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Biodegradable composite and preparation method thereof

A composite material and biodegradable technology, applied in the field of biodegradable composite materials and their preparation, can solve the problems of increased production cost, difficult preparation, and easy precipitation

Active Publication Date: 2015-11-25
深圳新诺包装制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Plasticizers need to be added to the PLA-PBAT biodegradable film to improve the flexibility and elongation at break of the product. At present, liquid plasticizers are usually used. Due to the large amount of liquid plasticizers, after mixing with PLA and PBAT pellets It cannot be absorbed and is easy to precipitate, so it is necessary to install a liquid feeding system on the extruder, which makes the preparation more difficult and increases the production cost

Method used

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  • Biodegradable composite and preparation method thereof
  • Biodegradable composite and preparation method thereof
  • Biodegradable composite and preparation method thereof

Examples

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preparation example Construction

[0026] The preparation method of the above-mentioned biodegradable composite material comprises the following steps:

[0027] Step S110, drying the polylactic acid and polybutylene adipate-terephthalate.

[0028] In this step, polylactic acid and polybutylene adipate-terephthalate are dried at 60° C. to 100° C. for 2 to 10 hours.

[0029] Preferably, the drying treatment adopts a vacuum oven or a blast drying oven.

[0030] Step S120, mix polylactic acid, polybutylene adipate-terephthalate, compatibilizer, liquid plasticizer and solid plasticizer evenly, then add them into an extruder, extrude and granulate to obtain a biodegradable composite material .

[0031] Preferably, polylactic acid, polybutylene adipate-terephthalate, compatibilizer, liquid plasticizer and solid plasticizer are added into a mixer and stirred at high speed for mixing.

[0032] Preferably, a twin-screw extruder is used for extrusion granulation, the temperature of the twin-screw extruder is 120°C-190°...

Embodiment 1

[0045] Place PLA and PBAT in an air-blast drying oven at 80°C for 4 hours, and then weigh the raw materials of each component according to the following parts by mass:

[0046]

[0047]Stir the above-mentioned raw materials uniformly at room temperature in a high-speed mixer, and then add the obtained mixture into twin-screws to extrude and granulate. The temperature of the twin-screw extruder is: zone 1 135°C, zone 2 165°C, zone 3 175°C, zone 4 185°C, zone 5 185°C, zone 6 185°C, zone 7 175°C, head temperature 165°C, screw The speed is 200rpm, and the aspect ratio is 40:1. Dry the pellets granulated by the extruder in an air-blast drying oven at 80°C for 4 hours, and then extrude and blow the film through a single-screw extruder. The temperatures of the three temperature zones of the blown film machine are: 150°C, 160°C ℃, 170℃, inflation ratio 2.5:1.

Embodiment 2

[0049] PLA and PBAT were dried in an air-dried oven at 80°C for 5 hours, and then the raw materials of each component were weighed according to the following parts by mass:

[0050]

[0051] Stir the above-mentioned raw materials uniformly at room temperature in a high-speed mixer, and then add the obtained mixture into twin-screws to extrude and granulate. The temperature of the twin-screw extruder is: zone 1 125°C, zone 2 170°C, zone 3 175°C, zone 4 185°C, zone 5 185°C, zone 6 185°C, zone 7 175°C, head temperature 165°C, screw The speed is 250rpm, and the aspect ratio is 36:1. Dry the pellets granulated by the extruder in an 80°C blast drying oven for 5 hours, and then extrude and blow the film through a single-screw extruder. The temperatures of the three temperature zones of the blown film machine are: 145°C, 160°C ℃, 170℃, inflation ratio 3:1.

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Abstract

The invention relates to biodegradable composite and a preparation method thereof. The biodegradable composite comprises components in parts by mass as follows: 25-70 parts of polylactic acid, 20-65 parts of poly(butylene adipate-butylene terephthalate), 0.5-2.0 parts of a compatilizer, 0-5 parts of a liquid plasticizer and 5-15 parts of a solid plasticizer, wherein the liquid plasticizer is at least one of tributyl citrate, acetyl tributyl citrate, epoxidized soybean oil, polyethylene glycol-200, polyethylene glycol-300, polyethylene glycol-400 and polyethylene glycol-500; the solid plasticizer is at least one of polyethylene glycol-1500, polyethylene glycol-2000, polyethylene glycol-3000, polyethylene glycol-4000, polyethylene glycol-6000, polyethylene glycol-8000, polyethylene glycol-10000 and polyethylene glycol-20000. The biodegradable composite has higher elongation at break and is easier to prepare.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a biodegradable composite material and a preparation method thereof. Background technique [0002] Degradable films not only have the functions and characteristics of traditional plastics, but also can be split and degraded in the natural environment through the action of microorganisms in soil and water or ultraviolet rays in sunlight after reaching the end of their service life, and finally re-enter the ecology in a reduced form. environment, back to nature. With the enhancement of people's awareness of environmental protection, biodegradable materials have been widely used. [0003] Biodegradable film (PLA-PBAT biodegradable film) with polylactic acid (PLA, PolyLacticAcid) and polyadipate-butylene terephthalate (PBAT, poly(butylene-adipate-co-terephthalate)) as the main substrate ) is one of the most researched biodegradable films. Plasticizers need to be added to...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L67/02C08L71/00C08L91/00C08L23/08C08L35/06B29C47/92B29C48/92
Inventor 熊平栗国民汪学文牛准
Owner 深圳新诺包装制品有限公司
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