Lignin-containing biodegradable polyester compound bead foaming material with high crystallization rate and preparation method thereof

A biodegradable polyester and bead foaming technology, applied in the field of biodegradable polymer materials, can solve the problems of low foaming ratio, low crystallization speed, and performance degradation of plastic products, so as to widen the foaming range and improve the foaming rate. Foam performance, effect of increasing crystallization rate

Active Publication Date: 2021-12-03
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the bead steam forming process, if the crystallization rate is low, it is not conducive to the diffusion and recrystallization of the bead interface domain chain, which affects the formability of the product
At present, the nucleating agents for biodegradation on the market can be divided into three categories: inorganic material nucleating agents, organic compound nucleating agents, salts and polymer material nucleating agents, but these nucleating agents have poor compatibility , It is easy to cause the performance degradation or instability of plastic products, which limits its application range, and these nucleating agents will have an adverse impact on the environment, and some nano-scale nucleating agents are expensive; the nucleating agents are highly efficient, green, Harmless, the development of bio-based non-toxic nucleating agents is also one of the main directions for future development
[0004] The melting point difference between PBAT and PLA composite materials is large, which will lead to no suitable foaming temperature range. The poor compatibility of PBAT / PLA will cause the foaming gas to escape during the foaming process, resulting in low foaming ratio and foaming. Inhomogeneous pore size, merging and collapse of cells, at present, the compatibility can be effectively improved by chain extenders, but the compatibility between the two still needs to be further improved
For example, the patent CN111320845A provides a graphene-enhanced and toughened PBAT / PLA composite material foaming method, using graphene as its nucleating agent, these nucleating agents improve the foaming performance of biodegradable polyester, and increase the disadvantage of cost Influence; moreover, it adopts the method of autoclave pressure foaming, which makes PLA, PBAT and other polyester biodegradable materials prone to hydrolysis and depolymerization under the condition of high temperature water heat, which will adversely affect the performance of the final product

Method used

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  • Lignin-containing biodegradable polyester compound bead foaming material with high crystallization rate and preparation method thereof
  • Lignin-containing biodegradable polyester compound bead foaming material with high crystallization rate and preparation method thereof
  • Lignin-containing biodegradable polyester compound bead foaming material with high crystallization rate and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) After drying at 70°C for 10 hours MAH (10 parts) and DCP (3 parts) are melt blended in a twin-screw extruder, which contains five temperature zones, and the temperatures from zone 1 to zone 5 are 130°C, 135°C, 140°C, 135°C and 130°C , the extrusion twin-screw speed is 80rpm; this process is repeated three times, and the coarse MAH-g-PBAT particles are obtained after being pelletized by a pelletizer; the thick MAH-g-PBAT particles are dissolved in methylene chloride until completely dissolved, and the solution After being clear, it is then poured into excess ultrapure water for precipitation to remove unreacted maleic anhydride (MAH) and dicumyl peroxide (DCP), and the resulting precipitate is MAH with a grafting ratio of 1.24 after purification -g-PBAT masterbatch;

[0051] (2) Dry PLA-LX175 (30 parts) at 70°C for 10 hours, MAH-g-PBAT masterbatch (6 parts), kraft lignin with a particle size of 2 μm (20 parts), chain extender ADR-4468 (2 parts) is extruded in...

Embodiment 2

[0075] The preparation method of MAH-g-PBAT masterbatch is identical with embodiment 1. After drying at 70°C for 10 hours PLA-LX175 (30 parts), MAH-g-PBAT masterbatch (6 parts), kraft lignin with a particle size of 2 μm (10 parts), chain extender ADR-4468 (2 parts) is extruded in a twin-screw underwater pelletizing extruder, which contains nine temperature zones, and the temperatures from zone one to zone nine are 155°C, 180°C, 180°C, 185°C, 185°C, 190°C, 190°C, 185°C, 190°C, die head temperature 230°C, screw speed 80 rpm; pelletizer speed 1500 rpm, cut into 5 mg pellets.

[0076] Place the obtained granules in a supercritical foaming machine to ensure that the total volume of the granules does not exceed 1 / 3 of the volume of the container (3000cm 3 ), with 20MPa supercritical CO 2 As a foaming agent, it is saturated at 112°C for 10 minutes, and the pressure is released at a rate of 20 MPa / s to obtain a biodegradable composite foaming material.

Embodiment 3

[0078] The preparation method of MAH-g-PBAT masterbatch is identical with embodiment 1. After drying at 70°C for 10 hours PLA-LX175 (30 parts), MAH-g-PBAT masterbatch (6 parts), kraft lignin with a particle size of 2 μm (40 parts), chain extender ADR-4468 (2 parts) is extruded in a twin-screw underwater pelletizing extruder, which contains nine temperature zones, and the temperatures from zone 1 to zone 9 are 155°C, 180°C, 180°C, 185°C, 185°C, 190°C, 190°C, 185°C, 190°C, die head temperature 230°C, screw speed 80 rpm; pelletizer speed 1500 rpm, cut into 5 mg pellets.

[0079] Place the obtained granules in a supercritical foaming machine to ensure that the total volume of the granules does not exceed 1 / 3 of the volume of the container (3000cm 3 ), with 20MPa supercritical CO 2 As a foaming agent, it is saturated at 112°C for 10 minutes, and the pressure is released at a rate of 20 MPa / s to obtain a biodegradable composite foaming material.

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Abstract

The invention discloses a lignin-containing biodegradable polyester compound bead foaming material with a high crystallization rate and a preparation method thereof, the preparation method comprises the following steps: (1) melting and blending poly (butylene adipate terephthalate), an anhydride compound and a peroxide cross-linking agent to obtain MAH-g-PBAT particles; (2) carrying out blending granulation on the particles, degradable resin, lignin and a chain extender to obtain biodegradable polyester compound beads; and (3) putting the biodegradable polyester composite beads into a high-pressure mold, and carrying out mold pressing foaming by taking foaming gas as a foaming agent, thereby obtaining the biodegradable polyester composite beads. The MAH-g-PBAT and the chain extender can synergistically improve the compatibility of PBAT, PLA and lignin, promote chain branching and chain intertwining, successfully combine two melting points into one melting point, broaden the foaming interval, improve the foaming performance and facilitate steam forming of beads.

Description

technical field [0001] The invention relates to the field of biodegradable polymer materials, in particular to a biodegradable polyester composite bead foam material containing lignin with high crystallization rate and a preparation method thereof. Background technique [0002] Biodegradable foaming materials such as polybutylene adipate terephthalate (PBAT), polylactic acid (PLA) and various composite materials have good thermal stability and mechanical properties, and are the solution to the problem of "plastic" The important way of "white pollution", especially in the field of foam materials such as packaging, cushioning, heat insulation and sound insulation, has attracted more and more attention; however, at present, biodegradable plastics such as PBAT and PLA are not available compared with traditional PS, PP, etc. For degradable plastics, the market price is expensive, and large-scale application is hindered. [0003] Both PBAT and PLA are crystalline polymers, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/18C08J9/12C08L67/02C08L67/04C08L51/08C08L97/00
CPCC08J9/18C08J9/122C08J9/0061C08J2203/06C08J2203/08C08J2367/02C08J2467/04C08J2451/08C08J2497/00
Inventor 朱晨杰龙浩宇庄伟梁国伟高婉琴梁国超肖红杰翟国强李明应汉杰欧阳平凯
Owner NANJING UNIV OF TECH
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