Dabco T-12 catalysts are useful in the manufacture of rigid polyurethanes. In applications where the use of amino catalysts alone presents a catalytic deficiency, organometallics such as Dabco T-12 catalysts can create a synergistic effect of increased activity with Dabco amino catalysts, making them suitable for rigid foam manufacturing where high speed catalysis is required. Even high-density structural foams, sprayed wall insulation adhesives and rigid panels are manufactured in high-speed lines. Even with levels as low as 0.1phr polyol base, Dabco T-12 is a highly efficient catalyst for fast gelation and debonding time.
Dabco T-12 can be used in one-component moisture-curing polyurethane coatings, two-component coatings, adhesives and sealing layers.
The flame retardant of this ultra-thin intumescent steel structure fire-retardant coating is phosphorus and nitrogen system composite flame retardant. Due to the synergistic effect of phosphorus and nitrogen system composite flame retardant P-N, the flame retardant effect is very good. It is prepared by reacting phosphoric acid, aluminum hydroxide and diammonium hydrogen phosphate as raw materials under certain conditions.
It has the characteristics of strong chemical bonding, high temperature resistance, good thermal stability, shock resistance, and peeling resistance. Because it is an alkaline solution of phosphate, it can form a dense passivation film on the surface of steel, which is used for fire protection of steel structures. In the coating, it not only makes the coating expand and foam when exposed to fire to form a uniform, strong and dense heat insulation layer, but also has a certain anti-corrosion effect. In order to improve the anti-corrosion performance of the coating and the strength of the foam layer, and prevent the foam layer from being broken by the flame or the foam layer falling off, it is also necessary to add a certain amount of flame retardant additives, such as modified barium metaborate, polyphosphoric acid Aluminum and aluminum oxides.
The thick-coated steel structure fire-retardant coating is made of high-efficiency heat insulation and flame-retardant additive aggregates (such as expanded vermiculite), inorganic binders as the main raw materials, and some lightweight flame-retardant additives (such as microbeads, expanded perlite, etc.) are added. amide modified polyethylene wax emulsion Stir and mix with chemical additives.
In thick-coated fire-retardant coatings, the flame retardant additive calcium carbonate can thicken and thicken the coating, and play a filling and leveling effect. Therefore, the flame-retardant additive light calcium carbonate is usually added to the thick-coated fire-retardant coating to reduce The dry density of the fireproof coating. Generally, the addition amount of light calcium carbonate can reach about 20%.
Application examples of fireproof coatings for prestressed concrete floor slabs
The application examples of flame retardants in fireproof coatings for prestressed concrete floors are shown in the table.
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