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CN-122011704-A - Modified PET plastic bottle and preparation method thereof

CN122011704ACN 122011704 ACN122011704 ACN 122011704ACN-122011704-A

Abstract

The application relates to the technical field of packaging materials, in particular to a modified PET plastic bottle and a preparation method thereof. The application provides a modified PET plastic bottle which comprises, by weight, 100 parts of PET resin, 5-15 parts of PEFT, 3-10 parts of MBS, 2-8 parts of TPEE, 0.25-0.75 part of compound antioxidant, 0.05-0.2 part of nano talcum powder, 0.05-0.3 part of carboxylate nucleating agent, 0.1-0.3 part of oxidized rice bran wax calcium salt, 0.05-0.15 part of calcium tert-butylphosphonate, a heat-resistant system and an antibacterial system, and simultaneously, the preparation method of the modified PET plastic bottle enables the product to have comprehensive excellent performances of high strength, high heat resistance, high antibacterial property and high transparency simultaneously by precisely controlling the melting reaction extrusion granulation process parameters and optimizing the injection-stretch-blow molding process, and is suitable for industrial production.

Inventors

  • CHEN PENG

Assignees

  • 亦程(广东)包装科技有限公司

Dates

Publication Date
20260512
Application Date
20260323

Claims (10)

  1. 1. A modified PET plastic bottle is characterized by comprising, by weight, 100 parts of PET resin, 5-15 parts of PEFT, 3-10 parts of MBS, 2-8 parts of TPEE, 0.25-0.75 part of compound antioxidant, 0.05-0.2 part of nano talcum powder, 0.05-0.3 part of carboxylate nucleating agent, 0.1-0.3 part of oxidized rice bran wax calcium salt and 0.05-0.15 part of calcium tert-butyl phosphonate.
  2. 2. The modified PET plastic bottle according to claim 1, wherein the PEFT is prepared by adding 2, 5-furandicarboxylic acid, terephthalic acid, ethylene glycol and a catalyst into a reaction kettle according to the following proportion, carrying out esterification reaction for 2-4 hours at 200-230 ℃ under the protection of nitrogen, then heating to 250-270 ℃, gradually vacuumizing to 50-60Pa, carrying out polycondensation reaction for 3-5 hours, breaking vacuum by nitrogen after the reaction is finished, cooling a melt, granulating, and drying to obtain the PEFT.
  3. 3. The modified PET plastic bottle of claim 2, wherein the ratio of the total moles of ethylene glycol to the total moles of diacid in the PEFT is (1.3-1.8): 1, wherein the 2, 5-furandicarboxylic acid is 1.5-4% of the total moles of diacid and the terephthalic acid is 96-98.5% of the total moles of diacid.
  4. 4. The modified PET plastic bottle according to claim 2, wherein the catalyst is used in an amount of 0.03-0.04% of the total mass of diacid, and the catalyst is one or more of tetrabutyl titanate and ethylene glycol antimony.
  5. 5. The modified PET plastic bottle according to claim 1, wherein the compound antioxidant comprises the following raw materials, by weight, 0.1-0.4 part of hindered phenol antioxidants, 0.1-0.2 part of phosphite antioxidants and 0.05-0.15 part of polyethylene glycol monooleate.
  6. 6. The modified PET plastic bottle of claim 1, further comprising a heat resistant system comprising, by weight, 0.3-1.5 parts of an epoxy functionalized polymer chain extender, 0.5-1.0 parts of modified montmorillonite, and 0.3-0.6 parts of SEBS-g-MA graft.
  7. 7. The modified PET plastic bottle of claim 1, further comprising an antimicrobial system comprising 0.3-1.0 parts of zinc-loaded nano zeolite.
  8. 8. A process for the preparation of a modified PET plastic bottle as claimed in any one of claims 1 to 7, characterized in that it comprises the following steps: S1, blending and granulating, namely adding PET resin, PEFT, MBS, TPEE, a compound antioxidant, nano talcum powder, carboxylate nucleating agent, oxidized rice bran wax calcium salt and tertiary butyl calcium phosphonate into a high-speed mixer, uniformly mixing, putting the mixed materials into a double-screw extruder for melt reaction, extrusion and granulating, and cooling, air-drying and granulating the extruded materials to prepare modified PET composition granules; S2 injection-stretch-blow molding, namely injection molding the modified PET composition granules obtained in the step S1 into a tube blank by an injection molding machine, wherein the injection molding temperature is 250-270 ℃, the injection molding pressure is 60-90MPa, the mold temperature is 20-40 ℃, heating and temperature regulating the injection molded tube blank to 90-105 ℃ in a heating furnace to ensure that the tube blank temperature is uniform, sending the heated tube blank into a blow molding mold for biaxial stretching blow molding, controlling the axial stretching ratio to be (2.8-3.2): 1, the radial stretching ratio to be (3.2-3.8): 1, controlling the blow molding mold temperature to be 100-120 ℃, and the blow molding pressure to be 2.5-4.0MPa, and cooling and shaping to obtain the modified PET plastic bottle.
  9. 9. The method for preparing modified PET plastic bottles according to claim 8, further comprising adding an antibacterial system and a heat-resistant system, premixing modified montmorillonite and part of PET resin in a high-speed mixer for 5 minutes, enabling montmorillonite to be attached to the surface of the PET resin preliminarily, preparing montmorillonite premix, mixing epoxy functionalized polymer chain extender, SEBS-g-MA graft, zinc-loaded nano zeolite and stearic acid in the high-speed mixer, and adding the rest of PET resin and other components into the high-speed mixer together for blending granulation.
  10. 10. The method for preparing the modified PET plastic bottle according to claim 8, wherein the step S1 is characterized in that the extrusion granulation is carried out by a melting reaction, the extrusion temperature is 220-240 ℃ in a feeding section, 240-250 ℃ in a conveying section, 250-260 ℃ in a melting section, 250-260 ℃ in a mixing section, 245-255 ℃ in a metering section, 245-255 ℃ in a machine head, and the screw rotation speed is 300-500rpm, and the residence time is 2 minutes.

