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Preparation and Characterization of Nano Rutile TiO2 Used for High Polymers Modification

Author: ZhangGuoYong
Tutor: YangHui
School: Zhejiang University
Course: Materials Science and Engineering
Keywords: Polymer materials Resistance to UV aging Rutile Titania Silane Prepared at Low Temperature Surface modification
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 126
Quote: 0
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Abstract


Nanosized rutile TiO2 as a performance superior the inorganic UV shielding agent and absorbent, not only scattering UV light into the material inside, but also through the electronic transition effectively absorb UV energy, UV aging resistance of polymer materials The modified areas has been a widely used. However, the surface of TiO2 nanoparticles easily absorb a large number of hydroxyl groups and significant hydrophilic, leading with most polymer materials compatibility, prone to aggregation and phase separation. Therefore, in order to improve the dispersion of nano-TiO2 in the polymer materials, the surface modification of nano-TiO2 has become the focus of research in the field. In this paper, the current nano-TiO2 powder dispersed the modification process exists the problem of poor dispersion and modification effect proposed nanosized rutile TiO2 prepared at low temperatures and organic surface modifier surface modification introduced late in the course of its preparation to ensure that Preparation of nanosized rutile TiO2 and modified continuously, thereby reducing the pre-dispersed in the traditional nano-powder before modification process, the surface modification of nano-TiO2 particles, improve the nano-TiO2 dispersed in the polypropylene polymer materials (polymer material modification). The main contents include the following aspects: (1) low-temperature preparation of nanosized rutile TiO2 using tetrabutyl titanate in the nitric acid solution prepared by hydrolysis of nanosized rutile TiO2, effects of moisture content in the reaction system, the concentration of nitric acid in the hydrolysis system, the reaction temperature, reaction time and other factors affect the crystal structure of TiO2, and homemade TiO2 with a commercially available the TiO2 product (Imperial Chemical Industries MT-500B) Structure and UV absorption properties of a comparative study. The results show that: water and tetrabutyl titanate molar ratio of 35, 4 mol / L nitric acid concentration, reaction temperature is 45 ℃, reaction time 5h, can be obtained pure rutile nano-TiO2 grains, the crystal particle size in the 70-100nm range; compared with commercially available products, homemade the TiO2 grains of surface reactive hydroxyl number more considerable UV absorption properties of commercially available products. (2) rutile TiO2 nanoparticles surface-modified silane A-151 as a surface modifier, late in the rutile TiO2 nanoparticles preparation of the surface modifier introduced to study a reasonable amount of surface modifier, and modification of TiO2 The microstructure and macroscopic properties of the particles were characterized. The results showed that: the hydrolyzate of the silane A-151 are polymerized to form Si-O-Ti chemically bonded with the surface hydroxyl groups of TiO2, when the A-151 and TiO2 molar ratio of 0.15:1, A-151 hydrolyzate in the graft quantity of the TiO2 surface chemotaxis saturated, the TiO2 and the water contact angle of up to 144 °, the dispersion stability can be obtained a substantial increase in the non-polar solvent (xylene), and still maintain a high UV absorption performance. (3) Polypropylene plastic UV aging resistance of modified mixing process will be homemade the TiO2 and polypropylene plastic composite, and pressed into a thin film samples in a homemade device accelerated aging. The ScS TiO2 dispersion, plastic, polypropylene and the characterization of the composite material film samples UV aging resistance performance carbonyl index. The results show that: the surface-modified TiO2 particles significantly improved dispersibility in plastics, polypropylene, TiO2 content is 2wt% polypropylene, UV-resistant aging properties.

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