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2-phenylmidezole-phosphate as accelerator for acid anhydride curing agent in epoxy composition in a separated container

A technology of epoxy composition and dihydrogen phosphate, applied in the field of 2-phenylimidazole phosphate and epoxy resin, can solve problems such as negative impact on composition storage stability

Inactive Publication Date: 2005-03-02
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Accelerators such as imidazole, although they can be used with anhydrides to increase reactivity, however, such accelerators have a negative impact on the storage stability of the composition

Method used

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  • 2-phenylmidezole-phosphate as accelerator for acid anhydride curing agent in epoxy composition in a separated container
  • 2-phenylmidezole-phosphate as accelerator for acid anhydride curing agent in epoxy composition in a separated container
  • 2-phenylmidezole-phosphate as accelerator for acid anhydride curing agent in epoxy composition in a separated container

Examples

Experimental program
Comparison scheme
Effect test

example 1～7

[0035] The following example demonstrates that by 2-phenylimidazole (2-PI), 1-methylimidazole (1-MI), 2-methylimidazole (2-MI), imidazole (IM), 4-methylimidazole (4 -MI), 2-ethylimidazole (2-EI) and 2-ethyl-4-methylimidazole (24-EMI) and 85% phosphoric acid in the process of preparing imidazole phosphate in a molar ratio of 1:1. The procedure used to prepare the imidazole phosphate is as follows:

[0036] Add 100 mL of methanol and an appropriate amount of required substituted imidazole, such as 36.0 g (0.25 mol) of 2-phenylimidazole (2-PI ). After the imidazole was completely dissolved, 85% phosphoric acid was added dropwise over a period of 15 minutes. After the addition was complete, the resulting slurry was mixed for 15 minutes. The solid product was isolated by filtration with a Buchner funnel, washed with 50 mL of fresh methanol, and dried in air. The amount of imidazole phosphate recovered was 99% of theoretical yield.

[0037] The amounts of reactants, the imidazo...

example 8～14

[0040] These 100% solids epoxy system examples demonstrate imidazole phosphate as an accelerator for anhydride cured epoxy resin compositions. Compositions were prepared by thoroughly mixing the following ingredients:

[0041] Epon 828 100.0g

[0042] Methylhexahydrophthalic anhydride 90.0g

[0043]Imidazole phosphate 0.5g

[0044] The names of these imidazole phosphates are as follows:

[0045] 2-Phenylimidazole Phosphate (2-PIP)

[0046] 1-Methylimidazolium Phosphate (1-MIP)

[0047] 2-Methylimidazole Phosphate (2-MIP)

[0048] Imidazole Phosphate (IMP)

[0049] 4-Methylimidazole Phosphate (4-MIP)

[0050] 2-Ethylimidazole Phosphate (2-EIP)

[0051] 2-Ethyl-4-methylimidazolium phosphate (24-EMIP)

[0052] These compositions were tested by DSC to determine the onset temperature of the reaction and the resulting peak or maximum temperature. 5-10 mg of the compositions of Examples 8-14 were placed in a DSC pan and sealed. DSC analysis was performed from room temperat...

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PUM

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Abstract

A heat curable, a one-component epoxy protective or decorative coating or adhesive composition comprising an epoxy resin, acid anhydride latent heat activated curing agent and an accelerator for the acid anhydride curing agent characterized in that 2-phenylimidazole phosphate salt is the accelerator.

Description

Background of the invention [0001] The present invention relates to latent curing agents and accelerators for epoxy resins, especially one-pack epoxy compositions. A "latent" curing agent is one that remains inert in the formulated system when exposed to normal ambient conditions, but rapidly reacts with the epoxy resin at elevated temperatures. An "accelerator" is a material that accelerates the reaction between the epoxy resin and the curing agent. A typical "one-pot" epoxy composition is a blend of epoxy resin, curing agent and accelerator, and various additives and fillers. [0002] Current one-pot epoxy compositions may contain anhydrides as latent curing agents. Such compositions provide excellent shelf life, yet require very high temperatures to cure. Accelerators such as imidazole, although they can be used with anhydrides to increase reactivity, however, such accelerators have a negative impact on the storage stability of the composition. [0003] There is current...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D233/56C07D233/54C08G59/50C08G59/58C08G59/68
CPCC08G59/58C08G59/5093C08G59/688C07D233/64
Inventor D·N·沙赫W·E·斯塔纳
Owner AIR PROD & CHEM INC