FIRE RETARDANT AND METHOD OF PRODUCTION THEREOF Russian patent published in 2009 - IPC C07F9/40 C09K21/12 

FIELD: chemistry.

SUBSTANCE: invention refers to fire retardant based on mixed hydroxyethylated tetramethylphosphonylpentaerithrite and methylphosphonic acid ethers and applied in aircraft industry as additive to polymer honeycombs and composite materials thus decreasing combustibility thereof. Offered fire retardant is characterised by production method and physical and chemical properties. Method of offered fire retardant production interaction of dimethylphosphonate and methylphosphonic acid dichloranhydride with pentaerithrite. Prepared mixture is trated with ethylene oxide. Stages of production method can include application of water or hydrochloric acid solution. All components of reaction mixture are taken in specified molar ratio at certain temperature conditions. Produced fire retardant is liquid of dynamic viscosity 270.0-280.0 centipoise at 75°C. Phosphorus mass fraction is 15.8-16.2%. Volatile mass fraction is 1.2-2.0%. Alcohol hydroxyl OH-group content is 10.8-11.4 %. Acid value is 1.0-2.0 mg KOH per for 1 g.

EFFECT: production of new effective additive to polymer honeycombs and composite materials thus decreasing combustibility thereof.

1 cl, 3 ex, 1 tbl