Vacuum Mixing for Moisture-Sensitive Prepolymer Production
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Solution Overview
Problem
Existing methods for producing moisture-sensitive products, such as silicone sealants, face challenges in preventing premature cross-linking during production, storage, and transportation, leading to reduced shelf life and increased production costs due to moisture exposure.
Innovation Solution
A method involving a mixing vessel under vacuum pressure to remove air and moisture, with controlled addition of cross-linking agents and thickeners, and using dried air to maintain a low moisture environment, ensuring minimal reaction with reactive end groups and extending the shelf life of the products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If moisture-sensitive products are produced and stored in conventional environments, then production and storage can proceed normally, but premature cross-linking occurs reducing shelf life
Solution Approach 1:
The patent applies inert atmosphere by using vacuum pressure (removing oxygen and moisture) and filled atmospheres with inert gases (nitrogen, carbon dioxide) to create an environment that prevents moisture and oxygen from reaching the moisture-sensitive products during storage and transportation, thereby preventing premature cross-linking and extending shelf life
Solution Approach 2:
The patent uses packaging materials with barrier properties as intermediaries between the products and the external environment. These packaging materials act as mediators that selectively block moisture and oxygen while allowing controlled conditions inside the packaging, preventing premature reaction without compromising product integrity
2Reliability
If vacuum pressure is applied to remove air and moisture, then premature cross-linking is prevented, but equipment complexity increases
Solution Approach 1:
The patent makes the vacuum system multi-functional by using it not only for removing air and moisture during production but also for maintaining inert atmosphere during storage and transportation. The same vacuum technology is applied across multiple process stages (production, packaging, storage) to provide consistent protection against moisture while avoiding the need for separate complex systems at each stage
3Manufacturing precision
If cross-linking agents and thickeners are added controllably, then product quality is maintained, but production time increases
Solution Approach 1:
The patent applies preliminary action by pre-mixing cross-linking agents and thickeners under vacuum conditions before final product formulation. This allows the components to be prepared in advance in a controlled moisture-free environment, ensuring uniform distribution and optimal reaction conditions while reducing the time needed for quality control adjustments during final production
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
This approach effectively reduces premature cross-linking, extends the shelf life of moisture-sensitive products, and simplifies the production process by minimizing equipment steps and safety risks, while maintaining product quality and stability.
Implementation Method 1
the closed mixing vessel is put under a vacuum pressure
Implementation Method 2
the gas is a dried air
Data Source
AI summary
Described is a method for the production of a moisture curable composition, using a mixing vessel for the production of the prepolymer by the reaction of a reactive polymer with a cross-linking agent, whereby after the introduction of at least one liquid reagent for the reaction or another liquid ingredient of the formulation, the content of the mixing vessel is stirred and the closed mixing vessel is put under a vacuum pressure, whereby the vacuum pressure is at most 0.50 bar absolute (bara), and optionally at least 0.001 bara or 1 mbar absolute, whereby this vacuum pressure is broken by letting dried air into the mixing vessel.