Polyurea Polyurethane Golf Ball Cover Manufacturing
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Solution Overview
Problem
Conventional prepolymer manufacturing processes for polyurea and polyurethane compositions face challenges such as high concentrations of free isocyanate, compatibility issues with different isocyanate and polyamine compounds, and health and safety risks, particularly with compounds like toluene diisocyanate, which hinder the use of various combinations and impact the properties of the final polymer products.
Innovation Solution
A novel method involving the preparation of amine-terminated and hydroxyl-terminated prepolymers by reacting isocyanate compounds with stoichiometric excesses of polyamines and polyols, followed by reactions with additional isocyanate compounds to form isocyanate-terminated prepolymers, which are then extended with chain extenders to produce polyurea and polyurethane compositions with desirable properties like high tensile strength and impact durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional prepolymer manufacturing processes use stoichiometric excess of isocyanate to polyamine, then the reaction proceeds efficiently, but high concentrations of free isocyanate remain causing health and safety risks
Solution Approach 1:
The patent segments the conventional single-step reaction into multiple sequential steps: first forming a prepolymer with polyol and isocyanate, then reacting the prepolymer with polyamine. This segmentation allows better control of stoichiometry at each stage, reducing residual free isocyanate while maintaining reaction efficiency.
Solution Approach 2:
The patent performs preliminary action by pre-forming the polyol-isocyanate prepolymer before adding the polyamine. This preliminary step establishes a controlled ratio of functional groups that prevents excessive free isocyanate formation during the final polymerization, thereby reducing health and safety risks.
2Adaptability or versatility
If diverse combinations of isocyanate and polyamine compounds are used, then polymer composition versatility is improved, but compatibility issues arise affecting final product properties
Solution Approach 1:
The polyol acts as an intermediary component that mediates between different isocyanate and polyamine compounds. By forming a prepolymer with the polyol first, the system creates a more compatible intermediate structure that reduces direct incompatibility issues between diverse isocyanate and polyamine combinations, allowing greater versatility while maintaining reliability.
3Manufacturing precision
If stoichiometric excess of isocyanate is used in the reaction, then complete reaction with polyamine is achieved, but residual isocyanate groups remain in the final polymer
Solution Approach 1:
The patent segments the reaction to first consume isocyanate with polyol in a controlled ratio to form prepolymer, then add polyamine to complete the polymerization. This segmentation ensures more complete reaction at each stage with better stoichiometric control, minimizing residual isocyanate groups in the final polymer while maintaining manufacturing precision.
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
This method allows for the production of polyurea and polyurethane compositions with enhanced properties, such as high tensile strength, flex modulus, and impact durability, while minimizing residual isocyanate groups and improving handling safety, enabling the use of diverse isocyanate and polyamine combinations.
Implementation Method 1
Polyurethanes are produced by the reaction of a multi-functional isocyanate with a polyol in the presence of a catalyst and other additives. Polyurea compositions contain urea linkages formed by reacting an isocyanate group (—N═C═O) with an amine group (—NH or —NH2).
Data Source
AI summary
Methods for making golf balls having a cover made from polyurea and polyurethane compositions are provided. The methods for making the polyurea and polyurethane composition involve preparing an amine-terminated or hydroxyl-terminated first prepolymer by reacting a first isocyanate compound with a stoichiometric excess of polyamine or polyol (depending on the type of prepolymer desired). The first prepolymer is then reacted with a stoichiometric excess of a second isocyanate compound to form an isocyanate-terminated second prepolymer. The second prepolymer is then reacted with a chain extender.