2 hours to obtain the polypropylene plastic.

[0037] Example 8

[0038] The application of the conductive carbon black composite material in the polypropylene plastic comprises the following steps: Firstly, the polypropylene plastic comprises the following raw materials by mass fraction: polypropylene particles 80 parts, the conductive carbon black composite material prepared in Example 5 15 parts, aminosilica 4 parts, and antioxidant 1010 0.7 parts. Then, the polypropylene plastic is prepared by the following steps: T1, vacuum drying the polypropylene particles at 80℃ for 2 hours, vacuum drying the aminosilica at 80℃ for 4 hours to remove the surface absorbed water to avoid bubbles during processing, then putting the polypropylene particles and the conductive carbon black composite material into a mixer to stir at a speed of 800 r / min for 8 minutes, then adding the aminosilica and the antioxidant 1010 to continue stirring at a speed of 800 r / min for 12 minutes to obtain a premix; T2, setting the temperature of each section of the twin-screw extruder to be: 160℃ for the first section, 170℃ for the second section, 180℃ for the third section, 185℃ for the fourth section, and 180℃ for the die, after the stability of each region, adding the premix into the hopper of the twin-screw extruder, controlling the feeding rate to be 3.0 kg / h, and carrying out melt blending extrusion at a screw speed of 300 r / min, after water cooling and drawing the extrudate, using a pelletizer to cut into 3mm long particles, vacuum drying the particles at 60℃ for 2 hours to obtain the polypropylene plastic.

[0039] Example 9

[0040] The application of the conductive carbon black composite material in the polypropylene plastic includes the following steps: First, the polypropylene plastic includes the following mass parts of raw materials: 90 parts of polypropylene particles, 20 parts of the conductive carbon black composite material prepared in Example 6, 5 parts of aminosilica, and 1.0 parts of antioxidant 1010; Then, the polypropylene plastic is prepared by the following steps: T1, vacuum drying the polypropylene particles at 80℃ for 2 hours, vacuum drying the aminosilica at 80℃ for 4 hours to remove the surface absorbed water to avoid bubbles during processing, then putting the polypropylene particles and the conductive carbon black composite material into a mixer to stir at a speed of 800 r / min for 10 minutes, then adding the aminosilica and the antioxidant 1010 to continue stirring at a speed of 800 r / min for 15 minutes to obtain a premix; T2, setting the temperature of each section of the twin-screw extruder to be: 160℃ for the first section, 170℃ for the second section, 180℃ for the third section, 185℃ for the fourth section, and 180℃ for the die, after the stability of each region, adding the premix into the hopper of the twin-screw extruder, controlling the feeding rate to be 3.5 kg / h, and carrying out melt blending extrusion at a screw speed of 300 r / min, after water cooling and drawing the extrudate, using a pelletizer to cut into 4mm long particles, vacuum drying the particles at 60℃ for 2 hours to obtain the polypropylene plastic.

[0041] Comparative Example 1 Comparative Example 1 is a control group of Example 8, replacing the conductive carbon black composite material prepared in Example 5 in Example 8 with conductive carbon black VXC72 (specific surface area 250 m 2 / g), and the rest of the raw materials, the raw material usage and the preparation steps remain consistent with Example 8, finally obtaining the polypropylene plastic.

[0042] Comparative Example 2 Comparative Example 2 is a control group of Example 8, removing the aminated silicon dioxide in Example 8, and the rest of the raw materials, the raw material usage and the preparation steps remain consistent with Example 8, finally obtaining the polypropylene plastic.

[0043] Comparative Example 3 Comparative Example 3 is a control group of Example 8, replacing the conductive carbon black composite material prepared in Example 5 in Example 8 with conductive carbon black VXC72 (specific surface area 250 m 2 / g), removing the aminated silicon dioxide, and the rest of the raw materials, the raw material usage and the preparation steps remain consistent with Example 8, finally obtaining the polypropylene plastic.

[0044] Performance tests are carried out on Examples 7-9 and Comparative Examples 1-3, and the performance test process is as follows, and the test results are shown in Table 1: Melt flow rate test (ISO 1133) Steps: turn on the melt flow rate instrument, set the temperature to 230℃, and after the temperature is stable, keep it for 30 min, put about 10 g of polypropylene plastic particles into the cylinder with a funnel, insert the piston and gently press it down to the bottom of the sample, and let the sample preheat at 230℃ for 4 min, during which the piston will slowly descend due to the melting of the sample, and this process does not apply additional load. After preheating, place a 2.16 kg load on the top of the piston, at which time the sample begins to extrude through the die. When the piston drops to the "starting mark line" on the cylinder, start the timer and record the time. When the piston drops to the "end mark line", quickly cut off the extrudate with a knife blade, and stop the timer at the same time. Record the extrusion time t, and weigh the mass m of each cut extrudate with a balance.

[0045] Calculation: Melt flow rate (%) = [(m x 600) / t] x 100%.

[0046] Tensile strength retention rate (ASTM G154 / ASTM D638) Steps: Prepare the polypropylene plastic into a sample with a length of 50 mm, a width of 13 mm, and a thickness of 3 mm. Place the sample in a UV aging test box (equipped with a UVA-340 lamp tube), and set the parameters: irradiance is 0.71 W / m 2 , temperature is 60℃, and continuously run for 1000 hours. After aging, take the sample out of the test box and place it in a standard environment (23℃±2℃, relative humidity 50%±5%) for 24 h to eliminate the influence of thermal stress. Clamp the two ends of the sample before aging into the clamps of a universal material testing machine, start the testing machine, and record the maximum load P during the tensile processmax The maximum load after aging was measured again using the same method.

