A kind of macromolecular nucleating agent for rapid crystallization of polylactic acid and using method thereof

A technology of macromolecules and nucleating agents, applied in the field of macromolecular nucleating agents, can solve the problems of degradability and partial mechanical properties of polylactic acid resin, low crystallinity of polylactic acid, influence of polylactic acid performance, etc. Value and commercial prospects, effect of low degradability, low investment in processing equipment

Active Publication Date: 2021-10-26
ANHUI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nucleation effect is not good, and only when the hyperbranched polyester amide content is above 10%, can the obvious nucleation effect be observed from the optical microscope (Macromolecules 2007,40,6257-6267)
[0005] Chinese Invention Patent Authorization Announcement No. CN103102661B discloses a rapid nucleating agent for polylactic acid resin. Although the agent has the effect of promoting the nucleation of polylactic acid and reducing the crystallization time, it needs to increase its nucleating performance by increasing the dosage. The best nucleating agent dosage is as high as 10%. Low; the economic benefit of the product is poor
Moreover, since the nucleating agent itself will affect the performance of polylactic acid, the degradability and some mechanical properties of polylactic acid resin will also be significantly reduced after a large amount of addition.

Method used

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  • A kind of macromolecular nucleating agent for rapid crystallization of polylactic acid and using method thereof
  • A kind of macromolecular nucleating agent for rapid crystallization of polylactic acid and using method thereof
  • A kind of macromolecular nucleating agent for rapid crystallization of polylactic acid and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0044] Preparation of bio-based polyamide polymers:

[0045] (1) Add 100g of undecylenic acid methyl ester and 1g of 1,3-diamino-propanol into 4ml of tetrahydrofuran; after passing through argon for half an hour, place it in an oil bath at 40°C, add 10ml of sodium methoxide, React at 40°C for 20 hours, and then recrystallize to obtain a white powdery solid, which is the desired functional polyamide monomer 1;

[0046] (2) Take 54g of functional polyamide monomer A, 12g of butyric anhydride, and 40mg of dimethylaminopyridine in a round-bottomed flask, add 3ml of tetrahydrofuran to mix, and react at 50°C for 10 hours to obtain a clear solution. The functional polyamide obtained after purification Amide monomer 2;

[0047](3) 1350mg of functional polyamide monomer 2, 150mg of functional polyamide monomer 1, 200mg of oxadithiol, and 10mg of azobisisobutyronitrile catalyst and 10ml of tetrahydrofuran are added to the reaction vessel; After that, the mixture was placed in an oil b...

Embodiment 1

[0052] 1) Dry 100 parts of polylactic acid in a vacuum oven at 40°C for 12 hours for subsequent experiments;

[0053] 2) Add 100 parts of polylactic acid obtained in step 1) into an internal mixer, and blend for 3 minutes at a temperature of 160° C. at a speed of 40 revolutions per minute to mix the various materials uniformly to obtain Polylactic acid resin.

[0054] The polylactic acid resin obtained in Example 1 was subjected to an isothermal crystallization test, and the relationship between the heat flow and the crystallization time of the isothermal crystallization at 115° C. in Example 1 was as follows figure 1 Shown, embodiment 1 in 120 ℃ isothermal crystallization heat flow and crystallization time relation are as follows figure 2 Shown, the crystallinity and crystallization time relation of embodiment 1 at 120 ℃ isothermal crystallization are as follows image 3 shown.

Embodiment 2

[0056] 1) Dry 99.5 parts of polylactic acid and 0.5 parts of macromolecular nucleating agent in a vacuum oven at 100°C for 4 hours for subsequent experiments;

[0057] 2) Mix 99.5 parts of polylactic acid and 0.5 parts of macromolecular nucleating agent in the pretreatment material obtained in step 1) and add them to the internal mixer. Mix various materials uniformly in 20 minutes to obtain rapid crystallization polylactic acid resin.

[0058] The rapid crystallization polylactic acid resin obtained in Example 2 is subjected to an isothermal crystallization test, and the relationship between the heat flow and the crystallization time of the isothermal crystallization at 115°C in Example 2 is as follows figure 1 Shown, embodiment 2 is in 120 ℃ of isothermal crystallization heat flow and crystallization time relation as follows figure 2 Shown, the crystallinity and crystallization time relation of embodiment 2 at 120 ℃ isothermal crystallization are as follows image 3 shown...

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Abstract

The invention belongs to the technical field of polymer materials, and in particular relates to a macromolecular nucleating agent for rapid crystallization of polylactic acid and a use method thereof. The structural formula of the macromolecular nucleating agent is: 5≤n≤5000; wherein, the R 1 and R 3 is an aliphatic main chain structure; R 2 is a side chain structure with an ester functional group, R 4 It has a main chain structure with thioether. The macromolecular nucleating agent can be added to the polylactic acid matrix in an amount of 0-2wt%, and the polylactic acid can be rapidly crystallized by melt blending or solution blending to prepare the polylactic acid resin. The macromolecular nucleating agent can greatly increase the crystallization rate of polylactic acid on the basis of a small amount of addition. The amount of nucleating agent added in the polylactic acid matrix is ​​small, and the compatibility and dispersion between the nucleating agent itself and the polylactic acid matrix are better, so the use of nucleating agent has a great influence on the mechanical properties and Processing characteristics are less affected.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a macromolecular nucleating agent for rapid crystallization of polylactic acid and a use method thereof. Background technique [0002] With the increasingly serious problems of environmental pollution and petrochemical resource depletion, the research and development of bio-based materials using natural biomass as raw materials has become a research hotspot in the field of materials in the world today. Polylactic acid has the advantages of good processability, biodegradability and environmental friendliness, so it is considered to be a polymer material that can effectively reduce waste pollution on the earth. However, polylactic acid is not perfect. It has shortcomings such as slow crystallization speed and low heat distortion temperature. These shortcomings greatly limit the pace of polylactic acid replacing traditional plastics. [0003] During the synthe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/44C08L67/04C08L77/12
CPCC08G69/44C08L67/04C08L2205/24C08L77/12
Inventor 章亚琼汪钟凯郑素华周江骏何悦然
Owner ANHUI AGRICULTURAL UNIVERSITY
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