- 本站编辑：杭州纳尔森精细化工有限公司发布日期：2018-05-29 21:25 浏览次数：
With the expansion of the application of polymer composites and the increase of consumption, the application of flame retardants and flame retarding technology have also made some progress and progress. Phosphorus flame retardants have been widely applied in various aspects due to their wide variety and excellent flame retardancy. In the future study of phosphorus flame retardants, more attention should be paid to the development direction of flame retardants with high thermal stability and good solubility.
Flame retardants are used as additives to prevent materials from being ignited and to suppress flame propagation. It is mainly used for flame retardant synthesis and natural polymer materials. It is an indispensable chemical material in our life. Since the extensive use of organic synthetic polymer materials, human beings have begun to face new fire threats. At present, the form of fire in the world is very severe. Therefore, the chemical additives such as flame retardants are particularly important.
1. Categories and basic requirements of Flame Retardants:
According to the relationship between flame retardants and flame retardants, flame retardants can be divided into two categories: additive type and reactive type. The former is only physically dispersed in the substrate and used in thermoplastic polymers. The latter is used as a monomer or auxiliary reagent to participate in the synthesis of polymers, and finally becomes a structural unit of polymers, which is used for thermosetting polymers.
According to the flame retardant elements, the commonly used flame retardants are divided into halogen, organophosphorus and halogen - phosphorus, nitrogen, phosphorus and nitrogen, antimony, Al - Mg, inorganic phosphorus, boron, silicon, molybdenum. There are also a class of intumescent flame retardants and a nano inorganic material, which can be combined with a series of polymers to form flame retardant polymer / inorganic nanocomposites.
Two. What are the basic elements of the flame retardant:
1. High flame retardancy efficiency
2, we should have the following ecological and environmental characteristics:
(1) harmless to people, animals and plants
(2) difficult migration
3. The amount of toxic or corrosive gas released during hot cracking and combustion is less.
It is easy to recycle, not deteriorate or deteriorate the performance of mechanical recovery products.
Compatibility with environment
3. Good compatibility with flame-retardant substrate
4. Sufficient thermal stability
5, not too much deterioration of the processing properties of flame retardant substrate.
6. Acceptable light stability
7, raw materials are abundant, manufacturing process is simple, and price can be accepted by users.