Low-temperature wet cured primer, anticorrosive composite structure and method for preparing and constructing low-temperature wet cured primer

Abstract

The invention provides a low-temperature wet cured primer, an anticorrosive composite structure and a method for preparing and constructing the low-temperature wet cured primer. The method comprises the following steps: mixing 20-40 parts by weight of polyaspartic ester resin, 2-10 parts by weight of hexamethylene diisocyanate and 20-40 parts by weight of an organic solvent; reacting at 20-40 DEG C to obtain a secondary amino-terminated prepolymer at the end of the reaction; mixing the obtained secondary amino-terminated prepolymer with 10-20 parts by weight of diphenylmethane diisocyanate; reacting at 5-35 DEG C to obtain the low-temperature wet cured primer at the end of the reaction; coating the low-temperature wet cured primer on a construction base surface; and when the construction base surface is a wet base surface, reacting the low-temperature wet cured primer with moisture on the wet construction base surface to generate an adhesive substance beneficial for adhering the low-temperature wet cured primer to the wet base surface. The low-temperature wet cured primer provided by embodiments of the invention has excellent properties of easily controlled preparation process, strong adhesion force, low-temperature curability and the like.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a low-temperature moisture-curing primer, an anti-corrosion composite structure, and a method for preparing and applying a low-temperature moisture-curing primer. Background technique [0002] In building waterproofing engineering, polyurethane and polyurea are commonly used waterproof coatings. Polyurethane is a polymer material with urethane bonds formed by the chemical reaction of terminal isocyanate compounds and polyhydroxyl compounds; polyurea is a high polymer material with urea bonds formed by the reaction of terminal polyisocyanate compounds and terminal polyamine compounds. molecular material. [0003] Although the existing polyurethane and polyurea materials have waterproof properties and are often used in waterproof coatings, there are still deficiencies in the two waterproof materials of polyurethane and polyurea: the synthesis speed of polyurethane waterproof mat...

AI Technical Summary

Problems solved by technology

[0003] Although the existing polyurethane and polyurea materials have waterproof properties and are often used in waterproof coatings, there are still deficiencies in the two waterproof materials of polyurethane and polyurea: the synthesis speed of polyurethane waterproof materials is slow, the film-forming strength is low, Weak compressive capacity and poor adhesion, the formed waterproof layer cannot be firmly formed on the surface of the construction base, resulting in unstable structure of the waterproof layer and poor waterproof effect; the synthesis speed of polyurea waterproof material is too fast, and the reaction process is not easy Control and poor adhesion, usually need to be used in conjunction with primer materials such as epoxy resin, due to the high viscosity of the primer material, it is necessary to preheat the primer material before applying the primer material to strengthen the primer The fluidity of the material, however, the preheating operation of the primer material increases the construction steps and increases the construction cost, and when the polyurea waterproof material and the primer material are constructed, the construction speed of the two materials needs to be strictly controlled. If the construction speed is not strictly controlled, it will seriously affect the waterproof performance of the obtained mixture. Therefore, polyurea waterproof materials have higher requirements for construction equipment and construction operations.

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