High-toughness polypropylene plastic bucket and preparation method thereof

Abstract

The invention relates to the technical field of polypropylene plastics, and particularly discloses a preparation method of a high-toughness polypropylene plastic bucket, which comprises the following steps: dissolving benzoyl peroxide in toluene, adding an organic silicon prepolymer with double bonds at one end, and uniformly mixing to prepare a mixed solution; adding polypropylene K8003 and polypropylene Z30S into a high-speed mixer, adding the mixed solution, and mixing at 105-120 DEG C for 5-15 minutes to obtain a mixture; carrying out extrusion granulation on the mixture to obtain modified polypropylene; adding the obtained modified polypropylene, PP-g-MAH, a hydrogenated styrene-butadiene block copolymer, vinyl-terminated silicone oil, modified titanium dioxide and an antioxidant into a high-speed mixer for mixing, performing extrusion granulation, and finally performing injection molding to obtain the high-toughness polypropylene plastic bucket. The polypropylene plastic bucket is prepared by combining the polypropylene K8003, the polypropylene Z30S, the modified titanium dioxide, the antioxidant, the PP-g-MAH, the hydrogenated styrene-butadiene block copolymer and other components, and the components interact with one another, so that the toughness and the impact resistance of the polypropylene plastic bucket are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of polypropylene plastics, in particular to a high-toughness polypropylene plastic barrel and a preparation method thereof. Background Art

[0002] Polypropylene (PP) plastic barrels have light density, and their mechanical properties such as yield strength, tensile strength, compressive strength and hardness are superior to low-pressure polyethylene (PE). They are also corrosion-resistant, non-toxic and odorless, easy to transport and have a long service life. They are widely used in many industries such as chemical raw materials, coatings, medicine, hardware and electronics, electromechanical and other industries, as well as liquids.

[0003] Currently, most plastic barrels are made from a single PP raw material. While this ensures process stability, it struggles to balance the demands of high fluidity with high impact resistance and toughness. For example, homopolymer PP barrels lack toughness and impact resistance at low temperatures, while high-impact copolymer PP faces issues such as uneven wall thickness due to insufficient melt strength. Consequently, most current polypropylene barrels suffer from brittleness and low toughness, leading to defects such as poor impact resistance. Furthermore, polypropylene is highly sensitive to ultraviolet light and is easily affected by light, heat, and oxygen, which can cause aging and degradation of the material, leading to a deterioration of its mechanical properties. This shortens the lifespan of polypropylene plastic and affects its usability.

[0004] The addition of plasticizers can increase the flexibility and improve the impact resistance of plastic products. However, most plasticizers have a small molecular weight and are prone to migration and precipitation, which limits their use in plastics. Inorganic filler-filled modified polypropylene can not only improve the impact resistance of the blend, but also have little effect on its rigidity and tensile strength. It also has the advantages of simple preparation process and low cost. Commonly used inorganic fillers include silica, graphene oxide, glass fiber, etc. However, when inorganic fillers are filled and modified, problems such as uneven distribution in the matrix and agglomeration often occur, which affect the performance of polypropylene plastics. Therefore, it is necessary to develop a plastic barrel with excellent properties such as high toughness, impact resistance and aging resistance. Summary of the Invention

[0005] In view of the above shortcomings, the present invention provides a high-toughness polypropylene plastic barrel and a preparation method thereof, which can improve the toughness, impact resistance and aging resistance of the polypropylene plastic barrel. The specific technical solution is as follows: A method for preparing a high-toughness polypropylene plastic barrel comprises the following steps: (1) dissolving benzoyl peroxide in toluene, adding a silicone prepolymer containing a double bond at one end and mixing evenly to form a mixed solution; adding polypropylene K8003 and polypropylene Z30S into a high-speed mixer, and then adding the mixed solution, and then mixing at 105-120° C. for 5-15 minutes to obtain a mixture; extruding and granulating the mixture to obtain modified polypropylene; (2) adding the modified polypropylene, PP-g-MAH, hydrogenated styrene-butadiene block copolymer, vinyl-terminated silicone oil, modified titanium dioxide, and antioxidant obtained in step (1) into a high-speed mixer, stirring for 10 to 15 minutes at 120 to 140° C. to obtain a mixture; extruding the mixture into granules, and finally performing injection molding to obtain a high-toughness polypropylene plastic barrel; The above raw material ratios are as follows, in parts by weight: 20-50 parts of polypropylene K8003, 40-140 parts of polypropylene Z30S, 5-10 parts of PP-g-MAH, 3-8 parts of hydrogenated styrene-butadiene block copolymer, 3-10 parts of silicone prepolymer containing a double bond at one end, 1-3 parts of modified titanium dioxide, 1-3 parts of antioxidant, 0.2-0.4 parts of benzoyl peroxide, and 2-4 parts of toluene.

