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Preparation method of high-molecular polylactic acid (PLA) three-dimensional composite material capable of being crystallized rapidly

A high-molecular-weight, polylactic acid technology, applied in the field of preparation of high-molecular-weight polylactic acid stereocomposite materials, can solve the problems of complex chemical structures of nucleating aids, affecting large-scale applications, and high preparation costs, and achieve large-scale industrial production , Improve nucleation effect, low cost effect

Inactive Publication Date: 2015-01-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these nucleating additives have complex chemical structures, are difficult to synthesize, and have high preparation costs, which affect their large-scale application.

Method used

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  • Preparation method of high-molecular polylactic acid (PLA) three-dimensional composite material capable of being crystallized rapidly
  • Preparation method of high-molecular polylactic acid (PLA) three-dimensional composite material capable of being crystallized rapidly
  • Preparation method of high-molecular polylactic acid (PLA) three-dimensional composite material capable of being crystallized rapidly

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Experimental program
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preparation example Construction

[0039] A method for preparing a rapidly crystallizable high molecular weight polylactic acid stereocomplex material, the specific preparation steps include: taking PLLA, PDLA, and an organometallic phosphonate nucleating agent, and adopting solution or melt blending to obtain a rapidly crystallizable high Molecular weight polylactic acid stereocomposite material; wherein, the mass of the organometallic phosphonate nucleating agent accounts for 0.1% to 3% of the total composition, the mass of the polylactic acid matrix accounts for 99.9 to 97% of the total composition, and the mass percentage of each component The sum is 100%; the mass percentage of PLLA in the polylactic acid matrix is ​​50% to 90%, and the mass percentage of PDLA is 10% to 50%. The solution and melt blending method of PLLA, PDLA and crystallization nucleating agent in the present invention are not particularly limited, and known methods can be used.

[0040] When using the solution blending method to prepare,...

Embodiment 1～7

[0060] Embodiment 1~7 is prepared by solution method blending

[0061] The mass percentage of the polylactic acid matrix is ​​99%, and the mass percentage of different types of nucleating agents is 1%. PLLA, PDLA and nucleating agent were weighed according to the composition mass ratio in Table 1, and then dissolved in chloroform, the concentration of the polymer solution was 50g / L, stirred to make it evenly mixed, and then cast in a polytetrafluoroethylene petri dish, The solvent was completely evaporated at room temperature, and then dried in a vacuum oven at 60 °C for 6 h. Wherein, if chloroform is replaced by dichloromethane, the preparation of this embodiment can also be completed.

Embodiment 8

[0062] Embodiment 8 is prepared by melt blending

[0063] The mass percentage of the polylactic acid matrix is ​​99%, and the mass percentage of the nucleating agent is 1%. Premix 49.5 parts by mass of PLLA, 49.5 parts by mass of PDLA, and 1 part by mass of PPZn according to the composition and mass ratio in Table 1, and then add them to the HAAKE MiniLab II twin-screw mixer, knead at 230°C for 3 minutes, and then extrude and pelletize.

[0064] In order to further illustrate the nucleating effect of the nucleating agent in the blend system of equal amounts of PLLA and PDLA, in Comparative Example 1, only the same amount of PLLA and PDLA were blended by solution method. Weigh 50 parts by mass of PLLA and 50 parts by mass of PDLA according to the composition and mass ratio in Table 1. In the solution chloroform, the concentration of the polymer solution is 50g / L, stir to make it evenly mixed, and then cast it on a polytetrafluoroethylene petri dish The solvent was completely e...

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Abstract

The invention relates to the technical field of modification of biological high-molecular materials, and aims to provide a preparation method of a high-molecular PLA three-dimensional composite material capable of being crystallized rapidly. The high-molecular PLA three-dimensional composite material capable of being crystallized rapidly can be prepared by solution or melt blending of a PLA matrix and an organic metal phosphonate nucleating agent. According to the invention, three-dimensional composite crystallization of a high-molecular PLLA / PDLA (Poly L Lactic Acid / Poly-D-Lactic Acid) blend is promoted by adopting organic metal phosphonate; the homogeneous crystallization is inhibited; the three-dimensional composite crystallization speed and the crystallization degree of the blend are greatly increased; the three-dimensional composite crystallization degree can be above 40%; the processibility, the heat-resistant property and the mechanical property of the PLLA / PDLA blend are increased effectively; simultaneously, the solvent resistance and the degradation resistance of PLA are also improved.

Description

technical field [0001] The invention relates to the technical field of modification of bio-based polymer materials, in particular to a method for preparing a rapidly crystallizable high-molecular-weight polylactic acid stereocomplex material. Background technique [0002] Polylactic acid (PLA) is a typical biodegradable bio-based polymer material, which has good biodegradability, biocompatibility, processability, mechanical properties, etc., and has been widely used in biomedical engineering, packaging materials, Disposable plastic products, textile fibers, films and other fields. However, as a semi-crystalline thermoplastic polyester, PLA has a slow crystallization rate and low crystallinity, which seriously affects its processability and heat resistance, restricting the application of PLA in the industrial field. Stereoregular PLA has two optical isomers, namely L-polylactic acid (PLLA) and D-polylactic acid (PDLA). When PLLA and PDLA are blended, a stereocomplex crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K5/5357C08K5/5313
Inventor 潘鹏举韩理理单国荣包永忠
Owner ZHEJIANG UNIV
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