Inorganic Tin Emulsion Composition for Stable Aqueous Curing
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Solution Overview
Problem
Existing silicone emulsion compositions face issues with storage stability, toxicity, and inadequate curing due to the use of organic tin compounds, and inorganic tin compounds are difficult to use in aqueous systems due to hydrolysis and deactivation.
Innovation Solution
An inorganic tin emulsion composition comprising an inorganic tin compound, hydrocarbon oil, surfactant, and water, with a manufacturing method using an emulsifying apparatus to achieve particle sizes of 500 nm or less, ensuring stability and suitability for aqueous systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an organic tin compound is used as a curing catalyst, then the curing speed and rubber film strength are improved, but the toxicity increases and environmental safety deteriorates
Solution Approach 1:
The patent changes the chemical composition parameter from organic tin compound to inorganic tin compound while maintaining the catalytic function. This parameter change resolves the contradiction by providing equivalent curing performance without the toxicity associated with organic tin compounds.
Solution Approach 2:
The patent uses an inorganic tin compound that can be used in smaller amounts effectively, reducing the overall harmful substance load while maintaining curing performance. The emulsion formulation allows for efficient catalyst utilization.
2Object-affected harmful factors
If an inorganic tin compound is used in an aqueous system, then the toxicity is reduced, but the compound undergoes hydrolysis and deactivation
Solution Approach 1:
The patent uses an emulsion system where the inorganic tin compound is dispersed as fine particles (average particle size 0.01-10 μm) in an aqueous medium containing surfactants. The emulsion acts as an intermediary that protects the inorganic tin compound from hydrolysis while maintaining its catalytic activity, resolving the contradiction between toxicity reduction and stability.
Solution Approach 2:
The patent changes the physical state parameter of the inorganic tin compound from bulk to emulsified fine particles. This parameter change increases the surface area to volume ratio and allows the compound to remain stable in aqueous systems by preventing aggregation and hydrolysis, while maintaining catalytic effectiveness.
3Ease of operation
If a condensation reaction is used to form silicone rubber film, then the curing can proceed without platinum catalyst, but the curing speed decreases and longer time is required
Solution Approach 1:
The patent creates a multi-functional system where the inorganic tin emulsion serves both as a curing catalyst and provides water-based environmental safety. The emulsion formulation includes components that facilitate both condensation and addition reactions, allowing flexible curing pathways depending on the application requirements.
4Duration of action of stationary object
If the organopolysiloxane is stored for long periods, then the material availability is improved, but the polymerization increases and molecular weight increases making storage impossible
Solution Approach 1:
The patent extracts the curing catalyst (inorganic tin compound) from the organopolysiloxane emulsion formulation, creating a separate catalyst component. This separation prevents premature polymerization during storage while allowing the emulsion to be stored indefinitely. The catalyst is added only when curing is required, resolving the contradiction between storage duration and composition stability.
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 inorganic tin emulsion composition provides excellent storage stability, low toxicity, and improved film properties such as hardness and tensile strength, making it suitable as a curing catalyst for aqueous systems.
Implementation Method 1
an inorganic tin compound with high catalytic activity needs to be used to obtain a sufficiently cured rubber film in a short period of time
Implementation Method 2
a manufacturing method of an inorganic tin emulsion composition comprising a step of forming emulsion particles by using an emulsifying apparatus to emulsify a mixture
Data Source
AI summary
The present invention is an inorganic tin emulsion composition comprising: (A) an inorganic tin compound: 100 parts by mass; (B) a hydrocarbon oil: 5 to 100 parts by mass; (C) a surfactant: 5 to 50 parts by mass; and (D) water: 50 to 2,000 parts by mass. Thus, the present invention provides an inorganic tin emulsion having good storage stability and a manufacturing method of the same.