Fumed silica, as an important inorganic non-metallic material, plays a pivotal role in the coating industry. It can not only significantly improve the thickening thixotropy and dispersibility of coatings but also enhance comprehensive properties such as weather resistance and wear resistance of coatings. However, for a long time,China's fumed silica market has been faced with the problem of import dependence. Therefore, developing fumed silica products with independent intellectual property rights and realizing domestic substitution are of great significance for enhancing the core competitiveness of China's coating industry.

Against this background, the research, development and application of domestic fumed silica HCSIL-151 have become an important direction to break through the "bottleneck" technologies and realize import substitution. Based on the comparative experimental data between HCSIL-151 and foreign competitor B, technicians from Huifu Nano systematically analyzed the differences between the two in terms of viscosity thixotropic behavior, dispersibility and adaptability to high addition amounts, and revealed the unique advantages of HCSIL-151 in controlling the balance between sagging and leveling, optimizing the dispersion process, etc. This provides theoretical support and practical reference for the large-scale application of domestic materials in UV coating systems, and helps the industry achieve the goals of cost reduction, efficiency improvement and independent and controllable supply chains.HCSIL-151 and foreign competitor B were added into UV wood coatings, and the particle fineness under different addition amounts was compared to explore the dispersion properties of hydrophobic fumed silica in coatings. The data shows that under the addition amounts of 0.5% and 2.0%, the scraper fineness of HCSIL-151 is consistent with that of foreign competitor B. At the addition amount of 1.0%, the scraper fineness of foreign competitor B is less than 5μm, while that of HCSIL-151 is between 5-10μm, so the competitor has an advantage; at the addition amount of 1.5%, the scraper fineness of foreign competitor B is between 25-30μm, while that of HCSIL-151 is between 10-15μm, so HCSIL-151 has an advantage. It can be seen that although the two perform differently under different addition amounts, their overall dispersibility is basically the same.Then, HB-151 (presumably HCSIL-151) and foreign competitor B with different addition amounts were fully dispersed in UV wood coatings, and their viscosity and thixotropy at different rotation speeds were tested with instruments.

  As the addition level of HCSIL-151 increases from 0 to 2.0%, the thixotropic performance of the coating shows an upward trend, and the viscosity also gradually increases under both 6R and 60R test conditions. This indicates that HCSIL-151 can effectively enhance the thickening and thixotropic properties of UV wood coatings. Its microscopic particle structure forms a physical cross-linking network in the coating system, which hinders the flow of the coating, thereby increasing viscosity and thixotropy. This makes the coating less likely to sag during application and better able to maintain a uniform film thickness.Foreign competitor B also exhibits enhanced thixotropic performance with increasing addition levels, and the viscosity under 6R and 60R conditions also rises. However, the comparison shows that under the same addition level, HCSIL-151 brings a relatively greater improvement in the coating's thixotropic performance, meaning that HCSIL-151 may have better effects in terms of thickening and thixotropy, and can provide better application stability for the coating.

   This paper compares the thickening thixotropy and dispersibility of HCSIL-151 and foreign competitor B in UV wood coatings through experiments. The results show that both perform excellently in terms of thickening thixotropy, but HCSIL-151 may have better performance in improving the thixotropy of coatings. In terms of dispersibility, both exhibit good dispersibility at low addition amounts, but at high addition amounts, the dispersibility of foreign competitor B deteriorates more significantly.Therefore, in practical applications, appropriate fumed silica products can be selected according to specific needs. For UV wood coating formulations requiring high thixotropy and good dispersibility, HCSIL-151 may be a better choice. Meanwhile, it also provides strong support for domestic substitution, which is conducive to the rise of domestic material research, development and production capabilities. Promoting domestic materials to replace imported products in more fields will help China's manufacturing industry move towards the middle and high end of the global industrial chain and write a new chapter for Chinese materials.