[0047] Calculation: Tensile strength = P max / A0, Tensile strength retention rate (%) = Tensile strength after aging / Tensile strength before aging x 100%; Wherein A0 is the original cross-sectional area of the sample.

[0048] Volume resistivity (ASTM D257-14) Steps: Polypropylene plastic is processed into a sample with a diameter of 60 mm and a thickness of 3 mm, which is placed on the ground electrode of the three-electrode clamp of the high resistance meter resistance tester (model: Keithley 6517B), ensuring that the center of the sample is aligned with the main electrode. Put down the main electrode and the protection electrode, apply 5N pressure, connect the circuit, put the whole device into the shielding box, connect the shielding wire to the ground of the high resistance meter, turn on the high resistance meter, preheat for 30 min to ensure stability, set the test voltage to 500V, start the instrument, wait for the current to stabilize, and record the volume resistance R at this time.

[0049] Calculation: Volume resistivity = R x (A / d); Wherein A is the area of the main electrode, and d is the thickness of the sample.

[0050] Notched impact strength (ISO 179-1:2010) Steps: Polypropylene plastic is processed into a sample with a length of 80 mm, a width of 10 mm, and a thickness of 4 mm, and a notch with a depth of 2 mm and a bottom radius of 0.25 mm is processed by a special notch sample machine. Put the sample on the simply supported beam special testing machine, with the notch of the sample facing the impact direction of the pendulum, release the pendulum, and record the energy W absorbed when the sample breaks.

[0051] Calculation: Notched impact strength = W / (b x h n ); b is the width of the sample, and h n is the remaining thickness of the sample at the notch.

[0052] Table 1 Test results

[0053] The melt flow rate data of Comparative Example 8 and Comparative Example 1 shows that the melt flow rate of polypropylene plastic is significantly improved by introducing lignin-polyethylene glycol grafting material.

[0054] The volume resistivity data of Comparative Example 8 and Comparative Example 1 shows that the volume resistivity of polypropylene plastic is significantly reduced by introducing lignin-polyethylene glycol grafting material.

[0055] The notched impact strength data of Comparative Example 8 and Comparative Example 1 can be obtained: the present application significantly improves the notched impact strength of polypropylene plastic by introducing lignin-polyethylene glycol graft.

[0056] The tensile strength retention rate data of Comparative Example 8 and Comparative Example 3 can be obtained: the present application introduces lignin-polyethylene glycol graft and aminosilica, both of which synergistically improve the anti-aging property of polypropylene plastic.

[0057] It should be noted that in this text, such as the term "include, contain" or any other variant is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes the elements inherent to such process, method, article or equipment.

[0058] Although embodiments of the present application have been shown and described, it will be understood by those having ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electrically conductive carbon black composite, characterized by, Preparation by the following steps: The conductive carbon black VXC72 and the lignin-polyethylene glycol graft are added into a high-speed mixer, the rotating speed is set to 3000r / min, and mixing is performed for 5min to obtain a conductive carbon black composite material.

2. The conductive carbon black composite of claim 1, wherein The specific surface area of the electrically conductive carbon black N330 is 250 m 2 / g.

3. The conductive carbon black composite of claim 1, wherein The conductive carbon black composite material comprises the following mass parts of raw materials: The conductive carbon black VXC72 is 18-22 parts, and the lignin-polyethylene glycol graft is 9-11 parts.

4. The conductive carbon black composite of claim 1, wherein The lignin-polyethylene glycol graft is prepared by the following steps: S1, lignin, polyethylene glycol and p-toluenesulfonic acid are added to anhydrous ethanol, stirred until completely dissolved, heated to 120℃, and reacted at a stirring speed of 300r / min for 3.5-4.5 hours. After completion, the suspension is poured into deionized water for precipitation, the solid is collected by suction filtration, and after completion, the crude product is obtained; S2, the crude product is washed with deionized water for 2-4 times, and after completion, vacuum drying is performed at 60℃ for 12 hours, and the product is ground through a 100 mesh sieve, and after completion, the lignin-polyethylene glycol graft is obtained.

5. The conductive carbon black composite of claim 4, wherein the conductive carbon black composite has a volume resistivity of 10"2 ohm-cm or less. The amount ratio of lignin, polyethylene glycol, p-toluenesulfonic acid, anhydrous ethanol, deionized water in S1 is 60g:25-35g:0.8-1.2g:400ml:1000ml.

6. Use of a conductive carbon black composite material according to any one of claims 1 to 5 in polypropylene plastic, characterized in that, The application comprises the following steps: T1, polypropylene particles are vacuum dried at 80℃ for 2 hours, then amino silica is vacuum dried at 80℃ for 4 hours, then the polypropylene particles and the conductive carbon black composite material are placed into a mixer and stirred at a speed of 800r / min for 5-10 minutes, then amino silica and antioxidant 1010 are added and continue to be stirred at a speed of 800r / min for 10-15 minutes to obtain a premix; T2, the temperature of each section of the twin-screw extruder is set to: zone 1 160℃, zone 2 170℃, zone 3 180℃, zone 4 185℃, and die 180℃. After the regions are stable, the premix is added to the hopper of the twin-screw extruder, the feeding rate is controlled at 2.5-3.5kg / h, and the screw speed is 300r / min for melt blending and extrusion. After the extrudate is water-cooled and drawn, it is cut into 2-4mm long particles using a granulator, and the particles are vacuum dried at 60℃ for 2 hours to obtain polypropylene plastic.

7. Use of an electrically conductive carbon black composite material according to claim 6 in polypropylene plastic, characterized in that, The polypropylene plastic comprises the following mass parts of raw materials: polypropylene particles 70-90 parts, conductive carbon black composite material 10-20 parts, amino silica 3-5 parts, and antioxidant 1010 0.5-1.0 parts.

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