• Water-based paint knowledge base-Wood bumps
    Water-based paint knowledge base-Wood bumps

    2019-04-18

    Wood bumps - Common problems with water paint Wood grain is exposed when broken or damaged wood comes into contact with water.A good example of this is when a curved toothpick is placed in water, it will draw water through the capillaries, elongate, and straighten.When the fibers on the board are exposed, they suck water into the wood like a straw, causing the fibers to swell and stick to the surface. Woodiness processing is having main effect to grain protuberance. Plywood made with a blunt saw blade has more damaged wood fibers and has a "fuzzy" feel to the surface.Hardwoods with pipe holes often have wood ridges in the wooden pipe-holes . Red oak usually has triangular wood grain protuberance sometimes, wood fiber two ends join in board surface, and among protuberance, form an inverted "V" wood grain protuberance.Such ridges are very difficult to remove.Sanding is merely a temporary flattening of the wood fibers.When the next layer of water-based paint is applied to the wood surface, the wood fibers will resurface.A more effective method is to use a hard brush or wire brush to remove wood fibers or pipe holes before painting. Although ridges are almost impossible to remove, we can add some steps to the recipe to reduce the occurrence of ridges.One way is to use a saturated coating. A typical saturated coating is a transparent coating of 3-4% adhesive solids.A typical saturated coating is a transparent coating of 3-4% adhesive solids.On the wood substrate, apply the saturated coating between any coating added.The effect of saturated coating is to cause grain process, and wood grain coagulation, so that wood grain in the saturated coating drying can not relax.Next, gently polish to remove the worst grain. Scotchbrite, by Scotchbrite, is the preferred tool for this type of sanding because it is not good for breaking more wood. A quick-drying coating can also help reduce ridges.A quick film-forming or water-based coating that removes water quickly can limit water intrusion into the wood fibers, thereby reducing the ridges.Sinograce Chemical of Special resin polymer for Acrylic Industrial coatings PF - 136 with a small particle size, good permeability, quick drying, etc, especially suitable for closed application of timber, effectively prevent because of the wood fiber water swelling and shrinkage problem.In addition, azeotropic solvents such as ethanol and isopropanol help to remove water from the coating. If such a method is used, care must be taken not to increase the formation of microbubbles while shortening the drying time. Additives that limit the flow of water and prevent it from entering the substrate will naturally reduce ridges. Compared with other thickeners, alginate, CMC and HEC really thicken the water, rather than reacting with polymers and pigments, and have no effect on thickening the continuous phase of the coating. Finally, the best way to prevent ridges is to use a hybrid system, which is a combination of water-based and solven...

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  • Water-based paint knowledge base-Water-based wood paint runs off oil
    Water-based paint knowledge base-Water-based wood paint runs off oil

    2019-04-16

    Water-based wood paint runs off oil---Ask a water paint expert Question: Waterborne wood lacquer should run oil to a rainy day only, or brush one day, also can run oil when waiting for the 2nd day to brush again, did especially ugly later .Water-based white paint does not have this problem. The problem of water-based varnish is obvious. Answer: Although it is a water-based paint, the film is hydrophobic. Brush the water-based paint on the water-repellent paint mold to remove oil due to water wetting. White paint does not have this phenomenon, because white paint is relatively thick surface. Solutions include: 1.Reduce the surface tension to a certain extent to reduce the smoothness of the film surface. 2.Do not use fluorinated surfactants. 3.Try to use a surfactant with good hydrophilic properties. 4.Pay attention to the HLB value

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  • Water-based paint knowledge base-Leveling and rheological properties of waterborne coatings
    Water-based paint knowledge base-Leveling and rheological properties of waterborne coatings

    2019-04-15

    Leveling and rheological properties of waterborne coatings Problem: water borne white coating wants to have certain rheological already, want to maintain just right leveling sex again, how to do? Response: This problem is one of the characteristics and technical characteristics of water based paint ,In principle, it is mainly the relationship between equilibrium viscosity and rheology (plasticity). In practice, the main solution is to choose the right thickener.Of course, the solid content of coating itself is also one of adjustable variables.In addition, the drying speed of the coating is another factor affecting the final leveling. The specific method can refer to the water - based formula library of Sinograce Chemical. For more information about waterborne coatings, you can also visit the waterborne coatings knowledge base of Sinograce Chemical  . It is Sinograce Chemical's goal to promote the development of waterborne paint in China. I hope you found the above explanation helpful.

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  • Water-based paint knowledge base-Baking performance of water-based glass paint
    Water-based paint knowledge base-Baking performance of water-based glass paint

    2019-04-12

    Baking performance of water-based glass paint - ask an expert for water-based paint. Question: I would like to ask about the water-based glass baking paint .Water has a boiling point of 100 degrees Celsius, so if you bake it at 140 degrees, it won't boil and bubble up and destroy the film. Right? Response: Water - based paint to balance the evaporation of water and film curing between the relationship .Usually because the film is thin(about 20 microns) .Basically, the water in the paint film evaporates almost before the temperature reaches 100C,and even if the temperature reaches more than 100C,Because the resin has not fully crosslinked, strong plasticity, can ensure the migration of water vapor,so usually the evaporation of water will not cause the bubble in the paint film . This point, water based paint and solvent-based paint no difference, many solvent-based paint baking has exceeded the boiling point of the solvent, but the bubble is the same principle to avoid . Of course,When the film thickness increases, this problem will be one of the factors considered in the process, which can be solved by adjusting the baking time and heating speed . For more information on water-based coatings, you can also visit Sinograce Chemical's waterborne coatings knowledge base,and our water based recipes. It is the goal of Sinograce Chemical to promote the development of waterborne paint in China. Hope the above explanation is helpful to you.

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