Flame retardant modification method for selecting flame retardant

MGHZ-FD series - magnesium hydroxide flame retardant implementation standards: HG/T3607-2000
I. Characteristics of Magnesium Hydroxide Flame Retardant Magnesium Hydroxide Flame Retardant is an inorganic additive-type environmental protection flame retardant. It is a fire-retardant, smoke-reducing, drip-proof, and filling multi-layer. It has thermal stability compared to aluminum hydroxide. High-performance, high-efficiency carbon-promoting and strong acid-removing ability, 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 it is burned. It is both a flame retardant and a smoke suppressant.
2, good physical properties, although the filling requirements are large, but does not reduce the rigidity, heat deformation and impact resistance.
3, good formability, although the filling amount is large, but the forming performance is good, large-sized TV back cover is also easy to form.
4. The mutual solubility of the polymer is good, and there is no phenomenon of exudation and sublimation of organic flame retardants.
5. Both flame retardant and reinforcing properties are functional fillers.
6, magnesium hydroxide thermal decomposition temperature of 330 °C, higher than aluminum hydroxide 100 °C, it is conducive to the plastic processing temperature, speed up the extrusion speed, shorten the molding time;
7. Magnesium hydroxide has strong smoke suppression ability, low hardness, and low friction on equipment, which helps to prolong the life of production equipment.
Based on the above characteristics, in today's increasingly stringent global environmental protection requirements, magnesium hydroxide flame retardants in polypropylene, polyethylene, polyvinyl chloride, ethylene propylene diene monomer (EPDM) and unsaturated polyester and paint coatings and other polymer materials It has been widely used, and it is making promising achievements in flame-retardant masterbatch, flame-retardant cables, tape products, interior decoration materials, and belt transmission industries, and is constantly expanding its new uses. For example, in 100 parts of benzene latex, 53 parts of magnesium hydroxide and aluminum hydroxide were added respectively, and not only magnesium hydroxide but also the ability to reduce the amount of smoke emitted from the material was more prominent than that of aluminum hydroxide when burned. In the olefins and polyolefins, appropriate amounts of magnesium hydroxide and aluminum hydroxide are respectively added. When 100 parts of magnesium hydroxide are added, the oxygen index is not only larger than that of 100 parts of aluminum hydroxide, but also the tensile strength and the elongation are increased. Also higher. In the 100-200PHR high filling can still maintain the original properties of polypropylene. The polypropylene generally filled with magnesium hydroxide has poorer tensile strength and impact strength than polypropylene. However, the modified magnesium hydroxide flame retardant has superior room temperature impact strength and is superior to polypropylene base material. In the form of magnesium hydroxide, especially in the surface treatment technology, the choice of surface agent still has great room for research. A large number of researches and researches show that the smaller the magnesium hydroxide particles are, the higher the dispersibility and uniformity among the polymer materials, the better the flame retardant performance, and the processability of the material when the filler content is high. The smaller the impact. The use of ultra-fine grade (above 5,000 mesh) magnesium hydroxide, even when used at high levels, does not affect the physical properties of the product drastically. If it is properly modified, it will have a better effect.
Second, magnesium hydroxide as a flame retardant must use the conditions
1, must have a high purity, calcination water loss rate of not less than 30% (can be calcined in a high temperature furnace 600 degrees inspection);
2. Must have hexagonal sheet or needle microstructure (microscopic observation);
3, must have a very fine particle size (above 5,000 mesh) and the laser particle size distribution is even, because the larger particle size will become the stress concentration point in the composite material and become the weak link of the material;
4, must be fully surface modification treatment, so that it has a lipophilic hydrophobicity (agitated in water test).
Third, the main physical and chemical indicators of magnesium hydroxide flame retardant
1. Our company MGHZ-DF, the United States, Japan A-1 flame-retardant magnesium hydroxide enterprise standard comparison project MGHZ-DF US 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 Not required Not required Sulfate ion (%) 0.32 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 Bulk density not required (g/ml) 0.32 Not required Undesired whiteness 85-90 Not required Not required Laser particle size (D50/μm) 1.80 35-50 Not required Calcined water loss rate (%) 31 Not required Not required 2, the factory magnesium hydroxide flame retardant (MGHZ-DF) is chemical production, with a hexagonal sheet-like microstructure, fine granularity (7000-7500 mesh), The particle size distribution is even and the surface has been specially modified. It has good oleophilic and hydrophobic properties, is well compatible with polymer materials, and has high dispersion and uniformity among polymer materials.

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