Description

Modified PET plastic bottle and preparation method thereof Technical Field The invention relates to the technical field of packaging materials, in particular to a modified PET plastic bottle and a preparation method thereof. Background Polyethylene terephthalate (PET), which is a thermoplastic polyester material, is widely used in the packaging field because of its excellent transparency, good processability, non-toxicity, and relatively low cost. Particularly in the field of beverage packaging, PET plastic bottles become mainstream products for replacing glass and polystyrene materials, and are widely applied to scenes such as cold drinks, fruit juice, milk tea, drinking water and the like. The PET material is light, is not easy to break, is convenient to transport and use, has good recycling value, and accords with the development trend of green and environment protection. However, with the expansion of consumer upgrading and application scenes, higher requirements are put on the comprehensive performance of PET plastic bottles in the market, and particularly in the aspects of hot beverage bearing, repeated use, sanitation, safety and the like, the conventional PET materials are difficult to meet diversified requirements. Despite the wide application of PET plastic bottles, there are significant technical drawbacks in practical use. Firstly, the glass transition temperature of PET materials is low (about 70-80 ℃), when the PET materials are used for containing high-temperature liquids, such as hot coffee and hot tea, and the temperature is usually more than 85 ℃, the cup body is easy to soften and deform, even the structure is invalid, and the application of the PET materials in the hot drink packaging field is severely limited. In addition, although the PET material has certain toughness, the PET material has limited shock resistance, and particularly when the PET material is in a low-temperature environment or a cup body has a stress concentration area, the PET material is extremely easy to generate brittle fracture due to accidental falling or collision, so that not only is the content leaked and resource wasted, but also potential safety hazards are possibly formed for users. In addition, as a drinking tool frequently contacted in daily life, the PET plastic bottle is easy to grow bacteria in the using and placing process, and the conventional common PET cup lacks an antibacterial function, so that the increasing demands of consumers on sanitation and safety are difficult to meet. In view of the above problems, some improvements have been made in the prior art, such as increasing toughness by adding an elastomer, improving crystallinity by adding a nucleating agent to improve heat resistance, or imparting an antibacterial function by applying an antibacterial coating. However, these improvements are usually optimized for only a single performance, and there are often cases where the addition of a rubber toughening agent can improve the impact resistance, but often results in a decrease in heat resistance, where the addition of an antimicrobial agent (particularly, inorganic antimicrobial particles) easily forms stress concentration points in the matrix, but rather reduces the mechanical strength, and where the multilayer composite structure can give consideration to various performances, but has a complicated preparation process, a high cost, and affects the transparency and recovery purity of the product. Therefore, how to synchronously achieve the synergistic improvement of impact resistance, heat resistance and antibacterial property in a single material system, and maintain good transparency and processability becomes a technical problem to be solved in the art. Aiming at the defects of the prior art, the art needs to develop a modified PET plastic bottle and a preparation method thereof, wherein the PET plastic bottle has excellent impact resistance, heat resistance and antibacterial property, simultaneously maintains the relative simplification of the preparation process and good transparency, and has obvious technical progress and industrial application value. Disclosure of Invention In order to satisfy the effects that PET plastic bottles have excellent impact resistance, heat resistance and antibacterial property, while maintaining the relative simplification of the preparation process and good transparency, the application provides a modified PET plastic bottle and a preparation method thereof. In a first aspect, the application provides a modified PET plastic bottle, which adopts the following technical scheme: The modified PET plastic bottle comprises, by weight, 100 parts of PET resin, 5-15 parts of PEFT, 3-10 parts of MBS, 2-8 parts of TPEE, 0.25-0.75 part of a compound antioxidant, 0.05-0.2 part of nano talcum powder, 0.05-0.3 part of a carboxylate nucleating agent, 0.1-0.3 part of oxidized rice bran wax calcium salt and 0.05-0.15 part of calcium tert-butyl phosphonate. By adopting the