A plastic packaging bottle with good pressure resistance and preparation method thereof

Abstract

The present invention relates to the technical field of polymer materials, and proposes a plastic packaging bottle with good pressure resistance and a preparation method thereof. A plastic packaging bottle with good pressure resistance comprises the following components in parts by mass: 100 parts of high-density polyethylene, 1.5-3.5 parts of low-density polyethylene, 1-4 parts of modified alumina, 0.2-0.4 parts of antibacterial agent, 0.1-0.4 parts of antioxidant, and 0.15-0.35 parts of color powder, wherein the modified alumina comprises siloxane-modified alumina and a compound-modified alumina containing hydroxyl and carboxyl groups in a mass ratio of 1:7-7:1. Through the above technical scheme, the problem that the PE plastic packaging bottle in the related art has poor pressure resistance and is easily deformed by compression is solved.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a plastic packaging bottle with good pressure resistance and a preparation method thereof. Background Art

[0002] Plastic containers used for packaging include packaging bottles, packaging barrels, packaging cans, packaging cups, packaging trays, etc., among which plastic packaging bottles are more widely used. In order to ensure the packaging function, plastic packaging bottles need to have good mechanical properties, such as elasticity, plasticity, strength, toughness, etc., and also need to have good physical properties, such as barrier properties, light-shielding properties, heat resistance, cold resistance, etc., and also need to have good chemical stability, such as chemical resistance.

[0003] At present, the commonly used plastic types of plastic packaging bottles are polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), polystyrene (PS), polycarbonate (PC), etc. Among them, PE plastic packaging bottles mainly include low-density polyethylene (LDPE) plastic packaging bottles and high-density polyethylene (HDPE) plastic packaging bottles. They are widely used due to their opacity, good processability, low cost and good water vapor barrier properties. However, they have the problem of poor pressure resistance. When the pressure resistance of plastic packaging bottles is poor, the packaging bottles are easily deformed by compression. Summary of the invention

[0004] The invention provides a plastic packaging bottle with good compression resistance and a preparation method thereof, which solves the problem that the PE plastic packaging bottle in the related art has poor compression resistance and is easily deformed by compression.

[0005] The technical solution of the present invention is as follows:

[0006] A plastic packaging bottle with good pressure resistance comprises the following components in parts by mass: 100 parts of high-density polyethylene, 1.5-3.5 parts of low-density polyethylene, 1-4 parts of modified alumina, 0.2-0.4 parts of antibacterial agent, 0.1-0.4 parts of antioxidant, and 0.15-0.35 parts of color powder, wherein the modified alumina comprises siloxane-modified alumina and alumina modified by a compound containing hydroxyl and carboxyl groups in a mass ratio of 1:7-7:1.

[0007] The antibacterial agent, antioxidant and color powder in the present invention can be conventional components in the field. For example, the antibacterial agent can be one or more of nano titanium dioxide, nano zinc oxide, and nano silver. The antioxidant can be one or more of antioxidant 168, antioxidant 1010, and antioxidant 1076. The color powder can be one or more of titanium dioxide, anthraquinone compounds, phthalocyanine compounds, azo compounds, naphthyl ketone compounds, amino ketone compounds, anthrone compounds, and quinophthalone compounds.

[0008] As a further technical solution, the modified alumina includes siloxane-modified alumina and alumina modified by a compound containing hydroxyl groups and carboxyl groups in a mass ratio of 1:3 to 3:1.

[0009] The inventors found during the experiment that when the mass ratio of siloxane-modified alumina to alumina modified with a compound containing hydroxyl and carboxyl groups is 1:3 to 3:1, the compression resistance and tensile strength of the plastic packaging bottle are further improved.

[0010] The siloxane in the siloxane-modified alumina of the present invention may be any one or more siloxanes, such as vinyl siloxane, epoxy siloxane, amino siloxane, and mercapto siloxane.

