Halogen-free flame retardant and method for preparing same
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A flame retardant and structural formula technology, applied in the field of halogen-free flame retardants and their preparation, can solve problems such as easy ignition, toxic hydrogen bromide gas, and molten droplets, so as to improve flame retardant performance and thermal stability , high thermal stability
Inactive Publication Date: 2013-03-13
ZHANGJIAGANG SHUNCHANG CHEM
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However, polyethylene is a high polymer with a hydrocarbon structure, which has poor flame resistance, is easy to catch fire and has molten droplets, and the limiting oxygen index of polyethylene is only 17.6%, which limits the application of polyethylene in some fields. Ethylene for flame retardant treatment
In the prior art, brominated p
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Embodiment 1
[0016] Add 3mol melamine into a three-necked flask filled with deionized water, heat up to 85-90°C under stirring, then add 4.8mol phosphoric acid at a rate of 1-2 drops / second, keep warm for 2.5 hours after the dropwise addition, and then cool to At room temperature, wash with deionized water 8 times, vacuum filter, and dry at 100°C for 4 hours to obtain MP2.92mol, the reaction yield is over 97.3%, and the purity of MP is 96.1%.
[0017] Place 2.92molMP in a muffle furnace, calcinate at 300-320°C for 5h, and grind to obtain 2.90molMPP as a white powder.
[0018] Put 2.90mol of MPP in a muffle furnace, add 0.7mol of melamine and 0.26mol of rare earth metal chloride, calcinate at 300-320°C for 3 hours, and grind to obtain white powder MMPP. Add 10% MMPP to polyethylene, and the oxygen index of polyethylene is from 17.6% to 22.56% of pure PE.
Embodiment 2
[0020] Add 1.5mol melamine to a three-necked flask filled with deionized water, heat up to 90-95°C under stirring, then add 2.3mol phosphoric acid at a rate of 1-3 drops / second, keep the temperature for 2 hours after the dropwise addition, and then cool to At room temperature, wash 6 times with deionized water, vacuum filter, and dry at 100°C for 4 hours to obtain MP1.44mol, the reaction yield is more than 96%, and the purity of MP is 95.4%.
[0021] Place 1.44molMP in a muffle furnace, calcinate at 300-310°C for 4h, and grind to obtain 1.41molMPP as a white powder.
[0022] Put 1.41mol MPP in a muffle furnace, add 0.31mol melamine and 0.096mol rare earth metal chloride, calcinate at 300-320°C for 2 hours, and grind to obtain white powder MMPP. Add 10% MMPP to polyethylene, and the oxygen index of polyethylene is from 17.6% to 21.56% of pure PE.
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Abstract
The invention discloses a halogen-free flame retardant. The halogen-free flame retardant has a structural formula as follows, wherein M is rare earth element series of lanthanum, cerium or praseodymium; and n2 is an integer from 1 to 4. A method for preparing the halogen-free flame retardant comprises the following steps: 1, synthesizing melamine phosphate; 2, carrying out polycondensation on the melamine phosphate (MP) to form melamine pyrophosphate (MPP); and 3, carrying out end sealing reaction to synthesize metal melamine pyrophosphate (MMPP). A rear earth metal chloride end sealing group is added during the polycondensation of the product, as rare earth elements have unique valence shell structures and physicochemical properties, coordination bonding is realized except chemical bonding, the thermal stability of MMPP is increased, and after the MMPP is mixed with polyvinyl plastics, the flame retardant property of the polyvinyl plastics can be greatly improved. The MMPP does not contain halogen, has high thermal stability and does not generate toxic hydrogen halide gas easily.
Description
technical field [0001] The invention relates to the technical field of flame retardants, in particular to a halogen-free flame retardant and a preparation method thereof. Background technique [0002] Polyethylene is light, non-toxic, has excellent electrical insulation properties and corrosion resistance, and is cheap, and is widely used in packaging materials, films, building materials, pipes, wires and cables, etc. However, polyethylene is a high polymer with a hydrocarbon structure, which has poor flame resistance, is easy to catch fire and has molten droplets, and the limiting oxygen index of polyethylene is only 17.6%, which limits the application of polyethylene in some fields. Ethylene for flame retardant treatment. In the prior art, brominated phosphorus-based flame retardants are mainly used to enhance the flame retardancy of polyethylene. Although the flame-retardant effect is better, when the brominated phosphorus-based flame retardants are exposed to high tempe...
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