Aqueous Microcapsule Sealing Composition for Low-Chip Thread Locking
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Solution Overview
Problem
Existing compositions applied to threaded members for locking and loosening prevention face challenges in maintaining effectiveness under severe environmental conditions and produce excessive shaved powder and shavings when tightened, especially in aqueous compositions.
Innovation Solution
A polymerizable sealing composition comprising microcapsules with a bisphenol-type epoxy acrylate and aliphatic acrylic monomers, a binder component, and a curing agent, which reduces the production of shaved powder by incorporating the binder component into the microcapsule shell, enhancing adhesion and water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an aqueous composition is used to reduce environmental impact, then environmental compatibility is improved, but locking performance deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters by using aqueous-based microcapsules containing epoxy resin and amine curing agent instead of traditional solvent-based systems. This maintains environmental compatibility while the specific parameter optimization of encapsulation technology ensures the locking performance is preserved through controlled release and curing mechanisms.
Solution Approach 2:
The invention employs composite microcapsule structures combining aqueous outer layers with epoxy resin and amine curing agent interiors. This composite approach allows the system to exhibit both environmental compatibility from the aqueous exterior and effective locking performance from the reactive core materials that cure to form strong bonds on threaded surfaces.
2Reliability
If the capsule shell thickness is increased to improve water resistance, then water resistance is improved, but shaved powder production increases
Solution Approach 1:
The invention optimizes the shell thickness parameter to a specific range that provides sufficient water resistance without excessive material. By carefully controlling the shell formulation and thickness, the system achieves the minimum required protection against water while minimizing the amount of material that could produce shaved powder during tightening operations.
Solution Approach 2:
The invention applies different material properties to different parts of the microcapsule structure. The shell is designed with specific local qualities - sufficient thickness and water-resistant properties at the surface interface - while the interior contains the curing agents. This localized optimization ensures water resistance where needed without unnecessarily increasing overall material that could generate shaved powder.
3Force
If a polyamide resin composition is used for locking effect, then locking effect is achieved through repulsion force, but the locking effect is easily lost under severe environmental conditions
Solution Approach 1:
The invention replaces the mechanical repulsion force mechanism of polyamide resins with a chemical bonding mechanism. Instead of relying on physical repulsion forces that can be overcome by environmental factors, the epoxy resin and amine curing agent undergo chemical reactions to form covalent bonds with the threaded member surfaces, creating a much more stable and reliable locking effect that resists severe environmental conditions.
Solution Approach 2:
The invention fundamentally changes the mechanism parameter from mechanical force (repulsion) to chemical bonding (covalent bonds). This parameter change transforms the locking mechanism from one that is easily affected by environmental conditions to one that is chemically bonded and therefore much more stable under heat, moisture, and mechanical stress.
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 excellent locking performance while minimizing the production of shaved powder and shavings, maintaining effectiveness under heat and stress, and ensuring storage stability.
Implementation Method 1
a polymerizable component included in each microcapsule is polymerized upon breakage of the microcapsule to form a coating film
Implementation Method 2
an element that is present outside the microcapsules (1) and that cures the component (a) and the component (b)
Data Source
AI summary
A polymerizable sealing composition includes a binder component that includes a specific component and microcapsules having a specific configuration. The polymerizable sealing composition is an aqueous composition that has a low impact on the usage environment, exhibits excellent screwing-sealing properties, produces only a small amount of chip and the like during screwing, and ensures good usability. The polymerizable sealing composition includes: (1) microcapsules that include a component (a) and a component (b), the component (a) being a compound that has a bisphenol skeleton, and comprises one or more (meth)acrylic groups in its molecule, and the component (b) being a (meth)acrylic monomer that has a molecular weight within a specific range, and has a specific chemical structure; (2) a binder component that has a specific structure; (3) an element that cures the component (a) and the component (b); and (4) water, in a specific compositional ratio respectively.