Biodegradable polyester and use thereof

Abstract

The present invention relates to a biodegradable polyester and use thereof, including components: A) acid components containing following repeating units: 50 to 58 mol % of terephthalic acid A1; 30 to 40 mol % of sebacic acid A2; and 2 to 20 mol % of an aliphatic dibasic acid A3 with a carbon chain length of 6 or less; B) butanediol. In the present invention, in the case of a high content of the terephthalic acid, the biodegradable polyester prepared by introducing an aliphatic dibasic acid unit having a carbon chain length of 6 or less can satisfy the degradation performance and rigidity and improve the tenacity of the material simultaneously.

Claims

1. A biodegradable polyester, comprising components as follows in mole percent: A) acid components containing following repeating units: 51 to 56 mol % of terephthalic acid A1; 30 to 40 mol % of sebacic acid A2; and 6 to 14 mol % of an aliphatic dibasic acid A3 with a carbon chain length of 6 or less; and B) butanediol.

2. The biodegradable polyester according to claim 1, wherein the aliphatic dibasic acid A3 with the carbon chain length of 6 or less is one of or a mixture of two or more of adipic acid, glutaric acid and succinic acid.

3. The biodegradable polyester according to claim 1, wherein the biodegradable polyester is made into a film of 25±1 μm and tested using ISO 16929 (2013) standard to determine that a biodegradation rate at 90 days is greater than 90%.

4. The biodegradable polyester according to claim 1, wherein the biodegradable polyester is made into a film of 25±1 μm and tested using ISO 527 standard, a longitudinal elongation at break is greater than 530%, and a transverse elongation at break is greater than 800%.

5. A biodegradable polyester blend comprising the biodegradable polyester according to claim 1.

6. A preparation method of various film materials, comprising using the biodegradable polyester according to claim 1.

7. The preparation method of the various film materials according to claim 6, wherein the various film materials are biodegradable bags, mulching films, plastic wraps, or courier bags.

8. A biodegradable polyester blend comprising the biodegradable polyester according to claim 2.

9. A biodegradable polyester blend comprising the biodegradable polyester according to claim 3.

10. A biodegradable polyester blend comprising the biodegradable polyester according to claim 4.

11. A preparation method of various film materials, comprising using the biodegradable polyester blend according to claim 5.

12. The preparation method of the various film materials according to claim 11, wherein the various film materials are biodegradable bags, mulching films, plastic wraps, or courier bags.

Description

DESCRIPTION OF THE EMBODIMENTS

(1) The present invention is further described below by specific implementations. The following embodiments are preferred implementations of the present invention, but the implementations of the present invention are not limited by the following embodiments.

(2) The raw materials used in the embodiments and comparative examples are all commercially available.

(3) Synthesis of Biodegradable Polyester:

(4) Under the protection of carbon dioxide, as shown in Table 1, sebacic acid, an aliphatic dibasic acid with a carbon chain length of 6 or less, and 1,4-butanediol which were measured were put into the reactor, and under stirring conditions, the temperature was raised to 200-210° C. for reaction for 1 hour, and then terephthalic acid and tetra-(2-ethylhexyl) titanate were added, the temperature was raised to 220-230° C. for reaction for 1-2 hours, vacuumization was conducted, and the pressure in the reactor was reduced to 100 Pa or less within 2 hours, reaction was conducted at 230-260° C. for 2-4 hours, stirring was stopped, the reactor was filled with carbon dioxide, the resin was extruded out of the reactor to be pelletized to obtain a biodegradable polyester. An amount of sebacic acid, an amount of the aliphatic dibasic acid with the carbon chain length of 6 or less, an amount of 1,4-butanediol and an amount of terephthalic acid can be changed to obtain resins with different structures.

(5) Property Evaluation Method:

(6) Film tensile test method: the biodegradable polyester was made into a film of 25±1 μm, and then was tested by using ISO 527 standard.

(7) Test method for biodegradation rate: the biodegradable polyester was made into a film of 25±1 μm, and then was tested by using ISO 16929 (2013) standard.

(8) Test results are shown in Table 2 and Table 3.

(9) TABLE-US-00001 TABLE 1 Mass of each raw material in embodiments and comparative examples sebacic 1,4- terephthalic tetra-(2-ethylhexyl) adipic glutaric succinic acid butanediol acid titanate acid acid acid (g) (g) (g) (g) (g) (g) (g) Embodiment 1 2078.8 3473.6 2305.2 6.0 225.3 Embodiment 2 1994.0 3507.3 2327.6 6.0 274.2 Embodiment 3 2084.2 3482.5 2182.7 6.0 338.8 Embodiment 4 1877.9 3586.2 2247.7 6.0 438.6 Embodiment 5 1837.9 3509.8 2415.5 6.0 341.5 Embodiment 6 1692.7 3535.5 2433.2 6.0 458.7 Embodiment 7 1603.1 3571.7 2494.7 6.0 772.3 Embodiment 8 2071.7 3461.8 2467.5 6.0 74.8 Comparative 2356.7 3424.3 2272.5 6.0 Example 1 Comparative 2498.9 3408.6 2136.4 6.0 Example 2 Comparative 2261.1 3434.7 2363.8 6.0 Example 3

(10) TABLE-US-00002 TABLE 2 Mole content of each unit of embodiments and comparative examples terephthalic acid sebacic acid adipic acid glutaric acid succinic acid content (mol %) content (mol %) content (mol %) content (mol %) content (mol %) Embodiment 1 54.0 40.0 6.0 Embodiment 2 54.0 38.0 8.0 Embodiment 3 51.0 40.0 9.0 Embodiment 4 51.0 35.0 14.0 Embodiment 5 56.0 35.0 9.0 Embodiment 6 56.0 32.0 12.0 Embodiment 7 50.0 30.0 20.0 Embodiment 8 58.0 40.0 2.0 Comparative 54.0 46.0 Example 1 Comparative 51.0 49.0 Example 2 Comparative 56.0 44.0 Example 3

(11) TABLE-US-00003 TABLE 3 Results of property tests of embodiments and comparative examples Longitudinal Transverse Longitudinal Transverse Biodegradation tensile strength/ tensile strength/ elongation at break/ elongation at break/ rate % Mpa Mpa % % Embodiment 1 91 27 28 540 850 Embodiment 2 91 28 29 550 860 Embodiment 3 92 25 28 560 880 Embodiment 4 92 26 28 580 890 Embodiment 5 90 29 31 540 840 Embodiment 6 90 30 30 550 850 Embodiment 7 91 26 27 530 830 Embodiment 8 90 33 34 520 810 Comparative 83 25 28 450 780 Example 1 Comparative 85 23 22 530 800 Example 2 Comparative 79 28 32 400 750 Example 3

(12) As can be seen from the results of the embodiments and comparative examples in Table 3, in the present invention, by introducing the aliphatic dibasic acid unit with the carbon chain length of 6 or less, under the circumstance that the prepared biodegradable polyester satisfies the degradation performance and rigidity, the tenacity of the material can be improved simultaneously.