How to solve the flame retardant treatment of PBT and PET engineering plastics
Flame retardant PBT and pet (linear polyester) are two important engineering plastics, which are widely used in electronics, appearance and automotive industry. Its flame retardant products are used in components with high flame retardant requirements. Their flame retardant treatment is as follows:
Adding bromine flame retardant
Commonly used are decabromodiphenyl ether, brominated polystyrene (BPS), brominated epoxy resin (BER), bis (tribromophenoxy) ethane, etc.
For example, adding 10%-15% bromine flame retardant and 3%-5% antimony trioxide can make PBT containing 30% glass fiber reach UL94 V-0 level, and the oxygen index can reach 27%-29%. When using additive flame retardants, attention must be paid to the dispersion in PBT and pet, the easy exudation, and the influence on the gloss and mechanical strength of polyester.
Adding brominated phosphate
Tri (dibromophenyl) phosphate (tdbppe) is commonly used. Because BR and P elements are contained in the same molecule, it has halogen phosphorus synergistic effect. Flame retardant efficiency is very high in PBT and pet.
It should be noted that it is often added in the flame retardant treatment; Antimony trioxide is synergistic. If the oxygen index test is conducted, the limiting oxygen index will be added. However, in the oxygen rich test environment, Sb and P seem to have an antagonistic effect. Therefore, the UL94 direct combustion method is the most suitable to evaluate the flame retardant function of the system.
Flame retardant PET as flame retardant fiber and fabric
Generally, there are two methods: one is to use hexabromocyclododecane for flame retardant post-treatment of PET fabrics. This kind of fabric can be used as window curtain, curtain, wall covering and other indoor decorative fabrics. As it is treated by post cleaning method, the flame retardant is easy to seep out, and the fabric feel and flame retardant durability will be worse.
The other is flame retardant modification by copolymerization These reactive flame retardant monomers are mainly brominated aromatic compounds, aryl phosphine oxide compounds, brominated aromatic phosphine oxide compounds, etc. As the flame retardant element becomes a part of the molecular center of oligomer, it has the advantages of durable flame retardant effect, good hand feel and light resistance. It is the main flame retardant method for pet flame retardant fibers and fabrics in China.
Article source: PBT engineering plastics http://www.hhaifeng88.cn/
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