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CN-121045661-B - High-density polyethylene-bio-based polyester blending material for degradable garbage can and preparation method thereof

CN121045661BCN 121045661 BCN121045661 BCN 121045661BCN-121045661-B

Abstract

The invention relates to the technical field of polyethylene, and discloses a high-density polyethylene-bio-based polyester blending material for a degradable garbage can and a preparation method thereof, the invention mixes the high-density polyethylene, the bio-based polyester, the styryl citrate grafted POE, the antioxidant and the filler, and extrudes the mixture in a double screw extruder to obtain the high-density polyethylene-bio-based polyester mixed material. The styrene-based citrate grafted POE improves the compatibility between polyethylene, polylactic acid and the like, and improves the mechanical property of the blending material. Polylactic acid and polylactide have excellent biodegradability, and POE side chain grafted citrate also has good biodegradability, and the biodegradation rate of the blend material can be improved when the blend material is added into a polyethylene material.

Inventors

  • ZENG JUN

Assignees

  • 广东中新实业有限公司

Dates

Publication Date
20260512
Application Date
20250825

Claims (7)

  1. 1. The high-density polyethylene-bio-based polyester blend material is characterized by comprising, by weight, 60-75 parts of high-density polyethylene, 25-40 parts of bio-based polyester, 15-30 parts of styryl citrate grafted POE,0.2-0.4 part of an antioxidant and 10-25 parts of a filler; Adding toluene, ethylene-octene copolymer, styryl formate citrate and dibenzoyl peroxide into a reaction kettle, introducing nitrogen for reaction, adding methanol into the solution for precipitation, filtering, collecting the precipitate, and extracting and purifying in a Soxhlet extractor by using acetone to obtain the styryl citrate grafted POE; Adding toluene, citrate, triethylamine and 4-dimethylamine pyridine into a reaction vessel, dropwise adding 4-vinyl benzoyl chloride into an ice water bath, then reacting for 18-24 hours at 25-45 ℃, filtering, distilling the filtrate under reduced pressure, washing with normal hexane, dissolving the product into ethyl acetate, heating for volatilization, cooling and crystallizing in an ice water bath to obtain the styryl formate citrate; The mol ratio of the citrate to the triethylamine to the 4-dimethylamine pyridine to the 4-vinyl benzoyl chloride is 1 (1-1.2) (0.03-0.05) (1.4-1.8); the citrate is trimethyl citrate, triethyl citrate, tripropyl citrate or tributyl citrate.
  2. 2. The high density polyethylene-bio-based polyester blend material according to claim 1, wherein said filler comprises calcium carbonate or talc, and wherein said antioxidant comprises antioxidant 1010 or antioxidant 168.
  3. 3. The high density polyethylene-bio-based polyester blend material as claimed in claim 1, wherein said bio-based polyester comprises polylactic acid or polycaprolactone.
  4. 4. The high-density polyethylene-bio-based polyester blend material according to claim 1, wherein the mass ratio of the ethylene-octene copolymer, the styryl formate citrate and the dibenzoyl peroxide is 100 (6-18): 0.3-0.8.
  5. 5. The high-density polyethylene-bio-based polyester blend material according to claim 1, wherein in the preparation method of styrene-based citrate grafted POE, the reaction temperature is 70-80 ℃ and the reaction time is 12-24h.
  6. 6. A process for preparing a high-density polyethylene-bio-based polyester blend material according to any one of claims 1 to 5, wherein the process comprises blending a high-density polyethylene, a bio-based polyester, a styrene-based citrate grafted POE, an antioxidant and a filler, extruding the blend material in a twin-screw extruder at a temperature of 150 to 200 ℃ in one to five zones, granulating the blend material, injection molding the blend material in an injection molding machine at a temperature of 170 to 200 ℃ in one to three zones, and obtaining the high-density polyethylene-bio-based polyester blend material.
  7. 7. Use of the high-density polyethylene-bio-based polyester blend material obtained by the preparation method according to claim 6 in degradable garbage cans.

