Improvement of production process of flame retardant agent

Improvement of production process of flame retardant agent

(1) acid source. An important use of the APP (polyphosphate) is as an acid source for the expansion of the flame retardant system. It is an inorganic polymer. The short chain APP is water-soluble, while the long chain APP is insoluble in water. The temperature resistance of the APP with high degree of polymerization will be improved obviously.

Therefore, increasing the aggregation degree of APP can help reduce its decomposition and increase its effectiveness in the flame retardant system. Use of melamine (MEL) can improve the water sensitivity and moisture absorption of the APP. At present, the modified APP introduced by German technology production in hangzhou, China, has a high degree of polymerization, good water resistance and excellent performance.

The long chain APP is a polycrystalline substance. In 1969, American scholar Shen et al. specifically proposed five different types of crystals, and suggested that different methods could be used to prepare them. APP flame retardants are mainly I2 and II2 structures, and their properties are different due to their structural differences.

LuoJieYu from spectral spectrum diagram, such as thermal stability, flame retardant performance, surface structure and analyze the water sensitivity aspects come to the conclusion: type II2 APP flame retardancy is better than that of I2 type structure, and the smoke density is lower than I2 type structure; The processing performance of II2 structure APP is superior to that of I2 structure.

Improvement of production process of flame retardant (2) carbon source. PER (pentaerythritol) is a kind of important carbon agent, has a very wide range of USES, and commercially available PER its grain is bigger, impact on the physical and mechanical properties of materials is very large, limiting its content. Therefore, decreasing the size of PER's particle size can be very helpful to the improvement of flame retardant performance. It can be used to replace pentaerythritol with a wide range of cheap hydroxyl compounds, or PA6 and nitrogen resins. It is helpful for the system to form the carbon foam layer of connected structure under the joint action of dehydrating agent and foaming agent.

In the presence of APP, aliphatic polyamide in thermal decomposition at the same time have a certain effect into charcoal, over-packaging and PA6 into charcoal effect best [12], so many scholars in the research system, the expansion will use PA6 as into carbon agent, when using it made less than 120 mesh is added into PP and PA6 in APP + expansion system of quality accounted for 1/7 of the best flame retardant effect.

The improvement of the production process of flame retardant is the modification of acid source, especially the modification of the APP. The inherent weakness of the APP is [14] : the moisture absorption capacity is greater than that of other organic flame retardants; Poor compatibility and dispersion; The flame retardant durability is not good.



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%.


Therefore, the modification of the APP can be divided into two categories:

(1) modifying the surface of the APP particles with various surface treatment agents. A surface treating agent that adhered to or adsorbed a thin layer of surface after treatment. After treatment, it can improve the compatibility of organic materials to a certain extent, which is more easily dispersed in the material, but it is not enough to completely solve the moisture absorption, water solubility and hydrolysis of the materials.

(2) microencapsulation of the particle surface of the APP is divided into shell and reactive type.

The modified polyphosphate ammonium polyphosphate (MPPA) was obtained by using melamine modified polyphosphate (MPPA), and the effect of adding a carbon agent PA6 to the expansion flame retardant PP of MPPA was good.

A flame retardant is an industrial agent that makes the polymer less prone to fire and burn. In many varieties of flame retardant agents, halogen flame retardants have been widely used for their excellent flame retardant effect and no influence on material properties. However, the polymer with halogen flame retardant can be used to emit corrosive gases (such as HCl, HBr, etc.) and harmful gases, which can cause secondary damage.

Therefore, the research of flame retardants in the world is developing in a non-halogenated direction. The application of aluminum hydroxide, magnesium hydroxide flame retardant is rely on chemical decomposition heat absorption and release water and flame retardant effect, with non-toxic, no corrosion processing machinery, aluminum oxide, magnesium oxide generated after decomposition stable chemical properties, so do not produce secondary hazards.

As the fire accident occur frequently, and the resulting significant personnel and property losses, our country has stipulated in subways and other important buildings must be halogen free flame retardant wire and cable used in wire and cable, and with the people environmental protection and their own safety consciousness unceasing enhancement, polymer material of halogen free flame retardant is known as development direction in the future.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

http://www.yaruichem.com