? What are the precautions for the use of special fire retardant coatings for tunnels?

With the increasing number of railway tunnels and highway tunnels in China, the fire prevention of tunnels has attracted great attention. At present, professional fire retardant coatings are widely used in tunnel fire prevention in China. What is a special fire retardant coating for tunnels? What are the precautions for its use? Let me answer the following questions for you.

As a special kind of coating, the special fire-retardant coating for tunnel not only has the decorative function of ordinary coating and provides physical protection for cable substrate, but also has the special function of flame retardant and fire resistance, which requires it to foam at a certain temperature to form a fire-retardant insulation layer. Therefore, there are special requirements for its base material, which requires that the base material can be coordinated with the whole coating system, so that the coating not only has good mechanical and physical functions, but also can form a better foam insulation layer in case of fire. In order to achieve a certain flame retardant and fireproof time, it is required that the foam layer does not fall off at high temperature. It is mainly suitable for the fire prevention of highway tunnels and railway tunnels, and also suitable for the fire prevention needs of petrochemical industry, high-rise buildings, steel structures and underground garages.

Matters needing attention in the use of special fire retardant coatings for tunnels

First, the method of use:

1. Before construction, the concrete surface shall be dusted and decontaminated.

2. Paint mixing: mix the ingredients according to the ratio of water: paint = 100: 120. Firstly, water is added into the paint in proportion and stirred evenly, and the prepared paint should be used up within 2 hours. Due to different construction machinery and weather conditions, water can be added as appropriate.

3. Construction method: The construction shall be carried out above 5℃. The thickness of the first spraying is about 3-5 mm, and then the thickness of each spraying is about 3-5 mm until the fire protection design requirements are met. Every construction interval is not less than 24 hours.

4. Surface decoration: If spraying construction is adopted, the coating will be uniform and granular in appearance, with sound absorption function and generally not polished. If it is really necessary to smooth, it should be done after the last spraying. When surface decoration is needed, other decorative materials can be sprayed (brushed) on the surface of the fireproof paint.

Second, the construction matters needing attention:

1, when mixing, the cement slurry is too dry, and the water cement ratio can be appropriately increased, subject to the appropriate construction;

2. In the process of mixing and spraying, the scattered and bounced mud can be recovered in time; Contaminated and cannot be reused for more than 2 hours;

3. Once the paint packaging bag is opened, it should be used immediately, and the paint that is caked with moisture shall not be used;

4. The construction technology can be appropriately adjusted according to the design thickness and construction conditions of the coating.

The above is the introduction of special fire retardant coatings for tunnels. Want to know more about special fire retardant coatings for tunnels, please pay more attention. Times Decoration Network will provide you with more complete, detailed and up-to-date information.