A kind of preparation method of nano alumina sol and gel
A nano-alumina sol technology, applied in the chemical industry, can solve problems such as unsatisfactory solid content of nano-alumina sol, and achieve the effects of small particle size, reduced agglomeration, and good stability
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Embodiment 1
[0041] Preparation process such as figure 1 As shown,
[0042] (1) Preparation of nano alumina suspension
[0043] 3.5 kg of alumina nanoparticles were introduced into 6.5 kg of deionized water by high-speed stirring to obtain a nano alumina mixture. Add 0.2% of the alumina nanoparticle mass lactic acid dispersant and an appropriate amount of additives to the nano alumina mixture, and stir. A nano alumina suspension with a particle content of 35% was prepared in 5 hours.
[0044] (2) Crush and disperse to obtain nano alumina sol
[0045] Add 3.5kg agate ball to the nano alumina suspension with a solid content of 35% at a ball-to-battery ratio of 1:1. The ball has a particle size of 5mm. The ball is further pulverized and dispersed by a planetary ball mill at a rotation speed of 250 rpm. Under the condition of ball milling for 24 hours, a nano alumina sol with a solid content of 35% was prepared.
[0046] Use scanning electron microscope S-4800 (Hitachi Co., Japan) to characterize the ...
Embodiment 2～8
[0048] 0.5%, 0.7%, 1.0%, 2.0%, 3.0%, 4.0% and 5.0 of the lactic acid dispersant and appropriate additives were added to the nano-alumina mixed liquid, and the rest were the same as in Example 1.
[0049] The particle size of the nano alumina dispersion was measured by the Malvern laser particle size analyzer Zetasizer NanoZS. The test results are shown in Table 1 and Figure 4 .
[0050] Table I
[0051] Specific embodiment
[0052] It can be seen from Table 1 that under the same conditions, increasing the addition of lactic acid dispersant, the particle size of nano-alumina gradually decreases, at 2.0-3.0%, the particle size reaches the trough, and then the particle size starts to increase.
Embodiment 9～13
[0054] 4.0 kg of nano alumina particles were introduced into 6.0 kg of deionized water by high-speed stirring, and 2.0% lactic acid dispersant was added, and stirred for 5 hours to obtain a nano alumina suspension with a particle content of 40%; the above particle content was 40% Add 4.0kg of agate balls according to the ball-to-battery ratio of 1:1. The particle size of the ball is 5mm. The ball is further pulverized and dispersed by a planetary ball mill. 10, 20, 40, and 60 hours to prepare nano alumina sol with a content of 40%. The particle size of nano alumina dispersion is shown in Table 2 and Figure 5 .
[0055] Table II
[0056] Specific embodiment
[0057] From Table 2 and Figure 4 It can be seen that under the same conditions, the longer the milling time, the smaller the particle size of nano alumina in the sol.
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