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CN-122011476-A - Degradable bio-based composite plastic cosmetic bottle and preparation method thereof

CN122011476ACN 122011476 ACN122011476 ACN 122011476ACN-122011476-A

Abstract

The invention discloses a degradable bio-based composite plastic cosmetic bottle and a preparation method thereof, which belong to the technical field of high polymer materials and cosmetic packaging, wherein the cosmetic bottle comprises a bottle body obtained by injection molding of a bio-based composite material, the bio-based composite material comprises, by weight, 40-60 parts of polylactic acid, 10-25 parts of modified plant fibers, 5-15 parts of supported nano calcium carbonate, 5-15 parts of bio-based elastomer and 2-5 parts of compatilizer, a bionic grid structure is constructed on the surface of the inner wall of the bottle body, and a bacteriostatic functional layer for supporting natural plant extracts is formed on the surface of the bottle body in situ. The invention has the advantages of high biological base content, excellent mechanical property and good antibacterial effect of the obtained cosmetic bottle through the synergistic innovation design of the material, structure and process, and the preparation method is simple and efficient and meets the requirements of green environmental protection.

Inventors

  • Tang shanghua
  • Su Eryan

Assignees

  • 纳莱科技(广东)有限公司

Dates

Publication Date
20260512
Application Date
20260302

Claims (10)

  1. 1. A degradable bio-based composite plastic cosmetic bottle is characterized by comprising a bottle body and a bacteriostatic functional layer attached to the inner wall of the bottle body; the bottle body is obtained by injection molding of a bio-based composite material, and the bio-based composite material comprises, by weight, 40-60 parts of polylactic acid, 10-25 parts of modified plant fibers, 5-15 parts of supported nano calcium carbonate, 5-15 parts of a bio-based elastomer and 2-5 parts of a compatilizer; The inner wall surface of the bottle body is constructed with a bionic grid structure; The supported nano calcium carbonate is nano calcium carbonate loaded with natural plant extracts, and the antibacterial functional layer is formed on the surface of the bionic grid structure by the supported nano calcium carbonate.
  2. 2. The degradable bio-based composite plastic cosmetic bottle according to claim 1, wherein the modified plant fiber is microcrystalline cellulose or bamboo fiber surface-modified by a silane coupling agent, and the average length-diameter ratio is (10-20): 1.
  3. 3. The degradable bio-based composite plastic cosmetic bottle according to claim 1 is characterized in that the average particle size of the nano calcium carbonate is 50-80 nm, the natural plant extract is tea polyphenol or mugwort essential oil, and the natural plant extract is loaded in or on a pore canal of the nano calcium carbonate, wherein the loading amount accounts for 5-15% of the mass of the nano calcium carbonate.
  4. 4. The degradable bio-based composite plastic cosmetic bottle according to claim 1, wherein the bio-based elastomer is poly (adipic acid)/poly (butylene terephthalate) or poly (butylene succinate), and the compatibilizer is poly (lactic acid) -grafted glycidyl methacrylate or epoxy-functionalized chain extender.
  5. 5. The degradable bio-based composite plastic cosmetic bottle according to claim 1, wherein the bionic lattice structure is composed of lattice-shaped distributed grooves with a depth of 0.1-0.3 mm and a width of 0.2-0.5 mm.
  6. 6. A method for preparing the degradable bio-based composite plastic cosmetic bottle according to any one of claims 1 to 5, comprising the steps of: (1) The preparation of the supported nano calcium carbonate comprises the steps of dissolving natural plant extracts in absolute ethyl alcohol, adding nano calcium carbonate, stirring and adsorbing after ultrasonic dispersion, and drying to remove a solvent to obtain the supported nano calcium carbonate; (2) Dispersing plant fibers in an ethanol water solution, adding a silane coupling agent, adjusting the pH value to 4-5, reacting for 2-4 hours at 50-70 ℃, washing and drying to obtain modified plant fibers; (3) Blending and granulating the bio-based composite material, namely uniformly mixing the dried polylactic acid, the bio-based elastomer, the modified plant fiber obtained in the step (2), the supported nano calcium carbonate obtained in the step (1) and the compatilizer according to a proportion, and carrying out melt blending, extrusion, cooling and granulating by a double-screw extruder to obtain bio-based composite material granules; (4) Injection molding, namely injecting the bio-based composite material granules obtained in the step (3) into a mold cavity with a bionic grid-like structure texture, adopting a three-section injection molding process for molding, cooling and then opening the mold to obtain a bottle body; (5) In-situ formation of the antibacterial functional layer, namely, when the melt in the step (4) fills the die cavity, the nano calcium carbonate loaded with the natural plant extract migrates and enriches to the inner wall of the bottle body under the action of shearing force, and the antibacterial functional layer is formed on the surface of the bionic grid structure after cooling.
  7. 7. The method for preparing the degradable bio-based composite plastic cosmetic bottle according to claim 6, wherein in the step (1), the ultrasonic dispersion time is 15-30 min, and the adsorption condition is that stirring and adsorption are carried out at 30-50 ℃ for 2-6 h.
  8. 8. The method for producing a biodegradable plastic composite cosmetic bottle according to claim 6, wherein in the step (3), the processing temperature of the twin-screw extruder is 160 to 190 ℃ and the screw rotation speed is 200 to 400rpm.
  9. 9. The method for preparing a degradable bio-based composite plastic cosmetic bottle according to claim 6, wherein in the step (4), the three-stage injection molding process specifically comprises: The first stage of mold filling, namely the injection temperature is 170-180 ℃, the injection pressure is 80-90 MPa, and the injection speed is 60-70 mm/s; the second stage of pressure maintaining, namely gradient control is adopted to reduce the pressure maintaining pressure from 60MPa to 40MPa, the pressure maintaining speed is 20-30 mm/s, and the pressure maintaining time is 5-8 s; And in the third cooling stage, the temperature of the die is controlled to be 30-40 ℃ and the cooling time is 8-12 s.
  10. 10. The method for preparing a biodegradable plastic composite cosmetic bottle according to claim 6, wherein in the injection molding process in step (4), an in-mold gas back pressure technique is further adopted, and a reverse air pressure of 0.3-0.8 mpa is applied to the mold cavity in the melt mold filling stage.

