Chemical name: Dibutyltin dilaurate
Molecular formula: C32H64O4Sn
Sn content: 18.5~19.5%
Density (25°C): 1.07±0.02g/ml
Boiling point: >204°C/12mm Hg
Refractive index: (20°C): 1.471
Physical properties standard: a light yellow liquid, low temperature into white crystals
At present, fire-resistant coatings for pre-stressed concrete floor slabs are developing in the direction of light weight and high fire and heat insulation. Since the inorganic material itself is incombustible, it has good fire resistance, high mechanical strength, oil resistance, water resistance, acid and alkali resistance, non-mold, non-toxic, and odorless, and has no adverse effects on reinforced concrete materials. This type of fireproof coating has been widely used. Following this principle, after a large number of screening tests, flame retardants and flame retardant additives are determined. Generally, composite inorganic flame retardants and aluminum-containing amide modified polyethylene wax formula inorganic refractory materials are used as flame retardant additives.
The structure of the selected composite inorganic flame retardants is Contains a lot of crystal water. This is of great significance to the fire resistance of prestressed concrete floor fire-resistant coatings; the selected inorganic fire-resistant and sun-burning materials are light-weight, high-strength, and have low thermal conductivity. The amount of flame retardants and sun-burning additives selected has an optimal value. If the flame retardant is used too much, its fire and heat insulation effect will be good, but the physical and chemical properties of the fire retardant coating will be affected; if the amount of flame retardant is too small, Its physical and chemical properties are good, but the fire and heat insulation effect of the coating is poor. The effect of the amount of flame retardant on the performance of this type of fireproof coating is shown in Table 23-32.
It can be seen from Table 23-32 that the amount of flame retardant additive is about 45%. At this time, the fire retardant coating not only has efficient fire and heat insulation properties, but also has excellent physical and chemical properties.
In addition, the choice of flame retardant additives must first consider its impact on the stability of the base material; secondly, consider the impact of particle size and shape on the performance of the fire retardant coating. According to this principle, flame retardant additives with a fineness of less than 320 mesh and a plasticizer function are generally selected. The addition of flame-retardant additives plays a role in softening the flame-retardant particles, improving the weather resistance and toughness of the fire-retardant coating, and at the same time greatly reducing the cost of the fire-retardant coating. Its dosage is generally about 10%. In the formula, it is also necessary to select inorganic materials that can absorb heat, expand, absorb heat, and lose heat at high temperatures as aggregates, use aluminum silicate fibers as reinforcing materials, and use appropriate chemical aids. Agent.
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