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Non-chromate corrosion inhibiting polythioether sealants

A corrosion inhibitor, non-chromate technology, applied in other chemical processes, chemical instruments and methods, etc.

Active Publication Date: 2018-07-31
PRC DE SOTO INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, non-chromated corrosion inhibitors for use with polyepoxide-cured thiol-terminated polythioether sealants have not been developed or shown to be effective as aerospace sealants

Method used

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  • Non-chromate corrosion inhibiting polythioether sealants
  • Non-chromate corrosion inhibiting polythioether sealants
  • Non-chromate corrosion inhibiting polythioether sealants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0224] Type A sealant

[0225] The sealant of Example 1 is a Type A sealant suitable for brush application. The sealant of Example 1 consisted of two components, accelerator (referred to as Part A) and base (referred to as Part B). The accelerator formulations are shown in Table 1A.

[0226] Table 1A. Accelerator formulations.

[0227]

[0228]

[0229] *Available from PRC - DeSoto International, Inc., Sylmar, CA.

[0230] The preparation of Part A is described below. Will 828, 431, and Add a 1.25 gallon FlackTek Hauschild cup. The material was mixed at 1,000 rpm for 1 min using a Hauschild FlackTek Speedmixer DAC 3000HP. Carbon black, zinc borate and precipitated calcium carbonate are then added. The composition was mixed for 2 minutes at speeds of 200 rpm, 400 rpm, 600 rpm, 800 rpm and 1,000 rpm each for a total of 10 minutes of mixing. The coated calcium carbonate and 2-benzothiazolylthiosuccinic acid were then added. The composition was mixed for 2 minu...

Embodiment 2

[0247] Type A sealant

[0248] The sealant of Example 2 is a type A sealant suitable for brushing. The sealant of Example 2 consisted of two components, accelerator (referred to as Part A) and base (referred to as Part B). The accelerator formulations are shown in Table 2A.

[0249] Table 2A. Accelerator formulations.

[0250]

[0251]

[0252] *Available from PRC - DeSoto International, Inc., Sylmar, CA. Part A was prepared as described in Example 1.

[0253] The components of the base formulation (Part B) are shown in Table 2B.

[0254] Table 2B. Part B formulation.

[0255]

[0256] **Thiol terminated prepolymer available from PRC-DeSoto International, Inc., Sylmar, CA.

[0257] ***Phenolic adhesion promoter available from PRC-DeSoto International, Inc., Sylmar, CA.

[0258] Part B was prepared as described in Example 1.

[0259]The sealant of Example 2 was prepared by combining 17.25 parts by weight of Part A with 100 parts of Part B. The composition was ...

Embodiment 3

[0267] Class B sealant

[0268] The sealant of Example 3 is a Type B sealant and is suitable for sealing chamfers. The sealant of Example 3 consisted of two components, accelerator (referred to as Part A) and base (referred to as Part B). The accelerator formulations are shown in Table 3A.

[0269] Table 3A: Accelerator formulations.

[0270]

[0271] *Available from PRC - DeSoto International, Inc., Sylmar, CA.

[0272] The accelerator formulation was prepared as described in Example 1.

[0273] The base formulation (Part B) is shown in Table 3B.

[0274] Table 3B. Part B formulation.

[0275]

[0276]

[0277] **Thiol terminated prepolymer available from PRC-DeSoto International, Inc., Sylmar, CA.

[0278] ***Phenolic adhesion promoter available from PRC-DeSoto International, Inc., Sylmar, CA.

[0279] Part B was prepared by the following method. In a 300XL FlackTek Hauschild cup, add polysulfide prepolymer, T-3920, T-3921, and 75108. The composition was ...

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Abstract

Compositions comprising thiol-terminated polythioether prepolymers, polyepoxides and non-chromate corrosion inhibitors suitable for use in aerospace sealant applications are disclosed. Sealants prepared using the compositions adhere to a variety of aerospace substrates following exposure to aerospace fluids.

Description

technical field [0001] The present disclosure relates to non-chromated corrosion inhibiting polythioether sealants. The sealant composition is based on a thiol-epoxy, amine-cured chemistry and contains non-chromated corrosion inhibitors. The composition is useful in aerospace sealant applications. Background technique [0002] Aerospace sealants must meet demanding mechanical, chemical and environmental requirements. Aerospace sealants can be applied to a variety of surfaces including metal surfaces, primer coats, intermediate coats, finished coats and aged coats. Sealants comprising sulfur-containing prepolymers that exhibit acceptable fuel resistance, heat resistance, and flexibility for aerospace applications are described, for example, in US Patent No. 6,172,179. In sealants such as those described in U.S. Application Publication Nos. 2006 / 0270796, 2007 / 0287810, and 2009 / 0326167, sulfur-containing prepolymers such as thiol-terminated polythioether prepolymers can be r...

Claims

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Application Information

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IPC IPC(8): C08G65/32C08J7/00C08G75/00C08G75/04C08L81/00
CPCC08G65/32C08G75/00C08G75/04C08L81/00C09K3/1012C08G75/12C08J7/00C08K5/005C08L63/00C08L63/04C23F11/188C08G65/326
Inventor B·沃尼尔森A·斯托特S·马尼恩B·拜尔蒂诺N·斯瑞瓦特桑
Owner PRC DE SOTO INT INC
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