[0006] The technical solution of the present application is based on the following technical principles: the present application combines polypropylene K8003 and polypropylene Z30S. Polypropylene K8003 is an impact-resistant copolymer that can provide impact resistance, and polypropylene Z30S is a high-flow antistatic homopolymer with high fluidity that can improve the injection molding filling effect. The combination of the two overcomes the shortcomings of single polypropylene plastic and improves the toughness and impact resistance of polypropylene plastic. In addition, the chemical corrosion resistance of K8003 is combined with the homopolymer structure of Z30S to improve tolerance to acidic and alkaline environments. It also has the advantages of lightweight and cost reduction. The silicone prepolymer containing a double bond at one end has a flexible long chain segment and a carbon-carbon double bond, which reacts with polypropylene for grafting. The introduction of a flexible long chain segment into polypropylene can reduce the brittleness of polypropylene plastic and improve its toughness and low-temperature impact resistance. The addition of modified titanium dioxide and antioxidants can improve the mechanical properties and aging resistance of polypropylene plastic. Further, by adding PP-g-MAH and hydrogenated styrene-butadiene block copolymer, the interfacial compatibility between the components is improved, and the interaction between the components improves the overall performance of the polypropylene plastic barrel. ‌

[0007] Preferably, in the above-mentioned method for preparing a high-toughness polypropylene plastic barrel, the modified nano-titanium dioxide preparation method includes: adding titanium dioxide to an ethanol-water solution and mixing to obtain a suspension; adding a surface modifier composed of ricinoleic acid and aminosilane to the suspension, wherein the mass ratio of ricinoleic acid to aminosilane is 1:1-3; and adding a surfactant in an amount of 3-7% of the mass of the titanium dioxide; ultrasonically vibrating, filtering, and drying to obtain the modified nano-titanium dioxide. The surface modifier composed of ricinoleic acid and aminosilane is used to surface-modify the titanium dioxide, thereby enhancing the dispersibility of the titanium dioxide, improving the bonding of the titanium dioxide to polypropylene, and reducing the adverse effects of uneven dispersion and agglomeration of the titanium dioxide on the overall performance of the polypropylene plastic.

[0008] Preferably, in the above-mentioned method for preparing high-toughness polypropylene plastic barrel, the ultrasonic oscillation process parameters are: ultrasonic oscillation power is 700~1200W, ultrasonic oscillation time is 1h~3h, and ultrasonic frequency is 30~50KHz.

[0009] Preferably, in the above-mentioned method for preparing a high-toughness polypropylene plastic barrel, the antioxidant is a composite antioxidant composed of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate and 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, with the mass ratio of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate to 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole being 2 to 3:1. A hindered amine light stabilizer and benzotriazole are used in a synergistic anti-aging system to improve the anti-aging properties of polypropylene plastic.

[0010] Preferably, in the above-mentioned method for preparing a high-toughness polypropylene plastic barrel, the structural formula of the organosilicon prepolymer containing a double bond at one end is as follows: Wherein n is 3 or 4, the organosilicon prepolymer containing a double bond at one end has a flexible long chain segment and a carbon-carbon double bond, and is grafted with polypropylene. The introduction of the flexible long chain segment into polypropylene can reduce the brittleness of polypropylene plastic and improve its toughness and low-temperature impact resistance.

[0011] Preferably, the preparation method of the above-mentioned high-toughness polypropylene plastic barrel includes, in parts by weight: 30 parts of polypropylene K8003, 120 parts of polypropylene Z30S, 8 parts of PP-g-MAH, 5 parts of hydrogenated styrene-butadiene block copolymer, 6 parts of silicone prepolymer containing a double bond at one end, 2 parts of modified titanium dioxide, 2 parts of antioxidant, 0.3 parts of benzoyl peroxide, and 3 parts of toluene.

[0012] Preferably, in the above-mentioned method for preparing a high-toughness polypropylene plastic barrel, in step (2), before mixing, the PP-g-MAH is subjected to plasma activation treatment, with an Ar / O2 ratio of 4:1, a vacuum degree of 30-60 Pa, a power of 50-200 W, and a treatment time of 30-70 seconds. Activating the PP-g-MAH improves the compatibility and bonding between the components, thereby improving the performance of the polypropylene plastic barrel.

