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Starch-based biodegradable PBAT modified material and preparation method thereof

A modified material, starch-based technology, used in biological packaging, climate sustainability, sustainable manufacturing/processing, etc., can solve problems such as feeding difficulties, sticky materials, etc., to improve processing efficiency and quality stability. Effect

Active Publication Date: 2022-05-17
WANHUA CHEMICAL (NINGBO) CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The introduction of liquid plasticizer water through water-absorbent resin effectively avoids the problems of agglomeration, wall sticking, and bridging after directly mixing native starch with traditional liquid plasticizers, resulting in difficult feeding
The greater advantage of the present invention is that the plasticizer water is used to replace traditional oil plasticizers such as glycerin, ethylene glycol, and sorbitol. Precipitation during shelf-life storage causes stickiness of the material

Method used

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  • Starch-based biodegradable PBAT modified material and preparation method thereof
  • Starch-based biodegradable PBAT modified material and preparation method thereof
  • Starch-based biodegradable PBAT modified material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047](1) First weigh 50g of water-absorbent resin (30 mesh), add 4L of pure water, stir evenly and let it stand for 5 minutes, filter the above solution through a filter to remove excess water, and obtain 3kg of saturated water-absorbent resin particles with a water absorption rate of 60; Add 3kg of water-absorbing resin granules and 15kg of native starch powder (corn starch) into a MIXER mixer, stir at a stirring speed of 600rpm / min for 4min and mix evenly to obtain a modified starch mixture;

[0048] (2) Add the above-mentioned modified starch mixture into the twin-screw extruder through the main feeding method, use the front-end screw of the twin-screw to shear, mix and plasticize, and the water squeezed from the water-absorbing resin can plasticize the starch well, and then Add 79kg of PBAT resin and 3kg of PLA resin and 0.1kg of slippery agent (erucamide), 0.2kg of anti-blocking agent (talcum powder) and plasticized starch to shear and mix evenly, and vacuumize at the end...

Embodiment 2

[0050] (1) First weigh 62.5g of water-absorbent resin (60 mesh), add 6L of pure water, stir evenly and let it stand for 5 minutes, filter the above solution through a filter device to remove excess water, and obtain 5kg of saturated water-absorbent resin particles with a water absorption rate of 80; Add 5kg of water-absorbing resin particles and 20kg of native starch powder (corn starch) into a MIXER mixer, stir at a stirring speed of 600rpm / min for 4min and mix evenly to obtain a modified starch mixture;

[0051] (2) Add the above-mentioned modified starch mixture into the twin-screw extruder through the main feeding method, use the front-end screw of the twin-screw to shear, mix and plasticize, and the water squeezed from the water-absorbing resin can plasticize the starch well, and then Add 70kg PBAT resin and 5kg PLA resin and 0.15kg smooth agent (erucamide), 0.3kg opening agent (talcum powder) and plasticized starch by side feeding and mix evenly, and vacuumize at the end ...

Embodiment 3

[0053] (1) First weigh 58.3g of water-absorbent resin (120 mesh), add 8L of pure water, stir evenly and let it stand for 5 minutes, filter the above solution through a filter device to remove excess water, and obtain 7kg of saturated water-absorbent resin particles with a water absorption rate of 120; Add 7kg of water-absorbing resin granules and 25kg of native starch powder (tapioca starch) into a MIXER mixer, stir at a stirring speed of 600rpm / min for 4min and mix evenly to obtain a modified starch mixture;

[0054] (2) Add the above-mentioned modified starch mixture into the twin-screw extruder through the main feeding method, use the front-end screw of the twin-screw to shear, mix and plasticize, and the water squeezed from the water-absorbing resin can plasticize the starch well, and then Add 62kg PBAT resin and 6kg PLA resin and 0.2kg smooth agent (erucamide), 0.4kg opening agent (calcium carbonate) and plasticized starch to shear and mix evenly, and vacuumize at the end ...

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Abstract

The invention provides a starch-based biodegradable PBAT modified material and a preparation method thereof. The modified material comprises the following components: PBAT resin, PLA resin, modified starch, a slipping agent and an anti-blocking agent. Liquid plasticizer water is introduced in a water-absorbent resin mode, and the problem that feeding is difficult due to caking, wall sticking and bridging after native starch and a traditional liquid plasticizer are directly mixed is effectively solved. Moreover, the plasticizing degree of the starch is reduced by pumping out part of water, and the starch recovers an ordered crystal structure, so that the starch is uniformly dispersed, the PBAT material is obviously enhanced, and meanwhile, the problem that the material is sticky due to precipitation of traditional plasticizers such as glycerol is avoided.

Description

technical field [0001] The invention belongs to the field of degradable plastics, in particular to a starch-based biodegradable PBAT modified material with high strength, anti-stickiness and low precipitation and a preparation method thereof. Background technique [0002] Traditional plastics are widely used in various fields because of their excellent comprehensive properties, good processability and low cost, such as polyethylene (PE), polypropylene (PP) and polystyrene (PS) and other plastics. The invention and use of plastics have brought great convenience to people's daily life, such as disposable plastic products such as plastic bags, plastic tableware, plastic straws, and agricultural mulch. 200-400 years, some up to 500 years, not only causing soil pollution, but also polluting air and water, causing huge environmental safety hazards. Therefore, the control of white pollution has become a global focus. Fully biodegradable plastics can degrade quickly in the natural...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L67/04C08L33/02C08L3/02B29B9/06
CPCC08L67/02B29B9/06C08L2201/06C08L67/04C08L33/02C08L3/02Y02W90/10
Inventor 李保印黄建王倩倩詹佐民李熠宇花月庆祁先勇陈连清王乔夫
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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