Now that there are more and more high-rise buildings in cities, fire protection is a concern of the whole society. Epoxy resin fire retardant coatings have been gradually developed. Epoxy resin fire retardant coatings have been recognized by the society with facts for their excellent performance There is a tendency to replace the thick fire retardant coatings and occupy the dominant position in the market.
At present, thick fire retardant coatings are generally used as fire retardant coatings in outdoor or humid environments, especially in structures where there is a danger of hydrocarbon fires. However, with the gradual and widespread application, the disadvantages of such coatings are self-reliance, easy to fall off, sensitive to mechanical impact, and not resistant to chemical corrosion. The lack of suitable outdoor fire retardant coatings has become a major problem in the domestic coatings industry. However, abroad, a new type of outdoor fire-retardant paint epoxy fire-retardant paint has replaced the thick fire-retardant paint, and has been widely used in structures with hydrocarbon fire hazards, marine facilities, petrochemical and petroleum installations, and offshore oil platforms. There are many advantages in choosing epoxy resin as the film-forming material of the fireproof coating. First of all, epoxy resin has good fluidity, strong adhesion and high mechanical strength. The epoxy resin structure contains aliphatic hydroxyl groups, ether groups and very active epoxy groups. It is suitable for most materials such as wood, metal and glass. , Plastic, rubber, leather, ceramics, fibers, etc. have good adhesion; the cured epoxy resin has excellent chemical resistance, heat resistance, acid and alkali resistance, and good electrical insulation. The fire-retardant coating formulated by it has good adhesion, anti-corrosion and mechanical strength. Secondly, the epoxy fire retardant coating has the sealing property, and the flame retardant components will not migrate to the coating surface, so its fire resistance is less affected by time and environment; especially the epoxy resin fire retardant coating can be kept intact after the explosion occurs. Adhering to the substrate, it is more suitable for offshore oil platforms, oil fields, oil refineries and petrochemical plants than traditional intumescent fire retardant coatings.
Another important reason for choosing epoxy resin as a film-forming agent is that epoxy resin can be used as a carbon-forming agent (carbon source) for intumescent fire retardant coatings. Traditional theory believes that the carbon-forming agent is the material basis for forming a non-flammable foam carbonized layer. It plays a skeleton role for the foamed carbonized layer. They are some high-carbon polyhydroxy compounds. A large number of experiments have confirmed that epoxy resin can be used as a carbon-forming agent, and can also react with a dehydration catalyst to form a porous carbonized layer. The UL laboratory in the United States has tested and evaluated epoxy fire retardant coatings and believes that they are fully suitable for outdoor use. According to the British company AvcoSpecialityMaterials, which has been engaged in research and production of epoxy fire retardant coatings for many years, epoxy resins are good film-forming materials for fire retardant coatings, especially on outdoor and indoor rigid surfaces. At present, the intumescent fire retardant coatings used in China, some active ingredients will slowly precipitate out under wet conditions, which affects the fire prevention effect. Epoxy resins have no similar problems due to their excellent sealing properties. Not allowing active ingredients to be analyzed is the key to maintaining the durability and weather resistance of fire retardant coatings. American PPG Company believes that outdoor fire-retardant coatings should be dominated by epoxy coatings. Their reason is that epoxy coatings have better corrosion resistance and lighter weight. In addition, because the epoxy fire retardant coating has excellent impact strength, adhesion and moisture resistance, it can also be used in some indoor places such as swimming pools, baths and high-rise buildings.
Compared with domestic general fireproof coatings, epoxy fireproof coating has advantages in three aspects: First, epoxy resin has strong sealing performance and can be widely used outdoors. At present, domestic outdoor use thick fireproof coatings, which are used in epoxy Fire-retardant coatings are still a blank. They are far behind developed countries in the research and application of outdoor fire-retardant coatings. Second, epoxy resins are thermosetting resins that have the function of resistance to hydrocarbon fires. Most fires in petrochemical enterprises belong to hydrocarbons. For fires, epoxy fire retardant coatings are widely used abroad in structures with a risk of hydrocarbon fires. At present, offshore oil platforms under construction in China all buy foreign epoxy fire retardant coatings at an expensive price; third is the coating of epoxy fire retardant coatings The thickness is only 0.8 ~ 1 cm, the decoration effect is better. my country's understanding, research, testing and application of outdoor fire-retardant coatings are far behind those of foreign countries. Both in terms of technology and flame retardant theory, it lags far behind foreign standards. The Marine Chemical Research Institute has been engaged in the research of epoxy intumescent fire retardant coatings for many years. The solvent-free epoxy intumescent fire retardant coatings developed and their preparation methods have obtained invention patents this year, but due to the misunderstandings in the selection of outdoor fire retardant coatings in China and the gap in detection methods , Has not yet been applied in the market. At present, the traditional acrylic intumescent fire-retardant coating is widely used in China and can only be used indoors. With the development of my country's petroleum industry and the accelerated pace of offshore oil exploration, the demand for outdoor fire-resistant coatings that are resistant to hydrocarbon fires and explosions will increase. my country's fire-resistant coating industry must increase its research and development efforts.