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bonding of composite materials

A technology of composite substrate and matrix resin, applied in the direction of surface pretreatment bonding method, adhesive, bonding method, etc.

Active Publication Date: 2017-09-29
CYTEC IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Said co-bonding or secondary bonding of pre-cured composite structures has the limitation that the bonding mechanism occurs only via mechanical interlocking without the formation of chemical bonds as in co-curing bonds
Current state-of-the-art bonding methods are not capable of meeting these requirements

Method used

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  • bonding of composite materials
  • bonding of composite materials
  • bonding of composite materials

Examples

Experimental program
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Effect test

example

[0069] The following examples are provided to illustrate certain aspects of the invention. In the following examples, the amounts shown in the tables are in parts by weight ("pbw") unless otherwise indicated.

example 1

[0071] Four curable release ply resin mixtures were prepared based on the formulations shown in Table 1 . Resin mixtures labeled Resin-17, Resin-11, Resin-8 were prepared using the same formulation as the resin mixture labeled as Control, except that 4,4'-diaminodiphenylsulfone (4,4'-DDS) The amount of curing agent changed from 20.9 parts to 17pbw, 11.3pbw, and 8.3pbw respectively.

[0072] Table 1

[0073] Element

[0074] The resin mixtures were mixed using a hot melt method and each of the above resin mixtures was subsequently coated onto a polyester based fabric material (Porcher 8115) from Porcher Industries. The resulting resin-impregnated fabric layer was then used as release ply material.

[0075] In the prepared peel ply material by manual stacking of 10 layers of CYCOM 977-2 (a prepreg material containing carbon fibers impregnated with an epoxy-based matrix resin, commercially available from Cytec Engineered Materials) Each of , wherein the exfoliated la...

example 2

[0083] Retention of reactive functional groups on the surface of the partially cured release layer was confirmed via investigation of the release layer material using Fourier Transform Infrared (FT-IR) spectroscopy. FT-IR spectroscopy is an efficient spectroscopic tool for characterizing functional groups and allows identification of structural components of materials. The release ply was formed from a resin composition having an insufficient amount of curing agent (ie, curing agent) and the control release ply was formed from a resin composition having a 1:1 epoxy:curing agent ratio. The release layer compositions are shown in Table 3.

[0084] table 3

[0085] Element

Control peel layer

Peel ply with insufficient curing agent

Phenolic novolac epoxy resin; functionality = 3.8

50.00

50.00

Diglycidyl ether of bisphenol A

25.00

25.00

Triglycidyl ether of aminophenol

20.00

20.00

Novolac epoxy resin based on dicyclope...

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Abstract

The present invention relates to release plies for surface preparation and a method of surface preparation prior to adhesive bonding. A resin-rich release layer is applied to a curable, resin-based composite substrate followed by co-curing. After co-curing, the composite substrate is fully cured while the matrix resin in the release layer remains partially cured. When the release layer is removed, a rough, bondable surface with chemically active functional groups is exposed. The composite substrate having the chemically active, bondable surface can be bonded to another composite substrate to form a covalently bonded structure.

Description

Background technique [0001] Adhesive bonding is conventionally used as a method of joining composite structures such as those used in the aerospace industry. Currently, adhesive bonding of composite structures is primarily performed in one of three ways: (1) co-curing, (2) co-bonding, and (3) secondary bonding. [0002] "Co-curing" involves joining uncured composite parts by simultaneous curing and bonding, wherein the composite parts are cured together with an adhesive, creating a chemical bond. However, it is difficult to apply this technique to the bonding of uncured prepreg to manufacture large structural parts with complex shapes. Uncured composite materials, such as prepregs, are tacky (ie, tacky to the touch) and lack the rigidity necessary to support themselves. Therefore, uncured composites are difficult to handle. For example, it is difficult to assemble and bond uncured composites on tools with complex three-dimensional shapes. [0003] "Co-bonding" involves joi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D7/00B32B5/02C08J5/24C09J5/02
CPCC09J5/02C09J2463/003B32B2037/1253B29C70/54B29C66/721B29C65/4835B29C65/5057B29C66/1122B29C66/30322B29C66/45B29C66/71B29C66/7212B29C66/72143B29C66/73161B29C66/73751B29C66/7394B29C66/73941B29C65/02B29C66/72141C08J2363/04C08J2463/02C09J163/00B32B5/02B32B5/12B32B2260/046B32B2262/02B32B2262/10Y10T428/249921B32B7/06B32B7/12B32B2305/188B32B2315/085B32B2363/00B29C66/0224C08J5/243B29K2309/08B29K2307/04B29K2277/10B29K2223/06B29K2267/00B29K2063/00B32B27/04C09J5/04B32B27/38B32B37/0038B32B37/025B32B37/12B32B38/10B32B2038/0076B32B2305/74B29L2031/30B32B27/20B32B37/1207B32B2605/18C08J2363/00C09J163/04
Inventor 李奥纳·麦克亚当斯达利普·K·柯里
Owner CYTEC IND INC