Good compatibility means that additives (such as solvents, plasticizers, etc. ) can exist stably and uniformly in the system for a long time. Poor compatibility, liquid resin will appear delamination phenomenon. If the sediment of plastic products is solid, it is called "frost spraying", and if it is liquid, it is called "sweating", which will affect the quality and appearance of products.
In the dye industry, the compatibility of different dyes in the dyeing process is also called compatibility.
When the interaction energy between two polymers is greater than that between their own molecules, heat can be released when they are mixed, so the two polymers are completely compatible in thermodynamics, and vice versa. Experiments show that most rubber absorbs heat when mixing, or the mixed thermal effect is close to zero, which is incompatible, except for a few polymers, such as natural rubber mixed with high styrene resin, carboxyl rubber, vinyl pyridine rubber and so on. Generally speaking, the closer the solubility parameters of two substances are, the better their compatibility is. In mathematics, in a formal logic system, its compatibility means that there is no contradiction, or more accurately, there are no propositions P, P and non-P that can be proved in this system.
In the numerical calculation of differential equations, if the length of each partition tends to zero, the constructed difference equation can be completely close to the original differential equation, which is called the compatibility of difference schemes. When the adhesive sealing material comes into contact with other materials, physical and chemical changes that affect the adhesiveness of the adhesive sealing material will not occur.