& nbsp; & nbsp;& nbsp; Silicone sealant, as a type of room temperature vulcanized silicone rubber, is mainly made of hydroxyl terminated polydimethylsiloxane as the main raw material. It has excellent aging resistance and mechanical properties, and has good bonding function for most construction materials. It has a wide range of applications in the national economy, especially in the construction of curtain walls. With the development of high-rise curtain walls, the function of sealant is not limited to excellent bonding and aging resistance. The serious fires that have occurred several times have made the fire safety of high-rise buildings a hot topic of focus and discussion in various fields. R999 silicone fire sealant.
nine hundred
  & nbsp; & nbsp; Generally, silicone sealant can be burned at 200-300 degrees Celsius due to its main raw material 107 base adhesive, which is classified as a combustible material from a certain perspective. Later, major manufacturers gradually introduced flame-retardant sealant to solve the problem of general silicone sealant burning. Flame retardant sealant is applied in the construction field where burning is required to be suppressed. The product must comply with GB/T; 24267-2009  Flame retardant sealant for construction& nbsp; Standard. Qualified flame retardant sealant can achieve self extinguishing when leaving the fire, that is, the sealant stops burning without applying flames. However, under continuous flame burning, flame retardant sealant will eventually turn gray like regular sealant and lose its sealing effect. In the context of increasingly emphasizing the integrity of building components in the event of a fire, the fire protection category clearly did not meet the requirements. So flame retardant sealant cannot be used as fire sealant.
  & nbsp; & nbsp; Two situations in the event of a construction gap fire. For example, Ruilangda R999 fireproof sealant is a fireproof sealant designed with the concept of sealing collagen with shape at ultra-high temperatures, and has high-temperature ceramicization function. It not only has the flame retardant ability of flame retardant sealant to self extinguish upon ignition, but also can prevent ashing, powdering, and ceramicization under high temperature or fire conditions. Continuously adhere to the sealing effect of the sealant, effectively maintaining the integrity of the construction components. Prevent cigarettes from becoming popular. It is necessary to comply with the national mandatory standard GB; 23864  Fireproof sealing material& nbsp;& nbsp; The back fire surface temperature should be kept below 180 degrees Celsius for at least 3 hours at 1000 degrees Celsius. The back fire adhesive surface should be kept intact, without cracking or sparking.
  & nbsp; & nbsp; The most important function of the fireproof sealant selected for construction is to emphasize the ability to maintain the integrity of the building components in case of fire. CHF R999 fireproof sealant has the function of a general sealant under normal circumstances, which can bond and seal the gaps in construction, and has a certain displacement ability. When a fire occurs, the fireproof sealant gradually hardens and ceramicizes with the increase of surrounding temperature, playing a role in sealing the gaps and preventing flames and smoke from further dispersing from the gaps.
  & nbsp; & nbsp; Comparison of R999 fireproof sealant with different shapes before and after high-temperature calcination. At room temperature, the morphology of R999 fireproof sealant is consistent with that of general sealant. After high-temperature calcination, general sealant will ash, while R999 will undergo ceramicization with the increase of temperature through the effect of added mineral powder, without ash or powder. The ceramic structure formed by colloid calcination is also affected by the density of bubbles inside the colloid, calcination temperature curve, external pressure and other conditions, resulting in different forms.
  & nbsp; & nbsp; The scanning electron microscope image of the sealant before calcination shows that the powder filler is tightly wrapped by the polysiloxane polymer, exhibiting good cross-linking conditions. The image on the right is a scanning electron microscope image after high-temperature calcination. At high temperatures, the mineral powder in the sealant absorbs heat and undergoes phase transformation, forming a dense ceramic structure. Ensure that the sealant does not powder or break.