[0011] The vinyl siloxane may be vinyl tri(β-methoxyethoxy)silane, the epoxy siloxane may be one or more of 3-glycidyloxypropyl trimethoxysilane, 3-glycidyloxypropyl triethoxysilane, 2-(3,4-epoxycyclohexyl)ethyl trimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyl triethoxysilane, and the amino siloxane may be γ-aminopropyl methyl dimethoxysilane, N-phenyl-γ-aminopropyl methyl dimethoxysilane, or N-phenyl-γ-aminopropyl methyl dimethoxysilane. The invention can be one or more of propyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, γ-diethylenetriaminopropyltrimethoxysilane, bis(3-trimethoxysilylpropyl)amine, bis(3-triethoxysilylpropyl)amine, and the mercaptosiloxane can be one or both of γ-mercaptopropyltrimethoxysilane and 3-mercaptopropyltriethoxysilane.

[0012] As a further technical solution, the siloxane-modified alumina is vinyl siloxane-modified alumina, for example, vinyl tris(β-methoxyethoxy)silane-modified alumina.

[0013] The invention adopts vinyl siloxane modified aluminum oxide to further improve the compression resistance and tensile strength of the plastic packaging bottle.

[0014] The compound containing hydroxyl group and carboxyl group in the present invention may be any one or more compounds containing hydroxyl group and carboxyl group, for example, it may be one or both of 4-hydroxycinnamic acid and p-hydroxyphenylpropionic acid.

[0015] As a further technical solution, the alumina modified with a compound containing hydroxyl and carboxyl groups is 4-hydroxycinnamic acid modified alumina.

[0016] In the present invention, the alumina modified by the compound containing hydroxyl and carboxyl groups is limited to 4-hydroxycinnamic acid modified alumina, which further improves the compression resistance and tensile strength of the plastic packaging bottle.

[0017] As a further technical solution, the particle size of the aluminum oxide in the vinylsiloxane-modified aluminum oxide is greater than the particle size of the aluminum oxide in the 4-hydroxycinnamic acid-modified aluminum oxide.

[0018] In the present invention, the particle size of aluminum oxide in the vinyl siloxane-modified aluminum oxide is defined as greater than the particle size of aluminum oxide in the 4-hydroxycinnamic acid-modified aluminum oxide, thereby further improving the compression resistance and tensile properties of the plastic packaging bottle.

[0019] As a further technical solution, the raw materials of the siloxane-modified alumina include siloxane and alumina in a mass ratio of 0.5 to 1:100.

[0020] As a further technical solution, the preparation method of the siloxane-modified alumina comprises the following steps: mixing alumina with an ethanol solution of siloxane, modifying the mixture, and drying the mixture to obtain the siloxane-modified alumina.

[0021] As a further technical solution, the raw material for modifying the aluminum oxide with the compound containing hydroxyl and carboxyl groups comprises the compound containing hydroxyl and carboxyl groups and aluminum oxide in a mass ratio of 0.1 to 0.5:10.

[0022] As a further technical solution, the preparation method of the compound modified aluminum oxide containing hydroxyl and carboxyl groups comprises the following steps: dissolving the compound containing hydroxyl and carboxyl groups in a solvent, adding aluminum oxide for modification, and drying to obtain the compound modified aluminum oxide containing hydroxyl and carboxyl groups.

[0023] The solvent in the present invention can be any solvent that can dissolve compounds containing hydroxyl groups and carboxyl groups, for example, it can be one or both of ethanol and ether.

[0024] The present invention also provides a method for preparing a plastic packaging bottle, comprising the following steps:

[0025] S1, mixing the low-density polyethylene, the modified alumina, the antibacterial agent, the antioxidant, and the color powder, and extruding and granulating the mixture to obtain a masterbatch;

[0026] S2, mixing the masterbatch with the high-density polyethylene, extruding, and blow-molding to obtain a plastic packaging bottle.

[0027] As a further technical solution, the method for preparing a plastic packaging bottle with good pressure resistance comprises the following steps:

[0028] S1, after mixing the low-density polyethylene and the siloxane-modified alumina, adding the alumina modified by the compound containing hydroxyl and carboxyl, the antibacterial agent, the antioxidant, and the color powder, mixing, extruding and granulating, to obtain a masterbatch;

[0029] S2, mixing the masterbatch with the high-density polyethylene, extruding, and blow-molding to obtain a plastic packaging bottle.

[0030] In the preparation method of the plastic packaging bottle defined in the present invention, low-density polyethylene and siloxane-modified alumina are first mixed, and then a compound containing hydroxyl and carboxyl groups is added to modify the alumina, thereby further improving the compression resistance and tensile strength of the plastic packaging bottle.

