Degradable PLA film material and preparation method thereof

A film material, PLA technology, applied in the field of degradable PLA film material and its preparation, can solve the problems of less than 20 minutes of service life and limit the application of degradable film, and achieve the effect of improving production efficiency and convenience

Active Publication Date: 2018-07-13
上海德亿化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes how it works for create films that are resistant against damage caused during handling. It involves optimizing the heat used when melting plastic resins at temperatures between 20-25°C without making them harden quickly enough. By doing this, they improve their manufacturing processes while also improving their usability. Additionally, there're some ways to modify certain properties such as mechanical characteristics (strength) beforehand. Overall, this innovative method allows for more efficient use of resources and increased flexibility in producing different types of products from those made up of durably protected layers.

Problems solved by technology

This technical problem addressed by this patented innovative new type of polyester (PLA) that combines good mechanical performance together with excellent thermal stability during use without requiring long periods after being discarded downwardly through landfill operations due to its lacking decomposition over time.

Method used

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  • Degradable PLA film material and preparation method thereof
  • Degradable PLA film material and preparation method thereof
  • Degradable PLA film material and preparation method thereof

Examples

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preparation example Construction

[0052] A preparation method of degradable PLA film material, comprising the following steps:

[0053] (1): Put 1-100 parts of polylactic acid into the screw extruder 1, the aspect ratio L / D of the twin-screw extruder 1: 36-48, the operating temperature is 120-200°C, and the screw speed is 50 -400rpm, shear melting to form a fluid hot melt.

[0054] (2): Put 1-50 parts of molecular chain modifier and 0-10 parts of degradation agent into the second screw extruder. The operating temperature of the second screw extruder is 130-260 ° C. Fluid hot melt 2, under the action of high-speed heat exchange and strong shearing of the threaded element, the molecular chain modifier is partially degraded by a degradation agent, and capped with groups such as hydroxyl groups; this step is to promote the degradation reaction Metal catalysts can be added, such as organotin / organozinc / organosilver catalysts.

[0055] (3): Pump hot melt 1 and hot melt 2 into the screw reactor, then add 0-10 parts...

Embodiment 1

[0072] A kind of preparation method of degradable PLA film material, its technique is as figure 1 shown, including the following steps:

[0073] (1): 100 parts of polylactic acid (this embodiment selects commercially available U.S. natureworks polylactic acid, M w 30K~50K) into the screw extruder 1, shearing and melting to form a fluid hot melt 1.

[0074] (2): Put 20 parts of molecular chain modifier (PHB in this example) and 5 parts of degradation agent (1,4-butanediol in this example) into the second screw extruder, at 180°C The shear melting reaction forms a fluid hot melt II.

[0075] (3): Hot melt one and hot melt two are pumped in the screw reactor, then add 10 parts of chain extender (this embodiment adopts the long-chain type polyurethane prepolymer of diisocyanate termination, and it is made of toluene 2, 4 diisocyanate TDI and polyols are polymerized), react at 200°C, and carry out disorderly rearrangement of molecular fragments;

[0076] (4): The reaction melt ...

Embodiment 2

[0086] Compared with Example 1, except that 10 parts of rubber was added in step (3) in this example (this example uses rubber terminated by hydroxyl groups at both ends), the rest are the same.

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Abstract

The invention relates to a degradable PLA film material and a preparation method thereof. The PLA film material is prepared by adopting the following steps: (1) putting polylactic acid into a screw extruder 1 to form a hot melt 1; (2) putting a molecular chain modifier and a degradation agent into a screw extruder 2, and performing a shear melting reaction to form a hot melt 2 with fluidity; (3) pumping the hot melt 1 and the hot melt 2 into a screw reactor, adding a chain extender, and performing a reaction; and (4) pumping a reaction melt into a screw extruder 3, adding a crosslinking agent,performing mixing homogenization, and performing extrusion to form the film. Compared with the prior art, the method provided by the invention performs a process of ''polymer functional fragmentation-> functional fragment sequence reconstruction'' by simulating DNA sequence recombination to generate an ultra-high molecular structure with a main chain containing a functional fragment and auxiliary chains having multiple functions, so that operation time and a temperature window of film forming are optimized, and the physical performance enhancement and continuous, controllable and stable filmforming of the PLA film material are realized.

Description

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Claims

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Application Information

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Owner 上海德亿化工有限公司
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