Time：2021-04-09 Edit：小編Number hits：278
Why is the storage life of RTV dealcoholized RTV so short
107:2.0kg (750 viscosity 1.5kg + 3000 viscosity 0.5kg)
Alumina: 4.0KG (3000 mesh)
Zinc oxide: 0.2kg (nanometer)
The above materials are mixed in the double planet machine (stirring speed: 75, dispersing speed: 1162), heated (105 ~ 110 ℃), vacuumized (- 0.1MPa) and dehydrated for 3.5 hours. After cooling to room temperature, add 107% 5% crosslinking agent (methyltrimethoxysilane: 50g; vinyltrimethoxysilane: 50g), stir in vacuum for 40 minutes, continue to add 0.6% total water removal agent (hexamethyldisilazane), 0.5% total 792, and 0.05% total T12, stir in vacuum for 30 minutes, take samples for detection, 2 minutes for surface crusting, and 5 minutes for surface drying Cool. After discharging, the material is put into a 300ml plastic cylinder and sealed for storage.
After 6 days at room temperature, the skin began to form after 1.5 hours, and the surface was dry after 20 hours. Later, the dosage of crosslinking was doubled, that is, 10% of the 107 dosage. Check when discharging, skin formation in 1 minute, dry surface in 1 minute and 20 seconds. After discharging, the material is put into a 300ml plastic cylinder and sealed for storage.
At room temperature: 3 days later, 10 minutes later; 10 days later, 28 minutes later, 17 days later, 63 minutes later.
Heat dissipation glue xingyongwei shares: why the storage period of dealcoholized glue is so short. It takes 1.5h for a batch to form skin after six days. Shouldn't the dosage of T12 be increased? It's not good to add more crosslinking agent. (when the material is just discharged, the surface crusts in 2 minutes. It's very fast. You can't add T12 any more.) what's the temperature of the newly made material? It's about 30 degrees, and it won't exceed 35 degrees. Try increasing the amount of titanium complex to 1.6%. Use titanate as catalyst, and the storage is stable!
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