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Polylactic acid-lignin-starch composite material and preparation method therefor

A composite material and lignin technology, which is applied in the field of polylactic acid-lignin-starch composite material and its preparation, can solve the problems of lack of reactive functional groups, poor brittleness of PLA, non-hydrophilicity, etc., and achieve simple operation and high effect Good, improve the effect of comprehensive mechanical properties

Active Publication Date: 2018-12-07
济宁比奥新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PLA has performance characteristics such as poor brittleness and easy bending deformation; in addition, the chemical structure of PLA lacks reactive functional groups and does not have hydrophilicity, so further modification is required

Method used

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  • Polylactic acid-lignin-starch composite material and preparation method therefor
  • Polylactic acid-lignin-starch composite material and preparation method therefor
  • Polylactic acid-lignin-starch composite material and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of embodiment 1 polylactic acid-lignin-starch composite material

[0032] (1) Calculated in parts by mass, its composition and content are as follows:

[0033]

[0034] (2) above-mentioned formula reacts according to the following steps:

[0035] (1) First weigh the PLA and lignin in proportion, and mix them evenly at room temperature;

[0036] (2) After mixing the weighed DCP, GMA, and 1010 evenly, they are added to the reactive extruder together with the PLA and lignin mixture. The temperature of the extruder is set at 150°C, and the screw speed is 400RPM. Granulating to prepare PLA lignin composite material particles. The above composite material particles are injection molded (injection temperature is 160-180°C, injection pressure is 40-80MPa, injection speed is 50-150mm / s, holding pressure is 40-50MPa, holding time is 5S, cooling time is 15S) Standard test specimens were prepared for use.

Embodiment 2

[0037] The preparation of embodiment 2 polylactic acid-lignin-starch composite material

[0038] (1) Calculated in parts by mass, its composition and content are as follows:

[0039]

[0040]

[0041] (2) above-mentioned formula reacts according to the following steps:

[0042] (1) First weigh PLA, lignin and starch in proportion, and mix them evenly at room temperature;

[0043] (2) After mixing the weighed DCP, GMA, and 1010 evenly, they are added to the reaction extruder together with the PLA and lignin mixture. The temperature of the extruder is set at 190°C, and the screw speed is 300RPM. Granulating to prepare PLA lignin composite material particles. The above-mentioned composite material particles were injection molded (the injection molding process was the same as in Example 1) to prepare standard test specimens for future use.

Embodiment 3

[0044] The preparation of embodiment 3 polylactic acid-lignin-starch composite material

[0045] (1) Calculated in parts by mass, its composition and content are as follows:

[0046]

[0047] (2) above-mentioned formula reacts according to the following steps:

[0048] (1) First weigh PLA, lignin and starch in proportion, and mix them evenly at room temperature;

[0049] (2) After mixing the weighed DCP, GMA, and 1010 evenly, they are added to the reaction extruder together with the PLA and lignin mixture. The temperature of the extruder is set at 160°C, and the screw speed is 100RPM. Granulating to prepare PLA lignin starch composite material particles. The above-mentioned composite material particles were injection molded (the injection molding process was the same as in Example 1) to prepare standard test specimens for future use.

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Abstract

The invention discloses a polylactic acid-lignin-starch composite material and a preparation method therefor. The preparation method comprises the following steps: (1) firstly, proportionally weighing100 parts of PLA, 20-50 parts of lignin and 20-50 parts of starch, carrying out uniform mixing at normal temperature, and adding the physical mixture into reaction equipment; and (2) uniformly mixing0.01-5 parts (by weight) of initiator, 0.01-15 parts (by weight) of reaction monomer and 0.1-1 part (by weight) of antioxidant, adding the mixture into a reaction vessel, and carrying out blending ata certain temperature, thereby obtaining the polylactic acid-lignin-starch composite material. According to the polylactic acid-lignin-starch composite material and the preparation method therefor, through modifying the PLA resin with the lignin and the starch, the mechanical properties of the PLA can be effectively improved on the basis of not affecting the complete biodegradability of the material, meanwhile, the production cost is reduced greatly, and the marketing is better facilitated.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a polylactic acid-lignin-starch composite material and a preparation method thereof. Background technique [0002] At present, with the continuous development of the national economy, the consumption of plastic products is increasing, and synthetic plastics are playing an increasingly important role in production and life. However, since most of the plastic products cannot be degraded after being discarded, they exist for a long time, and the continuous accumulation has caused serious white pollution. Plastic products with environmental protection requirements are becoming more and more urgent and have aroused widespread interest of researchers. Among them, degradable resins have become a research hotspot due to their degradation characteristics and economic characteristics. [0003] Polylactic acid (PLA) is an important lactic acid derivative. It is a kind of polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L3/02C08L97/00C08F291/08C08F220/32
CPCC08F251/00C08F283/02C08F289/00C08L67/04C08L2201/06C08L2205/03C08L3/02C08L97/005C08F220/325
Inventor 施晓旦邵威
Owner 济宁比奥新材料有限公司
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