The purpose of fire-retardant technology is to make non-flame retardant materials with flame retardant properties, under certain conditions, not easy to burn or self-extinguishing, is to provide a security material. The future direction of the development of flame retardants is fire-retardant effect is good, more environmentally friendly security. To this end a considerable amount of manpower and resources for flame retardant new technology research and development. Now, it has also developed several new flame-retardant technology. Xiaobian next to introduce a number of new environmentally friendly flame retardant flame retardant technology.
First, the surface modification
Inorganic flame retardant has strong polarity and hydrophilic, with non-polar polymer material compatibility is poor, the interface is difficult to form a good combination and bonding. In order to improve its adhesion with the polymer and the interface affinity, the use of coupling agent for its surface treatment is one of the most effective way. Commonly used coupling agents are silanes and titanates. Such as silane treated ATH flame retardant effect, can effectively improve the bending strength of polyester and epoxy resin tensile strength; ethylene-silane-treated A TH can be used to improve the cross-linked ethylene vinyl acetate copolymer resistance Flammability, heat resistance and moisture resistance. The titanate-based coupling agent and the silane coupling agent may be used in combination to produce a synergistic effect. After surface modification, the surface activity of ATH was improved, the affinity between resin and resin was improved, the physical and mechanical properties of the product were improved, the processing fluidity of the resin was increased, the moisture absorption rate of A TH surface was decreased, Retardant products of various electrical properties, and flame-retardant effect from V21 level to V20 level.
Inorganic flame retardants have the advantages of high stability, low volatility, low smoke toxicity and low cost, and are more and more popular. But its compatibility with synthetic materials is poor, large amount of added, making the mechanical properties of materials and heat resistance are reduced. Therefore, the modification of inorganic flame retardants, and enhance its compatibility with synthetic materials, reduce the amount of inorganic flame retardants become one of the trends. At present, the aluminum hydroxide (3 Al (OH)) ultrafine, nanocrystallization is the main research and development direction. 3 OH (OH) can reduce the mechanical properties of the material, and the filling of 3 Al (OH) will be plasticization and reinforcement of the rigid particles, especially the nano-scale materials. As the role of flame retardancy is controlled by the chemical reaction, and the same amount of flame retardant its smaller particle size, the greater the specific surface area, the better the flame retardant effect. Ultrafine is also considered from the affinity side. It is precisely because of the different polarity of aluminum hydroxide and polymer, which leads to its physical and mechanical properties of flame retardant composite materials decreased. The micro – nano – sized 3 Al (OH) enhances the interfacial interaction and disperses uniformly in the matrix resin, which improves the mechanical properties of the blend more effectively.
TEP Chinese name: triethyl phosphate
English name: Triethyl phosphate
Traits: colorless transparent liquid
Chromaticity (APHA): ≤ 20
Content (GC%): ≥ 99.5%
Acid value (mgKOH / g): ≤0.05
Specific gravity (20 ° C / 4 ° C): 1.069-1.073
Refractive index (nD20): 1.4050-1.4070
Raw materials: phosphorus oxychloride and ethanol-based, two-step esterification synthesis.
Triethyl phosphate Packing: Net weight 200KG / galvanized iron drum (a small cabinet to fight loaded with 16 tons), 1000KG / IB barrels (18 tons a small cabinet) or 23 tons ISOTANK.
Triethyl phosphate is a high boiling point solvent, rubber and plastic plasticizer, catalyst, also used as raw material for pesticide pesticide preparation, used as ethylation reagent for ketene production.
(1) Catalyst: xylene isomer catalyst; olefin polymerization catalyst; catalyst for manufacturing tetraethyl lead; catalyst for carbodiimide production; catalyst for displacement reaction of trialkyl boron and olefin; ethylene production by high temperature dehydration with acetic acid Ketone; a catalyst for polymerization of styrene with a conjugated diene compound; and when used in the polymerization of terephthalic acid and ethylene glycol, the action of preventing discoloration of the fiber.
(2) Solvent: solvent for cellulose nitrate and cellulose acetate; solvent for maintaining the life of the organic peroxide catalyst; solvent for dispersing vinyl fluoride; peroxide agent for curing catalyst of polyester resin and epoxy resin And diluents.
(3) stabilizer: chlorine insecticides and stabilizers; phenolic resin stabilizer; sugar alcohol resin solid.
(4) synthetic resin: xylenol formaldehyde resin curing agent; shell mold used in phenolic resin softener; vinyl chloride softener; vinyl acetate polymer plasticizer; polyester resin flame retardant .
(5) Triethyl phosphate (flame retardant TEP) for the high boiling point solvent, rubber and plastic plasticizer, pesticide pesticides used for the preparation of raw materials for ethylation agent and ketene production. In Japan, 70% of the product for the catalyst.
Third, complex coordination
In the actual production applications, a single flame retardant there is always the defect of one kind or another, and the use of a single flame retardant is difficult to meet increasingly high demand. Combinations of flame retardants in the phosphorus, halogen, nitrogen and inorganic flame retardants, or within certain types of complex, seeking the best economic and social benefits. Combining the advantages of two or more kinds of flame retardants, the flame retardant compound technology can complement the performance of flame retardants, reduce the amount of flame retardants, and improve the flame retardancy, processing properties and physical and mechanical properties. Flame retardant new technical knowledge universal triethyl phosphate | flame retardants TEP
The flame retardant properties of cross-linked polymers are much better than those of linear polymers. In the thermoplastic processing add a small amount of crosslinking agent, can make plastic into part of the network structure, can improve the dispersion of flame retardants, plastic combustion is conducive to produce carbon effect, improve the flame retardant properties, and can increase the products Mechanical, heat and other properties.
The application of microencapsulation in flame retardants is a new technology developed in recent years. The essence of microencapsulation is to disperse the flame retardants into microparticles, encapsulate them with organic or inorganic substances, form microcapsule flame retardants, or adsorb the flame retardants on the surface of inorganic substances as the carrier. And the honeycomb microcapsule flame retardant is formed. The microencapsulation of brominated flame retardants has the following advantages: improving the stability of the flame retardant, improving the compatibility of the flame retardant and the resin, improving the physical and mechanical properties of the material, Flame retardant of a variety of properties, expand its scope of application.
Sixth, nano-fire-retardant technology
Some nanomaterials have the function of preventing combustion. They can be added into the combustible materials as flame retardants. With their special size and structure effect, the combustibility of combustible materials can be changed to make them fireproof materials. The use of nano-technology can change the flame-retardant mechanism to improve the flame-retardant properties. Due to the small particle size and large specific surface area of the nanoparticles, the surface effect, the volume effect, the quantum size effect and the macroscopic quantum tunneling effect of the nanoparticles have provided a new method for designing and preparing new materials with high performance and versatility. Ideas and ways.