Flame retardants to meet the development of The Times need to change the industrial structure

Halogenated flame retardants account for about 70% of all flame retardants in China. Under the impact of eu double directive and REACH regulation, the current industrial structure should be changed.

1. Chlorinated paraffin

The production process of chlorinated paraffin-70 is backward carbon tetrachloride method, which should be eliminated as soon as possible.Because of toxicity and environmental concerns, industries in Europe and the United States have banned the use of chlorine-containing flame retardants.

2. Bromine flame retardant

No compound in the world has undergone as much testing and evaluation as decabromodiphenyl ether (DBDPO).Over 10 years, 588 trials were carried out at a cost of 8 million euros.Results no harm was found in production, manufacture, storage, transportation and use.The eu therefore decided on 15 October 2005 to allow the use of DBDPO in polymers in the RoHS directive.The decision is based on a decade-long eu risk assessment of the environment and human health, industry consultation and the voluntary action plan (VECAP) on emission control proposed by the DBDPO production and use industry.The production of DBDPO is required to increase the purity to or above, and the incomplete bromination should be controlled as much as possible in ninobromodiphenyl ether, and the component of octabromodiphenyl ether should be reduced to comply with the corresponding instructions and regulations.The author believes that bromine flame retardants will still have strong vitality, its superiority is no other flame retardants can replace.As A relatively new type of brominated flame retardants are decabromodiphenyl ethane, brominated epoxy resin, brominated polystyrene, polybrominated styrene, tetrabrominated bisphenol A carbonate oligomer, etc.

(1) decabromodiphenyl ethane can be used wherever DBDPO can be used because it has the same bromine content and relative molecular mass as DBDPO.

(2) brominated epoxy resin is divided into two types: low relative molecular mass and high relative molecular mass. No matter which one is, compared with other flame retardants, it has the characteristics of high relative molecular mass, high brominated content and good compatibility with high polymer. Therefore, the usage is increasing year by year.

(3) brominated polystyrene is an additive flame retardant of high molecular bromine, which has good compatibility with PA and other high polymers, and has little influence on the physical properties and mechanical properties of the retarded substrates.Brominated polystyrene with low molecular weight has better fluidity and compatibility.

(4) polybrominated styrene is a polymer of brominated styrene, which can improve the compatibility between the copolymer and some resins, so as to improve the heat resistance and fluidity of the flame retardant material, and prevent foaming of the material.

(5) tetrabromobisphenol A carbonate oligomers are additive aromatic bromine flame retardants, mainly used for flame retardant abs, PBT, PET, PC, PC/ abs blends, polysulfone, PET/PBT blends and SAN, etc.Brominated carbonate oligomer is a good flame retardant for enhanced and unenhanced PBT, which has the color, impact strength, fluidity and thermal stability of the raw material.

3. Organophosphorus flame retardant

Phosphorus flame retardant is a promising flame retardant with abundant resources, low cost and wide application.DMMP has the advantages of colorless, transparent, low toxicity, wide application and low cost, and can be used in PU foam, UP, EP, etc.Phosphorus-containing flame retardants for flame retardant, plasticizing dual function and valued, it includes phosphate ester, phosphate, containing halogen, compound phosphate and its derivatives, phosphate and red phosphorus five types, phosphorus amine, reactive phosphorus compounds, especially phosphorus and nitrogen expansion type flame retardant agent and flame retardant polymer is very promising flame retardants.4. Silicone flame retardant

Organosilicone flame retardants are high polymer compounds, our country has several ten thousand tons of equipment, there are conditions for the development of high polymer organosilicone flame retardants.

5. Inorganic flame retardant

Antimony flame retardants are mainly antimony trioxide and antimony pentoxide.The addition amount can be reduced by microning, nanometer and microencapsulation.

Aluminum, magnesium flame retardants are environmental products, the main varieties of aluminum hydroxide and magnesium hydroxide, in addition to flame retardants can also reduce toxic gas and smoke, but the disadvantage is that the amount of added, but by the coupling agent

After the treatment of the table can play a flame retardant and filling dual functions, and give products electrical properties, heat, weather and mechanical properties, so it is worthy of development.In particular, magnesium hydroxide is a rapidly developing species.The surface is reinforced and modified to further improve the flame retardancy.

Red phosphor microencapsulation and red phosphor/expanded graphite are both worthy of development, and the production capacity has been formed.

The synthesis and development of borate flame retardant should be enhanced to improve its hydrolysis resistance and compound technology.