Catalyst-Supported Hybrid Particles for Polyurethane Rate Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies face challenges in developing catalysts that can adjust the initiation rate for polyurethane polymerization, leading to inadequate pot life and curing rates in plastic bonded explosives (PBX).
Innovation Solution
A catalyst-supporting organic-inorganic hybrid composite particle is developed by mixing an alkoxy silane-functionalized polyurethane precursor with tetraethyl orthosilicate and supporting a catalyst on the resulting particle. This composite particle adjusts the initiation rate for polyurethane polymerization by controlling the release of the reaction catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a polyurethane reaction catalyst is added to accelerate polymerization, then the curing rate is improved, but the pot life is shortened and the slurry hardens too quickly during charging
Solution Approach 1:
The catalyst system is segmented into multiple components: a catalyst-supporting particle containing a polyurethane reaction catalyst, and a catalyst activator. The catalyst remains inactive until the activator is added, at which point it becomes active and accelerates the polymerization reaction. This segmentation allows the slurry to maintain a long pot life during charging operations, and then rapidly cure once the activator is introduced.
2Productivity
If the catalyst activity is increased to reduce charging time, then the curing rate is improved, but the slurry becomes too viscous too quickly making charging difficult
Solution Approach 1:
The catalyst is prepared in advance and supported on particles, but it is kept in an inactive state until the charging operation is complete. The catalyst activator is then added to trigger the polymerization reaction. This preliminary preparation of the catalyst in an inactive form allows the slurry to remain pumpable and chargeable, and then rapidly cure once the activator is added.
3Productivity
If a conventional catalyst is used to speed up polymerization, then the curing rate is improved, but the initiation rate cannot be controlled and the reaction starts too early
Solution Approach 1:
A catalyst activator serves as an intermediary substance that triggers the activation of the catalyst-supporting particle. The activator contains a hydroxyl group that reacts with the catalyst precursor on the particle surface, converting it from an inactive to an active state. This intermediary mechanism provides precise control over the initiation rate, allowing the reaction to start at the desired moment rather than too early.
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 method effectively extends the pot life and adjusts the curing rate of polyurethane, improving workability and ensuring suitable processing conditions for PBX applications.
Implementation Method 1
preparing a catalyst-supporting particle by mixing and reacting an alkoxy silane-functionalized polyurethane precursor with tetraethyl orthosilicate
Implementation Method 2
preparing a catalyst-supporting particle by mixing and reacting an alkoxy silane-functionalized polyurethane precursor with tetraethyl orthosilicate
Implementation Method 3
supporting a catalyst on the catalyst-supporting particle
Implementation Method 4
adjusting an initiation rate for polyurethane polymerization through a rate at which a reaction catalyst is released from the catalyst-supporting organic-inorganic hybrid composite particle
Data Source
AI summary
The present invention relates to a catalyst-supporting organic-inorganic hybrid composite particle, and more particularly, to a technique of adjusting a desired pot life and curing speed by preparing a catalyst-supporting organic-inorganic hybrid composite particle by adding a catalyst for polyurethane reaction to a catalyst-supporting particle prepared by stirring an alkoxy silane-functionalized polyurethane precursor and the tetraethyl orthosilicate for a certain period of time and mixing them, and adjusting an initiation rate for polyurethane polymerization through the prepared catalyst-supporting organic-inorganic hybrid composite particle.