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CN-121991472-A - Degradable polyester composite material garbage bag and preparation method thereof

CN121991472ACN 121991472 ACN121991472 ACN 121991472ACN-121991472-A

Abstract

The invention discloses a degradable polyester composite material garbage bag and a preparation method thereof, wherein the garbage bag comprises 50-62 parts of poly (adipic acid)/butylene terephthalate), 18-27 parts of poly (butylene succinate), 25-35 parts of modified starch, 5-10 parts of maleic anhydride ethylene-vinyl acetate copolymer, 8-12 parts of modified filler, 1.5-2.5 parts of composite functional agent and 0.5-1 part of composite lubricant. The polyester composite material garbage bag prepared by the invention has better mechanical property and mechanical strength while keeping good degradability.

Inventors

  • YUAN ZHIJIE
  • WANG DAN

Assignees

  • 安徽大力熊环保塑料科技有限公司

Dates

Publication Date
20260508
Application Date
20260305

Claims (10)

  1. 1. The degradable polyester composite material garbage bag is characterized by comprising 50-62 parts of poly (butylene adipate/terephthalate), 18-27 parts of polybutylene succinate, 25-35 parts of modified starch, 5-10 parts of maleic anhydride ethylene-vinyl acetate copolymer, 8-12 parts of modified filler, 1.5-2.5 parts of composite functional agent and 0.5-1 part of composite lubricant; The modified starch is obtained by modifying starch by maleic anhydride grafted castor oil; the modified filler is obtained by modifying calcium carbonate by maleic anhydride; The composite lubricant comprises ethylene oleamide and pentaerythritol stearate; The complex functional agent comprises acetyl trihexyl citrate and glycerol carbonate.
  2. 2. The degradable polyester composite garbage bag according to claim 1, wherein the modified filler is a deacetylated chitin coated calcium carbonate-maleic anhydride composite structure.
  3. 3. The degradable polyester composite garbage bag according to claim 1, wherein the modified starch preparation method comprises the following steps: (1) Mixing starch with water, stirring and heating in a boiling water bath until the starch is in a semitransparent gelatinized state, adding N, N-dimethylformamide, stirring and dissolving uniformly to form uniform pretreated starch solution; (2) Uniformly mixing and dissolving maleic anhydride modified castor oil, N-dimethylformamide and pyridine to form a maleic anhydride modified castor oil mixed solution; (3) And adding ceric ammonium nitrate into the pretreated starch solution, stirring and mixing, heating to 65-75 ℃, then dropwise adding the maleic acid modified castor oil solution, after the dropwise adding is completed within 30-40 min, carrying out heat preservation and stirring reaction for 5-8 h, adding methanol, stirring for 0.5-1 h, precipitating and separating by using absolute ethyl alcohol, and drying to obtain the modified starch.
  4. 4. The degradable polyester composite material garbage bag according to claim 3, wherein the mass ratio of the maleic anhydride modified castor oil to the starch is 0.8-1.2:1, and the starch is one of corn starch, potato starch and tapioca starch.
  5. 5. The degradable polyester composite garbage bag according to claim 2, wherein the modified filler preparation method comprises the following steps: (1) Dispersing calcium carbonate in water, stirring and dispersing uniformly to form uniform calcium carbonate suspension, adding maleic anhydride, heating to 50-60 ℃, carrying out heat preservation and stirring reaction for 90-120 min, precipitating and separating, and drying to obtain a calcium carbonate-maleic anhydride compound; (2) Dissolving deacetylated chitin in 1wt% acetic acid solution to form 2.5-5 wt% deacetylated chitin solution, uniformly stirring and dispersing the micron-sized calcium carbonate-maleic anhydride compound in water, heating to 50-60 ℃, dropwise adding the deacetylated chitin solution within 10-15 min, carrying out heat preservation reaction for 2-3 h after the dropwise adding is completed, precipitating and separating, and drying to obtain the deacetylated chitin coated calcium carbonate-maleic anhydride compound, namely the modified filler.
  6. 6. The degradable polyester composite material garbage bag according to claim 5, wherein the particle size of the calcium carbonate is 1-3 μm, the amount of the maleic anhydride is 1-2% of the mass of the calcium carbonate, and the amount of the deacetylated chitin is 8-10% of the mass of the calcium carbonate.
  7. 7. A degradable polyester composite disposal bag according to claim 1, wherein the composite functional agent consists of acetyl tri-hexyl citrate, glycerol carbonate, polyethylene glycol and acetyl ricinoleate; The composite lubricant consists of ethylene oleamide, pentaerythritol stearate and oxidized polyethylene wax.
  8. 8. The degradable polyester composite material garbage bag according to claim 7, wherein the mass ratio of acetyl trihexyl citrate to glycerol carbonate to polyethylene glycol to acetyl ricinoleate is 8-9:5-6:0.5-1:0.5-1.
  9. 9. The degradable polyester composite material garbage bag according to claim 7, wherein the mass ratio of the ethylene oleamide to the pentaerythritol stearate to the oxidized polyethylene wax is 3-4:2.5-3.5:1-2.5.
  10. 10. A preparation method of the degradable polyester composite material garbage bag according to any one of claims 1-9 is characterized by comprising the steps of weighing raw materials in parts by weight, mixing and stirring poly (adipic acid)/butylene terephthalate), poly (butylene succinate), modified starch, maleic anhydride ethylene-vinyl acetate copolymer, modified filler, composite functional agent and composite lubricant, and performing melt granulation, film blowing and bag making by a double-screw extruder to obtain the degradable polyester composite material garbage bag.

