Preparation method of flame-retardant epoxy foamed material

An epoxy foam and epoxy technology, which is applied in the preparation and application of foam materials, can solve problems such as uneven nucleation centers of bubbles, affecting foam quality, uneven dispersion of fillers in resins, etc., and achieve good flame retardancy and mechanical properties. The effect of reliable performance and strong operability

Inactive Publication Date: 2015-10-28
SHENYANG AEROSPACE UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the current research focuses on the molding process, heat resistance and mechanical properties of epoxy foam, but there is no report on the research and development of flame-retardant epoxy foam materials. For foam materials, a large number of fillers are added, such as: nanometer two Silicon oxide, titanium dioxide, magnesium oxide, calcium carbonate, etc., can improve the flame retardancy of the material to a certain extent, and the limiting oxygen index required for foam combustion is slightly increased, but none of them can change the flammability of epoxy foam.
Moreover, the addition of nano-fillers can easily cause uneven dispersion of fillers in the resin, making the nucleation center of the bubbles uneven during the foaming process, affecting the uniformity of the cells and the integrity of the cell walls, and then affecting the quality of the foam.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dilute 20 grams of KH560 coupling agent with 380 grams of ethanol to a dilute solution with a mass percent content of 5%, and adjust the pH value to 4-5 with acetic acid. Add 200 grams of antimony trioxide and 100 grams of fumed silica to the prepared coupling agent solution, mix them and pour them into a ball mill for grinding for 1-2 hours. Add the ground flame retardant and filler suspension into 1000 g of brominated epoxy resin (epoxy value is 0.25), and use mechanical stirring to evenly disperse the filler and flame retardant in the brominated epoxy resin. The epoxy mixture was heated to 80°C to fully remove the ethanol in the mixture. The mixture is cooled to room temperature, and 104 grams of m-xylylenediamine and 4,4'-2 aminodiphenylmethane mixed amine curing agent are added (the mass ratio of m-xylylenediamine to 4,4'-2 aminodiphenylmethane 1:1), 10 grams of azobisisobutyronitrile blowing agent, 5 grams of Tween 60, and continue to stir for 1 hour. Preheat th...

Embodiment 2

[0027] Dilute 20 grams of KH560 coupling agent with 380 grams of ethanol to a dilute solution with a mass percent content of 5%, and adjust the pH value to 4-5 with acetic acid. Add 200 grams of antimony trioxide, 50 grams of fumed silicon dioxide, and 50 grams of nano-aluminum hydroxide into the prepared coupling agent solution, mix and pour into a ball mill for grinding for 1-2 hours. Add the ground flame retardant and filler suspension into 1000 g of brominated epoxy resin (epoxy value is 0.25), and use mechanical stirring to evenly disperse the filler and flame retardant in the brominated epoxy resin. The epoxy mixture was heated to 80°C to fully remove the ethanol in the mixture. Cool the mixture to room temperature, add 415 grams of methyltetrahydrophthalic anhydride and 7.1 grams of benzyldimethylamine, 10 grams of 4,4'-oxobisbenzenesulfonyl hydrazide foaming agent, 5 grams of Tween 80 Surfactant, stirring was continued for 1 hour. Preheat the foaming mold at 145°C fo...

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PUM

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Abstract

A preparation method of a flame-retardant epoxy foamed material is provided to mainly solve the technical problem of inhibition of the inflammable characteristic of epoxy foam, and has the advantages of low preparation cost, simplicity and reliable product quality. The method is characterized in that brominated bisphenol A type epoxy resin is compounded with antimony trioxide to improve the flame retardation performance of the epoxy foam, and a nanometer filler is added to enhance the strength of the epoxy foam. The flame-retardant epoxy foamed material prepared through the preparation method can be applied in high-tech fields of aerospace, vehicles, ships and electric appliance insulation.

Description

technical field [0001] The invention relates to a method for preparing a flame-retardant epoxy foam material, which belongs to the technical field of preparation and application of foam materials. Background technique [0002] Epoxy foam has the characteristics of low density, high strength, good heat resistance, small shrinkage, and low moisture absorption, and can be applied to the manufacture of high-strength composite sandwich structures. Epoxy foam material was first successfully developed by Shell Company of the United States, and then it has been applied in the fields of naval ships, military aircraft, aircraft, buildings and offshore structures, such as ship shells, aircraft lightweight structural parts, and amphibious tanks. Buoys, ammo boxes, etc. The foam sandwich structure can effectively improve the specific strength of the structure, absorb the energy of the impact load, and improve the impact resistance of the structure. In addition, the foam sandwich struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/02C08K13/06C08K9/06C08K3/22C08K3/36C08J9/10C08G59/50C08G59/58
Inventor 陆春王静高禹张利国于祺陈平马克明
Owner SHENYANG AEROSPACE UNIVERSITY
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