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Functionalized graphene flame retardant and polylactic acid composite material enhanced by functionalized graphene flame retardant

A composite material and flame retardant technology, which is applied in the field of flame retardant composite materials, can solve the problems of limiting the application of flame retardants and the destruction of physical and mechanical properties of composite materials, and achieve the goal of improving dispersion, improving flame retardant performance, and broad application prospects Effect

Inactive Publication Date: 2018-09-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the amount of flame retardants increases, the physical and mechanical properties of the composites will be damaged to a certain extent, which will further limit the application of flame retardants in some specific fields.

Method used

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  • Functionalized graphene flame retardant and polylactic acid composite material enhanced by functionalized graphene flame retardant
  • Functionalized graphene flame retardant and polylactic acid composite material enhanced by functionalized graphene flame retardant
  • Functionalized graphene flame retardant and polylactic acid composite material enhanced by functionalized graphene flame retardant

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Dissolve 2g of graphene oxide (GO, prepared by the Hummers method using natural graphite, sodium nitrate and potassium permanganate as raw materials) in 100mL of tetrahydrofuran, add 250mL of thionyl chloride after complete dissolution and Stirred and refluxed in an oil bath for 6h. After the reaction was completed, it was cooled to room temperature, filtered, washed with deionized water until neutral, and vacuum-dried at 80° C. for 8 h to obtain an intermediate product.

[0034] (2) The intermediate product and 19.542g 10-(2,5-dihydroxyphenyl)-9,10-dihydro-9-oxa-10-phosphinephenanthrene-10-oxide (DOPO-HQ) were added to 300mL chlorobenzene solution was stirred and refluxed in an 85°C oil bath for 10h, and then the resulting precipitate was cooled to room temperature, filtered, and dried to obtain a functionalized graphene flame retardant (FGO-HQ).

Embodiment 2

[0036] (1) Dissolve 0.5g graphene oxide (GO, prepared by Hummers method using natural graphite, sodium nitrate and potassium permanganate as raw materials) in 100mL N,N-dimethylformamide, and add 100mL of thionyl chloride was stirred and refluxed in an oil bath at 65°C for 8h. After the reaction was completed, it was cooled to room temperature, filtered, washed with deionized water until neutral, and vacuum-dried at 70° C. for 12 h to obtain an intermediate product.

[0037] (2) The intermediate product and 3.053g 10-(2,5-dihydroxyphenyl)-9,10-dihydro-9-oxa-10-phosphinephenanthrene-10-oxide (DOPO-HQ) were added to Stir and reflux in 300mL tetrahydrofuran solution in an oil bath at 85°C for 12h, then cool the resulting precipitate to room temperature, filter, and dry to obtain a functionalized graphene flame retardant (FGO-HQ).

[0038] The infrared spectrogram of the functionalized graphene flame retardant prepared by the present embodiment is as follows figure 2 shown. Fr...

Embodiment 3

[0041] The functionalized graphene flame retardant prepared in Example 2 and polylactic acid are added into the internal mixer according to 2:98 (mass ratio) at 180°C for melt blending for 10min, and after mixing evenly, the mixture is heated at a temperature of 200°C and a pressure of 120×120×3.0mm obtained by hot pressing under the condition of 15MPa 3 and 100×100×1.0mm 3 polylactic acid composite sheet.

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Abstract

The invention belongs to the technical field of flame-retarding composite materials and discloses a functionalized graphene flame retardant and a polylactic acid composite material enhanced by the functionalized graphene flame retardant. The functionalized graphene flame retardant is prepared by the following steps: completely dissolving graphene oxide into a solvent; then adding thionyl chlorideand stirring and refluxing to react; cooling to room temperature and filtering; after washing with water until a solution is neutral, drying in vacuum to obtain an intermediate product; adding the obtained intermediate product and DOPO-HQ into a solvent, and stirring and refluxing to react; after cooling to room temperature, filtering; drying obtained precipitate. Polylactic acid and the functionalized graphene flame retardant are fused and blended, and then a mixture is subjected to compression molding to obtain the polylactic acid composite material enhanced by the functionalized graphene flame retardant. The vertical combustion grade of the prepared polylactic acid composite material can reach a grade V-0, and has good flame-retarding performance and thermal stability; meanwhile, the mechanical properties of the material are not damaged; the polylactic acid composite material has a wide application prospect in the fields including building materials, automotive interior trims, electronic products and the like.

Description

technical field [0001] The invention belongs to the technical field of flame retardant composite materials, in particular to a functionalized graphene flame retardant and a polylactic acid composite material reinforced by it. Background technique [0002] With the rapid development of modern technology and industry, people's excessive dependence on and consumption of petroleum resources, the production and disposal of petroleum-based materials have brought a series of environmental problems, so the development and application of biodegradable plastics have gradually become a growing concern research direction. As one of the most promising materials among aliphatic polyesters, polylactic acid is a biodegradable resin prepared by chemical synthesis from renewable plants such as potatoes and corn. Due to its good mechanical properties, biocompatibility, and processability, polylactic acid has shown great potential in the fields of biological tissue engineering scaffolds, autom...

Claims

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Application Information

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IPC IPC(8): C08K9/04C08K9/02C08K3/04C08L67/04
CPCC08K9/02C08K9/04C08K3/042C08L67/04
Inventor 师星星况太荣彭响方陈斌艺
Owner SOUTH CHINA UNIV OF TECH
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