The working principle and concept of dioctyl adipate

Dioctyl adipate is generally Adipic acid and ethylhexyl isooctyl alcohol are used as raw materials and are synthesized under acid catalysis. 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 an environmentally friendly catalyst with wide application prospects and have attracted much 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, 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 an understanding of its working principle? Today I will introduce it to you.

1) When dioctyl adipate and resin are melted together, small molecules that act as plasticizers will be inserted between the polymer molecular chains, weakening the attraction between polymer molecular chains and reducing the role of the plasticizer. The principle increases the distance between them, which increases the possibility of movement of polymer molecular chains and reduces the entanglement between polymer molecular chains, allowing the resin to undergo glass transition at a lower temperature, thus making the plastic plasticity increases.

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. Molecular chains with strong polar groups have a greater force, and those with non-polar groups have a greater force. The force between the molecular chains of dioctyl adipate is small. In order to make the polymer with strong polar groups easy to shape, a plasticizer can be added. The polar groups of dioctyl adipate will interact with the polar groups of the polymer. , thus weakening the attraction between polymers and achieving the purpose of plasticization.