CS208554B1 - Method of making the epoxy-amine aducts - Google Patents

Description

(54) A process for producing epoxy-amino adducts

The invention relates to a process for the production of epoxy amine adducts prepared by the reaction of epoxy resins with amines or polyamines, and is generally used as hardeners for epoxy sealants, adhesives and paints.

The processes used to prepare these adducts to date consist in mixing the reaction components in a duplicator kettle equipped with an anchor stirrer usually allowing abrasion of the viscous resin from the walls of the kettle and its complete homogenization with the present polyamine / amine. This procedure has two major disadvantages. The high viscosity of the mixed resin makes it necessary to use a robust mixer with a powerful motor, which is both investment and energy intensive. The rapid homogenization of the mixture achieved by this process leads to the initiation of a chemical reaction in the entire kettle volume at once, accompanied by the release of a large amount of heat. The reaction mixture must then be cooled or the epoxy component added in small portions.

The above drawbacks are overcome by the process according to the invention of homogenizing a mixture of epoxy resin, amine or polyamine and modifying ingredients in a rotating vessel.

Preferably, a vessel of cylindrical nature is used whose longitudinal axis coincides with the horizontal axis of rotation. The high-viscosity resin is carried upwardly by rotation of the vessel and forms a thin layer on its walls reacting with the solution of low-viscosity components. Homogenization proceeds more slowly and the required power input is only to a small extent determined by the starting viscosity of the resin or reaction mixture used. If the diameter and length of the container are of the same order, the resulting homogenization is nevertheless perfect. In addition, the inner surface of the container may be provided with protrusions or ribs, optionally arranged in a helical manner. An attractive variant is a process in which the reaction mixture is homogenized directly in the transport package.

The following example is illustrative and does not exhaust all the possibilities of the process according to the invention a closable cans in a 25 dm ³ is charged with 10 kg of diethylenetriamine is added and then 5 kg of epoxy resin modified dianbisglycidyléterového type of additive 20% dibutyl phthalate. The content of epoxy groups in the modified resin is 0.27-0.32 epoxy groups per 100 g of modification. The viscosity of the modified resin ranges from 25 Pa.s to 70 Pa.s at 25 ° C. After closing, the watering can is placed on a roller drive stand where it can be rotated. When the surface temperature of the watering can reaches its maximum and begins to decrease, the rotation is stopped and the watering can is allowed to cool. After adding an additional 5 kg of modified resin, the process is repeated. The resulting adduct has a viscosity of 8 Pa.s at 20 ° C and is directly applicable as a hardener for epoxy resins. It can advantageously be conveyed to the processing site directly in the can in which it was produced.

Claims (2)

SUBJECT A process for the production of epoxyamine adducts prepared by reacting epoxy resins with amines or polyamines, characterized in that the homogenization of the reaction mixture is carried out in a rotating vessel. OF THE INVENTION 2. A process for the production of epoxyamine adducts according to claim 1, characterized in that a ready-to-use adduct transport package is used as the rotating vessel.