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Process for preparing carboxyl functional macromolecular/SiO2 composite nano-particles

A composite nanoparticle and polymer technology, applied in the field of polymer materials, can solve the problems of difficulty in product separation, purification and purification, increased cost, and easy falling off of the coating layer, and achieves easy separation, purification and purification, improved production efficiency, and high chemical reaction. active effect

Inactive Publication Date: 2004-12-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This can not only solve the problems of cost increase caused by the use of emulsifiers in the previous production process, and the difficulty of product separation and purification, but also make the product suitable for applications that require high purity; The problem that the coating layer of the particles is easy to fall off during use ensures a strong chemical bond connection between the polymer layer and the surface of the inorganic particles; at the same time, the surface of the particles has carboxyl functional groups that can react with various substances, greatly improving its application value

Method used

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  • Process for preparing carboxyl functional macromolecular/SiO2 composite nano-particles
  • Process for preparing carboxyl functional macromolecular/SiO2 composite nano-particles
  • Process for preparing carboxyl functional macromolecular/SiO2 composite nano-particles

Examples

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Embodiment 1

[0048] Embodiment 1: the average particle diameter is 10 ± 5nm, and the specific surface area is 640m 2 / g nano-SiO 2 After dry treatment with 5wt% KH-570 silane coupling agent, weigh 4 parts and add to 100 parts of styrene monomer, stir and disperse evenly with ultrasonic waves. Mix 50 parts of oleic acid with a solution of 25 parts of sodium hydroxide and 100 parts of deionized water. Add 370 parts of deionized water to a four-necked bottle equipped with mechanical stirring, reflux condenser and thermometer, raise the temperature to 40° C., and then add one-fifth of the above-mentioned mixture of oleic acid and sodium hydroxide. Add the above monomers and SiO at 50°C 2 mixture. Then, add 80% of the initiator aqueous solution made up of 0.5 parts of water-soluble initiator ammonium persulfate and 75 parts of deionized water, and raise the temperature to 82° C. for 1 hour. Add the remaining 4 / 5 of the mixture of oleic acid and sodium hydroxide dropwise to the system, and r...

Embodiment 2

[0049] Embodiment 2: the average particle diameter is 10 ± 5nm, and the specific surface area is 640m 2 / g nano-SiO 2 After dry treatment with 5wt% KH-570 silane coupling agent, weigh 4 parts and add to 100 parts of styrene monomer, stir and disperse evenly with ultrasonic waves. Dissolve 10 parts of sodium acrylate in 30 parts of deionized water. Add 370 parts of deionized water to a four-neck bottle equipped with mechanical stirring, reflux condenser and thermometer, raise the temperature to 40°C, add 80% sodium acrylate solution, and then add the above monomers and SiO at 50°C 2 mixture. Then, add 50% of the initiator aqueous solution made up of 0.5 parts of water-soluble initiator ammonium persulfate and 75 parts of deionized water, and raise the temperature to 82° C. for 2 hours. Add the remaining sodium acrylate solution and react for 1 hour. Raise the temperature to 90°C, add the remaining initiator solution, continue to react for 2 hours, then cool and discharge, t...

Embodiment 3

[0050] Example 3: Change the styrene in Example 1 to an equivalent amount of butyl acrylate, and carry out the reaction at 60°C for 8 hours, and continue after adding the remaining 4 / 5 of the mixed solution of oleic acid and sodium hydroxide dropwise After reacting for 8 hours, the temperature was raised to 95° C., and the remaining initiator was added and the reaction was completed in 0.5 hour. The rest of the formula and steps were the same as in Example 1. The yield, grafting rate and grafting efficiency of the obtained product are 89.2%, 3478% and 88.1% respectively, and the particle size distribution is 50-60nm.

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Abstract

The present invention is the preparation process of functional composite nano carboxyl polymer / silica material, and belongs to the field of polymer material technology. The materials including nano SiO2 grain, coupling agent, organic olefin and olefin monomer containing carboxyl or carboxylate radical are produced into the functional composite nano carboxyl polymer / silica material through polymerization in soap-less emulsion or suspension with water as medium. The product is spherical grain with inorganic nano SiO2 as core, organic olefin polymer as shell and carboxyl radical as surface functional group, and has granular size smaller than 100 nm, very high chemically reacting activity and thus high application value and wide application range, especially in nano technology.

Description

technical field [0001] Preparation of carboxyl functional polymer / SiO by soap-free polymerization method involved in the present invention 2 Composite nanoparticles belong to the technical field of polymer materials. Background technique [0002] Due to the characteristics of both inorganic nanoparticles and organic polymers, polymer / inorganic powder nanocomposite particles can be widely used in many fields such as polymer materials, chemical industry, biology, medicine, microelectronics, etc., and play a role in the development of nanotechnology. Very important potential application value. Conventional emulsion polymerization or suspension polymerization is an important means to synthesize such nanocomposite particles. [0003] The applicant successfully introduced the carboxyl functional group into the polymer / SiO 2 particle surface, this carboxyl-functionalized polymer / SiO 2 The surface of the nanocomposite particles has highly reactive and ionizable carboxyl function...

Claims

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Application Information

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IPC IPC(8): C08F2/18C08F2/44C08F4/40C08F10/00C08F20/00C08L23/00
Inventor 于建曾重郭朝霞
Owner TSINGHUA UNIV
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