Adhesive Polymer Composition for Multilayer Pipe Delamination
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Solution Overview
Problem
Multilayer structures, such as coated metal pipes, face adhesion issues between layers of different materials, leading to potential delamination, especially in high-temperature applications where existing adhesive materials do not meet the required softening temperature standards.
Innovation Solution
An adhesive polymer composition comprising 80.0 to 98.0 wt% ethylene polymer, 2.0 to 20.0 wt% ethylene-butylacrylate copolymer, and up to 4.0 wt% additives, with the ethylene-butylacrylate copolymer containing 3.0 to 5.5 wt% units derived from butylacrylate, and both components being grafted with an acid grafting agent, enhancing softening properties and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an adhesive layer is added between epoxy and polyolefin layers to prevent delamination, then adhesion between layers is improved, but the Vicat softening temperature requirement becomes harder to meet in high-temperature applications
Solution Approach 1:
The adhesive composition uses a composite system combining ethylene polymer (80-98 wt%) with ethylene-butylacrylate copolymer (2-20 wt%), where the copolymer contains 3-5.5 wt% butylacrylate units. This composite material structure provides both the adhesion needed to prevent delamination and the thermal stability required to meet Vicat softening temperature specifications of ≥85°C (ISO standard) or ≥100°C (market requirement in hot climates).
Solution Approach 2:
The patent optimizes specific compositional parameters: the butylacrylate content is controlled at 3-5.5 wt% to balance adhesion and softening properties, while the overall copolymer content is limited to 2-20 wt% to maintain thermal stability. These parameter adjustments ensure the adhesive layer achieves both strong bonding and sufficient heat resistance for high-temperature applications.
2Reliability
If conventional adhesive materials are used to achieve adhesion, then layer bonding is improved, but delamination occurs in high-temperature environments
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating ethylene-butylacrylate copolymer with controlled butylacrylate content (3-5.5 wt%) into the adhesive system. This compositional change enhances the thermal stability of the adhesive layer, preventing thermal degradation and delamination in high-temperature environments while maintaining effective layer bonding.
Solution Approach 2:
The patent replaces conventional adhesive materials with a specifically formulated polymer composition that inherently resists thermal degradation. This substitution eliminates the need for additional heat-resistant additives or protective layers, providing a cost-effective solution that maintains adhesion reliability under thermal stress.
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 polymer composition exhibits improved softening properties and adhesion, meeting or exceeding the required Vicat softening temperature of 100 °C, thereby preventing delamination and ensuring the integrity of multilayer structures in high-temperature environments.
Implementation Method 1
wherein the ethylene polymer or the ethylene polymer and the ethylene-butylacrylate copolymer have been grafted with an acid grafting agent
Data Source
AI summary
The present invention relates to an adhesive polymer composition comprising a) an ethylene polymer, b) an ethylene-butylacrylate copolymer, and c) additives, based on the total weight of the adhesive polymer composition, wherein the ethylene-butylacrylate copolymer contains units derived from butylacrylate in an amount of from 3.0 to 5.5 wt%, based on the adhesive polymer composition and the ethylene polymer or the ethylene polymer and the ethylene-butylacrylate copolymer have been grafted with an acid grafting agent.