Blocked Polyisocyanate Composition for Low-Temperature Curing
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Solution Overview
Problem
Existing blocked polyisocyanate compositions require high curing temperatures, exceeding 100°C, which is inefficient and costly, and current catalysts like 1-methyl-3-n-octylimidazolium-2-N-phenylamidate do not provide satisfactory low-temperature curing properties.
Innovation Solution
A blocked polyisocyanate composition comprising a blocked polyisocyanate compound and an amidate compound represented by Formula (2), which includes specific hydrocarbon groups and ring structures, allowing for low-temperature curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional catalysts like 1-methyl-3-n-octylimidazolium-2-N-phenylamidate are used, then the blocked polyisocyanate composition can be cured, but the curing temperature must exceed 100°C which increases energy costs and reduces processing efficiency
Solution Approach 1:
The invention changes the chemical structure parameters of the catalyst by introducing specific amidate compounds with particular hydrocarbon groups (C1-C20) and ring structures. This structural parameter change enables the catalyst to function effectively at lower temperatures (below 100°C) while maintaining acceptable curing efficiency, thus resolving the contradiction between low curing temperature and high productivity
2Reliability
If high curing temperatures exceeding 100°C are used, then satisfactory curing properties are achieved, but energy costs increase and processing becomes less efficient
Solution Approach 1:
The invention modifies the catalyst's chemical parameters by using amidate compounds with specific hydrocarbon chain lengths (C1-C20) and ring structures, which changes the activation energy and reaction kinetics. This allows the curing process to proceed reliably at lower temperatures (below 100°C), thereby reducing energy consumption while maintaining satisfactory curing properties
Solution Approach 2:
The invention creates a composite catalytic system by combining the amidate compound with specific structural features (hydrocarbon groups and ring structures). This composite structure enhances the catalyst's ability to promote low-temperature curing reactions, achieving both reliable curing properties and reduced energy costs
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 composition achieves excellent low-temperature curing properties, enabling curing at temperatures below 100°C, reducing energy costs and improving processing efficiency.
Implementation Method 1
A catalyst is sometimes added to lower the curing temperature. Commonly known compounds for use as a catalyst include tin compounds, such as dibutyltin dilaurate (hereinafter referred to as 'DBTDL'). Known blocking agent dissociation catalysts include 1-methyl-3-n-octylimidazolium-2-N-phenylamidate
Implementation Method 2
Blocked polyisocyanate compounds are inactive at ordinary temperatures with the isocyanate group of the polyisocyanate being blocked by a blocking agent; however, heating causes dissociation of the blocking agent to regenerate the isocyanate group
Data Source
AI summary
The present invention provides a blocked polyisocyanate composition comprising a blocked polyisocyanate compound and an amidate compound represented by the following Formula (2):wherein B, R4, R5, R6, R7, R8, R9, R10, and R11 are as defined in the specification.