The surface modification
Dalian heqi the caustic calcined magnesite To introduce you to: inorganic flame retardant with strong polarity and hydrophilic, with nonpolar polymer compatibility is poor, difficult to form good combination and adhesive interface. To improve the sticky relay and interface compatibility with polymer, using coupling agent on the surface treatment is one of the effective methods. The commonly used silane and titanate coupling agent is esters. If after the silane treatment of ATH, flame retardant effect is good, can effectively improve the bending strength of polyester and the tensile strength of the epoxy resin; ATH of ethylene coupling agent treatment can be used to improve the flame retardancy of crosslinked ethylene vinyl acetate copolymer, heat resistance and moisture resistance. Ester titanate coupling agent and silane coupling agent can use, can produce synergies. After dealing with the surface modification of ATH surface activity improved, increased the affinity between the resin, improve the physical and mechanical properties of the products, increase the processing fluidity of the resin, reduces the ATH surface moisture absorption rate, improve the flame retardant products of the various electrical properties, and flame retardant effect can be increased from V grade 1 to grade V 0
At present, the ultrafine caustic calcined magnesite to introduce you to the ATH, ultrafine nano is the main direction of research and development. Of ATH add can reduce the mechanical properties of the material, and use of ultrafine, especially nano-sized ATH filled plastics, rigid particles plasticizing enhancement effect. This is due to its role in flame retardant is dominated by a chemical reaction, for the same amount of flame retardant, its the smaller the particle size distribution, specific surface area is big, flame retardant effect is better. , ultrafine, on the other hand, nano ATH, enhanced the interaction interface, can be more evenly dispersed in the matrix resin, more effectively improve the mechanics performance of the blend. As in LDPE/EVA (70/30) filling Solem companies in the United States of the particle size to 10 microns ATH, extrusion capacity can be increased by 40%. Three kinds of new flame retardant technology 3.1 smoke elimination technique titanium oxide and aluminum hydroxide and other compounds.Dalian heqi the caustic calcined magnesite To introduce you to:
Flame retardant chemicals can be divided into two types: caustic calcined magnesite is to introduce you to a kind of additive; One is reactive. Add the type of flame retardant can disperse in plastic matrix, but with polymerization reaction bonding owner key. Reactive additives as comonomer, through polymerization, become a component of the resin. Additive flame retardant Trihydrate alumina (ATH) release when burning, the flame front area to cool. Thermal stability of ATH is limited, to achieve the required flame retardant requirement, must use a lot. But because the material price is low, so in the United States is dosage larger single-component flame retardants. ATH do not produce smoke, non-toxic, therefore, can be used for unsaturated polyester, epoxy resin, polyurethane, as well as some wire and cable. Halogen containing compound price is much higher than that of ATH, but the dosage is not big, can obtain good flame retardant effect. Therefore, using this kind of flame retardant or buy from the cost. Generation polybrominated diphenyl ethers (pbdes ten, eight pbdes) is widely used in this kind of halogen containing compound two kinds. These additives from a cost point of view is economical, suitable for high impact polystyrene (HIPS), ABS and other types of styrene. They are also used in polyester, polyamide and polyolefin in different degree. However, because of their uv stability is not strong, the surface frosting, and has certain influence on the plastic performance (e.g., lower impact strength), so in this kinds of plastic is not widely used. Bromide of phthalic acid ester, whether liquid or solid, are not frost thermal stability of the flame retardant, it can provide the ideal flame retardant effect, and for many different kinds of resin can improve physical performance. Some halogen containing aromatic additives, polymer type (such as brominated polystyrene, polycarbonate bromide). They can't afford to cream. But because of the high price of this kind of additive, so generally used only for high performance engineering plastics. Chlorinated hydrocarbon and hydrocarbon bromide fat fat is used in a variety of plastics, including PE, PVC, polyurethane foam and PP. However, their use is not widespread, because of its low thermal stability, and plasticizing. Six chlorine cyclopentadiene and cyclooctadiene adduct is a relatively stable and not plasticizing varieties, can also be used for styrene plastic and nylon.Dalian heqi the caustic calcined magnesite To introduce you to:.