Silicone Oil Emulsion Release Agent for Tyre Moulding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The stability of silicone oil emulsions used as lubricating compositions for vulcanization bladders in tire manufacturing is compromised by the presence of glass beads, leading to pH instability and loss of SiH functions, which can result in hydrogen release and safety risks, while existing solutions fail to provide adequate sliding properties and durability for multiple demolding cycles.
Innovation Solution
A release agent composition comprising reactive polyorganosiloxanes with silanol groups, crosslinking agents with SiH units, non-reactive polyorganosiloxane oils, glass beads with specific chemical composition, surfactants, and optional additives, forming an emulsion that maintains pH stability and reduces hydrogen release, ensuring excellent sliding properties and durability for multiple demolding cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If glass beads are added to silicone oil emulsion to improve sliding properties, then demolding efficiency is improved, but pH stability deteriorates and SiH functions are lost
Solution Approach 1:
The patent changes the chemical composition parameters of glass beads, specifically controlling SiO2 content at 60-75%, Na2O at 12-20%, and adding specific amounts of Al2O3, B2O3, and MgO. These parameter adjustments optimize the glass bead composition to reduce their negative impact on emulsion stability while maintaining sliding properties.
Solution Approach 2:
The patent creates a composite lubricating composition by combining silicone oil emulsion with specifically formulated glass beads. The composite achieves synergistic effects where the glass beads provide sliding properties while the controlled composition minimizes pH instability, resolving the contradiction between ease of operation and composition stability.
2Productivity
If glass beads are added to silicone oil emulsion to facilitate demolding, then molding-demolding is facilitated, but hydrogen release increases creating safety risks
Solution Approach 1:
The patent modifies the glass bead composition parameters, particularly controlling SiO2 at 60-75% and Na2O at 12-20%, which reduces the catalytic effect on SiH decomposition. This parameter optimization maintains demolding efficiency while minimizing hydrogen gas release and associated safety risks.
3Ease of operation
If conventional glass beads are used in lubricating composition, then sliding properties are improved, but emulsion stability deteriorates
Solution Approach 1:
The patent optimizes glass bead composition parameters including SiO2 (60-75%), Na2O (12-20%), and adds Al2O3 (3-10%), B2O3 (2-7%), and MgO (2-5%). These parameter changes create a more chemically stable glass bead formulation that maintains sliding properties while improving overall emulsion stability and reducing SiH function loss.
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 improved storage stability, reduced hydrogen release, and enhanced sliding properties, allowing for multiple tire molding and demolding cycles without surface degradation, thereby minimizing safety risks and improving operational efficiency.
Implementation Method 1
at least one crosslinking agent (B) having, per molecule, at least three ≡SiH units
Implementation Method 2
reactive polyorganosiloxane (A) comprising per molecule at least two silanol groups ≡SiOH
Implementation Method 3
at least one surfactant (E); the quantities of surfactant(s) and water being sufficient to obtain an oil-in-water emulsion
Implementation Method 4
lubricating composition particularly suitable for the lubrication of vulcanization bladders
Data Source
AI summary
The present invention relates to compositions in the form of silicone oil emulsions intended to be applied to curing bladders as a mould-release agent during tyre production.