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Fast-cure resin formulations with consistent handling characteristics

A resin, curing agent technology, applied in the field of fast curing resin formulations with consistent processing characteristics, can solve the problem of difficult to find sticky materials

Pending Publication Date: 2020-10-30
CYTEC IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

See e.g. EP 2268720, however, materials with handling characteristics including tackiness suitable for use in processes occurring at ambient or slightly elevated temperatures such as cross-ply and repositioning applications remain difficult to find

Method used

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  • Fast-cure resin formulations with consistent handling characteristics
  • Fast-cure resin formulations with consistent handling characteristics
  • Fast-cure resin formulations with consistent handling characteristics

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0133] The epoxy resin formulations according to Table 8 below were prepared by mixing the first three ingredients at 170°C for 2 hours under low shear. The mixture was cooled to 50°C, then the remaining material was added. The resulting mixture was mixed for 10 minutes.

[0134] Table 8: Epoxy resin formulations of Example 1

[0135]

[0136]

[0137] Prepregs were prepared from the epoxy resin formulation of Example 1 as follows:

[0138] will consist of 3k fibers (eg from A carbon fiber fabric (2x2 twill weave; 200gsm area weight) made of SM T300 3K) was impregnated with the epoxy resin formulation of Example 1 to obtain a prepreg with a resin content of 38%. This prepreg was used to make an 8-ply 0 / 90° laminate, which was then subjected to curing at a curing temperature of 160° C. for 5 minutes. Curing takes place in steel matched die tools that are preheated to curing temperature. The resulting laminate was tested by DMA following ASTM 7028-07 and found to exh...

example 2

[0141] The epoxy resin formulations according to Table 9 below were prepared by mixing the first four ingredients at 170°C for 3 hours under low shear. The mixture was cooled to 50°C, then the remaining ingredients were added. The resulting mixture was mixed for 10 minutes.

[0142] Table 9: Epoxy resin formulations of Example 2

[0143] Element ％ Bisphenol A diglycidyl ether (DGEBA) 66.12 Tetrafunctional epoxy resin 21.08 Polyvinyl formal resin 1.70 Polyethersulfone 1.70 Dicyandiamide (DICY) 4.40 6-(2-(2-Methyl-1H-imidazol-1-yl)ethyl)-1,3,5-triazine-2,4-diamine 2.50 Substituted Urea Catalysts 2.50

[0144] Prepregs were prepared from the epoxy resin formulation of Example 2 as follows:

[0145] will consist of 3k fibers (eg from A carbon fiber fabric (2x2 twill weave; 200gsm area weight) made of SM T300 3K) was impregnated with the epoxy resin formulation of Example 2 to obtain a prepreg with a resin content of 38%....

example 3

[0148] The epoxy resin formulations according to Table 10 below were prepared by mixing the first four ingredients at 170°C for 2 hours under low shear. The mixture was cooled to 50°C, then the remaining ingredients were added. The resulting mixture was mixed for 10 minutes.

[0149] Table 10: Epoxy resin formulations of Example 3

[0150] Element ％ Epoxy Phenol Novolac 71.8 Polyvinyl formal resin 5.0 Bisphenol A diglycidyl ether (DGEBA) 9.9 540eqWt solid epoxy resin 6.0 Dicyandiamide (DICY) 4.5 6-(2-(2-Methyl-1H-imidazol-1-yl)ethyl)-1,3,5-triazine-2,4-diamine 2.7 pigment 0.1

[0151] Prepregs were prepared from the epoxy resin formulation of Example 3 as follows:

[0152] will consist of 3k fibers (eg from A carbon fiber fabric (2x2 twill weave; 200gsm area weight) made of SM T300 3K) was impregnated with the epoxy resin formulation of Example 3 to obtain a prepreg with a resin content of 38%. This prepreg was used...

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Abstract

The present invention relates to rapid-curing resin formulations as well as fiber-reinforced composite materials comprising the same and their use in the manufacture of molded articles, particularly where the manufacturing process requires high throughput and where resin formulations having consistent handling characteristics (e.g., tack and flexibility) would be preferable across normal to elevated laminating environments (as defined by temperatures between 20 DEG C and 60 DEG C). The present invention further relates to a manufacturing process for preparing an article, particularly a moldedarticle, from a fiber-reinforced composite material comprising a rapid-curing resin formulation.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Application No. 62 / 637,362, filed March 1, 2018. The entire content of this application is expressly incorporated by reference into this application. Background technique [0003] Fibrous layers of material, such as carbon fibers or glass fibers, or fabrics made of such materials, that have been partially or fully impregnated with resins, such as curable resins, are known as prepregs. Fiber reinforced resins, including prepregs, are used to form cured composite articles. Multiple layers of fiber reinforcement (eg, in prepreg) and resin can be laid up in a mold and then cured to form a cured composite article. Such cured composite articles can be used, for example, in automotive, aircraft or spacecraft structural components. In certain fields, such as automotive structural components, high throughputs are additionally required in addition to the structural and techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/24C08J5/04C08G59/40
CPCC08J5/042C08J2363/00C08G59/508C08G59/50C08J5/249C08J5/243C08G59/56C08G59/5073C08G59/4021C08G59/245C08K5/14C08L63/00C08L35/00C08L71/00C08L81/06C08J5/04C08G59/5086C08J2363/04C08L33/08C08L65/02C08L75/02C08L2203/30
Inventor A·吉布斯L·威廉姆斯S·科登
Owner CYTEC IND INC
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