[0013] On the other hand, the present invention also provides a high-toughness polypropylene plastic barrel, which is prepared by the above-mentioned preparation method of the high-toughness polypropylene plastic barrel.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention combines polypropylene K8003 and polypropylene Z30S to overcome the shortcomings of single polypropylene plastics, improving their toughness and impact resistance, and their tolerance to acidic and alkaline environments. It also offers advantages such as lightweighting and cost reduction. The addition of modified titanium dioxide and antioxidants enhances the mechanical properties and aging resistance of the polypropylene plastic. Furthermore, the addition of PP-g-MAH and hydrogenated styrene-butadiene block copolymer improves the interfacial compatibility between the components. The interaction between these components enhances the toughness and aging resistance of the polypropylene plastic barrel.

[0015] 2. The organic silicone prepolymer with a double bond at one end added in the present invention has a flexible long chain segment and a carbon-carbon double bond, which is grafted with polypropylene. The introduction of the flexible long chain segment into polypropylene can reduce the brittleness of polypropylene plastic, increase its toughness, and significantly improve its low-temperature impact resistance. DETAILED DESCRIPTION

[0016] The specific embodiments of the present invention are described in detail below, but it should be understood that the scope of protection of the present invention is not limited by the specific embodiments. Unless otherwise defined, all technical terms used hereinafter have the same meaning as those generally understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention. Unless otherwise specified, the various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or can be prepared by existing methods.

[0017] Example 1 A high-toughness polypropylene plastic barrel comprises the following raw materials, calculated in parts by weight: 330 parts of polypropylene K800, 120 parts of polypropylene Z30S, 8 parts of PP-g-MAH, 5 parts of hydrogenated styrene-butadiene block copolymer, 6 parts of an organosilicon prepolymer containing a double bond at one end, 2 parts of modified titanium dioxide, 2 parts of an antioxidant, 0.3 parts of benzoyl peroxide, and 3 parts of toluene.

[0018] The structural formula of the silicone prepolymer containing a double bond at one end is as follows: , n is 3. The preparation method of the organosilicon prepolymer containing a double bond at one end is prepared according to the method in CN101070388A.

[0019] The preparation method of modified nano-titanium dioxide includes: adding titanium dioxide to an 80% by volume ethanol aqueous solution and mixing to obtain a suspension; adding a surface modifier composed of ricinoleic acid and γ-aminopropyltriethoxysilane in a mass ratio of 1:2 to the suspension, and adding a surfactant in an amount of 5% of the mass of the titanium dioxide; ultrasonic oscillation with an ultrasonic oscillation power of 800W, an ultrasonic oscillation time of 1h, and an ultrasonic frequency of 40KHz; filtering; and vacuum drying at 80°C to obtain the modified nano-titanium dioxide.

[0020] A method for preparing a high-toughness polypropylene plastic barrel comprises the following steps: (1) According to parts by weight, benzoyl peroxide is dissolved in toluene, and a silicone prepolymer containing a double bond at one end is added and mixed to form a mixed solution; polypropylene K8003 and polypropylene Z30S are added to a high-speed mixer, and then the mixed solution is added, and then mixed at 110°C for 10 minutes to obtain a mixture; the mixture is added to a twin-screw extruder for extrusion and granulation, and the temperature parameters from the discharge part to the die are: 170°C, 190°C, 190°C, 190°C, 200°C, 200°C, 205°C, 205°C, 200°C; the main engine speed is 300r / min; the feeding speed is 30r / min; the pelletizing speed is 15r / min; and modified polypropylene is obtained; (2) The modified polypropylene, PP-g-MAH, hydrogenated styrene-butadiene block copolymer, vinyl-terminated silicone oil, modified titanium dioxide and antioxidant obtained in step (1) are added to a high-speed mixer and stirred at 125°C for 10 minutes to obtain a mixture; the mixture is added to a twin-screw extruder for granulation, and the temperature parameters from the discharge part to the die are: 170°C, 190°C, 190°C, 190°C, 200°C, 200°C, 205°C, 205°C, 200°C; the main engine speed is 300r / min; the feeding speed is 30r / min; the pelletizing speed is 15r / min; and finally, injection molding is carried out, and the temperature parameters of the injection molding machine from the discharge part to the nozzle are: 200°C, 200°C, 210°C, 210°C, 210°C, respectively, to obtain a high-toughness polypropylene plastic barrel.

