Polyether Thiol Curing Agents for Low-Temperature Epoxy Adhesives
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Solution Overview
Problem
Epoxy adhesives using polyether skeleton-based polymercaptan curing agents cure slowly at low temperatures, making them ineffective in cold environments.
Innovation Solution
A polymer composition containing a polyether polymer with a thiol group and a cationic surfactant, which accelerates curing even at low temperatures, comprising a polyether moiety in the main chain and a structural unit at the terminal, with a thiol group content of 8 mass % or more, and a cationic surfactant content of 0.01 to 5.0 mass %.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a polyether skeleton-based polymercaptan curing agent is used for epoxy adhesive, then fast curability at normal temperature is achieved, but curing rate becomes slow at low temperature (15°C or lower)
Solution Approach 1:
The patent combines a polyether polymer having a thiol group with a cationic surfactant to create a composite curing agent system. The polyether polymer provides the base curing functionality while the cationic surfactant component enhances low-temperature reactivity, achieving synergistic effect that resolves the contradiction between normal-temperature speed and low-temperature performance.
Solution Approach 2:
The patent modifies the chemical structure parameters of the curing agent by introducing a polyether polymer with specific thiol group content (8 mass% or more) and terminal structural units, combined with cationic surfactant. These parameter changes enable the curing agent to maintain high reactivity across a wider temperature range, particularly improving low-temperature curing rate.
2Productivity
If a polyether skeleton-based polymercaptan curing agent is used, then fast curability is achieved, but the adhesive has limited effectiveness in cold environments
Solution Approach 1:
The curing agent is formulated as a composite system combining polyether polymer with thiol groups and cationic surfactant. This composite structure provides both fast curing capability and environmental adaptability, allowing the adhesive to function effectively across varying temperature conditions including cold environments.
Solution Approach 2:
The polyether polymer-based curing agent with thiol groups and cationic surfactant serves multiple functions: it provides fast curability through thiol-epoxy reaction, maintains low viscosity for good processability, ensures stability during storage, and delivers effective adhesion in diverse environmental conditions including low temperatures.
3Loss of time
If conventional polymercaptan curing agents are used, then fast curing occurs at room temperature, but viscosity control and stability are compromised
Solution Approach 1:
The patent optimizes the molecular structure parameters of the polyether polymer, specifically controlling the thiol group content at 8 mass% or more and incorporating specific terminal structural units. These parameter optimizations achieve fast curing kinetics while maintaining composition stability and low viscosity, resolving the contradiction between curing speed and stability.
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 polymer composition achieves fast curing at low temperatures with low viscosity and good stability, ensuring effective adhesion even in cold conditions.
Implementation Method 1
a polymer composition containing a polyether polymer having a thiol group... and a cationic surfactant... accelerates curing even at low temperatures
Implementation Method 2
a compound having a polyether skeleton in the main chain and three or more thiol groups in one molecule... causing a thiol group and an epoxy group to rapidly react
Data Source
AI summary
A polymer composition contains a polyether polymer having a thiol group, in which the polyether polymer having a thiol group has a polyether moiety represented by Formula (1) in a main chain and a structural unit represented by Formula (2) at a terminal, a thiol group content in the polyether polymer containing a thiol group is 8 wt/mass % or more, and the polymer composition further contains a cationic surfactantwhere R1 is a residue obtained by removing a hydrogen atom from a polyvalent amine or polyhydric alcohol having 10 or less carbon atoms, R2 is an alkylene group having 2 to 6 carbon atoms, n is 1 to 200, and m is 2 to 8.