Solid added flame retardant

Solid added flame retardant

In rigid polyurethane foam, inorganic flame retardant can be added to improve its flame retardancy. This is a method which has been paid attention to. The most used inorganic compounds are antimony oxide, aluminum hydroxide, ammonium phosphate, ammonium polyphosphate, zinc oxide, sodium silicate, borate, etc. The inorganic flame retardants are generally solid, and more contain halogen or phosphate ester flame retardant composite use, at the same time to be super refine and surface treatment, in order to improve the processing performance, reduce the solid dosage of additive flame retardant, reduce the amount of smoke, foam plastic products performance.

Solid - added flame retardants are added to liquid raw materials and are easy to precipitate, usually before foaming or foaming. When solid flame retardants are added to the combined polyether, it is generally necessary to keep stirring constantly to keep the liquid. The solid additive flame retardant will increase the viscosity of the material and reduce the fluidity of the material, which has a certain negative effect on the foam performance. The finer particles are beneficial to the performance of flame retardant performance, and reduce the adverse effects on the foam property. Table 7-53 the effect of particle size on the properties of polyurethane foam and oxygen index.

Because of the presence of solid particles, some conditions cannot be foamed with mixed head machines. For this purpose a special mixture of mixed solid powder fillers is developed.

When the swelling graphite is added to 10% of the total foam weight and added to the right amount of phosphor flame retardant, the flame retardant of the foam can reach DIN410282. However, graphite will increase the porosity of the hard foam and affect the adiabatic effect.

Ammonium polyphosphate (APP) is a kind of fine white powder flame retardants, powdered APP, the APP in the polyol stable thixotropic dispersions, microcapsule coated APP, the APP and nitrogen association of Exolit form such as a mixture of AP series flame retardant, used for polyurethane hard foam.

The self-extinguishing can be achieved by the introduction of 17% polyphosphate ammonium phosphate in polyurethane foam. The best flame retardant effect can be obtained by using more than 80um particle size. Add 40%, while maintaining the basic physical and mechanical properties, oxygen index of the bubble is close to 40, but at the moment, the hygroscopicity of ammonium polyphosphate is very high, foam components storage, can make the acid value increase, the problem has been done a lot of research, and made some progress.



Tris(2-butoxyethyl)phosphate(TBEP)Use

This Product Is Flame Retardant Plasticizer, Mainly Used For Polyurethane Rubber, Cellulose, Polyvinyl Alcohol And Other Flame Retardant And Plasticized, With Good Low Temperature Characteristics. Use Of Tris(2-butoxyethyl)phosphate(TBEP) For Flame Retardant Plasticizers And Processing Aids For Rubber, Cellulose And Resins. It Is Recommended For Use In Acrylonitrile-Based Rubbers, Cellulose Acetate, Epoxy Resins, Ethylcellulose, Polyvinyl Acetate And Thermoplastic And Thermoset Polyurethane. Phosphobutyrate (TBEP) Is Also Used As A Defoamer (Antifoam Agent) In Coatings, Detergents And Textiles. Has A Good Low Temperature Characteristics. This Product Can Also Be Used For Nitrocellulose, Ethyl Cellulose, Acrylic Plasticizer, Can Make Products With Transparency And Good Resistance To UV Performance.

Chinese Name: Tris(2-butoxyethyl)phosphate

Synonyms: Triethyl Butoxy Phosphate; TBEP; Tributoxyethyl Phosphate; 2-Butoxyethanol Phosphate; Tetrabutoxy Ethyl Phosphorus; Tributoxyethyl Phosphate; Oxy-Ethyl Phosphate; Tributoxy Phosphate; KP-140; TBXP; Tributoxyethyl Phosphate, Plasticizer TBEP

English Name: Phosphoric Acid Tris (2-N-Butoxyethyl) Ester; TBEP; TBXP; Tributoxy Ethyl Phosphate; KP-140; Tris (2-Butoxyethyl) Phosphate

Appearance: Colorless Or Light Yellow Viscous Liquid

Density 1.006

Melting Point -70 OC

Flash Point 223 OC

Moisture% 0.2% MAX

Refractive Index 1.437-1.439

Color (Pt-Co) 50MAX


Red phosphorus can also be used in polyurethane foam flame retardants, such as ExolitRP 652, which is a kind of thixotropic phosphorus dispersion with castor oil. Shanxi Province chemical industry research institute developed the solid flame retardant TU - 1 is the red phosphorus as the core, with the coordinating role of the other non halogen flame retardant compound with a composite flame retardant, appearance is a deep red solid powder, can be used for polyurethane foam products. When the dosage of the foam formula is 9, the oxygen index can reach 26.4%, reaching UL94V 1 0 flame retardant grade. And it has synergistic effects with many kinds of commonly used flame retardants such as TCEP, DMMP and aluminum hydroxide.

Magnesium hydroxide is an environmentally friendly green flame retardant, which is a kind of additive flame retardant with low smoke, non-toxic, energy neutralization and corrosive gas. The flame retardant mechanism is similar to ATH. Compared with ATH, Mg (OH), decomposition temperature is higher than ATH 1 o0-150 ℃, can be used for processing temperature higher than 250 ℃ flame retardant engineering plastics, and also promote the polymer into the role of carbon. However, to achieve certain flame retardant effects, the amount of addition needs to be more than 50%, which has a great impact on the performance of the material. In order to reduce the amount of Mg(OH)2 in the polymer, one method is to modify the Mg(OH)2 particles and the other is to modify the surface of Mg(OH) by the cladding technique to improve its compatibility with the polymer.

PC/ABS alloy has excellent comprehensive performance. Although the PC itself has certain flame retardancy (LOI = 25%), the flame retardant performance declines after mixing with ABS. Flame retardants must be added to meet the application of PC/ABS alloy in electronics, electrical switches and electrical appliances.

Flame retardant PC/ABS alloys commonly used in flame retardants, such as brominated epoxy resin, brominated polycarbonate, brominated polystyrene, decabromodiphenyl; Phosphate flame retardant. Such as TPP, RDP, BAPP; Phosphor bromine structure flame retardant, such as phosphate 3 (2, 4, 1, 4, 1, 2 bromophenyl ester), the product number is KroitePB- 460. Their flame-retardant PC/ABS alloy has its own characteristics.

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