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Ternary hybrid flame retardant, flame-retardant polylactic acid material and preparation methods thereof

A technology of polylactic acid materials and ternary hybridization, which is applied in the field of flame-retardant polylactic acid materials and their preparation, and ternary hybrid flame retardants, can solve problems such as low limiting oxygen index and poor flame-retardant effect, and achieve improved mechanical properties. performance, low environmental hazards, good flame retardant effect

Active Publication Date: 2019-01-08
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of poor flame retardant effect and low limiting oxygen index of existing polylactic acid flame retardant materials, the present invention provides a ternary hybrid flame retardant, a flame retardant polylactic acid material containing a ternary hybrid flame retardant and its preparation method

Method used

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  • Ternary hybrid flame retardant, flame-retardant polylactic acid material and preparation methods thereof
  • Ternary hybrid flame retardant, flame-retardant polylactic acid material and preparation methods thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Preparation of ternary hybrid flame retardant:

[0025] (1) Utilize the graphene oxide prepared by the Hummers method, weigh 0.163g graphene oxide and pour it into 100ml methanol solution, and ultrasonically disperse it evenly; weigh 2g phenylphosphinic acid and add it to the above graphene oxide In the dispersion liquid, stir magnetically for 4-5 hours under the heating condition of 80-90 ℃, centrifuge, wash with alcohol, and dry.

[0026] (2) Weighing 1.602g 2-methylimidazole and 1.487g zinc nitrate hexahydrate were dissolved in 100ml methanol respectively; added successively to the 100ml methanol dispersion of prepared graphene oxide grafted phenylphosphinic acid, at room temperature Stir for 1-2 hours, centrifuge, wash with alcohol, and dry.

Embodiment 2

[0028] Weigh 9.8g of polylactic acid particles, add them to 40ml chloroform solution and magnetically stir for 2h to dissolve them completely; weigh 0.2g ternary hybrid flame retardant, add them to 20mL chloroform solution and ultrasonically disperse them for 2h, pour them Put it into the chloroform solution of polylactic acid and stir for 4 hours, use a film coater to coat a film on a glass plate, place it at room temperature for 24 hours to evaporate the solvent, then release it with warm water, put it in an oven, and place it at 50°C for 72 hours. Measured according to GB / T2406-1993 standard test method, the tensile strength is 44.1±0.3MPa, the limiting oxygen index is 25.0%, the peak heat release rate (PHRR) is 316.2W / g, and the vertical burning level is V-2 level.

Embodiment 3

[0030] Weigh 9.75g of polylactic acid particles, add them to 40ml chloroform solution and magnetically stir for 2h to dissolve them completely; weigh 0.25g ternary hybrid flame retardant, add them to 20mL chloroform solution and ultrasonically disperse them for 2h, pour them Put it into the chloroform solution of polylactic acid and stir for 4 hours, use a film coater to coat a film on a glass plate, place it at room temperature for 24 hours to evaporate the solvent, then release it with warm water, put it in an oven, and place it at 50°C for 72 hours. Measured according to GB / T2406-1993 standard test method, the tensile strength is 43.2±0.6MPa, the limiting oxygen index is 27.0%, the peak heat release rate (PHRR) is 352.9W / g, and the vertical burning level is V-2.

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Abstract

The invention discloses a ternary hybrid flame retardant, a flame-retardant polylactic acid material and preparation methods thereof. The ternary hybrid flame retardant comprises graphene oxide, phenylphosphinic acid and a zeoliticimidazate framework material ZIF-8. The ternary hybrid flame retardant polylactic acid material comprises polylactic acid and the ternary hybrid flame retardant in the mass ratio of (97.5-98.0):(2.5-2.0). The preparation methods comprise the steps of grafting the phenylphosphinic acid onto the graphene oxide by utilizing an oxygen-containing functional group of the graphene oxide and loading the surface of the graphene oxide with ZIF-8 to obtain the ternary hybrid flame retardant; mixing a chloroform solution of the polylactic acid with a chloroform dispersion liquid of the ternary hybrid flame retardant in proportion by adopting a solution mixing method. and coating to obtain the ternary hybrid flame retardant polylactic acid material. The ternary hybrid flame-retardant polylactic acid material disclosed by the invention has the advantages that the material is simple in formula, free of halogen, friendly to environment and high in flame retardant efficiency; the mechanical properties are remarkably improved; the molten drop phenomenon is reduced; and a continuous and compact carbon layer is formed after combustion to play the roles of heat insulationand oxygen insulation.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid materials, and relates to a ternary hybrid flame retardant, a flame-retardant polylactic acid material and a preparation method thereof. Background technique [0002] Polylactic acid is an environmentally friendly aliphatic polyester. Its raw material lactic acid can be prepared by decomposing and fermenting starch-containing biological materials, and then polymerized and processed to obtain polylactic acid products. The discarded polylactic acid products can be completely degraded, will not cause any harm to the environment, and meet the requirements of sustainable development. However, polylactic acid is extremely flammable, and a large number of molten droplets are produced during combustion, which seriously limits its application in the fields of automobiles and electrical appliances. Therefore, the flame-retardant modification of polylactic acid is imperative. [0003] In the flame r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/12C08K3/04C08L67/04
CPCC08K3/042C08K9/12C08L2201/02C08L2201/22C08L67/04
Inventor 王新龙张咪李旭谢炯丁晓庆王明詹亿兴
Owner NANJING UNIV OF SCI & TECH
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