Polymer Emulsion Preservation Stability and Low-Temperature Curing
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Solution Overview
Problem
Existing polymer emulsions and thermosetting resin compositions face challenges in preservation stability and low-temperature curability, with issues such as phase separation and the need for high temperatures for curing.
Innovation Solution
A polymer emulsion containing a specific constituent unit represented by formula (1), with a content ratio between 0.5 mol % and 40 mol %, and a two-component thermosetting resin composition combining this polymer emulsion with an acrylic polyol polymer emulsion, allowing for excellent preservation stability and low-temperature curability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a polymer emulsion containing blocked isocyanate is prepared for low-temperature curing, then curability at low temperature is improved, but preservation stability deteriorates due to phase separation and reaction with water
Solution Approach 1:
The patent introduces a specific polymer structure as an intermediary component that mediates between the blocked isocyanate's low-temperature reactivity and its stability requirements. The polymer contains a hydroxyl group-containing constituent unit (A-1) with specific structural features (formula 1) that enable controlled interaction with the blocked isocyanate, allowing low-temperature curing while maintaining preservation stability through proper molecular design rather than direct mixing of incompatible components.
Solution Approach 2:
The patent applies parameter changes by precisely controlling the content ratio of constituent unit (A-1) within 5-40 mol% and adjusting the glass transition temperature to 0-110°C. These parameter optimizations balance the reactivity and stability characteristics, enabling the polymer emulsion to cure at low temperatures while maintaining adequate preservation stability during storage.
2Speed
If the content of hydroxyl group-containing constituent unit is increased to improve low-temperature curability, then reaction activity is improved, but preservation stability deteriorates due to increased reaction with water
Solution Approach 1:
The patent optimizes the content ratio parameter of hydroxyl group-containing constituent unit (A-1) to a specific range of 5-40 mol%. This parameter control ensures sufficient reaction activity for low-temperature curing while limiting the amount of hydroxyl groups that could react with water during storage, thereby maintaining preservation stability.
Solution Approach 2:
The patent introduces local quality by designing specific structural features within the polymer chain (formula 1 with specific R1, R2, R3, R4, and n values) that create localized regions with different reactivity characteristics. This structural differentiation allows certain portions to be more reactive for curing while other portions maintain stability during storage.
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 proposed solution achieves excellent preservation stability of the polymer emulsion and enables effective low-temperature curing of the thermosetting resin composition, improving storage stability and processing conditions.
Implementation Method 1
a polymer emulsion comprising a polymer containing a constituent unit having a blocked isocyanato group and a constituent unit having a hydroxyl group
Data Source
AI summary
The purpose of the present invention is to provide a polymer emulsion having excellent preservation stability, a thermosetting resin composition containing the polymer emulsion, and having excellent curability at low temperature, a coating material containing the thermosetting resin composition, a resin cured film obtained by curing the thermosetting resin composition, a coating film including the resin cured film, and a method for storing the polymer emulsion. The present invention includes an invention of a polymer emulsion (B) including a polymer (A) containing a constituent unit (A-1), and water, wherein a content ratio of the constituent unit (A-1) when a total content of all constituent units of the polymer (A) is defined as 100 mol % is 0.5 mol % or more and 40 mol % or less.