Description

Degradable bio-based composite plastic cosmetic bottle and preparation method thereof Technical Field The invention relates to the technical field of high polymer materials and cosmetic packaging, in particular to a degradable bio-based composite plastic cosmetic bottle and a preparation method thereof. Background At present, with increasing importance of global environmental protection and sustainable development, the cosmetic industry is accelerating to change to green, low-carbon and recyclable directions. The traditional cosmetic packaging mostly adopts non-degradable plastics such as glass or PE, PP, PET, and the like, is difficult to recycle or naturally degrade after being abandoned, and causes serious white pollution and resource waste. Therefore, development of cosmetic packaging materials which have excellent mechanical properties, high barrier properties, attractive appearance and can be completely biodegraded has become a research hotspot in the industry. Polylactic acid (PLA) is used as a bio-based degradable polyester derived from renewable resources (such as corn starch), has good biocompatibility, transparency and mechanical strength, and is one of ideal candidate materials for replacing traditional petroleum-based plastics. However, PLA has defects of large brittleness, poor heat resistance, slow crystallization rate, etc., which severely limits its application in the fields of cosmetic packaging, etc. To improve the performance of PLA, the prior art generally employs methods such as blend modification, fiber reinforcement, or nanocomposite. For example, chinese patent application publication No. CN115895217a discloses a blow-molding grade biodegradable material for cosmetic containers, which contains components such as carbon nanotube modified PLA and PBAT, but carbon nanotubes are costly and have potential biosafety problems. The Chinese patent application with publication number of CN112694729A discloses a formula of a degradable bottle embryo, which adopts organic glass fiber to strengthen PLA, but the glass fiber is not degradable, and the full degradation characteristic of the material is destroyed. In addition, the prior art pays attention to modification of the material, and reports on integrated design of a material formula, a product microstructure and a forming process are few, and especially, the mechanical property is improved, and meanwhile, additional functions of bacteriostasis, fresh keeping and the like are given to the product so as to meet the severe requirements of high-end cosmetic packaging. Therefore, how to cooperatively solve the problems of large brittleness, poor interface combination, single function and the like of PLA-based materials through innovative formula design, ingenious microstructure and accurate molding process, and prepare the fully-degradable cosmetic bottle with excellent comprehensive performance, controllable cost and high added value, is still a technical problem to be solved in the field. Disclosure of Invention Aiming at the technical bottlenecks that the degradable bio-based plastic in the prior art has large brittleness, insufficient toughness, poor interface compatibility, single function, difficulty in simultaneously considering high strength, high degradation performance and the like when being used for cosmetic packaging, the invention provides a degradable bio-based composite plastic cosmetic bottle and a preparation method thereof. The invention aims to prepare the fully-degradable cosmetic bottle with high bio-base content, excellent mechanical property (high strength and toughness), antibacterial and fresh-keeping functions and high molding precision through the synergistic and innovative design of the material, structure and process. In order to achieve the above purpose, the present invention adopts the following technical scheme: In a first aspect, the invention provides a degradable bio-based composite plastic cosmetic bottle, which comprises a bottle body and a bacteriostatic functional layer attached to the inner wall of the bottle body; The bottle body is obtained by injection molding of a bio-based composite material, and the bio-based composite material comprises, by weight, 40-60 parts of polylactic acid (PLA), 10-25 parts of modified plant fibers, 5-15 parts of supported nano calcium carbonate, 5-15 parts of a bio-based elastomer and 2-5 parts of a compatilizer; The inner wall surface of the bottle body is constructed with a bionic grid structure; The supported nano calcium carbonate is nano calcium carbonate loaded with natural plant extracts, and the antibacterial functional layer is formed on the surface of the bionic grid structure by the supported nano calcium carbonate. In some specific technical schemes of the invention, the modified plant fiber is microcrystalline cellulose or bamboo fiber which is surface modified by a silane coupling agent, and the average length-diameter ratio is (10-20): 1. By carrying out sur