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Light-high-strength epoxy foam material and preparation method thereof

A foaming material and high-strength technology, applied in the field of foaming materials, can solve the problems of high cost and difficult to control the chemical reaction of epoxy foams, and achieve the effect of smooth surface and dense internal cell structure.

Active Publication Date: 2008-12-10
SHANGHAI RES INST OF MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the chemical reaction of epoxy foam is difficult to control, it is not as easy as polyurethane in in-situ casting, and its high cost limits its application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A kind of preparation method of light weight high-strength epoxy foaming material: 188 grams of bisphenol A epoxy resin, aromatic amine DDM35 grams, low molecular weight polyamide (650 type) 12 grams, nitrile rubber 9.7 grams, surface active Add 0.4 grams of alkylphenol polyethylene glycol ether OP and 16 grams of domestic ceramic powder into the reactor and place in a 50°C water bath to preheat and stir evenly. After 40 minutes, the temperature of the material reaches about 49°C. At this time, add the pre-weighed 1 g of good foaming agent diazoaminobenzene, continue to stir and react for 20 minutes, inject the material into a mold preheated to 51°C, and transfer it to an oven, keep the oven temperature at 60°C, after 3 hours, lift the oven Temperature to 120°C, keep warm for 6 hours and then cool to room temperature with the furnace to demould.

Embodiment 2

[0050] A kind of preparation method of light-weight high-strength epoxy foam material: 150 grams of polyether epoxy resin, aromatic amine DDM 29.4 grams, low molecular weight polyamide (650 type) 9.5 grams, nitrile rubber 8.3 grams, surface active Add 0.4 g of agent OP and 12.3 g of hollow ceramic microspheres into the reactor and place in a 50°C water bath to preheat and stir evenly. After 40 minutes, the temperature of the material reaches 48°C. 6 grams of hydrazine, continue to stir and react for 20 minutes, the temperature of the material rises to 50°C, inject the material into a mold preheated to 50°C, and transfer it to the oven, use "PID" to control the temperature increase in stages, after heat preservation (130°C) Cool to room temperature with the furnace and release the mold.

Embodiment 3

[0052]A preparation method of light-weight high-strength epoxy foaming material: 60 grams of bisphenol A epoxy resin, 60 grams of novolak epoxy resin, 33 grams of aromatic amine DDM, 2.4 grams of ethylenediamine, and dioxydioxide Add 18 grams of amyl ether and 3.6 grams of surfactant OP into the reactor and place it in a 50°C water bath to preheat and stir evenly. After 20 minutes, the temperature of the material reaches 45°C. At this time, add the pre-weighed foaming agent Sulfonylhydrazide diphenyl ether 6 grams, continue to stir and react for 20 minutes, the temperature of the material rises to about 47°C, inject the material into a mold preheated to 56°C, and transfer it to the oven, use "PID" to control the temperature rise in stages, Keep warm (140°C) and then cool down to room temperature with the furnace to demould.

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PUM

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Abstract

The invention relates to a light high intensity epoxy foaming material and a preparation method thereof. The material comprises the following compositions in weight percentage: 50 to 90 percent of an epoxide resin, 5 to 40 percent of an amine curing agent, 0.1 to 15 percent of azocompound and a hydrazine-type foaming agent, 2 to 20 percent of a toughener, 0.1 to 5 percent of a surface active agent, and 0 to 30 percent of a filling material. The foaming speed and the curing speed of an epoxy foaming curing system are coordinated by the 'prereaction' preparation technique and the 'postcuring' and sizing processes are performed further. Compared with the prior technique, the foam body prepared by the method has smooth surface, the internal bubble structure is compact and even, and the foaming material meets the intensity requirement and the related technical conditions of a fragile cap of various models of missile. At present, the foaming material has been applied to certain models of missile fragile caps and is in mass production; moreover, the foaming material can be applied in the related technical fields where light and high intensity products are required to be manufactured.

Description

technical field [0001] The invention relates to a foaming material, in particular to a lightweight high-strength epoxy foaming material and a preparation method thereof. Background technique [0002] For products or parts that require lightweight, high-strength foaming materials, it is of special significance to use direct foaming without pressing. This foam can be used in various foaming processes. Manufactured from low-molecular-weight resins that react violently with functional group compounds. Among them, the low-molecular liquid epoxy resin prepared by epichlorohydrin and diphenolic propane (bisphenol A) is passed through diamine or polyamine, amide, polybasic acid, soluble phenolic resin or other active hydrogen atom-containing Epoxy foams formed from different foaming systems during the setting (curing) process of the compound have many properties that are particularly good for the manufacture of lightweight, high-strength parts such as missile frangible covers, incl...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08J9/10C08K5/17C08K7/24B29C44/00
Inventor 邱春海郝珊英潘钢樑蔡安定寿子琪
Owner SHANGHAI RES INST OF MATERIAL
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