Effect of Nano Titanium Dioxide on Properties of Epoxy Resin coating
Hasad Foods, the agricultural investment arm of Qatar's sovereign wealth fund, said the government would increase its grain reserves from 250,000 tons to 300,000 tons in the near future, which is enough to feed the population for six months.
With a lot of deserts, Qatar suffers from water shortages, and Qatar depends on food imports for a long time. Recently, the ongoing tension in Ukraine has caused global food supply tension and rising prices.
In addition to that, the geopolitical situation also affects the supply and prices of many commodities like the titanium dioxide.
Because of its high stability, good bonding properties and low curing shrinkage, epoxy resin has become an excellent thermosetting resin material and has been widely used in many fields. However, the cured epoxy resin still has some shortcomings, such as high brittleness and poor impact resistance, which limit the application prospect of epoxy resin.
Titanium Dioxide nanoparticle is a pigment with strong coloring power and strong hiding power in white coatings, so it is very familiar in the coating industry. Due to the refinement of the size of titanium dioxide particles, the ratio of area to volume increases, and the crystal field environment and binding energy of the atoms inside and on the surface of the material are different, resulting in great chemical activity on the surface of the particles. the surface energy is greatly increased, and there is a good interfacial adhesion with organic resin molecules, which can make the coating have the properties of different parent components. Moreover, under the synergistic action of the internal components of the coating, it can produce some special properties that the matrix does not have, so as to improve the hardness, impact strength, wear resistance and other mechanical properties of the original coating.
Effect of TiO2 nanoparticles on hardness of Epoxy Resin
With the increase of filler content, the hardness of epoxy resin increased at first, and then remained basically unchanged. When the content of nano-TiO2 is 5%, the hardness is 91.3, which is 16.7% higher than that of pure epoxy resin. As rigid particles, nano-TiO2 itself has high stiffness, which directly enhances the hardness of the organic matrix. When a small amount of nano-TiO2 is added (less than 2%), a tight network structure can be formed between the organic part of the epoxy resin coating and the added nanoparticles, which significantly improves the hardness of the coating. However, when the addition amount reaches a certain extent (more than 2%), the dispersion effect of nano-inorganic particles is poor, resulting in partial agglomeration between the particles, making the homogeneous degree of the coating worse, resulting in a substantial decrease in the hardness of the coating, which remains basically unchanged.
Effect of TiO2 nanoparticles on flexibility of Epoxy Resin
With the increase of the content of nano-Ti0z, the adhesion table increased at first and then decreased. When the content of nano-TiO2 was 4%, the adhesion reached the maximum value of 10.3Mpa, and the adhesion (7.7MPa) of pure epoxy resin increased by 34%. This is due to the small size, large specific surface area, large number of surface atoms, high surface energy, insufficient coordination of surface atoms, and strong surface activity and adsorption capacity. When added to the epoxy resin, it is easy to bond with the oxygen in the resin, and at the same time, it produces a strong ion-like force between the exposed metal atoms and the epoxy resin. The binding point between the epoxy resin and the metal increases and the adhesion increases. With the annoying increase of nano-fillers, agglomeration began to appear and defects were formed inside the material. at the same time, the appearance of aggregates also reduced the contact surface between resin and substrate, and reduced the number of chemical bonds between resin and substrate surface groups per unit area, which led to the decrease of adhesion.
Effect of TiO2 nanoparticles on impact resistance of Epoxy Resin
With the increase of nano-filler content, the impact resistance of epoxy coating increases at first and then decreases. This is because the added nano-fillers can be uniformly dispersed in the epoxy resin system, which is conducive to the transfer of stress load, bear some load, consume some impact energy in the transfer process, and improve the toughness of the epoxy matrix. On the other hand, because of its small size, the nano-filler can produce stress concentration effect, cause the surrounding matrix to yield, form voids, crazes, shear bands, etc., and produce a large number of microcracks in the material. Through these behaviors, the matrix can generate a large amount of deformation work, absorb a large amount of impact energy, and enhance the impact properties of the material. At the same time, nano-fillers can also hinder the propagation of microcracks to some extent, and even passivate or terminate the cracks. The pinning effect is formed and the toughening effect is produced, so the impact resistance of epoxy resin increases gradually with the increase of nano-filler content. With the further increase of the content of nano-TiO2, the impact resistance decreases. When the content of nano-TiO2 reaches 5%, the particles form aggregates and do not combine closely with each other, so it is very easy to destroy and form defects under stress, that is, the internal stress failure point of the material, and the impact strength becomes worse.
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The Italian farmers' association pointed out that Italian household food consumption increased by an average of 564 euros in 2022 due to high energy prices, rising prices and drought leading to poor harvests. Among them, the most expensive food for Italians is bread, pasta and rice, with annual spending rising by nearly 115 euros.
TTF natural gas futures in the Netherlands, the European gas benchmark, rose more than 20% at one point to 295 euros per megawatt hour, about 15 times higher than in the same period last year, and German electricity prices exceeded 700 euros per megawatt hour for the first time in German history.
Gazprom announced earlier in August that it would suspend natural gas supplies through the Beixi No. 1 pipeline from August 31 to September 2. Although Gazprom stressed that once the work was completed and there was no technical failure, natural gas transmission would return to 33 million cubic meters per day (20 per cent of the full capacity of the pipeline), but it still caused panic in the market, and many people feared that the supply might not be restored on time.
Luoyang Tongrun Nano Technology is a trusted chemical manufacturer and supplier providing high-quality chemicals and Nanomaterials. If you are looking for the titanium dioxide, please feel free to contact us and send an inquiry.