Epoxy resin (EP) flame retardant

Epoxy resin (EP) flame retardant can be divided into two types: packing type and structural type.

Epoxy resin (EP) flame retardant filler flame retardant, often referred to in the cure reaction of epoxy resin with various don't participate in flame retardant additives, acquire the method of flame retardant performance, also known as the reactive flame retardant methods; Structural flame retardant of epoxy resin (EP) flame retardant refers to the method of introducing flame retardant structure to flame retardant in epoxy resin, also known as reactive flame retardant method.

Epoxy resin (EP) flame retardant 1. The most commonly used method in the flame retardant technology of epoxy resin is the use of packing type flame retardant. Compared with the flame retardant method, it has the characteristics of simple process, low cost, wide source of raw material, convenient operation and flame retardant effect.

The commonly used type of flame retardant of epoxy resin is halide, phosphite, hydrated alumina, calcium aluminate and ammonium polyphosphate. These flame retardants can be used alone to achieve better flame retardant effects. If they are pretreated or used with other flame retardants, the flame retardant effect is better. If red phosphorus is added to epoxy resin, then it is first coated with silane coupling agent or titanium acid, and then with A1 (OH) 3. And the flame retardant effect is better. Whole chlorinated biphenyl and nickel oxide are also good compound flame retardants.

Epoxy resin (EP) flame retardant 2. By the structural characteristics of epoxy resin system of the preparation of flame retardant methods is contained in the epoxy resin molecular structure of the flame retardant elements migration not easily, not easy ooze, excellent and permanent flame retardancy, and good dimensional stability, thermal stability, oxidation stability, hydrolytic stability and high coal rate. Structural flame retardant methods can be divided into four types: [1] the epoxy resin can be prepared directly from the monomer containing flame retardant structure; (2) add flame retardant curing agent; (3) mix with epoxy resin with reactive flame retardant diluent; [4] add reactive flame retardants

For direct preparation of flame retardant epoxy resin monomer usually monomer containing halogen element, as in the polycondensation reaction of epoxy resin containing halogen bisphenol A, then react with epoxy chloropropane, generate halogenated epoxy resin. Table 3 is the formulation of the flame retardant epoxy resin system using bisphenol A and epichlorohydrin. In the table will be raw material reaction after 4 h under 80 ℃, vacuum to remove excess epichlorohydrin, after washing to remove sodium chloride generated, namely the bromine content was 24% of epoxy resin. Then add dicyandiamide and benzyl dimethylamine, mixed with three rolls, to make flame retardant epoxy resin system



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.


With flame retardant curing agent, the cured epoxy resin contains flame retardant structure, so it is flame retardant. The flame retardancy of the epoxy resin curing agent are: two chlorinated maleic anhydride, six methyl chloride in time four hydrogen of benzene anhydride, four bromobenzene anhydride, tetrachlorophthalic anhydride, 80 anhydride, contains amino phosphate and phosphoric acid amide, etc. 80 anhydride curing agent for epoxy resin characteristics can be mixed with epoxy resin at room temperature, the process is simple, low toxicity, good flame retardant performance (oxygen index up to 32), long durability, but also in the medium temperature condition (100 ~ 110 ℃), rapidly solidified.

Add the active flame retardant diluent. ? The commonly used epoxy resin active flame retardant diluents have the flame retardant effect of c dimethyl glycidyl ether, dibromophenyl glycidyl ether and so on

Add reactive flame retardant. Some have the base of the groups such as halogen or phosphorus compounds added to the resin can be involved in the reaction system, introduce the flame retardant elements in the molecular structure of the epoxy resin, making it with good flame retardancy. The commonly used epoxy resin reactive flame retardants are tribromophenol, tetrabromobisphenol A and acid phosphate.
Flame retardant mechanism of epoxy resin. Before the 1970s, the research on the flame retardant theory of epoxy resin was often carried out based on the partial and incomplete evidence obtained in the application research process, so the development was slow. In the last 10 years. With the adoption of advanced scientific instruments and techniques, the research on the flame retardant mechanism of epoxy resin has been gradually developed and systematized

At present, the mechanism of gas phase mechanism and agglomeration phase (including liquid phase and solid phase) of epoxy resin flame retardant mechanism are recognized. The gas phase mechanism includes the free radical capture agent (x· HX, etc.) produced by the decomposition of flame retardants (x, HX, etc.) to capture the active intermediate (H, Ho, etc.) of the combustion reaction. The resulting inert gases (N2, H2O, CO2, etc.) remove the heat transfer oxygen to inhibit or slow the normal combustion reaction.

The condensed phase mechanism includes the carbonization of some materials produced by flame retardant due to phase decomposition, and the pyrolysis of the material is reduced to flammable gas. The resulting solid melt covers the surface of the burner to separate oxygen and extinguish the flame.

The flame retardant synergistic effect is because several flame retardant or flame retardant methods can produce larger flame retardant compounds in combination with the use of flame retardant.

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