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A compound flame retardant and flame retardant technology, which is applied in the direction of fireproof coatings, paper, etc., can solve the problems of complex production process, difficulty in realizing industrial production, and low yield, and achieve the effect of simple process
Inactive Publication Date: 2006-07-26
朱凯琴
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Problems solved by technology
However, when applying the method provided by CN 1059945A to produce ammonium pyrophosphate, not only the production process is complicated, but also the yield is not high, so it is difficult to realize industrialized production
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Embodiment 1
[0018] Add 212g of phosphoric acid (85%) and 60g of urea in a four-necked flask equipped with a stirrer, a thermometer and a vent pipe, heat up to 80°C for 20 minutes, then slowly heat up to 195°C for 30 minutes, then cool to 90°C. Introduce 4 g of ammonia gas, the pH value reaches 6.5, then cool to normal temperature, and centrifuge to obtain 150 g of white solid product.
Embodiment 2
[0020] Add 1000g of phosphoric acid (85%) and 60g of urea in a four-necked flask equipped with a stirrer, a thermometer and a ventilation tube, heat up to 100°C for 20 minutes, then slowly heat up to 180°C for 30 minutes, and cool to 85°C. Introduce 40 g of ammonia gas, the pH value reaches 6, then cool to normal temperature, and centrifuge to obtain 450 g of white solid product.
Embodiment 3
[0022] Add 300g of phosphoric acid (85%) and 60g of urea in a four-necked flask equipped with a stirrer, a thermometer and a vent pipe, heat up to 110°C for 30 minutes, then slowly heat up to 170°C for 20 minutes, then cool to 80°C. 18 g of ammonia gas was introduced, and the pH value reached 6, then cooled to room temperature, and centrifuged to obtain 270 g of a white solid product.
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Abstract
This invention discloses the preparing method for a new kind of phosphorus-nitrogen composite flame retardant, especially for pyroammonium phosphate flame retardant. The pyroammonium phosphate flame retardant is synthesized mainly with commercial phosphoric acid and urea; cool to proper temperature after the reaction; adjust reaction by adding appropriate neutralization agent; cool crystallize; centrifuge to get the product. The pyroammonium phosphate flame retardant contains pyromonoammonium phosphate, pyrodiammonium phosphate, pyrotriammonium phosphate and pyrotetroammonium phosphate. Its phosphor content exceeds 25% and nitrogen content exceeds10%. Its non-aqueous solubility is moderate. It is highly effective and nontoxic, so it is broadly used in fireproofing coatings, flame-retardant platics, flame-retardant fibres, flame-retardant textiles, wood goods, and so on.
Description
technical field [0001] The invention relates to a novel phosphorus-nitrogen composite flame retardant, especially a production method of ammonium pyrophosphate flame retardant. Background technique [0002] Flame retardants are additives used to improve the combustion resistance of materials, that is, to prevent materials from being burned and to inhibit flame propagation, and are widely used in synthetic and natural polymer materials (including plastics, rubber, fibers, wood, paper, paints, coatings, etc.) etc.) flame retardant. Commonly used flame retardants can be divided into halogen-based, phosphorus-based, nitrogen-based, silicon-based, aluminum-based, magnesium-based, molybdenum-based, antimony-based, boron-based, etc. according to the flame-retardant elements they contain. [0003] As a halogen-free and high-efficiency flame retardant, the phosphorus-nitrogen composite system has strong flame retardancy, lower smoke, toxic and corrosive gas emissions, and less addit...
Claims
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Application Information
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