Polylactic acid graft modified natural fiber and PLA composite material and preparation method thereof

A natural fiber and graft modification technology, which is applied in the field of polylactic acid graft modified natural fiber and PLA composite materials and its preparation, can solve the problems of poor reinforcement effect and poor interface compatibility

Active Publication Date: 2020-10-27
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a polylactic acid graft modified natural fiber and PLA composite material and its preparation method, to overcome the problems of poor interfacial compatibility and poor reinforcing effect in the prior art when natural fiber reinforced polylactic acid defect
The invention solves the interfacial compatibility between natural fiber and PLA resin by modifying long-chain branched polylactic acid

Method used

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  • Polylactic acid graft modified natural fiber and PLA composite material and preparation method thereof
  • Polylactic acid graft modified natural fiber and PLA composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Azidation modification of bamboo fiber: Disperse 2.0g of bamboo fiber in 150ml of toluene, add 4.0g of p-toluenesulfonyl chloride, react at 10°C for 24h, wash with ethanol to remove unreacted monomers, and obtain p-toluenesulfonic acid modification permanent bamboo fiber. Disperse it in 150ml of DMF solvent, add 0.5g of sodium azide, react at 100°C for 12h, wash with ethanol and dry to obtain azide-modified bamboo fiber. (Reference: Guo Fei. ATRP Surface Modification of Cellulose Nanocrystals. Section 2.3.2 of Master's Degree Thesis of Wuhan Textile University, 2016)

[0043] Synthesis of alkyne-terminated linear polylactic acid: Mix 20g of lactide, 0.02g of propargyl alcohol, and 0.01g of stannous octoate, and react at 150°C and 100Pa for 2 hours. The weight-average molecular weight measured by GPC is 1.0×10 4 g / mol.

[0044] 1.5g azide-modified bamboo fiber and weight-average molecular weight 1.0×10 4g / mol of alkyne-terminated linear polylactic acid was added to 10...

Embodiment 2

[0046] Hemp fiber thiol modification: Disperse 2.5g hemp fiber in 150ml dimethylformamide DMF, add 3-mercaptopropionic acid 1.2 times the weight of hemp fiber, react at 120°C for 12h, purify and dry to obtain mercapto modification Sexual hemp fiber.

[0047] Synthesis of terminal double bond branched polylactic acid: in the first step, mix 10g lactide, 0.02g 3-butene-1 alcohol, and 0.05g stannous octoate, and react at 150°C and 100Pa for 1h to obtain the terminal double bond Bonded linear polylactic acid; the second step, with dichloromethane (100ml) as a solvent, 2,2,5-trimethyl-1,3-dioxane-5-formic acid (1.0g) as a reagent, the first The terminal double-bond linear polylactic acid obtained in the first step was catalyzed by 0.02g 4-dimethylaminopyridine (DMAP), reacted at 25°C for 24h, then added 2% (V / V) 1mol / L HCl to continue the reaction for 24h, and passed through ethanol Precipitate and dry to obtain polylactic acid with two hydroxyl groups at the end; in the third ste...

Embodiment 3

[0050] Synthesis of terminal double-bond linear polylactic acid: Mix 20g lactide, 0.02g 3-butene-1 alcohol, and 0.01g stannous octoate, react at 150°C and 100Pa for 0.5h, and measure the weight-average molecular weight by GPC 5.3×10 3 .

[0051] 1.8g wool with a weight average molecular weight of 5.3×10 3 The terminal double-bond linear polylactic acid was added to 100ml of toluene solvent at a mass ratio of 1:5, 0.01g of azobisisobutyronitrile was used as a thermal initiator, condensed and refluxed for 15 hours, and unreacted functionalized polylactic acid was removed by Soxhlet extraction. Lactic acid, made of polylactic acid modified natural fibers. Then add it and 20g PLA4032D into a micro-extruder at 160°C and mix for 20min at a mass ratio of 0.5:9.5 to make composite slices, and then make 100mm×10mm×4mm wool by molding at 200°C and 1MPa pressure. Reinforced polylactic acid composites. The breaking strength measured by the universal material testing machine at a tensi...

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Abstract

The invention relates to a polylactic acid graft modified natural fiber and PLA composite material and a preparation method thereof. The method comprises the following steps of: mixing functional natural fiber, functional polylactic acid and a solvent, adding an initiator, and carrying out click chemical reaction. The method can effectively improve a two-phase interface, is simple and feasible, and is suitable for industrial production; the prepared natural fiber/polylactic acid composite material and the composite fiber have more excellent breaking strength, impact strength and heat resistance.

Description

technical field [0001] The invention belongs to the field of polylactic acid material and its preparation, in particular to a polylactic acid grafted modified natural fiber and PLA composite material and a preparation method thereof. Background technique [0002] Petroleum-based plastic products are seriously threatening the living environment of human beings due to their long degradation cycle, so the development of degradable plastics is of great significance. Polylactic acid is an environmentally friendly material that has been studied most actively in recent years. It has outstanding advantages such as good biocompatibility and degradability, and is widely used in packaging, textiles, agriculture, and biomedical fields. However, inherent defects such as high brittleness and poor impact strength have become the bottleneck for the further development of PLA materials. Natural fiber is a kind of fiber that is original in nature or directly obtained from artificially cultiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08L67/04C08L87/00
CPCC08G81/00C08L67/04C08L87/005
Inventor 董奎勇马博谋何勇王学利俞建勇
Owner DONGHUA UNIV
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