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A kind of lightweight epoxy resin microcellular foam material and preparation method thereof

A technology of microcellular foaming material and epoxy resin, applied in the field of lightweight epoxy resin microcellular foaming material and its preparation, can solve the problem of poor fluidity of prepolymer, single chemical foaming agent, high apparent density, etc. problem, to achieve the effect of uniform cell size distribution, small average cell diameter, and inhibition of merging

Active Publication Date: 2016-08-17
GUIZHOU MATERIAL IND TECH INSTITUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a lightweight epoxy resin microporous foam material and its preparation method to solve the problems of poor fluidity of prepolymers, difficulty in molding, and chemical development in the traditional two-step chemical foaming process. Single foaming agent and high apparent density

Method used

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  • A kind of lightweight epoxy resin microcellular foam material and preparation method thereof
  • A kind of lightweight epoxy resin microcellular foam material and preparation method thereof
  • A kind of lightweight epoxy resin microcellular foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 100 grams of epoxy resin, 85 grams of curing agent, 0.5 grams of curing aid, 5 grams of nano silica, 2 grams of diepoxypentyl ether dioxide, added to the reactor to react until the system becomes a solid state at room temperature, after cooling , Take 100 grams of solid and 0.5 grams of N,N'-dinitrosopentamethylenetetramine and grind them into powder, then put the powder into a pre-heated mold and foam at 110°C. After 3 hours, Raise the temperature of the oven to 150°C, keep it for 3 hours and then cool down to room temperature for demoulding. Repeat the above steps, the average particle size of the ground powder is 200μm, 100μm and 30μm. Take the powder and put it in a mold, and foam it at different temperatures to obtain microcellular foam materials with different densities. Adding different content of foaming agent to the powder can also obtain epoxy resin microporous materials with different foaming densities.

[0025] Experimental results: such as Figure 1~Figure 3...

Embodiment 2

[0027] 100 grams of epoxy resin, 80 grams of curing agent, 0.5 grams of curing aid, 5 grams of nano-calcium carbonate, 3 grams of polyethylene glycol, add to the reactor and react until the system becomes a solid state at room temperature. After cooling, take 100 grams of solid After grinding with 0.01g of azodicarbonamide to form a powder, it is put into a pre-heated mold and foamed at 180°C. After 30 minutes, the oven temperature is reduced to 150°C. After keeping it for 3 hours, it is naturally cooled to room temperature. mold.

[0028] Experimental results: such as Figure 6~Figure 7 As shown, by adding a small amount of blowing agent, the cell density of the material is lower, and the apparent density is 1.1 g / cm 3 , And the cell diameter is about 15μm.

Embodiment 3

[0030] 100 grams of epoxy resin, 80 grams of curing agent, 0.1 grams of curing aid, 5 grams of nano-montmorillonite, 10 grams of nano-silica, 2 grams of diepoxypentyl ether dioxide, added to the reactor and reacted to room temperature The system is in a solid state. After cooling, take 100 g of solid and 0.5 g of 4,4-oxobisphenylsulfonyl hydrazide and grind it into a powder, then put it in a pre-heated mold and foam at 150°C and keep it warm for 3 hours. Naturally cool to room temperature and demould.

[0031] Experimental results: such as Figure 8~Figure 9 As shown, the apparent density of the foamed material is 0.8 g / cm 3 , The cell diameter is about 50μm.

[0032] In the present invention, mechanical milling (ball mill) is used to grind to obtain powder, and powder epoxy resins with different particle diameters can be obtained by rotating speed and time. It should be noted that the grinding process cannot be continuously milled for a long time. Intermittent milling method.

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Abstract

The invention discloses a lightweight epoxy resin microporous foaming material and a preparation method thereof. Calculated by weight, the material comprises: 40-60 parts of epoxy resin, 30-50 parts of curing agent, and 0.001-1 parts of auxiliary agent Parts, 1~20 parts of nano inorganic particles, 0.05~5 parts of foaming agent, 1~10 parts of toughening agent; the preparation method is: take epoxy resin, curing agent, nano inorganic particles, curing aids, toughening agent Pre-cure until the system is in a solid state at room temperature, and after cooling, grind it into powder together with the foaming agent, and then take the powder and foam it at high temperature. The average cell diameter of the foaming material prepared by the invention is small, the cell size distribution is uniform, and the apparent density is controllable. Medium-density, high-density microcellular foaming materials and low-density foaming materials can be prepared, and the obtained powder epoxy The low temperature stability of the resin is good, and it can continue to cure and form at high temperature.

Description

technical field [0001] The present invention relates to a lightweight epoxy resin microporous foam material and a preparation method thereof, belonging to the technical field of epoxy resin microporous foam materials. Background technique [0002] Epoxy foam materials have good thermal stability, mechanical properties, insulation properties, heat insulation properties and light weight, etc., and have been widely used in automobiles, electronic potting, aircraft parts, hull shells and other fields. The preparation methods of epoxy foam materials mainly include physical foaming method, chemical foaming method and hollow microsphere curing molding method. The first two methods are suitable for preparing low density (≤0.06 g / cm 3 ) and medium density (0.06-0.32 g / cm 3 ) foaming materials, while high-density foaming materials are mostly prepared by the last method. Epoxy foam materials prepared by chemical foaming generally have larger cell sizes and uneven cell distribution. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08L71/08C08K3/36C08K3/34C08K3/26C08J9/10C08J9/08
Inventor 王醴均高萍张纯蒋团辉龚维何力
Owner GUIZHOU MATERIAL IND TECH INSTITUE
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