Modified epoxy resin composite coating for building exterior walls, and preparation process thereof

Abstract

The invention discloses a modified epoxy resin composite coating material for a building external wall. The modified epoxy resin composite coating material comprises the following components in partsby weight: 55-62 parts of a bisphenol F epoxy resin, 21-24 parts of hydrophobic porous energy storage ore microspheres, 1.2-1.3 parts of sodium bicarbonate, 12-15 parts of hollow glass balls, 8-11 parts of titanium dioxide, 6-9 parts of hydroxyl silicone oil, 5-8 parts of nano-zinc oxide, 47-58 parts of formaldehyde, 24-27 parts of phenol, 1.3-1.8 parts of a dispersing agent, 0.9-1.2 parts of a leveling agent, 2.3-2.7 parts of an antifoaming agent and 100 parts of ethanol. According to the invention, a plurality of hydrophobic porous energy storage ore microspheres are uniformly distributed inthe whole network structure of the molecules of the coating prepared by the preparation method disclosed by the invention, the siloxane groups on the branched chains on the surfaces of the hydrophobic porous energy storage ore microspheres have certain hydrophobic capacity, the hydroxyl formed after hydrolysis of the siloxane bonds and the hydroxyl in hydroxyl silicone oil are cross-linked through hydrogen bond interaction to form a hydrophobic net, and the whole hydrophobic net covers the surface of the coating material, so that the coating material has high hydrophobic capacity, and the hydrophobic groups are fixed through chemical bonds so as not to change the hydrophobic performance due to long-term corrosion of the coating.

Description

technical field [0001] The invention belongs to the field of paint preparation, and relates to a modified epoxy resin composite paint for building exterior walls and a preparation process thereof. Background technique [0002] In order to maintain the comfort of the interior and the beauty of the wall, many existing building exterior walls are coated with a layer of paint, which can not only achieve an aesthetic effect, but also achieve the effect of light reflection by adding hollow glass spheres to the paint The thermal insulation effect of the wall, but the indoor thermal insulation effect is not ideal in winter. At the same time, in the rainy season in the south, the wall is easily peeled off by the erosion of rainwater, which not only affects the beauty of the wall, but also makes the wall more durable. The heat insulation effect is reduced. The existing waterproof coating directly adds a waterproof agent to the coating. After a long period of erosion, rainwater enters ...

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Problems solved by technology

[0003] The object of the present invention is to provide a kind of modified epoxy resin composite coating for building exterior wall and its preparation technology, this coating is to carry out hole making after carrying out coating modification with discarded slag powder, at the same time in the prepared coating The pores of the slag-coated microspheres are filled with energy storage materials, and the branched chains on the surface of the coated slag microspheres are polymerized and grafted, so that the branched chains contain a large number of hydrophobic groups, siloxane groups and amino functional groups. The epoxy group on the bisphenol F epoxy resin has a ring-opening reaction, so that the adjacent hydrophobic porous energy storage ore microspheres are connected to form a network structure through the upper phase of the bisphenol F epoxy resin, and part of the formaldehyde will Amino cross-linking makes a small network structure inside the large network skeleton, which can realize the fixation of hollow glass spheres, titanium dioxide, hydroxyl silicone oil and nano-zinc oxide fillers. Part of the formaldehyde directly reacts with phenol, and the formed polymer has a certain Excellent bonding performance, which can further fix hollow glass spheres, titanium dioxide, hydroxyl silicone oil and nano-zinc oxide fillers. The liquid paraffin in the inner core of hydrophobic porous energy storage ore microspheres has energy storage function, and at the same time, the outer network structure The nano-zinc oxide also has a certain energy storage effect, and the hollow glass spheres in the external network structure have heat insulation properties, so that the entire paint skeleton has a certain energy storage and heat insulation effect inside and outside, which can not only achieve sun protection in summer. It can realize heat insulation in winter, and at the same time, due to the effect of cross-linking and fixed coating, the energy storage material will be reduced during the long-term erosion of the coating, so that the heat insulation performance will not be reduced. It solves the problem of adding hollow glass spheres to existing coatings. The light reflection effect of the glass ball realizes the heat insulation effect of the wall, but the indoor insulation effect is not ideal in winter. At the same time, in the rainy season in the south, the wall is easily peeled off by the erosion of rainwater, which not only affects the wall. The beauty of the wall reduces the heat insulation effect of the wall

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