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A kind of biodegradable composite bead foam material and preparation method thereof for packaging field

A technology of biodegradation and bead foaming, applied in packaging, wrapping paper, biological packaging, etc., can solve the problems of low foaming ratio, toxic foaming agent, expensive nucleating agent, etc., and achieve foaming saturation time The effect of short length, improved production efficiency, and simple method

Active Publication Date: 2022-06-24
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN102229707A provides the composition and preparation method of PBAT molded foaming material, but only PBAT is used for foaming, and the board after molding is very soft, which is not suitable for packaging materials; patent CN112940468 A provides a polylactic acid-based foamed particle and its preparation method, but it needs to add nucleating agent in its foaming material and process method, just can reach better foaming effect, and nucleating agent can produce adverse influence to environment, and some nanoscale nucleating agents are expensive; Patent CN111320845A provides A graphene-enhanced and toughened PBAT / PLA composite material foaming method has been developed, but the steps of adding graphene are complicated and expensive, and the method of still pressure foaming is adopted, which makes polyester biodegradable materials such as PLA and PBAT work at high temperature. In the case of water heat, hydrolysis and depolymerization are very likely to occur, which will adversely affect the performance of the final product; patent CN101613486A adopts molded foaming, and uses N 2 The method of preparing PBAT foam as a foaming agent, but the foaming ratio is very low; the patent CN108003584A adopts the method of chemical foaming, the foaming ratio is low, and the residual AC foaming agent is toxic

Method used

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  • A kind of biodegradable composite bead foam material and preparation method thereof for packaging field
  • A kind of biodegradable composite bead foam material and preparation method thereof for packaging field
  • A kind of biodegradable composite bead foam material and preparation method thereof for packaging field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Take 70 ℃, after drying for 10h (80% by weight), low crystallinity PLA-LX175 (18% by weight), compatibilizer ADR-4468 (weight fraction 2%), extruded in a twin-screw underwater pelletizing extruder, which contains nine temperature zones, 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 temperature 230°C, screw speed 80 rpm; pelletizer speed 1500 rpm / min, cut into 5 mg particles.

[0036] (2) The obtained particles are placed in a supercritical molding foaming machine to ensure that the total volume of the particles does not exceed 1 / 3 (3000 cm) of the container volume. 3 ), at 20MPa supercritical CO2 As a foaming agent, it was saturated at 115 °C for 10 min, and the pressure was released at a rate of 20 MPa / s to obtain a biodegradable composite foamed material.

[0037] figure 1 It is a comparison diagram of the obtained particles before and after foaming in Example 1 (that is, the particles obtai...

Embodiment 2

[0044] Take 70 ℃, after drying for 10h (70% by weight), low crystallinity PLA-LX175 (27% by weight), compatibilizer (3% by weight), 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 temperature 230°C, screw speed 80 rpm; pelletizer speed is 1500 rpm / min twin-screw underwater pelletizing extruder, cut into 5mg pellets .

[0045] The obtained particles are placed in a supercritical molding foaming machine to ensure that the total volume of the particles does not exceed 1 / 3 (3000cm) of the container volume. 3 ), with a total of 20MPa supercritical N 2 and supercritical CO 2 The composite gas is a blowing agent, and its supercritical N 2 and supercritical CO 2 The ratio is 1:3, and the biodegradable composite foam material is obtained by saturating for 10 min at 115 °C, and releasing the pressure at a rate of ...

Embodiment 3

[0051] Take 70 ℃, after drying for 10h (90% by weight), low crystallinity PLA-LX175 (8% by weight), compatibilizer ADR-4468 (weight fraction 2%), extruded in a twin-screw underwater pelletizing extruder, which contains nine temperature zones, 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 temperature 230°C, screw speed 80 rpm; pelletizer speed 1500 rpm / min twin-screw underwater pelletizing extruder, cut into 5mg of particles.

[0052] The obtained particles are placed in a supercritical molding foaming machine to ensure that the total volume of the particles does not exceed 1 / 3 (3000cm) of the container volume. 3 ), with a total of 15MPa of supercritical N 2 and supercritical CO 2 The composite gas is a blowing agent, and its supercritical N 2 and supercritical CO 2 The ratio is 1:3, and the biodegradable composite foam material is obtained by saturating for 30 min at 110 °C and releasing the pressure ...

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Abstract

The invention discloses a biodegradable composite bead foaming material oriented to the packaging field and a preparation method thereof. The blend is prepared from a material containing polybutylene adipate terephthalate and polylactic acid with low crystallinity. The particles are placed in a high-pressure mold, and the foaming gas is used as a foaming agent for molding and foaming. The invention adopts the composite method of PLA with low crystallinity and PBAT, and can produce good foaming effect without adding nucleating agent.

Description

technical field [0001] The invention relates to the field of biodegradable polymer materials, in particular to a biodegradable composite bead foaming material oriented to the packaging field and a preparation method thereof. Background technique [0002] Polymer foam material is a polymer / gas composite material based on high polymer, which has the advantages of low cost, light weight, high impact strength, good heat insulation and sound insulation, etc., so it is widely used in packaging, construction, electrical appliances and other fields. The polymer products are mostly derived from fossil fuels and become non-degradable waste in the environment. The landfill volume of massive foam waste has become a serious global problem. Therefore, the world is working hard to create green polymers using renewable resources, and at the same time, today's society is paying more and more attention to environmental protection. [0003] Biodegradable foam materials such as poly(butylene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/18C08J9/12C08J9/14C08L67/02C08L67/04B65D65/46
CPCC08J9/18C08J9/122C08J9/0061C08J9/141B65D65/466C08J2367/02C08J2467/04C08J2203/08C08J2203/06C08J2203/182C08J2203/14C08J2201/032Y02W90/10
Inventor 朱晨杰龙浩宇梁国伟庄伟梁国超肖红杰李明欧阳平凯
Owner NANJING TECH UNIV
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