A kind of epoxy resin waterproof coating for hydraulic engineering and preparation method thereof

Abstract

The invention discloses an epoxy resin waterproof coating for hydraulic engineering and a preparation method thereof, comprising component A and component B, wherein component A comprises the following components in parts by mass: hydrogenated bisphenol A epoxy resin 40 ~60 parts, 10~20 parts of polyurethane modified epoxy resin, 10~15 parts of epoxy resin toughening agent, 15~20 parts of diluent, 3~5 parts of coupling agent, 0.01~0.08 parts of dispersant No. 1, Carbon black 0.1~0.2 parts, defoamer 0.2~0.5 parts, titanium dioxide 5~8 parts, dispersant No. 2 0.01~0.08 parts, sericite powder 5~8 parts, fumed silica 1~2 parts, antioxidant Auxiliary 1010 is 0.1~0.8 parts, anti-ultraviolet additive UV‑327 is 0.2~0.5 parts; component B includes the following components in parts by mass: 5~10 parts of polythiol curing agent, 3 parts of alicyclic amine curing agent ~5 parts, accelerator 0.3~0.5 parts, stop flow agent 0.1~0.3 parts. The epoxy resin waterproof coating for hydraulic engineering of the invention has high mechanical properties, anti-aging performance, no yellowing, good toughness and good frost resistance, and is suitable for waterproof protection of hydraulic structures in severe cold regions.

Description

technical field [0001] The invention relates to the field of chemical products, in particular to an epoxy resin waterproof coating for hydraulic engineering and a preparation method thereof. Background technique [0002] In recent years, extreme weather has occurred more and more frequently, which puts forward higher requirements for the waterproof protection of hydraulic structures, especially the waterproof protection of hydraulic structures in the severe cold region of northwest my country is particularly important. Although in nearly 20 years of research, we have developed high-strength polyurethane waterproof coatings, two-component spray polyurea waterproof coatings, polyurethane (urea) waterproof coatings, and hand-brushed polyurea (single and two-component) waterproof coatings. , High elongation at break coatings to try to solve such problems, two-component spray polyurea waterproof coating, hand-brushed polyurea (single, two-component) waterproof coating is the best...

AI Technical Summary

Problems solved by technology

Although in the past 20 years of research, high-strength polyurethane waterproof coatings, two-component spray polyurea waterproof coatings, polyurethane (urea) waterproof coatings, and hand-brushed polyurea (single and two-component) waterproof coatings have been developed. , high elongation at break coatings in an attempt to solve such problems, two-component spray polyurea waterproof coatings, hand-brushed polyurea (one-component, two-component) waterproof coatings have the best effect, but it is also found during use There are some problems, mainly in the fast curing of two-component quick-setting spray polyurea, poor penetration and wettability of the base layer, high requirements for the base layer, especially the treatment of a large number of concrete base layers, which is prone to defects

In addition, the internal stress of the material is large, and the edges are prone to curling and falling off; hand-brushed polyurea (single- and two-component) waterproof coatings have high requirements for the construction environment, and when the base surface is wet or the ambient humidity is high, pinholes and bulges are prone to occur. , low wet bond strength, peeling phenomenon

[0003] Epoxy resin waterproof coatings have low requirements on the base surface, and the dry and wet base surfaces are well bonded. However, the existing epoxy resin coatings are greatly affected by temperature due to rigidity and aging problems such as brittleness, easy yellowing, and easy chalking. In winter, the construction viscosity is high, it is not easy to construct, the pigments and fillers will settle, delaminate, float and bloom, and the elongation at break is small, so it cannot be adapted to the general displacement and deformation of concrete, and cannot be adapted to the field of waterproof protection of hydraulic structures.

[0004] Patent CN104293266A in the existing patents introduces a shock-resistant epoxy impregnated glue and its preparation method. It has certain impact resistance and aging performance, but there is no test for tensile strength and elongation at break. It is a sealant. Used for building structure sealing; patent CN 105237955 A introduces one of bisphenol AD ​​epoxy resin, hydrogenated bisphenol AD ​​epoxy resin, hydrogenated bisphenol A epoxy resin, hydrogenated bisphenol F epoxy resin One or several kinds of epoxy resin, polyetheramine or alicyclic amine as the curing agent prepared epoxy resin coating as the matrix resin of UAV carbon fiber reinforced advanced composite materials, has a high tensile strength (> 60MPa), tensile strength Elongation modulus (>2.7GPa), high temperature (140~160°C) baking or outdoor use without powdering, no yellowing, but the elongation at break is low ( 35 ° C in summer and low temperatures - 5 ° C in winter It maintains a long service life under a wide temperature range of ℃, which is convenient for construction and fast curing. It overcomes the shortcomings of poor toughness of conventional epoxy anti-corrosion coatings, but the toughness still cannot meet the requirements of hydraulic standards. Analysis from the selected raw materials , will appear yellowing, aging phenomenon

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