Composite materials

A composite material and semi-preg technology, applied in the field of composite materials, can solve problems such as reducing the viscosity and drapability of semi-preg, not recommending semi-preg, and delaying adhesion.

Inactive Publication Date: 2013-01-30
HEXCEL COMPOSITES SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While this can be achieved, the increase in viscosity reduces the stickiness and drapability of the semi-preg and only delays the inevitable sticking, thus allowing a limited storage time
Due to these disadvantages, semi-pregs without a backing sheet are not currently recommended

Method used

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  • Composite materials
  • Composite materials
  • Composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089]

Embodiment 2

[0091]

Embodiment 3

[0093] Epikote 816MV 95%

[0094] Sylvagel 1000 5%

[0095] The following viscosities were obtained for shear rates when measured using a Bohlin Gemini Rheometer with 40mm parallel plates.

[0096] Table 1

[0097] Shear rate s -1

Example 2 (Pas)

Example 3 (Pas)

0.11

4148

2242

1.05

538

314

10.39

111

46

[0098] 103.11

40

5

[0099] The shear thinning properties of Examples 2 and 3 are clearly shown.

[0100] A backing layer is then applied to one of the outer surfaces (up to 200 g / m2 of material).

[0101] Such assemblies then have the ability to be pressed together without a polyethylene interlayer. This has been measured using the following test method, which presses two plies of material together such that the backing layer acts as the interface between the two plies.

[0102] The backing layer has been shown to distribute itself evenly onto the once adjacent substrate surfa...

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Abstract

A curable sheet-like composite material comprising curable resin and at least one layer of structural fibres, and comprising an outer backing layer having a shear- dependent rheology, whereby the backing layer exhibits essentially no flow at rest on the outer surface of the composite material and exhibits a viscous flow response to induced shear.

Description

technical field [0001] The present invention relates to composite materials, particularly curable prepregs and semipregs. Background technique [0002] Composite materials have well-documented advantages over traditional materials of construction, especially in providing superior mechanical properties at extremely low material densities. Therefore, the use of such materials is becoming more and more common, and their applications range from "industrial" and "sports and leisure" to high-performance aerospace components. [0003] Prepregs, comprising an arrangement of fibers impregnated with a resin, such as epoxy resin, are widely used in the production of such composite materials. Typically, as many plies of such prepregs are laid down as desired and the resulting laminate is cured, typically by exposure to elevated temperatures, to produce a cured composite. [0004] A particular type of prepreg is the so-called semi-preg, which comprises an arrangement of fibers only par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/24
CPCC08J5/24B32B2262/101B32B27/12B32B2262/106B32B27/38Y10T428/249921C08J5/244C08J5/249B32B5/00B32B17/06B32B5/28C08J5/04C08K7/02C08L101/00
Inventor M.惠特
Owner HEXCEL COMPOSITES SAS
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