Types of Organic Silicon Building Waterproofing Agents
Sep 30, 2024
The advantages of sodium methylsilicate building waterproofing agent are its low price and easy use. The disadvantage is that it reacts slowly with carbon dioxide and takes 24 hours to solidify. Due to the fact that the applied waterproofing agent remains water-soluble for a certain period of time, it is easily washed away by rainwater. In addition, sodium methylsilicate will produce yellow rust spots on limestone and marble containing iron salts, so it cannot be used to treat marble containing iron salts, nor can it be used to further treat materials that already have water repellency. In these cases, only solvent based silicone building waterproofing agents can be used.
Solvent based organic silicon building waterproofing agent
Solution type organic silicon waterproof and moisture-proof coating is a partially condensed silicone resin solution, and its hydrophobic film is obtained by solvent evaporation, so its activity is relatively less affected by external factors. There are currently two types of solvent based organic silicon building waterproofing agents.
Polyethylene triethoxysilane solvent based building waterproofing agent
Polymethyl triethoxysilane resin is neutral and must be used with alcohol as a solvent. When applied to the surface of the substrate, the solvent quickly evaporates, so a very thin film is deposited on the capillary pores of the brick and stone. This film is colorless, dull, and non sticky, appearing as if nothing has been coated.
The chemical properties of silanol based compounds are very active. They react chemically with free shin groups naturally present on the surface of concrete and masonry (which are essentially silicate materials, so these free shin grous can also be considered silanol based compounds). The two molecules are connected by a chemical bond through water shrinkage, resulting in a light solvent based organic silicon building waterproofing agent with water repellent properties on the surface of masonry. It is much less affected by external factors than sodium methylsilicate, and therefore has a wider range of applications and better waterproofing effects.
Acrylic modified organic silicon building waterproofing agent
It is a silane based coating with acrylic macromolecules as the main chain and side chains containing oxygen groups (OR) or hydroxyl groups (OH). This coating combines the advantages of acrylic and silicone coatings, with features such as super weather resistance, good coating adhesion, excellent water resistance, full paint film, and the ability to cure at normal temperatures.
Lotion organosilicon building waterproof agent
There are two types of lotion building waterproof agent: one is pure silicone silicone emulsion, which is prepared by lotion polymerization of silicone tetracycline; Another type is latex paint made from a mixture of acrylic modified organosilicon latex and acrylic latex.
Acrylic silicone lotion building waterproof agent
Through lotion polymerization, a certain amount of organosilicon functional groups are introduced into the macromolecular side chain of acrylic acid, and S! - The bond energy of Si is C443kJ/mo, It is stable to heat and light, and does not accept the effect of ultraviolet light and aging. It improves the weather resistance of acrylic resin coating, and also improves the water resistance and salt water resistance. It has a great progressiveness in technology. Acrylic modified silicone building waterproof coating has excellent water resistance and weather resistance, especially in water resistance and salt water resistance, it has exceeded pure acrylic acid, and even styrene acrylic coating, becoming a new and widely used important variety of building waterproof coating.
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