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Fine particles of tin-modified rutile-type titanium dioxide

一种金红石型、氧化钛的技术，应用在二氧化钛、氧化钛/氢氧化物、锡化合物等方向，能够解决耐光性不充分、无法得到金红石型氧化钛、效果差等问题，达到耐光性优异的效果

Inactive Publication Date: 2007-05-16
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are disadvantages in that due to the high temperature of 220°C, the crystal diameter exceeds 20nm, and because tin oxide is mixed, it is impossible to obtain good rutile-type titanium oxide.
However, since the titanium oxide used is anatase type, when the refractive index is about 2.5 and it is coated with a metal oxide to improve light resistance, the refractive index will be greatly lowered, which is lower than that of the original anatase. Refractive index of titanium oxide type, resulting in poor effect of improving the refractive index of the coating film
Even if the amount of coated metal oxide is reduced to increase the refractive index, the light resistance is still insufficient. At present, when it is used for high refractive index substrates, especially spectacle lens substrates of 1.70 or more, it is difficult to maintain light resistance. Increase the refractive index of the coating film, and the interference fringes cannot be completely eliminated

Method used

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  • Fine particles of tin-modified rutile-type titanium dioxide
  • Fine particles of tin-modified rutile-type titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] 0.09 g of tin tetrachloride pentahydrate was charged into a 100 ml eggplant-shaped flask, dissolved in 50 ml of ion-exchanged water, and 5 ml of titanium oxychloride hydrochloric acid aqueous solution (containing Ti 15 wt %) was added. The pH of the solution was -0.1 (the concentration of Ti added = 0.45, the molar ratio of Sn / Ti = 0.01). Stir with a magnetic stirrer and heat at 50° C. for 1 hour to obtain a white precipitate. The white precipitate was collected by centrifugation and redispersed in ion-exchanged water. Ultrafiltration was performed to obtain a sol solution with a solid content of 1.3 wt%. The powder X-ray diffraction measurement and electron microscope observation of this solid content were performed. Powder X-ray diffraction was measured after drying with hot air at 120°C for 2 hours. The result is shown in Figure 1. The crystal diameter was calculated from the half width of the diffraction peak using the Debye-Sherrer formula. As a result, the av...

Embodiment 2

[0132] In Example 1, except having used 0.27g of tin tetrachloride pentahydrate, it carried out similarly to Example 1 (the concentration of Ti added=0.45, Sn / Ti=0.03). The solid content of the obtained sol solution was analyzed in the same manner as in Example 1 to obtain rutile-type titanium oxide having a crystal diameter with an average minor axis of 5 nm, an average major axis of 8 nm, and an average aggregated particle diameter of 23 nm. The elemental molar ratio of Sn / Ti was 0.02. When the refractive index of the solid component was evaluated in the same manner as in Example 1, n=2.72. The results of powder X-ray diffraction are shown in FIG. 2 .

Embodiment 3

[0134] In Example 1, except having used 0.9g of tin tetrachloride pentahydrate, it carried out similarly to Example 1 (the concentration of Ti added=0.45, Sn / Ti=0.1). The solid content of the obtained sol solution was analyzed in the same manner as in Example 1 to obtain rutile-type titanium oxide having a crystal diameter with an average minor axis of 5 nm, an average major axis of 8 nm, and an average aggregate particle diameter of 20 nm. The element molar ratio of Sn / Ti was 0.06. When the refractive index of the solid component was evaluated in the same manner as in Example 1, n=2.65. The results of powder X-ray diffraction are shown in FIG. 3 .

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Abstract

The present invention provides a hard coat, a primer, a light curable coating liquid, a coat film or a resin composition which is free from the generation of an interference fringe when applied on an optical substrate having a refractive index of 1.60 or more, and is excellent in scratch resistance, surface hardness, abrasion resistance, adhesiveness, transparency, heat resistance, photo-durability, weather resistance, ultraviolet interrupting property and the like. The present invention relates to fine particles of a tin-modified rutile-type titanium dioxide obtained through the reaction of an aqueous solution of a titanium compound having a Ti concentration of 0.07 to 5 mol / l at a pH in the range of -1 to 3 in the co-presence of a tin compound at a molar ratio of tin to titanium (Sn / Ti) of 0.001 to 2, wherein said fine particle has an Sn / Ti composition molar ratio of 0.001 to 0.5, and a short axis and a long axis of a crystal grain diameter thereof have a length of 2 to 20 nm.

Description

technical field [0001] The present invention relates to fine particles having a high refractive index and excellent light resistance, a sol solution, and a coating liquid containing the fine particles, and also relates to scratch resistance, surface hardness, abrasion resistance, transparency, heat resistance, light resistance, and weather resistance A coating film, a resin composition, and a preparation method thereof are provided which have good properties in UV shielding and do not generate interference fringes when formed on a substrate. Background technique [0002] Representative crystal forms as titanium oxide include rutile type and anatase type. So far, as a high refractive index metal oxide fine particle sol solution, a material mainly composed of anatase-type titanium oxide fine particles having a refractive index of no=2.56 and ne=2.49 has been mainly used. And the refractive index of known rutile type titanium oxide is refractive index no=2.61, ne=2.9 (no: to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B32B27/20C09C1/36C09C3/06C09D4/00C09D5/00C09D7/12C09D17/00C09D183/00G02B1/10C09D7/62
CPCC09D4/00C01P2004/54C09D7/1225C09C1/3684C01G23/053C08K9/02C09D5/002C09D7/1266C09C1/3661C09C1/3607C08K3/22C01P2002/72G02B1/105C01P2004/64B82Y30/00C09D7/62C09D7/67Y10T428/2991Y10T428/256Y10T428/268Y10T428/2982G02B1/14C01G23/04C01G19/00C01G23/00G02B1/11
Inventor 饭岛朋范中山德夫林丰治
Owner MITSUI CHEM INC
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