Structural Adhesive Composition Using High-Molecular-Weight Tertiary Amine
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Solution Overview
Problem
Tertiary amines used in structural adhesives, such as dimethyl-para-toluidine and dimethylaniline, have limitations in curing parameters and exothermicity, making them unsuitable for certain industrial applications, particularly in terms of gelation speed and toxicity.
Innovation Solution
A high-molecular-weight tertiary amine, like 4,4′,4″-methylidynetris(N,N-dimethylaniline) or 'leuco crystal violet', is used as a cure accelerator in combination with a phosphate-ester-based adhesion promoter and a peroxide-type radical polymerization initiator, enhancing gelation speed and mechanical properties while reducing toxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional tertiary amines (dimethyl-para-toluidine, dimethylaniline) are used as cure accelerators, then high degree of curing and mechanical strength are achieved, but gelation speed is insufficient and toxicity is high
Solution Approach 1:
The patent changes the molecular weight parameter of the tertiary amine from low (traditional amines) to high (new compounds with molecular weight >150 g/mol). This parameter change simultaneously improves gelation speed and reduces toxicity while maintaining mechanical strength, as the high molecular weight structure provides both rapid reaction kinetics and reduced harmful effects.
Solution Approach 2:
The patent creates a composite cure accelerator system by combining high-molecular-weight tertiary amines with specific structural features (aromatic groups, electron-donating substituents). This composite molecular structure achieves multiple functions: rapid gelation through reactive amino groups, reduced toxicity through high molecular weight, and maintained strength through aromatic stabilization.
2Reliability
If traditional tertiary amines are used as cure accelerators, then high degree of curing is achieved, but exothermicity control is poor
Solution Approach 1:
The patent changes the molecular weight parameter of the tertiary amine from low to high (>150 g/mol). This parameter change dilutes the concentration of reactive groups per unit mass, thereby reducing the intensity of exothermic reactions while maintaining overall curing efficiency through the high reactivity of the amino groups.
3Strength
If traditional tertiary amines are used as cure accelerators, then high mechanical performance is achieved, but toxicity is high making them unsuitable for certain applications
Solution Approach 1:
The patent increases the molecular weight parameter of the tertiary amine (>150 g/mol), which reduces toxicity while maintaining mechanical performance. The high molecular weight structure reduces the volatility and bioavailability of the amine, thereby reducing harmful effects while the aromatic groups and electron-donating substituents maintain the curing efficiency needed for strong adhesive bonds.
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 high-molecular-weight tertiary amine accelerates adhesive gelation, improves mechanical performance, and allows for the use of structural adhesives in new applications by controlling exothermicity and maintaining high curing efficiency, enabling rapid bonding of diverse materials with improved stress distribution.
Implementation Method 1
a catalyst for curing and setting the adhesive... This catalyst is a free-radical polymerization initiator, in particular based on peroxide
Implementation Method 2
The cure accelerator serves to promote curing and hardening of the adhesive when the catalyst is added... such amines improve the rapidity of gelation of adhesives
Implementation Method 3
a conjugated system exhibiting an absorption in the visible field of the electromagnetic spectrum, so as to generate a coloration of said polymer or of said cement during the reaction for polymerizing said monomer
Implementation Method 4
a phosphate-ester-based adhesion promoter
Data Source
AI summary
The invention relates to a composition for a structural acrylic adhesive that comprises an adhesion promoter including a phosphate ester and a high molecular-weight polyamine as a polymerization accelerator.