Paint knowledge - Introduction to water-based rust coating

Core tip: in modern home decoration, many building materials are metal, which are easy to react in the air, such as rust Rust corrosion causes a lot of waste of resources, so some measures should be taken to reduce the rust of building materials At this time, water-based rust coating will come into use Waterborne rust paint is mainly a mixture of waterborne resin emulsion and filler particles dispersions It has a good function of rust prevention Next, Xiaobian will introduce the knowledge about waterborne rust paint The water-borne rust coating includes stable water-borne rust coating, conversion water-borne rust coating and permeable water-borne rust coating 1、 Stable waterborne rust coating Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Paint Home News: in modern home decoration, many building materials are metal, which are easy to react in the air, such as rust Rust corrosion causes a lot of waste of resources, so some measures should be taken to reduce the rust of building materials At this time, water-based rust coating will come into use Waterborne rust paint is mainly a mixture of waterborne resin emulsion and filler particles dispersions It has a good function of rust prevention Next, Xiaobian will introduce the knowledge about waterborne rust paint The water-borne rust coating includes stable water-borne rust coating, conversion water-borne rust coating and permeable water-borne rust coating 1、 The stable waterborne rust coating relies on the active pigment in the coating To stabilize the rust layer, there is a slow solid-phase reaction process between the active pigment and the rust layer Generally, it takes 8-10 months to make the rust layer completely stable, but the water solubility of the active pigment is relatively large, and the base material is the reactive resin to stabilize the rust Because the resin molecules contain high polarity carboxyl, hydroxyl, phosphoryl, etc., they have a strong wetting effect and strong hydrophilicity In view of the above reasons, the primer is not well protected, early damage may occur, and the purpose of stability cannot be achieved In order to solve this problem, it is very important to apply the intermediate protective layer on the primer for sealing The stable waterborne rust coating based on alkyd resin is suitable for steel parts on water The results of salt water, salt spray and air exposure test show that this kind of rust coating can catch up with and surpass the red lead and Iron Red Antirust Paint of the same paint The thickness of rust layer after surface treatment before painting can be controlled below 30-50 μ m according to the variety formula In order to ensure the quality, it is better to apply two coats by hand The interval between layers is 24h, but the longest time is not more than 2 weeks The stable water-borne rust coating based on epoxy ester has good adhesion to steel It can be applied on steel plate with rust layer thickness of 40-70 μ m, and on steel surface without rust and oxide skin It has been used in domestic aircraft steel parts with temperature below 280 ℃ This kind of water-borne rust coating has wide requirements on the construction surface and wide application It is not as strict as the conversion type of water-borne rust coating Generally, it does not contain phosphoric acid or other acid conversion agents Therefore, it can be used on the steel surface with uneven corrosion and solid oxide skin or old paint film During construction, it can be used as a primer directly without covering another layer of primer of other models 2、 Conversion type water-borne rust coating conversion type water-borne rust coating is applicable to the steel surface with uniform corrosion and no oxide skin and flake thick rust (the old paint film shall be removed for repair and recoating), which is characterized by fast function and timely application of antirust primer and finish paint, so as to play a good protective role The relationship between the thickness and uniformity of rust layer and the quantity of conversion solution should be paid attention to when using conversion water-borne rust coating According to the different thickness of the rust layer, the ratio of conversion solution and film-forming solution can be adjusted to make the conversion agent in the rust layer react best, so as to avoid potential harm If there is more rust and less conversion liquid, the conversion is not complete On the contrary, acid medium remains in the paint film, which causes corrosion under the film This kind of defect is especially easy to occur on the surface with uneven distribution of rust layer Adding corrosion inhibitor (such as thiourea, etc.) can improve it The transformation solution is mainly for loose rust reaction, which can not be firmly combined with the metal bottom, and the lattice constant of the phosphate passivation layer is relatively large In addition, the hydrogen evolution effect, so the adhesion is not very good The problem of film embrittlement also exists with tannic acid, and the coating matching coating is easy to cause early local blistering and other problems During construction, if there is old paint on the surface, it should be removed with a shovel It is better to use brush coating method Do not repeat the application, only apply one layer, otherwise it will cause free acid surplus and affect the quality of the coating It must be pointed out that when this kind of coating is used, it must be covered with a layer of other types of primer, and then applied with intermediate paint and finish paint, otherwise it will seriously affect the anti-corrosion effect of the whole coating 3、 Permeable waterborne rust coating Because this kind of coating has good permeability, it is suitable for the old but less chemically polluted steel equipment surface, especially for the riveted and bolted parts of the equipment, the use of it has a good effect, and can play a protective role that is difficult to achieve by the general coating When the permeability of the coating itself is relative, when there are impurities with high activity in the rust, or It is difficult to penetrate the thick rust layer completely, and its permeability is greatly limited, so it is not easy to seal all the rust, which may lead to continuous corrosion, and to some extent, it also affects the adhesion with the metal foundation surface At this time, it must be cleaned, otherwise it will still lead to the occurrence of rust, affecting the rust prevention effect of the whole coating Construction method and coating dosage, viscosity and curing speed of coating, temperature of coating and substrate, thickness of rust layer, etc all directly affect the penetration depth of coating to rust layer Brush coating is conducive to the penetration of the coating on the rust layer The above is about the type of water-based rust coating and construction precautions I hope you will know something after reading Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,