SU140469A1 - The method of producing epoxy adhesives - Google Patents

Description

It is known that adhesives based on epoxy resins are distinguished by high quality: high bonding strength, ability to cure both in cold and heat, and stability of adhesive joints over time. Epoxy adhesives can glue a variety of organic and inorganic materials. However, the widespread use of these adhesives is still prevented by the lack of initial components for the synthesis of epoxy resins: diphenylolpropane and epichlorohydrin.

In order to expand the raw material base for the production of epoxy resins and improve the quality of adhesives based on them, an epoxy-polyester glue is proposed, which includes the main components: epoxy resin, obtained on the basis of combustible shale products, and TGM-3 polyether acrylate . The isolation of polyether acrylates drastically reduces the viscosity of the finished: composition, thereby improving its technological properties, and also allows you to introduce a larger amount of filler. Fillers reduce the ability of the glue to crack and bring its thermal expansion coefficient closer to the coefficients of the materials being glued. Active diluents, when cured, vortex into chemical interaction with the resin and contribute to the formation of a single product.

Example 1. To 100 kg of EPP-1 resin, 20 kg of polyether acrylate TGM-3, 20 kg of hardener — vat residue, methylimidiamine and 100 kg of cement were added. The resulting glue glued asbestos cement with asbestos cement under a pressure of 0.5 kg / cm and aged (under pressure) for 24 hours. The strength of glue

the splitting compound was more than 40 kg / cm, i.e. exceeded the strength of asbestos cement.

Example 2. Glue, prepared as described in example I, glued aluminum with aluminum. The strength of gluing on the shearing was thus over 70 kg / cm.

Instead of cement, aluminum powder, kaolin and other materials can be used as a filler. Comparative tests at different temperatures of the bonding strength of an aluminum alloy of the AB brand with epoxy polyurethane adhesives based on the usual epoxy resin ED-5 and epoxy resins ERG-1, EDF-11 and EDF-13, obtained from the products of processing of combustible shale, gave the following results:

As can be seen from the above data, the adhesive based on conventional ED-5 resin is cured for 3 days, while the adhesive based on ERG-, EDF-11 and EDF-13 resins obtained using combustible shale products - in 1-2 days . At the same time, the strength of gluing of aluminum with glue on ED-5 resin at 80 ° is almost equal to O, while the strength of gluing of aluminum with adhesives based on ERG-1 and EDF-11 resins at 80 ° is 10.4 and 25 kg. /cm.

Subject invention

The use of epoxy resin obtained on the basis of combustible shale products to obtain epoxy adhesives modified with polyether acrylates in order to expand the raw material base and improve the quality of adhesives.