Methyl ethyl ketone peroxide (MEKP) is a highly active, thermally unstable substance. Improper storage, transportation and handling can lead to self-accelerating decomposition of the product, and may also occur:
2. Decompose flammable materials and burn rapidly
3. The product precipitates from the solvent and explodes in the event of collision or vibration
4. Reacts violently with pollutants
5. Corrosion and chemical burns
Organic peroxides decompose by heat and emit heat. When the ambient temperature is too high, the heat generated by the decomposition is too late to be released to the environment, and the heat will accumulate and self-accelerating decomposition will occur.
The self-accelerating decomposition temperature SADT of a qualified MEKP curing agent is greater than 50 ° C, and it can be safely stored and transported at normal temperature (SADT = Self Accelerating Decomposition Temperature).
MEKP undergoes self-accelerating decomposition in a closed container, with the release of heat and the generation of large amounts of gas, which can cause thermal explosion.
02—decompose flammable materials and burn rapidly
High-quality methyl ethyl ketone peroxide curing agent has a higher flash point (greater than SADT) and is not flammable. The methyl ethyl ketone peroxide product without dehydration and distillation has residual methyl ethyl ketone and relatively low flash point. The flash point of qualified methyl ethyl ketone peroxide curing agent is generally higher than 35 ℃.
Inferior products with added methanol have a low flash point (methanol flash point = 12 ° C), which greatly increases the risk of the product and does not meet safety standards. Once the methyl ethyl ketone peroxide curing agent ignites, the burning rate is extremely fast.
03—Explosion in case of collision or vibration
Pure methyl ethyl ketone peroxide is sensitive to mechanical collision or friction and is explosive (According to foreign reports, ISIS used pure methyl ethyl ketone peroxide to make explosives for terrorist attacks). To ensure product safety, a safe solvent must be added as a desensitizer, and the total active oxygen content should be controlled to less than 10%.
High-quality methyl ethyl ketone peroxide curing agent, using high-boiling phthalate, aliphatic ester and other safe solvents for desensitization, no explosive under normal storage and transportation and operating conditions
The inferior curing agent has a high water content. In order to reduce costs, a large amount of volatile methanol is used as a solubilizer. Methyl ethyl ketone peroxide is insoluble in water. During storage, transportation and operation, due to temperature changes, methanol volatilization and other factors, product stratification will occur. MEKP precipitated with high concentration can easily explode in case of vibration or impact.
04—Severe reaction in case of pollutants
Methyl ethyl ketone peroxide is a highly reactive substance. When it encounters reducing agents (such as amines), acids, alkalis and heavy metal compounds (such as accelerators, desiccants and metal soaps), it will decompose violently and emit a lot of heat and combustible gases.
The high-quality curing agent uses high-quality raw materials and adopts a distillation dehydration process, which has low impurity content and high stability.
Inferior curing agents use cheap raw materials and dehydration using desiccants, which may introduce metal salt impurities, poor product stability, and potential safety hazards. The stability of the contaminated methyl ethyl ketone peroxide curing agent is reduced, and self-accelerating decomposition may occur at room temperature, causing a fire or explosion.
05—Corrosion and chemical burns
Methyl ethyl ketone peroxide is corrosive. Contact with the skin can cause severe chemical burns; entering the eyes can cause eye damage or even blindness; misuse can cause burns, perforations, and even death in the esophagus and digestive tract.
Eye contact: Immediately rinse with clean water for at least 15 minutes, then seek medical attention.
Skin contact: Remove contaminated clothing and shoes, wash skin thoroughly with soap and water.
Ingestion: Do not induce vomiting, drink plenty of milk or water, and seek medical attention immediately.