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Preparation method for lactide grafted plant fiber reinforced poly lactic acid composite material

A plant fiber and composite material technology, applied in the field of preparation of lactide-grafted plant fiber reinforced polylactic acid composite materials, to achieve the effects of improved mechanical properties, large-scale production, and excellent environmental friendliness

Inactive Publication Date: 2013-01-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there are few reports on improving the interfacial properties of plant fiber reinforced biodegradable polymer composites, especially the grafting of plant fibers with biodegradable chemical substances from renewable raw materials.

Method used

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  • Preparation method for lactide grafted plant fiber reinforced poly lactic acid composite material
  • Preparation method for lactide grafted plant fiber reinforced poly lactic acid composite material
  • Preparation method for lactide grafted plant fiber reinforced poly lactic acid composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Surface pretreatment of plant fibers: Cut sisal fibers into 10mm long chopped fibers with a fiber cutter; then dry the chopped fibers in a vacuum drying oven at -0.1Pa, 80°C for 5 hours, take 150g Add 18%wt sodium hydroxide solution to the above-mentioned chopped fibers, soak them at 50°C for 3 hours, then wash the sisal fibers with distilled water until neutral, spread them out and air-dry them, and dry them in a vacuum drying oven at -0.1Pa, 80°C 5 hours to obtain alkali-treated sisal fiber (abbreviation: ASF);

[0025] (2) Carry out lactide grafting modification to plant fibers: add 500mL toluene into a four-necked flask, heat up to 111°C, boil the toluene for 30 minutes to remove water, cool down to 50°C, add 8g ASF and 4g For L-lactide monomer, vacuumize the reaction system for 20 minutes, then fill it with nitrogen, and raise the temperature to 130°C, add 0.032g of stannous octoate catalyst dropwise, react for 30 minutes under strong stirring, and end the reac...

Embodiment 2

[0030] (1) Surface pretreatment of plant fibers: Cut sisal fibers into 10mm long chopped fibers with a fiber cutter; then dry the chopped fibers in a vacuum drying oven at -0.1Pa, 80°C for 5 hours, take 150g Add 20%wt sodium hydroxide solution to the above chopped fibers, soak them at 25°C for 4 hours, then wash the sisal fibers with distilled water until neutral, spread them out and dry them in a vacuum oven at -0.1Pa, 60°C 10 hours, get ASF;

[0031] (2) Carry out lactide grafting modification to plant fibers: Add 500mL toluene into a four-necked flask, heat up to 111°C, boil the toluene for 30 minutes to remove water, cool down to 50°C, add 6g ASF and 4g For L-lactide monomer, vacuumize the reaction system for 20 minutes, then fill it with nitrogen, and raise the temperature to 150°C, add 0.016g of stannous octoate catalyst dropwise, and react for 20 minutes under strong stirring, and finish the reaction in a cold water bath to obtain SF- g-LA;

[0032] (3) 2g of SF-g-LA ...

Embodiment 3

[0034](1) Surface pretreatment of plant fibers: Cut sisal fibers into 10mm long chopped fibers with a fiber cutter; then dry the chopped fibers in a vacuum drying oven at -0.1Pa, 80°C for 5 hours, take 150g Add 18%wt sodium hydroxide solution to the above-mentioned chopped fibers, soak them at 50°C for 1 hour, then wash the sisal fibers with distilled water until neutral, disperse and air-dry them, and dry them in a vacuum drying oven at -0.1Pa, 80°C 8 hours, get ASF;

[0035] (2) Carry out lactide grafting modification to plant fibers: add 500mL toluene into a four-necked flask, heat up to 111°C, boil the toluene for 30 minutes to remove water, cool down to 50°C, add 8g ASF and 4g For L-lactide monomer, vacuumize the reaction system for 20 minutes, then fill it with nitrogen, and raise the temperature to 130°C, add 0.032g of stannous octoate catalyst dropwise, and react for 30 minutes under strong stirring, and finish the reaction in a cold water bath to obtain SF- g-LA;

...

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Abstract

The invention discloses a preparation method for a lactide grafted plant fiber reinforced poly lactic acid composite material. The preparation method comprises: carrying out an alkali liquid soaking treatment on plant fibers, and drying; mixing the resulting plant fibers and a lactide monomer; carrying out a graft reaction under an anhydrous and anaerobic condition under a catalysis effect of stannous octanoate to obtain lactide grafted plant fibers; drying; mixing the dried lactide grafted plant fibers and ungrafted plant fibers; and carrying out blending, hot pressing molding and cooling shaping on the mixed fibers and completely-molten poly lactic acid to obtain the composite material. According to the present invention, lactide ring opening polymerization is adopted to carry out a graft treatment on plant fibers to change surface polarity of the fibers so as to improve interface compatibility between the plant fibers and the poly lactic acid matrix, and improve the whole performance of the composite material; compared with pure poly lactic acid and untreated plant fiber reinforced poly lactic acid composite materials, the composite material prepared by the preparation method of the present invention has the following characteristics that: interface properties between the plant fibers and the poly lactic acid matrix, and mechanical properties are significantly improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of biodegradable composite materials, and relates to a method for preparing reinforced polylactic acid composite materials using plant fibers, in particular to a method for preparing lactide-grafted plant fiber reinforced polylactic acid composite materials. Background technique [0002] As the global energy crisis becomes more and more serious, the price of oil rises, and the "white" pollution caused by the environmental crisis becomes more and more serious, in the field of environmental protection and new energy development in various countries, there is a gradual rise in interest in biodegradable materials and renewable resources. Research boom. Plant fiber reinforced biodegradable composite materials belong to one of them. [0003] Plant fiber is a kind of natural fiber, which has the advantages of light weight, low price and high strength. It comes from renewable crops and is completely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08G63/08
Inventor 吴宏武姜爱菊徐晓强
Owner SOUTH CHINA UNIV OF TECH
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