Common knowledge of coating: cause analysis and preventive measures for deterioration of polyurethane waterproof coating

Core tip: any product has a shelf life After this shelf life, there may be deterioration problems So how to prevent the deterioration of polyurethane waterproof coating? First of all, let's understand the causes of deterioration of polyurethane waterproof coating ① The moisture content of the production filler is too high; ② Production operation process (including feeding sequence, reaction temperature and time, etc.) is out of control; ③ Diluent does not meet the requirements of urethane grade; ④ The coating packaging barrel leaks air and is mixed with moisture or moisture in the air; ⑤ Reactive active substances such as water, alcohol, acid, etc are accumulated in the packaging barrel Prevention and resolution 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: any product has a shelf life, after this shelf life may appear deterioration, so how to prevent polyurethane waterproof coating deterioration? First of all, let's understand the causes of deterioration of polyurethane waterproof coating ① The moisture content of the filler for production is too high; ② the production operation process (including feeding sequence, reaction temperature and time) is out of control; ③ the diluent fails to meet the requirements of ammonia ester level; ④ the coating packaging barrel leaks air and is mixed with moisture or moisture in the air; ⑤ there are reactive active substances such as water, alcohol and acid in the packaging barrel The methods to prevent and solve the deterioration of polyurethane waterproof coating are as follows: ① the specification of raw materials must meet the requirements of formula and process, and the moisture content of filler shall be strictly controlled; ② the production shall be conducted in strict accordance with the process conditions, and the feeding sequence, reaction temperature and time shall be controlled within the specified range; ③ the packaging management and storage conditions of products shall be well controlled Coating deterioration also occurs in the following cases The following small series will break once to help you analyze the causes and analyze how to prevent the following situations The phenomenon that a layer of hard coating is formed on the surface of the coating during storage is called skinning The reasons are as follows: ① the sealing of the coating packaging barrel is not strict or there are sand holes in the packaging barrel; ② the catalyst is used improperly or too much Prevention and solution measures to prevent coating from skinning: ① use appropriate catalyst during production and strictly control the amount of catalyst; ② seal the coating packaging barrel tightly to prevent air entry; ③ add anti skinning agents such as butanone oxime and cyclohexanone oxime The precipitated pigment and resin are divided into two distinct layers The phenomenon that the pigment in the bottom layer sometimes agglomerates and cannot be stirred is called precipitation The reasons are as follows: ① the viscosity of the paint is small, the amount of diluent is too large, and the resin content is small; ② the relative density of the pigment is large, and the particles are too coarse; ③ the wettability of the pigment is poor; ④ the storage time is too long Prevention and solution: ① add proper amount of common anti settling agent such as organobentonite; ② improve the fineness of pigment and add appropriate wetting agent for pigments and fillers; ③ regularly put the paint barrel upside down or horizontally during the storage process, mix the paint evenly before use, and use it within the specified time When hanging on the vertical facade, part of the paint flows down, resulting in a phenomenon similar to tears or curtain hanging Causes of sagging: ① low construction viscosity; ② too fast or too slow volatile solvent is selected The solvent with too fast volatility often volatilizes before the film is completely leveled, and the solvent with too slow volatility is selected, so the paint has a large fluidity on the vertical surface, which will form a tear point or curtain shape; ③ the construction site temperature is too low or the humidity is too high; ④ the paint contains too much heavy pigment, so the wettability of the pigment is not good; ⑤ the paint is too thick at one time, etc Measures to prevent sagging during coating construction: ① appropriately increase the amount of thickener; ② control the appropriate construction viscosity; ③ the construction environment temperature is preferably (20 ~ 30) ℃; ④ the coating should not be too thick at one time, which should not exceed 0.5mm; ⑤ adjust the volatility of diluent, and pay attention to the use of volatile fast and slow solvents 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,