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Extended room temperature storage of epoxy resins

A technology of epoxy resin and resin, which is applied in the field of curing combination of thermoplastic material toughened epoxy resin, resin and fiber reinforced material, which can solve the problems of prepregs that are difficult to handle and difficult to put into molds

Active Publication Date: 2016-11-30
HEXCEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conversely, prepregs that are too viscous can be difficult to handle and place into the mold

Method used

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  • Extended room temperature storage of epoxy resins
  • Extended room temperature storage of epoxy resins
  • Extended room temperature storage of epoxy resins

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0055] 3-ABOAB can be synthesized using known chemical procedures for the preparation of norbornanediamine (NBDA), or can be purchased commercially from chemical suppliers such as Mitsui Chemicals America, Inc. under the tradename 13p-BABB.

[0056] The amount of 3-ABOAB included in the uncured resin will depend on the amount and type of epoxy resin present in the uncured resin. The amount of 3-ABOAB should be sufficient to ensure complete cure of the uncured resin while maintaining a constant and relatively low level of heat release from the resin for at least 6 weeks after the resin is made. This amount can be calculated based on the functionality and amount of each epoxy resin in the formulation. The stoichiometric ratio between 3-ABOAB and epoxy resin in the epoxy resin component should be 0.65:1.0 to 1.1:0.8. A preferred stoichiometric ratio between 3-ABOAB and epoxy resin is 0.7:1 to 0.95:1.

[0057] The amount of 3-ABOAB required to provide complete cure at a temperat...

Embodiment 1

[0079] Exemplary uncured resin formulations according to the present invention are described in Table 1 . The uncured resin was prepared by mixing the epoxy resin component with 3-ABOAB as curing agent at room temperature (22°C). The two components are mixed thoroughly to form an uncured resin.

[0080] Table 1

[0081]

[0082] The viscosity of the uncured resin is suitable for making prepregs. When impregnated into the fiber reinforcement, the resulting prepreg will have tacky properties suitable for forming shaped articles. Exemplary prepregs can be prepared by impregnating one or more layers of unidirectional carbon fibers with the resin formulations of Table 1. Unidirectional carbon fibers were used to make prepregs in which the matrix resin amounted to about 35 wt% of the total uncured prepreg weight, with a fiber areal weight of about 190 grams per square meter (gsm). A variety of prepreg layups can be prepared using standard prepreg manufacturing procedures. Th...

Embodiment 2

[0085] Another exemplary resin formulation according to the present invention is described in Table 2. The uncured resin was prepared by mixing the epoxy resin component with polyethersulfone at room temperature to form a resin blend, and heating the resin blend to 120° C. for 60 minutes to completely dissolve the polyethersulfone. The mixture was cooled to 80°C, the remaining ingredients (polyamide pellets and 3-ABOAB curing agent) were added and mixed thoroughly to form an uncured resin.

[0086] Table 2

[0087]

[0088] The resin formulation was tested using the same DSC test procedure as in Example 1. After 6 weeks, the reaction progress of the uncured resin was essentially 0%. After curing at 177° C. for 2 hours at atmospheric pressure, the reaction progress was greater than 95%, confirming that the resin was fully cured. The viscosity of the uncured resin is suitable for making prepregs. When impregnated into the fiber reinforcement, the resulting prepreg will ha...

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Abstract

Uncured epoxy resin for use in making prepreg for aerospace applications. The resin includes an epoxy resin component comprising difunctional epoxy resin, trifunctional epoxy resin and / or tetrafunctional epoxy resin and a sufficient amount of [3-(4-aminobenzoyl) oxyphenyl] 4-aminobenzoate (3-ABOAB, as a curing agent, such that the uncured resin can be stored at room temperature of at least 6 weeks and wherein the uncured resin can be fully cured in no more than 2 hours at a temperature of between 175 DEG C and 185 DEG C.

Description

Background technique [0001] 1. Technical field [0002] This invention relates generally to epoxy resins, and more particularly to epoxy resins toughened with thermoplastic materials. Thermoplastic-toughened epoxy resins are used to prepare high-performance composite parts. More specifically, the present invention seeks to increase the out-time or shelf life of epoxy resins when stored at room temperature without adversely affecting the cure rate of the resin when cured at conventional curing temperatures. [0003] 2. Description of prior art [0004] Composite materials usually consist of a resin matrix and reinforcing fibers as two main components. A resin matrix containing one or more epoxy resins as a main component is widely used. Composite materials often need to be preformed in harsh environments such as in aerospace where the physical limits and properties of composite parts are critical. [0005] Pre-impregnated composite materials (prepregs) are widely used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/32C08G59/50
CPCC08G59/32C08G59/5033C08L63/00C08L77/00C08L81/06C08L79/08
Inventor Y-S·王
Owner HEXCEL
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