Dual Catalyst Cure Profile Control for Cast Elastomers
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Solution Overview
Problem
The existing methods for casting golf ball covers lack control over material property development during manufacturing, particularly in manipulating the cure profile of the cover layer, which can lead to uneven dimple structures and reduced production efficiency.
Innovation Solution
A method involving a formulation comprising an isocyanate prepolymer, a curative, a first catalyst, and a second catalyst is used to manipulate the cure profile of the golf ball cover. The first catalyst initiates a front-end cure reaction, while the second catalyst slows down the back-end cure reaction, allowing for greater control over the material properties and extended processing time without affecting the front-end cure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single catalyst system is used for curing the cover layer, then the curing process is simple, but the control over material property development is poor leading to uneven dimple structures and reduced production efficiency
Solution Approach 1:
The curing process is segmented into two distinct phases using two different catalysts: a first catalyst (organic acid) for front-end cure and a second catalyst (metal-based) for back-end cure. This segmentation allows independent control of each curing stage, enabling precise manipulation of material properties at different processing steps without requiring complex equipment modifications.
2Productivity
If the cover layer cures quickly, then production cycle time is reduced, but subsequent processing steps such as paint application and dimple formation become difficult
Solution Approach 1:
The first catalyst initiates front-end cure to provide initial green strength and basic structural integrity within a controlled timeframe, allowing the cover to support subsequent processing steps. The second catalyst then completes the back-end cure to achieve final material properties, ensuring both processing ease and production efficiency are optimized.
3Ease of manufacture
If the cover layer remains uncured for extended processing time, then subsequent steps can be performed easily, but production efficiency decreases and the material may become unusable
Solution Approach 1:
The dual catalyst system creates a dynamic curing profile where the first catalyst provides initial reactivity for quick green strength development, then the second catalyst maintains controlled reactivity for an extended processing window. This dynamic approach allows easy manipulation during processing while ensuring complete cure within a reasonable production timeframe, optimizing both ease of manufacture and productivity.
4Manufacturing precision
If standard curing conditions are used, then the process is straightforward, but paint application and other surface treatments result in uneven coverage and defects
Solution Approach 1:
The first organic acid catalyst (e.g., acetic acid, oleic acid) provides controlled front-end curing that maintains surface characteristics optimal for paint reception and surface treatments. The second metal-based catalyst (e.g., stannous octoate, zinc octoate) then completes the cure to achieve final mechanical properties. This local quality approach ensures surface quality for painting while maintaining overall structural integrity.
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 enables precise control over the material properties of the golf ball cover, allowing for improved mechanical properties and extended processing windows, which enhances manufacturing efficiency and reduces defects such as uneven paint application and dimple structures.
Implementation Method 1
initiating a front-end cure reaction between the isocyanate prepolymer and the curative with the first catalyst
Implementation Method 2
cure reaction between the isocyanate prepolymer and the curative
Implementation Method 3
decreasing a rate of a back-end cure reaction between the isocyanate prepolymer and the curative using the second catalyst
Implementation Method 4
back-end cure reaction between the isocyanate prepolymer and the curative
Data Source
AI summary
A method for manipulating a cure profile of an elastomer is disclosed. The method may include providing a formulation comprising an isocyanate prepolymer, a curative, a first catalyst, and a second catalyst. The method may further include curing the formulation by initiating a front-end cure reaction between the isocyanate prepolymer and the curative with the first catalyst. The method may further include decreasing a rate of a back-end cure reaction between the isocyanate prepolymer and the curative using the second catalyst, wherein the second catalyst does not impact the front-end cure reaction.