Modified polylactic acid material product

A polylactic acid material and polylactic acid technology are applied in the field of biodegradable materials to achieve the effects of improving tensile strength and toughness, good thermal stability, and overcoming poor mechanical properties

Inactive Publication Date: 2019-01-11
刘辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of mechanical properties and thermal stability of existing polylactic acid products, the present invention proposes a modified polylactic acid material product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A modified polylactic acid material film, in parts by mass, 55 parts of polylactic acid, 15 parts of cornstarch, 20 parts of polyurethane, 4 parts of talcum powder and 6 parts of silicon dioxide are added to a high-speed mixer, the particle size of cornstarch Between 10 and 30 μm, the silica is nano-silica, and the particle size of nano-silica is 60-80 nm. After stirring evenly, transfer the mixture to a twin-screw extruder, and mix Refining, melting, extruding, cooling, and pelletizing to obtain the extruded material. The processing temperature of the twin-screw extruder is 168 ° C, and the screw speed is 250 rpm. The extruded material is put into a vacuum dryer for drying. The extruded material is in Dry at 55°C for 4 hours under vacuum conditions and cool to room temperature, then put it into a film blowing machine to blow the film to make the film. 165°C.

Embodiment 2

[0019] A modified polylactic acid material sheet, in parts by mass, 45 parts of polylactic acid, 25 parts of tapioca starch, 20 parts of polyurethane, 2 parts of talc and 8 parts of silicon dioxide are added to a high-speed mixer, and the amount of tapioca starch The particle size is between 10 and 30 μm, the silica is nano-silica, and the particle size of nano-silica is 60-80 nm. After stirring evenly, transfer the mixture to the twin-screw extruder, and pass through the twin-screw extruder. Mixing, melting, extruding, cooling, and pelletizing to obtain the extruded material. The processing temperature of the twin-screw extruder is 170°C, and the screw speed is 260rpm. The extruded material is put into a vacuum dryer to dry, and the extruded material is After being dried at 60° C. for 3 hours under vacuum condition and cooled to room temperature, it was put into a sheet machine, and the sheet was prepared by a multi-roll calendering process on the sheet machine.

Embodiment 3

[0021] An injection molded part of a modified polylactic acid material. In parts by mass, 50 parts of polylactic acid, 20 parts of potato starch, 20 parts of polyurethane, 3 parts of talcum powder and 7 parts of silicon dioxide are added to a high-speed mixer, and the amount of potato starch The particle size is between 10 and 30 μm, the silica is nano-silica, and the particle size of nano-silica is 60-80 nm. After stirring evenly, transfer the mixture to the twin-screw extruder, and pass through the twin-screw extruder. Mixing, melting, extruding, cooling, and pelletizing to obtain the extruded material. The processing temperature of the twin-screw extruder is 160°C, and the rotational speed of the screw is 240rpm. The extruded material is put into a vacuum dryer to dry, and the extruded material is After drying at 50° C. for 4 hours under vacuum conditions and cooling to room temperature, put them into an injection molding machine whose injection molding temperature is 165° C...

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Abstract

The invention discloses a modified polylactic acid material product which comprises polylactic acid, starch, polyurethane, talcum powder and silicon dioxide. The product is prepared by the following steps: adding the polylactic acid, starch, polyurethane, talcum powder and silicon dioxide into a high-speed mixer; transferring the uniformly mixed mixture to a granulator; mixing, fusing, extruding,cooling and slicing the mixture through the granulator to obtain an extruded material; and after the extruded material is dried, processing the extruded material to a terminal product. By adding polyurethane and starch to modify polylactic acid, the defect that the mechanical property of the polylactic acid material is poor is overcome, and the tensile strength and the toughness of the polylacticacid material product are improved. In addition, the thermal stability performance of the polylactic acid is effectively improved by means of silicon dioxide. The modified polylactic acid material product is not only excellent in mechanical property and good in thermal stability, but also can be fully biologically degraded, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of biodegradable materials, in particular to a modified polylactic acid material product. Background technique [0002] For a long time, the films, sheets and injection molding materials we have used are all petroleum synthetic resin products, such as polyethylene, polyvinyl chloride, polypropylene, polybutene and other materials, which are discarded as garbage after use, which is very serious. Big ones cause a waste of resources. If these plastic wastes are landfilled, it will take at least 200 years to be decomposed, which will cause great damage to the structure of the soil and directly lead to a series of adverse consequences such as land production reduction; if they are incinerated, the harmful substances produced during the incineration process will directly pollute air and water. [0003] Based on the above, the application of fully biodegradable materials to traditional plastic products has become...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L3/02C08L75/04C08K3/36C08K3/34C08J5/18
CPCC08J5/18C08J2367/04C08J2403/02C08J2475/04C08K2201/003C08K2201/011C08L67/04C08L2201/06C08L2201/08C08L2205/03C08L3/02C08L75/04C08K3/36C08K3/34
Inventor 刘辉
Owner 刘辉
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