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Full-biodegradation bacterial cellulose/polylactic acid composite material and preparing method thereof

A technology of bacterial cellulose and composite materials, which is applied in the field of fully biodegradable bacterial cellulose/polylactic acid composite materials and its preparation, can solve the problems affecting the performance of composite materials, large anisotropy of composite materials, and limited enhancement effect of polylactic acid, etc. problems, to achieve the effect of high product dimensional stability, excellent tensile strength, and outstanding thermal stability

Active Publication Date: 2015-12-16
SHANGHAI KUMHO SUNNY PLASTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technical solution disclosed in the above-mentioned patent uses natural plant fiber as a reinforcing material to compound polylactic acid, but the compatibility between the two is poor, and the natural plant fiber itself has a limited reinforcing effect on polylactic acid, and the obtained composite The anisotropy of the material is large, which also greatly affects the performance of the composite material

Method used

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  • Full-biodegradation bacterial cellulose/polylactic acid composite material and preparing method thereof
  • Full-biodegradation bacterial cellulose/polylactic acid composite material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Accurately weigh 95 parts of polylactic acid and 5 parts of bacterial cellulose processed by the above method by weight, carry out shear melt blending with 50-60rpm in a twin-screw blending extruder for a period of time until uniform, and process The temperature is 180°C. After the mixture is extruded and cooled, it is vacuum-packed for use. After equilibrating for a period of time, the vacuum-dried blend is put into a compression molding machine and molded into a standard spline. The obtained samples were subjected to various performance tests. Some test properties of the obtained composite products are shown in Table 1.

Embodiment 2

[0052] Accurately weigh 85 parts of polylactic acid and 15 parts of bacterial cellulose by weight, carry out shear melt blending with 50-60rpm in a torque internal mixer for 5 minutes to uniformity, and the melt blending temperature is 180 ° C. After extrusion and cooling, vacuum packaging is carried out for use. After equilibrating for a period of time, the vacuum-dried blend was injection molded into standard splines. The obtained samples are finally subjected to various performance tests. Some test properties of the obtained composite products are shown in Table 1.

Embodiment 3

[0054] Accurately weigh 85 parts of polylactic acid, 15 parts of bacterial cellulose and 2 parts of coupling agent HMDI in parts by weight, carry out shear melt blending with 50-60rpm in a torque internal mixer for 5min to uniformity, melt blending The mixing temperature is 180°C. After the mixture is extruded and cooled, it is vacuum-packed for use. After equilibrating for a period of time, the vacuum-dried blend was injection molded into standard splines. The obtained samples are finally subjected to various performance tests. Some test properties of the obtained composite products are shown in Table 1.

[0055] Table 1 Comparison of properties of composite materials prepared by different contents and different processes

[0056]

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Abstract

The invention relates to a full-biodegradation bacterial cellulose / polylactic acid composite material and a preparing method thereof. The composite material is prepared from, by weight, 75 parts to 99 parts of polylactic acid, 1 part to 25 parts of bacterial cellulose and 1 part to 3 parts of coupling agents. The preparing method includes the steps that the polylactic acid and the bacterial cellulose are stirred to be mixed by weight, the coupling agents are added by weight, then the mixture is put into a mixing apparatus, the temperature is controlled to range from 170 DEG C to 220 DEG C, melt mixing is carried out, extruding and prilling are carried out, and premix particles are obtained; the premix particles are added into an injection molding machine or a compression molding machine, the temperature is controlled to range from 170 DEG C to 220 DEG C, the melting time is controlled to range from 2 min to 3 min, melt molding is carried out, and sample strips of the composite material are obtained; then drying treatment and heat treatment are carried out to increase the practical using temperature of the material. Compared with the prior art, the full-biodegradation bacterial cellulose / polylactic acid composite material and the preparing method thereof are simple in preparing technology, good in controllability, wide in raw material source and low in processing cost, and the prepared composite material is excellent in mechanical property, good in heat stability, capable of achieving full biodegradation in the natural environment and is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of biomass composite materials, and relates to a fully biodegradable bacterial cellulose / polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a biodegradable hydrophobic aliphatic thermoplastic polyester, which is mainly derived from plant resources such as corn and potatoes. Regeneration and other advantages have attracted widespread attention. However, PLA resin still has disadvantages such as high brittleness, poor thermal stability, poor impact resistance, and narrow processing window. Therefore, many researchers use different reinforcing materials or modifiers to improve the performance of polylactic acid materials. The reinforcing material is organic or inorganic high-performance fiber. [0003] For example, the Chinese invention patent application number 201010609464.4 discloses a polylactic acid / carbon fiber composite material a...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L1/02C08K5/54C08K5/29B29B9/06B29C43/58B29C45/78
Inventor 钱进李强罗明华辛敏琦
Owner SHANGHAI KUMHO SUNNY PLASTICS
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