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A method for nano TiO2 polymerization synergistic modification of natural pearls

A synergistic modification and natural technology, applied in jewelry, clothing, applications, etc., can solve the problems of environmental erosion, pearl loss of use value, pearl aging, etc., to achieve simple preparation process, improved wear resistance, good anti-corrosion The effect of UV oxidation

Inactive Publication Date: 2009-05-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The color and luster of pearls are two important factors that determine its value. After these damages, pearls basically lose their use value.
[0004] To solve the problem of pearl aging and vulnerability to environmental erosion, it is necessary to develop high-quality anti-aging and erosion-resistant pearl preparation technology

Method used

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  • A method for nano TiO2 polymerization synergistic modification of natural pearls

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Experimental program
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Effect test

Embodiment 1

[0020] 1) At 80°C, mix titanyl sulfate and hydrogen peroxide to prepare TiO 2 Aqueous sol, Ti / H 2 o 2 The molar ratio is 1:1, and the sol concentration is controlled at 0.1mol / L;

[0021] 2) React the natural pearl with the water-based sol for 5 seconds, then spin dry it in a 50°C thermostat at 30 RMP for 10 minutes, and then heat-treat it in a muffle furnace at 100°C for 10 minutes to obtain nano-TiO on the surface. 2 intermediate natural pearls;

[0022] 3) Aqueous emulsions with trade names AB-EP-20 and AB-HGF and deionized water are stirred and reacted to prepare an aqueous solution precursor, and the volume ratio of deionized water:AB-EP-20:AB-HGF is 20:4 :1;

[0023] 4) with the nano-TiO that step 2) makes 2 Intermediate natural pearls are polymerized with the precursor solution prepared in step 3) for 5 seconds, spin-dried at 30 RMP in a 50°C thermostat for 1 hour, and then placed in a muffle furnace for heat treatment at 100°C for 80 minutes to obtain nano-TiO 2 ...

Embodiment 2

[0032] 1) At 100°C, Ti(OH) 4 Mixed with hydrogen peroxide to prepare TiO 2 Aqueous sol, Ti / H 2 o 2 The molar ratio is 1:4, and the sol concentration is controlled in the range of 0.5mol / L;

[0033] 2) React natural pearls with aqueous sol for 60 seconds, then dry at 100°C, and heat-treat at 500°C in a muffle furnace for 10 seconds to obtain nano-TiO on the surface 2 Modified intermediate natural pearls;

[0034] 3) Aqueous emulsions with trade names AB-EP-20 and AB-HGF and deionized water are stirred and reacted to prepare an aqueous solution precursor, and the volume ratio of deionized water:AB-EP-20:AB-HGF is 100:4 :1;

[0035] 4) with the nano-TiO that step 2) makes 2 The natural pearl in the intermediate state is polymerized with the precursor solution prepared in step 3) for 60 seconds, dried at 100°C, and then placed in a muffle furnace for heat treatment at 200°C for 10 minutes to obtain nano-TiO 2 - Polymerization of synergistically modified natural pearls.

[...

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Abstract

The invention relates to a method for producing nanoTiO2 Polymerization synergism-modified natural pearl. the method comprises the steps of: 1) preparing aqueous collosol, 2) carrying out a reaction between the natural pearl and aqueous collosol, drying, heat-treating to obtain intermediate state nano TiO2 modified natural pearl, 3) stirring the aqueous emulsion and deionized water for reaction to prepare precursor of aqueous solution, and 4) carrying out a polyreaction between the intermediate state nano TiO2 modified natural pearl and precursor Solution, drying, and heat-treating to obtain the final product. The product of the invention has the advantages of good uvioresistant oxidation and decay resistance performance. it is showed that the yellowing speed is reduced to 0 from the former 1.76% by 72h intensify experiment, polish descent speed is reduced to 0 from the former 2.87% by 10h sweat soaking experiment. The polish is improved with one or two rates than common pearl.

Description

technical field [0001] The present invention relates to nanometer TiO 2 - A method of synergistically modifying natural pearls by polymerization. Background technique [0002] Pearl is a precious organic gemstone. According to its origin, it can be divided into natural pearls and cultured pearls. According to the production environment, it can be divided into seawater pearls and freshwater pearls. The most common type in the market is freshwater cultured pearls. my country is a big pearl farming country, and the cultivation of freshwater pearls is mainly concentrated in the provinces and regions with developed freshwater water systems in the middle and lower reaches of the Yangtze River. Zhejiang is an important production area for freshwater pearls. By 2002, the output of freshwater pearls in my country had exceeded 2,000 tons per year, accounting for 90% of the world's total. However, there is a large gap between my country's current optimized processing technology and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A44C27/00
Inventor 杜丕一王慧翁文剑韩高荣赵高凌汪建勋宋晨路沈鸽徐刚张溪文
Owner ZHEJIANG UNIV
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