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CN-122011701-A - Biodegradable polyester composition and application thereof

CN122011701ACN 122011701 ACN122011701 ACN 122011701ACN-122011701-A

Abstract

The invention provides a biodegradable polyester composition and application thereof, wherein the biodegradable polyester composition comprises, by weight, 40-93 parts of polyester, 2-20 parts of polylactic acid, 5-40 parts of filler and 0.5-5 parts of nucleating agent, and the ratio of the low-frequency complex viscosity number to the high-frequency complex viscosity number of the polyester is 2-100. The biodegradable polyester composition has high film blowing yield in the film blowing molding process.

Inventors

  • CHEN YEZHONG
  • CHEN PINGXU
  • FU XUEJUN
  • Chen Baodeng
  • GONG DEJUN
  • GUO HAOWEI
  • CHEN MINGKUN
  • ZENG XIANGBIN

Assignees

  • 珠海金发生物材料有限公司
  • 金发科技股份有限公司
  • 辽宁金发生物材料有限公司

Dates

Publication Date
20260512
Application Date
20260318

Claims (10)

  1. 1. The biodegradable polyester composition is characterized by comprising, by weight, 40-93 parts of polyester, 2-20 parts of polylactic acid, 5-40 parts of filler and 0.5-5 parts of nucleating agent; the ratio of the low-frequency composite viscosity number to the high-frequency composite viscosity number of the polyester is 2-100.
  2. 2. Biodegradable polyester composition according to claim 1, characterized in that the ratio of the low frequency complex viscosity to the high frequency complex viscosity of the polyester is 4-80, preferably 6-50; Preferably, the low-frequency complex viscosity number of the polyester is 1000 to 5000Pa.s, more preferably 1400 to 4200Pa.s, and still more preferably 1800 to 2800 Pa.s.
  3. 3. Biodegradable polyester composition according to claim 1 or 2, characterized in that the polyester comprises an aliphatic-aromatic copolyester and/or an aliphatic polyester, preferably an aliphatic-aromatic copolyester; Preferably, the aliphatic-aromatic copolyester comprises any one or a combination of at least two of polybutylene adipate terephthalate, polybutylene sebacate terephthalate and polybutylene succinate terephthalate; Preferably, the aliphatic polyester comprises polybutylene succinate.
  4. 4. A biodegradable polyester composition according to any one of claims 1 to 3, characterized in that said polylactic acid comprises at least one of poly D-lactic acid, poly L-lactic acid or a copolymer of D-lactic acid and L-lactic acid, more preferably a copolymer of D-lactic acid and L-lactic acid.
  5. 5. Biodegradable polyester composition according to any one of claims 1 to 4, characterized in that said polylactic acid is selected from the group consisting of D-lactic acid and L-lactic acid copolymers comprising a first D-lactic acid and L-lactic acid copolymer and/or a second D-lactic acid and L-lactic acid copolymer, more preferably a first D-lactic acid and L-lactic acid copolymer; Preferably, the molar content of the D-lactic acid in the first D-lactic acid and L-lactic acid copolymer is 0.1-5%, more preferably 0.5-4%; Preferably, the molar content of the D-lactic acid in the second D-lactic acid and L-lactic acid copolymer is 85-99%, more preferably 93-98%.
  6. 6. Biodegradable polyester composition according to any one of claims 1 to 5, characterized in that said nucleating agent has a D 98 of 2 to 30 μm, more preferably 4 to 20 μm; preferably, the nucleating agent comprises at least one of talc, montmorillonite, zeolite or barium sulfate, more preferably talc and/or montmorillonite.
  7. 7. The biodegradable polyester composition according to any one of claims 1 to 6, characterized in that said filler comprises at least one of calcium carbonate, diatomaceous earth, wollastonite, kaolin or mica powder.
  8. 8. The biodegradable polyester composition according to any one of claims 1 to 7, characterized in that it further comprises 0.01 to 5 parts by weight of an auxiliary agent; preferably, the auxiliary agent comprises at least one of an opening agent, a lubricant, an antioxidant, a compatibilizer, a nucleating agent, a colorant, or a stabilizer.
  9. 9. A polyester film or bag, characterized in that it is produced from the biodegradable polyester composition according to any one of claims 1 to 8.
  10. 10. The polyester film or bag of claim 9, wherein the method of making the polyester film or bag comprises blow molding; Preferably, the film blowing yield per unit area of the polyester film bag in the film blowing forming process is 20-30 kg/h.mm 2 .

