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Process for preparing nano-stage ammonium octamolybdate

A nano-scale technology of ammonium octamolybdate, which is applied in the field of preparation of ultra-fine particle size smoke suppression flame retardant, can solve the problems of small specific surface area per unit mass, long preparation process, and excessive silicon content in products, and achieve consistency Good, short process, high cost performance

Inactive Publication Date: 2009-03-18
JIANGSU GUANGMING NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the paste material is centrifuged and dehydrated, it is packed in a stainless steel container and sent to an oven for drying, and finally it is mechanically crushed into a powdered ammonium octamolybdate product; since the ammonium octamolybdate prepared by the prior art has a limit particle size of 0.9 ~6um, wide range of particle size distribution, small specific surface area per unit mass, can no longer meet the actual needs of modern industry
In addition, in the prior art, the powder has the phenomenon of permeation during the preparation process, the yield of the finished product is low, the dehydration is not clean, the water evaporates slowly after standing dry, the particle agglomeration phenomenon is obvious, and the preparation process is long, which is easy to bring in mechanical impurities , the dust in the air falls into some obvious disadvantages such as the silicon content of the product exceeds the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add high-purity molybdenum trioxide into the ammonium heptamolybdate solution, prepare according to the ammonium-molybdenum ratio in the solution as 1:2 (molar ratio), and add 0.15% (weight percent) surfactant decachloride to the solution. Dialkyl trimethyl ammonium, heat the solution to 58°C, keep warm and stir for 0.5h, then heat the solution to 98°C, keep warm and stir for 2h and keep the liquid level of the solution unchanged, the solution gradually reacts to form a white paste For pasty materials, the pasty materials are continuously fed into the GSX rotary flash dryer, and are simultaneously dried and pulverized under the conditions of a drying temperature of 100°C and a vortex air flow of 380m / s. The nano-scale ammonium octamolybdate particle size, yield, water content and processing time prepared under this working condition are shown in the table below.

Embodiment 2

[0022] Add high-purity molybdenum trioxide into the ammonium heptamolybdate solution, prepare according to the ammonium-molybdenum ratio in the solution as 1:2 (molar ratio), and add 0.15% (weight percent) surfactant decachloride to the solution. Dialkyl trimethyl ammonium, heat the solution to 60°C, keep warm and stir for 0.5h, then heat the solution to 100°C, keep warm and stir for 2h and keep the liquid level of the solution unchanged, the solution gradually reacts to form a white paste For pasty materials, the pasty materials are continuously fed into the GSX rotary flash dryer, and are simultaneously dried and pulverized under the conditions of a drying temperature of 105°C and a vortex airflow of 340m / s. The nano-scale ammonium octamolybdate particle size, yield, water content and processing time prepared under this working condition are shown in the table below.

Embodiment 3

[0024] Add high-purity molybdenum trioxide into the ammonium heptamolybdate solution, prepare according to the ammonium-molybdenum ratio in the solution as 1:2 (molar ratio), and add 0.15% (weight percent) surfactant decachloride to the solution. Dialkyl trimethyl ammonium, heat the solution to 60°C, keep warm and stir for 0.5h, then heat the solution to 102°C, keep warm and stir for 2h and keep the liquid level of the solution unchanged, the solution gradually reacts to form a white paste For pasty materials, the pasty materials are continuously fed into the GSX rotary flash dryer, and are simultaneously dried and pulverized under the conditions of a drying temperature of 105°C and a vortex airflow of 340m / s. The nano-scale ammonium octamolybdate particle size, yield, water content and processing time prepared under this working condition are shown in the table below.

[0025] (The rest of the content is the same as in Example 1, only the heating temperature is changed from 5...

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PUM

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Abstract

This invention discloses a preparation method for nanometer-level 8-ammonium molybdate including: adding MoO3 into a 7-ammonium molybdate solution for reaction, in which, the mol ratio of ammonium and molybdenum is 1 : 2 and adding small amount of surface active agent chloridized 12alkyl trimethyl-ammonium to be heated and mixed to generate non-dissolved paste mash material, which is sent to a GSX rotary flash steaming drier to be dried under 100-106deg.C to realize dynamic drying and crush under the condition that the speed of the vortex gas flow is 320-380m / s..

Description

technical field [0001] The invention relates to a preparation method of a smoke-suppressing flame retardant, in particular, the invention relates to a preparation method of a smoke-suppressing flame retardant with an ultrafine particle size. Background technique [0002] Ammonium octamolybdate is a new type of smoke suppression flame retardant and a chemical additive. The prior art produces ammonium octamolybdate by utilizing the reaction of high-purity molybdenum trioxide in ammonium heptamolybdate solution to produce water-insoluble paste-like material. After the paste material is centrifuged and dehydrated, it is packed in a stainless steel container and sent to an oven for drying, and finally it is mechanically crushed into a powdered ammonium octamolybdate product; since the ammonium octamolybdate prepared by the prior art has a limit particle size of 0.9 ~6um, wide range of particle size distribution, small specific surface area per unit mass, which can no longer meet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G39/00C01C1/00
Inventor 丁舜
Owner JIANGSU GUANGMING NEW MATERIAL