[0031] The working principle and beneficial effects of the present invention are:

[0032] 1. The present invention uses high-density polyethylene, low-density polyethylene, modified alumina, antibacterial agent, antioxidant and color powder as raw materials to provide a plastic packaging bottle with good pressure resistance, wherein the high-density polyethylene provides the plastic packaging bottle with good chemical corrosion resistance, low-temperature impact resistance and water vapor barrier properties, and the low-density polyethylene further improves the flexibility, impact resistance and water vapor barrier properties of the plastic packaging bottle on the basis of the high-density polyethylene. In addition, the modified alumina, antibacterial agent, antioxidant and color powder are added to ensure the pressure resistance, antibacterial and antioxidant properties of the plastic packaging bottle, and color the plastic packaging bottle.

[0033] 2. The modified alumina in the present invention includes siloxane-modified alumina and alumina modified by compounds containing hydroxyl groups and carboxyl groups. After the surface of alumina is modified by siloxane and compounds containing hydroxyl groups and carboxyl groups, the hydrophilic surface of alumina is lipophilic, thereby improving the affinity between alumina and polyethylene materials and improving the dispersibility of alumina, thereby improving the compression resistance and tensile strength of plastic packaging bottles.

[0034] 3. The plastic packaging bottle provided by the present invention has a wide range of applications and can be used for fresh milk packaging bottles, laundry detergent packaging bottles, cosmetic packaging bottles, seasoning packaging bottles, carbonated beverage packaging bottles, etc. DETAILED DESCRIPTION

[0035] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The parameters of the raw materials in the following examples and comparative examples are as follows:

[0037] High-density polyethylene is HDPE DMDA-8008H;

[0038] The low density polyethylene is LLDPE 9730.

[0039] Example 1

[0040] S1, after vinyl tri (β-methoxyethoxy) silane and anhydrous ethanol are prepared into a solution in a mass ratio of 1:5, the solution is set aside; according to the mass ratio of siloxane to alumina being 1:100, 10 parts of alumina L200Q with a particle size of 200 nm are mixed with the above solution, modified, and dried to obtain siloxane-modified alumina;

[0041] S2, dissolving 0.5 parts of p-hydroxyphenylpropionic acid in 20 parts of ethanol, adding 10 parts of aluminum oxide L200Q with a particle size of 200 nm, stirring at 3000 r / min for 50 min, stirring at 200 r / min for 40 min, and drying to obtain alumina modified with a compound containing hydroxyl and carboxyl groups;

[0042] S3, 3.5 parts of low-density polyethylene, 0.5 parts of siloxane-modified alumina, 3.5 parts of alumina modified by a compound containing hydroxyl and carboxyl groups, 0.4 parts of nano titanium dioxide, 0.4 parts of antioxidant 1076, and 0.35 parts of color powder are mixed, extruded and granulated to obtain a masterbatch;

[0043] S4, mixing the masterbatch with 100 parts of high-density polyethylene, extruding, and blow-molding to obtain a plastic packaging bottle.

[0044] Example 2

[0045] S1, after preparing a solution of vinyl tri(β-methoxyethoxy) silane and anhydrous ethanol in a mass ratio of 1:5, the solution is set aside; according to a mass ratio of siloxane to alumina of 0.5:100, 10 parts of alumina L200Q with a particle size of 200 nm are mixed with the above solution, modified, and dried to obtain siloxane-modified alumina;

[0046] S2, dissolving 0.1 parts of p-hydroxyphenylpropionic acid in 20 parts of ethanol, adding 10 parts of aluminum oxide L200Q with a particle size of 200 nm, stirring at 4000 r / min for 50 min, stirring at 100 r / min for 40 min, and drying to obtain alumina modified with a compound containing hydroxyl and carboxyl groups;

[0047] S3, 1.5 parts of low-density polyethylene, 0.125 parts of siloxane-modified alumina, 0.875 parts of alumina modified by a compound containing hydroxyl and carboxyl groups, 0.2 parts of nano zinc oxide, 0.1 parts of antioxidant 168, and 0.15 parts of color powder are mixed, extruded and granulated to obtain a masterbatch;

[0048] S4, mixing the masterbatch with 100 parts of high-density polyethylene, extruding, and blow-molding to obtain a plastic packaging bottle.

