Polyurethane Adhesive Silane Carbodiimide Heat Resistance
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Solution Overview
Problem
Existing polyurethane adhesives for industrial lamination lack sufficient heat resistance, which is crucial for maintaining bond strength at high temperatures.
Innovation Solution
A polyurethane adhesive containing 0.0001 to 0.1 mole of silane groups per 100 g of polyurethane, combined with carbodiimide groups, is developed to enhance heat resistance. The silane groups are incorporated through a silane compound with reactive groups such as isocyanate or amino groups, and the carbodiimide groups are formed from isocyanate groups with elimination of carbon dioxide, ensuring strong bonding and crosslinking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polyurethane adhesive is used for technical lamination, then bonding capability is achieved, but heat resistance is insufficient
Solution Approach 1:
The patent creates a composite adhesive system by combining polyurethane with silane groups and carbodiimide groups. The silane groups (containing hydroxyl or alkoxy groups) and carbodiimide groups work synergistically to form a crosslinked network structure that maintains bond strength at high temperatures, resolving the contradiction between achieving bonding capability and improving heat resistance.
Solution Approach 2:
The patent modifies the chemical composition parameters of the polyurethane adhesive by incorporating specific amounts of silane groups (0.0001 to 0.1 mol per 100 g polyurethane) and carbodiimide groups. This parameter change transforms the adhesive from a standard polyurethane formulation to one with enhanced thermal stability and bond strength retention at elevated temperatures.
2Temperature
If silane groups are added to polyurethane, then heat resistance is improved, but formulation complexity increases
Solution Approach 1:
The patent merges multiple functional groups (silane groups with hydroxyl or alkoxy groups and carbodiimide groups) into a single polyurethane adhesive formulation. This combination allows the adhesive to achieve heat resistance improvement without requiring separate processing steps or additional materials, thereby managing formulation complexity while enhancing thermal performance.
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 adhesive exhibits improved heat resistance and mechanical strength, maintaining bond integrity even at elevated temperatures, making it suitable for industrial lamination applications.
Implementation Method 1
The silane groups contain at least one hydroxyl group or one alkoxy group. Generally, these are alkoxy groups; during subsequent use, the alkoxy groups hydrolyze to hydroxyl groups, which then react further or crosslink.
Implementation Method 2
the hydroxyl groups, which then react further or crosslink
Implementation Method 3
Carbodiimide groups can be easily obtained from two isocyanate groups by eliminating carbon dioxide: -RN=C=O + 4=C=NR -RN=C=NR-+CO2
Data Source
AI summary
Disclosed is an adhesive containing a polyurethane and 0.0001 to 0.1 mole of carbodiimide groups per 100 g of polyurethane. Said adhesive is characterized in that the polyurethane has a concentration of 0.0001 to 0.1 mole of hydroxysilane or alkoxysilane groups (silane groups) per 100 g of polyurethane.