Powder Release Agent Composition for Clean Metal Extrusion
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Solution Overview
Problem
Current lubricant release agents for metal extrusion, such as greases, waxes, and boron nitride, face issues like manual application, safety hazards, incomplete coverage, and environmental contamination due to their properties and behavior at high temperatures.
Innovation Solution
A composition comprising sodium and/or potassium phthalate, optionally with alkaline-earth metal phthalates and solid pigments, applied as a powder to the piston head and metal billet surfaces before extrusion, forming a continuous film barrier to prevent sticking and reduce waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If grease, oil, and/or wax-based pastes are used as release agents, then the billet detachment from piston head is facilitated, but manual application is required and the products drip and create dense fumes at high temperatures
Solution Approach 1:
The invention changes the physical state of the release agent from paste/grease form to powder form, and changes the chemical composition from organic-based (grease, oil, wax) to inorganic-based (boron nitride, magnesium oxide, sodium phthalate). This parameter change eliminates dripping and reduces fume generation while maintaining release effectiveness at high temperatures
Solution Approach 2:
The invention uses a composite powder composition comprising boron nitride (5-50 wt%), magnesium oxide (10-40 wt%), and sodium phthalate (30-60 wt%). This composite material combines the non-stick properties of boron nitride with the high-temperature stability of magnesium oxide and the film-forming capabilities of sodium phthalate, achieving effective release without the drawbacks of conventional organic-based products
2Ease of operation
If boron nitride powder is used as release agent, then billet detachment is improved, but the light powder spreads into the environment and can be inhaled
Solution Approach 1:
The invention combines boron nitride with magnesium oxide and sodium phthalate in a composite powder formulation. The sodium phthalate component (30-60 wt%) acts as a binder that reduces dust generation and environmental spread, while magnesium oxide provides high-temperature stability. This composite approach maintains the excellent release properties of boron nitride while mitigating its dusting problem
Solution Approach 2:
The sodium phthalate and magnesium oxide components serve as intermediary substances that bind the boron nitride particles together, reducing their tendency to spread as fine dust. The composite powder formulation creates a less aerodynamic particle structure that is less prone to becoming airborne and inhalable, while still providing effective release agent functionality
3Ease of operation
If water-based products are sprayed on hot surfaces, then application is simplified, but the Leidenfrost effect creates a vapour barrier preventing uniform film deposition
Solution Approach 1:
The invention changes the base medium from water-based to dry powder form. This parameter change eliminates the Leidenfrost effect entirely, as there is no liquid phase that can vaporize and form barriers. The dry powder is applied directly to the heated surfaces, ensuring uniform deposition and complete coverage without vapour interference, while maintaining ease of application through powder spraying or dusting methods
4Ease of operation
If carbon black is used for surface treatment, then billet detachment is achieved through combustion deposition, but the combustion process is dangerous and harmful if inhaled
Solution Approach 1:
The invention changes the chemical composition from carbon-based (carbon black) to inorganic-based (boron nitride, magnesium oxide, sodium phthalate). This parameter change eliminates the need for combustion entirely, as these inorganic materials are stable at extrusion temperatures and do not require burning to form a protective coating. The materials are applied as stable powders that form protective films without combustion, eliminating both the danger and inhalation hazards associated with carbon black combustion
Solution Approach 2:
The invention uses consumable powder materials that are applied fresh for each extrusion cycle. The sodium phthalate and magnesium oxide components are designed to be consumed during the process, forming protective films that degrade or are removed with the extruded product. This approach eliminates the need for dangerous combustion processes while providing effective, repeatable surface treatment for each cycle
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 composition effectively prevents metal sticking, reduces material consumption, minimizes environmental contamination, and ensures uniform coverage, thereby enhancing the extrusion process safety and product quality.
Implementation Method 1
Said composition has a melting point of between 400 and 450° C., slightly less or equal to the extrusion process temperatures. For this reason, after its application on the at least one surface 101 of the head 100 of the piston 10 of the press 1 and/or on at least one surface 201 of the metal billet 20 it starts to melt thanks to the high temperature of the billet 20 or the head 100 of the piston 10
Implementation Method 2
it starts to melt thanks to the high temperature of the billet 20 or the head 100 of the piston 10 and to spread spontaneously on the treated surface
Implementation Method 3
The subsequent compression between the head 100 of the piston 10 and the billet 20 leads to the complete stretching of a film which covers the entire surface in contact forming a complete and continuous barrier film
Data Source
AI summary
Described is the use of a composition in a process for extruding metals. Said composition includes at least one sodium and/or potassium phthalate and optionally at least one phthalate of an alkaline-earth metal.