Adhesive solvents: They refer to liquids that can reduce the intermolecular forces of certain solids or liquids, enabling the dissolved substances to be dispersed into a homogeneous system of molecules or ions. Commonly used solvents are liquid substances with low viscosity. They mainly include aliphatic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, esters, alcohols, ketones, acids, ethers, terpenes, amides and water. However, most organic solvents have a certain degree of toxicity, flammability, explosiveness, cause pollution to the environment, pose potential safety hazards and are harmful to the human body.
Selection of adhesive solvents:
① Polarity: Select a solvent with the same or similar polarity as the base material (based on the principle of "like dissolves like").
② Solubility parameter (related to polarity): The solubility parameter of the solvent should be similar to that of the polymer matrix.
③ Volatility of the solvent: Select a solvent with appropriate volatility or a mixture of fast and slow volatile solvents. If the solvent volatilizes too quickly, a film is likely to form on the surface of the adhesive liquid, and the solvent under the film is difficult to volatilize. If the solvent volatilizes too slowly, the surface drying time will be prolonged, affecting work efficiency.
④ When selecting a solvent, factors such as price, toxicity and source should be taken into consideration.