Sulfonic acid functional macromolecular/SiO2 composite nano-particles and process for preparing same

A composite nanoparticle and functional technology, which is applied in the field of sulfonic acid functional polymer/SiO2 composite nanoparticle and its preparation, can solve the problems of shedding of the coating layer, difficulty in separation, purification and purification of products, and increase in cost, so as to reduce production Cost, good chemical reactivity, ease of storage and use

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

AI Technical Summary

Problems solved by technology

Since the soap-free polymerization method described in the present invention does not use additional emulsifiers, it can solve the problems of cost increase due to the use of emulsifiers in the previous production process, and the difficulty of product separation and purification, so that the product can meet the purity requirements. It has a high application field; and ensures a strong chemical bond connection between the polymer layer and the surface of the inorganic particles, which can solve the problem that the coating layer of the coated nanoparticles is easy to fall off in use; at the same time, the surface sulfonic acid The introduction of the sulfonic acid group can not only improve the interfacial compatibility between the composite nanoparticles and the matrix by reacting with the filling matrix, but more importantly, the broad reaction range and easy ionization characteristics of the sulfonic acid group endow the nanoparticles with high reactivity. , so that it can be widely used in polymer material modifiers, water treatment agents, catalysts, sensing agents, protein carriers, microcapsule embedding and other fields, and its application value has been qualitatively improved

Method used

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  • Sulfonic acid functional macromolecular/SiO2 composite nano-particles and process for preparing same
  • Sulfonic acid functional macromolecular/SiO2 composite nano-particles and process for preparing same
  • Sulfonic acid functional macromolecular/SiO2 composite nano-particles and process for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: Set the average particle size to 10±5nm and the specific surface area to 640m 2 / g of nano SiO 2 After dry treatment with 5wt% KH-570 silane coupling agent, 4 parts are weighed and added to 100 parts of styrene monomer, stirred and ultrasonically dispersed uniformly. Add 370 parts of deionized water and 7 parts of sodium 1-tetradecenyl sulfonate into a four-necked flask equipped with mechanical stirring, reflux condenser and thermometer. Add monomer and SiO 2 mixture. Then, 80% of the initiator aqueous solution prepared by 0.5 parts of water-soluble initiator ammonium persulfate and 75 parts of deionized water was added, and the temperature was raised to 82° C. for 1.5 hours. The temperature is raised to 90°C, the remaining water-soluble initiator solution is added, the reaction is continued for 0.5 hours, and the material is cooled and discharged. After the discharged part of the emulsion was demulsified, washed, and dried, a white powdery product was obtained. ...

Embodiment 2

[0047] Example 2: Change the styrene in Example 1 to the same amount of butyl acrylate. The reaction was carried out at 60°C for 8 hours. After adding the remaining water-soluble initiator, the reaction was completed for 2 hours. The rest of the formula and steps were the same as those in Example 1. the same. The yield, grafting rate and grafting efficiency of the obtained product are 94.6%, 2723% and 96.7%, respectively, and the particle size distribution is 60-70 nm.

Embodiment 3

[0048] Example 3: Change the styrene in Example 1 to a mixture of isobutadiene and methyl methacrylate (half each) with the same total weight, add 50% of the total initiator at 50°C, and react at 95°C Continue for 0.5 hours, and the rest of the formula and steps are the same as in Example 1. The yield, grafting rate and grafting efficiency of the obtained product are respectively 93.8%, 2579% and 91.6%, and the particle size distribution is 60-70 nm.

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Abstract

The present invention belongs to the field of polymer material technology. Nano silica grain, coupling agent, organic olefin monomer and olefin monomer containing sulfonic radical or sulfonate radical as materials are polymerized in soap-free emulsion with water as medium or soap-free suspension polymerized to prepare the composite functional nano sulfonic polymer / SiO2 particle. The product is spherical particle with inorganic nano SiO2 as core, organic polyolefin as shell and sulfonic radical as surface functional group, and has particle size smaller than 100 nm. The present invention has lowered production cost and easy purification of product, and may meet high purity requirement. The introduction of sulfonic radical results in high chemical reaction activity and ionizing capacity and thus raised application value.

Description

Technical field [0001] The invention relates to a sulfonic acid functional polymer / SiO 2 Composite nano particles and a preparation method thereof belong to the technical field of polymer materials. Background technique [0002] Polymer / inorganic powder nanocomposite particles have the characteristics of both inorganic nanoparticles and organic polymers, so they can be widely used in polymer materials, chemical engineering, biology, medicine, microelectronics and many other fields. Very important potential application value. Conventional emulsion polymerization or suspension polymerization is an important method for synthesizing such nanocomposite particles. [0003] The applicant has successfully introduced epoxy functional groups into polymer / SiO in the applied patent (application number: 03143111.9) 2 Particle surface, this surface epoxy functionalized polymer / SiO 2 When the nanocomposite particles are filled into the polymer matrix, the properties of the matrix can be qualita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/16C08F2/44C08K3/36C08L101/02
Inventor 于建曾重郭朝霞
Owner TSINGHUA UNIV
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