Crosslinkable Coating Composition with High Hydroxyl Polycarbamates
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Solution Overview
Problem
Current alkyd-based coating formulations exhibit slow hardness development, long dry times, and slow curing rates under ambient conditions, necessitating an improvement in crosslinkable coating compositions for faster curing and enhanced performance.
Innovation Solution
A crosslinkable coating composition comprising polycarbamates derived from polyesters with high hydroxyl groups, crosslinking agents, acid catalysts, and optional organic solvents, which are combined and processed to produce a composition that cures efficiently at low temperatures, avoiding the use of isocyanates and formaldehyde.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional alkyd-based coating formulations are used, then the coating provides basic protective function, but the hardness development is slow and dry time is long under ambient conditions
Solution Approach 1:
The patent changes the chemical parameters of the coating formulation by using polycarbamates with high hydroxyl group content (at least 25% by weight of units having 4 or more hydroxyl groups) and specific crosslinking agents, which fundamentally alters the curing mechanism to achieve faster hardness development and shorter dry times under ambient conditions
Solution Approach 2:
The patent creates a composite coating system combining polycarbamates derived from polyesters with high hydroxyl group content, crosslinking agents, and acid catalysts, where the synergistic interaction between these components enables rapid crosslinking and hardness development without requiring high temperatures or long periods
2Productivity
If conventional alkyd-based coating formulations are used, then the formulation is simple and easy to manufacture, but the curing rate is slow under ambient conditions
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating polycarbamates with at least 25% by weight of units having 4 or more hydroxyl groups, which fundamentally changes the reactivity and curing kinetics of the system, enabling high curing rates under ambient conditions
Solution Approach 2:
The patent introduces acid catalysts as intermediaries to accelerate the crosslinking reaction between polycarbamates and crosslinking agents, significantly boosting the curing rate without requiring complex processing equipment or high temperatures
3Temperature
If low temperature curing is achieved, then energy consumption is reduced and ambient application is enabled, but hardness development and curing rate are typically slower
Solution Approach 1:
The patent develops a composite coating system where polycarbamates with high hydroxyl group content react with crosslinking agents in the presence of acid catalysts, creating a highly reactive system that maintains fast curing rates even at low temperatures (60°C or less, including room temperature
Solution Approach 2:
The patent changes the chemical reactivity parameters by using polycarbamates containing at least 25% by weight of units with 4 or more hydroxyl groups, which provides sufficient reaction activity to achieve high curing rates at low temperatures without requiring thermal activation
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 resulting coating composition demonstrates improved hardness development, reduced dry time, and increased curing rates under ambient conditions, with high crosslinking density and enhanced properties such as water resistance and adhesion, even when cured at room temperature.
Implementation Method 1
one or more acid catalysts
Implementation Method 2
one or more polycarbamates derived from one or more polyesters comprising the condensation reaction product of one or more polyols with one or more polyacids
Data Source
AI summary
The instant invention provides a crosslinkable coating composition, and method of producing the same. The crosslinkable coating composition according to the present invention comprises: (a) one or more polycarbamates derived from one or more polyesters comprising the condensation reaction product of one or more polyols with one or more polyacids, wherein said one or more polyols comprise at least 25 percent by weight of one or more units having 4 or more hydroxyl groups; (b) one or more crosslinking agents; (c) one or more acid catalysts; and (d) optionally one or more organic solvents.