Formaldehyde Free Fabric Coating
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Solution Overview
Problem
The hazards associated with Resorcinol-Formaldehyde (RF) adhesives used for bonding rubber to fabric necessitate the development of a formaldehyde-free alternative that maintains desirable adhesion properties.
Innovation Solution
A composition comprising styrene butadiene latex, blocked isocyanate, styrene butadiene vinylpyridine terpolymer, and water, with optional additives like surfactants and thickeners, is used to create a formaldehyde-free adhesive with a specific ratio and pH range, applied through a two-stage mixing process and heat-treatment to achieve effective bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If Resorcinol-Formaldehyde (RF) adhesive is used for bonding rubber to fabric, then adhesion strength is improved, but health hazards and environmental risks worsen
Solution Approach 1:
The patent extracts and removes the harmful formaldehyde component from the adhesive system while retaining the essential bonding functionality through a combination of blocked isocyanate and styrene butadiene vinylpyridine terpolymer, thereby eliminating health hazards while maintaining adhesion strength
Solution Approach 2:
The patent changes the chemical composition parameters by substituting the RF adhesive system with a new formulation using blocked isocyanate and styrene butadiene vinylpyridine terpolymer in specific ratios, transforming the adhesive chemistry to eliminate harmful formaldehyde while preserving bonding performance
2Object-affected harmful factors
If formaldehyde-free adhesive composition is developed, then health safety is improved, but adhesion performance may worsen
Solution Approach 1:
The patent creates a composite adhesive system combining blocked isocyanate and styrene butadiene vinylpyridine terpolymer with specific physical and chemical properties that complement each other, achieving both formaldehyde-free formulation and high adhesion performance through material composition synergy
Solution Approach 2:
The patent optimizes specific parameter ranges including blocked isocyanate content (1.46-18.20 wt%), styrene butadiene vinylpyridine terpolymer content (13.81-54.83 wt%), pH (8.0-10.0), and viscosity (20-500 cP) to simultaneously achieve formaldehyde-free status and high adhesion performance
3Object-affected harmful factors
If new adhesive formulation is created, then environmental safety is improved, but manufacturing complexity worsens
Solution Approach 1:
The patent establishes specific parameter ranges for each component (blocked isocyanate, styrene butadiene vinylpyridine terpolymer, water, and optional additives) that simplify the formulation process by providing clear guidance for achieving consistent, safe, and effective adhesive performance without excessive complexity
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 high-strength, formaldehyde-free adhesive that maintains adhesion comparable to traditional RFL, suitable for severe conditions, such as in conveyor belts, while minimizing environmental and health risks.
Implementation Method 1
a blocked isocyanate from 1.46 wt % to 18.20 wt %, preferably from 2.88 wt % to 15.11 wt %, more preferably 4.26 wt % to 8.17 wt %; based on the total weight of the composition
Implementation Method 2
The compositions, methods, and articles described herein overcome the above-mentioned environmental and health issues while maintaining desirable adhesion properties
Data Source
AI summary
An adhesive composition and method of making the adhesive composition. The adhesive composition is a formaldehyde-free and aqueous composition includes at least a styrene butadiene latex, a blocked isocyanate, and a styrene butadiene vinylpyridine terpolymer. The adhesive composition can be utilized in a method for coating textiles for subsequent bonding to rubber.