[0049] Example 3

[0050] The only difference from Example 1 is that vinyl tri(β-methoxyethoxy)silane is replaced by an equal amount of 3-glycidyloxypropyltrimethoxysilane.

[0051] Example 4

[0052] The only difference from Example 1 is that vinyltri(β-methoxyethoxy)silane is replaced by an equal amount of γ-aminopropylmethyldimethoxysilane.

[0053] Example 5

[0054] The only difference from Example 1 is that vinyltri(β-methoxyethoxy)silane is replaced by an equal amount of γ-mercaptopropyltrimethoxysilane.

[0055] Example 6

[0056] The only difference from Example 1 is that: S3, 3.5 parts of low-density polyethylene, 1 part of siloxane-modified alumina, 3 parts of alumina modified by a compound containing hydroxyl and carboxyl groups, 0.4 parts of nano titanium dioxide, 0.4 parts of antioxidant 1076, and 0.35 parts of color powder are mixed, extruded and granulated to obtain a masterbatch.

[0057] Example 7

[0058] The only difference from Example 1 is that: S3, 3.5 parts of low-density polyethylene, 2 parts of siloxane-modified alumina, 2 parts of alumina modified by a compound containing hydroxyl and carboxyl groups, 0.4 parts of nano titanium dioxide, 0.4 parts of antioxidant 1076, and 0.35 parts of color powder are mixed, extruded and granulated to obtain a masterbatch.

[0059] Example 8

[0060] The only difference from Example 1 is that: S3, 3.5 parts of low-density polyethylene, 3 parts of siloxane-modified alumina, 1 part of alumina modified by a compound containing hydroxyl and carboxyl groups, 0.4 parts of nano titanium dioxide, 0.4 parts of antioxidant 1076, and 0.35 parts of color powder are mixed, extruded and granulated to obtain a masterbatch.

[0061] Example 9

[0062] The only difference from Example 1 is that: S3, 3.5 parts of low-density polyethylene, 3.5 parts of siloxane-modified alumina, 0.5 parts of alumina modified by a compound containing hydroxyl and carboxyl groups, 0.4 parts of nano titanium dioxide, 0.4 parts of antioxidant 1076, and 0.35 parts of color powder are mixed, extruded and granulated to obtain a masterbatch.

[0063] Example 10

[0064] The only difference from Example 7 is that p-hydroxyphenylpropionic acid is replaced by an equal amount of 4-hydroxycinnamic acid.

[0065] Embodiment 11

[0066] The only difference from Example 10 is: S2, 0.5 parts of 4-hydroxycinnamic acid is dissolved in 20 parts of ethanol, 10 parts of alumina with a particle size of 600 mesh are added, and the mixture is stirred at 3000 r / min for 50 minutes, then stirred at 200 r / min for 40 minutes, and dried to obtain alumina modified with a compound containing hydroxyl and carboxyl groups.

[0067] Example 12

[0068] The only difference from Example 11 is: S1, prepare a solution of vinyl tri(β-methoxyethoxy) silane and anhydrous ethanol in a mass ratio of 1:5 and set it aside; according to the mass ratio of siloxane to alumina of 1:100, 10 parts of alumina with a particle size of 600 mesh are mixed with the above solution, modified, and dried to obtain siloxane-modified alumina.

[0069] Example 13

[0070] The only difference from Example 12 is: S2, 0.5 parts of 4-hydroxycinnamic acid is dissolved in 20 parts of ethanol, 10 parts of aluminum oxide L200Q with a particle size of 200 nm are added, and the mixture is stirred at 3000 r / min for 50 min, then at 200 r / min for 40 min, and dried to obtain aluminum oxide modified with a compound containing hydroxyl groups and carboxyl groups.

[0071] Embodiment 14

[0072] The only difference from Example 13 is: S3, after evenly mixing 3.5 parts of low-density polyethylene and 2 parts of siloxane-modified alumina, add 2 parts of modified alumina containing a compound containing hydroxyl and carboxyl groups, 0.4 parts of nano titanium dioxide, 0.4 parts of antioxidant 1076, and 0.35 parts of color powder, mix, extrude and granulate to obtain a masterbatch.

