Polyurethane Pultrusion Composite Coating Adhesion
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Solution Overview
Problem
Polyurethane pultrusion composite materials experience poor adhesion with existing weatherable fluorocarbon coatings, leading to peeling and exposure when used outdoors for extended periods, especially under extreme weather conditions.
Innovation Solution
A polyurethane pultrusion article comprising a polyurethane resin matrix with isocyanate and isocyanate-reactive components, including polyether polyols and reactive flame retardants, combined with a reinforcement material like glass fibers, and a coating layer prepared from fluoroalkene-vinyl ether or polyvinylidene fluoride, applied using various coating methods to ensure strong affinity between the coating and the composite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior art fluorocarbon coatings are applied to polyurethane pultrusion composite materials, then weatherability is improved, but adhesion deteriorates causing peeling
Solution Approach 1:
The patent modifies the chemical composition parameters of the polyurethane resin matrix by incorporating specific polyether polyols with defined functionality and hydroxyl numbers, creating a surface chemistry that enhances coating adhesion while preserving weatherability
Solution Approach 2:
The patent creates a composite polyurethane system combining polyether polyols with flame retardants and reinforcing materials, where the synergistic interaction between components improves both adhesion to fluorocarbon coatings and overall material performance
2Duration of action of stationary object
If polyurethane pultrusion composite materials are used for long-term outdoor application, then structural performance is maintained, but coating adhesion deteriorates under extreme weather conditions
Solution Approach 1:
The patent incorporates flame retardants and specific polyether polyols into the polyurethane resin matrix during manufacturing, pre-establishing chemical properties that will maintain adhesion strength throughout the service life under extreme weather conditions
Solution Approach 2:
The patent uses the polyether polyol-based resin matrix as a buffer layer that absorbs environmental stress and maintains bonding between the fluorocarbon coating and the reinforcement materials throughout the service life
3Ease of manufacture
If conventional polyurethane resin matrices are used, then processing is simplified, but flame retardance and coating affinity deteriorate
Solution Approach 1:
The patent combines multiple functions into the polyurethane resin matrix itself: the polyether polyols provide both flame retardance and improved coating affinity, eliminating the need for separate treatment steps
Solution Approach 2:
The patent designs the polyether polyol-based resin matrix to simultaneously provide structural performance, flame retardance, and enhanced coating adhesion, making the material universally suitable for outdoor applications
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 provides a polyurethane pultrusion article with superior weatherability and favorable flame retardance, ensuring strong adhesion between the coating and the composite, preventing peeling and maintaining material integrity under outdoor conditions.
Implementation Method 1
a polyurethane composition comprising: A) an isocyanate component comprising one or more polyisocyanates; B) an isocyanate-reactive component comprising: b1) a first polyether polyol having a functionality of 2-3 and a hydroxyl number of 10-120 mgKOH/g
Implementation Method 2
a coating layer applied thereon, wherein the coating layer and the polyurethane pultrusion composite have good affinity to each other
Data Source
AI summary
The invention provides a polyurethane pultrusion article comprising a polyurethane pultrusion composite and a coating layer applied thereon, wherein the polyurethane pultrusion composite comprises a polyurethane resin matrix and a reinforcement material, and is prepared by a polyurethane pultrusion process, wherein the polyurethane resin matrix is prepared from a polyurethane composition comprising: A) an isocyanate component comprising one or more polyisocyanates; B) an isocyanate-reactive component comprising: b1) a first polyether polyol having a functionality of 2-3 and a hydroxyl number of 10-120 mgKOH/g; b2) a second polyether polyol having a functionality of 3-8 and a hydroxyl number of 810-1900 mgKOH/g; b4) one or more isocyanate-reactive flame retardants. The polyurethane pultrusion article provided by the invention has both favorable flame retardance and good adhesion between the coating layer and the composite.