Solid Anaerobic Threadlocker Resolving Curing Gaps
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Solution Overview
Problem
Conventional liquid anaerobic threadlockers face issues such as incomplete curing through large gaps, difficulty in curing exposed bondlines due to air exposure, and poor solvent resistance, leading to potential contamination and integrity problems.
Innovation Solution
An anaerobically curable composition comprising a liquid (meth)acrylate monomer component, a solid (meth)acrylate resin component, and a curing component, with a solid thermoplastic polyurethane resin, which can be applied in a dry-to-touch form and cures upon exposure to an anaerobic environment, providing a balance between threadlocking and adhesive performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If liquid anaerobic threadlockers are used, then threadlocking performance is improved, but incomplete curing through large gaps occurs
Solution Approach 1:
The patent changes the physical state parameter of the threadlocking composition from liquid to solid form. This solid state allows the composition to maintain its position and cure effectively through large gaps without flowing away or failing to cure due to air exposure, resolving the contradiction between threadlocking performance and curing completeness.
Solution Approach 2:
The patent utilizes phase transition by employing a solid composition that can be applied in a controlled manner and then transitions to a cured state. The solid form enables reliable application and positioning before curing, ensuring complete curing even in challenging applications with large gaps or exposed bondlines.
2Strength
If liquid anaerobic threadlockers are used, then adhesive performance is improved, but poor solvent resistance occurs
Solution Approach 1:
The patent changes the physical state from liquid to solid, which fundamentally alters the composition's interaction with solvents. The solid matrix provides better resistance to solvent penetration while maintaining adhesive performance through proper formulation of the solid composition containing anaerobically curable components.
3Ease of operation
If liquid anaerobic threadlockers are used, then ease of application is improved, but difficulty in curing exposed bondlines occurs
Solution Approach 1:
The patent changes the state from liquid to solid, which allows the composition to be applied in a controlled manner without flowing or dripping. The solid form ensures that the composition remains in place on exposed bondlines and can cure reliably once the anaerobic environment is established, eliminating the curing issues associated with liquid formulations.
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 achieves effective threadlocking and adhesive performance with improved solvent resistance and integrity, ensuring reliable bonding even in applications with large gaps and varying temperatures.
Implementation Method 1
Anaerobically curable compositions which are applied as threadlocking compositions to threaded parts remain stable (in an uncured state), and thus in liquid form, until they are placed between interlocked threaded parts where they cure in the absence of oxygen.
Implementation Method 2
Polymerization is initiated by the presence of free radicals, often generated from peroxy compounds.
Implementation Method 3
a solid thermoplastic polyurethane resin having a molecular weight in the range of from 40,000 g/mol to 100,000 g/mol and a melting point in the range of from 40° C. to 80° C.
Data Source
AI summary
An anaerobically curable composition comprising:a liquid anaerobically curable component;a solid anaerobically curable component;a solid thermoplastic polyurethane resin having a molecular weight in the range of from 40,000 g/mol to 100,000 g/mol and a melting point in the range of from 40° C. to 80° C.;anda curing component for curing the anaerobically curable components.Advantageously, the compositions of the invention are substantially solid and may be used as threadlockers.