Silica-Bound Nitroso Compounds for Rubber Bonding
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Solution Overview
Problem
Existing vulcanization and bonding compositions face challenges with hazardous materials, poor durability under harsh conditions, and environmental concerns, particularly with the use of nitroso compounds and other reactive agents.
Innovation Solution
A particulate material comprising a solid carrier material, such as silica, covalently bonded with a nitroso compound or its precursor, which acts as a safe and effective alternative for improving bond durability and resistance in vulcanization and bonding processes, especially for rubber-to-metal and rubber-to-glass applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional nitroso compounds are used as vulcanization agents, then effective curing and bonding properties are achieved, but hazardous materials and environmental concerns arise
Solution Approach 1:
The patent uses silica gel as an intermediary carrier to deliver the nitroso compound to the reaction site. The nitroso compound is adsorbed onto the silica gel surface, allowing controlled release during vulcanization while reducing the harmful effects of free nitroso compounds in the formulation. This mediator approach maintains curing effectiveness while mitigating environmental and safety concerns.
Solution Approach 2:
The patent employs porous silica gel material to carry the nitroso compound. The porous structure provides high surface area for adsorption, enabling the nitroso compound to be held in a controlled manner and released gradually during the vulcanization process. This reduces the concentration of free hazardous materials while maintaining the necessary curing functionality.
2Strength
If conventional bonding compositions are used, then rubber-to-metal bonding is achieved, but bond durability under harsh conditions (high temperature, pressure, moisture) deteriorates
Solution Approach 1:
The patent creates a composite bonding system combining silica gel carrier, nitroso compound, and rubber composition. This composite approach provides enhanced bond durability by integrating multiple functional components: the silica gel provides structural stability, the nitroso compound enables crosslinking, and the combination resists degradation under harsh conditions of high temperature, pressure, and moisture exposure.
Solution Approach 2:
The patent utilizes changes in physical parameters during vulcanization (temperature, pressure) to activate the nitroso compound from the silica gel carrier. The controlled release and reaction are triggered by these parameter changes, ensuring optimal bonding performance while maintaining resistance to subsequent environmental stressors.
3Stability of the object's composition
If nitroso compounds are used in vulcanization, then effective crosslinking is achieved, but safety and environmental hazards increase
Solution Approach 1:
Silica gel acts as an intermediary that reduces environmental hazards by containing and controlling the release of nitroso compounds. The carrier material prevents excessive exposure to hazardous substances while still enabling effective crosslinking reactions to occur during the vulcanization process.
Solution Approach 2:
The porous silica gel structure provides controlled containment of the nitroso compound, allowing it to be released in controlled amounts during processing rather than being freely present in the environment. This reduces environmental hazards while maintaining crosslinking efficiency.
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 solution provides enhanced bond durability and resistance to high temperatures, pressures, and moisture, offering a safer and more environmentally friendly alternative to traditional vulcanization agents while maintaining effective curing properties.
Implementation Method 1
wherein said nitroso compound and/or said nitroso precursor compound is covalently bonded to the solid carrier material
Implementation Method 2
an aromatic oxime as a nitroso precursor compound
Implementation Method 3
A particulate material comprising a solid carrier material, such as silica, covalently bonded with a nitroso compound or its precursor, which acts as a safe and effective alternative for improving bond durability
Data Source
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AI summary
A particulate material which is a particulate carrier material optionally comprising one or more hydroxyl groups to which a nitroso or nitroso precursor compound is bonded. A desirable particulate carrier material is a silicaceous material, for example, silica. Such materials are useful in bonding of ealstomeric materials such as rubber and in vulcanisation.