Synthesis method of tackifying alkylphenol formaldehyde resin

Abstract

The invention provides a synthesis method of tackifying alkylphenol formaldehyde resin. The synthesis method comprises the following steps: firstly, adding alkylphenol and an acidic catalyst into a reaction still; secondly, slowly adding 65 to 80 percent of the total amount of formaldehyde aqueous solution after the temperature is raised to 50 to 60 DEG C; carrying out reflux reaction for 1 to 3 hours and steaming out all water, then stopping distillation, slowly adding the remaining formaldehyde aqueous solution and steaming out the water; thirdly, after the reaction time is ended, raising the temperature to 140 to 160 DEG C; distilling out residual water and unreacted alkylphenol in a vacuum state; fourthly, distilling out entrained water and the unreacted alkylphenol, and drying an organic phase by distilling; adding water into the reaction still for washing, separating out a water phase and drying the organic phase to obtain a product disclosed by the invention. According to the preparation method disclosed by the invention, acidic ionic liquid is used as a solvent and a catalyst and replaces the acidic catalyst and the solvent in the synthesis method of the traditional alkylphenol formaldehyd resin, so that the extensive use of organic solvents is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of phenolic tackifying resin, in particular to a synthesis method of green and high-efficiency tackifying alkylphenolic resin. Background technique [0002] Lamination method is often used in the production of radial tires and bias tires. It is required that the surface of unvulcanized rubber must have a certain viscosity or initial adhesion. Therefore, self-adhesiveness is very important in the molding process, so it is also called molding viscosity. If there is a lack of viscosity between the rubber materials, especially for synthetic rubber compounds, the semi-finished rubber parts will not only creep to deform the dimensions, but also cause the adhesive parts of the rubber parts to come off due to the expansion during molding. In the product design of all-steel radial tires, thin films with good viscosity are used in many places such as the bead part and the belt layer. If there is no sticking phenomenon...

AI Technical Summary

Problems solved by technology

However, the following problems exist in the synthesis process of alkylphenol-formaldehyde resins: in the synthesis process, a relatively toxic organic solvent is often required, which pollutes the environment; the acidic catalyst in the product is difficult to remove, which affects the performance of the resin

[0004] In the traditional synthesis method of alkylphenol-formaldehyde resin, when alkylphenol and formaldehyde are mixed, the condensation reaction that occurs at first is the same phase reaction, and then as the reaction proceeds, the reaction system is divided into two phases: resin phase and water phase, and phenolic formaldehyde Condensation intensifies the separation of the two phases of the reaction solution, thereby hindering the progress of the reaction, resulting in low product yield and high free phenol content in the product, etc.

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