With the increasing awareness of global safety and environmental protection, people's requirements for fire safety and product flame retardancy are becoming higher and higher. Halogen-free, low-smoke and low-toxic environmentally friendly flame retardants have become the goals that people are pursuing. Today I will introduce you to several common environmentally friendly phosphorus flame retardants.
First, phosphorus flame retardant
1.Red phosphorus masterbatch
Among the non-halogen flame retardants, red phosphorus is a better flame retardant, with the advantages of less addition and wide range of uses. Ordinary red phosphorus is easy to absorb moisture and has poor compatibility with polymer materials. It is particularly easy to cause spontaneous combustion and cannot be actually used. Microencapsulated red phosphorus flame retardant reduces the activity of red phosphorus and solves the compatibility. The content of red phosphorus is about 85%, but the problem of spontaneous combustion has not been effectively solved, and the dust pollution is serious.
Red phosphorus masterbatch is a dark red particle with red phosphorus and inorganic flame retardants such as aluminum hydroxide and expandable graphite. It is a dark red particle with a matrix resin as a carrier, and the safety problem has been solved. It has low smoke, high flame retardant efficiency; no dust pollution, excellent processing performance; low density, good thermal stability, and less physical properties of the product; no frost, migration, or corrosion of the mold during processing. In particular, the product has a high resistance to tracking index (cti), which has obvious advantages in the application of electronic appliances. .
The main disadvantage of red phosphorus masterbatch is the color tone problem. In addition to dark red and black, it cannot give products more color choices.
Red phosphorus masterbatch is used for flame retardancy of materials lacking oxygen, such as general plastics, rubber, polyethylene, polypropylene, etc., and is used in combination with magnesium hydroxide and aluminum hydroxide; it is rich in pet, pc, pbt, pa, etc. The flame retardant material of oxygen element can be used alone; in the process of processing, in order to achieve the dispersibility of red phosphorus, a certain amount of dispersant can be compounded. Kalshine produces and develops red phosphorus-based flame retardant concentrates and additives in many polymer applications (PE, PP, PA, PS, ABS, PC/ABS PU). It has flame retardant effect, fire resistance, high concentration, environmental protection and It has ultra-high performance in terms of cost.
2. Resorcinol bis(diphenyl phosphate) reofos rdp
Resorcinol Bis(Diphenyl Phosphate) is a high molecular weight organic phosphine flame retardant, apparently a clear liquid; it has a high phosphorus content and a phosphorus content of 10.8%. It has the characteristics of high flame retardancy, low addition, and little effect on the physical properties of the finished product. It has dual functions of flame retardant and plasticizing, which can make the flame retardant completely non-halogenated, improve the flow processing performance in plastic molding and reduce ablation, improve the thermal aging performance, increase the heat deformation temperature, and suppress the residual after combustion Thing.
When in use, resorcinol bis(diphenyl phosphate) is generally used alone, and does not need to be combined with other flame retardants. It is mainly used for some high-functional styrene copolymers such as ppo/hips and pc/abs. When flame retardant ppo/hips is used, the dosage is about 11%, the oxygen index reaches 37%, and the ul94 level (1.6mm) reaches v-o and level. The flame retardant pc/abs alloy is related to the ratio of pc/abs, and the dosage is generally between 6% and 10%. The oxygen index reaches 29%, and the ul94 level (1.6mm) reaches the v-o level.