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Polylactic acid/starch expansion flame-resistant composite material, and preparation method thereof

A technology of intumescent flame retardant and composite materials, which is applied in the field of polylactic acid/starch intumescent flame retardant composite materials and its preparation, can solve the problems of poor compatibility between starch and matrix plastics, failure to meet application requirements, poor thermal stability of starch, etc. , to achieve the effect of promoting char formation ability, high phosphorus content and high phosphorus content

Active Publication Date: 2017-03-15
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many reports on the application of natural starch in plastics such as polylactic acid and polypropylene, but there are obvious defects: first, the thermal stability of starch is not good, it is easy to degrade during processing, and yellowing occurs, resulting in unsightly products. Beautiful; Secondly, the compatibility between starch and base plastic is very poor, which limits the filling amount of starch, and the mechanical properties of the material are very poor, which cannot meet the requirements of practical applications

Method used

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  • Polylactic acid/starch expansion flame-resistant composite material, and preparation method thereof
  • Polylactic acid/starch expansion flame-resistant composite material, and preparation method thereof
  • Polylactic acid/starch expansion flame-resistant composite material, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] In a 250mL three-necked flask, 20g 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and 15g maleic anhydride (MA) were dissolved in 50mL toluene and 20mL dioxy In the six ring, heated to 40°C, protected by nitrogen, and reacted at reflux for 12h. After the completion of the reaction, the solvent was removed by rotary evaporation, and the product 1 was obtained after vacuum drying, which was ready for use.

[0062] In a 250mL three-necked flask, 20g starch (corn starch) and 40mL pyridine were heated to 65°C under nitrogen protection and refluxed for 2h. After the temperature dropped to 50°C, 20g of product 1 (dissolved in DMSO) was added with the catalyst 4-dimethylaminopyridine, protected by nitrogen, and reacted at 50°C under reflux for 12h. After the reaction is completed, it is washed, purified, and dried in vacuum to obtain bio-based phosphorous starch, that is, modified starch.

Embodiment 2

[0064] In a 250 mL three-necked flask, 20 g DOPO and 18 g maleic anhydride (MA) were dissolved in 50 mL xylene and 20 mL THF (tetrahydrofuran) respectively, heated to 50° C., protected by nitrogen, and reacted under reflux for 24 hours. After the completion of the reaction, the solvent was removed by rotary evaporation, and the product 1 was obtained after vacuum drying, which was ready for use.

[0065] In a 250mL three-necked flask, 20g starch (corn starch) and 60mL pyridine were heated to 75°C and refluxed for 4h under nitrogen protection. After the temperature dropped to 50°C, 25g of product 1 (dissolved in DMSO) was added with the catalyst 4-dimethylaminopyridine, protected by nitrogen, and reacted under reflux for 24h. After the reaction is completed, it is washed, purified, and dried in vacuum to obtain bio-based phosphorous starch, that is, modified starch.

Embodiment 3

[0067] In a 250mL three-necked flask, 20g DOPO and 21g maleic anhydride (MA) were dissolved in 70mL xylene, heated to 60°C, protected by nitrogen, and reacted under reflux for 24h. After the completion of the reaction, the solvent was removed by rotary evaporation, and the product 1 was obtained after vacuum drying, which was ready for use.

[0068] In a 250mL three-necked flask, 20g starch (corn starch) and 80mL pyridine were heated to 85°C and refluxed for 8h under nitrogen protection. After the temperature dropped to 65°C, 35g of product 1 (dissolved in DMSO) was added with the catalyst 4-dimethylaminopyridine, protected by nitrogen, and reacted under reflux for 24h. After the reaction is completed, it is washed, purified, and dried in vacuum to obtain bio-based phosphorous starch, that is, modified starch.

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Abstract

The invention discloses a polylactic acid / starch expansion flame-resistant composite material with excellent flame resistance, and a preparation method thereof. The polylactic acid / starch expansion flame-resistant composite material is composed of, by weight, 60 to 89% of polylactic acid, 5 to 30% of an acid source, 5 to 30% of a modified starch, and 1 to 15% of a gas source. In a preferred embodiment, the modified starch is phosphorized maleic anhydride grafting modified starch (bio-based phosphorus containing starch). According to the preparation method, polylactic acid possesses excellent compatibility with the modified starch; synergistic effect of the acid source, the carbon source (the modified starch), and the gas source is capable of improving charring forming capability of the polylactic acid matrix, and improving high temperature stability and flame resistance of polylactic acid greatly. According to the preparation method, adoption of an existing double-screw extruder is enough for production; preparation is simple and convenient; and the preparation method is convenient for industrial production.

Description

Technical field [0001] The invention relates to the technical field, in particular to a polylactic acid / starch expanded flame-retardant composite material and a preparation method thereof. Background technique [0002] With the increasingly severe environmental problems and the oil crisis, people have gradually increased the research on sustainable materials. Bio-based materials, as completely biodegradable green materials, fully meet today's development needs and have received extensive attention. Among them, polylactic acid (PLA), as the most promising bioplastic, has excellent mechanical properties and good processing properties, and is widely used in the automotive industry, electrical facilities and other fields. However, its flammability has greatly restricted its promotion in these fields. At present, due to the advantages of low toxicity, environmental protection and smoke suppression, intumescent flame retardant has replaced the traditional halogen-containing compound f...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L3/06C08K3/32C08K5/3492C08B31/04
CPCC08B31/04C08L67/04C08L2201/02C08L2201/08C08L3/06C08K2003/323C08K5/34922
Inventor 孙晋皓汤兆宾朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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