Building strengthening epoxy type edhesive and its preparation method

Abstract

An epoxy adhesive for reinforcing building is composed of epoxy resin (A) and solidifying agent (B). Said solidifying agent is prepared through heating polaymine to 50-80 deg.C, stirring while adding the mixture of epoxy compound and acrylonitrile, reacting for 3-6 hr, heating to 100-130 deg.C, adding urea and thirourea compound, vacuumizing for 30-120 min, cooling to 15-60 deg.C, and adding thiol and silane. Said epoxy adhesive is prepared through mixing A with B. Its advantages are high adhesion, high shear, tension and impact strength, and wide temp range.

Description

Technical field: [0001] The invention relates to an epoxy resin adhesive and a preparation method thereof in the field of fine chemicals, in particular to an epoxy adhesive that can be applied to crack repair in building reinforcement and maintenance, steel reinforcement, carbon fiber reinforcement, steel bar anchoring, etc. its preparation method. Background technique: [0002] With the rapid development of the construction industry, the economic loss caused by the damage of concrete structures caused by various reasons is staggering. Therefore, in the past ten years, the repair and renovation of various concrete structures have experienced outstanding growth. In foreign countries, such as In the United States, Canada, Japan, etc., their engineering volume has accounted for more than 50% of the entire construction business activities. In China, the amount of renovation and maintenance projects has also increased sharply, especially bridges, high-rise buildings and other pr...

AI Technical Summary

Problems solved by technology

Polysulfide-toughened rubber-toughened epoxy resin adhesive has poor bonding strength and a strong pungent smell, making it extremely inconvenient to use

In addition, the addition of the above two toughening agents reduces the activity of the epoxy resin, slows the curing, prolongs the curing time, and incomplete curing

Recently, a new type of flexible polyester resin has been reported as a toughening agent for epoxy resin adhesives (Tian Xinhe, The hardening and toughening of epoxy resin, thermosetting resins, 1987 (4), Na Bing, New type of epoxy resin toughening agent Synthesis and Research of Toughening Agent, Adhesion, 2002 (4)), the polyester toughening agent reported above also has the disadvantages of slow curing at room temperature and incomplete curing.

In addition, the currently used plasticizers are all added to the epoxy resin component. The toughening agent has a large molecular weight, which reduces the reactivity of the epoxy resin component, so that the adhesive is not completely cured at room temperature.