Modified Urea-Formaldehyde Binder for Glass Fiber Roofing Mats
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Solution Overview
Problem
Conventional urea-formaldehyde resin-based binder formulations for glass fiber mats are prone to uneven application, leading to non-uniform mat properties, especially when using the falling film curtain coater technique, and can become brittle, deteriorating strength when exposed to wet conditions.
Innovation Solution
Modifying the thermosetting urea-formaldehyde resin with a thickener to control its viscosity and surface tension, resulting in a binder formulation that can be applied evenly at high manufacturing speeds using a curtain coater, with improved tensile and tear strength properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional urea-formaldehyde resin-based binder formulation is used, then the binder can be applied to glass fiber mats, but the application is uneven leading to non-uniform mat properties
Solution Approach 1:
The patent modifies the urea-formaldehyde resin by changing its chemical composition parameters - specifically adding 0.1-5.0 parts per hundred resin (phr) of a polymeric thickener and 0.1-5.0 phr of a surfactant. This parameter change adjusts the binder formulation's viscosity and surface tension, enabling even application at high manufacturing speeds while producing uniform mat properties with consistent tensile and tear strength.
2Productivity
If higher manufacturing speeds are used, then productivity increases, but binder application becomes even more uneven
Solution Approach 1:
The modified UF resin formulation with polymeric thickener and surfactant maintains optimal viscosity and surface tension characteristics that enable even binder application even at high manufacturing speeds. The thickener provides shear-thinning behavior that allows the binder to flow uniformly during high-speed curtain coating while the surfactant ensures consistent wetting and distribution across the glass fiber mat surface.
3Reliability
If conventional UF resin binder is used, then the mat has basic binding properties, but the mat becomes brittle and strength deteriorates when exposed to wet conditions
Solution Approach 1:
The patent creates a composite binder system by combining modified urea-formaldehyde resin with polymeric thickener and surfactant. This composite formulation maintains the cross-linking and binding properties of UF resin while the polymeric thickener contributes flexibility and toughness. The resulting mat exhibits improved reliability with retained strength and reduced brittleness even when exposed to wet conditions.
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 modified binder formulation ensures uniform structural properties and enhanced processing characteristics, achieving even application and increased strength in glass fiber mats, particularly suitable for roofing shingles.
Implementation Method 1
modifying a thermosetting urea-formaldehyde (UF) resin composition with a thickener to increase its viscosity
Implementation Method 2
curing (polymerizing) the UF based resin binder which bonds the fibers together in the mat
Implementation Method 3
modifying the thermosetting urea-formaldehyde resin with a thickener to control its viscosity and surface tension
Data Source
AI summary
Provided is thermosetting urea-formaldehyde (UF) resin binder formulation modified with a thickener. The formulation preferably has a viscosity in the range of from 3 to 10 cP and a surface tension of from 35 to 50 mN/m, and is preferably prepared from a binder composition exhibiting a viscosity of from 175 to 250 cP.