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Erosion and corrosion resistant overlay coating systems for protection of metal components

A corrosion-resistant coating and corrosion-resistant technology, applied in coatings, anti-corrosion coatings, polyurea/polyurethane coatings, etc., can solve problems such as molecular weight loss, polymer matrix mechanical performance degradation, etc.

Pending Publication Date: 2021-10-01
PRAXAIR ST TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is not a typical characteristic of this class of polymers, as the heat resistance of polyurethane is generally limited to about 300-350F due to the reaction of polyols with isocyanates to form urethane bonds (or the similar reaction of amines to isocyanates to form urea bonds) reaction) is thermodynamically reversible, and at higher temperatures, the reverse depolymerization reaction dominates, which leads to molecular weight loss and subsequent degradation of the mechanical properties of the polymer matrix

Method used

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  • Erosion and corrosion resistant overlay coating systems for protection of metal components
  • Erosion and corrosion resistant overlay coating systems for protection of metal components
  • Erosion and corrosion resistant overlay coating systems for protection of metal components

Examples

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Embodiment

[0080] Liquid coatings of example formulations 1, 2, 3 and 4 were produced. Exemplary liquid coatings consist of two-component systems. The base components consisted of solutions of different polyols, pigments, solvents and other additives in specific amounts and types as shown in Table 1. Table 1 provides a tabular summary of each of the tested Example Formulations 1-4. Each example formulation consists of the following items: certain weight percents of one or more polyols 1-3; isocyanates 1-3; pigments 1-3; additives and solvents. The curing agent component consisted of a solution of the specified amounts of polyisocyanates, also as shown in Table 1. The curing agent and base are mixed to give a ratio of 1.2 equivalents of isocyanate to 1.0 equivalents of alcohol. In the experiments in Table 1, the compositions of Isocyanate 1, Isocyanate 2 and Isocyanate 3 were controllably varied. The polyol compositions (34% by weight Polyol 1, 35% by weight Polyol 2, 31% by weight Po...

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Abstract

Polyurethane-based coatings which exhibit superior erosion and heat resistance combined with antifouling and chemical resistance that are useful for protection of metal components are provided. The coatings are characterized by enhanced particle erosion resistance and enhanced heat resistance and are derived from specific multicomponent slurry compositions.

Description

technical field [0001] The present invention relates to novel polyurethane-based formulations suitable for the production of protective coatings and exhibiting an excellent combination of erosion and heat resistance as well as fouling and chemical resistance. The coatings of the present invention are particularly beneficial for the protection of metal parts in turbomachinery and are suitable for added functionality as part of a corrosion resistant coating system having an anti-corrosion primer as well as a separate wrap-type coating. Background technique [0002] Corrosion-resistant wrap-around coating systems derived from slurry and based on ceramic binders filled with functional pigments have been used for decades to form highly corrosion- and heat-resistant protective coatings such as those used to protect turbomachinery ), and is still in use today. Original equipment manufacturers (OEMs) have adopted such coatings as high-performance protective coatings in the manufact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/08C09D7/61C08K3/22
CPCC08K3/22C09D5/08C09D7/61C09D175/06C08G18/44C08G18/73C08G18/792C08G18/80C09D5/084C09D5/103C09D7/62C09D7/66C09D7/70C23F11/173
Inventor M·W·珀帕尔I·贝洛夫
Owner PRAXAIR ST TECH INC
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