Common knowledge of paint: the influence of paint brush quality on latex paint coating and Countermeasures

Core tip: at present, there are three main types of brushes sold in China's building materials market: natural bristle brush, which is usually the most suitable for solvent coating, especially for the coating and finishing of enamel The natural mane is hollow, can absorb 50% of its own weight of water, and expand, soften and bend easily Therefore, the natural bristle brush is not suitable for the coating of water-based coating Wool brush is used for water-based paint It is used for wall paint and wood paint Because the manufacturing investment of brush industry is small and the technology is simple, a large number of inferior wool brushes are flooding the market Synthesis 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 Paint Home News: at present, there are three main types of paint brushes sold in China's building materials market: natural bristle brush, which is usually most suitable for the coating of solvent based paint, especially for the coating and finishing of enamel The natural mane is hollow, can absorb 50% of its own weight of water, and expand, soften and bend easily Therefore, the natural bristle brush is not suitable for the coating of water-based coating Wool brush is used for water-based paint It is used for wall paint and wood paint Because the manufacturing investment of brush industry is small and the technology is simple, a large number of inferior wool brushes are flooding the market Synthetic brushes, made of synthetic materials such as nylon or polyester, are mostly used for water-based paints In North America, construction workers generally use high-quality synthetic paint brushes The quality of paint brush directly affects the coating effect of emulsion paint The quality of paint brush has a great influence on emulsion paint There are a lot of problems in the manufacture of brushes, such as the lack of strict technology, such as boiling, degreasing, bleaching and cleaning, which will lead to the poor quality of a considerable number of brushes, not only containing a lot of calcium and magnesium ions in the bristles, but also containing a lot of acid substances In the process of construction, a large number of water-soluble high valence metal ions and hydrogen ions enter the latex paint system, breaking the balance of latex paint system, resulting in flocculation of the main components of latex paint, such as the double layer failure of emulsion particles, resulting in coating particles, which seriously affect the appearance and performance of the paint film We usually call this phenomenon sluggish brush or sticky brush Many components in latex paint will cause sluggish brush due to the use of inferior brush These ingredients include: 1 Emulsion 2 which is mainly relied on electrostatic repulsion, 3 dispersant containing anionic group, 4 surfactant containing anionic group, alkali swelling and thickening agent and hydrophobic alkali swelling and associating thickener The quality of the paint affects the development of latex paint industry Some coating manufacturers take passive and passive measures against the current situation that the market of inferior paint brush is overflowing They invested a lot of manpower and material resources to change the components of the coatings, but the poor quality brushing tools were used to carry out the construction operation After the phenomenon of stagnation appeared, the quality of the emulsion was attributed to it It has been proved that all these changes and adjustments are at the expense of some properties and functions of latex paint For example, choose low-grade emulsion stabilized by non electrostatic repulsion For example, stable emulsion of hydroxyethyl cellulose and stable emulsion of non-ionic surfactant However, the hydrophilicity of these emulsions is strong, which will adversely affect the water resistance, stain resistance, washability and gloss of the final coating The emulsion that depends on some strong electrolyte groups is selected The sensitivity of these emulsions to cations is low, but the performance of the final film will still be worse Some dispersants with strong electrolytes are used For example, sodium polyacrylate salt water pigment dispersant, non-ionic surfactant, etc are used, otherwise, the filler will flocculate Association type polyurethane thickener was used Polyurethane thickening has a strong association effect on emulsion, hindering the attack of high valent cations on latex particles, and obviously improving the stability of latex paints on brushes Choose the appropriate powder system to further reduce the ion content of powder As the saying goes: three paint, seven construction Good painting tools, correct construction methods, skills, good substrate treatment and good primer are far more important than high-quality finish In order to completely eliminate the lag of emulsion paint and obtain a perfect painting project, we summarized the following precautions and construction techniques: 1 Actively advocate the use of artificial polyester, nylon brush or high-quality wool brush to avoid problems from the source A good brush, in hand, should have a good feeling: not slippery, not rough, comfortable When choosing paintbrush, we should pay attention to the following points: (1) the quality of wool brush is the best when choosing sheep tail hair and adopting single and even technology (2) The tip of the bristle can buckle to a certain extent and can easily bounce back to its original shape (3) The size, type and quantity of brushes purchased shall be commensurate with the scale of the works Generally speaking, the size of the brush should be both The bristles can be in the shape of flat head, tip or angle It depends on whether there are some special shapes in the project 2 Master the correct brush use method and minimize the generation of sluggish brush Many coating suppliers will write the correct construction procedures in the instructions: put the new brush into clean tap water for soaking and wetting before use, generally 10 to 15 minutes The ideal way is to soak the brush with 1% washing powder in tap water (hot water is better) Our research shows that as long as the correct procedure is used, most of the harmful substances in the brush will be diluted, and the lag phenomenon will be greatly reduced This method is simple and easy When the brush is dipped in the paint, the brush can reach at most half of the length of the brush, preferably 1 / 3 of the length After dipping in the paint, touch the tank wall with the brush tip several times to make the paint full without dripping When painting, the brush angle shall be 45 ° relative to the painting surface When constructing walls and ceilings, the brush shall be vertical, with a long stroke and a light touch to the wall When painting wood, brush along the lines When painting oily paint, it is necessary to brush back to improve the appearance of paint film, but when painting emulsion paint, especially semi gloss or gloss paint, do not brush back The construction latex paint requires thick film and good covering power, which can be brushed cleanly and finish after a few times, so as to achieve good effect At present, there are no national or industrial standards and specifications for brush quality in the whole brush industry Paint manufacturers, brush manufacturers, associations, and relevant government departments should work together to purify the brush tool market, formulate relevant specifications and standards, so that the brush industry and paint industry can have a healthy development The home of coatings is focused on the news and coating of coatings, diatom mud, paint coating, coating technology, fire retardant coating, diatom mud, paint coating, coating technology, Decoration knowledge and effect drawing of fireproof coating,