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With China Plastic Machinery
With China Plastic Machinery
Modified POM refers to POM DuPont 515GR525GR glass fiber reinforced agent with medium viscosity, high rigidity and high strength.
Reinforced POM, toughened POM, flame retardant POM, wear-resistant POM, weather-resistant POM, oil-resistant POM, hydrolysis-resistant POM, high (low) temperature resistant POM, heat-resistant POM, high viscosity POM, high toughness POM, high stiffness POM, high hardness POM, glass fiber reinforced POM, low warpage POM, low latent POM, fatigue-resistant POM, creep-resistant POM, high flow POM, heat-stable POM, anti-static POM, flexible POM, and other modified products.
Add Teflon POM DuPont 100AF500AF general grade, add 20% TEFLON3 fiber, surface lubrication. Product Features: Similar physical properties to 500, but with ultra-low friction coefficient and high wear resistance.
Acetal polymer, also known as polyoxymethylene, is formed by the polymerization of formaldehyde, and is also often called polyoxymethylene (POM). The preparation of polymers from formaldehyde was studied as early as the 1920s by S. Diegers, but no thermally stable material was obtained until DuPont developed Delftn in 1950. "Homopolymers are prepared by anionic polymerization of very pure formaldehyde. Amines and soluble alkaline metal salts catalyze this reaction. The polymer formed is insoluble and precipitates continuously as the polymerization proceeds. As the formaldehyde is separated, the acetal resin is pulled apart and thermal degradation occurs. The thermal stability of the polymer can be improved by esterification of the terminal hydroxyl groups with acetic anhydride. Another method of improving thermal stability is copolymerization with a second monomer, such as ethylene oxide, and the polymer is prepared by a cationic polymerization process. This process is Celemex, which is sold under the trade name Celeon. Hematafoml, sold by Hoesch, is another copolymer. The presence of a second monomer reduces the tendency of the polymer to degrade by cationic polymerization."
POM has a limiting oxygen index of only 15%, making it a very flammable plastic.
POM, as an engineering plastic, is widely used in the automotive, electrical and electronic, and building materials industries, which have high requirements for flame retardancy. Due to the poor compatibility of POM with other materials, it is difficult to prepare flame-retardant POM with excellent performance by directly adding flame retardants.
A composite flame retardant comprising PURT coated nitrogen-based flame retardant melamine cyanurate (MCA) is used to flame retard POM. The composite flame retardant has good compatibility with POM, which avoids the degradation of material performance caused by direct mixing of the flame retardant with the POM matrix.
When the total mass fraction of PURT/MCA is 30% (the mass fraction of MCA is 21%), the oxygen index of flame retardant POM increases from 15% to 26%; the flame retardancy of MCA on POM is mainly based on heat absorption and cooling. MCA decomposes into melamine, isocyanic acid and decomposition products. The high-temperature sublimation heat absorption of melamine can reduce the combustion temperature; melamine and isocyanic acid further decompose to produce inert gases such as CO2 and NH3, which can dilute the oxygen in the air and the concentration of formaldehyde, a combustible gas produced by the thermal decomposition of POM, and effectively inhibit combustion; and melamine can effectively absorb formaldehyde, improve the thermal oxygen stability of POM, and effectively improve the flame retardant properties of the material. When magnesium hydroxide [Mg(OH)2] and ammonium polyphosphate (APP) are used as flame retardants for POM, the flame retardancy of POM is greatly improved after adding Mg(OH)2. When the mass fraction of Mg(OH)2 is 60%, the limiting oxygen index of the material increases from 15% to 40%, and the horizontal burning speed decreases from 0.33mm/s to 0.31mm/s.
APP has a better flame retardant effect on POM than Mg(OH)2. When the mass fraction of APP reaches 25%, self-extinguishing POM can be obtained.
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