A method of using α-calcium sulfate hemihydrate whiskers to flame-retardant polymer materials
A technology of calcium sulfate hemihydrate and flame retardant polymer is applied in the directions of polycrystalline material growth, chemical instruments and methods, crystal growth, etc., to achieve the effects of uniform size distribution, increased residual amount and regular morphology
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Embodiment 1
[0014] Measure 1L of 0.5mol / L calcium nitrate tetrahydrate solution and 1L of 0.5mol / L potassium sulfate solution, mix and stir for 30 minutes to prepare calcium sulfate dihydrate precipitate, wash the precipitate fully and prepare calcium sulfate with a mass fraction of 5%. Suspension, to which add calcium sulfate mass 1% MgSO 4 , stir and ultrasonically disperse evenly, and place the suspension in a reactor at 140° C. for 6 hours. The sample was filtered while it was hot, washed with hot water, and placed at 125°C for 6 hours to obtain α-calcium sulfate hemihydrate whiskers. Heat and dissolve 10g of polyvinyl alcohol 1788 in 190ml of distilled water in a water bath at 85°C, add 1g of α-calcium sulfate hemihydrate whisker sample to the polyvinyl alcohol solution, ultrasonically disperse, stir evenly, and dry in an oven at 150°C to All distilled water was removed. The resulting mixture sample was taken out into slices, and subjected to thermogravimetric analysis at 10°C / min ...
Embodiment 2
[0016] The preparation steps of α-calcium sulfate hemihydrate whiskers are the same as in Example 1, the difference is: add 5% MgSO of calcium sulfate quality 4 . Heat and dissolve 10g of polyvinyl alcohol 1799 in 190ml of distilled water in a water bath at 85°C, add 1g of α-calcium sulfate hemihydrate whisker sample to the polyvinyl alcohol solution, disperse it by ultrasonic, stir it evenly, and dry it in an oven at 150°C to All distilled water was removed. The resulting mixture sample was taken out into slices, and subjected to thermogravimetric analysis at 10°C / min at 25°C to 700°C.
Embodiment 3
[0018] The preparation steps of α-calcium sulfate hemihydrate whiskers are the same as in Example 1. Heat and dissolve 10g of polyethylene glycol 2000 in 190ml of distilled water in a water bath at 85°C, add 1g of α-calcium sulfate hemihydrate whisker sample to the polyethylene glycol solution, ultrasonically disperse, stir evenly, and put it in an oven at 150°C Dry until all the distilled water is removed. The resulting mixture sample was taken out into slices, and subjected to thermogravimetric analysis at 10°C / min at 25°C to 700°C.
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