Water-Soluble Mandrels for Composite Manufacturing
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Solution Overview
Problem
The existing methods for producing titanated chromium catalysts, particularly for making HDPE, involve an anhydrous route that requires prolonged drying steps, leading to increased costs and reduced efficiency due to VOC emissions and potential loss of melt index potential.
Innovation Solution
A process involving the formation of a water-soluble titanium-silicon complex by contacting a silicon compound with water and an acid or base in a solvent, followed by combining with a titanium compound to create a titanated solid support and chromium catalyst, allowing for continuous production without prolonged drying steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plaster is used as mandrel material, then the mandrel can be easily formed by pouring into a mold, but the curing time is significant and mechanical removal damages the composite structure
Solution Approach 1:
The patent changes the chemical composition parameters of the mandrel material from traditional plaster to a water-soluble polymer composite system. This parameter change enables the mandrel to be formed rapidly without lengthy curing times while allowing removal by water dissolution rather than mechanical agitation, thus protecting the composite structure.
Solution Approach 2:
The patent employs a composite mandrel material consisting of water-soluble polymer binder (such as polyvinyl alcohol or carboxymethyl cellulose), aggregate (such as sand or salt), and optional additives. This composite structure combines the ease of formation from pouring suspensions with rapid water-soluble removal, eliminating both the long curing time and mechanical damage problems of plaster.
2Ease of operation
If eutectic salts are used as mandrel material, then the mandrel can be removed by washing, but the materials are brittle requiring molten casting and produce corrosive waste streams
Solution Approach 1:
The patent changes the chemical composition from eutectic salts to water-soluble polymers with neutral pH. This parameter change maintains the ease of removal by washing while eliminating the corrosive waste stream problem, as the polymer-based mandrels dissolve to produce environmentally benign waste.
Solution Approach 2:
The patent converts the potential harm of waste generation into a benefit by selecting mandrel materials that dissolve into environmentally friendly substances. The water-soluble polymer composite transforms from a waste problem with salts to a beneficial process where the mandrel material becomes harmless upon dissolution, aligning with green manufacturing principles.
3Strength
If polymer foams or balsa wood are used as mandrel material, then the mandrel can withstand pressure and temperature extremes, but the materials are heavy and require destructive removal methods
Solution Approach 1:
The patent employs a composite structure with lightweight aggregate particles suspended in a water-soluble polymer matrix. This composite design provides the necessary compressive strength to withstand resin injection pressures and autoclaving temperatures while maintaining low density. The aggregate provides structural support and the polymer matrix binds the aggregate and provides water-solubility for removal.
Solution Approach 2:
The mandrel material is designed with a porous structure where water-soluble polymer fills the spaces between aggregate particles. This porous composite structure reduces the overall weight compared to solid foam or wood while maintaining adequate strength through the aggregate framework. The porosity also facilitates rapid water penetration for mandrel removal.
4Ease of manufacture
If conventional mandrel materials are used, then the mandrel can be formed in traditional ways, but the production process is labor-intensive and time-consuming
Solution Approach 1:
The patent replaces mechanical mandrel formation processes (molding, machining, assembly) with a chemical approach where the mandrel is formed by pouring a liquid suspension that self-setts or rapidly cures. This substitution eliminates labor-intensive operations while maintaining mandrel quality, thereby increasing production rate.
Solution Approach 2:
The patent incorporates all necessary mandrel components and properties into a single pourable suspension formulation. The preliminary preparation of the slurry with appropriate viscosity and composition allows the mandrel to be formed in one operation without subsequent assembly or processing steps, significantly reducing production time and labor requirements.
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
This method enhances the melt index potential of the catalyst, enabling the production of higher melt index polymers while reducing costs and environmental impact through continuous processing and minimizing VOC emissions.
Implementation Method 1
a melt processing aid capable of reducing the glass transition temperature of the organic binder
Implementation Method 2
an organic binder material that is water-soluble
Data Source
AI summary
Methods for synthesizing a water-soluble titanium-silicon complex by partial hydrolysis are disclosed herein. The titanium-silicon complex can be utilized to produce titanated solid oxide supports and titanated chromium supported catalysts. The titanated chromium supported catalysts subsequently can be used to polymerize olefins to produce, for example, ethylene based homopolymer L and copolymers.