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Foam body with thermal self-expansion function and preparation method thereof

A self-expanding, foam technology, applied in the field of fiber composite material forming, can solve the problems of adding post-repair process, poor temperature resistance of rigid foam, insufficient high-energy adhesiveness, etc. , the effect of light weight

Pending Publication Date: 2020-04-17
XIAMEN HOWER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. In order to make the carbon fiber or glass fiber reinforced material surface layer of the molded product cooperate with the rigid foam core material, the bond is firm and does not delaminate, the glued layer must be used, which increases the process and cost
[0005] 2. Because some rigid foams have poor temperature resistance, they cannot withstand the molding temperature of 140-180°C commonly used carbon fiber or glass fiber reinforced materials, that is, high temperature shrinkage, resulting in poor appearance of the product during the molding process and increased scrap rate
[0006] 3. Both the glued layer and the rigid foam have no outward expansion pressure, which also causes apparent defects such as lack of glue in the molded product, which increases the post-stage repair process
Although the above two problems can be solved, the high-energy adhesive itself is not viscous enough, and the initial adhesion to the rigid foam is poor. Especially for complex parts, it is difficult to ensure that the high-energy adhesive and the rigid foam are completely free of air bubbles during the lamination operation. , resulting in poor operation

Method used

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  • Foam body with thermal self-expansion function and preparation method thereof
  • Foam body with thermal self-expansion function and preparation method thereof
  • Foam body with thermal self-expansion function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1: Preparation of foam with thermal self-expansion function

[0048] Cutting: Cut the rigid foam according to the size of the product;

[0049] Spraying: Spray a layer of thermal self-expanding resin on the outer layer of the rigid foam. The coating thickness is 0.1mm by cross-spraying.

[0050] The prepared foam with thermal self-expansion function:

[0051] Initial tackiness to the finger touch, when the finger is pressed against the surface of the thermally self-expanding resin layer for 15 seconds, the resin layer sticks to the hand, but does not transfer to the finger;

[0052] The prepared foam was placed in an oven at 150°C and heated for 30 minutes, and the expansion ratio (volume ratio before and after heating) was 1:1.18.

[0053] The prepared foam is put into a closed mold of equal volume and heated at 150° C. The resulting expansion pressure is 0.11Mpa.

Embodiment 2

[0054] Example 2: Preparation of foam with thermal self-expansion function

[0055] Cutting: Cut the rigid foam according to the size of the product;

[0056] Spraying: Spray a layer of thermal self-expanding resin on the outer layer of the rigid foam. It adopts three-pass spraying method with a coating thickness of 0.3mm.

[0057] The prepared foam with thermal self-expansion function:

[0058] The initial tackiness of the finger touch, the finger presses the surface of the thermally self-expanding resin layer for 5 seconds, the resin layer sticks to the hand, but does not transfer to the finger;

[0059] The prepared foam was placed in an oven at 150°C and heated for 30 minutes, and the foaming ratio (volume ratio before and after heating) was 1:1.46.

[0060] The prepared foam is put into a closed mold of equal volume and heated at 150°C, and the resulting expansion pressure is 0.58Mpa.

Embodiment 3

[0061] Example 3: Preparation of foam with thermal self-expansion function

[0062] Cutting: Cut the rigid foam according to the size of the product;

[0063] Pouring: Put the cut rigid foam into the mold, and then pour the hot self-expanding resin into the mold; just open the mold and take it out.

[0064] Calculate the amount of thermally self-expandable resin required according to 1.1 times the volume of the cavity between the rigid foam and the mold (refers to the amount of thermally self-expandable resin that is 1.1 times the volume of the void between the rigid foam and the mold) .

[0065] The perfusion rate is controlled at 1.5kg / min.

[0066] The prepared foam with thermal self-expansion function:

[0067] Initial tackiness to the finger touch, pressing the surface of the thermally self-expanding resin layer with the finger for 8 seconds, the resin layer sticks to the hand, but does not transfer to the finger;

[0068] The prepared foam was placed in an oven at 150° C. and heate...

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Abstract

The invention discloses a foam body with a thermal self-expansion function and a preparation method thereof. The inner layer of the foam body with the thermal self-expansion function is rigid foam, and the outer layer is thermal self-expanding resin. The thermal self-expanding resin and the rigid foam are integrally formed, interface bubbles are fewer, the binding force is stronger, and uniformlyimproving the strength of products is facilitated. Meanwhile, the integrally formed foam structure has an effect suitable for forming shaped products. The foam body with the thermal self-expansion function is used for the preparation of sandwich composite structural parts, has excellent properties such as high strength, light weight, good interlayer adhesion, resistance to delamination and splitting and impact resistance, and can be applied to the field of sandwich structure composite parts of complex structures.

Description

Technical field [0001] The invention relates to the field of fiber composite molding, in particular to a foam with thermal self-expansion function and a preparation method thereof. Background technique [0002] Rigid foam material has the advantages of low density, strong energy absorption and buffering capacity, and good sound absorption performance. It is often used in the design of sandwich structure, making the sandwich structure material have excellent properties that are different from traditional structural materials, such as light weight , High rigidity and high strength, etc. It has broad application prospects in aerospace, automobile manufacturing, sports and leisure, etc. The most typical sandwich structure composite material in the prior art usually consists of a panel (carbon fiber or glass fiber reinforced material), a core material (hard foam), and a glue layer. The common preparation method is to coat and glue the hard foam Layer, and then wrapped with carbon cl...

Claims

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Application Information

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IPC IPC(8): B29C70/34B29C70/54
CPCB29C70/34B29C70/54
Inventor 蔡锦云李卫平谢容泉李步龙官江全
Owner XIAMEN HOWER MATERIAL
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