In the production of methyl methacrylate (MMA) casting sheets, although the material has reached the prepolymerized state required by the process after the high-temperature polymerization reaction in the boiling kettle, prolonged exposure to high temperatures can cause residual initiators to continue initiating chain reactions, easily leading to viscosity runaway, yellowing, or even gelation and spoilage.
To address this, we have designed an MMA cooling kettle: a key post-processing device with a volume matching the boiling kettle (2–3 tons), specifically designed to rapidly cool the high-temperature MMA prepolymer liquid to room temperature. Through efficient cooling and controlled stirring, it completely "freezes" the polymerization reaction, ensuring the material maintains chemical stability during subsequent storage, degassing, or molding processes.
Core Functions
- Receives high-temperature MMA liquid from the boiling kettle;
- Utilizes industrial cooling circulating water as a cold source to efficiently cool the entire kettle of material to room temperature;
- Completely terminates the polymerization reaction, preventing post-polymerization, explosive polymerization, or viscosity drift;
- Provides a temperature-stable and consistent qualified slurry for vacuum degassing, filtration, and mold casting.
Technical Parameters
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Effective Volume |
PMMA cooling reactors are available in volumes of 2000 L / 2500 L / 3000 L (fully matched with the front-end cooking vessel, processing capacity 2–3 tons). |
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Cooling Method |
Dual cooling structure with outer jacket + inner coil, using ambient temperature cooling circulating water, eliminating the need for a refrigeration unit and reducing operating costs. |
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Agitation System |
● Agitation Type: Propeller-type agitator; ● Speed Range: 0–130 rpm, steplessly adjustable frequency, adaptable to cooling needs across all stages from low-viscosity monomers to high-viscosity prepolymers. |
|
Main Body Material |
S304 stainless steel, mirror-polished inner surface, corrosion-resistant, no precipitation, ensuring optical-grade purity. |
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Control System |
PLC automatic control, real-time monitoring of material temperature, linked adjustment of agitation speed and cooling water valve, supports setting cooling curves and endpoint heat preservation. |
Why must it be cooled to ambient temperature?
MMA prepolymer liquid still retains significant polymerization activity above 50°C. Only by cooling to room temperature (≤35°C) can the initiator be largely deactivated, ensuring absolute stability during long-term storage or before molding, and avoiding the risk of batch quality fluctuations or complete batch scrap.
Product Advantages
High Efficiency and Energy Saving
Utilizes only the factory's existing cooling water system, requiring no additional refrigeration equipment, resulting in economical operation and maintenance.
Thorough Cooling
Dual-loop heat exchange + high-speed stirring (up to 130 rpm) enhances heat transfer, ensuring uniform temperature between the center and edges.
Strong Process Compatibility
Wide speed range meets the mixing and heat dissipation requirements of different viscosity stages.
Safe and Reliable
Fully enclosed nitrogen-sealed operation eliminates the risk of oxidation and self-polymerization.
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