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Controlled-release amine-catalyzed, sulfur-containing polymer and epoxy compositions

A composition and polymer technology, applied in the fields of compounds of group 4/14 elements of the periodic table, chemical instruments and methods, organic chemistry, etc.

Active Publication Date: 2015-08-12
PRC DE SOTO INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, once the components are mixed, the thiol and epoxy groups react, and depending at least in part on temperature and the type of amine catalyst, the pot life is limited to less than 2-12 hours

Method used

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  • Controlled-release amine-catalyzed, sulfur-containing polymer and epoxy compositions
  • Controlled-release amine-catalyzed, sulfur-containing polymer and epoxy compositions
  • Controlled-release amine-catalyzed, sulfur-containing polymer and epoxy compositions

Examples

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preparation example Construction

[0196] Trialkylsilane-terminated polysulfides and their preparation are disclosed, for example, in US Patent No. 4,902,736. In certain embodiments, the polysulfide comprises a thiol-terminated polysulfide such as under the name Commercially available from Akzo Nobel and under the name Those commercially available from Toray.

[0197] The terminal thiol groups of the thiol-terminated polysulfide can be converted to trialkylsilane groups by, for example, reacting the thiol-terminated polysulfide with a halosilane such as that of formula (9) in a base The reaction is carried out in the presence of a neutral catalyst, including an amine catalyst such as triethylamine. Examples of suitable halosilanes include trimethylchlorosilane, trimethylbromosilane, trimethyliodosilane, dimethylphenylchlorosilane, and chloromethyldimethylsilyl chloride. Examples of suitable halosilanes further include triethylchlorosilane, triethylbromosilane, triethyliodosilane, diethylphenylchlorosilane,...

Embodiment 1

[0260] Controlled Release Catalyst Preparation

[0261] 9.37g of 13-6 (from Air Products and Chemicals, Allentown, PA) and 0.63 g of 1,8-diazabicyclo-5,4,0-undecene-7 (DBU) were blended at 80°C for 30 minutes. The mixture was rapidly cooled to room temperature and then ground to a powder with an average particle size of 20-50 microns.

Embodiment 2

[0263] Controlled Release Catalyst Preparation

[0264] 9.00g of 13-6 (from Air Products and Chemicals, Allentown, PA) and 1.00 g of 1,8-diazabicyclo-5,4,0-undecene-7 (DBU) were blended at 80°C for 30 minutes. The mixture was rapidly cooled to room temperature and then ground into a powder.

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Abstract

Compositions comprising sulfur-containing polymers such as polythioethers and polysulfides, polyepoxides, and controlled-release amine catalysts useful in aerospace sealant applications are disclosed. The compositions exhibit extended pot life and the rate of curing can be tailored for specific applications.

Description

technical field [0001] The present disclosure relates to compositions comprising sulfur-containing polymers such as polythioethers and polysulfides, polyepoxides and controlled release amine catalysts. The compositions are useful in aerospace sealant applications where they exhibit extended pot life and provide controlled cure rates. Background of the invention [0002] Sealants used in aerospace and other applications must meet demanding mechanical, chemical and environmental requirements. The sealer can be applied to a variety of surfaces, including metal surfaces, primer coats, mid-coats, overcoats, and aged coatings. Sealant compositions comprising sulfur-containing polymers that exhibit acceptable fuel resistance, heat resistance, and flexibility for aerospace sealant applications are described in US Patent No. 6,172,179. In sealants such as those described in U.S. Publication Nos. 2006 / 0270796, 2007 / 0287810, and 2009 / 0326167, a sulfur-containing polymer, such as a th...

Claims

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Application Information

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IPC IPC(8): C09J121/02B32B15/08C07F7/18C08F8/34C08L83/00F16B19/04
CPCC09J181/02C08L83/00C08F8/34B32B15/08C08G75/02C08L81/02
Inventor R·凯莱德吉安L·G·安德森林仁和
Owner PRC DE SOTO INT INC
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