A biodegradable composition, its preparation and use

By controlling the dispersion state of starch in different solvents and compounding it with biodegradable polyester, polylactic acid, and plasticizers, the puncture strength and tear strength of biodegradable materials were improved, solving the problem of weak puncture resistance and enabling the application of high-performance biodegradable films.

CN122167958APending Publication Date: 2026-06-09ZHUHAI KINGFA BIOMATERIAL CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHUHAI KINGFA BIOMATERIAL CO LTD
Filing Date
2026-03-18
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing biodegradable materials have weak puncture resistance, limiting their application in bearing sharp objects. Furthermore, traditional improvement methods, such as adding metallocene polyethylene or irradiation treatment, are not permitted in the biodegradable industry. Multilayer membrane structure equipment is costly and inefficient.

Method used

By controlling the dispersion state of starch in different solvents and adjusting the D90 particle size ratio, combined with the compounding of biodegradable polyester, polylactic acid and plasticizer, the dispersion performance and plasticizing effect of starch are optimized, thereby improving the puncture strength and tear strength of the material.

Benefits of technology

It achieves high puncture strength and lifting performance of biodegradable materials, with puncture strength exceeding 3.0N, puncture displacement exceeding 6.3mm, and maximum lifting weight exceeding 1.7kg, meeting the requirements for lightweighting and thinning.

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Abstract

The application provides a biodegradable composition and a preparation method and application thereof, the biodegradable composition comprises 59-94 parts of biodegradable polyester, 1-6 parts of polylactic acid, 5-35 parts of starch and 1-10 parts of plasticizer in terms of weight parts; the D90 value of the starch after being dispersed with ethanol as a solvent is recorded as D1, the D90 value of the starch after being dispersed with a 30% ethanol aqueous solution as a solvent is recorded as D2, and 1.0<=D1 / D2<=1.8. In the application, the biodegradable composition has good puncture resistance and lifting performance, and the durability of the film is improved.
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Claims

1. A biodegradable composition, characterized in that, The biodegradable composition comprises, by weight, 59-94 parts of biodegradable polyester, 1-6 parts of polylactic acid, 5-35 parts of starch and 1-10 parts of plasticizer; The D90 value of the starch dispersed in ethanol as a solvent is denoted as D1, and the D90 value of the starch dispersed in an aqueous ethanol solution with a mass concentration of 30% is denoted as D2, where 1.0 ≤ D1 / D2 ≤ 1.

8.

2. The biodegradable composition according to claim 1, characterized in that, The D90 value of the starch dispersed in ethanol as a solvent is denoted as D1, and the D90 value of the starch dispersed in an aqueous ethanol solution with a mass concentration of 30% is denoted as D2, where 1.1 ≤ D1 / D2 ≤ 1.

6.

3. The biodegradable composition according to claim 1, characterized in that, The biodegradable polyester includes aliphatic-aromatic copolyesters; Preferably, the aliphatic-aromatic copolyester comprises at least one of polybutylene adipate terephthalate, polybutylene sebacate terephthalate, or polybutylene succinate terephthalate. Preferably, the aliphatic-aromatic copolyester has a viscosity-average molecular weight of 100,000 to 200,000 Da, more preferably 110,000 to 190,000 Da, and even more preferably 120,000 to 170,000 Da.

4. The biodegradable composition according to claim 1, characterized in that, The polylactic acid includes at least one of PLLA, PDLA, or PLLA / PDLA copolymer.

5. The biodegradable composition according to claim 1, characterized in that, The starch includes at least one of corn starch, potato starch, rice starch, cassava starch, or esterified, etherified, or oxidized derivatives of the aforementioned substances.

6. The biodegradable composition according to claim 1, characterized in that, The plasticizer accounts for 10-50% of the starch mass, preferably 15-40%, and more preferably 18-35%.

7. The biodegradable composition according to claim 1, characterized in that, The plasticizer comprises a combination of a polyhydroxy organic compound and water; Preferably, the polyhydroxy organic compound includes at least one of glycerol, diglycerol, triglycerol, tetraglycerol, ethylene glycol, or sorbitol; Preferably, the average molar mass Ma of the plasticizer is 25~250 g / mol, more preferably 26~200 g / mol, and even more preferably 28~180 g / mol; Preferably, the average hydroxyl content Ha of the plasticizer is 2~5.8 mol hydroxyl / mol plasticizer, more preferably 2.2~5.5 mol hydroxyl / mol plasticizer, and even more preferably 2.3~4.8 mol hydroxyl / mol plasticizer.

8. A method for preparing a biodegradable composition according to any one of claims 1 to 7, characterized in that, The preparation method includes the following steps: The components are melt-blended and then extruded and granulated to obtain the biodegradable composition.

9. A biodegradable product, characterized in that, The biodegradable product is formed from the biodegradable composition according to any one of claims 1 to 7.

10. The biodegradable product according to claim 9, characterized in that, The biodegradable products include films or bags.