MGHZ-FD series - magnesium hydroxide flame retardant implementation standard: HG/T3607-2000
1. Characteristics of magnesium hydroxide flame retardant Magnesium hydroxide flame retardant is an inorganic additive type environmentally friendly flame retardant, which has multiple properties such as flame retardant, smoke elimination, drip resistance and filling, and is thermally stable compared with aluminum hydroxide. High-performance, high-efficiency properties such as carbonization and strong acid removal, the magnesium hydroxide flame retardant has the following advantages:
1, safe and non-toxic. The flame retardant itself is non-toxic and does not produce toxic gases when burned. It is both a flame retardant and a smoke suppressant.
2, good physical properties, although the filling amount is required to be large, but does not reduce the rigidity, heat deformation and impact resistance.
3, good formability, large filling, but good forming performance, large TV back cover is also easy to form.
4. The mutual solubility of the polymer is good, and there is no oozing and sublimation phenomenon which is easy to occur with the organic flame retardant.
5, flame retardant and reinforcing is a functional filler.
6. The thermal decomposition temperature of magnesium hydroxide reaches 330 ° C, which is 100 ° C higher than that of aluminum hydroxide, which is beneficial to the improvement of plastic processing temperature, speeding up the extrusion speed and shortening the molding time;
7. Magnesium hydroxide has strong smoke suppression ability, low hardness and low friction to equipment, which helps to prolong the life of production equipment.
Based on the above characteristics, magnesium hydroxide flame retardants are used in polypropylene, polyethylene, polyvinyl chloride, EPDM and unsaturated polyester and paint coatings. It has been widely used in the flame retardant masterbatch, flame retardant cable, tape products, interior decoration materials, belt transmission and other industries are achieving gratifying results, and is constantly expanding its new use. For example, in 100 parts of benzene latex, 53 parts of magnesium hydroxide and aluminum hydroxide are added respectively. When burning, not only the flame retardant effect of magnesium hydroxide is good, but also the ability to reduce the amount of smoke of the material is more prominent than that of aluminum hydroxide. In the olefin and the polyolefin, an appropriate amount of magnesium hydroxide and aluminum hydroxide are respectively added, and when 100 parts of magnesium hydroxide is added, not only the oxygen index is large but also the tensile strength and elongation are compared with the addition of 100 parts of aluminum hydroxide. Also higher. Under the high filling of 100-200PHR, the original performance of polypropylene can be basically maintained. Polypropylene filled with magnesium hydroxide generally has lower tensile strength and impact strength than polypropylene. However, the modified magnesium hydroxide flame retardant has better room temperature impact strength than polypropylene base. There is still much room for research in the form of magnesium hydroxide, especially in the surface treatment technology and the selection of surface agents. A large number of studies and practices have proved that the smaller the magnesium hydroxide particles, the higher the dispersibility and uniformity among the polymer materials, the better the flame retardant properties, and the higher the filling amount, the influence on the processability of the materials. The smaller. Ultrafine grade (above 5000 mesh) magnesium hydroxide does not significantly affect the physical properties of the product even if it is used in a high filling amount. If it is properly modified, it will have a more desirable effect.
Second, the conditions necessary for the use of magnesium hydroxide as a flame retardant
1, must have a higher purity, calcination water loss rate of not less than 30% (can be 600 ° calcination test in high temperature furnace);
2, must have a hexagonal sheet or needle-like microstructure (microscopic observation);
3, must have a very fine particle size (5000 mesh or more) and laser particle size distribution is uniform, because the larger particle size will become the stress concentration point in the composite material, becoming the weak link of the material;
4, must be fully surface modification treatment, so that it has oleophilic water repellency (can be tested in water).
Third, the main physical and chemical indicators of magnesium hydroxide flame retardant
1. Our factory MGHZ-DF, USA, Japan A-1 brand flame retardant magnesium hydroxide enterprise standard comparison project MGHZ-DF American industry standard Japan A-1 brand standard magnesium hydroxide (%) 94-96 ≥95 ≥90.0
Calcium oxide (%) 0.35 ≤ 1.0 ≤ 1.0
Chloride ion (%) 0.20 ≤2.0 ≤3.0
Iron (%) 0.20 does not require no sulfate ion (%) 0.32 is not required ≤ 1.7
Acid insoluble matter (%) 0.45 does not require ≤0.7
Free moisture (%) 0.3-0.8 2.0 ≤3.0
Specific surface area (m2.g-1) 19.8 50-80 No bulk density required (g/ml) 0.32 No requirement for whiteness 85-90 No requirement for laser particle size (D50/μm) 1.80 35-50 Not required Calorific water loss rate (%) 31 No requirement is not required 2. The factory's magnesium hydroxide flame retardant (MGHZ-DF) is chemically produced, has a hexagonal sheet-like microstructure, and has a fine grain size (7000-7500 mesh). The particle size distribution is uniform, the surface is specially modified, and has good oleophilic water repellency. It is well compatible with polymer materials and has high dispersion and uniformity in polymer materials.
Fourth, the application of magnesium hydroxide flame retardant
1. The magnesium hydroxide flame retardant must be thoroughly mixed with the polymer raw materials in proportion. For example, when magnesium oxide is used as a flame retardant to prepare flame retardant PP, in order to uniformly disperse Mg(OH)2 in PP, a high-speed mixer, or a BussKenader, or a twin-screw mixing extruder made in Germany can be used. , or a reciprocating single-screw kneading extruder for mixing, and a reasonable feeding and mixing method. For example, all of the PP and toughening agent can be mixed with the required amount of 60% of Mg(OH)2 for the first time in the mixing and kneading machine for a few minutes, and then the remaining Mg(OH) is added a second time. 2. If mixing with an internal mixer, for Mg(OH)
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