Elastomeric Coating Composition for Metal Water Pipes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing anti-corrosive coating compositions for metal pipes, particularly those used in the water supply industry, fail to meet the stringent requirements of American Water Works Association Specification C222 for polyurethane coatings, including protection against corrosion and abrasion, while also ensuring safety and durability.
Innovation Solution
A two-component system comprising an isocyanate component and an isocyanate-reactive component, specifically a polymeric isocyanate and isocyanate-terminated prepolymer, combined with a polyol component and polyetheramine, forms an elastomeric composition that is applied as a coating to metal pipes, providing enhanced protection against corrosion and abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional anti-corrosive coating compositions are applied to metal pipes, then basic corrosion protection is provided, but the coatings fail to meet the stringent requirements of AWWA C222 for tensile strength, elongation, hardness, and impact resistance
Solution Approach 1:
The patent employs a composite elastomeric composition comprising multiple polyol components (hydrophobic polyol, polyether polyol, and polyaminopolyol) combined with isocyanate component. This composite material structure provides simultaneous improvement in tensile strength, elongation, hardness, and impact resistance, meeting the stringent AWWA C222 requirements while maintaining corrosion and abrasion protection.
Solution Approach 2:
The patent modifies the chemical composition parameters of the coating by incorporating specific ratios of hydrophobic polyol, polyether polyol with weight average molecular weight greater than 500 g/mol, and polyaminopolyol. These parameter changes in the molecular structure and composition enable the coating to achieve the required mechanical properties including tensile strength, elongation, hardness, and impact resistance specified in AWWA C222.
2Reliability
If polyurethane coating compositions are used to protect metal pipes from corrosion, then basic protection is achieved, but the coatings do not satisfy the stringent safety and durability standards for water supply industry
Solution Approach 1:
The patent divides the coating system into distinct functional components: isocyanate component and polyol component, with the polyol component further segmented into hydrophobic polyol, polyether polyol, and polyaminopolyol. This segmentation allows each component to contribute specific properties that collectively meet the durability and safety requirements of AWWA C222 while maintaining a manageable formulation system.
Solution Approach 2:
The elastomeric composition is designed to provide multiple functions simultaneously: corrosion protection, abrasion resistance, tensile strength, elongation, hardness, and impact resistance. This multi-functional coating system satisfies the comprehensive durability and safety standards of the water supply industry through a single integrated composition rather than requiring multiple separate treatments.
3Object-affected harmful factors
If existing coating compositions are applied to metal pipes, then some level of protection is provided, but the coatings fail to provide adequate protection against both corrosion and abrasion simultaneously
Solution Approach 1:
The patent creates a composite elastomeric coating formulation that integrates hydrophobic polyol for corrosion resistance, polyether polyol for flexibility and elongation, and polyaminopolyol for enhanced mechanical strength and abrasion resistance. This composite approach enables simultaneous protection against both corrosion and abrasion while maintaining a practical and manufacturable coating system that meets AWWA C222 specifications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The elastomeric coating composition effectively satisfies the requirements of AWWA C222 by offering improved tensile strength, elongation, hardness, and impact resistance, ensuring the durability and safety of metal water pipes.
Implementation Method 1
The elastomeric composition is the reaction product of an isocyanate component and an isocyanate-reactive component
Data Source
AI summary
A system for forming an elastomeric composition for application to a substrate includes an isocyanate component and an isocyanate-reactive component. The isocyanate component includes a polymeric polyisocyanate and optionally an isocyanate-terminated prepolymer. The isocyanate-reactive component is reactive with the isocyanate component and includes a polyol component and a polyetheramine. The polyol component is a mixture of (a) a hydrophobic polyol; (b) a polyether polyol different than the hydrophobic polyol and having a weight average molecular weight greater than 500 g/mol; and (c) a polyaminopolyol. The elastomeric composition is formed as the reaction product of the isocyanate component and the isocyanate-reactive component and may be applied as an elastomeric coating layer on a substrate such as a steel pipe. The steel pipe having the applied elastomeric coating layer satisfies the standard for use in the water supply industry as set forth in AWWA C222.