Preparation method of light-weight ammonium polyphosphate/silicon dioxide composite flame retardant
A technology of composite flame retardant and ammonium polyphosphate, which is applied in the field of preparation of lightweight ammonium polyphosphate/silica composite flame retardant, can solve problems such as high density, achieve improved hygroscopicity and dispersibility, and low density Effect
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Embodiment 1
[0015] Example 1. At room temperature, add type I ammonium polyphosphate into water and stir to dissolve, the weight / volume ratio of ammonium polyphosphate to water is 1:15, then add tetraethyl orthosilicate to the above solution under stirring, wherein Ammonium polyphosphate and SiO 2 The weight ratio of ammonium polyphosphate is 1:2, and then hydrochloric acid is added to control the pH value of the system at 5. After stirring for 4 hours, the silica sol mixed solution of ammonium polyphosphate is obtained. The obtained sol was spray-dried at a spray temperature of 140° C. and a detection temperature of 110° C. to obtain a white powder. The prepared white powder was dried at 80°C for 24 hours, and then vacuum-dried at 60°C for 8 hours to obtain a lightweight ammonium polyphosphate / silicon dioxide composite flame-retardant material with a hollow microsphere structure.
Embodiment 2
[0016] Example 2. At room temperature, add type I ammonium polyphosphate into water and stir to dissolve, the weight / volume ratio of ammonium polyphosphate to water is 1:20, then add methyl orthosilicate to the above solution under stirring, wherein Ammonium polyphosphate and SiO 2 The weight ratio of ammonium polyphosphate is 1:3, and then sulfuric acid is added to control the pH value of the system at 5. After stirring for 5 hours, the silica sol mixed solution of ammonium polyphosphate is obtained. The obtained sol was spray-dried at a spray temperature of 180° C. and a detection temperature of 120° C. to obtain a white powder. The prepared white powder was dried at 90°C for 12 hours, and then vacuum-dried at 70°C for 6 hours to obtain a lightweight ammonium polyphosphate / silicon dioxide composite flame-retardant material with a hollow microsphere structure.
Embodiment 3
[0017] Example 3. At room temperature, add type I ammonium polyphosphate into water and stir to dissolve, the weight / volume ratio of ammonium polyphosphate to water is 1:30, then add orthosilicate to the above solution under stirring, wherein Ammonium polyphosphate and SiO 2 The weight ratio of ammonium polyphosphate is 1:8, and then hydrochloric acid is added to control the pH value of the system at 4. After stirring for 4 hours, the silica sol mixed solution of ammonium polyphosphate is obtained. The obtained sol was spray-dried at a spray temperature of 160° C. and a detection temperature of 120° C. to obtain a white powder. The prepared white powder was dried at 80°C for 8 hours, and then vacuum-dried at 60°C for 6 hours to obtain a lightweight ammonium polyphosphate / silicon dioxide composite flame-retardant material with a hollow microsphere structure.
[0018] At room temperature, add type I ammonium polyphosphate into water and stir to dissolve. The weight / volume ratio...
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