2-Ethylhexyl Methyl Terephthalate Plasticizer for Adhesive Flow and Strength Balance
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Solution Overview
Problem
Adhesives and sealants based on polyurethanes, polyureas, polyacrylates, polysulphides, and their silylated counterparts face challenges in optimizing flow properties and mechanical properties while maintaining ease of processing and smoothness.
Innovation Solution
Incorporating at least 0.32% by weight of 2-ethylhexyl methyl terephthalate into adhesives and sealants composed of polyurethanes, polyureas, polyacrylates, polysulphides, and their silylated derivatives, which improves flow properties and maintains constant tensile properties, making them easier to smooth and process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional plasticizers are used in adhesives and sealants, then processing ease is improved, but flow point and sag resistance are impaired
Solution Approach 1:
The patent applies parameter changes by selecting specific plasticizer types (diisononyl phthalate, diisodecyl phthalate, di-nonyl cyclohexane-1,2-dicarboxylate, or di-n-butyl cyclohexane-1,2-dicarboxylate) and controlling their content within specific ranges (5-40% by weight). This optimization of plasticizer parameters achieves a balance between processing ease and sag resistance, resolving the technical contradiction.
2Stability of the object's composition
If plasticizer content is increased to improve film expandability, then low-temperature elasticity is improved, but tensile strength is reduced
Solution Approach 1:
The patent resolves this contradiction by precisely controlling the plasticizer content parameter within 5-40% by weight and selecting specific plasticizer types. This optimized parameter range maintains low-temperature elasticity while preventing excessive reduction in tensile strength.
Solution Approach 2:
The patent employs composite material principles by formulating adhesives and sealants with specific combinations of polymers (polyurethane, polyurea, polyacrylate, polysulfide, or silane-modified versions) and controlled amounts of specific plasticizers. This composite formulation achieves synergistic effects that balance elasticity and strength.
3Ease of operation
If plasticizer content is increased to improve smoothness, then ease of smoothing is improved, but mechanical properties are impaired
Solution Approach 1:
The patent applies parameter changes by optimizing plasticizer content to 5-40% by weight and selecting specific plasticizer types. This controlled parameter optimization enables easy smoothing while maintaining adequate mechanical properties.
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 adhesives and sealants exhibit improved flow properties and mechanical strength, achieving optimal smoothness and processing ease compared to prior art, thereby solving the problem of balancing flow and tensile properties.
Implementation Method 1
Through their solvency and swelling capacity, they reduce the hardness of the polymer
Implementation Method 2
Through their solvency and swelling capacity, they reduce the hardness of the polymer
Implementation Method 3
Through their solvency and swelling capacity, they reduce the hardness of the polymer
Data Source
AI summary
The invention provides an adhesive or sealant comprising (A) at least one compound selected from the group consisting of polyurethanes, polyureas, polyacrylates, polysulphides, silylated polyurethanes, silylated polyureas, silylated polyethers, silylated polysulphides and silyl-terminated acrylates, and (B) at least 0.32% by weight of 2-ethylhexyl methyl terephthalate, based on the overall adhesive or sealant. A process is disclosed for preparing the adhesive or sealant, and also disclosed is the use thereof for producing material bonds between parts to be joined.