To judge the quality of Rosin modified phenolic resin, the following aspects can be considered:
1. Appearance and color
First, observe the appearance and color of Rosin modified phenolic resin. High-quality resins usually have uniform and consistent colors, such as light brown transparent solids, and there are no obvious impurities or particles on the surface. The depth and uniformity of color can preliminarily reflect the purity of the resin and the stability of the synthesis process.
2. Technical index detection
Softening point: Softening point is an important indicator for measuring the heat resistance of resin. High-quality Rosin modified phenolic resin should have a higher softening point, usually greater than 135℃. The higher the softening point, the better the thermal stability of the resin, and it is not easy to deform or fail in a high temperature environment.
Acid value: The acid value reflects the content of free acid in the resin and is also an important indicator for evaluating the quality of the resin. Generally speaking, the lower the acid value, the better the quality of the resin. Because too high an acid value may affect the compatibility and stability of the resin with other materials.
Viscosity: Viscosity is a reflection of the fluidity of the resin, which has a direct impact on the processing performance and use effect of the resin. High-quality resins should have an appropriate viscosity range, neither too viscous nor too thin, so as to facilitate processing and use.
Non-volatile content (solid content): Non-volatile content reflects the proportion of active ingredients in the resin. The higher the solid content, the more active ingredients the resin has and the better the quality. The solid content is generally determined by the drying method, which needs to be operated in accordance with relevant standards.
Other indicators: such as solubility, fineness, gel time, etc. are also important indicators for evaluating resin quality. These indicators can be measured and analyzed by corresponding experimental methods.
3. Manufacturer Reputation and Certification
Choosing Rosin modified phenolic resin produced by well-known manufacturers is also an important way to ensure quality. Well-known manufacturers usually have advanced production equipment and strict quality control systems, and can produce resin products with stable and reliable quality. At the same time, paying attention to whether the manufacturer has passed relevant certifications (such as ISO certification) is also an important basis for judging the quality of its products.
In summary, judging the quality of Rosin modified phenolic resin requires comprehensive consideration of appearance color, technical indicator testing, manufacturer reputation and certification, etc.
