Application of redstone nano-titanium dioxide in vehicle coatings (2)

2 Results and discussion
2.1 nanometer titanium dioxide on the effect of paint weather resistance weather resistance is an important indicator of vehicle coatings, poor weather resistance of coatings in the sun's ultraviolet radiation can easily cause color change, loss of light and other aging phenomena. NTG-602B nano-titanium dioxide can not only scatter and reflect ultraviolet light (full wavelength of 200 to 400 nm), but also absorb ultraviolet light, so its ability to shield ultraviolet light is very strong. The hydrometer test shows that NTG-602B nano-titanium dioxide has a very strong UV shielding effect, with a UV shielding rate of 320 to 400 nm, a 90% UV shielding rate of 290 to 320 nm, and an UV shielding rate of 200 to 290 nm. Therefore, the addition of NTG-602B nano-titanium dioxide to the coating can improve the anti-ultraviolet properties of the coating.test will be made of sample 1, sample 2, sample 3 light blue acrylic metal drying paint samples in accordance with GB 1765 artificial accelerated aging test method and 1.5.1 natural exposure aging test method for UV weather resistance comparison test. By table 2 artificial accelerated aging and natural exposure aging two test results can be found that samples containing NTG-602B nano-titanium dioxide 3 film color change, minimal loss of light, the strongest resistance to UV weather; Sample 2 film color change, loss of light is more serious than sample 3, anti-UV performance is second, sample 1 film without anti-UV agent is the most serious, UV resistance is the worst. It can be seen that the addition of NTG-602B nano-titanium dioxide in the coating can reduce or reduce the destructive power of photochemical effects on the coating film, extend the life of the coating film, and enhance the weather resistance of the coating film. At the same time, the light blue acrylic metal drying paint with different contents of nano-titanium dioxide was selected for 800 h artificial accelerated aging test to observe the effect of NTG-602nm titanium dioxide on the weather resistance of vehicle coatings, the results of which can be found in Table 3.From Table 3, it can be seen that NTG-602nm titanium dioxide is of great help to improve the weather resistance of light blue acrylic metal drying paint, with the increase of NTG-602B nano-titanium dioxide addition, the coating film after artificial aging to produce loss of light, color change phenomenon decreasing, because nano-titanium dioxide has the effect of ultraviolet absorption, scattering function.
2.2 NTG-602B nano-titanium dioxide has an important effect on coating hardness and adhesionNTG-602B nano-titanium dioxide is a non-qualitative white powder with a particle size of ≤20 nm, which is more than 40m2/g than the surface area, and is analyzed by scanning electron microscope, which presents a floc-like and mesh quasi-particle structure (see Figure 1), with small particle size. The singular properties of nano-titanium dioxide are related to its high surface activity and large surface area, on the one hand, there are a large number of polar groups on the particle surface can form a strong interface binding force between the resins in the coating, on the other hand, the nanoparticle size of titanium dioxide in the coating in a highly orderly arrangement can fill the gap between the coating film, so that the coating film is more dense, which helps to improve the hardness of the coating and other mechanical properties. From table 2 pencil hardness, adhesion project test data can be seen: sample 3 due to the addition of NTG-602B nano-titanium dioxide, its pencil hardness of 2H, adhesion for 1 level, and sample 1, sample 2 hardness is H, adhesion is 2 levels, relatively speaking, the addition of NTG-602B nano-titanium dioxide on the paint hardness, adhesion will be significantly improved.2.3 Effect of NTG-602B nano-titanium dioxide on coating viscosityDue to the highly active surface area of NTG-602, a strong interaction with film and solvent can be found in Table 2, adding NTG-602B nano-ii The viscosity of titanium oxide sample 3 is higher than that of sample 1, sample 2 without NTG-602B nano-titanium dioxide, the viscosity of the coating increased, the fluidity decreased, which is very conducive to aluminum silver paste, pearl powder in the process of coating film orientation, improve the effect of color with the angle, increase the metal sense of the coating film. At the same time, it can effectively avoid the precipitation quality problems of aluminum silver paste and pearl powder in the coating during storage.3 Conclusion (1) NTG-602 redstone nano-titanium dioxide has a very strong absorption and scattering function to ultraviolet light, can effectively shield ultraviolet rays, protect the coating film from its destruction, improve the weather resistance of the coating film.(2) NTG-602 redstone nano-titanium dioxide can form a strong interface binding force with the resin in the coating, improve the hardness of the coating film, adhesion and other properties.(3) NTG-602 redstone nano-titanium dioxide has a large, highly active surface area, with film-forming objects and solvents to form a strong interaction, can greatly improve the fluidity of the coating, used in vehicle coatings can effectively improve the metal flash paint with angle color effect and prevent pigment precipitation.