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Toughened epoxy compositions

An epoxy composition and a toughening technology, applied in the field of toughening epoxy compositions, can solve problems such as toughness transfer, and achieve the effect of high toughness

Pending Publication Date: 2021-02-02
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these tougheners generally improve the ductility and impact resistance of neat resins, the toughness is not always transferred to composites

Method used

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  • Toughened epoxy compositions
  • Toughened epoxy compositions
  • Toughened epoxy compositions

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0089] Preparation of Phenoxy Resin Blends

[0090] Charge to a one-liter 4-neck round bottom flask equipped with a mechanical stirrer and thermocouple 330 (320g) and placed under nitrogen atmosphere. Make The temperature was raised to 120° C. at 330 and PKHP-200 phenoxy resin (80 g powder) was slowly added while stirring rapidly for about 10 minutes. The mixture was then allowed to stir at 120°C for about one hour, or until the mixture was completely homogeneous. The solution was then immediately poured into dry glass jars and cooled under a nitrogen atmosphere.

[0091] Epoxy formulation preparation

[0092] Epoxy resin compositions were prepared by first preparing Composition A and Composition B separately and mixing prior to use. Composition A consists of 438、 Composed of 6508 and Licolub WE-4. Composition B consists of 331, Dyhard100SF and Omicure U410, Kane Ace MX 154 and phenoxy resin blend composition. The components of Composition A were weighed into a ...

example 1-2 and comparative example A-D

[0124] The epoxy compositions of Examples 1-2 and Comparative Examples A-D were prepared by blending Compositions A and B as discussed above, wherein the amounts listed in Table 3 are by weight in the final composition. The compositions of Comparative Examples B and C were toughened with only the core-shell rubber (2.5% and 5.0%). The composition of Comparative Example D was toughened with only phenoxy resin. The compositions of Examples 1 and 2 were toughened with a combination of core-shell rubber and phenoxy resin. The amounts of the components in the compositions and their physical properties are listed in Table 3 below.

[0125] table 3

[0126]

[0127] The data in Table 3 show that synergistic blends of core-shell rubber and phenoxy resins can provide improved epoxy and composite properties with little increase in viscosity. The transfer of toughness from the epoxy matrix to the composite is complicated by many factors including toughener type, toughener loading, ...

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Abstract

Disclosed is a toughened epoxy composition comprising (a) a first epoxy component comprising one or more epoxy resins having at least one oxazolidone ring structure; and (b) a second epoxy component comprising one or more liquid epoxy resins; (c) one or more latent epoxy curing agents; (d) one or more rubber toughening agents and (e) one or more phenoxy resin toughening agents.

Description

technical field [0001] The present invention relates to toughened epoxy compositions for bonding fiber reinforced composite materials. Background technique [0002] Epoxy-based adhesive compositions are reactive adhesive compositions comprising epoxy resins, curing agents and generally accelerators. After thermal activation, the epoxy group of the epoxy resin reacts with the curing agent through addition polymerization, thereby linking the epoxy resin compounds to obtain a cured product. Such cured products are known to have good mechanical properties and chemical resistance over cured products of other reactive adhesives. These features make epoxy adhesive compositions especially suitable for demanding applications where stringent mechanical requirements have to be met, for example in the automotive industry. [0003] Conventionally, fiber-reinforced composite materials consist of a thermosetting resin such as epoxy resin as a polymer matrix with reinforcing fibers such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/26C08J5/24C08G59/40C08L63/00
CPCC08G59/26C08G59/4021C08J2363/00C08L63/00C08L2205/035C08J5/243C08J5/249C08L51/04C08L71/123C08J5/042C08J5/047C08G59/1477C08G59/245C08J5/048C08L25/10C08L63/04C08L71/12
Inventor A·K·施密特T·奥维尔D·H·邦克B·巴厘杰帕黎
Owner DOW GLOBAL TECH LLC