Water-Based Mold Release Agent for Tire Production
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Solution Overview
Problem
The molding industry faces challenges with existing mold release agents, particularly semi-permanent VOC-based compositions that pose environmental and safety hazards, and require frequent applications, limiting tire production due to curing time and potential contamination risks.
Innovation Solution
A water-based, VOC-free mold release agent utilizing a modified polyorganosiloxane with multiple reactive moieties for adhesion and crosslink density, combined with emulsifiers and additives, providing excellent release ease, longevity, and rapid curing for multiple uses without hydrogen gas production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-permanent VOC-based release agents are used, then release ease and longevity are improved, but environmental safety and production continuity are worsened due to curing time requirements and contamination risks
Solution Approach 1:
The patent changes the chemical composition parameters of the release agent by replacing VOC-based solvents with water as the primary carrier, and using modified polyorganosiloxane with multiple reactive moieties instead of traditional single-reactivity polymers. This parameter change eliminates harmful VOC emissions while maintaining the semi-permanent longevity特性 through controlled crosslinking reactions that proceed without extended curing times.
Solution Approach 2:
The invention creates a composite release agent system combining modified polyorganosiloxane (with multiple reactive moieties), water, emulsifiers, and various additives. This composite formulation achieves both environmental compatibility (VOC-free) and performance requirements (release ease, longevity) by synergistically combining materials that address different functional requirements simultaneously.
2Duration of action of stationary object
If traditional polyorganosiloxane with single reactive moiety is used, then adhesion is achieved, but crosslink density and longevity are insufficient
Solution Approach 1:
The patent segments the polymer structure into distinct functional regions: hydrophobic polyorganosiloxane backbone segments provide release properties, while multiple pendant reactive moiety segments (epoxide, oxetane, or isocyanate groups) enable extensive crosslinking. This segmentation allows each part of the molecule to fulfill its specific function optimally, achieving high crosslink density without requiring an entirely complex molecular architecture.
Solution Approach 2:
The invention applies local quality by concentrating multiple reactive moieties at specific locations along the polymer chain (pendant positions) rather than distributing functionality uniformly. This localized concentration of reactive groups at strategic positions enables high crosslink density in the formed coating, enhancing longevity and abrasion resistance without complicating the overall polymer synthesis process.
3Object-affected harmful factors
If water-based system is used, then environmental compatibility is improved, but adhesion and crosslinking efficiency are worsened compared to VOC-based systems
Solution Approach 1:
The patent introduces emulsifiers as intermediary substances that mediate between the water-based carrier and the hydrophobic polyorganosiloxane release agent. These emulsifiers create stable water-in-oil or oil-in-water emulsions that allow the hydrophobic polymer to disperse uniformly in water during application, then reorganize into an adherent film upon drying and curing, maintaining both environmental compatibility and adhesion reliability.
Solution Approach 2:
The invention changes the physical state parameters of the release agent system by transitioning from a solvent-based clear coating to a water-based emulsion system. This parameter change affects application properties (sprayability, drying rate) and curing behavior, but the multiple reactive moieties compensate for any reduction in crosslinking efficiency by providing multiple reaction sites that ensure adequate crosslink density even in water-based conditions.
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 offers environmental compatibility, rapid curing, and extended longevity, reducing labor and material costs while ensuring safe and efficient tire production without hazardous emissions.
Implementation Method 1
Permanent release agents exhibit excellent adhesion to the mold surface
Implementation Method 2
modified polyorganosiloxane with multiple reactive moieties for adhesion and crosslink density
Data Source
AI summary
A mold release composition is provided contains a minimum of three reactive moieties per molecule to provide for both mold adhesion and crosslink density. The composition is soluble in a VOC-free organic solvent or water, alone or with resort to an emulsifier. The composition can be used as a semi-permanent mold release in some embodiments.