Solid Anaerobic Adhesive Using Metallocene and Acetyl Phenyl Hydrazine
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Solution Overview
Problem
Anaerobic curable compositions used in applications like threadlocking remain wet and tacky until cured, leading to contamination and potential loss of material, and existing solutions either require additional components or have risks of skin disruption during handling.
Innovation Solution
A solid anaerobically curable composition comprising a combination of a solid resin component and a solid anaerobically curable monomer, with a curing system that includes metallocene and acetyl phenyl hydrazine, which is free from saccharin to prevent aerobic curing, allowing for a dry-to-touch application that cures anaerobically when confined.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a liquid carrier component is used in anaerobically curable compositions, then the composition can be easily applied and dispensed, but the material remains wet and tacky until cured, leading to contamination and potential loss of material
Solution Approach 1:
The patent changes the physical state parameter of the composition from liquid to solid by using solid resin components and solid anaerobically curable monomers instead of liquid carriers. This parameter change allows the composition to be handled as a solid material that does not remain tacky, eliminating contamination and material loss issues while maintaining curability through anaerobic conditions.
Solution Approach 2:
The patent utilizes phase transition by employing solid components that can be applied and handled in solid form, then transition to a cured state through anaerobic polymerization. The solid resin component and solid monomer maintain a solid phase during handling, avoiding the tacky liquid state problem, and cure when confined in anaerobic conditions.
2Object-affected harmful factors
If additional components are added to achieve dry-to-touch form, then the material can be handled safely, but the composition complexity increases
Solution Approach 1:
The patent extracts and eliminates the liquid carrier component from the composition entirely, using only solid resin components and solid monomers. This extraction removes the source of the tacky problem without requiring additional drying agents or carriers, thereby preventing contamination while maintaining composition simplicity.
3Productivity
If saccharin is used as a cure accelerator, then the curing rate increases, but the composition may cure aerobically which is undesirable
Solution Approach 1:
The patent changes the chemical parameter of the curing system by using metallocene and acetyl phenyl hydrazine instead of saccharin. This parameter change maintains high curing productivity through efficient catalysis while ensuring reliable anaerobic cure control, as the new system does not promote unwanted aerobic curing.
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 provides enhanced bond strength, stability, and eliminates the need for liquid carriers, allowing for safe handling and storage without contamination, with components that are almost 100% reactive, ensuring effective threadlocking and sealing.
Implementation Method 1
Anaerobic adhesive systems are those which are stable in the presence of oxygen, but which polymerize in the absence of oxygen. Polymerization is initiated by the presence of free radicals, often generated from peroxy compounds.
Implementation Method 2
Desirable cure-inducing compositions to induce and accelerate anaerobic cure may include one or more of saccharin, toluidines, such as N,N-diethyl-p-toluidine ('DE-p-T') and N,N-dimethyl-o-toluidine ('DM-o-T'), and acetyl phenyl hydrazine ('APH') with maleic acid.
Data Source
AI summary
An anaerobically curable composition comprising (i) a curing system for curing an anaerobically curable component, comprising a combination of a metallocene such as n-butyl ferrocene and acetyl phenyl hydrazine, (ii) the anaerobically curable component comprising: a) a solid resin component and b) a solid anaerobically curable monomer; and wherein the composition is in solid form and has a melting point in the range from 30° C. to 100° C. The metallocene may be present in the amount from about 0.05% to about 2.5% by weight based on the total weight of the composition and the acetyl phenyl hydrazine is present in the amount from about 0.05% to about 1.75% by weight based on the total weight of the composition. Compositions show greater bond strengths.