Road Marking Epoxy Composition for Pump Seal Gelation Control
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Solution Overview
Problem
Conventional two-part epoxy compositions used for substrate marking often cause pump failure due to gelation and overheating, leading to downtime for maintenance and seal replacement.
Innovation Solution
Incorporating a latent cure catalyst, such as toluene sulfonate ester, in the epoxy composition to reduce pump failure while maintaining fast curing times, replacing or reducing the use of multifunctional (meth)acrylates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional two-part epoxy compositions are used for substrate marking, then fast curing times are achieved, but pump failure occurs due to gelation and overheating
Solution Approach 1:
The patent changes the chemical parameters of the epoxy composition by incorporating specific catalysts (such as dibutyl tin oxide, dibutyl phthalate, or a combination thereof) and controlling the ratio of epoxide to amine components. This modifies the curing chemistry to prevent gelation during pumping while maintaining fast curing performance, thereby improving pump reliability and reducing downtime.
Solution Approach 2:
The patent introduces intermediary substances (catalysts and plasticizers) that mediate between the epoxide and amine components. These intermediaries control the curing reaction rate, preventing premature gelation during pump operation while ensuring fast curing after application. The catalysts act as mediators that accelerate curing without causing pump seal gelation.
2Reliability
If multifunctional (meth)acrylates are used as dry time accelerators, then fast curing is achieved, but pump seals gel and pump failure occurs
Solution Approach 1:
The patent changes the chemical composition parameters by replacing multifunctional (meth)acrylates with alternative catalyst systems (dibutyl tin oxide, dibutyl phthalate) and adjusting the epoxide-to-amine ratio. This maintains fast curing performance while eliminating the gelation problem on pump seals, thereby improving both reliability and productivity.
Solution Approach 2:
The patent extracts and removes the problematic multifunctional (meth)acrylate component from the formulation while retaining the fast curing functionality through alternative catalysts. This extraction eliminates the harmful gelation effect on pump seals while preserving the desired application efficiency.
3Duration of action of moving object
If epoxy composition is formulated for fast curing, then No-Pick-Up Time is reduced, but pump operating time is limited
Solution Approach 1:
The patent introduces dynamic control of the curing reaction through temperature-dependent catalyst activity. The formulation maintains slow reaction rate during pumping (lower temperature) and accelerates curing after application (higher temperature). This dynamic behavior allows extended pump operation time while achieving fast curing performance when needed.
Solution Approach 2:
The patent performs preliminary preparation of the epoxy and amine components with stabilizers and controlled catalysts that prevent premature reaction during storage and pumping. The curing reaction is activated or accelerated after application, allowing extended pump operation time while maintaining fast curing when the composition is applied to the substrate.
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 epoxy compositions achieve fast curing times with reduced pump failure, ensuring continuous operation and efficient application without overheating, as demonstrated by the Harsh Pump Test.
Implementation Method 1
a latent cure catalyst. In some cases, the latent cure catalyst comprises at least one toluene sulfonate ester
Implementation Method 2
Conventional two-part epoxy compositions for marking of substrate surfaces may gel and coat pump seals
Data Source
AI summary
This disclosure relates to epoxy compositions and more particularly to two-part epoxy compositions that are useful for marking substrates, such as roadway and airport runway surfaces. The compositions and methods described herein can reduce build-up on applicator pump seals. Such build-up can lead to pump failure. In some cases, the compositions can reduce down-time due to pump failure. However, the compositions retain the necessary properties for substrate marking, such as curing within a short period of time.