Alcoholate hydrolytic polycondensation solution and transparent films manufactured therefrom
A technology of hydrolysis polycondensation and alkoxy aluminum, which is applied in the direction of aluminum hydroxide preparation, metal material coating process, liquid chemical plating, etc., which can solve the problems of insufficient regulation of compound hydrolysis, heating, and aggregation of titanium oxide sol
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Embodiment 1
[0092] (photocatalytic particles)
[0093] Pre-weighed ion-exchanged water (50 L) was heated to 98° C. with stirring and maintained at this temperature. An aqueous solution of titanium tetrachloride (Ti concentration: 15% by mass) (product of Sumitomo Titanium Corporation) (3.6 kg) was added dropwise to the heated water over 60 minutes. The white suspension thus obtained was dialyzed by using an electronic dialyzer, whereby the pH of the suspension was adjusted to 4. Subsequently, the suspension was concentrated by using an ultrafiltration membrane, thereby obtaining a white slurry. A portion of the white slurry was collected, and the solid content was measured by the dry constant weight method and found to be 10% by mass. The obtained solid (dry powder) was subjected to structural analysis by using an X-ray diffraction apparatus. As a result, the powder was found to be brookite titanium dioxide. Assuming that the primary particles are true spheres, the titanium dioxide po...
Embodiment 2
[0101] In a similar manner to Example 1, pre-weighed ion-exchanged water (50 L) was heated to 98° C. with stirring and maintained at that temperature. An aqueous solution of titanium tetrachloride (Ti concentration: 15% by mass) (product of Sumitomo Titanium Corporation) (3.6 kg) was added dropwise to the heated water over 60 minutes. The white suspension thus obtained was dialyzed by using an electronic dialyzer, whereby the pH of the suspension was adjusted to 4.
[0102] Subsequently, sodium pyrophosphate (for food additives, Taihei Chemical Industrial Co., Ltd.) (0.1 kg) was added to the resulting titanium dioxide slurry, and the slurry was sufficiently stirred until pyrophosphate was dispersed in the slurry. Thereafter, calcium chloride (for food additives, product of Tokuyama Corporation) (200 g) was added to purified water (2,000 L) weighed in advance, thereby preparing a calcium chloride solution. The titanium dioxide slurry containing sodium pyrophosphate obtained ab...
Embodiment 3
[0107] In a similar manner to Example 1, pre-weighed ion-exchanged water (50 L) was heated to 98° C. with stirring and maintained at this temperature. An aqueous solution of titanium tetrachloride (Ti concentration: 15% by mass) (product of Sumitomo Titanium Corporation) (3.6 kg) was added dropwise to the heated water over 60 minutes. The white suspension thus obtained was dialyzed by using an electronic dialyzer, whereby the pH of the suspension was adjusted to 4.
[0108] Subsequently, sodium pyrophosphate (0.1 kg) was added to the resulting titanium dioxide slurry, and the slurry was stirred well until the pyrophosphate was dispersed in the slurry. Thereafter, the resulting slurry was washed by filtration by using a rotary filter press, whereby a photocatalytic particle-containing slurry was obtained. The solid content and pH of the resulting slurry were found to be 10% by mass and 8, respectively. The average primary particle size of the photocatalytic particles was foun...
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Abstract
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