Polyurethane catalyst DY-33

2021-11-25   Pageview:290

DY-33: 33% solution of triethylenediamine, widely used in the preparation of polyurethane foam, also used in the production of polyurethane adhesives.
















Replacing a single organic or inorganic flame retardant with a composite flame retardant in the fire retardant coating can not only improve the fire retardant performance of the fire retardant coating, but also improve its physical, chemical and mechanical properties and weather resistance. The reason is that this composite flame retardant is composed of a phosphorus-containing inorganic flame retardant and an organic halide flame retardant.

Its phosphorus content is relatively high. In case of fire, on the one hand, phosphorus and oxygen And hydrocarbon compounds burn to generate phosphide, carbon monoxide, water vapor and other substances. This process has less heat of reaction than carbon directly generates carbon dioxide, so it slows down combustion and is flame retardant; on the other hand, phosphorus forms pyrophosphoric acid to metaphosphoric acid when burned , Metaphosphoric acid can be polymerized into a very stable polymer state, which acts as a protective layer for flammable materials and insulates oxygen.

In addition, the process of heat dehydration to generate pyrophosphoric acid and metaphosphoric acid can promote the formation of carbonized materials on the surface of the material to play a flame retardant effect. Since the composite flame retardant contains organic halides (take Br and Cl as an example), when the composite flame retardant is exposed to fire, Br or Cl thermally decomposes to produce HBr or HCl, and the amide modified polyethylene wax sds thermally decomposed HBr or HCl reduces the concentration of HO. The speed of combustion and flame propagation is reduced, the chain reaction is weakened to the end, and it has the effect of suppressing smoke. During the reaction process, a large amount of water is generated. It needs to absorb heat when it becomes water vapor at the combustion temperature. On the one hand, water vapor acts as a diluent to reduce the concentration of combustible gas, and on the other hand, it covers the surface of the substrate to isolate oxygen. The temperature drop of the system slows down the combustion and controls the development of the fire, thereby improving the fireproof performance of the fireproof coating and making it have efficient fireproof performance.

In addition, the addition amount of organic and inorganic composite flame retardants also affects the performance of fire retardant coatings. Can organic and inorganic composite flame retardants and other components of fire retardant coatings cooperate with each other to form a complete and organic fire protection system. Another key issue of whether the fire resistance and physical and chemical properties of the coating is good or not is the determination of the amount of composite flame retardant added is very important. In order to find the best value of the compound flame retardant, we fixed the other components in the three fire retardant coatings, and then added different amounts of the compound flame retardant to make fire retardant coatings with different proportions. The proportioned fire retardant coating is applied to the wooden plywood substrate in the same amount, and after drying, a small-scale combustion test is carried out. At the same time, the physical and chemical properties of the sample are tested. Determine the optimal value range of the composite flame retardant.


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