According to reports, the European Union currently has the most stringent standards for halogen content in materials. For example, the EU's halogen-free standard for IT products is that the halogen content is below 800 ppm. Many Chinese electrical products exported to the EU must meet the requirements of these regulations. Therefore, the new halogen-free flame retardant has become a new product in line with the development trend of international standards, and therefore has become one of the fastest growing varieties of various types of material additives.
"The positioning of my research institute has always been very clear, that is, to be an incubation link between colleges and pure enterprises, to achieve the needs of downstream enterprises from the perspective of practicality." Ye Wen admitted, "halogen-free flame retardants need to be further developed, We must continuously improve its performance and cost advantages. The existing APP flame retardants cannot be avoided, and our research institute has successfully developed an efficient PAPP halogen-free flame retardant system, which is expected to replace APP as the next A core component of the first generation of halogen-free flame retardants. "
The typical advantages of PAPP are: first, it avoids the inherent shortcomings of the APP system, it is not easy to precipitate, and there is no water slip; second, it has higher thermal stability, and the 1% thermal decomposition temperature is 295 ° C, which can adapt to higher processing temperatures Thirdly, the added amount is low. After the compounding, in the pure PP resin system, 20-22% of the added amount can achieve UL94V-0 (1.6mm) flame retardant grade. Fourth, it can be applied to a variety of systems, such as PP. , PE, TPE and PP glass fiber reinforced, filler-filled systems.
At present, the PAPP halogen-free flame retardant system developed by the research institute mainly includes three products: ANTI-610, ANTI-NH2 and ANTI-10. Ye Wen made relevant case introductions for the above three products. For example, PP materials with 30% and 28% ANTI610 added can be used for plastic internals of washing machines and coils of vacuum cleaners, and meet UL94V-0 (1.6mm). The key index of 25% of the amount of ANTINH2 acting on the PP substrate, can be used as the front grill of the heater, and meet the requirements of UL94V-0 (1.6mm), 850 ℃ glow wire, good fluidity, no water skid, At present, domestic customers have used this technology to successfully export products to the Middle East, Europe and the United States and Europe, with an annual export volume of 2 million pieces; 25% of ANTI-10 and EVA can be used in the production of flame-retardant heat-shrinkable tubes, with a fire Self-extinguishing, smooth surface without white spots, no precipitation.
Will halogen-free flame retardants replace halogenated flame retardants in the future? the answer is negative. Ye Wen believes that the selection of flame retardants must take into account many factors, such as compatibility with materials, cost performance, ability to meet fire protection requirements, and stability of flame retardant performance during storage. Different flame retardants are suitable for different flame retardant materials according to their flame retardant mechanism. Blind replacement is not only unnecessary, but there may be new risks.
For example, the use of flame retardants in electronic appliances, construction and other materials is a mandatory requirement of fire safety standards, while halogen-free products may not necessarily meet the requirements of fire safety and processing application conditions, and even in certain application environments, halogen resistance Fuel is the most suitable. For example, in the United States, they use a very large amount of cables containing bromine flame retardants, because bromine flame retardants are best used in practice. In addition, there are some cables that are originally metal armored or ceramicized to achieve the purpose of combusting. At this time, it is not appropriate to be too attached to halogen-free.
"In many cases, the existing flame retardant system is okay, but it may change in the future." Ye Wen, who has been helping modified plastics companies to develop halogen-free flame retardant products at the user side, found that when contacting customers, many The original manufacturers of halogen-resistant flame retardant cables, especially those specializing in small-line products such as computer charging cables and mobile phone cables, are now developing halogen-free flame-retardant products, most of which are phosphorus-based and nitrogen-based resistance.燃 剂。 Fuel.
Ye Wen analyzed in the interview that China has four major motivations for the development of halogen-free flame retardants. In terms of cost, China is a country rich in phosphorus and poor in bromine. The cost and environmental impact of the acquisition, processing, and transportation of bromine are far greater than that of phosphorus. In terms of environmental protection, China's bromine resources are mainly concentrated in Shandong. Since the second half of 2017, Shandong has closed about 600 chemical production companies that switched to production and stopped production for more than 2,000. It is expected that bromine flame retardants will maintain a high level for a long time, which directly promotes the development of halogen-free flame retardant materials. In terms of policies, domestic and foreign flame retardants Environmental protection policies are more favored by halogen-free flame retardants; technically, bromine-based flame retardants have shortcomings in terms of smoke density, smoke toxicity, and drips.
The flame retardant research in the world today is developing towards halogen-free. Some halogen flame retardants will withdraw from the historical stage in the future, and new green environmental protection flame retardants will become a hot spot for future research and development.