Flame retardant mechanism of nitrogen and phosphorus expansive flame retardant

Flame retardant mechanism of nitrogen and phosphorus expansive flame retardant

Flame retardant mechanism of nitrogen and phosphorus expansion flame retardant

(1); This is the main nitrogen and phosphorus expansion type flame retardant flame retardant effect, its mechanism is: at low temperature (about 150 ℃, the concrete temperature depends on the nature of the acid source and other components), by the acid source can release the esterification multivariate alcohol and inorganic acid can be used as dehydrating agent, the temperature is higher than the temperature of the release of acid, inorganic acid esterification with polyol, amine in the catalysts for the system, the esterification reactions. At this point, the system melts before esterification or esterification.
 
And system generated in the water vapor and the non-combustible gases produced by the air supply, such as: the NO and NH3 (heat, the lower the temperature of the material surface, and cut off oxygen into), make the system expansion foam molten state. At the same time polyol and ester dehydrate into carbon, the system further foaming, the reaction near completion, the system gelation and solidification, formed the porous foam carbon layer. For foaming, each step must occur almost simultaneously, but in strict order.

(2) flame retardant; Phosphorus - nitrogen - carbon system of amine compound heat can be decomposed to produce ammonia, water vapor, nitrogen oxides, the former two gases can dilute the oxygen concentration of flame area, which can make the combustion depends on the quenching free radicals and termination of the chain reaction. At the same time, free radicals can also collide with particles forming foam bodies, reacting with each other to generate stable molecules, causing the chain reaction to break down.

Nitrogen and phosphorus expansive flame retardant can be divided into single component nitrogen and phosphorus expansive flame retardant, mixed type nitrogen and phosphorus expansive flame retardant, synergistic or modified nitrogen and phosphorus expansive flame retardant.



Tris (2-Chloroethyl) Phosphate

Appearance: Pure Tris (2-Chloroethyl) Phosphate Is A Colorless Or Pale Yellow Oily Transparent Liquid With A Light Creamy Taste.

Refractive Index (N20D) 1.4731

Boiling Point Of 194 ° C, Flash Point Of 225 ° C

Freezing Point -64 ℃

Decomposition Temperature 240-280 ℃

Viscosity 38-47 Centipoise (20 ° C)

Phosphorus Content Of 10.8%

Chlorine Content Of 37.3%, With The General Organic Solvents (Such As Alcohol, Ketones, Aromatics, Chloroform, Etc.) Compatible, Insoluble In Aliphatic Hydrocarbons, Almost Insoluble In Water, And Hydrolytic Stability Is Good, In Alkaline Solution In A Small Amount Of Decomposition, The No Obvious Corrosion Of The Product.

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%.


One-component nitrogen phosphorus expansion type flame retardant is to acid source, carbon source and gas source on a rally to a large molecules through chemical synthesis method (sometimes only acid source and carbon source of nitrogen and phosphorus expansion type flame retardant), and then added to the material or in the form of melt mixing reaction in combination with its functional groups with the material of group

Expansion type flame retardant can be divided into the ring, cage, the ring of cage three types, can effectively reduce the addition amount, reduce the absorption of moisture resistance, and thermal stability is good, can also with polymer monomer graft copolymerization, very good solution to nitrogen and phosphorus expansion type flame retardant polymer and the incompatibility between the problem.

The world's commoditized single-group nitrogen and phosphorus expansive flame retardants have been developed by us GreatLake company cn-329 (pentaerythritol, triclosan and melamine as raw materials), and Melabis, developed by the borg-warner chemicals company. Domestic Beijing institute of technology, sun yat-sen university, China university of science and technology, Shanghai fire research institute, anhui institute of chemical industry are studied, but domestic single-component of nitrogen and phosphorus of commercialization of expansion type flame retardant is not much, mainly composed of poly phosphoric acid amine type components.

Cn-329 is applicable to PP (PP), which is stable at the processing temperature of PP and has good electrical properties. In addition, the material oxygen index (LOI) can reach 34 and reach non-flammable level when the addition amount is 30%. Therefore, CN-329 is a good flame retardant of PP.

Mixed nitrogen and phosphorus expansion type flame retardant is by the acid source, carbon source and gas source of two or three in the physical form of the mixture of flame retardants and phosphorus and nitrogen as the main composition of flame retardant, does not contain halogen and antimony oxide. Its advantage is the addition quantity is small, do not produce the melting drop, the smoke quantity is small, do not produce harmful and corrosive gas, not easy to rise frost. Downside is that it consists of various components distribution, during which the proportion of extremely complicated, not easy to control, and distribution of hybrid system with easy absorption of moisture, thermal stability, total amount is big, poor compatibility with polymer, shortcomings as well as the uneven distribution of phase behavior and so on.

Zhi-ling ma, such as the phosphorus pentoxide (P2O5) and pentaerythritol (PER) and melamine (MEL) proportionally mixed heating to 130 ~ 220 ℃, heat preservation 3 h get mixed nitrogen and phosphorus expansion type flame retardant, flame retardant for polyolefine, found with nitrogen and phosphorus P2O5 percentage increase in the expansion type flame retardant, polyolefin obviously improve the flame retardancy, mechanical properties increased first, and then decline.


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