About water-based paint

Compared with solvent-based paint, water-based paint has the following characteristics:: l． Using water as solvent saves a lot of resources ； Eliminates fire risk during construction ； Reduce air pollution ； Only a small amount of low-toxic alcohol ether organic solvents are used, which improves the working environment conditions. The organic solvent of general water-based coatings (accounting for coatings) is between 10% and 15%, while the current cathodic electrophoretic coatings have been reduced to less than 1.2%, which has a significant effect on reducing pollution and saving resources. 2． Water-based coatings can be applied directly to wet surfaces and humid environments ； It has good adaptability to the material surface and strong coating adhesion. 3． Painting tools can be cleaned with water. * * Reduce cleaning solvent consumption. 4. The electrophoretic coating film is uniform and smooth. Good flattenability ； The inner cavity, welds, corners, and edge parts can be coated with a certain thickness of coating film, which is very protective. ； Electrophoretic coating has the best corrosion resistance, and the salt spray resistance of thick film cathodic electrophoretic coating can reach up to 1200h. 1． Water-based coatings have high requirements on the cleanliness of the construction process and the surface of the material. Due to the high surface tension of water, dirt can easily cause shrinkage holes in the coating film; 2. Water-based coatings have poor dispersion stability against strong mechanical forces. When the flow rate in the transportation pipeline changes sharply, the dispersed particles are compressed into solid particles, causing pitting on the coating film. The transportation pipeline is required to be in good shape and have no defects in the pipe wall. 3． Water-based coatings are highly corrosive to coating equipment and require the use of anti-corrosion linings or stainless steel materials, resulting in high equipment costs. Water-based coatings corrode transportation pipelines, dissolve metal, precipitate dispersed particles, and cause pitting in the coating film. Stainless steel pipes are also required. 4. Baking-type water-based coatings have strict requirements on construction environmental conditions (temperature, humidity), which increases the investment in temperature and humidity control equipment and also increases energy consumption. 5. The latent heat of evaporation of water is large, and baking energy consumption is large. Cathodic electrophoretic coatings need to be baked at 180°C ； Latex paint, on the other hand, takes a long time to dry completely. 6． Organic cosolvents with high boiling points produce a lot of fumes during baking, which condense and drip on the surface of the coating film, affecting the appearance. 7. Water-based coatings have the problem of poor water resistance, which results in poor stability of the coating and bath liquid, and poor water resistance of the coating film. The medium of water-based coatings is generally slightly alkaline (PH7.5 ~ pH8.5). The ester bonds in the resin are easily hydrolyzed and the molecular chains are degraded, which affects the stability of the coating and bath liquid, and the performance of the coating film.

