When poly(methyl methacrylate) lubricant additives are combined with other additives, there may be challenges in terms of compatibility, performance balance, and cost control. The specific issues are as follows:
Compatibility challenge
The chemical structures and properties of different additives vary greatly, which may lead to mutual reactions or incompatibility. For instance, when polymethyl methacrylate is combined with certain metal detergents, a chemical reaction may occur, affecting the performance of the additives and even causing precipitation or flocculation, blocking the oil filter and reducing the lubrication effect. 6 Moreover, polymethyl methacrylate is a highly polar polymer, and if it is combined with non-polar additives, problems such as uneven dispersion may arise due to the difference in polarity, thereby affecting the overall performance.
Performance balance challenge
When multiple additives are present together, the functions of each component may interfere with each other, making it difficult to achieve a balance in terms of dispersion, antioxidant properties, or viscosity regulation. For instance, the tackifying property of polymethyl methacrylate may be overly suppressed by the dispersant, affecting the high-temperature shear stability. At the same time, in order to achieve multi-effect synergy, the compounding ratio needs to be finely controlled, increasing the technical difficulty. In terms of cost control, the preparation process of high-purity polymethyl methacrylate is complex. When used in combination with other high-end additives, the overall cost significantly increases, limiting its application in the mid-to-low-end market.
Challenge of High Temperature Stability
Under high temperature and high shear conditions, the poly methyl methacrylate lubricant additive itself may undergo degradation, thereby affecting its performance. When combined with other additives, this process may be accelerated. Additionally, the chemical reactions produced by other additives at high temperatures may affect the stability of poly methyl methacrylate, leading to problems such as decreased lubricant cleanliness.
Molecular weight matching issue
Take the combination of polymethyl methacrylate and poly-α-olefin as an example. The molecular weights of the two substances have a significant impact on the compounding effect. If the molecular weights do not match, it may affect their mutual solubility, fail to effectively enhance the oil film strength, and be difficult to achieve the expected performance improvement effects such as anti-friction and wear resistance.
Collaborative challenges in anti-wear performance
In vehicle transmission system oils with low viscosity and ultra-low viscosity, when polyacrylate is used alone, the oil film strength is insufficient. When combined with anti-wear additives, if they cannot effectively cooperate, it is difficult to provide sufficient anti-wear protection for the friction pair under harsh conditions such as high load and high speed, and it is unable to meet the requirements of equipment for lubrication performance.
