SiO2 core-polymer shell hybrid nanometer material preparation method

Abstract

The invention relates to a method for synthesizing hybridized nano material of SiO2-nucleus and polymer-shell. It comprises following steps: drying nano silica dioxide, fetching nano silica dioxide, gamma- methacryloyl propoxyl trimethoxy silicane according to weight ratio of 2:1 under nitrogen protection, reacting at temperature of toluene refluxing, vacuum drying and getting alkylated nano silica dioxide; adding anion surface activator, non-ionic surface activator and isopropyl alcohol, heating system to 75 Deg. C, dipping potassium peroxodisulfate for reaction, cooling and getting white powder said nano material. The invention solves problems of low solid content in nonsoap emulsion polymerization, uncontrollable of interaction between polymer microparticle of positive electricity and static electricity on surface of silica dioxide of negative electricity. The prepared hybridized nano particle is characterized by controllable shape, high purity, high solid content of 15%, and effect of increasing impulse strength, elongation at break, elastic modulus, and hardness and obstruct property for PVC membrane by 4% of hybridized nano material.

Description

technical field [0001] The present invention relates to a kind of synthetic method of nano material, particularly SiO 2 Synthesis of core-polymer shell hybrid nanomaterials. Background technique [0002] Nanocomposite materials are the fourth generation of materials after single-component materials, composite materials and gradient functional materials. Among them, organic-inorganic nanocomposites are known for their superior physical and chemical properties, especially in the fields of material mechanics, optics and electromagnetics. It has become one of the hotspots in materials science because of its excellent properties. [0003] Before the present invention, sol-gel method, intercalation method, in-situ polymerization dispersion method and blending method were mostly used to prepare organic-inorganic nanocomposite materials. Due to nano-SiO 2 The particle size is generally between 20 and 60nm. There are unsaturated residual bonds and hydroxyl groups in different bond...

AI Technical Summary

Problems solved by technology

Due to nano-SiO 2 The particle size is generally between 20 and 60nm. There are unsaturated residual bonds and hydroxyl groups in different bonding states on the surface. The specific surface energy is large, the cohesion is strong, and it is easy to agglomerate, making it difficult for nanoparticles to be uniformly dispersed in nanometer size during the preparation process. polymer

Soap-free emulsion polymerization has been used to prepare core-shell organic-inorganic hybrid materials, but the solid content of the system is often low, which limits the industrial application of this technology; there are also positively charged polymer particles and charged The principle of electrostatic interaction on the negatively charged silica surface makes the polymer microspheres surround the surface of the fine silica particles, thereby utilizing the shielding effect of the polymer microspheres around the silica particles to overcome the easy agglomeration of the fine silica particles. , the interface between the polymer microsphere and the fine silica is maintained by electrostatic interaction. This core-shell structure will be affected by the pH value and salt concentration of the system, making the structure uncontrollable and difficult to meet industrial production.

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