Micro-foamed plylactic acid material and preparation method thereof

A polylactic acid and micro-foaming technology, which is applied in the field of polylactic acid micro-foaming materials and its preparation, can solve problems such as low melt viscosity and melt strength, small number of molecular branched chains of PLA, and easy bursting of bubbles, etc., to achieve Uniform cell size, simple foaming process, and low material density

Inactive Publication Date: 2015-09-16
常州龙骏天纯环保科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still big problems in the foaming process of polylactic acid. The number of molecular branches of PLA is small, the melt viscosity and melt strength are low, the melt viscoelasticity is poor, and the pure PLA melt is more sensitive to temperature. , the melt viscosity decreases rapidly with the increase of temperature, all these factors lead to insufficient strength of the bubble wall film during foaming, the bubbles are easy to break, foam molding is difficult, and it is difficult to obtain high-magnification foam moldings

Method used

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  • Micro-foamed plylactic acid material and preparation method thereof
  • Micro-foamed plylactic acid material and preparation method thereof
  • Micro-foamed plylactic acid material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0016] The raw material components are:

[0017]

[0018] PLA and Antioxidant 1010 were vacuum-dried at 80°C for 12h and cooled in vacuum, and the PBS particles were dried in a common blast oven at 60°C for 12h. Mix PLA, PBS, BPO and antioxidant 1010 uniformly in a high-speed blender. Then use a co-rotating twin-screw extruder to extrude and granulate. The temperature of each section of the extruder screw is: 120°C, 155°C, 160°C, 165°C, 175°C, 165°C, 160°C, and the screw speed is 160rpm. The obtained modified polylactic acid particles were vacuum dried at 50° C. for 12 h. The obtained pellets were compression-molded in a flat vulcanizer to obtain a molded sample, and the molding temperature was 160°C. Pressure 5MPa, holding time 5min. The obtained sample is swelled in a supercritical carbon dioxide foaming kettle body, the swelling temperature is controlled to be 70°C, the swelling pressure is 15Mpa, the swelling time is 80min, and the pressure is released quickly, and t...

Embodiment 2

[0020] The raw material components are:

[0021]

[0022] PLA and Antioxidant 1010 were vacuum-dried at 80°C for 12h and cooled in vacuum, and the PBS particles were dried in a common blast oven at 60°C for 12h. Mix PLA, PBS, BPO and antioxidant 1010 uniformly in a high-speed blender. Then use a co-rotating twin-screw extruder to extrude and granulate. The temperature of each section of the extruder screw is: 125°C, 160°C, 165°C, 170°C, 180°C, 170°C, 165°C, and the screw speed is 170rpm. The obtained modified polylactic acid particles were vacuum dried at 50° C. for 12 h. The obtained pellets were compression-molded in a flat vulcanizer to obtain a molded sample, and the compression-molding temperature was 165°C. The pressure is 8MPa, and the holding time is 6min. Swell the obtained sample in a supercritical carbon dioxide foaming kettle body, control the swelling temperature to 80°C, the swelling pressure to 20Mpa, and the swelling time to 100min, and quickly release th...

Embodiment 3

[0024] The raw material components are:

[0025]

[0026] PLA and Antioxidant 1010 were vacuum-dried at 80°C for 12h and cooled in vacuum, and the PBS particles were dried in a common blast oven at 60°C for 12h. Mix PLA, PBS, BPO and antioxidant 1010 uniformly in a high-speed blender. Then use a co-rotating twin-screw extruder to extrude and granulate. The temperatures of each section of the extruder screw are: 120°C, 165°C, 170°C, 175°C, 185°C, 175°C, 170°C, and the screw speed is 180rpm. The obtained modified polylactic acid particles were vacuum dried at 50° C. for 12 h. The obtained pellets were compression-molded in a flat vulcanizer to obtain a molded sample, and the compression-molding temperature was 170°C. The pressure is 10MPa, and the holding time is 7min. Swell the obtained sample in a supercritical carbon dioxide foaming kettle body, control the swelling temperature to 90°C, the swelling pressure to 25Mpa, and the swelling time to 120min, and quickly release...

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Abstract

The invention discloses a micro-foamed plylactic acid material and a preparation method thereof. The disadvantages of high application cost, poor toughness, small quantity of molecular branched chains, unstable processing, easy molecular chain fracture, low melt viscosity and strength, and unfavourable foaming molding of polylactic acid are overcome in the invention. The method comprises the following steps: preparing a dibenzoyl peroxide tackified polydactyl acid / poly(butylene succinate) composite material through a melt blending technology, preparing a sample through compression molding, swelling the sample with supercritical carbon dioxide as a foaming agent, and rapidly releasing pressure to obtain the micro-foamed plylactic acid material. The preparation method has the advantages of low temperature foaming, high speed pressure relief, simple foaming process and short time, and the micro-foamed plylactic acid material prepared in the invention has the advantages of uniform cell dimension, large cell density and small material density.

Description

technical field [0001] The invention relates to a polylactic acid micro-foaming material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) has two major advantages of biodegradability and plant origin, and can be processed in various molding processes like other common petroleum-based polymers. Its foaming materials can be used in many fields such as cushioning packaging, heat insulation, agriculture, forestry and gardening, etc. Therefore, it is of great significance to study PLA foam materials. At present, there are still big problems in the foaming process of polylactic acid. The number of molecular branches of PLA is small, the melt viscosity and melt strength are low, the melt viscoelasticity is poor, and the pure PLA melt is more sensitive to temperature. , The melt viscosity decreases rapidly with the increase of temperature. All these factors lead to insufficient strength of the bubble wall film during foaming, easy rupture of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08K5/14C08K5/134C08K3/34C08J9/12
Inventor 支朝晖李炳健
Owner 常州龙骏天纯环保科技有限公司
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