Glass Microbubble Composition for Low-Energy High-Strength Manufacturing
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Solution Overview
Problem
The glass microbubbles industry faces challenges in reducing costs while maintaining acceptable physical properties such as crush strength and density, with existing methods often resulting in multi-cellular, weak, and chemically non-durable products.
Innovation Solution
The development of glass microbubble compositions consisting of specific weight percentages of silicon, calcium, sodium/potassium, boron, phosphorus, and zinc, with a controlled phosphorus-to-boron ratio, which require less energy to manufacture and can be formed into high-strength, single-cell microbubbles without additional fluidizing agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional glass microbubble manufacturing processes are used, then physical properties such as crush strength and density can be achieved, but manufacturing energy consumption is high and costs increase
Solution Approach 1:
The patent applies parameter changes by optimizing the glass composition ratios (specifically SiO2: 65-75 wt%, B2O3: 10-20 wt%, Na2O: 5-15 wt%, CaO: 3-10 wt%) and controlling the phosphorus-to-boron weight ratio between 0.5-2.0. These compositional parameter changes enable the formation of high-strength single-cell microbubbles at lower manufacturing energies below 12000 BTU/lb, resolving the contradiction between achieving high crush strength and reducing energy consumption
Solution Approach 2:
The patent uses composite materials by creating a multi-component glass system combining silica, boron oxide, sodium oxide, calcium oxide, and phosphoric acid in specific proportions. This composite glass composition achieves superior strength-to-density ratios and forms durable single-cell structures that require less manufacturing energy compared to conventional single-component glass systems
2Reliability
If conventional glass compositions are used, then manufacturing can proceed with existing processes, but product quality is multi-cellular and weak
Solution Approach 1:
The patent achieves reliable single-cell product quality by changing the compositional parameters to specific ranges: SiO2 increased to 65-75 wt%, B2O3 to 10-20 wt%, with controlled P/B weight ratios of 0.5-2.0. These parameter changes promote uniform bubble formation and prevent multi-cellular defects, producing consistent high-quality single-cell microbubbles
Solution Approach 2:
The patent applies local quality by ensuring uniform distribution of phosphoric acid and boron oxide throughout the glass matrix at controlled concentrations. This uniform local composition throughout the material ensures consistent single-cell structure formation across all microbubbles in the batch, eliminating weak multi-cellular regions
3Ease of manufacture
If energy reduction measures are implemented, then manufacturing costs decrease, but physical properties may deteriorate
Solution Approach 1:
The patent changes the manufacturing parameters by using a optimized glass composition that requires lower processing energy (below 12000 BTU/lb) while maintaining or improving physical properties. The specific composition ratios enable exothermic reactions during firing that reduce external energy requirements while simultaneously achieving high crush strength and low density
Solution Approach 2:
The patent utilizes the exothermic oxidation of carbonaceous materials (coke, charcoal, or organic binders) included in the feed as an internal energy source. This accelerated oxidation provides the necessary heat for glass melting and bubble formation without requiring excessive external energy input, thereby reducing manufacturing costs while maintaining high physical properties
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 approach reduces manufacturing energy consumption and costs while achieving high crush strength and low density, resulting in glass microbubbles with improved physical properties and reduced environmental impact.
Implementation Method 1
heating and expanding feed to provide the raw product
Data Source
AI summary
Glass microbubbles include on an average weight basis: from 25.0 to 37.4 percent by weight of silicon; from 5.7 to 8.6 percent by weight of calcium; from 5.2 to 14.9 percent by weight, on a total combined weight basis, of at least one of sodium or potassium; from 0.3 to 0.9 percent of boron; and from 0.9 to 2.6 percent of phosphorus, wherein the weight ratio of phosphorus to boron is in the range of from 1.4 to 4.2, and wherein the glass microbubbles comprise less than 0.4 percent by weight of zinc. A raw product including the glass microbubbles, and methods of making the raw product are also disclosed.