[0021] Example 2 A high-toughness polypropylene plastic barrel comprises, by weight, 37.5 parts of polypropylene K8003, 112.5 parts of polypropylene Z30S, 7 parts of PP-g-MAH, 6 parts of hydrogenated styrene-butadiene block copolymer, 8 parts of an organosilicon prepolymer containing a double bond at one end, 3 parts of modified titanium dioxide, 1.5 parts of an antioxidant, 0.3 parts of benzoyl peroxide, and 3 parts of toluene.

[0022] The structural formula of the silicone prepolymer containing a double bond at one end is as follows: , n is 4. The preparation method of the organosilicon prepolymer containing a double bond at one end is prepared according to the method in CN101070388A.

[0023] The preparation method of modified nano-titanium dioxide includes: adding titanium dioxide to an 80% by volume ethanol aqueous solution and mixing to obtain a suspension; adding a surface modifier composed of ricinoleic acid and γ-aminopropyltriethoxysilane in a mass ratio of 1:1 to the suspension, and adding a surfactant in an amount of 7% of the mass of the titanium dioxide; ultrasonic oscillation with an ultrasonic oscillation power of 800W, an ultrasonic oscillation time of 1h, and an ultrasonic frequency of 40KHz; filtering; and vacuum drying at 80°C to obtain the modified nano-titanium dioxide.

[0024] A method for preparing a high-toughness polypropylene plastic barrel comprises the following steps: (1) Benzoyl peroxide is dissolved in toluene, and an organosilicon prepolymer containing a double bond at one end is added and mixed to form a mixed liquid; polypropylene K8003 and polypropylene Z30S are added to a high-speed mixer, and then the mixed liquid is added, and then mixed at 110°C for 10 minutes to obtain a mixed material; the mixed material is added to a twin-screw extruder for extrusion and granulation, and the temperature parameters from the discharge part to the die are: 170°C, 190°C, 190°C, 190°C, 200°C, 200°C, 205°C, 205°C, 200°C; the main engine speed is 300r / min; the feeding speed is 30r / min; the pelletizing speed is 15r / min; and modified polypropylene is obtained; (2) The modified polypropylene, PP-g-MAH, hydrogenated styrene-butadiene block copolymer, vinyl-terminated silicone oil, modified titanium dioxide and antioxidant obtained in step (1) are added to a high-speed mixer and stirred at 125°C for 10 minutes to obtain a mixture; the mixture is added to a twin-screw extruder for granulation, and the temperature parameters from the discharge part to the die are: 170°C, 190°C, 190°C, 190°C, 200°C, 200°C, 205°C, 205°C, 200°C; the main engine speed is 300r / min; the feeding speed is 30r / min; the pelletizing speed is 15r / min; and finally, injection molding is carried out, and the temperature parameters of the injection molding machine from the discharge part to the nozzle are: 200°C, 200°C, 210°C, 210°C, 210°C, respectively, to obtain a high-toughness polypropylene plastic barrel.

[0025] Example 3 A high-toughness polypropylene plastic barrel comprises the following raw materials, calculated by weight: 30 parts of polypropylene K8003, 120 parts of polypropylene Z30S, 8 parts of PP-g-MAH, 5 parts of hydrogenated styrene-butadiene block copolymer, 6 parts of an organosilicon prepolymer containing a double bond at one end, 2 parts of modified titanium dioxide, 2 parts of an antioxidant, 0.3 parts of benzoyl peroxide, and 3 parts of toluene.

[0026] The structural formula of the silicone prepolymer containing a double bond at one end is as follows: , n is 3. The preparation method of the organosilicon prepolymer containing a double bond at one end is prepared according to the method in CN101070388A.

[0027] The preparation method of modified nano-titanium dioxide includes: adding titanium dioxide to an 80% by volume ethanol aqueous solution and mixing to obtain a suspension; adding a surface modifier composed of ricinoleic acid and γ-aminopropyltriethoxysilane in a mass ratio of 1:2 to the suspension, and adding a surfactant in an amount of 5% of the mass of the titanium dioxide; ultrasonic oscillation with an ultrasonic oscillation power of 800W, an ultrasonic oscillation time of 1h, and an ultrasonic frequency of 40KHz; filtering; and vacuum drying at 80°C to obtain the modified nano-titanium dioxide.

