Mineral Wool Binder Composition for High-Temperature CUI Resistance
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Solution Overview
Problem
Corrosion under insulation (CUI) in steel structures is a significant economic issue due to the retention of moisture by thermal insulation materials, leading to increased corrosion rates, especially in the oil and gas industry, where existing mineral wool products with mineral oil fail to provide adequate water repellency at higher temperatures.
Innovation Solution
A mineral wool product with mineral fibers bound by a binder composition comprising a phenol-formaldehyde-based resin and a hydrophobic agent containing silicone compounds, such as reactive silicone resins and silanes, which inhibits corrosion by reducing water absorption and enhancing drying times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mineral wool products with mineral oil are used as insulation, then water repellent requirements according to EN13472 can be met, but water absorption remains too high and water repellent properties are lost at temperatures above 150°C
Solution Approach 1:
The patent changes the chemical composition parameters of the hydrophobic agent from mineral oil to a silicone-based system comprising polyalkylethoxysiloxane, polymethylethoxysiloxane, polyphenylethoxysiloxane, polyphenylsiloxane, or polyphenylmethylsiloxane. This parameter change enables the material to maintain water repellency at elevated temperatures up to 650°C while reducing water absorption, directly resolving the contradiction between initial water repellency and high-temperature performance
Solution Approach 2:
The patent creates a composite binder system combining phenol-formaldehyde resin with silicone-based hydrophobic agents. This composite material integrates the binding properties of phenol-formaldehyde resin with the superior high-temperature water repellency of silicone compounds, achieving both structural integrity and enhanced corrosion protection that neither component could provide alone
2Loss of energy
If thermal insulation materials surround steel structures to avoid heat loss, then thermal efficiency is improved, but water is kept in contact with the steel structure for longer time leading to increased corrosion
Solution Approach 1:
The patent introduces a silicone-based hydrophobic agent as an intermediary substance between the mineral wool insulation and the steel structure. This intermediary creates a water-repellent barrier that prevents water from being retained against the steel surface, thereby eliminating the corrosion risk while preserving the thermal insulation function
Solution Approach 2:
The patent extracts the water-retention function from the insulation system by applying a hydrophobic coating to the mineral wool. This separation allows the insulation to maintain its thermal efficiency while the hydrophobic treatment actively removes the harmful water retention effect, preventing CUI
3Reliability
If protective coating layers like zinc or aluminum are applied to steel parts, then corrosion protection is improved, but costs become extremely cost-intensive and economically unacceptable for extensive pipeline systems
Solution Approach 1:
The patent replaces expensive metallic protective coatings with a cost-effective organic silicone-based hydrophobic treatment applied to mineral wool insulation. This cheaper alternative provides sufficient corrosion protection through water repellency without the high material and application costs of zinc or aluminum coatings, making it economically viable for extensive pipeline systems
Solution Approach 2:
The patent enables the insulation system to provide its own corrosion protection through the inherent water-repellent properties of the silicone-based hydrophobic agent. The mineral wool insulation serves dual functions: thermal insulation and corrosion protection, eliminating the need for separate expensive protective coating systems
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 solution effectively provides excellent insulation while minimizing corrosion under insulation, maintaining thermal efficiency and structural durability even at elevated temperatures, thus reducing maintenance costs and energy inefficiencies.
Implementation Method 1
a hydrophobic agent comprising (i) at least one silicone compound, such as silicone resin, such as a reactive silicone resin
Implementation Method 2
as insulation of a metallic structure, said structure having an operating temperature between 0-650° C.
Implementation Method 3
mineral fibers bound by a binder resulting from the curing of a binder composition comprising a phenol-formaldehyde-based resin
Data Source
AI summary
Mineral wool product are disclosed. In one example, the mineral wool product can include mineral fibers bound by a binder resulting from the curing of a binder composition that includes a phenol-formaldehyde-based resin, and/or a carbohydrate containing component. Methods of inhibiting corrosion when insulating a metallic structure are also disclosed.