Self-Locking Anaerobic Formulation for Bolt Sealing
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Solution Overview
Problem
Existing anaerobic curing and crosslinkable formulations for sealing and blocking agents, such as those used for screws and bolts, require primers and polymerization inhibitors, limiting their curing strength range and mechanical properties, and often result in inferior blocking forces and resistance to heat and chemicals.
Innovation Solution
Development of a self-locking formulation in aqueous emulsion containing dimethacrylate, microencapsulated polymerization initiator and accelerator, without polymerization inhibitors, which can be applied directly to screw threads without primer, providing improved blocking force, heat resistance, and chemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If polymerization inhibitors are added to existing anaerobic curing formulations, then shelf life is improved, but blocking force and curing strength are reduced
Solution Approach 1:
The patent removes polymerization inhibitors from the formulation entirely, replacing their shelf-life protection function with a microencapsulated initiator system that only activates upon anaerobic curing. This extraction of the harmful component (inhibitor) while maintaining the beneficial function (shelf stability through controlled activation) resolves the contradiction between shelf life and blocking force.
Solution Approach 2:
The microencapsulated initiator acts as an intermediary that mediates between storage stability and curing activation. The encapsulation provides physical protection during storage (analogous to inhibitor function) while the controlled release upon anaerobic exposure enables strong curing without permanent inhibition. This intermediary mechanism allows both long shelf life and high blocking force to coexist.
2Strength
If primers are used with existing sealing formulations, then adhesion is improved, but device complexity and application steps are increased
Solution Approach 1:
The patent develops a formulation that inherently provides both adhesion and blocking functions without requiring separate primer applications. The anaerobic curing mechanism and microencapsulated initiator system work together to create a multi-functional product that bonds to substrates and provides mechanical locking in a single application step, eliminating the need for primers and reducing application complexity.
Solution Approach 2:
The formulation is designed to be self-sufficient, with the microencapsulated initiator automatically activating upon anaerobic exposure during tightening. The system performs adhesion and blocking functions intrinsically without requiring external primer treatments or complex preparation steps, making the product self-service and simplifying the overall application process.
3Speed
If conventional anaerobic formulations are used, then curing speed is achieved, but resistance to heat and chemicals is insufficient
Solution Approach 1:
The patent employs a composite formulation combining acrylic resin, microencapsulated initiator, and accelerator in a synergistic system. This composite approach creates a curing mechanism that achieves rapid anaerobic reaction while the specific material composition provides enhanced thermal and chemical resistance. The interaction between components creates a more reliable cured product that maintains strength under harsh conditions.
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 self-locking formulation achieves enhanced detachment values, resistance to vibration, heat, and aggressive chemicals, with improved sealing and blocking performance, and prolonged shelf life without the need for primers or inhibitors.
Implementation Method 1
anaerobic curing/crosslinkable formulations based on acrylic resins in aqueous emulsions
Implementation Method 2
curing/crosslinkable formulations
Implementation Method 3
a polymerization accelerator can be added to the composition, for example organometallic compounds, which contain a fraction of ferrocene
Data Source
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AI summary
Anaerobic curing formulations for sealing and/or blocking screws, nuts, bolts and screw or sealing caps are described. The sealing formulation comprises at least one acrylic resin and phenoxy-polyethoxy sulphate. The self-locking formulation comprises at least one diacrylate, an acrylic resin, a microencapsulated polymerisation initiator and a microencapsulated polymerisation accelerator. A method is described for coating a polymerization accelerator to obtain a microencapsulated polymerisation accelerator.