The so-called solvent-based paint is what we call paint in the traditional sense. The difference between water-soluble and solvent-based paints 1. Advantages of water-soluble latex paint: It has less harmful odor, so it is suitable for repainting or places that have been used. ； It can be cleaned with water and soap. It does not need to be combined with dangerous and flammable solvents. There is no need to use solvents to clean up after construction. ； It dries quickly and can be re-coated quickly, so it is especially suitable for areas already in use. ； Water-soluble latex paint has strong UV resistance, so it remains safe in places exposed to sunlight. Alkyd and oil-based paints absorb solar radiation and cause the paint film to break quickly. ； Water-soluble latex paint films, especially white, sub-white and pink paint films, are not prone to yellowing over time. ； Water-soluble latex paint has good air permeability and allows a small amount of water vapor to pass through the paint film, so it can reduce the possibility of bubbles. This is important when painting lightly damp surfaces ； Water-soluble latex paint has better gloss and long-lasting color, so it can maintain a new surface. ； The water-soluble latex paint film has good elasticity and can expand and contract with the substrate, so it is not prone to cracks and peeling over time. 2. Advantages of solvent-based coatings Solvent-based coatings do not have high requirements for painting conditions and can be applied in a wide range of temperature and humidity. (But the surface is still required to be dry to enhance adhesion) ； Solvent-based paint has a thicker consistency and is not easy to flow. ； Solvent-based paint has good leveling properties, smooth paint film, and few brush lines or rolling lines. (This advantage is reduced with alkyd paints with low VOC content) ； Solvent-based coatings have strong surface penetration, especially for exposed wood, which can increase their adhesion and surface protection capabilities. ； Oil-based paint adheres better to smooth surfaces ； Solvent-based paint has a brighter and more dazzling luster. (But its luster is also easy to lose over time) ； The paint film of solvent-based paint is harder. (But it is also easy to become brittle) 3. The difference between solvent-based and water-based floor paints. There are currently two categories of hand-brushed floor paints.: Solvent-based paint and water-based paint. Dosage paints mostly use xylene as a solvent. When the xylene evaporates, floor paint is formed. This paint contains xylene and formaldehyde. Painted floors require a longer period of ventilation to evaporate residual xylene, which is very harmful to the human body. ； One is water-based paint. Water-based paint uses water as a solvent. After the water evaporates, a paint film is formed. It does not contain xylene, formaldehyde and other substances. It is a very environmentally friendly floor paint. You can move in the next day after painting. 　　The disadvantage of solvent-based polyester paint is that it contains free organic isocyanates, which can cause asthma and be harmful to health. ； Not scratch-resistant, cannot be used on cork floors, and difficult to paint over the original paint surface ； In most cases, you can only paint once a day ； Use solvent to clean painting tools, the paint surface will easily turn yellow. 　　 The advantage of water-based floor paint is that it is non-toxic and solvent-free ； It is easy to repaint on the original paint surface without turning yellow. ； You can apply paint 3 times a day and it dries quickly ； More wear-resistant and more environmentally friendly than solvent-based ； Better maintain the true color and texture of wooden floors ； Convenient construction, no need to move for construction ； Painting tools are washable ； Products are divided into glossy, matt and semi-matt, with a variety of options available. Paints are divided into two types: water-based paints and solvent-based paints. The main cause of pollution is solvent-based paint, and using environmentally friendly water-based paint can completely eliminate worries about paint pollution. Zhu Chuan, an expert from the China Coatings Industry Association, believes that any solvent-based coating will contain 50% or more organic solvents. The first factor causing toxicity is naturally organic solvents. 　 Most wall paints on the market currently use water-based paints, but solvent-based paints are still widely used in wood paints for furniture. Like most solvent-based coatings, water-based coatings are also composed of base materials, volatile components, pigments, fillers, additives, etc. (inorganic water-based coatings are slightly different). The base material is also called the connecting material. As the name suggests, it is used as a base material to connect other substances and can form a continuous film attached to the substrate. The biggest difference between water-based paints and solvent-based paints is the use of water as the main volatile component. For areas requiring reduced VOC emissions, water-based coatings are undoubtedly the best choice. Pigments and fillers are dispersed and suspended in the base material to provide color, covering, filling, anti-corrosion, etc. If it contains no or very small amounts of pigments and fillers, it is called varnish. An additive is a functional material that is used in a small amount but can change some properties of the coating, such as ； Defoaming agent, leveling agent, dispersing agent, etc. Most coatings are not limited to the components mentioned above, but are complex mixtures that can be combined in infinite combinations and applications. However, the design principle of the formula is to use limited materials and limited time to test a coating that can meet certain performance requirements. %uQ k' ； The other is latex coatings or emulsion coatings. Generally refers to the dispersion of polymer particles in water produced by emulsion polymerization. Generally the solvent content is relatively small. Of course, there are many new types of water-based paints that cannot simply be named by an old name, and there are more and more different types of mixtures. It is not necessary to rigidly apply a name, and it can be applied flexibly in actual applications. Coatings can be divided into varnishes, colored paints, metallic flash paints, etc. according to their appearance. According to their functions, they can be divided into anti-corrosion coatings, high-temperature-resistant coatings, decorative coatings, wear-resistant coatings, etc. And can be divided into organic coatings and inorganic coatings. Water-based paints also have these classifications. Coating is usually translated as coating, and paint is generally translated as paint. The corresponding water-based coatings are water-borne coatings, which generally refer to various water-based coatings. Water-based paints are generally water paints (of course there are other translations, please refer to the paint dictionary for details). In life, we will hear some painters call water-based latex paint paint, while oil-based wood paint is called paint. This classification is not very scientific and is only suitable for the construction and home decoration industries. In fact, paint is paint and paint is paint. There is not much difference in meaning between the two. They are just new and old terms. Generally, the meaning of paint is broader and more literal. Similarly, the word coating is more widely used, while paint generally refers to coatings used in construction and home decoration. Correspondingly, water-based paint is basically the same.

Thank you for your insight. I am a water-soluble polymer manufacturer and want to switch to water-based coatings. I don’t know if it is feasible.

Water-based paint dries slower than oil-based paint, and the construction process is more troublesome than oil-based paint, but it is more environmentally friendly.

Any coating that uses water as a solvent or dispersion medium can be called water-based coatings. Water-based paints include three types: water-soluble paints, water-dilutable paints, and water-dispersible paints (latex paints).

I would like to ask if water-based paint dries very slowly after use? What about solvent-based paint? Is the molecular weight of the film-forming substance relatively low? From the comparison of the evaporation rate of the solvent inside, it can be concluded that the water-based paint should dry slower than the solvent paint after use. There is no generalization about whether the molecules of the film-forming substance are high or low.