Characteristics of flame retardant nylon melt blown nonwoven fabric production line
DATE：2021/6/30 8:58:14 / READ： / SOURCE：This station
Characteristics of flame retardant nylon melt blown nonwoven fabric production line
The addition of flame retardant in nylon resin can solve the shortcomings of nylon easy to burn, and expand the application in the electrical, electronic and electrical industries. From the aspect of performance characteristics, flame retardant nylon and pure nylon have the following changes: 1. The mechanical properties of flame retardant are generally decreased, no matter which kind of flame retardant is added, it has an effect on the mechanical properties of nylon, but the red phosphorus flame retardant nylon is relatively better. For structural components, flame retardant reinforced nylon can meet the needs; 2. The processing flow performance of nylon can be improved by adding low molecular compounds. Especially when the appropriate dispersant is added, the fluidity of the material is improved greatly. It is worth mentioning that the nitrogen flame retardant nylon has excellent fluidity; The heat resistance of bromine flame retardant nylon was decreased compared with pure nylon. Of course, this defect can be made up by adding appropriate antioxidant. In addition, in the process of forming, the processing temperature should be reduced as much as possible to avoid the aging of the material; 4. The friction resistance of nylon will decrease when the flame retardant is added. Therefore, flame retardant nylon is not suitable for wear-resistant materials. Melt blown nonwoven production line www.handern.comThe addition of flame retardant has a great influence on the mechanical properties of the product. Because most of the flame retardant is low molecular compounds, the compatibility with nylon is poor. Therefore, the mechanical properties of nylon will be reduced by adding flame retardant. With the increase of the amount of flame retardant, the impact strength and bending strength of PA6 and PA66 decreased. The dispersion of flame retardant in flame retardant nylon is uniform, which has a certain influence on the flame retardant effect. The surface treatment can improve the bonding and dispersion between flame retardant and nylon matrix, which can reduce the amount of flame retardant, reduce production cost and improve the mechanical properties of the product. The flame retardant suitable for nylon mainly includes organic halide, phosphates and nitrides, and in addition, antimony, boride and other inorganic flame retardant. Considering that inorganic flame retardant has a great influence on mechanical properties of the material, halide, phosphates and nitrides are selected as flame retardant for glass fiber reinforced PA66. See table 4-34 for their flame retardant effect. According to table 4-34, the higher flame retardant grade and higher oxygen index can be obtained by adding halogen flame retardant; The same flame retardant effect can be achieved with a small amount of red phosphorus; However, the flame retardant effect of nitrogen flame retardant is not as good as halide and red phosphorus, because nitrogen can promote PA66 dropping. Therefore, when choosing which flame retardant to use, the flame retardant effect of them on the product should be considered. Melt blown nonwoven production line www.handern.com
The mechanical properties of glass fiber reinforced PA66 were decreased after adding several flame retardant, among which the mechanical properties of glass fiber reinforced PA66 with red phosphorus decreased slightly because of the small amount of additives. The glass fiber reinforced PA66 with bromine flame retardant also retained higher tensile strength and impact strength; The mechanical properties of PA66 reinforced by chloride flame retardant glass fiber decreased greatly. Therefore, when the mechanical properties of the materials are required to be high, red phosphorus and bromine should be selected as flame retardant. In other words, in the actual production, the appropriate flame retardant should be selected to meet the mechanical properties of different nylon flame retardant products. Melt blown nonwoven production line www.handern.com
For single flame retardant, the dosage of red phosphorus is about 5% - 7%, bromine flame retardant is 15% - 17%, and the synergetic sb20 is 5% - 8%, and the nitrogen flame retardant can only reach V-2. The three flame retardant compounds can be used less, indicating that there is a certain synergy between the three. Melt blown nonwoven production line www.handern.com
The decomposition temperature of PA66 is high, and the aromatic bromine flame retardant with better thermal stability is used. Among them, the decabromodiphenyl ether has high resistance efficiency and low cost, but it is easy to penetrate to the surface of the material, and the frost phenomenon is serious. The use of 10 bromodiphenylethane can improve the deficiency. The combustion of PA66 has a drop phenomenon, and adding appropriate amount of montmorillonite can play an obvious anti dropping effect. According to the different content of the compound components, the OI of the test sample is tested as shown in table 4-37. As can be seen from table 4-37, add
The flame retardant effect of triphenyl phosphate was not good. The second group was added with the complex system of bromine flame retardant and sb2o: and oi increased to 28. Obviously, the best flame retardant effect is the combination of phosphorus, bromine and antimony. There may be a large amount of synergistic effect among them, and the flame retardant effect is obvious. Oi can reach 33.6 and reach UL94V-0 (1.6mm). However, the formulation of adding 10 bromo - silane can produce certain black smoke and there is a drop phenomenon. The addition of sb20 can improve this disadvantage, and has certain smoke effect, and the drop becomes not obvious. The phosphorus inorganic system was introduced in the 6 # and 7 # formulations, aiming at improving the black smoke produced during the combustion of PA66. When TPP, Mg (OH) 2 and nano montmorillonite were added, black smoke was almost invisible when burning. Oi was 6.7, and it also reached UL94V-0 (1.6mm). Melt blown nonwoven production line www.handern.com
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