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Polylactic acid composite material and method for preparing same

A composite material, polylactic acid technology, used in textiles and papermaking, fiber processing, plant fibers, etc., can solve the problems of unstable performance of reinforced polylactic acid, limited large-scale production and application, and high price, so as to achieve improved material strength, Efficient utilization, increased roughness effect

Inactive Publication Date: 2018-04-24
沈阳金博地生态环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a single fiber has instability and limitations in enhancing the performance of polylactic acid. At the same time, due to the geographical limitations of hemp plants, its cost is increasing day by day.
In addition, there are patent applications for the preparation of polylactic acid composite materials using artificial fibers, which can effectively improve material performance, but its high price limits its large-scale production and application

Method used

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  • Polylactic acid composite material and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Preparation of polylactic acid composite material

[0025] The ratio of raw materials is: polylactic acid 75%, modified fiber 18% (straw fiber 12%, hemp fiber 5%, carbon fiber 1%), epoxy soybean oil 2%, pentaerythritol 2%, stearic acid 3%.

[0026] Wherein, the modified fiber is prepared by the following method:

[0027] (1) Modification of straw fiber and hemp fiber:

[0028] a. Straw fiber and hemp fiber are mixed in proportion, washed with water, soaked in 10% sodium hydroxide solution at room temperature for 3 hours, washed several times with distilled water, adjusted to neutral pH with acetic acid, and put into a drying box Drying in medium temperature for 8 hours, the oven temperature is 80°C.

[0029] b. Soak the above alkali-treated fibers with 4% silane (vinyltriethoxysilane) aqueous solution at room temperature for 3 hours, wash with distilled water for 3 times, and dry them in a drying oven for 8 hours. The temperature of the drying oven is 80...

Embodiment 2

[0032] Embodiment 2: Preparation of polylactic acid composite material

[0033] The ratio of raw materials is: polylactic acid 70%, modified fiber 23% (straw fiber 15%, hemp fiber 6%, carbon fiber 2%), epoxy soybean oil 2%, pentaerythritol 2%, stearic acid 3%.

[0034] Wherein, the modified fiber is prepared by the following method:

[0035] (1) Modification of straw fiber and jute fiber:

[0036] a. Straw fiber and hemp fiber are mixed in proportion, washed with water, soaked in 10% sodium hydroxide solution at room temperature for 3 hours, washed several times with distilled water, adjusted to neutral pH with nitric acid, and put into a drying box During 8 hours of medium drying, the oven temperature was 80°C.

[0037] b. Soak the alkali-treated fibers above for 3 hours at room temperature with 4% silane (vinyltrimethoxysilane) aqueous solution, wash with distilled water 3 times, and dry them in a drying oven for 8 hours at a temperature of 80°C.

[0038] (2) Carbon fiber...

Embodiment 3

[0040] Embodiment 3: Preparation of polylactic acid composite material

[0041] The ratio of raw materials is: polylactic acid 79%, modified fiber 14% (straw fiber 9%, hemp fiber 3%, carbon fiber 2%), epoxy soybean oil 2%, pentaerythritol 2%, stearic acid 3%.

[0042] Wherein, the modified fiber is prepared by the following method:

[0043] (1) Modification of straw fiber and jute fiber:

[0044] a. Straw fiber and jute fiber are mixed in proportion, washed with water, soaked in 10% sodium hydroxide solution at room temperature for 3 hours, then washed several times with distilled water, and then adjusted to neutral pH with nitric acid, then put into a drying box During 8 hours of medium drying, the oven temperature was 80°C.

[0045] b. Soak the alkali-treated fibers above for 3 hours at room temperature with 4% silane (vinyltrimethoxysilane) aqueous solution, wash with distilled water 3 times, and dry them in a drying oven for 8 hours at a temperature of 80°C.

[0046] (2...

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Abstract

The invention discloses a polylactic acid composite material. The polylactic acid composite material comprises, by weight, 60-90% of polylactic acid, 10-30% of modified fibers, 0.2-10% of heat stabilizers, 0.3-8% of cross-linking agents and 0.1-10% of processing agents. The modified fibers comprise modified straw fibers, modified jute fibers and modified carbon fibers; the heat stabilizers selectively comprise epoxidized soybean oil, glycerol, triphenyl phosphite, tartaric acid, cinnamic acid and glycerol triacetate. A method for preparing the polylactic acid composite material includes uniformly mixing the polylactic acid, the modified fibers, the heat stabilizers, the cross-linking agents and the processing agents with one another; directly carrying out injection molding at the injectionmolding temperature of 150-200 DEG C under the pressure of 5-25MPa for the injection molding time of 2-10 minutes. The polylactic acid composite material and the method have the advantages that strawfibers are used as main reinforcements, jute fibers and carbon fibers are added into the straw fibers, accordingly, various properties of the polylactic acid can be effectively improved, the instability and limitation due to single fiber modification can be prevented, and straw can be efficiently utilized.

Description

technical field [0001] The invention relates to a polylactic acid composite material and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] Polylactic acid is a common fully biodegradable polymer with good biocompatibility and processing properties. However, pure polylactic acid is hard, has low impact performance, poor toughness, and is easy to bend and deform, so it needs to be modified by strengthening and toughening. [0003] Fiber reinforcement can significantly improve the strength of PLA materials. The patent with publication number CN 102085680 A uses straw fiber to reinforce polylactic acid material, which can improve the strength performance of polylactic acid. The patent application whose publication number is CN 107118528 A uses jute fiber to enhance the performance of polylactic acid, and the fiber has good compatibility and bonding with PLA. However, a single fiber has instability and limitation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L97/02C08L1/02C08K9/02C08K7/06C08J5/06D06M11/38D06M13/513D06M101/06
CPCC08J5/047C08J5/06C08J2367/04C08J2401/02C08J2497/02C08K7/06C08K9/02D06M11/38D06M13/5135D06M2101/06
Inventor 赫凯敖广宇邱凡
Owner 沈阳金博地生态环保科技有限公司
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