Description

Degradable polyester composite material garbage bag and preparation method thereof Technical Field The invention relates to a degradable polyester composite material garbage bag and a preparation method thereof, belonging to the technical field of garbage packaging. Background Along with the sustainable development of environmental awareness and environmental protection industry, the environmental protection plastic bag is widely popularized and applied. The environment-friendly plastic bag material is prepared by fermenting/synthesizing natural polymers such as starch or/and biodegradable polymers such as agricultural and sideline products by microorganisms, but the materials have the defects of poor mechanical properties, insufficient mechanical strength and the like. The existing degradable plastic bags are mostly prepared from pure polybutylene terephthalate-adipate (PBAT), polylactic acid (PLA) or polybutylene succinate (PBS) and other materials or simply blended, the pure PBAT, PBS or PLA raw materials are expensive, the mechanical properties and mechanical strength of the pure PBAT, PBS or PLA raw materials are still lower than those of the traditional plastic, and in addition, the problems of cracking, water leakage and the like easily occur when the degradable plastic bags are used as garbage bags, so that the application and popularization of the degradable plastic bags are hindered. Disclosure of Invention At least one problem in the prior art is solved by the invention, and the invention provides a degradable polyester composite material garbage bag and a preparation method thereof. In order to achieve the aim, the degradable polyester composite material garbage bag adopts the following technical scheme that the degradable polyester composite material garbage bag comprises 50-62 parts of poly (butylene adipate)/terephthalate), 18-27 parts of polybutylene succinate, 25-35 parts of modified starch, 5-10 parts of maleic anhydride ethylene-vinyl acetate copolymer, 8-12 parts of modified filler, 1.5-2.5 parts of composite functional agent and 0.5-1 part of composite lubricant. Preferably, the modified starch is obtained by modifying starch with maleic anhydride grafted castor oil. Preferably, the modified filler is obtained by modifying calcium carbonate with maleic anhydride. Preferably, the composite lubricant comprises ethylene oleamide and pentaerythritol stearate. Preferably, the complex functional agent comprises acetyl tri-hexyl citrate and glycerol carbonate. Preferably, the modified filler is in a deacetylated chitin coated calcium carbonate-maleic anhydride compound structure. Preferably, the modified starch is obtained by grafting and modifying maleic anhydride grafted castor oil and starch. Preferably, the modified starch preparation method comprises the following steps: (1) Mixing starch with water, stirring and heating in a boiling water bath until the starch is in a semitransparent gelatinized state, adding N, N-dimethylformamide, stirring and dissolving uniformly to form uniform pretreated starch solution; (2) Uniformly mixing and dissolving maleic anhydride modified castor oil, N-dimethylformamide and pyridine to form a maleic anhydride modified castor oil mixed solution; (3) And adding ceric ammonium nitrate into the pretreated starch solution, stirring and mixing, heating to 65-75 ℃, then dropwise adding the maleic acid modified castor oil solution, after the dropwise adding is completed within 30-40 min, carrying out heat preservation and stirring reaction for 5-8 h, adding methanol, stirring for 0.5-1 h, precipitating and separating by using absolute ethyl alcohol, and drying to obtain the modified starch. Preferably, the mass ratio of the maleic anhydride modified castor oil to the starch is 0.8-1.2:1. Preferably, the starch is one of corn starch, potato starch or tapioca starch. Preferably, the modified filler preparation method comprises the following steps: (1) Dispersing calcium carbonate in water, stirring and dispersing uniformly to form uniform calcium carbonate suspension, adding maleic anhydride, heating to 50-60 ℃, carrying out heat preservation and stirring reaction for 90-120 min, precipitating and separating, and drying to obtain a calcium carbonate-maleic anhydride compound; (2) Dissolving deacetylated chitin in 1wt% acetic acid solution to form 2.5-5 wt% deacetylated chitin solution, uniformly stirring and dispersing the micron-sized calcium carbonate-maleic anhydride compound in water, heating to 50-60 ℃, dropwise adding the deacetylated chitin solution within 10-15 min, carrying out heat preservation reaction for 2-3 h after the dropwise adding is completed, precipitating and separating, and drying to obtain the deacetylated chitin coated calcium carbonate-maleic anhydride compound, namely the modified filler. Preferably, the particle size of the calcium carbonate is 1-3 mu m. Preferably, the use amount of the maleic anhydride is 1-2% of the mass of the calcium