[0028] A method for preparing a high-toughness polypropylene plastic barrel comprises the following steps: (1) Benzoyl peroxide is dissolved in toluene, and an organosilicon prepolymer containing a double bond at one end is added and mixed to form a mixed liquid; polypropylene K8003 and polypropylene Z30S are added to a high-speed mixer, and then the mixed liquid is added, and then mixed at 110°C for 10 minutes to obtain a mixed material; the mixed material is added to a twin-screw extruder for extrusion and granulation, and the temperature parameters from the discharge part to the die are: 170°C, 190°C, 190°C, 190°C, 200°C, 200°C, 205°C, 205°C, 200°C; the main engine speed is 300r / min; the feeding speed is 30r / min; the pelletizing speed is 15r / min; and modified polypropylene is obtained; (2) Plasma activation treatment of PP-g-MAH was performed with an Ar / O2 ratio of 4:1, a vacuum degree of 50 Pa, a power of 150 W, and a treatment time of 60 s to obtain activated PP-g-MAH; (3) The modified polypropylene obtained in step (1), the activated PP-g-MAH in step (2), the hydrogenated styrene-butadiene block copolymer, the vinyl-terminated silicone oil, the modified titanium dioxide, and the antioxidant are added to a high-speed mixer and stirred at 125°C for 10 minutes to obtain a mixture; the mixture is added to a twin-screw extruder for granulation, and the temperature parameters from the discharge part to the die are: 170°C, 190°C, 190°C, 190°C, 200°C, 200°C, 205°C, 205°C, 200°C; the main engine speed is 300r / min; the feed speed is 30r / min; and the pelletizing speed is 15r / min. Finally, injection molding is performed, and the temperature parameters of the injection molding machine from the discharge part to the nozzle are: 200°C, 200°C, 210°C, 210°C, and 210°C, respectively, to obtain a high-toughness polypropylene plastic barrel.

[0029] Comparative Example 1 A high-toughness polypropylene plastic barrel comprises, by weight, 60 parts of polypropylene K8003, 100 parts of polypropylene Z30S, 8 parts of PP-g-MAH, 5 parts of hydrogenated styrene-butadiene block copolymer, 6 parts of an organosilicon prepolymer containing a double bond at one end, 2 parts of modified titanium dioxide, 2 parts of an antioxidant, 0.3 parts of benzoyl peroxide, and 3 parts of toluene. Other parameters and preparation methods are the same as those in Example 1.

[0030] Comparative Example 2 A high-toughness polypropylene plastic barrel comprises, by weight, 25 parts of polypropylene K8003, 150 parts of polypropylene Z30S, 8 parts of PP-g-MAH, 5 parts of hydrogenated styrene-butadiene block copolymer, 6 parts of an organosilicon prepolymer containing a double bond at one end, 2 parts of modified titanium dioxide, 2 parts of an antioxidant, 0.3 parts of benzoyl peroxide, and 3 parts of toluene. Other parameters and preparation methods are the same as those in Example 1.

[0031] Comparative Example 3 This comparative example differs from Example 1 in that vinyltriethoxysilane is used to replace the organosilicon prepolymer containing a double bond at one end. Other parameters and preparation methods are the same as those of Example 1.

[0032] Comparative Example 4 This comparative example is different from Example 1 in that vinyl silicone oil (CH2=CH-Si(CH3)2O[(CH3)2SiO) n (CH3)2Si -CH=CH2) (vinyl content 1.94 mol%, viscosity 200mm 2 / s) to replace the organosilicon prepolymer containing a double bond at one end. Other parameters and preparation methods are the same as those in Example 1.

[0033] Comparative Example 5 This comparative example is different from Example 1 in that only γ-aminopropyltriethoxysilane is used as a surface modifier in the preparation method of modified nano-titanium dioxide, and other parameters and preparation methods are the same as those in Example 1.

[0034] The notched Izod impact strength of the polypropylene plastic drums in the examples and comparative examples was tested according to GB / T 1843. The test conditions were: 23°C / Type A and 0°C / Type A. The corresponding specimens were conditioned at 23°C for 24 hours and 0°C for 24 hours, respectively. The tensile strength was tested according to GB / T 1040. The test results are shown in Table 1.

