Solid Lubricant Bar for Kiln Tires Using Non-Toxic Formulation
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Solution Overview
Problem
Existing solid lubricant bars for hot rotary kilns contain toxic organophosphates, which pose health hazards to personnel handling them, and do not meet the required auto-ignition temperature for high-temperature applications.
Innovation Solution
A solid lubricant bar formulation comprising hydrogenated castor oil or wax, expandable flake graphite, and copper, with optional additives like alumina trihydrate and magnesium hydroxide, providing an auto-ignition temperature above 1000°F (538°C) without toxic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If organophosphates (including triphenyl phosphate) are added to the lubricant bar formulation to raise the auto-ignition temperature above 1000°F, then the auto-ignition temperature is improved, but the formulation becomes toxic and hazardous to personnel health
Solution Approach 1:
The patent removes the toxic organophosphate flame retardants from the lubricant bar formulation while retaining the required fire resistance properties through alternative non-toxic materials and mechanisms
Solution Approach 2:
The patent changes the chemical composition parameters by substituting toxic organophosphates with non-toxic alternatives such as hydrogenated castor oil, castor wax, and expandable graphite, which provide fire retardancy without toxicity
2Reliability
If the lubricant bar is designed for high-temperature kiln environments (requiring auto-ignition temperature above 1000°F), then the temperature resistance is improved, but the formulation requires toxic additives that create handling hazards
Solution Approach 1:
The patent converts the challenge of achieving high fire resistance without toxic materials into a benefit by using naturally fire-resistant materials like hydrogenated castor oil and expandable graphite that provide both temperature resistance and safe handling properties
Solution Approach 2:
The patent uses a composite formulation combining hydrogenated castor oil (60%), regular graphite (35%), and copper (5%), where each component contributes to both fire resistance and non-toxicity, achieving reliable high-temperature performance without handling hazards
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 formulation achieves superior lubrication performance and enhanced fire retardancy, ensuring safe handling and effective operation in high-temperature environments while avoiding toxic compounds.
Implementation Method 1
The temperature of the kiln shell causes the solid lubricant bars to melt and distribute lubricant along the interface between the support pads and the inside bore the kiln tires
Implementation Method 2
Expandable flake graphite
Implementation Method 3
Alumina trihydrate (ATH) and magnesium hydroxide (MDH) can also be added to the formulation to enhance fire retardancy and suppression
Data Source
AI summary
A solid lubricant bar comprising hydrogenated castor oil or wax, expandable flake graphite, and copper. ATH, MDH, and zinc borate can also be added to the formulation to enhance fire retardancy and suppression.