A preparation method of an anti-corrosion organic silicon binder for the inner lining of desulfurization chimneys in thermal power plants

Abstract

The invention relates to a preparing method for a corrosion prevention organic silicon binding agent for a desulfurization chimney liner of a thermal power plant. The preparing method comprises the following steps that firstly, a first component is prepared, wherein hydroxyl-terminated polydimethylsiloxane, polyethylene glycol PEG 600, a defoaming agent, a coupling agent and a solvent a are added into a reaction kettle according to a certain proportion and stirred evenly, then inorganic filler is added multiple times with a small amount, vacuum stirring is carried out for 60 minutes under the condition of the vacuum degree of 0.08 MPa, and the first component of the binding agent is obtained; secondly, a second component is prepared, wherein the curing agent polyisocyanate, a catalyst and a solvent b are added into a reaction kettle according to a certain proportion and stirred evenly, and the second component of the binding agent is obtained; thirdly, the first component and the second component are blended at the mass ration of 20:1 at the room temperature and stirred evenly, and the organic silicon binding agent is obtained. The organic silicon binding agent prepared through the method is high in binding performance, excellent in strong acid and strong base corrosion resistance, and good in high-temperature aging resistance and high-low temperature alternating resistance.

Description

technical field [0001] The invention belongs to the field of chemical industry, and specifically relates to a preparation method of an anti-corrosion organic silicon binder used for the lining of desulfurization chimneys of thermal power plants. Background technique [0002] The flue gas emitted by coal-fired power plants contains a large amount of dust, SO 2 , NO x Pollutants such as SO 2 It is the main pollution source of PM2.5 and acid rain, which seriously endangers human health. With the implementation of the new national environmental protection policy, new and existing thermal power plants must carry out flue gas desulfurization. The wet limestone desulfurization process has been used in thermal power plants Dominant in the exhaust gas purification device. After the flue gas is desulfurized, although the SO in the flue gas 2 The content of SO is greatly reduced, however, the method of scrubbing can remove a small amount of SO in the flue gas 3 The effect is not g...

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Problems solved by technology

[0003] The patent CN201210284643.4 published by Deng Yuqiang and others provides a desulfurization chimney anti-corrosion coating method, which consists of fluoroelastomer, solvent, filler and additives dissolved, dispersed and mixed in a certain proportion as component A, curing agent and solvent After being mixed in a certain proportion, it is used as component B, and components A and B are stirred and mixed in proportion to obtain an anti-corrosion coating, which has excellent performance, but the cost is high and the promotion is limited; the patent CN201310362114.6 of Lei Musheng et al. introduced a A silicone adhesive used for anti-corrosion of the inner wall of a desulfurization chimney has good acid resistance, but its curing time is long and the construction performance is not good; the patent CN201310047939.9 of Zhao Shiqi et al. introduces a two-component polyurethane adhesive for anti-corrosion of chimneys, which has High bonding strength, good toughness of the cured product, and excellent acid resistance are the characteristics, but the high and low temperature alternating performance needs to be improved; the patent 201010290484. However, due to the high hardness of silicone resin and the need for heating and curing, it obviously cannot meet the construction environment and curing conditions of the inner wall of the chimney.

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