Bladder Release Agent Emulsion for Tire Vulcanization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for lubricating expandable rubber bladders during the vulcanization of raw tires in metal presses face challenges with sliding properties and durability, leading to frequent defects and reduced productivity due to the adhesion between the bladder and the tire, which results in limited demolding cycles before reapplication of the release agent is required.
Innovation Solution
A method involving a release agent composition in the form of an oil-in-water emulsion applied to the external surface of the bladder or internal surface of the tire, comprising reactive polyorganosiloxanes, crosslinking agents, non-reactive polyorganosiloxane oils, glass beads, surfactants, and additives, which forms a durable barrier to enhance sliding properties and extend the number of demolding cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a release agent is applied to the bladder surface to prevent adhesion, then the sliding properties are improved, but the durability decreases requiring frequent reapplication
Solution Approach 1:
The release agent is applied to the bladder surface before vulcanization begins, establishing the lubricating barrier in advance. The composition is designed to remain effective throughout the entire vulcanization cycle and subsequent demolding operations, preventing adhesion between the bladder and tire during the expansion and curing processes.
Solution Approach 2:
The release agent is formulated as a complex composition containing multiple functional components: reactive polyorganosiloxanes for crosslinking and durable adhesion, non-reactive polyorganosiloxane oils for lubrication, glass beads for enhanced sliding properties, surfactants for emulsion stability, and various additives for optimized performance. This composite formulation simultaneously achieves both improved sliding properties and extended durability.
2Ease of manufacture
If the bladder surface is lubricated to prevent sticking during vulcanization, then the tire demolding is facilitated, but the bladder wears and roughens reducing its service life
Solution Approach 1:
The release agent acts as an intermediary substance between the bladder rubber and the tire casing, preventing direct contact and adhesion during vulcanization. The composition creates a protective barrier that reduces friction and wear on the bladder surface while facilitating easy demolding of the cured tire.
Solution Approach 2:
The release agent composition undergoes parameter changes during vulcanization, including crosslinking of the reactive polyorganosiloxane components that enhance its durability and adhesion to the bladder surface. The glass beads maintain their spherical shape and distribution, providing consistent low-friction properties throughout the service life of the bladder.
3Device complexity
If a simple lubricant is used on the bladder, then the application process is simple, but the number of demolding cycles is limited before reapplication is needed
Solution Approach 1:
The release agent is applied to the bladder surface before vulcanization begins, establishing the lubricating barrier in advance. The composition is designed to remain effective throughout the entire vulcanization cycle and subsequent demolding operations, preventing adhesion between the bladder and tire during the expansion and curing processes.
Solution Approach 2:
The release agent is formulated as a complex composition containing multiple functional components: reactive polyorganosiloxanes for crosslinking and durable adhesion, non-reactive polyorganosiloxane oils for lubrication, glass beads for enhanced sliding properties, surfactants for emulsion stability, and various additives for optimized performance. This composite formulation simultaneously achieves both improved sliding properties and extended durability.
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 an expandable rubber bladder with improved sliding properties and increased durability, allowing for multiple demolding cycles without significant degradation, thus enhancing productivity and reducing the frequency of release agent reapplication.
Implementation Method 1
comprising reactive polyorganosiloxanes, crosslinking agents
Implementation Method 2
glass beads
Implementation Method 3
surfactants
Data Source
AI summary
The present invention relates to a method for lubricating a bladder made of expandable rubber useful during vulcanization of a green tire in a metal press. Said method is characterized in that compositions in the form of silicone oil emulsions are applied onto the inner surface of the green tires and/or onto the outer surface of the vulcanization bladders so as to facilitate the molding/demolding thereof during the manufacture of said tires.