[0035] Table 1 Impact resistance and anti-aging performance data of each group As can be seen from Table 1, the impact strength and low-temperature impact strength of the examples of the present application are significantly higher than those of the comparative examples. It can be seen from Example 1 and Comparative Examples 1 to 2 that the usage ratio of polypropylene K8003 and polypropylene Z30S has a greater impact on the impact strength of the plastic barrel. From the comparison of Example 1 and Comparative Example 3, it can be seen that the present invention uses a silicone prepolymer containing a double bond at one end to improve the toughness of polypropylene plastics, enhance impact resistance and low-temperature resistance. From Comparative Example 4, it can be seen that the use of vinyl silicone oil is not as effective as the silicone prepolymer containing a double bond at one end. This may be because vinyl silicone oil has high reaction activity and undergoes a cross-linking reaction with polypropylene, reducing the toughening effect. From the comparison of Example 1 and Comparative Example 5, it can be seen that the use of a composite surface modifier can improve the combination of titanium dioxide and polypropylene, and reduce the adverse effects of titanium dioxide on the comprehensive performance of polypropylene plastics due to uneven dispersion and agglomeration. The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for preparing a high-toughness polypropylene plastic barrel, characterized in that: The following steps are involved: (1) dissolving benzoyl peroxide in toluene, adding a silicone prepolymer containing a double bond at one end and mixing evenly to form a mixed solution; adding polypropylene K8003 and polypropylene Z30S into a high-speed mixer, and then adding the mixed solution, and then mixing at 105-120° C. for 5-15 minutes to obtain a mixture; extruding and granulating the mixture to obtain modified polypropylene; (2) adding the modified polypropylene, PP-g-MAH, hydrogenated styrene-butadiene block copolymer, vinyl-terminated silicone oil, modified titanium dioxide, and antioxidant obtained in step (1) into a high-speed mixer, stirring for 10 to 15 minutes at 120 to 140° C. to obtain a mixture; extruding the mixture into granules, and finally performing injection molding to obtain a high-toughness polypropylene plastic barrel; The above raw material ratios are as follows, in parts by weight: 20-50 parts of polypropylene K8003, 40-140 parts of polypropylene Z30S, 5-10 parts of PP-g-MAH, 3-8 parts of hydrogenated styrene-butadiene block copolymer, 3-10 parts of silicone prepolymer containing a double bond at one end, 1-3 parts of modified titanium dioxide, 1-3 parts of antioxidant, 0.2-0.4 parts of benzoyl peroxide, and 2-4 parts of toluene.

2. The method for preparing a high-toughness polypropylene plastic barrel according to claim 1, characterized in that: The preparation method of the modified nano-titanium dioxide comprises: adding titanium dioxide to an ethanol aqueous solution and mixing to obtain a suspension; adding a surface modifier composed of ricinoleic acid and aminosilane to the suspension, wherein the mass ratio of ricinoleic acid to aminosilane is 1:1-3; adding a surfactant in an amount of 3-7% of the mass of the titanium dioxide; ultrasonically vibrating, filtering, and drying to obtain the modified nano-titanium dioxide.

3. The method for preparing a high-toughness polypropylene plastic barrel according to claim 2, characterized in that: The ultrasonic oscillation process parameters are: ultrasonic oscillation power of 700-1200W, ultrasonic oscillation time of 1h-3h, and ultrasonic frequency of 30-50KHz.

4. The method for preparing a high-toughness polypropylene plastic barrel according to claim 1, characterized in that: The antioxidant is a composite antioxidant composed of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate and 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, and the mass ratio of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate to 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole is 2-3:

1.

5. The method for preparing a high-toughness polypropylene plastic barrel according to claim 1, characterized in that: The mass ratio of polypropylene K8003 to polypropylene Z30S is 1:3~4.

6. The method for preparing a high-toughness polypropylene plastic barrel according to claim 1, characterized in that: The invention comprises, in parts by weight: 30 parts of polypropylene K8003, 120 parts of polypropylene Z30S, 8 parts of PP-g-MAH, 5 parts of hydrogenated styrene-butadiene block copolymer, 6 parts of organic silicon prepolymer containing a double bond at one end, 2 parts of modified titanium dioxide, 2 parts of antioxidant, 0.3 parts of benzoyl peroxide, and 3 parts of toluene.

7. The method for preparing a high-toughness polypropylene plastic barrel according to claim 1, characterized in that: The structural formula of the organosilicon prepolymer containing a double bond at one end is as follows: Where n is 3 or 4.

8. The method for preparing a high-toughness polypropylene plastic barrel according to claim 1, characterized in that: In the step (2), before mixing, the PP-g-MAH is subjected to plasma activation treatment with an Ar / O2 ratio of 4:1, a vacuum degree of 30-60 Pa, a power of 50-200 W, and a treatment time of 30-70 s.

9. A high-toughness polypropylene plastic barrel, characterized in that: The plastic barrel is prepared by the preparation method of the high-toughness polypropylene plastic barrel according to any one of claims 1 to 8.

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