Tire Bladder Surface Modification for Release Performance
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Solution Overview
Problem
The existing methods for manufacturing tire bladders result in inferior release performance and sustainability due to vulcanization adhesion between the bladder and the inner liner, leading to damage and inefficiencies in the tire manufacturing process, with previous solutions like release agents providing temporary benefits that are not sustained.
Innovation Solution
A method involving a surface-modified rubber layer on the bladder, formed by molding a rubber composition with modified butyl rubber and an organic peroxide, and applying a siloxane compound with a (meth)acryloyl group, which is then laminated and heat-treated to enhance releaseability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a release agent is applied to the outer surface of the bladder or inner circumferential surface of the unvulcanized tire, then release performance is improved temporarily, but the release effect is not sustained for a long period of time and workability and working environment are adversely affected
Solution Approach 1:
The invention applies a release agent to the outer surface of the bladder before vulcanization molding, and the release agent forms a cured layer that provides sustained release performance throughout the service life of the bladder, eliminating the need for repeated applications
Solution Approach 2:
The invention changes the chemical composition and curing state of the release agent layer to achieve long-term sustainability. The release agent is formulated to cure and form a durable layer that maintains release properties even after repeated expansion and contraction cycles during vulcanization molding
2Ease of operation
If a layer of release agent is formed by applying and curing a release agent made from various types of silicone, then release performance is slightly improved, but the layer cracks and peels as a result of repeated expansion and contraction of the bladder at vulcanization molding
Solution Approach 1:
The invention modifies the chemical composition parameters of the release agent, specifically using a silicone resin with particular molecular weight and structure that provides flexibility and adhesion. The cured layer maintains its integrity during repeated expansion and contraction by adjusting the cross-linking density and molecular structure of the silicone resin
Solution Approach 2:
The invention creates a composite release agent layer by combining silicone resin with specific additives and curing agents that enhance flexibility and adhesion. This composite formulation prevents cracking and peeling while maintaining release performance throughout the service life of the bladder
3Ease of operation
If a lubrication layer with release properties made from two layers, a silicone rubber layer and a silicone resin layer, is formed on the outer surface of the bladder, then release performance is improved, but the silicone rubber layer peels due to repeated expansion and contraction of the bladder at vulcanization molding
Solution Approach 1:
The invention adjusts the molecular weight, structure, and composition parameters of the silicone resin to create a single-layer release agent that provides both release performance and durability. The cured layer has optimized flexibility and adhesion properties that prevent peeling during repeated expansion and contraction cycles
Solution Approach 2:
The invention formulates a composite silicone resin-based release agent that integrates the functions of both silicone rubber and silicone resin into a single durable layer. This composite formulation eliminates the peeling problem by creating a unified, flexible, and well-adhered release layer
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 achieves superior release performance and sustainability of the bladder during tire manufacturing, preventing peeling and maintaining releaseability for an extended period without the need for additional release agents.
Implementation Method 1
applying a siloxane compound having a (meth)acryloyl group to a surface of this rubber molded body; wherein the modified butyl rubber composition (A) includes a modified butyl rubber (1) formed by reacting, with butyl rubber, a compound (a) having a nitroxide free radical in the molecule that is stable at ambient temperature in the presence of oxygen, a radical initiator (b), and a radical polymeric monomer (c) having at least difunctionality
Implementation Method 2
a modified butyl rubber (1) formed by reacting, with butyl rubber, a compound (a) having a nitroxide free radical in the molecule that is stable at ambient temperature in the presence of oxygen, a radical initiator (b), and a radical polymeric monomer (c) having at least difunctionality
Implementation Method 3
forming an uncross-linked body of the surface-modified rubber layer by molding a rubber composition including a modified butyl rubber composition (A) or (B) and an organic peroxide and applying a siloxane compound having a (meth)acryloyl group to a surface of this rubber molded body
Data Source
AI summary
A method for manufacturing a bladder for use in manufacturing tires having a surface-modified rubber layer on an outer surface side of a base rubber layer, including the steps of: forming an uncross-linked body of the surface-modified rubber layer by molding a rubber composition including a modified butyl rubber composition and an organic peroxide and applying a siloxane compound having a (meth)acryloyl group to a surface of this rubber molded body; forming the base rubber layer from an unvulcanized body or vulcanized body formed from a rubber composition different than the modified butyl rubber composition; laminating the uncross-linked body of the surface-modified rubber layer on the outer surface side of the base rubber layer; and heat treating.