Organic addition of flame retardant

Organic addition of flame retardant

Commonly used organic additive flame retardants is phosphorus, bromine, chlorine and nitrogen flame retardant elements of organic compounds, especially the department of organophosphorus compounds is widely applied in the area of PUF flame retardant research a kind of flame retardant. They have the advantages of high flame retardant efficiency, low viscosity, good compatibility with polyether polyol, moderate thermal stability and anti-coking.

The halogen flame retardants in organic additives mainly include the chlorine and bromine. The flame retardant of bromine is one of the largest flame retardants in the world due to its low dosage, high thermal stability and high flame retardant efficiency. HX halogenated halogenated HX is decomposed by the halogen flame retardant.

The halogen flame retardant is gradually eliminated, and one is the free radical mechanism, which consumes the free radical HO produced by the polymer degradation, so as to reduce the concentration of the free radicals so as to delay or interrupt the combustion chain reaction. Second, surface mechanism, halide hydrogen gas is a kind of flame retardant, density than air, can be formed in the polymer surface barrier, combustible gas concentration to drop, which slows combustion and even that the flame is extinguished. The following is the latest research on the synergistic system of halogen flame retardants.

Organic additive flame retardant is a solid flame retardant and liquid flame retardant. As solid flame retardant increases the viscosity of materials, liquid flame retardants reduce the material viscosity. The combination of the two can adjust the viscosity of the reaction material and get the high flame retardant PUF.

The main purpose of packing reinforced RPU is to improve the elastic modulus, dimension stability and heat resistance of the material, and reduce the shrinkage rate of products in molding process. Because the main raw materials of polyurethane are high, the cost can be reduced after adding filler. Although there are many advantages to using packing, the biggest disadvantage of RPU is that it reduces its impact energy.



Triphenyl Phosphate (TPP)

Retardants tpp quality standards:

Appearance: white flaky crystal

Content : ≥ 99%;

Acid value (mgKOH / g): ≤ 0.1;

Free phenol : ≤ 0.1%;

Freezing point : ≥ 47.0 ℃

Chromaticity (APHA): ≤ 60;

Moisture : ≤ 0.1%

Density (50 ℃, g/cm3) :1.185-1 .202

Retardants tpp Packing: NW 25KG / composite paper ( lined with black plastic bags ) , a small cabinet loaded 12.5 tons .

Flame retardant TPP has many advantages, such as excellent transparency, softness, bacterial resistance, and water proof, grease-proof, good electric insulation, as well as good compatibility. Flame retardant TPP is mainly used as the flame-retardant plasticizer for cellulose resin, vinyl resin, natural rubber and synthetic rubber. And it may also be used as the flame-retardant plasticizer for glyceryl triacetate thin ester and film, rigid polyurethane foam, phenolic aldehyde resin, and PPO, etc.

Flame retardant TPP is a kind of halogen-free environment-friendly flame retardant with phosphorus element. Most of the products in the market are self-colored flaky crystal, our product is self-colored crystalline powder, and is more soluble in organic solvents. TPP is not soluble in water, but soluble in benzene, chloroform, ether and acetone, and slightly soluble in Z alcohol. Flame retardant TPP is nonflammable with slight aromatic odor and slight deliquescence. The fusion point is about 50 ℃, and fast melts to hoop-shape when heated. The lubricate effect is excellent, and it is often used as the flame retardant plasticize lubricant. What is more, it is used as the flame retardant for many plastics and resins, such as phenolic aldehyde resin, epoxy resin and so on.


From the point of packing development history, glass fiber, and hollow glass beads is always the main research object of reinforced polyurethane system, its reason lies in the glass fiber and hollow glass beads on the improvement of modulus is very clear. But after adding glass fiber to make the processing performance, such as adding the mass fraction of 30% or so, the length is 1. 5 mm cut short glass fiber glass, the viscosity of the system is also adding amount, particle size is 100 PM mica filler 50 times. Hollow glass beads and processing performance is good, can improve the comprehensive mechanical properties of RPU, but its effect on foam enhanced than rely mainly on the characteristics of high modulus and hollow glass beads in the polyurethane elastomer system enhancement effect is not obvious, its size if further reduced, not only hard to craft, but also lower than the modulus, so the development potential is limited.

The adhesion of composite material surface with coupling agent to improve the interface has been widely used. The glass fiber must be treated surface before making glass fiber reinforced plastic. Otherwise, the preparation of glass fiber reinforced plastic is easy to stratify. Surface treatment of glass fiber surface is usually treated with coupling agent. Coupling agent can not only improve the interface adhesion of composites, but also have remarkable effect on the performance and mechanical properties of the wet environment.

It is a class of substances with two functional groups with different properties, the molecules can react with polymers is a part of the organic functional groups, another part of the functional group and mineral surface has good reactivity, form a strong adhesive. Coupling agent on the role of composite materials is that it between reinforcing materials and resin matrix in the formation of an interface layer, interface layer can pass stress, so as to enhance the bonding strength between reinforcing materials and resin matrix, which improves the performance of composite material, at the same time can also prevent other medium to permeate interface, improved the interface state, is advantageous to the products resistance to aging, stress and electric insulation performance.

Titanate coupling agent mechanism is more complicated, people have made considerable research, has proposed the theory of monolayer, chemical bonding theory, infiltrating effect and surface energy theory and other theories, but so far there is no complete and unified cognition.

Silane coupling agent is the earliest and earliest coupling agent. The general formula of silane coupling agent is RnSiX (4-n).
This experiment was modified by KH550. The molecules contain two different active groups - amino and oxygen-based, which can be used to double organic polymer and inorganic fillers to enhance their bond and improve product performance. Used for glass fiber, casting, textile aid.

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