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A kind of toughened-flame-retardant epoxy resin material and preparation method thereof

An epoxy resin, flame retardant technology, applied in the field of composite materials and their preparation, can solve the problem that a single performance cannot meet the requirements of the comprehensive performance of the material, and achieves non-toxic by-products, high environmental and human safety, and simple process. Effect

Active Publication Date: 2017-11-24
SHAANXI TIANCE NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Researchers have devoted a lot of effort to the flame retardant modification and toughening modification of epoxy resin, but the improvement of a single performance has been difficult to meet the requirements of the application field for the comprehensive performance of materials

Method used

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  • A kind of toughened-flame-retardant epoxy resin material and preparation method thereof
  • A kind of toughened-flame-retardant epoxy resin material and preparation method thereof
  • A kind of toughened-flame-retardant epoxy resin material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Put 50 mesh natural scaly expandable graphite into a muffle furnace, expand it at a high temperature of 800°C for 5 seconds, add it to an acetone solvent, and ultrasonically disperse at 30 kHz for 12 hours to obtain expanded graphite.

[0044] Weigh 50 parts by weight of the compound of ammonium polyphosphate and melamine, wherein the weight ratio of ammonium polyphosphate and melamine is 10:1, 10 parts by weight of bisphenol A benzoxazine (structure a), add 40 Parts by weight of acetone and 80 parts by weight of polyethylene glycol were stirred for 20 minutes at 300 rpm at room temperature in a stirrer, and then dispersed for 20 minutes using 20 kHz ultrasound to obtain a uniformly mixed suspension. The system was heated to 40°C, mechanically stirred at 300 rpm, and acetone was removed by suction filtration under reduced pressure. Continue to heat up the mixed system to 120°C, mechanically stir and react for 3h, then heat up to 160°C for 4h. After being naturally cooled ...

Embodiment 2

[0047] Put 100 mesh natural scaly expandable graphite into a muffle furnace, expand it at a high temperature of 1000°C for 15 seconds, add it to an acetone solvent, and ultrasonically disperse at 50 kHz for 8 hours to obtain expanded graphite.

[0048] Weigh 90 parts by weight of ammonium polyphosphate and 10 parts by weight of allyl benzoxazine (structure b), add 50 parts by weight of dichloromethane and 90 parts by weight of polydimethylsiloxane, and stir After stirring for 30 minutes at 400 rpm at room temperature in the vessel, 50 kHz ultrasound was used for dispersion for 20 minutes to obtain a uniformly mixed suspension. The system was heated to 70°C, mechanically stirred at 400 rpm, and dichloromethane was removed by suction filtration under reduced pressure. Continue to heat up the mixed system to 150°C, mechanically stir and react for 4h, then heat up to 180°C for 1h. After being naturally cooled to room temperature, stirring is stopped, and after repeated washing with ...

Embodiment 3

[0053] Putting 300 mesh natural scaly expandable graphite into a muffle furnace, expanding at a high temperature of 1000°C for 10 seconds, adding it to an acetone solvent, and dispersing ultrasonically at 80 kHz for 6 hours to obtain expanded graphite.

[0054] Weigh 90 parts by weight of the compound of ammonium polyphosphate and melamine, wherein the weight ratio of ammonium polyphosphate and melamine is 10:3, 30 parts by weight of cardanol type benzoxazine (structure d), add 60 parts by weight Parts of ethyl acetate and 95 parts by weight of phenyl methyl silicone oil were stirred in a mixer at room temperature at 600 rpm for 40 minutes, and then dispersed with 80 kHz ultrasound for 60 minutes to obtain a uniformly mixed suspension. The system was heated to 65°C, mechanically stirred at 600 rpm, and ethyl acetate was removed by suction filtration under reduced pressure. Continue to heat up the mixed system to 120°C, mechanically stir and react for 5h, then heat up to 200°C for...

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Abstract

The invention discloses a toughened-flame-retardant epoxy resin and a preparation method thereof. The toughened epoxy resin material comprises an epoxy resin monomer, a curing agent, expanded graphite and flame-retardant microcapsules. The toughened epoxy resin material is prepared by curing the following components in parts by weight at 100-220 DEG C: 70-95 parts of epoxy resin monomer, 5-25 parts of flame-retardant microcapsule, 10-30 parts of curing agent and 0.3-1 part of expanded graphite. The flame-retardant microcapsules are prepared by using ammonium polyphosphate with the molecular weight of greater than 1500 as a core and a benzoxazine crosslinked network as a shell. The diameter of the expanded graphite lamellae is 3-15 mu m, and the expanded graphite mainly performs the functions of synergic toughening and flame retardancy. The toughened-flame-retardant epoxy resin material implements synchronous enhancement of toughness and flame retardancy, and effectively overcomes the defect of the single performance improvement mode for the material. The toughened-flame-retardant epoxy resin can be used in the occasions with higher requirements for toughness and flame retardancy.

Description

Technical field [0001] The invention relates to a toughened-flame retardant epoxy resin material and a preparation method thereof, and belongs to the field of composite materials and preparation thereof. Background technique [0002] As one of the most commonly used thermosetting plastics, epoxy resin has good mechanical properties, electrical properties, adhesive properties and chemical resistance. In the form of adhesives, coatings, sealants, potting materials and composite materials, it is widely used in the fields of machinery manufacturing, electronic and electrical, aerospace and wind power generation. However, as the crosslink density increases, poor toughness becomes a fatal defect of epoxy resins. At the same time, the limiting oxygen index (LOI) of epoxy resin is about 19.8, which is very easy to burn in the air, and it is accompanied by a large amount of black smoke and toxic gas when burning, which seriously harms human health and the ecological environment. Its bri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08K9/10C08K3/32C08K5/3492C08K7/24
CPCC08K3/32C08K5/34922C08K7/24C08K9/10C08K2003/323C08L2201/02C08L2201/22C08L63/00
Inventor 赵春霞李云涛何达
Owner SHAANXI TIANCE NEW MATERIAL TECH
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