Silicone resin has excellent thermal oxidation stability, weather resistance, electrical insulation, hydrophobicity and corrosion resistance, and has been widely used in high and low temperature resistant insulating paints, special coatings, adhesives, film plastics, etc. However, at present, silicone resin high and low temperature resistant insulating paints, silicone waterproof coatings and special coatings mainly use organic compounds such as aromatic hydrocarbons and alcohols as solvents, which will generate a large amount of VOC (volatile organic compounds), which will cause great harm to the environment and the human body. Therefore, the water-based silicone resin is the current research focus and development trend.
Water-based silicone resin is a water-based silicone resin emulsion that uses water as a dispersion medium. Currently, it is widely used in silicone-modified coatings, such as silicon-modified acrylic emulsion, silicon-modified polyurethane emulsion, and silicon-modified polyester. Emulsion, etc., the introduction of silicone into the traditional polymer emulsion can enhance its aging resistance, waterproof, high and low temperature resistance, hardening and other properties. In the process of emulsion polymerization, organosilicon links are introduced into the molecular structure of the polymer, and the commonly used organosilicon precursors are silane coupling agents, such as silane coupling agents 171, 560, 570, etc. These silane coupling agents The linking agents are all trifunctional alkoxy groups. In the aqueous system, the alkoxy groups are hydrolyzed into hydroxyl groups, and the hydroxyl groups are further dehydrated and condensed to form a cross-linked structure. When the degree of cross-linking is too large, it will affect the stability of the emulsion and cause gelation. Therefore, the dosage of silane coupling agent is limited. Generally, the dosage is 1%~10%. If the dosage is too small, the modification effect will not be obvious. If the dosage is too large, the stability of the emulsion will be affected. It is determined that the effect of silicon modification is limited or even not obvious.
Furthermore, the silane coupling agent undergoes a hydrolysis reaction in the water phase, and by-produces low-molecular-weight alcohols such as methanol and ethanol, which are flammable and toxic components. For water-based coatings, it is VOC, and VOC is strictly controlled by water-based coatings. Therefore, the water-based coatings modified by silane coupling agents cannot fundamentally solve the problems of low VOC and zero VOC, which will eventually limit the application.

The industrialization of solvent-free pure silicone resin emulsion just solves the above problems. Solvent-free pure silicone resin is pre-hydrolyzed and condensed into solid silicone resin by silane coupling agent. The alcohols are released, and then a special emulsification process is used to uniformly disperse the solid silicone resin in water to form a stable emulsion. Solvent-free pure silicone resin avoids the introduction of solvents and the release of by-product solvents, and fundamentally achieves green environmental protection and zero VOC.

In terms of application, solvent-free pure silicone resin emulsion can be mixed with acrylic emulsion, polyurethane emulsion, polyester emulsion, alkyd resin emulsion, fluorocarbon emulsion, wax emulsion and other emulsions in any proportion, no special production process is required, as long as the dispersion is uniform It can be used immediately without causing gelation or demulsification. The infinite introduction of silicone components can maximize the performance of silicone. It can formulate both modified silicone coatings and modified silicone coatings, fully taking into account the performance of both. .

Solvent-free pure silicone resin emulsion can also be used directly as varnish, and can be used directly in occasions with high transparency requirements, such as wood lacquer. Emulsion and polyurethane emulsion have higher hardness, water resistance and anti-fouling properties, and have been successfully used in waterproof protection of concrete, stone, rock wool, clay, wood, paper, cultural relics, metal, etc., as well as water-in-water (sand), real stone paint, etc. Exterior wall covering.

Solvent-free pure silicone resin emulsion retains various properties of solvent-based silicone resin, and can also formulate special functional coatings, such as silicone heat-resistant coatings, silicone weather-resistant coatings, silicone insulating coatings, silicone elastic coatings, and silicone waterproof coatings Etc., for today's increasingly high environmental protection requirements, water-based special functional coatings undoubtedly have a broader space for development.

Solvent-free pure silicone resin emulsion can be cured at room temperature or by heating. It can be made into a two-component system or a one-component system, which can be used directly or in combination. Health, environmental protection, greenness and high efficiency are a great innovation of water-based coatings. Solvent-free pure silicone resin emulsion has promoted the rapid development of water-based coatings. It can be said without modesty that water-based coatings have ushered in the era of water-based silicone resins!