Flame-retardant glass flake daub for desulfurization corrosion prevention of thermal power plant and preparation method thereof

Abstract

The invention discloses flame-retardant glass flake daub for desulfurization corrosion prevention of a thermal power plant. The flame-retardant glass flake daub comprises, by weight, 40-60 parts of flame-retardant resin, 17-23 parts of glass flake, 1-2 parts f additive, 8-11 parts of modified aluminum silicate fiber, 6-8 parts of modified Nd2Zr207 ceramic powder, 5-7 parts of nanoscale titanium dioxide, 3-5 parts of flame retardant, 1-2 parts of coupling agent, 1-2 parts of solidifying agent and 0.6-1.3 parts of promoter, wherein the additive comprises a suspending agent and a defoamer according to a weight ratio of 2:1. By adding components like the modified aluminum silicate fiber and the modified Nd2Zr207 ceramic powder into glass flake daub, the defect that existing glass flake daub is low in binding strength and toughness, poor in impact resistance and short in service life is overcome; by combining flame-retardant characteristics of the glass flake daub itself and the flame retardant, the glass flake daub has excellent flame-retardant effect as a whole, flame-retardant grade reaches B1, oxygen index reaches 35, UL-94 is on grade V-0, and the flame-retardant glass flake daub is especially suitable for desulfurization corrosion preventive engineering of the thermal power plant.

Description

technical field [0001] The invention relates to the technical field of glass flake cement, in particular to a flame-retardant glass flake cement used for desulfurization and anticorrosion in thermal power plants and a preparation method thereof. Background technique [0002] Desulfurization glass flake cement for thermal power plants is mainly composed of vinyl ester resin, glass flakes, accelerators, pigments and additives. The layer has excellent permeability resistance to water, acid, alkali, some solvents and some other special chemical media, and the residual stress generated during the curing of the loose lining layer is dispersed through orderly dispersed scales, thus overcoming the traditional lining technology It is widely used in the absorption tower and flue of the flue gas desulfurization system. [0003] However, the most widely used vinyl resin glass flake cement has major deficiencies, such as low bonding strength, low toughness, poor impact resistance, and s...

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Problems solved by technology

[0003] However, the most widely used vinyl resin glass flake cement has major deficiencies, such as low bonding strength, low toughness, poor impact resistance, and short service life. Chinese patent CN106479327A discloses a vinyl ester resin glass flake Clay paint, this patent starts from the perspective of curing at room temperature, by adding a self-made low-shrinkage agent to the glass flake cement, the paint can effectively reduce the internal stress and increase the primer and substrate under the condition of maintaining a good heat-resistant temperature. The bonding strength greatly reduces the curing shrinkage rate, which effectively solves the problem of the flake cement lining falling off during the equipment application process. However, the main factor causing the low bonding strength of the glass flake cement is not only the above point, but only by reducing the curing shrinkage rate. way to solve the problem of low bonding strength, which obviously lacks aging stability. When the problems of low toughness and low impact resistance of glass flake cement are not solved, it is stimulated by various external factors (such as cold and hot Alternation, heat flow shock and other external factors), it is still easy to fall off, which leads to problems such as short service life

[0004] At the same time, the currently used vinyl ester resin glass flake cement does not have the function of flame retardancy. According to the actual use statistics, when a fire occurs in the absorption tower and clean flue of the flue gas desulfurization system of a thermal power plant, the coating The glass flake cement clothed in the lining burns due to the sharp rise in temperature, which aggravates the burning loss of the desulfurization equipment and causes large losses to the thermal power plant. Chinese patent CN106280285A discloses a flame-retardant glass flake cement. The main technical points are , by adding flame-retardant fibers and various additives, the oxygen index of the glass flake cement is improved, and the flame propagation speed is slowed down, and it has self-extinguishing properties. However, this patent still does not completely solve the burning problem of the glass flake cement. The added basic magnesium hydroxide and aluminum hydroxide flame retardants are easily corroded in the desulfurization corrosive environment of thermal power plants, and the flake cement is easily damaged. Moreover, this patent does not solve the low bonding strength and low toughness of glass flake cement , low impact resistance and other defects make it easy to fall off in pieces when encountering a fire, which greatly reduces the flame retardant effect

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