Effect of compound flame retardant on polypropylene

Effect of compound flame retardant on polypropylene

The influence of compound flame retardant on polypropylene was studied by zhang zhonghou. Results show that when the composite flame retardant content is 10%, the ratio of two type expandable graphite and red phosphorus, the mechanical properties of composite materials and flame retardant performance indexes reach the maximum, oxygen index was 23.4%, the tensile strength of 35.9 MPa, the notched impact strength is 0.7 kJ/m2, comprehensive performance is the best.

Li, etc in 3 get together cyanogen chloride, diethanolamine and ethylene diamine as raw material to study the effect of compound flame retardants to polypropylene, design and synthesis of a new type triazine class into carbon agent (CA), with the ammonium polyphosphate, MA flame retardant polypropylene. The results showed that the modified IFR greatly improved the flame retardant performance of polypropylene.

The effect of compound flame retardant on polypropylene showed that when IFR was composed of 80.3% of polyphosphate, 13.0% MA and 6.7% CA, the flame retardant effect of polypropylene was the best. When the added amount of IFR was 30%, the limit oxygen index of flame retardant polypropylene reached 35.5%. When the amount of IFR is only 25%, the flame retardant performance of flame retardant polypropylene can be achieved by the ul-94v-0, and the limit oxygen index reaches 32.5%.

Recently developed a new type of halogen-free flame retardant, expansible graphite can be in the resilience of the carbon layer formed on the surface of polymer material, fuel and heat source is separated, and will be a large amount of heat in the process of expansion, lower the temperature in the system at the same time release the interlining of acid radical ion, promote dehydration carbonization, and combination of free radical chain reaction to interrupt. When the expandable graphite can be used in combination with red phosphorus, ammonium polyphosphate and melamine phosphate, it can produce synergistic effect.



Tris (2-Chloroethyl) Phosphate

There Are Three Industrial Methods: Phosphorus Oxychloride And Chloroethanol Reaction; Phosphorus Trichloride And Chloroethanol Reaction Reoxidation; Phosphorus Oxychloride And Ethylene Oxide Reaction (Industrial Commonly Used Method).

1, Phosphorus Oxychloride And Ethylene Oxide To Sodium Metavanadate As A Catalyst, At 50 ° C Reaction, The Reaction By Neutralization, Washing, Vacuum Dehydration Off The Low Boiling, That Is, The Finished Product. Chlorohydrin Can Also Be Used As Raw Materials, And Phosphorus Oxychloride Or Phosphorus Trichloride Reaction To Produce Tris (2-Chloro Ethyl) Phosphate.

2, 326 Kg Of Phosphorus Oxychloride And 1.0 Kg Of Sodium Metavanadate Into The Reactor. The Nitrogen In The Autoclave Was Driven By Nitrogen, And 650 Kg Of Ethylene Oxide Was Introduced Under Vacuum And Stirred At 45 To 50 ° C For 2 To 3 Hours. Evaporation Of Excess Ethylene Oxide After Alkali Neutralization To Neutral, Washed, Vacuum Dehydrated. Finished Product.

3. Put Phosphorus Oxychloride And Sodium Metaphosphate Into The Reactor. Nitrogen To Drive The Air, In The Vacuum Under The Access To Ethylene Oxide, At 45 ~ 50 ℃ Stirring 2 ~ 3h. Evaporation Of Excess Ethylene Oxide After Alkali Neutralization To Neutral, Washed, Vacuum Dehydrated Finished.

Tris (2-Chloroethyl) Phosphate use

1. Tris (2-Chloroethyl) Phosphate Has Excellent Flame Retardancy, Excellent Resistance To Low Temperature And UV Resistance, The Steam Can Only Be Used At 225 ℃ Above The Direct Ignition Can Be Fired, But The Fire The Source Is Immediately Self-Extinguishing. This Product Is A Flame Retardant Not Only Can Improve The Material Level Of Flame Retardant Materials, But Also Improve The Flame Resistance Of Water Resistance, Acid Resistance, Cold Resistance And Antistatic Properties. Commonly Used In Flame Retardant Nitrocellulose And Acetate Fiber As The Substrate Of Paint Coatings, Unsaturated Polyester, Polyurethane, Acrylic, Phenolic Resin, Can Also Be Used For Soft PVC Plastic Flame Retardant. This Product Is Used For The Amount Of Unsaturated Polyester 10% To 20%, In The Polyurethane Rigid Foam (Flame Retardant Polyether As Raw Material) Can Be About 10% In The Soft PVC Used As Auxiliary Plastic Flame Retardant When The 5% To 10%. Flame Retardants, Uranium, Thorium, Plutonium, Technetium And Other Rare Metal Separation Solvent Or Extractant.

