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Preparation method of modified polylactic acid

A polylactic acid and modification technology, applied in the field of preparation of modified polylactic acid, can solve the problems of reducing the utilization rate of monomers, high process cost, difficult separation, etc., and achieves fast reaction rate, low process requirements, and grafting rate. high effect

Active Publication Date: 2011-09-28
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the co-irradiation process needs to be carried out in nitrogen or vacuum environment, and the process cost is high; in addition, in the co-irradiation process, N-vinylpyrrolidone undergoes self-polymerization reaction to form polyvinylpyrrolidone, which not only reduces the utilization of monomers rate, and the generated polyvinylpyrrolidone is easy to adhere to the surface of N-vinylpyrrolidone grafted polylactic acid material, and it is difficult to separate completely

Method used

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preparation example Construction

[0021] The invention provides a kind of preparation method of modified polylactic acid, comprises the following steps:

[0022] Irradiating polylactic acid in an air atmosphere;

[0023] The irradiated polylactic acid is grafted with auxiliary agents and monomers containing double bonds in a solvent to obtain modified polylactic acid, and the temperature of the grafting reaction is above 30°C.

[0024] In the present invention, the polylactic acid is irradiated in the air atmosphere, and a stable peroxide is formed on the molecular chain of the polylactic acid. When heated, the peroxide forms a macromolecular free radical, triggering the polymerization of monomers containing double bonds. The graft polymerization is carried out on the lactic acid macromolecule to obtain the modified polylactic acid.

[0025] The present invention has no special limitation on the polylactic acid, which may be polylactic acid sheet, polylactic acid film, polylactic acid fiber or polylactic acid...

Embodiment 1

[0039] Wash 10g of polylactic acid particles with acetone and dry them, then place them in an open container, and irradiate with cobalt-60 as the radiation source. The radiation dose rate is 0.8kGy / h, and the absorbed dose is 20kGy;

[0040] 20g of acrylic acid and 1.0g of ferrous sulfate heptahydrate were dissolved in 100g of distilled water to obtain an aqueous solution; the aqueous solution was placed in a three-necked flask connected with a stirring paddle, and the irradiated polylactic acid particles were added to the three-necked flask. After 15 minutes of nitrogen gas in the flask, the three-necked flask was sealed; the three-necked flask was placed in a water bath at 60°C, and the reaction was carried out under stirring conditions, and the stirring was stopped after 6 hours. After the three-necked flask was lowered to room temperature, the solid product was filtered out ; Soxhlet extraction is performed on the solid product with distilled water for 10 hours, and the ext...

Embodiment 2

[0043] Wash 10g of polylactic acid fiber with acetone and dry it, then place it in an open container, and irradiate it with an electron accelerator. The radiation dose rate is 1.0kGy / h, and the absorbed dose is 10kGy;

[0044] 10g of vinyl acetate and 0.05g of ferrous sulfate heptahydrate were dissolved in 100g of methanol to obtain a methanol solution; the methanol solution was placed in a three-necked flask connected with a stirring paddle, and the irradiated polylactic acid fiber was added, After passing nitrogen into the three-necked flask for 15 minutes, the three-necked flask was sealed; the three-necked flask was placed in a 50°C water bath, and the reaction was carried out under stirring conditions, and the stirring was stopped after 6 hours. After the three-necked flask was lowered to room temperature, The solid product was filtered out; the solid product was subjected to Soxhlet extraction with distilled water for 10 hours, and the extracted product was washed and dri...

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Abstract

The invention provides a preparation method of modified polylactic acid. The method comprises the following steps: irradiating polylactic acid at the air atmosphere; and carrying out grafting reaction on the irradiated polylactic acid with an auxiliary and a monomer containing a double bond in a solvent so as to obtain the modified polylactic acid, wherein the temperature of the grafting reaction is above 30 DEG C. After the polylactic acid is irradiated at the air atmosphere, stable peroxide is formed on the molecular chain of the polylactic acid; when the irradiated polylactic acid is heated, the peroxide forms the macromolecule radial of the polylactic acid to be used as an initiator for initiating the monomer containing the double bond to be subjected to the grafting polymerization on the macromolecule of the polylactic acid, so that the modified polylactic acid is obtained. The polylactic acid is directly irradiated at the air atmosphere, thus the process requirement is low, and the cost is also reduced; and the irradiated polylactic acid and the monomer containing the double bond are subjected to the grafting reaction in the solvent, and the auxiliary can be used for preventing the monomer containing the double bond from being subjected to self-polymerization reaction and further generating a homopolymer.

Description

technical field [0001] The invention belongs to the technical field of biodegradable materials, in particular to a preparation method of modified polylactic acid. Background technique [0002] Polylactic acid is a material that is completely synthesized using biological resources and chemical methods. Polylactic acid has high crystallinity, excellent processability, excellent mechanical properties, good biocompatibility and complete biodegradability. It is currently one of the biodegradable materials with the highest output, the widest application range and the greatest development potential. . [0003] Grafting refers to the reaction of combining appropriate branch chains or functional side groups through chemical bonds on macromolecular chains, and is a widely used method for modifying polymer materials. Introducing a second polymer segment or a special reactive functional group to a polymer material through grafting can effectively improve the mechanical properties, pro...

Claims

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Application Information

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IPC IPC(8): C08F283/02C08F2/46
Inventor 尹园邓鹏飏郑春柏柳美华郑晓伟
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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