Innovative Applications of Fading MEKP and Curing Techniques for Vinyl Ester
May 23, 2024|
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Ava, the team leader of Evergreen Chemicals Organic Peroxide expert database and the brand director of Nouryon, participated in the drafting of OP safety standards and is well versed in the global supply relationship of peroxides.
AVA
Nouryon Brand Director1. The Principle of Fading MEKP
Fading MEKP (Methyl Ethyl Ketone Peroxide) is an advanced curing agent used in composite material production, featuring unique color-changing properties to enhance the convenience and safety of operations.
1.1 Used in Pumping Processes: MEKP is frequently incorporated into resins via automated pumping systems in production lines. The use of fading MEKP ensures precise dosing of the curing agent, thus guaranteeing product quality.
1.2 Visualizing MEKP Dosing: The introduction of fading technology allows operators to visually monitor the distribution of MEKP in the resin, ensuring even mixing and avoiding under or over-curing.
1.3 Typically Uses a Red Indicator: A red indicator is used for its high visibility and contrast, allowing operators to easily track the distribution of MEKP and enhance operational safety.
1.4 Facilitates Timely Material Replenishment by Workers: During production, if MEKP distribution is uneven or insufficient, workers can adjust immediately. This instant feedback mechanism effectively increases production efficiency.
1.5 Completely Fades After Curing: Once curing is complete, the red indicator completely disappears, ensuring the aesthetic quality and performance of the product. This feature eliminates the need for additional post-treatment, saving costs.
Currently, this innovative fading MEKP technology is patented by Nouryon, Arkema, and Unitech, who maintain a technological lead in the market.
2. Curing Characteristics of MEKP in Vinyl Ester Resins
Vinyl ester (VE) resins are high-performance composite matrix materials that exhibit unique curing characteristics when MEKP is used as a curing agent.
2.1 VE Curing is Similar to UPR but Slower: Compared to common unsaturated polyester resins (UPR), VE cures more slowly, allowing for a longer working time suitable for complex manufacturing processes.
2.2 VE Requires a Stable MEKP for Curing: To ensure continuity and quality in the curing process, the MEKP used must provide a stable reaction rate, avoiding defects due to too rapid curing.
2.3 VE Curing Requires Fewer Bubbles, Demanding Higher Purity and Lower Water Content in MEKP: To achieve products with excellent mechanical properties, the curing process for VE must minimize bubble formation, demanding higher purity and lower water content in MEKP.
2.4 VE Curing Typically Involves the Addition of Dimethylaniline as an Accelerator: Dimethylaniline serves as an accelerator to speed up the curing process of VE, enhancing efficiency while ensuring the overall performance of the product.
2.5 VE Curing in Summer Often Uses a Mix of MEKP and CHP: To counteract the effects of high temperatures on the curing process, MEKP is mixed with Cumene Hydroperoxide (CHP) to adjust the curing speed to suit the summer heat.
Ineos and AOC, as well-known manufacturers of vinyl ester resins, commonly recommend using Nouryon's LPT-IN type or Unitech's 925H type MEKP to ensure optimal curing results and product performance.
