Polyurea Powder Preparation via High-Pressure Impingement Mixing
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Solution Overview
Problem
Manufacturing polyurea greases is challenging due to the difficulty in consistently producing uniformly fine polyurea powder that is readily dispersible in lubricating base oil on an industrial scale, and the process involves hazards associated with handling amines and isocyanates.
Innovation Solution
Polyurea compounds are prepared by reacting amines and isocyanates in the presence of a liquid diluent in a high-pressure impingement mixing device, producing a powder with the diluent dispersed, which is then processed to form a grease under standard conditions without the need for shearing or pulverizing large particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If polyurea compounds are prepared by reacting amines with isocyanates directly in base oil, then the grease can be formed, but the polyurea particles are large (100 to 400 microns) and difficult to disperse uniformly
Solution Approach 1:
The patent applies preliminary action by first dissolving the amine in a liquid diluent before reacting it with isocyanates. This pre-dissolution step ensures that the amine is in a readily dispersible state before the reaction occurs, resulting in fine polyurea powder particles (1 to 10 microns) that are inherently easy to disperse in base oil without requiring subsequent pulverizing or shearing operations.
2Ease of manufacture
If large polyurea particles (100 to 400 microns) are used, then the manufacturing process is simpler, but the particles are not readily dispersible in base oil and require additional shearing or pulverizing
Solution Approach 1:
The patent applies parameter changes by modifying the reaction conditions, specifically conducting the reaction in the presence of a liquid diluent and controlling the temperature (e.g., heating to 60-80°C). These parameter changes result in the formation of fine polyurea powder with uniform particle size (1 to 10 microns) that is readily dispersible, eliminating the need for additional size reduction steps while maintaining manufacturing simplicity.
3Productivity
If conventional methods are used to handle neat amines or isocyanates, then the reaction can proceed, but there are significant safety hazards associated with handling these substances
Solution Approach 1:
The patent applies the intermediary principle by using a liquid diluent as a mediator. The amine is dissolved in the diluent before reacting with isocyanates, which reduces the hazards associated with handling neat amines. The diluent acts as a safe intermediary that allows the reaction to proceed efficiently while minimizing safety risks during handling and processing.
4Shape
If polyurea powder is pulverized to reduce particle size, then smaller particles are obtained, but additional equipment and processing steps are required
Solution Approach 1:
The patent applies preliminary action by forming the polyurea powder with the desired fine particle size (1 to 10 microns) directly during the reaction process, rather than producing large particles and subsequently pulverizing them. This is achieved by reacting amines dissolved in liquid diluent with isocyanates under controlled conditions, eliminating the need for additional pulverizing equipment and processing steps.
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 results in a fine, porous, and sponge-like polyurea powder that is easily dispersible in base oil, reducing manufacturing risks and improving grease properties, such as penetration and dropping point, while being less dense and having a larger surface area compared to conventional methods.
Implementation Method 1
polyurea compounds are prepared by reacting amines and isocyanates in the presence of a liquid diluent
Implementation Method 2
reacting amines and isocyanates in the presence of a liquid diluent in a high-pressure impingement mixing device
Data Source
AI summary
A system and device for preparing polyurea compounds. The system comprising a chamber for reacting amines and isocyanates in the presence of a liquid diluent in a high-pressure impingement mixing device under conditions sufficient to produce a polyurea compound having the consistency of a powder and in which diluent is dispersed.