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Entire biodegradation PLA/PBAT composite material and preparing method therefor

A composite material and raw material technology, applied in the field of fully biodegradable PLA/PBAT composite material and its preparation, can solve the problems of destroying the full biodegradable properties of the blend, difficulty in obtaining a composition with mechanical properties, and inconvenient addition and use. Improved interfacial compatibility, low manufacturing cost, and reduced preparation cost

Active Publication Date: 2014-03-12
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor compatibility between polylactic acid, starch, and aliphatic-aromatic copolyester, it is difficult to obtain a composition with better mechanical properties by simple blending.
The literature (Carbohydrate Polymers[J], 2009, 77:576–582) reported that the double bond in maleic anhydride was used to polymerize a polymer with good compatibility with polyester as a compatibilizer to compatibilize polylactic acid, Starch and aliphatic-aromatic ternary blends; however, the use of this compatibilizer has the disadvantage of not being biodegradable, thereby destroying the fully biodegradable properties of the blend
Although the use of isocyanate chain extenders as compatibilizers can also improve the compatibility of the three, but isocyanate chain extenders are more toxic on the one hand, and on the other hand they are mostly liquid, so it is inconvenient to add and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Dry PLA (weight-average molecular weight: 200,000), PBAT (weight-average molecular weight: 125,000), and thermoplastic cornstarch in a blast oven at 80°C for 10 hours, and dry talcum powder (1250 mesh) in a blast oven at 105°C Processing 8h;

[0038] (2) Then take 90 parts of PLA, 10 parts of PBAT, 10 parts of thermoplastic corn starch, 0.01 parts of compatibilizer A dicumyl peroxide, 0.1 parts of compatibilizer B maleic anhydride, and 2 parts of talcum powder in the high mixer Mix at room temperature for 5 minutes;

[0039] (3) Put the obtained mixture into a twin-screw machine for extrusion and granulation. The temperature of each zone of the twin-screw machine is: 150°C in the first zone, 160°C in the second zone, 160°C in the third zone, 170°C in the fourth zone, 170°C in the fifth zone, The sixth zone is 175°C, the seventh zone is 180°C, the eighth zone is 180°C, the ninth zone is 180°C, the tenth zone is 175°C, and the head is 175°C; the screw speed is 200rpm...

Embodiment 2

[0041] (1) Dry PLA (weight average molecular weight 300,000), PBAT (weight average molecular weight 28,000), thermoplastic tapioca starch in a blast oven at 60°C for 24 hours, and dry calcium carbonate (1250 mesh) in a blast oven at 110°C Processing 6h;

[0042] (2) Then take 60 parts of PLA, 40 parts of PBAT, 40 parts of thermoplastic tapioca starch, 0.5 parts of compatibilizer A dicumyl peroxide, 2 parts of compatibilizer B pyromellitic anhydride, and 20 parts of calcium carbonate in high temperature Mix in the mixer at room temperature for 5 minutes;

[0043] (3) Put the obtained mixture into a twin-screw machine for extrusion and granulation. The temperature of each zone of the twin-screw machine is: 150°C in the first zone, 160°C in the second zone, 160°C in the third zone, 170°C in the fourth zone, 170°C in the fifth zone, The sixth zone is 175°C, the seventh zone is 180°C, the eighth zone is 180°C, the ninth zone is 180°C, the tenth zone is 175°C, and the head is 175°C...

Embodiment 3

[0045](1) Dry PLA (weight average molecular weight 100,000), PBAT (weight average molecular weight 100,000), and thermoplastic wheat starch in a blast oven at 60°C for 24 hours, and kaolin (1250 mesh) in a blast oven at 110°C 10h;

[0046] (2) Then take 10 parts of PLA, 90 parts of PBAT, 40 parts of thermoplastic wheat starch, 1.4 parts of compatibilizer A dicumyl peroxide, 10 parts of compatibilizer B citric acid, and 40 parts of kaolin in a high mixer at room temperature Mix for 5 minutes;

[0047] (3) Put the obtained mixture into a twin-screw machine for extrusion and granulation. The temperature of each zone of the twin-screw machine is: 150°C in the first zone, 160°C in the second zone, 160°C in the third zone, 170°C in the fourth zone, 170°C in the fifth zone, The sixth zone is 175°C, the seventh zone is 180°C, the eighth zone is 180°C, the ninth zone is 180°C, the tenth zone is 175°C, and the head is 175°C; the screw speed is 200rpm, and the length-to-diameter ratio L...

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Abstract

The invention belongs to the technical field of polymer materials, and relates to an entire biodegradation PLA / PBAT composite material and a preparing method therefor. The composite material comprises, by weight, 10-90 parts of polylactic acid, 10-90 parts of poly(butylene adipate-co-butylene terephthalate)ester, 10-80 parts of thermoplastic starch, 0.01-1.5 parts of compatilizer A, 0.1-10 parts of compatilizer B, and 1-40 parts of filling materials. The preparing method and an operation process for the composite material are simple, product manufacturing cost is relatively low, the composite material has excellent mechanical properties, is of excellent flexibility, is entirely biodegradable, and can be widely used in the field of consumer products such as packaging materials and disposable tableware.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a fully biodegradable PLA / PBAT composite material and a preparation method thereof. Background technique [0002] The use of plastic film has penetrated into all areas of people's lives, and is widely used as food packaging, electronic and electrical product packaging, shopping bags, garbage bags, etc. The raw materials of traditional plastic film materials such as polypropylene (PP) film and polyethylene (PE) film are petroleum, which are difficult to degrade when discarded in nature after use, causing great harm to the environment. With the depletion of petroleum resources and the continuous enhancement of people's awareness of environmental protection, the development of fully degradable environmentally friendly polymer materials used in the field of thin film materials will become the mainstream of future development. [0003] Polylactic acid (PLA) is an aliphatic po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08L3/02C08K13/02C08K3/26C08K3/34C08K3/36C08K5/14C08K5/1539C08K5/092B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/625B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92904
Inventor 袁角亮
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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