[0073] Comparative Example 1

[0074] S1, after vinyl tri (β-methoxyethoxy) silane and anhydrous ethanol are prepared into a solution in a mass ratio of 1:5, the solution is set aside; according to the mass ratio of siloxane to alumina being 1:100, 10 parts of alumina L200Q with a particle size of 200 nm are mixed with the above solution, modified, and dried to obtain siloxane-modified alumina;

[0075] S2, 3.5 parts of low-density polyethylene, 4 parts of siloxane-modified alumina, 0.4 parts of nano-titanium dioxide, 0.4 parts of antioxidant 1076, and 0.35 parts of color powder were mixed, extruded and granulated to obtain a masterbatch;

[0076] S3, mixing the masterbatch with 100 parts of high-density polyethylene, extruding, and blow-molding to obtain a plastic packaging bottle.

[0077] Comparative Example 2

[0078] S1, dissolving 0.5 parts of p-hydroxyphenylpropionic acid in 20 parts of ethanol, adding 10 parts of aluminum oxide L200Q with a particle size of 200 nm, stirring at 3000 r / min for 50 min, stirring at 200 r / min for 40 min, and drying to obtain alumina modified with a compound containing hydroxyl and carboxyl groups;

[0079] S2, 3.5 parts of low-density polyethylene, 4 parts of alumina modified with a compound containing hydroxyl and carboxyl groups, 0.4 parts of nano titanium dioxide, 0.4 parts of antioxidant 1076, and 0.35 parts of color powder are mixed, extruded and granulated to obtain a masterbatch;

[0080] S3, mixing the masterbatch with 100 parts of high-density polyethylene, extruding, and blow-molding to obtain a plastic packaging bottle.

[0081] Comparative Example 3

[0082] S1, 3.5 parts of low-density polyethylene, 4 parts of alumina L200Q with a particle size of 200 nm, 0.4 parts of nano titanium dioxide, 0.4 parts of antioxidant 1076, and 0.35 parts of color powder were mixed, extruded and granulated to obtain a masterbatch;

[0083] S2. Mix the masterbatch with 100 parts of high-density polyethylene, extrude it, and blow mold it to obtain a plastic packaging bottle.

[0084] Performance Test:

[0085] (1) Compression resistance: Take the plastic packaging bottle to be tested, place it at room temperature for 24 hours, and then place it vertically on a pressure testing machine. Apply pressure at a speed of 100 mm / min. The pressure that first rises to the maximum value on the load curve is taken as the compression resistance value of the plastic packaging bottle. The average of the five test results is recorded as the final result.

[0086] (2) Tensile properties: After making a 1A dumbbell-shaped specimen in accordance with the standard GB / T 1040.2-2022 "Determination of tensile properties of plastics Part 2: Test conditions for molded and extruded plastics", the tensile strength test was carried out in accordance with the standard GB / T 1040.1-2018 "Determination of tensile properties of plastics Part 1: General principles". The test speed was 1 mm / min, and the average of 5 test results was taken as the final result;

[0087] The test results are recorded in Table 1.

[0088] Table 1 Compression and tensile test results

[0089]

[0090] It can be seen from Table 1 that the plastic packaging bottle provided by the present invention has good compression resistance, and the plastic packaging bottle material has good tensile properties.

[0091] Compared with Comparative Examples 1 to 3, the compression resistance and tensile strength of the obtained plastic packaging bottles obtained by compounding siloxane-modified alumina and alumina modified with a compound containing hydroxyl and carboxyl groups in Examples 1 to 14 are higher than those in Comparative Examples 1 to 3, indicating that the combination of siloxane-modified alumina and alumina modified with a compound containing hydroxyl and carboxyl groups can improve the compression resistance and tensile strength of plastic packaging bottles.

[0092] The compression resistance and tensile strength of the plastic packaging bottle obtained in Example 1 are higher than those in Examples 3 to 5, indicating that the compression resistance and tensile strength of the plastic packaging bottle can be further improved by using vinyl siloxane-modified alumina.

[0093] The compression resistance and tensile strength of the plastic packaging bottles obtained in Examples 6 to 8 are higher than those in Example 1 and Example 9, indicating that the mass ratio of siloxane-modified alumina to alumina modified with compounds containing hydroxyl groups and carboxyl groups is 1:3 to 3:1, which can further improve the compression resistance and tensile strength of the plastic packaging bottles.