2. This Product Is Widely Used In Chemical Fiber Fabrics, Cellulose Acetate As A Flame Retardant, In Addition To Self-Extinguishing, But Also Improve Water Resistance, Cold Resistance And Antistatic Properties. The General Amount Of 5 To 10 Copies. This Product Is An Excellent Flame Retardant For Synthetic Materials, And Has A Good Role In The Promotion, Widely Used In Cellulose Acetate, Nitrocellulose Varnish, Ethyl Cellulose, Polyvinyl Chloride, Polyvinyl Acetate, Polyurethane, Phenolic Resin , In Addition To Self-Extinguishing Products, But Also Improve The Physical Properties Of Products, Products Feel Soft, Also Known As Oil Additives And Rare Elements Of The Extractant, And Flame Retardant Rubber Conveyor Belt Is The Main Flame Retardant Materials , The General Amount Of Added 5% To 10%.

3. Used As Additive Type Halogenated Phosphate Flame Retardant And Plasticizer. Molecules In Both Phosphorus And Chlorine, Flame Retardant Effect Is Remarkable, Not Volatile And Hydrolysis, Good Stability To Ultraviolet Light. Applicable To Phenolic Resin, Polyvinyl Chloride, Polyvinyl Acetate, Polyurethane And So On. Also Used As Nitrocellulose Coating Flame Retardant, PVC Flame Retardant Plasticizer, Metal Extractant, Gasoline Additives And Polyimide Processing Aids And So On. Can Improve Water Resistance, Weatherability, Cold Resistance, Antistatic Property. Reference Dosage 5% To 20%.


The flame retardant polypropylene composite was prepared by using expansive graphite as the main flame retardant and the MRP as the flame retardant synergetic agent. When the ratio of expandable graphite to MRP is greater than 2, the flame retardant effect is the best. The flame retardant effect was increased by 30%, and the oxygen index was over 28%. Compatilizer maleic anhydride grafted polypropylene (pp - g - MAH) can improve the compatibility between flame retardant and polypropylene, improve the bonding force, improve the quality of carbon layer, increase oxygen index of the material, the dosage of polypropylene - g - MAH was 30%, oxygen index reached 31.4%.

Buster to adopt different processing methods, such as the expandable graphite filled polypropylene composite flame retardant properties and microstructure were studied and discussed the expandable graphite content and particle structure on the properties of polypropylene oxygen index and horizontal burning effect. The results show that the flame retardant properties of composites are not only increased with the increase of the content of the expandable graphite, but also influenced by the structure of the expandable graphite particles. The strong shear effect of the process can destroy the integrity of the expandable graphite particle structure and reduce the flame retardant effect greatly. Therefore, the method of suppressing molding is obviously better than injection molding.

Studies have shown that silicone compounds, both as additives of polymers and as polymer blends, have obvious flame retardant effects. The silicone flame retardant can be divided into two categories: inorganic silicon and organic silicon flame retardant. The inorganic silicon is mainly silica, and the organic silicon is mainly silicone, silicone, silicone rubber and organosilane. Silicone flame retardant has moisture-proof, hydrophobic, electrical insulation, high and low temperature resistance, good chemical stability, excellent performance, and silicone flame retardant flame retardant effect is better than that of the inorganic flame retardants, silicon, good compatibility with polypropylene is the main development direction of silicone flame retardants.

Silicone flame retardant mechanism of flame retardants is organic silicate in the vinyl to make silicon carbide coking isolation layer, prevent the polymer contact with oxygen in the air, inhibits the generation of the release of harmful gas and smoke, so as to achieve flame retardant smoke suppression effect. The organic silicon flame retardant can not only improve the flame retardation of polypropylene, but also improve the mechanical and electrical properties of polypropylene.

For polypropylene, flame retardant containing silicon, do not contain halogen, antimony elements can be similar to the interpenetrating network structure and partly crosslinked polymer and combination, make its not migrate to the surface of material, also can improve the surface smoothness of polypropylene, but don't change other surface performance, for the base material of adhesion sex has no effect. When the content of SFR - 100 was 25%, the flame retardant polypropylene level can reach UL - 94 - v - a level 0, and can maintain the performance of the original base material, to improve its dosage can get special excellent flame retardancy and smoke suppression of polypropylene material.

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