Foam sandwich extensional organization composite material and method of producing the same

A composite material and overall structure technology, applied in the direction of chemical instruments and methods, lamination devices, lamination auxiliary operations, etc., can solve the problems of low cost and high production efficiency, and achieve high production efficiency, low environmental pollution and excellent product quality Effect

Inactive Publication Date: 2009-01-14
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is to design a composite material with a foam sandwich integral structure and its preparation method. The composite material has good integrity, does not delaminate, has a long service l

Method used

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  • Foam sandwich extensional organization composite material and method of producing the same
  • Foam sandwich extensional organization composite material and method of producing the same
  • Foam sandwich extensional organization composite material and method of producing the same

Examples

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Example Embodiment

[0026] The present invention designs the preparation method of described composite material simultaneously, and this preparation method is applicable to the composite material of foam sandwich overall structure described in the present invention, comprises the following steps:

[0027] 1. Preparation of foam sandwich layer

[0028] According to the preparation process of conventional closed-cell rigid foam materials, a composite material foam sandwich layer 1 is prepared, and the foam sandwich layer 1 is polyurethane (PU), polyvinyl chloride (PVC), polymethacrylimide (PMI ) and polyetherimide (PEI) and other materials. The reason why the present invention selects the closed-cell rigid foam material instead of the honeycomb foam material as the sandwich layer in the traditional technology is that the closed-cell rigid foam material has better moisture and heat resistance than honeycomb, and resin transfer molding can be used. Technical molding, no glue absorption, can also be ...

Example Embodiment

[0040] Example 1

[0041] The upper and lower layers of the designed composite material are biaxial Kevlar fiber plain fabric, the sandwich layer is rigid closed-cell polyurethane (PU) foam, and the RTM molding process uses epoxy resin. Its preparation method is as follows:

[0042] 1. Preparation of rigid closed-cell polyurethane (PU) foam sandwich layer

[0043] According to the weight ratio, weigh the liquid foaming raw material, stir it at high speed, and after the material expands and turns white, quickly pour it into the foaming mold, wait for the material to fill the mold and mature it, and then release the mold to obtain the foam sandwich layer.

[0044] Die (length × width × height) size: 250 × 200 × 17 (mm).

[0045] 2. Preparation of upper and lower fiber surfaces

[0046] Direct selection of biaxial Kevlar fiber plain weave fabric.

[0047] 3. Punch the needle hole

[0048] Use a punching machine to drill pinholes on the foam core material according to the nee...

Example Embodiment

[0057] Example 2

[0058] The upper and lower layers of the designed composite material are weft-knitted high-strength polyethylene fabric, the sandwich layer is rigid closed-cell polyurethane (PU) foam, and the RTM molding process uses vinyl resin. Its preparation method is as follows:

[0059] 1. Preparation of rigid closed-cell polyurethane (PU) foam core

[0060] According to the weight ratio, weigh the liquid foaming raw material, stir it at a high speed, and pour it into the foaming mold quickly after the material expands and turns white.

[0061] Mold (length × width × height) size (mm): 250 × 200 × 17mm.

[0062] 2. Preparation of Fiber Surface

[0063] Direct selection of weft-knitted high-strength polyethylene fabric.

[0064] 3. Punch the needle hole

[0065] Use a punching machine to drill pinholes on the foam core material according to the needle pitch x line spacing of 15 x 10 (mm), and the diameter of the pinholes is 1.2 mm. The pinhole density was 8500 ve...

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Abstract

The invention relates to a composite material with an integrated foamy sandwich structure and a preparation method thereof, the composite material comprises an upper finishing coat, a lower finishing coat and a foamy sandwich. The composite material of the invention is characterized in that the foamy sandwich is made from rigid foamed material with blind holes; and the foamy sandwich is sewed with the upper finishing coat and the lower finishing coat into a whole by seams and is molded at one time by adopting resin transfer molding technique; the outer surfaces of the upper finishing coat and the lower finishing coat are smooth and glossy. The preparation method is suitable for the composite material with an integrated foamy sandwich structure and includes the following work stages: 1. preparing the foamy sandwich; 2 preparing the upper finishing coat and the lower finishing coat; 3. punching pin holes; 4 seaming; 5. molding by the resin transfer molding technique. The composite material of the invention is good in integrity, long in service life, accurate in shape, dimension and structure, and superior in mechanical property.

Description

technical field [0001] The invention relates to composite material preparation technology, specifically a composite material with a foam sandwich overall structure formed by sewing and resin transfer molding technology (RTM) at one time and its preparation method. The international patent main classification number is proposed to be Int.Cl.B32B 7 / 00 (2006.01) I. Background technique [0002] The foam sandwich structure composite material is composed of high-strength upper and lower layers and a rigid foam sandwich layer (middle layer). The traditional molding process of foam sandwich structure composite materials is prefabricated bonding molding process. This process needs to pre-form the foam sandwich layer and the upper and lower layers of the composite material respectively, and process and trim them respectively, and then use an adhesive film to bond and cure the core material and the upper and lower layers to form an integral sandwich structure composite Material. Wi...

Claims

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Application Information

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IPC IPC(8): B32B5/18B32B5/06B32B37/00B32B38/08B29C39/18
Inventor 吴晓青夏凡李嘉禄
Owner TIANJIN POLYTECHNIC UNIV
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