Dioctyl adipate is generally synthesized under acid catalysis using adipic acid and ethylhexanol isooctyl alcohol as raw materials. There are many kinds of catalysts currently used to synthesize dioctyl adipate, which can be summarized into the following categories: inorganic acid catalysts, organic acid catalysts, titanate catalysts, and solid acid catalysts.
Among them, solid acid catalysts have the advantages of high catalytic activity, high selectivity, high temperature resistance, simple preparation, low pollution, and simple post-processing. They are a type of environmentally friendly catalysts with broad application prospects. Get people’s attention and attention. Therefore, using solid acid catalysts instead of other types of catalysts to catalytically synthesize dioctyl adipate has become a development trend in modern industry.
Dioctyl adipate is an excellent cold-resistant plasticizer for polyvinyl chloride. It gives the product excellent low-temperature flexibility, and has certain light and thermal stability and water resistance. The pressed and calendered products of dioctyl adipate show excellent lubrication properties during production, and the products have good hand feel. In plastisol, the initial viscosity is low and the viscosity stability is good.
DOA is usually used together with plasticizers such as DOP in cold-resistant agricultural films, wires, artificial leather, outdoor water pipes and packaging films for frozen foods. DOA can also be used as a plasticizer for many low-temperature rubber-containing plasticizers and resins such as nitrocellulose and ethylcellulose.
Dioctyl adipate is a typical cold-resistant industrial plasticizer with high growth rate and is widely used in sheet metal, artificial leather and other industries. Do you have any experience with its working principle? understood? Today I will introduce it to you.
1) When dioctyl adipate and resin are melted together, small molecules of the plasticizer will be inserted between the polymer molecular chains, weakening the bond between the polymer molecular chains. Gravity and the principle of action of plasticizers increase the distance between them. As a result, the possibility of movement of polymer molecular chains is increased, and the entanglement between polymer molecular chains is reduced, allowing the resin to be formed at a lower temperature. Glass transition, thereby increasing the plasticity of plastics.
It can be seen that the working principle of dioctyl adipate is that the attraction and entanglement between polymer molecular chains are a major reason for resisting plasticization.
2) The molecular structure of the polymer also affects the attraction between the polymer molecular chains, especially the properties of each group on the polymer molecular chain. The force between molecular chains with strong polar groups is large. , the force between molecular chains with non-polar groups is small. In order to make polymers with strong polar groups easy to shape, plasticizers can be added. The polar groups of dioctyl adipate will interact with the polymerization The polar groups interact with each other, thereby weakening the attraction between polymers, thereby achieving the purpose of plasticization.
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