Room Temperature Curing Adhesive with High Temperature Strength
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Solution Overview
Problem
Current room temperature curing adhesive compositions fail to achieve high strength and heat aging properties, which are essential for maintaining structural integrity under varying temperatures.
Innovation Solution
A room temperature curing adhesive composition comprising a polyurethane oligomer with (meth)acrylate functionality, cycloalkyl(meth)acrylate, maleimide-functionalized compounds, and a free-radical initiator, which are combined in specific weight percentages to enhance high temperature properties without compromising initial tensile strength or fixture time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional room temperature curing adhesive compositions are used, then rapid fixture time is achieved, but high temperature strength and heat aging resistance are insufficient
Solution Approach 1:
The patent employs a composite adhesive system combining polyurethane (meth)acrylate oligomer with cycloalkyl(meth)acrylate and maleimide-functionalized compound. This composite formulation integrates the rapid curing characteristics of (meth)acrylate with the high temperature stability of cycloalkyl and maleimide structures, achieving both rapid fixture and superior heat resistance simultaneously
Solution Approach 2:
The patent modifies the chemical composition parameters by incorporating specific ratios of cycloalkyl(meth)acrylate (10-50 wt%) and maleimide-functionalized compound (5-30 wt%) into the adhesive system. These parameter changes transform the thermal properties of the adhesive, enabling it to maintain structural integrity at elevated temperatures while preserving room temperature curing capability
2Productivity
If polyurethane (meth)acrylate oligomer is used as base adhesive, then rapid RT curing is achieved, but high temperature properties are compromised
Solution Approach 1:
The patent merges two distinct chemical systems: the rapid-curing polyurethane (meth)acrylate oligomer and the heat-resistant cycloalkyl(meth)acrylate with maleimide groups. This combination allows the adhesive to exhibit dual characteristics - rapid fixture kinetics from the (meth)acrylate component and enhanced hot strength from the cycloalkyl-maleimide structure
3Reliability
If adhesive composition is optimized for high temperature resistance, then heat aging strength improves, but initial tensile strength may be compromised
Solution Approach 1:
The patent applies local quality by assigning different functional roles to different molecular components within the adhesive system. The polyurethane (meth)acrylate oligomer provides initial bonding strength and rapid curing, while the cycloalkyl(meth)acrylate and maleimide-functionalized compound provide heat aging resistance. Each component optimizes local performance without compromising overall system balance
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 exhibits significant increases in high temperature strength and heat aging resistance, maintaining initial tensile strength and rapid fixture times, making it suitable for bonding various substrates including metals and non-metals.
Implementation Method 1
a cure system comprising at least one peroxide
Data Source
AI summary
Room temperature curing structural adhesive compositions including polyurethane oligomers having multi-methacrylate functionality, cycloalkylmethacrylate, at least one maleimide-functionalized compound and a cure system are disclosed. These compositions exhibit enhanced high temperature properties, including hot strength, heat/humidity strength, and heat aging strength, without compromising initial tensile strength and fixture speeds and still possessing a room temperature cure.