UF Binder Viscosity Control for Uniform Roofing Mat Coating

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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 suffer from brittleness and reduced strength when exposed to wet conditions.

Innovation Solution

Modifying the thermosetting urea-formaldehyde resin with a thickener to control viscosity and surface tension, resulting in a binder formulation with specific rheological characteristics that allows for even application at high manufacturing speeds, using a range of 175 to 250 cP viscosity and 35 to 50 mN/m surface tension, thereby improving processing and structural uniformity of the mats.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional urea-formaldehyde resin-based binder formulations are used, then the binder provides basic binding function, but the application becomes uneven leading to non-uniform mat properties

Engineering Contradiction:
Improvebinder application uniformityVSAvoidmat property consistency
Core Design Contradiction:
Manufacturing precisionVSReliability

Solution Approach 1:

The patent modifies the binder formulation by changing physical parameters (viscosity and surface tension) of the urea-formaldehyde resin. Specifically, the viscosity is adjusted to 5-50 cP and surface tension to 20-40 mN/m, which enables even application across the mat surface and ensures uniform mat properties throughout.

Inventive Principle:
Principle #35Parameter changes

2Productivity

If the binder formulation is applied at high manufacturing speeds, then productivity increases, but application uniformity deteriorates

Engineering Contradiction:
Improvemanufacturing speedVSAvoidbinder application uniformity
Core Design Contradiction:
ProductivityVSManufacturing precision

Solution Approach 1:

By optimizing the viscosity to 5-50 cP and surface tension to 20-40 mN/m, the binder formulation maintains application uniformity even at high manufacturing speeds. The modified rheological properties allow the binder to flow and distribute evenly despite the reduced residence time at high speeds.

Inventive Principle:
Principle #35Parameter changes

3Strength

If UF resin is used as binder, then cost is reduced and binding function is provided, but the mat becomes brittle and strength deteriorates in wet conditions

Engineering Contradiction:
Improvetensile and tear strengthVSAvoidbrittleness and wet condition sensitivity
Core Design Contradiction:
StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent creates a composite binder system by combining urea-formaldehyde resin with auxiliary agents that modify its properties. This composite formulation maintains the cost-effectiveness and binding function of UF resin while adding flexibility and resistance to wet conditions, eliminating brittleness.

Inventive Principle:
Principle #40Composite materials

4Manufacturing precision

If the binder viscosity is increased to improve application control, then application precision improves, but the processing speed decreases

Engineering Contradiction:
Improveapplication controlVSAvoidprocessing speed
Core Design Contradiction:
Manufacturing precisionVSProductivity

Solution Approach 1:

The patent optimizes viscosity to a specific range of 5-50 cP, which provides sufficient application control and uniform distribution while maintaining low enough flow characteristics to enable high processing speeds. This optimized viscosity range resolves the contradiction between application precision and productivity.

Inventive Principle:
Principle #35Parameter changes

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 tensile and tear strength properties in both machine and cross-machine directions, enhancing the structural integrity and processing efficiency of glass fiber mats, particularly in roofing applications.

Implementation Method 1

modifying the thermosetting urea-formaldehyde resin composition with a thickener to control viscosity, which resin composition is then used to produce an adhesive binder formulation... the binder formulation is controlled to exhibit a particular viscosity in the range of from 3 to 10 cP

Methodology Applied
Scientific EffectViscosity control:

Implementation Method 2

the binder formulation is controlled to exhibit a surface tension of from 35 to 50 mN/m

Methodology Applied
Scientific EffectSurface tension control: Surface Tension

Implementation Method 3

modifying the thermosetting urea-formaldehyde resin composition with a thickener to control viscosity

Methodology Applied
Scientific EffectThickening:

Implementation Method 4

the binder formulation... can be applied evenly to a nonwoven fiber mat using a falling film curtain coater

Methodology Applied
Scientific EffectCurtain coating:

Implementation Method 5

curing (polymerizing) the UF based resin binder which bonds the fibers together in the mat

Methodology Applied
Scientific EffectPolymerization: Photopolymerisation

Implementation Method 6

In the drying and curing oven the mat is subjected to temperatures of 250-450 or 500 degrees F.

Methodology Applied
Scientific EffectThermal curing: Heating

Data Source

PatentUS20080160258A1Roofing mat using urea-formaldehyde binder of particular viscosity and surface tension
Publication Date: 2008.07.03 JOHNS MANVILLE CORP

AI summary

Provided is thermosetting urea-formaldehyde (UF) resin binder formulation, preferably prepared with modified styrene-maleic anhydride. The formulation 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 prepared using a UF resin composition exhibiting a viscosity of from 175 to 250 cP.