Silicon dioxide composite particle with far-infrared radioactivity; precursor of the same and application thereof

Patent metadata

Field	Value
Publication number	US-11795058-B2
Application number	US-201916531947-A
Country	US
Kind code	B2
Filing date	Aug 5, 2019
Priority date	Dec 10, 2018
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

The present invention relates to a silicon dioxide composite particle with far-infrared radioactivity, which is formed by the hydrolysis, condensation and polymerization of an organic silane precursor having the structure of the formula (I) with a tetra-alkoxysilane. The high stability of organic silane precursor compounds and the low biotoxicity of silicon dioxide composite particles make the present far-infrared radioactive silicon dioxide composite particles of great potential for extensive use in related bio-products.A-R1—Si(OR2)3   Formula (I)

First claim

The invention claimed is:

1. An organic silane precursor for preparing a silicon dioxide composite particle, characterized in that the organic silane precursor is of the formula (I) A-R 1 —Si(OR 2 ) 3 , wherein
R 1 is a C 2-4 alkylene group,
R 2 is a C 1-2 alkyl group,
A is selected from

R 3 is an unsubstituted C 1-18 linear or branched alkyl group or alkoxyl group, and
n is a number of 1 to 5.

2. The organic precursor according to claim 1 , wherein the alkoxyl group is

wherein R 4 is an unsubstituted C 1-18 linear or branched alkyl group.

3. A method for preparing a silicon dioxide composite particle by undergoing hydrolysis and condensation polymerization of the organic silane precursor according to claim 1 with a tetra-alkoxy silane, wherein the method is comprised of the following steps:
mixing the organic silane precursor and the tetra-alkoxy silane in an alcohol solvent to form a mixture; adding an alkaline solution to the mixture to undergo hydrolysis and condensation polymerization, and to produce another mixture with a solid;
filtering, washing and drying the solid particle to yield the silicon dioxide composite particle.

4. The method according to claim 3 , wherein the tetra-alkoxy silane is a tetra ethoxysilane.

5. The method according to claim 3 , wherein the alcohol solvent is an ethanol solution.

6. The method according to claim 3 , wherein the alkaline solution is an ammonia solution.

7. A silicon dioxide composite particle with long carbon chains of the formula A-R 1 on its surface, wherein the silicon dioxide composite particle is prepared by undergoing hydrolysis and condensation polymerization of an organic silane precursor with a tetra-alkoxy silane, comprising the following steps:
mixing the organic silane precursor and the tetra-alkoxy silane in an alcohol solvent to form a mixture;
adding an alkaline solution to the mixture to undergo hydrolysis and condensation polymerization, and to produce another mixture with a solid; and
filtering, washing and drying the solid to yield the silicon dioxide composite particle,
wherein the organic silane precursor is of the formula (I) A-R 1 —Si(OR 2 ) 3 ,
R 1 is a C 2-4 alkylene group,
R 2 is a C 1-2 alkyl group,
A is selected from

and
R 3 is an unsubstituted C 1-18 linear or branched alkyl group or alkoxyl group, and n is a number of 1 to 5.

Assignees

• Univ Nat Chi Nan
• Great Chain Chemical Ltd

Inventors

• Lai Long-Li
• Lee Cheng-Hua
• Lu Yao-Chih
• Chang Ya-Lin

Classifications

• C01B33/126 Primary

  Preparation of silica of undetermined type · CPC title

• C07F7/1804

  Compounds having Si-O-C linkages (Si-O-acyl linkages C07F7/1896) · CPC title

• C01P2006/88

  Isotope composition differing from the natural occurrence · CPC title

• C01B33/12 Primary

  Silica; Hydrates thereof, e.g. lepidoic silicic acid · CPC title

• C07F7/1892

  by reactions not provided for in C07F7/1876 - C07F7/1888 · CPC title