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Method of making and using shape memory polymer composite patches

a polymer composite patch and shape memory technology, applied in the field of making and using shape memory polymer composite patch, can solve the problems of composite material to become soft again, lose its molded shape, etc., and achieve the effect of reducing the time of composite repair, reducing the time of permanently fixing a damaged part, and affordable pri

Inactive Publication Date: 2010-08-05
CORNERSTONE RES GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0037]This patch and process reduces the time to repair composite parts and other material and eliminates the creation of volatile components that must not be released into the environment as per EPA requirements during the repair process. The combination of both of these factors makes this process highly transferable into mass production of patches for high-performance composites at an affordable price and for the mass production of patches for use in lower performance items as well. Additionally the patch can be molded on site by hand, without the use of significant amounts of equipment or special orders to pre-mold the composite patch to match the specific damaged area. Another benefit is that by using shape memory polymer as the resin the damaged part does not need to be removed from the larger component, for example removing the wing from the airplane, in order to mold the patch and repair the damage.
[0054]Therefore it is an object of the present disclosure to provide an epoxy-based polymer containing a crosslinked thermoset network which exhibits the shape memory effect described above which is useful in making the shape memory polymer patches.

Problems solved by technology

While some adhesives may require heat curing, choosing the correct shape memory polymer to use as the resin matrix will prevent this curing from causing the composite material to become soft again, and lose its molded shape, especially if using a light activated shape memory polymer resin.

Method used

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  • Method of making and using shape memory polymer composite patches
  • Method of making and using shape memory polymer composite patches
  • Method of making and using shape memory polymer composite patches

Examples

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example 4

[0118]In order to bond a shape memory polymer composite patch to stainless steel the area around the damaged portion of a part or the area near the portion of the part to be joined to another is scuff sanded and solvent wiped to ensure a clean, smooth bonding surface. Additionally scuff sand and solvent wipe the side of the patch to be bonded to the substrate to ensure a smooth bonding surface. Apply a thin, even layer of Loctite HYSOL U05-FL paste adhesive to repair area on stainless steel. Using the patch from Example 1 heat the patch above its transition temperature. Form patch to repair surface manually or with a heating blanket using vacuum pressure. Cure adhesive according to manufacturers recommendations using temperature controller connected to the heating blanket or other method. Remove vacuum blanket after cure.

[0119]The bonding of the shape memory polymer composite patch can be done to various other substrates, metal cans, car fenders, other composite parts, using the met...

example 1

[0148]As an example, 1.08 g aniline (amine reagent) was mixed with 0.066 g of methylenedianline (crosslinking diamine). The resulting solution was mixed with 4.17 g of bisphenol A diglycidyl ether to form an homogeneous solution. This solution was then injected into a glass mold, made with two, 2″×2″ glass with a Viton O-ring sandwiched in between, by syringe. The resulting material was cured in an oven pre-heated to 125C for 18 hours. This resulted in a clear solid shape memory polymer at room temperature that has a glass transition temperature (Tg) of about 104 C. The resulting material was also tough, as revealed by its resistance to cutting by razor blade hitting with a hammer, and with large elongation above its Tg, and excellent shape recovery. The rubbery modulus of this material was also significantly higher than the styrene-based SMP.

example 2

[0149]For a resin system with a Tg of 103° C., Bisphenol A diglycidyl ether at 78.94% weight is mixed with aniline at 19.88% weight and DETDA (major isomers: 3,5-diethyltoluene-2,4-diamine and 3,5-diethyltoluene-2,6-diamine) at 1.19% weight. All components are miscible liquids and are easily combined through mechanical mixing.

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Abstract

A method of repairing a composite component having a damaged area including: laying a composite patch over the damaged area; activating the shape memory polymer resin to easily and quickly mold said patch to said damaged area; deactivating said shape memory polymer so that said composite patch retains the molded shape; and bonding said composite patch to said damaged part.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This is a continuation of U.S. Utility Application Ser. No. 11 / 611,184 filed Dec. 15, 2006 which is a continuation of U.S. Utility application Ser. No. 11 / 569,902 filed Dec. 1, 2006, which is a national stage entry from PCT application PCT / US2005 / 019842 filed Jun. 4, 2005, which all claim priority benefit of U.S. Provisional Patent Application Ser. No. 60 / 577,003 filed Jun. 4, 2004. Additionally this application is a continuation of U.S. Utility application Ser. No. 12 / 090,760 filed Apr. 18, 2008, which is a national stage entry from PCT / US2006 / 062179 filed Dec. 15, 2006 which further claims priority from a U.S. Provisional Patent Application Ser. No. 60 / 750,502 filed Dec. 15, 2005.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH[0002]This application was made in part with government support under contract number NNK050A29C awarded by the National Aeronautics and Space Administration. The government has certain rights in the invention.BACK...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B7/12B05D5/10
CPCB29C73/10Y10T428/287Y10T428/1462Y10T428/2817Y10T428/2848Y10T428/249953Y10T428/249987Y10T442/2738
Inventor HOOD, PATRICK JOSEPHGARRIGAN, SEAN PATRICKAUFFINGER, III, FRANKTONG, TAT HUNGVINING, BENJAMIN JOHNHREHA, RICHARD DOUGLASBARNELL, THOMAS JOSEPH
Owner CORNERSTONE RES GROUP
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