Coating technology: coating and formulation design of epoxy floor coating

Core tips: 1 Introduction Modern industrial floor requires dustproof, impervious, corrosion-resistant, compression resistant, washable, etc epoxy floor coating is widely used because of its good physical and mechanical properties, excellent chemical resistance, smooth and clean surface, strong decoration, which can meet the requirements of modern industrial floor The base material of the floor is usually concrete, and its surface is covered with pores The pores contain water and alkaline substances If it is painted directly without treatment, the paint film will not only have poor adhesion, but also have blistering, cracking, whitening and even delamination In order to avoid the above problems and extend the service life of the coating Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and The modern industrial floor requires dust-proof, anti-seepage, corrosion-resistant, pressure resistant, washable, etc the epoxy floor coating is widely used because of its good physical and mechanical properties, excellent chemical resistance, smooth and clean surface, strong decoration, and can meet the requirements of modern industrial floor The base material of the floor is usually concrete, and its surface is covered with pores The pores contain water and alkaline substances If it is painted directly without treatment, the paint film will not only have poor adhesion, but also have blistering, cracking, whitening and even delamination In order to avoid the above problems and extend the service life of the coating, besides controlling the moisture content of the substrate and carrying out the correct surface treatment, it is also necessary to design the coating formula and construction process correctly 2 construction preparation 2.1 base inspection and treatment base inspection include the measurement of concrete moisture content, flatness, pH value and strength Line height: 25px; ">45cm × value="45" tcsc="0" unitname="cm" w:st="on" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; line-height: 25px; "> 45cm plastic film shall be placed on the surface of concrete After sealing the four sides with adhesive tape for 16 hours, water drops appear under the film or the surface of concrete turns black, indicating that the concrete is too wet to be painted Relative humidity measurement method: a box is tightly sealed on the concrete surface, and the humidity in the box is measured 24 hours later When the air temperature value = "21" TCSC = "0" unitname = "℃" W: St = "on" style = "margin top: 0px; margin right: 0px; margin bottom: 0px; margin left: 0px; padding top: 0px; padding right: 0px; padding bottom: 0px; padding left: 0px; word wrap: break word; line height: 25px; "> 21 ℃, the relative humidity is 75%, and when the moisture content of concrete is 5%, it neither absorbs nor desorbs water When the measured humidity value is greater than 75%, the moisture content of concrete is greater than 5% Radio frequency test method: determine the moisture content by measuring the difference of radio waves transmitted and received through concrete Determination of calcium chloride: it is an indirect method to determine the rate of water escaping from concrete X; "> 46.8g/m 2 2.1.2 the moisture content of the excluded concrete shall be less than 5%, otherwise the coating can only be carried out after the moisture is removed There are several ways to remove water: ventilation: strengthen air circulation, accelerate air flow, remove water, and promote the further volatilization of water in concrete Heating: improve the temperature of concrete and its surrounding air, accelerate the rate of water transfer to the surface of concrete, and make it evaporate rapidly Forced air heating and radiation heating should be used The combustion products (including water) generated by heating directly with fire source will increase the temperature of air mist point and cause the water to condense on the concrete, so it is not suitable to use Reduce the dew point temperature in the air: use dehydration and dehumidifier, dehumidifier or introduce outdoor air (the dew point of the introduced outdoor air is lower than the temperature of the concrete surface and above) to remove the water vapor in the air 2.2 base course surface treatment method for flat ground, the following methods are commonly used: acid pickling method (applicable to the ground with a lot of oil): clean the concrete surface with hydrochloric acid with a mass fraction of 10-15%, after the reaction is complete (no more bubbles), wash with clean water, and brush with a brush This method can remove the mud layer and get a finer roughness Mechanical method (applicable to large area): sand blasting or electric grinder shall be used to remove surface protrusions, loose particles, damage pores, increase adhesion area, and vacuum cleaner shall be used to remove sand, impurities and dust For the ground with many depressions and potholes, the epoxy resin mortar or epoxy putty shall be used for filling and repairing before the next operation The performance of the treated concrete base shall meet the following indexes Table 1 qualified concrete base indicator coating home is focused on coating, diatom mud, paint coating, coating process, news and information of fire retardant coating and coating, diatom mud, paint coating, coating process, decoration knowledge and decoration effect diagram of fire retardant coating,