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A glass fiber random structure sandwich material and its preparation method

A glass fiber, sandwich material technology, applied in chemical instruments and methods, glass/slag layered products, lamination auxiliary operations, etc., can solve problems such as low compression and shear performance, rapid collapse failure, high maintenance costs, etc. , to achieve the effect of simple and easy preparation process, realizing spatial structure and maintaining structural stability

Active Publication Date: 2015-10-28
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the honeycomb sandwich material has high shear stiffness and strength, high compressive modulus in the thickness direction, and low relative density, the manufacturing process of the honeycomb sandwich material is complicated and the maintenance cost is high during use.
In some cases, if there are cracks or pores in the panel, the honeycomb core material is easy to enter water and is not easy to discharge; under low temperature conditions, the water will expand after being frozen, destroying the bonding of nearby honeycomb cells, and debonding the panel and core material , which reduces the performance of the sandwich structure
The surface of the foam sandwich material is smooth and has low hygroscopicity, but the foam sandwich material has disadvantages such as low compression and shear performance, easy debonding and delamination of the panels and core materials, etc.
Honeycomb sandwich materials and rigid foam sandwich materials also have weaknesses of rapid collapse and destruction due to deformation of the honeycomb wall or cells

Method used

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  • A glass fiber random structure sandwich material and its preparation method
  • A glass fiber random structure sandwich material and its preparation method
  • A glass fiber random structure sandwich material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The structure diagram of glass fiber random structure sandwich material is as follows figure 1 As shown, the forming mold is fully cleaned, dried and coated with a release agent, and the prefabricated upper panel (1) and lower panel (3) are respectively laid on the upper and lower molds; 300tex glass fiber bundles are manually dipped Fully impregnated with unsaturated polyester resin glue and wound on the frame-shaped steel frame, pre-cured at 20°C for 2 hours, post-cured at 80°C for 1 hour, after curing and molding, the cured glass fiber bundles were removed from the frame-shaped steel frame, and finally Cut the cured glass fiber bundles into 30mm chopped glass fiber bundles by a cutting machine; mix the cut chopped glass fiber bundles with an unsaturated polyester resin molding glue system that accounts for 10% of the mass fraction of the chopped glass fiber bundles , stir with a four-fork stirrer for 2min, the preferred 30r / min of the rotating speed makes the chopped...

Embodiment 2

[0030] Fully clean the forming mold, apply a release agent after drying, and lay the prefabricated upper panel (1) and lower panel (3) on the upper and lower molds respectively; fully impregnate 600tex glass fiber bundles through the immersion dipping process The unsaturated polyester resin glue is wound on the frame-shaped steel frame, pre-cured at 30°C for 1 hour, and post-cured at 130°C for 2 hours. After curing, the cured glass fiber bundles are removed from the frame-shaped steel frame, and finally cured The glass fiber bundles are cut into 40mm chopped glass fiber bundles by a cutting machine; the cut chopped glass fiber bundles are mixed with an unsaturated polyester resin molding glue system that accounts for 15% of the chopped glass fiber bundle mass fraction, and The six-pronged stirrer was stirred for 5 minutes, and the rotating speed was preferably 40r / min, so that the chopped glass fiber bundles formed an irregular spatial framework structure; then the chopped glas...

Embodiment 3

[0032]Fully clean the forming mold, apply a mold release agent after drying, and spread the prefabricated upper panel (1) and lower panel (3) on the upper and lower molds respectively; use 900tex glass fiber bundles through a vertical dipping process to fully Impregnate the unsaturated polyester resin glue and wrap it on the frame-shaped steel frame, pre-cure at 30°C for 1 hour, and post-cure at 80°C for 1 hour. After curing and molding, remove the cured glass fiber bundle from the frame-shaped steel frame, and finally put The cured glass fiber bundles are cut into 50mm chopped glass fiber bundles by a cutting machine; the cut chopped glass fiber bundles are mixed with an unsaturated polyester resin molding glue system that accounts for 20% of the chopped glass fiber bundle mass fraction, Stir with an octagonal stirrer for 10min, and the preferred 30r / min of the rotating speed makes the chopped glass fiber bundles form an irregular spatial framework structure; then the chopped ...

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Abstract

The invention relates to a glass fiber irregular architecture sandwiched material as well as a preparation method thereof. The glass fiber irregular architecture sandwiched material is composed of an upper panel (1), a lower panel (3) and a chopped glass fiber bundle core material (2) with an irregular architecture; the chopped glass fiber bundle core material (2) with the irregular architecture forms an irregular polyhedral hollow structure by mutually overlapping chopped glass fiber bundles (4) at different angles and is fixedly connected with the upper panel (1) and the lower panel (3). The glass fiber irregular architecture sandwiched material provided by the invention cannot generate plastic yielding in a flat pressing loading process; the glass fiber irregular architecture sandwiched material without plastic yielding changes the common properties of the traditional sandwiched material, and overcomes the weakness that the traditional core material is rapidly collapsed and damaged; the preparation technology is simpler and more feasible.

Description

technical field [0001] The invention belongs to a sandwich material and a preparation method thereof, in particular to a glass fiber random structure sandwich material and a preparation method thereof. Background technique [0002] The sandwich material is a structural composite material composed of a high-strength skin (panel) and a lightweight core material. The structural advantage of the sandwich material is that it reduces the weight of the material while increasing the moment of inertia of the two skins, thereby improving the bending resistance of the material. Since its birth in the 1940s, sandwich materials have been widely used in aerospace, automobiles, ship hulls, construction, sports equipment and other fields due to their advantages such as light weight, high specific strength and specific stiffness, fatigue resistance, and good seismic performance. The current sandwich materials mainly include honeycomb sandwich materials, foam sandwich materials and lattice s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B17/02B32B17/06B32B38/08B32B38/00B32B38/16
Inventor 王晓钧沈亚祺代宝莹
Owner NANJING TECH UNIV
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