[0094] The compression resistance and tensile strength of the plastic packaging bottle obtained in Example 10 are higher than those in Example 7, indicating that the alumina modified with a compound containing hydroxyl and carboxyl groups is 4-hydroxycinnamic acid modified alumina, which can further improve the compression resistance and tensile strength of the plastic packaging bottle.

[0095] The compression resistance and tensile strength of the plastic packaging bottle obtained in Example 13 are higher than those in Examples 10 to 12, indicating that the particle size of alumina in vinylsiloxane-modified alumina is greater than the particle size of alumina in 4-hydroxycinnamic acid-modified alumina, which can further improve the compression resistance and tensile strength of the plastic packaging bottle.

[0096] The compression resistance and tensile strength of the plastic packaging bottle obtained in Example 14 are higher than those in Example 13, indicating that the compression resistance and tensile strength of the plastic packaging bottle can be further improved by first mixing low-density polyethylene and siloxane-modified alumina and then adding a compound containing hydroxyl and carboxyl groups to modify the alumina.

[0097] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A plastic packaging bottle with good pressure resistance, characterized in that: The invention comprises the following components in parts by mass: 100 parts of high-density polyethylene, 1.5 to 3.5 parts of low-density polyethylene, 1 to 4 parts of modified alumina, 0.2 to 0.4 parts of antibacterial agent, 0.1 to 0.4 parts of antioxidant, and 0.15 to 0.35 parts of toner, wherein the modified alumina comprises siloxane-modified alumina and a compound-modified alumina containing hydroxyl and carboxyl groups in a mass ratio of 1:7 to 7:1; The siloxane in the siloxane-modified alumina is one or more of vinyl siloxane, epoxy siloxane, amino siloxane, and mercapto siloxane; the compound containing hydroxyl and carboxyl groups in the compound-modified alumina containing hydroxyl and carboxyl groups is one or two of 4-hydroxycinnamic acid and p-hydroxyphenylpropionic acid; The preparation method of the compound-modified aluminum oxide containing hydroxyl and carboxyl groups comprises the following steps: dissolving the compound-modified aluminum oxide containing hydroxyl and carboxyl groups in a solvent, adding aluminum oxide for modification, and drying to obtain the compound-modified aluminum oxide containing hydroxyl and carboxyl groups.

2. A plastic packaging bottle with good pressure resistance according to claim 1, characterized in that: The modified alumina includes siloxane-modified alumina and alumina modified by a compound containing hydroxyl and carboxyl groups in a mass ratio of 1:3 to 3:

1.

3. A plastic packaging bottle with good pressure resistance according to claim 2, characterized in that: The siloxane-modified alumina is vinyl siloxane-modified alumina.

4. A plastic packaging bottle with good pressure resistance according to claim 3, characterized in that: The alumina modified by the compound containing hydroxyl and carboxyl groups is 4-hydroxycinnamic acid modified alumina.

5. A plastic packaging bottle with good pressure resistance according to claim 4, characterized in that: The particle size of aluminum oxide in the vinylsiloxane-modified aluminum oxide is greater than the particle size of aluminum oxide in the 4-hydroxycinnamic acid-modified aluminum oxide.

6. A plastic packaging bottle with good pressure resistance according to claim 1, characterized in that: The raw materials of the siloxane-modified alumina include siloxane and alumina in a mass ratio of 0.5 to 1:

100.

7. A plastic packaging bottle with good pressure resistance according to claim 6, characterized in that: The preparation method of the siloxane-modified aluminum oxide comprises the following steps: mixing aluminum oxide with an ethanol solution of siloxane, performing modification, and drying to obtain the siloxane-modified aluminum oxide.

8. A plastic packaging bottle with good pressure resistance according to claim 1, characterized in that: The raw materials for modifying aluminum oxide with a compound containing a hydroxyl group and a carboxyl group include a compound containing a hydroxyl group and a carboxyl group and aluminum oxide in a mass ratio of 0.1 to 0.5:

10.

9. The method for preparing a plastic packaging bottle with good pressure resistance according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, mixing the low-density polyethylene, the modified alumina, the antibacterial agent, the antioxidant, and the color powder, and extruding and granulating the mixture to obtain a masterbatch; S2, mixing the masterbatch with the high-density polyethylene, extruding, and blow-molding to obtain a plastic packaging bottle.

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