What is epoxy soybean oil plasticizer, What is its mechanism of action?
Plasticizer, also known as plasticizer, It is a polymer material additive added to polymer materials to increase their plasticity. It is an additive that increases the flexibility of materials or liquefies them. Its added object includes plastic, concrete, Wall material, Cement and gypsum, etc. The same plasticizer is often used on different objects, But their effects are often not the same. There are over a hundred types of plasticizers available, But the most commonly used is a group of compounds called phthalates.
The main function of plasticizers is to weaken the secondary bonds between resin molecules, Increase the mobility of resin molecular bonds, Reduce the crystallinity of resin molecules, Increase the plasticity of resin molecules, Enhance its flexibility, Easy to process. Plasticizers typically have polarity or partial polarity in their structure, It has a high boiling point, A liquid or low melting point solid that is difficult to volatilize and has good miscibility with polymers. Plasticizers are distributed between large molecular chains, Can reduce intermolecular forces, Reduce the melting temperature and viscosity of the polymer melt, Thereby reducing its molding processing temperature: And make polymer products flexible, Elasticity and low temperature resistance performance.
The plasticization process in plastics can be seen as the process of low molecular weight compounds of resin and plasticizer dissolving into each other, But plasticizers are different from general solvents, The solvent will evaporate during the processing, And plasticizers require long-term retention in the polymer, And it does not react chemically with the resin, Forming a solid plasticizer with resin after processing. Can increase the flexibility of plastic, Flexibility and tortuosity, Cold resistance and elongation, Reduce the hardness of plastic, modulus, Glass transition temperature, melting point, Softening temperature or flow temperature, Reduce the viscosity of plastic, Increased liquidity, Thus improving the processing performance.
The plasticizing mechanism of plasticizers, It is generally believed that there are two types:
1) The molecular structure of polymers also affects the attraction between polymer chains, Especially the properties of each functional group on the polymer molecular chain, Molecules with strong polar groups exhibit high intermolecular forces, Molecules with non-polar functional groups have low intermolecular forces, In order to facilitate the molding of polymers with strong polar groups, Can process plasticizers, The polar groups of plasticizers will interact with the polar groups of polymers, Thereby weakening the attraction between polymers, This also achieves the purpose of plasticization.
2) When plasticizers melt together with resins, The small molecules of plasticizers will be inserted between the polymer molecular chains, Weakened the bow force between polymer molecular chains, Increased the distance between them, The result increased the possibility of polymer molecular chain movement, Reduced entanglement between polymer molecular chains, Enable resin to undergo glass transition at lower temperatures, Thereby increasing the plasticity of plastic. thus it can be seen, The attraction and entanglement between polymer molecular chains are a major reason for their resistance to plasticization.
