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Process for synthesizing environmentally-friendly flame retardant zinc borate
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A flame retardant, zinc borate technology, applied in borates, boron compounds, boron oxide compounds, etc., can solve the problems of complex separation process, high cost, unstable purity, low product purity, etc. Wide range of uses and high selling price
Inactive Publication Date: 2018-09-18
ZIBO WUWEI INDAL
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But this reaction has by-product sodium sulfate and boric acid to produce, and product purity is lower than boric acid method, utilizes a large amount of washing impurities to produce a large amount of waste water again, and the evaporative crystallizationseparation process of sodium sulfate and boric acid in waste water is complicated and costly and the purity of extraction is not high Stablize
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Embodiment 1
[0027] In a 5-ton reactor, add 1600kg of water, heat up to 60°C, add 1580kg of zinc sulfate, stir until dissolved, then add 1590kg of borax, stir to heat up to 80°C, add 60kg of zinc oxide, maintain the speed at 55 rpm, and heat up To 94-95°C, heat preservation reaction time for 4 hours, then add 75kg of zinc oxide, of which, add 15kg per minute, 75kg of zinc oxide is added in 5 minutes, the speed is controlled at 55r / min, 94-95°C heat preservation reaction time is 5 hours to react After completion, rinse, centrifuge, dry, and package to obtain 1550 kg of the target product, and the index detection is shown in Table 1.
[0028] Table 1 3.5 Detection index of zinc borate in water
[0029]
[0030]
Embodiment 2
[0032] In a 5-ton reactor, add 1600kg of water, heat up to 60°C, add 1600kg of zinc sulfate, stir until dissolved, then add 1600kg of borax, stir to raise the temperature to 80°C, add 62kg of zinc oxide, maintain the speed at 55 rpm, heat up To 94-95 ℃, heat preservation reaction time 4 hours. Then add 77.5kg of zinc oxide, of which 15kg per minute, 77.5kg of zinc oxide is added in 5 minutes, the speed is controlled at 55r / min, and the reaction time is 5 hours at 94-95°C. After the reaction is completed, rinse, centrifuge, dry, and pack , to obtain the target product 1580kg, and the index detection is shown in Table 2.
[0033] Table 2 3.5 Detection index of zinc borate water:
[0036] In a 5-ton reactor, add 1600kg of water, heat up to 60°C, add 1610kg of zinc sulfate, stir until dissolved, then add 1605kg of borax, stir to heat up to 80°C, add 62.5kg of zinc oxide, and maintain the speed at 55 rpm. Raise the temperature to 94-95°C, and keep the reaction time for 4 hours. Then add 79kg of zinc oxide, wherein, add 15kg per minute, add 79kg of zinc oxide in 5 minutes, the rotating speed is controlled at 55r / min, 94-95 ℃ of insulation reaction time 5 hours after the reaction is completed, rinse, centrifuge, dry, pack, get The target product is 1560kg, and the index detection is shown in Table 3.
[0037] Table 3 3.5 Detection index of zinc borate water:
[0038]
[0039]
[0040] Note: (1) Zinc borate, sodium sulfate and boric acid are produced after the first zinc oxide metathesis reaction is added for 4 hours, and zinc borate is obtained by adding zinc oxide for the second time and reacting with the by-product boric acid in the later stage.
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Abstract
The invention relates to a process for synthesizing environmentally-friendly flame retardant zinc borate. The process is as follows: adding water, heating to 40-60 DEG C, adding zincsulfate, stirringto dissolve, adding borax, stirring, heating to 70-80 DEG C, adding part of zincoxide , heating to 90-97 DEG C, maintaining the speed at 45-55 rev / min, thermally insulating for reaction for 3-4 hours, then adding zinc oxide, controlling the temperature at 90-97 DEG C, maintaining the speed at 45-55 rev / min, thermally insulating for reaction for 5-7 h, after the reaction is completed, discharging, rinsing, centrifuging, drying, and packing. Qualified zinc borate .3.5H2O is synthesized by adjusting the formula on the basis of a borate method, the product yield is high, boric acid in produced wastewater is very low, the wastewater almost only has sodiumsulfate, anhydroussodiumsulfate is obtained only by evaporation and crystallization of the wastewater, the process is environmentallyfriendly, and cost is greatly reduced.
Description
technical field [0001] The invention relates to a process for synthesizing an environment-friendly flame retardant zinc borate. Background technique [0002] With the rapid development of the synthetic materials industry, flame retardants are widely used in engineering plastics processing, electronic appliances, wood preservation, transportation, home decoration, forest fire fighting and other fields. Flame retardants are divided into inorganic flame retardants and organic flame retardants. With the improvement of environmental protection requirements in countries all over the world, inorganic flame retardants have been widely concerned and studied by research institutions in various countries because of their advantages such as non-toxicity, non-corrosion, and no secondary pollution. Among them, zinc borate has become the leader among inorganic flame retardants because of its good flame retardancy, low toxicity and smoke suppression, and high cost performance. [0003] Th...
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