Coating knowledge: a good way to prevent deterioration of polyurethane waterproof coating

Core tip: any waterproof coating product has a shelf life After this shelf life, there will be problems So how to prevent polyurethane waterproof coating from deteriorating? First of all, understand why it will deteriorate, that is, the reason for deterioration 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 Prevention and solution: ① the specification of raw materials must meet the requirements of formula and process, and the content of fillers shall be strictly controlled Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Coating home news: any waterproof coating products have a shelf life, after which there will be problems, so how to prevent the deterioration of polyurethane waterproof coating? First of all, understand why the deterioration, that is, the cause of deterioration 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 Prevention and solution: ① the raw material specification must meet the formula and process requirements, and strictly control the moisture content of the filler; ② the production shall be strictly in accordance with the process conditions, and the feeding sequence, reaction temperature and time shall be controlled within the specified range; ③ the product packaging management and storage conditions shall be well controlled 2 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 4 During the construction of flow hanging on the vertical facade, part of the paint flows downward, resulting in a phenomenon similar to tears or curtain hanging, which is called flow 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 the occurrence of hang up during the construction of coatings are: (1) increasing the dosage of thickening agents; (2) controlling the suitable construction viscosity; (3) the construction environment temperature is preferably (20~30) C; 4 The coating should not be too thick at the same time, and not exceed 0.5mm; 5 Adjust the volatilization speed of the diluent, and pay attention to the collocation of volatile fast and slow solvent [pay attention to the official account of WeChat public "; Pay attention to the surprises Scan the code to see "what will happen if swallows and wumeiniang come to sell coatings?" paint network exchange group: 92525666] paint home is focused on the news and coatings of coatings, diatom mud, paint paint, paint process, fire retardant coatings, diatom mud, paint, paint process, decoration knowledge and decoration effect map of fire retardant coatings,