Description

High-density polyethylene-bio-based polyester blending material for degradable garbage can and preparation method thereof Technical Field The invention relates to the technical field of polyethylene, in particular to a high-density polyethylene-bio-based polyester blending material for a degradable garbage can and a preparation method thereof. Background The high-density polyethylene has low cost, strong corrosion resistance, high hardness and excellent weather resistance, can be made into packaging bags, garbage cans, agricultural films, wires and cables and the like, and has wide application. The ethylene-octene copolymer POE elastomer has high elasticity and toughness and excellent wear resistance, and has important application in high polymer materials such as polyethylene, PBT polyester, nylon and the like. However, the use of polyethylene and other plastics in large amounts causes serious environmental problems such as white pollution. In recent years, development of biodegradable materials such as polylactic acid and polycaprolactone is a research hot spot, and blending of polyester such as polylactic acid with materials such as polyethylene can give the materials good biodegradability. However, the compatibility of polyethylene and polyester materials such as polylactic acid is poor, the mechanical properties of the materials are affected after blending, and usually, additives such as compatilizers are required to be added. Disclosure of Invention The invention provides a high-density polyethylene-bio-based polyester blending material and a preparation method thereof, which solve the problems of low strength and difficult biodegradation of polyethylene materials. In order to solve the technical problems, the technical scheme adopted by the invention is that the high-density polyethylene-bio-based polyester blending material and the preparation method thereof are adopted, wherein the blending material comprises 60-75 parts by weight of high-density polyethylene, 25-40 parts by weight of bio-based polyester, 15-30 parts by weight of styryl citrate grafted POE,0.2-0.4 part by weight of antioxidant and 10-25 parts by weight of filler. The preparation method of the blending material comprises the following steps: (1) Adding toluene, ethylene-octene copolymer, styryl formate citrate and dibenzoyl peroxide into a reaction kettle, introducing nitrogen for reaction, adding methanol into the solution for precipitation, filtering, collecting the precipitate, and extracting and purifying in a Soxhlet extractor by using acetone to obtain the styryl citrate grafted POE. (2) The high-density polyethylene-bio-based polyester blending material is prepared by blending high-density polyethylene, bio-based polyester, styrene-based citrate grafted POE, an antioxidant and a filler, extruding in a double-screw extruder, granulating, injection molding by an injection machine, and obtaining the high-density polyethylene-bio-based polyester blending material at the temperature of 170-200 ℃ in one to five areas of the extruder. Preferably, the filler comprises calcium carbonate or talc. Preferably, the antioxidants include antioxidant 1010 or antioxidant 168. Preferably, the bio-based polyester comprises polylactic acid or polycaprolactone. Preferably, the mass ratio of the ethylene-octene copolymer, the styryl formate citrate and the dibenzoyl peroxide is 100 (6-18) (0.3-0.8). Preferably, the reaction temperature is 70-80 ℃ and the reaction time is 12-24h. Preferably, the preparation method of the styryl formate citrate comprises the steps of adding toluene, citrate, triethylamine and 4-dimethylamine pyridine into a reaction vessel, dropwise adding 4-vinyl benzoyl chloride into an ice water bath, then reacting for 18-24 hours at 25-45 ℃, filtering, distilling the filtrate under reduced pressure, washing with normal hexane, dissolving the product into ethyl acetate, heating and volatilizing in a fume hood, and cooling and crystallizing in an ice water bath to obtain the styryl formate citrate. The reaction formula is as follows: Preferably, the mole ratio of the citrate, the triethylamine, the 4-dimethylamine pyridine and the 4-vinyl benzoyl chloride is 1 (1-1.2): 0.03-0.05): 1.4-1.8. Preferably, the citrate is trimethyl citrate, triethyl citrate, tripropyl citrate or tributyl citrate. Preferably, the high-density polyethylene-bio-based polyester blend material is applied to a degradable garbage can. The invention has the beneficial technical effects that the POE is subjected to solution grafting by using styryl formate citrate, a polystyrene molecular chain containing a citrate structure is introduced into the side chain of the POE, and then the POE is melt-blended with fillers such as high-density polyethylene, bio-based polyesters such as polylactic acid and the like, calcium carbonate and the like, so as to obtain a blend material. The POE is used as an olefin copolymer, has good compatibility with polyethylene, contains