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Toughened-flame-retardant epoxy resin material and preparation method thereof

A technology of tough epoxy resin and epoxy resin, which is applied in the field of composite materials and its preparation, can solve the problem that a single performance cannot meet the requirements of comprehensive performance of materials, and achieve non-toxic by-products, good char formation effect, and reduced smoke density Effect

Active Publication Date: 2016-06-22
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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  • Toughened-flame-retardant epoxy resin material and preparation method thereof
  • Toughened-flame-retardant epoxy resin material and preparation method thereof
  • Toughened-flame-retardant epoxy resin material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0044] Weigh the compound of ammonium polyphosphate and melamine of 50 weight parts, wherein the weight ratio of ammonium polyphosphate and melamine is 10:1, the bisphenol A type benzoxazine (structural formula a) of 10 weight parts, add 40 Parts by weight of acetone and 80 parts by weight of polyethylene glycol were stirred in a stirrer at room temperature at 300 rpm for 20 minutes, and then dispersed by 20 kilohertz ultrasound for 20 minutes to obtain a uniformly mixed suspension. The temperature of the system was raised to 40° C., mechanically stirred at 300 rpm, and acetone was removed by suction filtration under reduced pressure. Continue to raise the temperature of the mixed system to 120° C., and react with mechanical stirrin...

Embodiment 2

[0047] Put 100-mesh natural flake-like expandable graphite into a muffle furnace, expand it at a high temperature of 1000°C for 15 seconds, add it to acetone solvent, and disperse it ultrasonically 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 type benzoxazine (structural formula b), add 50 parts by weight of methylene chloride and 90 parts by weight of polydimethylsiloxane, stir After stirring for 30 minutes at room temperature at 400 rpm in the container, disperse for 20 minutes with 50 kilohertz ultrasound 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 raise the temperature of the mixed system to 150° C., and react with mechanical stirring for 4 hours, then raise the temperature to 180° C. for 1 hour. After naturally cooling to roo...

Embodiment 3

[0053] Put 300-mesh natural flake-like expandable graphite into a muffle furnace, expand it at a high temperature of 1000°C for 10 seconds, add it to acetone solvent, and disperse it ultrasonically at 80 kHz for 6 hours to obtain expanded graphite.

[0054] Weigh the compound of ammonium polyphosphate and melamine of 90 weight parts, wherein the weight ratio of ammonium polyphosphate and melamine is 10:3, the cardanol type benzoxazine (structural formula d) of 30 weight parts, add 60 weight parts Parts of ethyl acetate and 95 parts by weight of phenylmethyl silicone oil were stirred in a stirrer at room temperature at 600 rpm for 40 minutes, and then dispersed by 80 kilohertz 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 raise the temperature of the mixed system to 120° C., and react with mechanical stirri...

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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 toughening-flame-retardant epoxy resin material and a preparation method thereof, belonging to the field of composite materials and its preparation. Background technique [0002] As one of the most commonly used thermosetting plastics, epoxy resin has good mechanical properties, electrical properties, adhesive properties and chemical corrosion resistance. It is widely used in the fields of machinery manufacturing, electrical and electronic, aerospace and wind power generation in the form of adhesives, coatings, sealants, potting materials and composite materials. However, with the increase of crosslink density, poor toughness becomes a fatal defect of epoxy resin. At the same time, the limiting oxygen index (LOI) of epoxy resin is about 19.8, which is extremely flammable in the air, and is accompanied by a large amount of black smoke and toxic gases when burning, which seriously endangers human health and the ecological envi...

Claims

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Application Information

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Patent Type & Authority Applications(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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