Metal oxide flame retardant

Metal oxide flame retardant mechanism of flame retardants is with halogen elements of flame retardant synergistic effect, and the chlorine mass fraction 56% PVC itself, thus adding metal oxide alone can show the good flame retardant effect.

The flame retardant effect of some metal oxides in PVC was studied by using thermal analysis method. Found that most of the metal oxide (except MgO style, Al2O3, ZrO2 and Cr2O3) when used alone, to have a certain degree of soft PVC flame retardant effect, including better flame retardant effect is Sb2O3, SnO2 and MoO3, in a separate add four cases, the oxygen index of 29.5, 29.5 and 29.1, respectively. In addition, MoO3 and CuO formula were significantly reduced.

According to the part of the physical properties of oxide as you can see, good flame retardant effect of metal oxide flame retardants have a common characteristic, is the general low melting point, such as Sb2O3 is 656 ℃, MoO3 is 795 ℃. The transition metal oxide can also be used as a flame retardant and anti-smoking agent for PVC system. Li bin USES a cone calorimeter (hot flow 50kW? M -2) studied the thermal stability, flame retardancy and smoke suppression of various transition metal oxides (Cu2O, CuO, Fe2O3, MoO3).

It is found that the presence of the transition metal oxide can significantly reduce the heat release rate (HRR) of the material, and the reduction value is directly proportional to the amount of the transition metal oxide. In addition, the Cu2O, CuO, Fe2O3 three can shorten the ignition time of PVC (TTI), in contrast, MoO3 will prolong the ignition time of PVC, on the contrary, MoO3 have reduced the effect of total heat release (THR), PVC Cu2O, CuO and Fe2O3, to little effect. The transition metal oxide can reduce the smoke rate (SPR) and total raw smoke (TSP) in the smoke suppression, but Cu2O and CuO are more efficient than Fe2O3 and MoO3. At the same time, the amount of smoke suppression is proportional to the amount of the transition metal oxide.

At present, the use of SSFR as flame retardant is reported in many patents, but the mechanism of action is not introduced. Tian chunming et al studied the SSFR as a metal oxide flame retardant. When the SSFR of the different ratio was added, the oxygen index of the sample was increased to a different extent from 0.5 to 5 than that of no SSFR.



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%.


Among these three SSFR samples were ZnO/MgO, ZnO/CaO, ZnO/CaO/MgO, and the oxygen index increased by 4.5 ~ 5, which was around 35. In addition, ZnOSSFR was added separately, and the sample oxygen index increased 2.5 to 32.5. Compared with this, the increase of the oxygen index in the sample of MgO, CaO, CaO/MgOSSFR was not obvious.

It is also found that the existence of Sb2O3 can synergistically with various SSFR to promote the improvement of oxygen index. In addition, the effects of the metal oxides on the flame retardancy of the system were compared. After being processed into SSFR, the specific surface area increased a lot of metal oxide, which was dispersed in the system better, the combustion reaction more fully, therefore also got better than ordinary metal oxide flame retardant.

By using thermo-gravimetric analysis the degradation process of sample, find SSFR or ZnO can promote PVC removing HCl as early as possible, got behind in carbon, in the material surface to form a layer of dense honeycomb structure of carbon layer, prevent the spread of heat and oxygen, improve the flame retardancy and smoke suppression materials.

SnO2 and ZHS are considered as a flame retardant for the halogen polymers. In the polymer, the tin compounds show superior performance in increasing the carbon yield. In addition, in the case of high Cl/Sn ratio, the polymer releases a large amount of tin volatiles in the gas phase during combustion, which also ACTS as a barrier to combustion.

Because of its high efficiency, it can replace part of Sb2O3. It is reported that in the case of PVC100, DOP35 and stabilizer, ZHS5 is added to the system, so that the oxygen index can reach the level of adding ATH or MDH30. H. m. j ayne et al. proposed that the use of 2 - price tin or hydroxystannic acid and Sb2O3 for plasticized PVC.

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