Common knowledge of coating: methods and precautions for hydrophilic coating

The following methods can be used to achieve hydrophilic coating (1) Nano anatase titanium dioxide nano anatase Ti02 can make the contact angle of the film lower than 40 °, but because of the photocatalytic effect of this kind of Ti02, the organic components of the film will be decomposed, and then the film will lose light and powder A Japanese company uses inorganic binder for bonding After the modified organic film-forming material is completely decomposed, its contact angle can be close to 0 ° and the pollutants attached to the film can be decomposed at the same time Due to inorganic binder Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Paint Home News: the following methods can be used to achieve hydrophilic coating (1) Nano anatase titanium dioxide nano anatase Ti02 can make the contact angle of the film lower than 40 °, but because of the photocatalytic effect of this kind of Ti02, the organic components of the film will be decomposed, and then the film will lose light and powder A Japanese company uses inorganic binder for bonding After the modified organic film-forming material is completely decomposed, its contact angle can be close to 0 ° and the pollutants attached to the film can be decomposed at the same time Because inorganic binder can't be waterproof, the middle coating is required to be thick In addition, organic color paste can't be used in this kind of coating, otherwise the color of the coating will gradually become lighter, and finally it will be white (2) organic silica sol organosilicon sol is a sol-gel method from ethyl silicate, and then modified transparent colloid with a particle size of 10 to l00nm The solid content is generally between 20% and 30% It can be used as a modified material for coating film It has a certain hydrophilicity, but it can not form a film, and the excessive dosage will affect the water resistance of the coating Some formulas use the hydrophilic agent and some other hydrophilic additives to reduce the cost of hydrophilization Nipponpaints company and Mitsubishi Chemical Company in Japan, while adopting the aforementioned silicic ester hydrophilic additives, also mixed with organic silica sol (particle size of 10-100nm) to improve the hydrophilicity (3) Graft or block hydrophilic chain segment graft hydrophilic group or polymer on the side chain of the main resin, such as sulfonic acid group and amide group, also graft polyoxyethylene chain segment, or block copolymerize polyoxyethylene chain segment and other resins, all of which can realize resin hydrophilicity In addition, core-shell technology can also be used to introduce hydrophilic groups into the shell to achieve hydrophilic purpose However, due to the hydrophobicity of the resin, especially when PVC is lower than CPVC, or when varnish is prepared, the rainwater still flows in a line shape, and even water drops will hang (4) non reactive hydrophilic auxiliaries are non reactive hydrophilic auxiliaries Block type non-ionic polymers are generally used The system of such auxiliaries requires high emulsion content It is suggested that the crosslinking emulsion system should be used, because the water resistance of the coating will be reduced after adding hydrophilic additives, and the water resistance can be improved by crosslinking The hydrophilic additives only exhibit a low contact angle when the humidity is high Under the condition of 55% humidity, the contact angle is still large, which will seriously affect the water resistance of the emulsion in most cases At the same time, because this kind of hydrophilic agent is easy to wash out from the film together with rainwater, it is difficult to maintain a longer hydrophilic performance In addition, the non reactive hydrophilic additives make the whole film hydrophilic, so it will lead to the improvement of the water permeability of the film, and affect the protective effect of the film on the substrate At present, studies have shown that if the hydrophilic component is grafted on the polymer and the polymer is used as hydrophilic aid and film-forming material, the problem of free hydrophilic aid can be solved well Attention should be paid to the hydrophilicity of the coating Adding hydrophilic agent into the coating is not suitable for coating or non crosslinking emulsion with less film forming material, because hydrophilicity will affect the water resistance of the coating In addition, the low contact angle causes the film to be very hydrophilic, which may affect the water resistance of the film, and the film will turn white when encountering water; when recoating, it is easy to peel, because of rain, the rain will permeate the coating, because of water absorption, the water will accumulate on the old hydrophilic coating, and finally the film will fall off Too low contact angle will also cause the film to be wet for a long time due to water absorption, and mould will grow, so the stain resistance of the film will become poor In a word, in order to obtain the film with long-term excellent stain resistance and rainmark prevention, the hardness, crosslinking degree and water resistance of the film should be considered comprehensively 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,