CN-122011700-A - Biodegradable composition and preparation method and application thereof

Abstract

The invention relates to a biodegradable composition, a preparation method and application thereof, wherein the biodegradable composition comprises, by weight, 41-97 parts of biodegradable polyester, 1-10 parts of polylactic acid, 1-15 parts of flaky mineral powder and 1-34 parts of calcium carbonate, and the relaxation time of the biodegradable polyester is 0.1-10 s. The biodegradable composition provided by the invention has higher 10% stretching strength, can avoid the cracking problem in the bag making process, and meets the requirement of rapid forming of an ultrathin film.

Inventors

• CHEN YEZHONG
• CHEN PINGXU
• MA MINJIAN
• FU XUEJUN
• MAI KAIJIN
• Chen Baodeng
• GUO HAOWEI
• AN FANGZHEN
• 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 composition is characterized by comprising 41-97 parts by weight of biodegradable polyester, 1-10 parts by weight of polylactic acid, 1-15 parts by weight of flaky mineral powder and 1-34 parts by weight of calcium carbonate; The relaxation time of the biodegradable polyester is 0.1-10 s.
2. 2. The biodegradable composition according to claim 1, characterized in that said biodegradable polyester comprises an aliphatic-aromatic copolyester; Preferably, the aliphatic-aromatic copolyester comprises at least one of polybutylene adipate terephthalate, polybutylene sebacate terephthalate, or polybutylene succinate terephthalate.
3. 3. Biodegradable composition according to claim 1, characterized in that the relaxation time of the biodegradable polyester is 0.2-8 s, preferably 0.35-5 s.
4. 4. The biodegradable composition according to claim 1, characterized in that said polylactic acid comprises PLLA/PDLA copolymer; Preferably, the intrinsic viscosity of the polylactic acid is 0.9 to 2.0dL/g, preferably 1.0 to 1.8dL/g, and more preferably 1.1 to 1.7dL/g.
5. 5. Biodegradable composition according to claim 1, characterized in that said flaky mineral powder comprises at least one of talc, montmorillonite or mica, preferably talc and/or montmorillonite.
6. 6. The biodegradable composition according to claim 1, characterized in that it further comprises 0.1 to 2 parts by weight of an opening agent; Preferably, the opening agent comprises at least one of silica, zeolite, barium sulfate or polyethylene wax, preferably at least one of silica, barium sulfate or polyethylene wax.
7. 7. The biodegradable composition according to claim 1, characterized in that it further comprises 0.1 to 2 parts by weight of a lubricant; preferably, the lubricant comprises at least one of erucamide, oleamide, monostearglycerate, pentaerythritol stearate, polyethylene wax, ethylene bisstearamide, or a silicon-based lubricant.
8. 8. A method of preparing the biodegradable composition according to any one of claims 1 to 7, comprising the steps of: and (3) carrying out melt blending on the components, extruding and granulating to obtain the biodegradable composition.
9. 9. A biodegradable product, characterized in that it is formed from the biodegradable composition according to any one of claims 1 to 7.
10. 10. The biodegradable product according to claim 9, characterized in that said biodegradable product comprises a film or a bag.

Description

Biodegradable composition and preparation method and application thereof Technical Field The invention relates to the technical field of high polymer materials, in particular to a biodegradable composition, a preparation method and application thereof. Background With the increasing environmental awareness, the problem of white pollution is increasingly focused. White pollution mainly comes from nondegradable plastic products such as Polyethylene (PE) and polypropylene (PP), etc., which are difficult to decompose in natural environment and have serious influence on the ecological system. Therefore, the gradual replacement of traditional plastics with biodegradable materials is a current trend. In the field of biodegradable materials, polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA) are common biodegradable materials which, after being compounded with mineral powder, can be used for manufacturing film bag products. However, with the trend of films requiring low gram weights, light weight and rapid forming, the thickness of the films is continually reduced, even up to 10 μm. The ultrathin film needs to be rapidly formed, so that the bag making pressure of the film is obviously increased, the tensile deformation of a bag making machine is generally controlled within 10%, and therefore, the 10% stretching strength becomes a key index for representing the bag making deformation capability. The film needs to have good deformation resistance in the bag making process so as to meet the requirement of rapid forming, otherwise, the film is easy to crack and the like, and the production efficiency and the product quality are affected. Therefore, providing a biodegradable material with good 10% stretching strength is a technical problem to be solved at present. Disclosure of Invention Aiming at the problems, the invention aims to provide a biodegradable composition, a preparation method and application thereof, and compared with the prior art, the biodegradable composition provided by the invention has higher 10% stretching strength, can avoid the cracking problem in the bag making process, and meets the requirement of rapid forming of an ultrathin film. In order to achieve the aim of the invention, the invention adopts the following technical scheme: In a first aspect, the invention provides a biodegradable composition, which comprises 41-97 parts of biodegradable polyester, 1-10 parts of polylactic acid, 1-15 parts of flaky mineral powder and 1-34 parts of calcium carbonate; The relaxation time of the biodegradable polyester is 0.1-10 s. In the present invention, 41 to 97 parts of the biodegradable polyester may be, for example, 41 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, 94 parts, 96 parts, 97 parts or a range between any of the above. In the present invention, 1 to 10 parts of polylactic acid may be, for example, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, or any range between the above values. In the present invention, 1 to 15 parts of the flaky ore powder may be, for example, 1 part, 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 or any range between the above values. In the present invention, 1 to 34 parts of calcium carbonate may be, for example, 1 part, 2 parts, 4 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, or a range between any of the above. In the present invention, the relaxation time of the biodegradable polyester is 0.1 to 10 seconds, and may be 0.1s、0.2s、0.4s、0.6s、0.8s、1s、1.2s、1.4s、1.6s、1.8s、2s、2.2s、2.4s、2.6s、2.8s、3s、3.2s、3.4s、3.6s、3.8s、4s、4.2s、4.4s、4.6s、4.8s、5s、5.2s、5.4s、5.6s、5.8s、6s、6.2s、6.4s、6.6s、6.8s、7s、7.2s、7.4s、7.6s、7.8s、8s、8.2s、8.4s、8.6s、8.8s、9s、9.2s、9.4s、9.6s、9.8s、10s or any value range described above, for example. In the biodegradable composition provided by the invention, the components such as biodegradable polyester, polylactic acid, flaky mineral powder and calcium carbonate are matched with each other to realize synergistic effect, wherein the entanglement characteristic of polyester molecular chains can be effectively regulated and controlled by controlling the relaxation time of the biodegradable polyester, when the relaxation time is too short, the degree of freedom of chain segment movement of the polyester molecular chains is too high, the entanglement speed is too high under the shearing action, the flaky mineral powder and the calcium carbonate are difficult to effectively coat and disperse, the inorganic filler is caused to be agglomerated, the grinding effect of a system is further enhanced, the molecul