Core/shell type tetragonal titanium oxide particle water dispersion, making method, UV-shielding organic silicone coating composition and coated article

A tetragonal system, titanium oxide technology, applied in titanium compounds, chemical instruments and methods, coatings, etc., can solve the problem of unknown method of coating thickness and so on

Active Publication Date: 2014-02-12
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no method is known to control the thickness of the coating at a level precise enough to eliminate the crushing and sieving steps

Method used

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  • Core/shell type tetragonal titanium oxide particle water dispersion, making method, UV-shielding organic silicone coating composition and coated article
  • Core/shell type tetragonal titanium oxide particle water dispersion, making method, UV-shielding organic silicone coating composition and coated article
  • Core/shell type tetragonal titanium oxide particle water dispersion, making method, UV-shielding organic silicone coating composition and coated article

Examples

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preparation example Construction

[0099] The second embodiment is a method for preparing an aqueous dispersion of core / shell tetragonal titanium oxide particles in which tin and manganese are solid-solution bound, the method comprising steps (A)-(D) described in detail below.

[0100] Step (A)

[0101] In step (A), an aqueous dispersion of tetragonal titanium oxide nanoparticles in which tin and manganese are bound in solid solution is firstly prepared. There is no particular limitation on the technique for preparing the aqueous dispersion. In a preferred procedure, starting materials including titanium compounds, tin compounds, manganese compounds, alkaline substances and hydrogen peroxide are reacted in an aqueous dispersion medium to form a solution of peroxytitanate containing tin and manganese, for which A hydrothermal reaction is carried out to obtain an aqueous dispersion of tetragonal titanium oxide nanoparticles in which tin and manganese are solid-solution bound.

[0102] The preceding stage of t...

Embodiment

[0197] Examples and comparative examples are given below by way of illustration and not limitation.

[0198] All parts are by weight unless otherwise indicated. The reactants were purchased from chemical suppliers including Wako Pure Chemical Industries, Ltd. (abbreviated as Wako) and Shin-Etsu Chemical Co., Ltd. (abbreviated as Shin-Etsu).

[0199] Preparation of Titanium Oxide Dispersion

Synthetic example 1

[0201] Preparation of titanium oxide dispersion (i) (relative to 100 mol% titanium, 4 mol% tin and 0.5 mol% manganese)

[0202] To 66.0 g of a 36% by weight titanium (IV) chloride aqueous solution (TC-36 manufactured by Ishihara Sangyo Kaisha, Ltd.) were added 1.8 g of tin (IV) chloride pentahydrate (Wako) and 0.12 g of chlorine Manganese(II) tetrahydrate (Wako). They were mixed well and diluted with 1,000 g of deionized water. To this metal salt aqueous solution mixture, 300 g of 5% by weight ammonia water (Wako) was gradually added to neutralize and hydrolyze to obtain a precipitate of titanium hydroxide containing tin and manganese. The titanium hydroxide slurry was pH 8. The precipitate of titanium hydroxide was deionized by repeated addition of deionized water and decantation. To the deionized titanium hydroxide precipitate containing tin and manganese, 100 g of 30% by weight aqueous hydrogen peroxide (Wako) was gradually added, and stirring was continued at 60° C. for...

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Abstract

Core / shell type tetragonal titanium oxide particles consisting of a nanosized core of tetragonal titanium oxide having tin and manganese incorporated in solid solution and a shell of silicon oxide around the core are dispersed in an aqueous dispersing medium. The cores and the core / shell type titanium oxide particles have an average particle size of @30 nm and @50 nm, respectively. The amount of tin or manganese in solid solution is to provide a molar ratio Ti / Sn or Ti / Mn between 10 and 1,000.

Description

technical field [0001] The present invention relates to an aqueous dispersion of core / shell tetragonal titanium oxide particles, a method for preparing the aqueous dispersion, an ultraviolet-shielding silicone coating composition comprising the aqueous dispersion, and articles coated with the composition. More specifically, it relates to an aqueous dispersion of core / shell type tetragonal titanium oxide particles consisting of a nano-sized core of tetragonal titanium oxide incorporating tin and manganese in solid solution and a shell of silicon oxide; pulverization is not required A method for preparing the aqueous dispersion capable of controlling the thickness of the silica shells with a sieving step; an ultraviolet-shielding silicone coating composition or hardcoat composition comprising the aqueous dispersion, It is capable of forming a cured film satisfying weather resistance and ultraviolet shielding ability and having transparency, scratch resistance and adhesiveness wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12C09D183/04C08J7/04C01G23/00C08J7/043C08J7/046
CPCC01G23/002C01P2002/84C09C1/3684G02B1/105C01P2002/72C01P2004/84C01P2004/64C01P2002/52B82Y30/00C08J7/042C08J2443/04C08J2483/04Y10T428/256C01G23/003C08J7/043C08J7/046C09D183/00C01G23/00G02B1/14
Inventor 增田幸平樋口浩一小森久敏古馆学井上友博荣口吉次
Owner SHIN ETSU CHEM IND CO LTD
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