Description

Biodegradable polyester composition and application thereof Technical Field The invention belongs to the technical field of high polymer materials, and particularly relates to a biodegradable polyester composition and application thereof. Background With the increasing severity of white contamination, it is imperative to seek more environmentally friendly materials to replace traditional non-degradable materials. The biodegradable material can be decomposed by microorganisms in natural environment, so that the pollution of the material to the environment can be obviously reduced, and the biodegradable material has low cost and good comprehensive performance and is widely applied to daily necessities such as packaging films, agricultural films, disposable film bags, disposable tableware and the like. In order to obtain the biodegradable material with better performance, the biodegradable material is usually compounded by polyester, polylactic acid, filler and the like, so that the application range of the biodegradable material is enlarged, but the composition of the system has lower film blowing yield in the film blowing production process, and seriously affects the production efficiency. Therefore, development of a biodegradable polyester composition with high film blowing yield at the time of film blowing is a problem to be solved in the art. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a biodegradable polyester composition and application thereof. The biodegradable polyester composition has high film blowing yield in the film blowing forming process. To achieve the purpose, the invention adopts the following technical scheme: In a first aspect, the invention provides a biodegradable polyester composition, which comprises, by weight, 40-93 parts of polyester, 2-20 parts of polylactic acid, 5-40 parts of filler and 0.5-5 parts of nucleating agent, wherein the ratio of the low-frequency complex viscosity number to the high-frequency complex viscosity number of the polyester is 2-100. The method comprises the steps of pressing polyester into a sheet with the thickness of 3mm by using a tabletting machine, placing the sheet into a rotary rheometer, balancing for 5min at 150 ℃, then carrying out strain scanning experiments, wherein the strain is 1.0%, the shearing rate is from 0.01Hz to 100Hz, carrying out strain scanning tests, and reading the compound viscosity at 0.01Hz and 100Hz, namely the low-frequency compound viscosity and the high-frequency compound viscosity. In the invention, the ratio of the low-frequency composite viscosity number to the high-frequency composite viscosity number of the polyester is controlled within a specific range, so that the film bubble is facilitated to be rapidly cooled and shaped in the film blowing forming process, and the film blowing yield is improved. In the present invention, 40 to 93 parts of polyester may be, for example, 40 parts, 42 parts, 44 parts, 46 parts, 48 parts, 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, 60 parts, 62 parts, 64 parts, 66 parts, 68 parts, 70 parts, 72 parts, 74 parts, 76 parts, 78 parts, 80 parts, 82 parts, 84 parts, 86 parts, 88 parts, 90 parts, 92 parts or any of the above, and more preferably 49 to 77 parts, and particularly preferably 57 to 73 parts. In the invention, the mass percentage of polyester in the biodegradable polyester composition is more than or equal to 40%, more preferably 45-80%, and particularly preferably 55-65%. In the invention, 2-20 parts of polylactic acid can be, for example, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts or range values composed of any two of the two parts, wherein the content of the polylactic acid is in a specific range, the improvement of the film blowing yield is facilitated, the content of the polylactic acid is too high, the compatibility of the polylactic acid and polyester is gradually reduced, so that the microscopic interface is separated, the film blowing yield is influenced, the content is too low, the stiffness of the material is low, the film blowing is not facilitated, the film blowing yield is low, and the content is preferably 5-17 parts, and particularly preferably 8-13 parts. In the invention, the mass percentage of polylactic acid in the biodegradable polyester composition is more than or equal to 2%, more preferably 5-16%, and particularly preferably 7-13%. In the present invention, the biodegradable polyester composition further comprises 5 to 40 parts of filler, for example, 5 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, 40 parts or a range of values composed of any two of them, more preferably 12 to 35 parts, particularly preferably 19 to 27 parts. In t