An analysis of the functional characteristics and application of waterproof coating additives.

only 10% of waterproof coating formulations, but they play an extremely important role. Adding additives to waterproof coatings reduces defects in coatings and coatings and facilitates control of the production and construction of waterproof coatings, especially by adding certain additives to improve the function of waterproof coatings. It can be seen that additives are an important part of the production and processing process of waterproof coatings.
1 wetting agent features and application
humidifier can mainly improve the moistureability of pigment particles to water, enhance the stability of pigment dispersion. There are a large number of emulsifiers in the coating, adding moisturizer can significantly increase the content of surfactants. These surfactants can turn coatings into non-stable systems, with poor surface stress leading to foam. Therefore, in recent years, the production and application of low-foam moisturizer has been paid attention to, with the fastest development of elastic coatings. Usually elastic coating requires a thicker dry coating film, not only to form the best decorative effect on the building, but also a strong anti-cracking and leak-proof effect.
2 desmoulation agent functional characteristics and application
the traditional desmodulation agent used in the deblistering substances have water insoluble characteristics, including silicone, mineral oil, hydrophobic inorganic silicone, wax metal soap. Therefore, the right amount of emulsifying agent and extender need to be added in order to de-foam. However, due to some reasons (such as water dilution before coating) cause emulsifying agent from the surface of the deblistering substance, the de-foaming substance insoluble in water will cause shrinkage problems on the surface of the coating film. In order to solve this disadvantage, molecular-grade deboulants have been developed. This new type of desculbicant uses special molecular-grade de-foaming substances and special mineral oil as raw materials, the molecular structure is a mesh branch type, there are multiple anchor points. Due to the existence of a certain self-emulsification effect, there is no need to add other emulsifying agents, there is no emulsifying agent out of the hole caused by the problem. At the same time, due to the particularity of the structure, this kind of desiccant has a certain wetting effect on the substrate, which helps to reduce the amount of moisturizer. The workings of these defoamers and the new defoaming structure may lead to changes in the field of defoamers, which are currently represented by Cognis' FoamStar family.
3 film-assistedfunctional characteristics and applications
film-forming additives belong to a high boiling point solvent, with a very high boiling point, also known as coagulants, polysorbants. After the film is formed, the film-forming additives gradually evaporate over time. Adding it to a waterproof coating reduces the minimum film-forming temperature of the waterproof coating. After the film additive is added to the latex paint, the latex particles gradually soften the surface under the solubility of the additive, so the polymer particles are easily deformed under pressure and gradually fused into a film.
, the commonly used film-forming additives mainly include the following: glycol, propylene glycol, propylene glycol butyl ether, ethylene glycol butyl ether, methamphetamine. In general, the glass transition temperature of latex used in waterproof coatings is low, for example, Tg, VAE emulsion Tg is around -3 degrees C, so when the temperature is greater than 5 degrees C, these emulsions can be successfully filmed. The film-forming additives are added to it, which can speed up the coating film drying process significantly. For example, the use of glycol as a membrane additive, added to the waterproof coating, as the dose increases, the film used to dry solidification time is also reduced. Therefore, for some special waterproofing works, under the premise of ensuring the quality of the project, the amount of membrane additives can be appropriately increased according to the actual needs.
4 thickener features and use of
as a fluidizer, thickener can change the consistency of waterproof coatings, and can make the coating maintain good mechanical and physical chemistry stability. For example, the addition of thickeners in the preparation of color slurry can increase the viscosity of the grinding slurry, thereby strengthening the shearing effect, which is good for the dispersion of pigments. In order to achieve the best waterproof effect, the dry film thickness of waterproof coating is generally between 1.5 and 2.0mm. When the coating has a certain viscosity, to ensure that the thickness of each brush is about 0.5mm. Thickeners include two main categories, inorganic thickeners and organic thickeners. In the cases of inorgic thickeners, nanotechnology enables nano-technology of inorgic particles, thus giving inorgic thickeners some new properties. As far as organic thickeners are concerned, the research and development of polymer thickeners is still the main development direction. At present, the industry commonly used thickeners in addition to inorganic thickeners, there are cellulose ether thickeners, polyacrylate thickeners, compound thickeners three categories. Cellulose ether thickener is the most common one, for example, hydroxyethyl cellulose, which is a powdered non-ion type thickener, with good water solubility and very strong consistency, defects are prone to mold, corruption, poor leveling. Polypropylene esters have good antibacterial and invasive characteristics. There is a significant difference between the thickening agent and other types of thickener, its molecules include the hydro-hydro and oil-friendly parts. The hydro-water-related part is dissolved by water cooperation, and the pro-oil part can be combined with emulsion particles and pigment particles to form a mesh structure.
5 dispersant functional characteristics and the use of
the building's internal and external walls will be eroded by moisture and cause paint film color change, tears and other problems. To this end, the water resistance of the coating film has also received widespread attention. At present, the surface treatment agent used for hydrophobic correction of lacquer film surface has been developed rapidly. Dispersants have similar water-resistant effects, mostly ammonia-based polymers, because ammonia gradually evaporates after filming, adsorbed on the surface of inormerable dispersants will become the original water insoluble form, so that inormeric pigment surface hydrophobicity decreased. This is mainly used in water-resistant systems such as latex paint on the exterior walls. Anionic python dispersant is based on the principle of double electron layer to achieve the dispersion effect of pigment particles in water, but the adsorption effect of pigment particles is very weak, dispersants often separate from the pigment surface, resulting in weak flocculation phenomenon. To this end, by changing the collage, the polymer joining point is added to the pigment surface, which enhances the adsorption force of the dispersant on the pigment particle surface, so that the hydrophobic performance of the pigment surface is better, and the compatible with the emulsion is also effectively improved.
, along with the enhancement of people's environmental awareness, waterproof coating additives not only require to meet the relevant waterproof performance, but also with green, safe, environmental protection characteristics, to meet environmental protection requirements. This has also led to the development of many new green additives..