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Biodegradable composite bead foaming material for packaging field and preparation method of biodegradable composite bead foaming material

A biodegradable and bead foaming technology, used 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, improved production efficiency and simple method

Active Publication Date: 2021-11-05
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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  • Biodegradable composite bead foaming material for packaging field and preparation method of biodegradable composite bead foaming material
  • Biodegradable composite bead foaming material for packaging field and preparation method of biodegradable composite bead foaming material
  • Biodegradable composite bead foaming material for packaging field and preparation method of biodegradable composite bead foaming material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) After drying at 70°C for 10 hours (weight fraction 80%), low crystallinity PLA-LX175 (weight fraction 18%), compatibilizer ADR-4468 (weight fraction 2%) 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 5mg particles.

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

[0037] figure 1 It is the comparison chart before and after the foaming of the particles obtained in Example 1 (i.e. the p...

Embodiment 2

[0044] After drying at 70°C for 10 hours (weight fraction 70%), low crystallinity PLA-LX175 (weight fraction 27%), 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 head temperature 230°C, screw speed 80 rpm; pelletizer speed 1500 rpm in a twin-screw underwater pelletizing extruder, cut into 5 mg particles .

[0045] The particles obtained are placed in a supercritical foaming machine to ensure that the total volume of the particles does not exceed 1 / 3 of the volume of the container (3000cm 3 ), with a total amount 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, saturated at 115°C for 10 minutes, and the pressure is released at a rate of 20MPa / s to obtain a biodegradable...

Embodiment 3

[0051] After drying at 70°C for 10 hours (weight fraction 90%), low crystallinity PLA-LX175 (weight fraction 8%), compatibilizer ADR-4468 (weight fraction 2%) 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 in a twin-screw underwater pelletizing extruder, cut into 5 mg of particles.

[0052] The particles obtained are placed in a supercritical foaming machine to ensure that the total volume of the particles does not exceed 1 / 3 of the volume of the container (3000cm 3 ), with a total amount of 15MPa 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, saturated at 110°C for 30 minutes, and the pressure is released at a rate of 20MPa / s to obta...

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Abstract

The invention discloses a biodegradable composite bead foaming material for the packaging field and a preparation method of the biodegradable composite bead foaming material; blended particles prepared from materials containing poly(butylene adipate-co-terephthalate) and low-crystallinity polylactic acid are placed in a high-pressure mold, and a foaming gas is used as a foaming agent for mold pressing foaming. A low-crystallinity PLA and PBAT compounding method is adopted, and a good foaming effect can be achieved without adding a nucleating agent.

Description

technical field [0001] The invention relates to the field of biodegradable polymer materials, in particular to a biodegradable composite bead foam material for 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, and is widely used in packaging, Construction, electrical appliances and other fields. Polymer products are mostly derived from fossil fuels and become non-degradable waste in the environment. Landfilling of large amounts of foam waste has become a serious global problem. As a result, global efforts are being made to create green polymers from renewable resources, and at the same time, environmental protection is becoming increasingly important in today's society. [0003] Biodegradable foaming materials such as polybutylene adipate / terep...

Claims

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Application Information

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Patent Type & Authority Applications(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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