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Reinforced and toughened polyadipic acid/butylene terephthalate-polylactic acid composite film and preparation method thereof

A technology of butylene terephthalate and polyadipic acid, used in sustainable manufacturing/processing, biological packaging, landfill technology, etc. Field, groundwater resource pollution and other issues, to achieve the effects of improved mechanical properties, good processing performance, and stable product performance

Active Publication Date: 2020-09-01
SHANDONG AGRICULTURAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After most film products are used, they often choose to incinerate, bury or throw them away directly, all of which have caused serious harm to the environment.
At present, the raw materials used in plastic film products are polyolefin resins that degrade slowly. Under natural conditions, they are difficult to be decomposed by microorganisms in soil (about 0.2% in 10 years), and the residual time can reach more than 200 years. The film in the soil will lead to changes in the soil structure, serious soil compaction, and reduced soil porosity and permeability; if the polyethylene film is incinerated, it will produce small respirable particles (PM<2.5), and the PVC material Dioxins, furans and other highly toxic substances will be produced after the plastic film is incinerated. The toxic substances after burning may seep into the ground with rainfall and surface water, causing pollution to groundwater resources.
Although the country is currently advocating the classification and recycling of plastic film products, most plastic film products will have varying degrees of pollution after use, and it is difficult to recycle them again.
[0003] As a new type of film, fully biodegradable film has become a research hotspot because it can be completely degraded in nature. Among them, polyadipate / butylene terephthalate-polylactic acid (PBAT / PLA) composite film is the most researched. At present, there are many patents on the preparation of thin films by PBAT / PLA blending. In order to improve the compatibility between PABT and PLA, most of them use organic small molecule compatibilizers; in order to improve the mechanical properties of composite films, most of them use inorganic fillers. , in order to increase the dispersion of inorganic fillers, organic small molecule dispersants are also used, but organic small molecules are easy to precipitate from the resin during use, so it will limit the application field of the film to a certain extent

Method used

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  • Reinforced and toughened polyadipic acid/butylene terephthalate-polylactic acid composite film and preparation method thereof
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  • Reinforced and toughened polyadipic acid/butylene terephthalate-polylactic acid composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Stir the dried 850g polyadipate / butylene terephthalate pellets, 150g polylactic acid pellets, and 1g cage-type silsesquioxane containing eight epoxy groups into the twin-screw extruder In the process, the temperature from zone 1 to the head is 170°C, 180°C, 190°C, 190°C, 190°C, 190°C, 180°C, the speed of the twin-screw extruder is 60r / min, and the material is extruded through the head After cooling, it is led to the high-speed granulator by the traction device for granulation. The pellets are dried again and poured into the film blowing machine for film blowing. By adjusting the screw speed, temperature, traction rate, crimping rate and blasting rate, etc., the film of the required specification can be blown. After the film is cooled, it can be packaged and stored. The longitudinal tensile strength of the obtained film is 29.71MPa, and the transverse direction is 19.82MPa. The elongation at break was 551% and 690% in the longitudinal and transverse directions, respect...

Embodiment 2

[0028] After the dried 850g polyadipate / butylene terephthalate pellets, 150g polylactic acid pellets, and 5g cage-type silsesquioxane containing eight epoxy groups are stirred, they are added to the twin-screw extruder In the process, the temperature from zone 1 to the head is 170°C, 180°C, 190°C, 190°C, 190°C, 190°C, 180°C, the speed of the twin-screw extruder is 60r / min, and the material is extruded through the head After cooling, it is led to the high-speed granulator by the traction device for granulation. The pellets are dried again and poured into the film blowing machine for film blowing. By adjusting the screw speed, temperature, traction rate, crimping rate and blasting rate, etc., the film of the required specification can be blown. After the film is cooled, it can be packaged and stored. The longitudinal tensile strength of the obtained film is 30.06MPa, and the transverse direction is 19.40MPa. The elongation at break was 555% and 647% in the longitudinal and tra...

Embodiment 3

[0030]Stir the dried 850g polyadipate / butylene terephthalate pellets, 150g polylactic acid pellets, and 10g cage-type silsesquioxane containing eight epoxy groups into the twin-screw extruder In the process, the temperature from zone 1 to the head is 170°C, 180°C, 190°C, 190°C, 190°C, 190°C, 180°C, the speed of the twin-screw extruder is 60r / min, and the material is extruded through the head After cooling, it is led to the high-speed granulator by the traction device for granulation. The pellets are dried again and poured into the film blowing machine for film blowing. By adjusting the screw speed, temperature, traction rate, crimping rate and blasting rate, etc., the film of the required specification can be blown. After the film is cooled, it can be packaged and stored. The longitudinal tensile strength of the obtained film is 29.34MPa, and the transverse direction is 19.46MPa. The elongation at break was 564% and 667% in the longitudinal and transverse directions, respect...

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Abstract

The invention belongs to the field of agricultural polymer materials. The invention relates to a film, in particular to a reinforced and toughened polyadipic acid / polybutylene terephthalate-polylacticacid composite film and a preparation method thereof. The specific scheme is as follows: firstly, mixing polyadipic acid / polybutylene terephthalate, polylactic acid granules and polyhedral oligomericsilsesquioxane (POSS (epoxy) 8) containing eight epoxy groups, then extruding by a twin-screw extruder, granulating by a granulator, and then blowing by a film blowing machine to obtain a film product. The provided preparation method is simple, polylactic acid and polyadipic acid / polybutylene terephthalate which are wide in source are used as main raw materials, excellent properties of polylacticacid and polyadipic acid / polybutylene terephthalate are combined, films with different air permeability are prepared by adding different contents of polyhedral oligomeric silsesquioxane containing eight epoxy groups, and different actual use requirements can be met; the obtained film has excellent comprehensive performance, is a fully biodegradable film, and plays an important role in relieving white pollution.

Description

technical field [0001] The invention belongs to the field of agricultural polymer materials, and in particular relates to a reinforced and toughened polyadipate / butylene terephthalate-polylactic acid composite film and a preparation method thereof. Background technique [0002] my country is a large country with a population of 1.4 billion. The use of plastic films is increasing every day, including agricultural films, food packaging films, express packaging films, household garbage bags, etc., which are convenient for people's production and life. It has also brought about a series of serious ecological and environmental problems. After most film products are used, they often choose to incinerate, bury or directly throw them away and other disposal methods, which have caused serious harm to the environment. At present, the raw materials used in plastic film products are polyolefin resins that degrade slowly. Under natural conditions, they are difficult to be decomposed by m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L67/04C08L83/06C08J5/18
CPCC08J5/18C08J2367/02C08J2467/04C08J2483/06Y02W90/10
Inventor 徐静邱硕王伟东米庆华张坤贾宪飞高路刘佳琪
Owner SHANDONG AGRICULTURAL UNIVERSITY
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